Mercurial Hosting > luan
annotate core/src/luan/impl/LuanParser.java @ 186:cf939124461a
don't import modules by default
git-svn-id: https://luan-java.googlecode.com/svn/trunk@187 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Thu, 26 Jun 2014 00:36:50 +0000 |
parents | 5d2cb8c1f844 |
children | 04b86428dc50 |
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166
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1 package luan.impl; |
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2 |
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3 import java.util.Set; |
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4 import java.util.HashSet; |
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5 import java.util.Arrays; |
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6 import java.util.List; |
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7 import java.util.ArrayList; |
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8 import java.util.Scanner; |
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9 import luan.Luan; |
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10 import luan.LuanState; |
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11 import luan.LuanSource; |
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12 import luan.modules.PackageLuan; |
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13 |
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14 |
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15 final class LuanParser { |
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16 |
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17 private static final class Frame { |
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18 final Frame parent; |
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19 final List<String> symbols = new ArrayList<String>(); |
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20 int stackSize = 0; |
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21 int loops = 0; |
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22 boolean isVarArg = false; |
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23 final List<String> upValueSymbols = new ArrayList<String>(); |
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24 final List<UpValue.Getter> upValueGetters = new ArrayList<UpValue.Getter>(); |
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25 |
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26 Frame(UpValue.Getter envGetter) { |
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27 this.parent = null; |
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28 upValueSymbols.add(_ENV); |
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29 upValueGetters.add(envGetter); |
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30 } |
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31 |
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32 Frame(Frame parent) { |
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33 this.parent = parent; |
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34 if( upValueIndex(_ENV) != 0 ) |
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35 throw new RuntimeException(); |
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36 } |
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37 |
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38 int stackIndex(String name) { |
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39 int i = symbols.size(); |
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40 while( --i >= 0 ) { |
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41 if( symbols.get(i).equals(name) ) |
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42 return i; |
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43 } |
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44 return -1; |
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45 } |
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46 |
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47 int upValueIndex(String name) { |
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48 int i = upValueSymbols.size(); |
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49 while( --i >= 0 ) { |
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50 if( upValueSymbols.get(i).equals(name) ) |
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51 return i; |
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52 } |
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53 if( parent==null ) |
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54 return -1; |
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55 i = parent.stackIndex(name); |
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56 if( i != -1 ) { |
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57 upValueGetters.add(new UpValue.StackGetter(i)); |
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58 } else { |
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59 i = parent.upValueIndex(name); |
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60 if( i == -1 ) |
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61 return -1; |
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62 upValueGetters.add(new UpValue.NestedGetter(i)); |
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63 } |
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64 upValueSymbols.add(name); |
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65 return upValueSymbols.size() - 1; |
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66 } |
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67 |
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68 void addUpValueGetter(String name,UpValue.Getter upValueGetter) { |
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69 upValueSymbols.add(name); |
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70 upValueGetters.add(upValueGetter); |
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71 } |
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72 } |
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73 |
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74 private static class In { |
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75 static final In NOTHING = new In(false,false); |
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76 |
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77 final boolean parens; |
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78 final boolean template; |
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79 |
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80 private In(boolean parens,boolean template) { |
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81 this.parens = parens; |
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82 this.template = template; |
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83 } |
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84 |
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85 In parens() { |
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86 return parens ? this : new In(true,template); |
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87 } |
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88 |
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89 In template() { |
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90 return template ? this : new In(parens,true); |
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91 } |
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92 } |
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93 |
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94 private static final String _ENV = "_ENV"; |
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95 private static final UpValue.Getter[] NO_UP_VALUE_GETTERS = new UpValue.Getter[0]; |
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96 |
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97 final LuanSource source; |
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98 private Frame frame; |
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99 private final Parser parser; |
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100 private final boolean interactive; |
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101 |
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102 LuanParser(LuanSource source,UpValue.Getter envGetter) { |
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103 this.source = source; |
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104 this.frame = new Frame(envGetter); |
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105 this.parser = new Parser(source); |
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106 this.interactive = envGetter instanceof UpValue.ValueGetter; |
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107 } |
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108 |
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109 void addVar(String name,Object value) { |
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110 frame.addUpValueGetter(name,new UpValue.ValueGetter(value)); |
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111 } |
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112 |
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113 private LuanSource.Element se(int start) { |
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114 return new LuanSource.Element(source,start,parser.currentIndex()); |
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115 } |
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116 |
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117 private List<String> symbols() { |
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118 return frame.symbols; |
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119 } |
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120 |
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121 private int symbolsSize() { |
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122 return frame.symbols.size(); |
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123 } |
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124 |
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125 private void addSymbol(String name) { |
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126 frame.symbols.add(name); |
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127 if( frame.stackSize < symbolsSize() ) |
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128 frame.stackSize = symbolsSize(); |
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129 } |
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130 |
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131 private void addSymbols(List<String> names) { |
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132 frame.symbols.addAll(names); |
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133 if( frame.stackSize < symbolsSize() ) |
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134 frame.stackSize = symbolsSize(); |
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135 } |
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136 |
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137 private int stackIndex(String name) { |
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138 return frame.stackIndex(name); |
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139 } |
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140 |
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141 private void popSymbols(int n) { |
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142 List<String> symbols = frame.symbols; |
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143 while( n-- > 0 ) { |
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144 symbols.remove(symbols.size()-1); |
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145 } |
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146 } |
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147 |
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148 private int upValueIndex(String name) { |
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149 return frame.upValueIndex(name); |
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150 } |
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151 |
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152 private void incLoops() { |
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153 frame.loops++; |
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154 } |
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155 |
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156 private void decLoops() { |
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157 frame.loops--; |
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158 } |
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159 |
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160 private <T> T required(T t) throws ParseException { |
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161 if( t==null ) |
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162 throw parser.exception(); |
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163 return t; |
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164 } |
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165 |
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166 private <T> T required(T t,String msg) throws ParseException { |
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167 if( t==null ) |
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168 throw parser.exception(msg); |
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169 return t; |
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170 } |
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171 |
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172 private static Expr expr(Expressions exprs) { |
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173 if( exprs instanceof Expr ) |
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174 return (Expr)exprs; |
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175 return new ExpressionsExpr(exprs); |
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176 } |
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177 |
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178 private FnDef newFnDef(int start,Stmt stmt) { |
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179 return new FnDef( se(start), stmt, frame.stackSize, symbolsSize(), frame.isVarArg, frame.upValueGetters.toArray(NO_UP_VALUE_GETTERS) ); |
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180 } |
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181 |
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182 FnDef Expression() throws ParseException { |
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183 Spaces(In.NOTHING); |
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184 int start = parser.begin(); |
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185 Expressions expr = Expr(In.NOTHING); |
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186 if( expr != null && parser.endOfInput() ) { |
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187 Stmt stmt = new ReturnStmt( se(start), expr ); |
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188 return parser.success(newFnDef(start,stmt)); |
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189 } |
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190 return parser.failure(null); |
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191 } |
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192 |
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193 FnDef RequiredModule() throws ParseException { |
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194 Spaces(In.NOTHING); |
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195 int start = parser.begin(); |
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196 frame.isVarArg = true; |
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197 Stmt stmt = RequiredBlock(); |
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198 if( parser.endOfInput() ) |
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199 return parser.success(newFnDef(start,stmt)); |
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200 throw parser.exception(); |
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201 } |
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202 |
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203 private Stmt RequiredBlock() throws ParseException { |
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204 List<Stmt> stmts = new ArrayList<Stmt>(); |
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205 int stackStart = symbolsSize(); |
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206 Stmt(stmts); |
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207 while( StmtSep(stmts) ) { |
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208 Spaces(In.NOTHING); |
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209 Stmt(stmts); |
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210 } |
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211 int stackEnd = symbolsSize(); |
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212 popSymbols( stackEnd - stackStart ); |
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213 if( stmts.isEmpty() ) |
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214 return Stmt.EMPTY; |
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215 if( stmts.size()==1 && stackStart==stackEnd ) |
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216 return stmts.get(0); |
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217 return new Block( stmts.toArray(new Stmt[0]), stackStart, stackEnd ); |
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218 } |
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219 |
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220 private boolean StmtSep(List<Stmt> stmts) throws ParseException { |
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221 parser.begin(); |
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222 if( parser.match( ';' ) ) |
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223 return parser.success(); |
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224 if( parser.match( "--" ) ) { |
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225 while( parser.noneOf("\r\n") ); |
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226 } |
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227 if( EndOfLine() ) |
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228 return parser.success(); |
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229 parser.rollback(); |
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230 Stmt stmt = TemplateStmt(); |
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231 if( stmt != null ) { |
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232 stmts.add(stmt); |
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233 return parser.success(); |
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234 } |
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235 return parser.failure(); |
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236 } |
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237 |
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238 private boolean EndOfLine() { |
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239 return parser.match( "\r\n" ) || parser.match( '\r' ) || parser.match( '\n' ); |
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240 } |
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241 |
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242 private void Stmt(List<Stmt> stmts) throws ParseException { |
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243 if( LocalStmt(stmts) ) |
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244 return; |
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245 Stmt stmt; |
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246 if( (stmt=ReturnStmt()) != null |
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247 || (stmt=FunctionStmt()) != null |
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248 || (stmt=LocalFunctionStmt()) != null |
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249 || (stmt=ImportStmt()) != null |
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250 || (stmt=BreakStmt()) != null |
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251 || (stmt=ForStmt()) != null |
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252 || (stmt=TryStmt()) != null |
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253 || (stmt=DoStmt()) != null |
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254 || (stmt=WhileStmt()) != null |
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255 || (stmt=FunctionStmt()) != null |
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256 || (stmt=RepeatStmt()) != null |
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257 || (stmt=IfStmt()) != null |
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258 || (stmt=SetStmt()) != null |
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259 || (stmt=ExpressionsStmt()) != null |
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260 ) { |
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261 stmts.add(stmt); |
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262 } |
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263 } |
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264 |
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265 private Stmt TemplateStmt() throws ParseException { |
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266 int start = parser.currentIndex(); |
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267 Expressions exp = TemplateExpressions(In.NOTHING); |
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268 if( exp == null ) |
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269 return null; |
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270 Expr fnExp = (Expr)nameVar(start,"Io").expr(); |
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271 fnExp = new IndexExpr( se(start), fnExp, new ConstExpr("stdout") ); |
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272 fnExp = new IndexExpr( se(start), fnExp, new ConstExpr("write") ); |
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273 FnCall fnCall = new FnCall( se(start), fnExp, exp ); |
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274 return new ExpressionsStmt(fnCall); |
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275 } |
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276 |
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277 private Expressions TemplateExpressions(In in) throws ParseException { |
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278 if( in.template ) |
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279 return null; |
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280 int start = parser.begin(); |
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281 if( !parser.match( "%>" ) ) |
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282 return parser.failure(null); |
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283 EndOfLine(); |
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284 In inTemplate = in.template(); |
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285 List<Expressions> builder = new ArrayList<Expressions>(); |
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286 while(true) { |
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287 if( parser.match( "<%=" ) ) { |
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288 Spaces(inTemplate); |
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289 builder.add( RequiredExpr(inTemplate) ); |
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290 RequiredMatch( "%>" ); |
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291 } else if( parser.match( "<%" ) ) { |
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292 Spaces(inTemplate); |
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293 return parser.success(ExpList.build(builder)); |
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294 } else { |
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295 int i = parser.currentIndex(); |
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296 do { |
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297 if( parser.match( "%>" ) ) |
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298 throw parser.exception("'%>' unexpected"); |
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299 if( !parser.anyChar() ) |
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300 throw parser.exception("Unclosed template expression"); |
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301 } while( !parser.test( "<%" ) ); |
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302 String match = parser.textFrom(i); |
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303 builder.add( new ConstExpr(match) ); |
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304 } |
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305 } |
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306 } |
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307 |
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308 private Stmt ReturnStmt() throws ParseException { |
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309 int start = parser.begin(); |
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310 if( !Keyword("return",In.NOTHING) ) |
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311 return parser.failure(null); |
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312 Expressions exprs = ExpList(In.NOTHING); |
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313 if( exprs==null ) |
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314 exprs = ExpList.emptyExpList; |
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315 return parser.success( new ReturnStmt(se(start),exprs) ); |
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316 } |
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317 |
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318 private Stmt FunctionStmt() throws ParseException { |
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319 parser.begin(); |
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320 if( !Keyword("function",In.NOTHING) ) |
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321 return parser.failure(null); |
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322 |
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323 int start = parser.currentIndex(); |
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324 Var var = nameVar(start,RequiredName(In.NOTHING)); |
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325 while( parser.match( '.' ) ) { |
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326 Spaces(In.NOTHING); |
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327 var = indexVar( start, expr(var.expr()), NameExpr(In.NOTHING) ); |
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328 } |
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329 Settable fnName = var.settable(); |
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330 |
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331 FnDef fnDef = RequiredFunction(In.NOTHING); |
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332 return parser.success( new SetStmt(fnName,fnDef) ); |
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333 } |
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334 |
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335 private Stmt LocalFunctionStmt() throws ParseException { |
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336 parser.begin(); |
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337 if( !(Keyword("local",In.NOTHING) && Keyword("function",In.NOTHING)) ) |
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338 return parser.failure(null); |
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339 String name = RequiredName(In.NOTHING); |
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340 addSymbol( name ); |
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341 FnDef fnDef = RequiredFunction(In.NOTHING); |
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342 return parser.success( new SetStmt( new SetLocalVar(symbolsSize()-1), fnDef ) ); |
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343 } |
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344 |
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345 private Stmt ImportStmt() throws ParseException { |
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346 int start = parser.begin(); |
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347 if( !Keyword("import",In.NOTHING) ) |
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348 return parser.failure(null); |
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349 String modName = StringLiteral(In.NOTHING); |
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350 if( modName==null ) |
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351 return parser.failure(null); |
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352 int i = modName.lastIndexOf('/'); |
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353 if( i == -1 ) |
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354 i = modName.lastIndexOf('.'); |
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355 String varName = modName.substring(i+1); |
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356 if( !isValidName(varName) ) |
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357 throw parser.exception("invalid variable name '"+varName+"' in import"); |
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358 LuanSource.Element se = se(start); |
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359 FnCall require = new FnCall( se, new ConstExpr(se,PackageLuan.requireFn), new ConstExpr(modName) ); |
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360 Settable settable; |
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361 if( interactive ) { |
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362 settable = nameVar(se,varName).settable(); |
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363 } else { |
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364 addSymbol( varName ); |
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365 settable = new SetLocalVar(symbolsSize()-1); |
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366 } |
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367 return parser.success( new SetStmt( settable, expr(require) ) ); |
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368 } |
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369 |
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370 private boolean isValidName(String s) { |
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371 if( s.length() == 0 ) |
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372 return false; |
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373 char c = s.charAt(0); |
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374 if( !('a'<=c && c<='z' || 'A'<=c && c<='Z' || c=='_') ) |
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375 return false; |
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376 for( int i=1; i<s.length() ; i++ ) { |
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377 if( !('a'<=c && c<='z' || 'A'<=c && c<='Z' || c=='_' || '0'<=c && c<='9') ) |
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378 return false; |
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379 } |
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380 return true; |
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381 } |
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382 |
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383 private Stmt BreakStmt() throws ParseException { |
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384 parser.begin(); |
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385 if( !Keyword("break",In.NOTHING) ) |
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386 return parser.failure(null); |
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387 if( frame.loops <= 0 ) |
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388 throw parser.exception("'break' outside of loop"); |
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389 return parser.success( new BreakStmt() ); |
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390 } |
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391 |
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392 private Stmt ForStmt() throws ParseException { |
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393 int start = parser.begin(); |
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394 int stackStart = symbolsSize(); |
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395 if( !Keyword("for",In.NOTHING) ) |
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396 return parser.failure(null); |
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397 List<String> names = RequiredNameList(In.NOTHING); |
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398 if( !Keyword("in",In.NOTHING) ) |
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399 return parser.failure(null); |
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400 Expr expr = expr(RequiredExpr(In.NOTHING)); |
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401 RequiredKeyword("do",In.NOTHING); |
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402 addSymbols(names); |
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403 Stmt loop = RequiredLoopBlock(); |
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404 RequiredKeyword("end",In.NOTHING); |
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405 Stmt stmt = new ForStmt( se(start), stackStart, symbolsSize() - stackStart, expr, loop ); |
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406 popSymbols( symbolsSize() - stackStart ); |
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407 return parser.success(stmt); |
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408 } |
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409 |
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410 private Stmt TryStmt() throws ParseException { |
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411 parser.begin(); |
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412 if( !Keyword("try",In.NOTHING) ) |
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413 return parser.failure(null); |
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414 Stmt tryBlock = RequiredBlock(); |
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415 RequiredKeyword("catch",In.NOTHING); |
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416 String name = RequiredName(In.NOTHING); |
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417 addSymbol(name); |
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418 RequiredKeyword("do",In.NOTHING); |
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419 Stmt catchBlock = RequiredBlock(); |
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420 RequiredKeyword("end",In.NOTHING); |
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421 Stmt stmt = new TryStmt( tryBlock, symbolsSize()-1, catchBlock ); |
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422 popSymbols(1); |
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423 return parser.success(stmt); |
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424 } |
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425 |
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426 private Stmt DoStmt() throws ParseException { |
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427 parser.begin(); |
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428 if( !Keyword("do",In.NOTHING) ) |
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429 return parser.failure(null); |
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430 Stmt stmt = RequiredBlock(); |
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431 RequiredKeyword("end",In.NOTHING); |
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432 return parser.success(stmt); |
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433 } |
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434 |
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435 private boolean LocalStmt(List<Stmt> stmts) throws ParseException { |
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436 parser.begin(); |
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437 if( !Keyword("local",In.NOTHING) ) |
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438 return parser.failure(); |
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439 List<String> names = NameList(In.NOTHING); |
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440 if( names==null ) |
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441 return parser.failure(); |
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442 if( parser.match( '=' ) ) { |
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443 Spaces(In.NOTHING); |
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444 Expressions values = ExpList(In.NOTHING); |
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445 if( values==null ) |
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446 throw parser.exception("Expressions expected"); |
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447 SetLocalVar[] vars = new SetLocalVar[names.size()]; |
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448 int stackStart = symbolsSize(); |
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449 for( int i=0; i<vars.length; i++ ) { |
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450 vars[i] = new SetLocalVar(stackStart+i); |
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451 } |
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452 stmts.add( new SetStmt( vars, values ) ); |
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453 } |
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454 addSymbols(names); |
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455 return parser.success(); |
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456 } |
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457 |
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458 private List<String> RequiredNameList(In in) throws ParseException { |
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459 parser.begin(); |
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460 List<String> names = NameList(in); |
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461 if( names==null ) |
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462 throw parser.exception("Name expected"); |
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463 return parser.success(names); |
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464 } |
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465 |
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466 private List<String> NameList(In in) throws ParseException { |
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467 String name = Name(in); |
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468 if( name==null ) |
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469 return null; |
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470 List<String> names = new ArrayList<String>(); |
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471 names.add(name); |
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472 while( (name=anotherName(in)) != null ) { |
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473 names.add(name); |
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474 } |
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475 return names; |
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476 } |
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477 |
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478 private String anotherName(In in) throws ParseException { |
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479 parser.begin(); |
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480 if( !parser.match( ',' ) ) |
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481 return parser.failure(null); |
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482 Spaces(in); |
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483 String name = Name(in); |
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484 if( name==null ) |
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485 return parser.failure(null); |
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486 return parser.success(name); |
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487 } |
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488 |
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489 private Stmt WhileStmt() throws ParseException { |
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490 int start = parser.begin(); |
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491 if( !Keyword("while",In.NOTHING) ) |
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492 return parser.failure(null); |
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493 Expr cnd = expr(RequiredExpr(In.NOTHING)); |
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494 RequiredKeyword("do",In.NOTHING); |
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495 Stmt loop = RequiredLoopBlock(); |
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496 RequiredKeyword("end",In.NOTHING); |
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497 return parser.success( new WhileStmt(se(start),cnd,loop) ); |
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498 } |
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499 |
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500 private Stmt RepeatStmt() throws ParseException { |
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501 int start = parser.begin(); |
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502 if( !Keyword("repeat",In.NOTHING) ) |
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503 return parser.failure(null); |
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504 Stmt loop = RequiredLoopBlock(); |
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505 RequiredKeyword("until",In.NOTHING); |
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506 Expr cnd = expr(RequiredExpr(In.NOTHING)); |
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507 return parser.success( new RepeatStmt(se(start),loop,cnd) ); |
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508 } |
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509 |
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510 private Stmt RequiredLoopBlock() throws ParseException { |
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511 incLoops(); |
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512 Stmt stmt = RequiredBlock(); |
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513 decLoops(); |
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514 return stmt; |
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515 } |
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516 |
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517 private Stmt IfStmt() throws ParseException { |
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518 parser.begin(); |
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519 if( !Keyword("if",In.NOTHING) ) |
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520 return parser.failure(null); |
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521 return parser.success( IfStmt2() ); |
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522 } |
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523 |
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524 private Stmt IfStmt2() throws ParseException { |
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525 int start = parser.currentIndex(); |
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526 Expr cnd = expr(RequiredExpr(In.NOTHING)); |
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527 RequiredKeyword("then",In.NOTHING); |
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528 Stmt thenBlock = RequiredBlock(); |
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529 Stmt elseBlock; |
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530 if( Keyword("elseif",In.NOTHING) ) { |
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531 elseBlock = IfStmt2(); |
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532 } else { |
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533 elseBlock = Keyword("else",In.NOTHING) ? RequiredBlock() : Stmt.EMPTY; |
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534 RequiredKeyword("end",In.NOTHING); |
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535 } |
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536 return new IfStmt(se(start),cnd,thenBlock,elseBlock); |
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537 } |
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538 |
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539 private Stmt SetStmt() throws ParseException { |
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540 parser.begin(); |
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541 List<Settable> vars = new ArrayList<Settable>(); |
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542 Settable s = SettableVar(); |
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543 if( s == null ) |
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544 return parser.failure(null); |
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545 vars.add(s); |
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546 while( parser.match( ',' ) ) { |
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547 Spaces(In.NOTHING); |
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548 s = SettableVar(); |
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549 if( s == null ) |
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550 return parser.failure(null); |
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551 vars.add(s); |
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552 } |
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553 if( !parser.match( '=' ) ) |
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554 return parser.failure(null); |
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555 Spaces(In.NOTHING); |
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556 Expressions values = ExpList(In.NOTHING); |
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557 if( values==null ) |
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558 throw parser.exception("Expressions expected"); |
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559 return parser.success( new SetStmt( vars.toArray(new Settable[0]), values ) ); |
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560 } |
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561 |
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562 private Stmt ExpressionsStmt() throws ParseException { |
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563 parser.begin(); |
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564 Expressions exp = Expr(In.NOTHING); |
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565 if( exp instanceof FnCall || exp instanceof AndExpr || exp instanceof OrExpr ) |
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566 return parser.success( new ExpressionsStmt(exp) ); |
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567 return parser.failure(null); |
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568 } |
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569 |
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570 private Settable SettableVar() throws ParseException { |
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571 int start = parser.begin(); |
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572 Var var = VarZ(In.NOTHING); |
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573 if( var==null ) |
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574 return parser.failure(null); |
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575 return parser.success( var.settable() ); |
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576 } |
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577 |
154
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578 private Expressions RequiredExpr(In in) throws ParseException { |
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579 parser.begin(); |
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580 return parser.success(required(Expr(in),"Bad expression")); |
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581 } |
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582 |
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583 private Expressions Expr(In in) throws ParseException { |
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584 parser.begin(); |
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585 Expressions exp; |
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586 return (exp = VarArgs(in)) != null |
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587 || (exp = OrExpr(in)) != null |
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588 ? parser.success(exp) |
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589 : parser.failure((Expressions)null) |
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590 ; |
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591 } |
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592 |
154
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593 private Expressions OrExpr(In in) throws ParseException { |
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594 int start = parser.begin(); |
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595 Expressions exp = AndExpr(in); |
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596 if( exp==null ) |
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597 return parser.failure(null); |
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598 while( Keyword("or",in) ) { |
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599 exp = new OrExpr( se(start), expr(exp), required(expr(AndExpr(in))) ); |
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600 } |
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601 return parser.success(exp); |
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602 } |
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603 |
154
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604 private Expressions AndExpr(In in) throws ParseException { |
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605 int start = parser.begin(); |
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606 Expressions exp = RelExpr(in); |
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607 if( exp==null ) |
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608 return parser.failure(null); |
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609 while( Keyword("and",in) ) { |
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610 exp = new AndExpr( se(start), expr(exp), required(expr(RelExpr(in))) ); |
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611 } |
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612 return parser.success(exp); |
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613 } |
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614 |
154
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615 private Expressions RelExpr(In in) throws ParseException { |
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616 int start = parser.begin(); |
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617 Expressions exp = ConcatExpr(in); |
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618 if( exp==null ) |
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619 return parser.failure(null); |
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620 while(true) { |
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621 if( parser.match("==") ) { |
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622 Spaces(in); |
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623 exp = new EqExpr( se(start), expr(exp), required(expr(ConcatExpr(in))) ); |
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624 } else if( parser.match("~=") ) { |
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625 Spaces(in); |
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626 exp = new NotExpr( se(start), new EqExpr( se(start), expr(exp), required(expr(ConcatExpr(in))) ) ); |
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627 } else if( parser.match("<=") ) { |
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628 Spaces(in); |
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629 exp = new LeExpr( se(start), expr(exp), required(expr(ConcatExpr(in))) ); |
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630 } else if( parser.match(">=") ) { |
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631 Spaces(in); |
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632 exp = new LeExpr( se(start), required(expr(ConcatExpr(in))), expr(exp) ); |
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633 } else if( parser.match("<") ) { |
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634 Spaces(in); |
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635 exp = new LtExpr( se(start), expr(exp), required(expr(ConcatExpr(in))) ); |
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636 } else if( parser.match(">") ) { |
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637 Spaces(in); |
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638 exp = new LtExpr( se(start), required(expr(ConcatExpr(in))), expr(exp) ); |
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639 } else |
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640 break; |
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641 } |
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642 return parser.success(exp); |
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643 } |
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644 |
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645 private Expressions ConcatExpr(In in) throws ParseException { |
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646 int start = parser.begin(); |
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647 Expressions exp = SumExpr(in); |
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648 if( exp==null ) |
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649 return parser.failure(null); |
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650 if( parser.match("..") ) { |
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651 Spaces(in); |
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652 exp = new ConcatExpr( se(start), expr(exp), required(expr(ConcatExpr(in))) ); |
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653 } |
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654 return parser.success(exp); |
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655 } |
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656 |
154
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657 private Expressions SumExpr(In in) throws ParseException { |
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658 int start = parser.begin(); |
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659 Expressions exp = TermExpr(in); |
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660 if( exp==null ) |
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661 return parser.failure(null); |
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662 while(true) { |
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663 if( parser.match('+') ) { |
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664 Spaces(in); |
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665 exp = new AddExpr( se(start), expr(exp), required(expr(TermExpr(in))) ); |
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666 } else if( Minus() ) { |
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667 Spaces(in); |
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668 exp = new SubExpr( se(start), expr(exp), required(expr(TermExpr(in))) ); |
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669 } else |
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670 break; |
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671 } |
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672 return parser.success(exp); |
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673 } |
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674 |
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675 private boolean Minus() { |
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676 parser.begin(); |
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677 return parser.match('-') && !parser.match('-') ? parser.success() : parser.failure(); |
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678 } |
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679 |
154
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680 private Expressions TermExpr(In in) throws ParseException { |
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681 int start = parser.begin(); |
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682 Expressions exp = UnaryExpr(in); |
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683 if( exp==null ) |
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684 return parser.failure(null); |
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685 while(true) { |
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686 if( parser.match('*') ) { |
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687 Spaces(in); |
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688 exp = new MulExpr( se(start), expr(exp), required(expr(UnaryExpr(in))) ); |
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689 } else if( parser.match('/') ) { |
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690 Spaces(in); |
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691 exp = new DivExpr( se(start), expr(exp), required(expr(UnaryExpr(in))) ); |
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692 } else if( Mod() ) { |
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693 Spaces(in); |
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694 exp = new ModExpr( se(start), expr(exp), required(expr(UnaryExpr(in))) ); |
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695 } else |
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696 break; |
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697 } |
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698 return parser.success(exp); |
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699 } |
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700 |
107
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701 private boolean Mod() { |
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702 parser.begin(); |
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703 return parser.match('%') && !parser.match('>') ? parser.success() : parser.failure(); |
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704 } |
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705 |
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706 private Expressions UnaryExpr(In in) throws ParseException { |
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707 int start = parser.begin(); |
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708 if( parser.match('#') ) { |
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709 Spaces(in); |
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710 return parser.success( new LenExpr( se(start), required(expr(UnaryExpr(in))) ) ); |
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711 } |
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712 if( Minus() ) { |
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713 Spaces(in); |
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714 return parser.success( new UnmExpr( se(start), required(expr(UnaryExpr(in))) ) ); |
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715 } |
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716 if( Keyword("not",in) ) { |
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717 Spaces(in); |
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718 return parser.success( new NotExpr( se(start), required(expr(UnaryExpr(in))) ) ); |
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719 } |
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720 Expressions exp = PowExpr(in); |
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721 if( exp==null ) |
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722 return parser.failure(null); |
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723 return parser.success(exp); |
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724 } |
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725 |
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726 private Expressions PowExpr(In in) throws ParseException { |
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727 int start = parser.begin(); |
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728 Expressions exp = SingleExpr(in); |
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729 if( exp==null ) |
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730 return parser.failure(null); |
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731 if( parser.match('^') ) { |
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732 Spaces(in); |
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733 exp = new ConcatExpr( se(start), expr(exp), required(expr(PowExpr(in))) ); |
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734 } |
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735 return parser.success(exp); |
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736 } |
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737 |
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738 private Expressions SingleExpr(In in) throws ParseException { |
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739 parser.begin(); |
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740 Expressions exp; |
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741 exp = FunctionExpr(in); |
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742 if( exp != null ) |
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743 return parser.success(exp); |
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744 exp = TableExpr(in); |
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745 if( exp != null ) |
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746 return parser.success(exp); |
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747 exp = VarExp(in); |
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748 if( exp != null ) |
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749 return parser.success(exp); |
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750 exp = Literal(in); |
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751 if( exp != null ) |
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752 return parser.success(exp); |
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753 return parser.failure(null); |
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754 } |
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755 |
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756 private Expr FunctionExpr(In in) throws ParseException { |
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757 if( !Keyword("function",in) ) |
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758 return null; |
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759 return RequiredFunction(in); |
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760 } |
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761 |
129
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762 private FnDef RequiredFunction(In in) throws ParseException { |
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763 int start = parser.begin(); |
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764 RequiredMatch('('); |
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765 In inParens = in.parens(); |
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766 Spaces(inParens); |
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767 frame = new Frame(frame); |
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768 List<String> names = NameList(in); |
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769 if( names != null ) { |
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770 addSymbols(names); |
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771 if( parser.match(',') ) { |
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772 Spaces(inParens); |
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773 if( !parser.match("...") ) |
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774 throw parser.exception(); |
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775 frame.isVarArg = true; |
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776 } |
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777 } else if( parser.match("...") ) { |
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778 Spaces(inParens); |
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779 frame.isVarArg = true; |
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780 } |
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781 RequiredMatch(')'); |
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782 Spaces(in); |
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783 Stmt block = RequiredBlock(); |
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784 RequiredKeyword("end",in); |
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785 FnDef fnDef = newFnDef(start,block); |
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786 frame = frame.parent; |
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787 return parser.success(fnDef); |
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788 } |
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789 |
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790 private VarArgs VarArgs(In in) throws ParseException { |
104
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791 int start = parser.begin(); |
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792 if( !frame.isVarArg || !parser.match("...") ) |
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793 return parser.failure(null); |
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794 Spaces(in); |
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795 return parser.success( new VarArgs(se(start)) ); |
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796 } |
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797 |
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798 private Expr TableExpr(In in) throws ParseException { |
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799 int start = parser.begin(); |
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800 if( !parser.match('{') ) |
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801 return parser.failure(null); |
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802 In inParens = in.parens(); |
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803 Spaces(inParens); |
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804 List<TableExpr.Field> fields = new ArrayList<TableExpr.Field>(); |
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805 List<Expressions> builder = new ArrayList<Expressions>(); |
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806 while( Field(fields,builder,in) && FieldSep(inParens) ); |
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807 Spaces(inParens); |
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808 if( !parser.match('}') ) |
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809 throw parser.exception("Expected table element or '}'"); |
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810 return parser.success( new TableExpr( se(start), fields.toArray(new TableExpr.Field[0]), ExpList.build(builder) ) ); |
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811 } |
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812 |
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813 private boolean FieldSep(In in) throws ParseException { |
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814 if( !parser.anyOf(",;") ) |
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815 return false; |
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816 Spaces(in); |
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817 return true; |
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818 } |
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819 |
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820 private boolean Field(List<TableExpr.Field> fields,List<Expressions> builder,In in) throws ParseException { |
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821 parser.begin(); |
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822 Expr exp = SubExpr(in); |
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823 if( exp==null ) |
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824 exp = NameExpr(in); |
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825 if( exp!=null && parser.match('=') ) { |
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826 Spaces(in); |
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827 fields.add( new TableExpr.Field( exp, required(expr(Expr(in))) ) ); |
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828 return parser.success(); |
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829 } |
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830 parser.rollback(); |
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831 Expressions exprs = Expr(in); |
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832 if( exprs != null ) { |
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833 builder.add(exprs); |
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834 return parser.success(); |
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835 } |
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836 return parser.failure(); |
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837 } |
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838 |
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839 private Expressions VarExp(In in) throws ParseException { |
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840 Var var = VarZ(in); |
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841 return var==null ? null : var.expr(); |
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842 } |
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843 |
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844 private Var VarZ(In in) throws ParseException { |
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845 int start = parser.begin(); |
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846 Var var = VarStart(in); |
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847 if( var==null ) |
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848 return parser.failure(null); |
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849 Var var2; |
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850 while( (var2=Var2(in,start,var.expr())) != null ) { |
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851 var = var2; |
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852 } |
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853 return parser.success(var); |
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854 } |
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855 |
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856 private Var Var2(In in,int start,Expressions exp1) throws ParseException { |
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857 parser.begin(); |
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858 Var var = VarExt(in,start,exp1); |
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859 if( var != null ) |
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860 return parser.success(var); |
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861 if( parser.match("->") ) { |
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862 Spaces(in); |
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863 List<Expressions> builder = new ArrayList<Expressions>(); |
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864 builder.add(exp1); |
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865 Expr exp2 = expr(RequiredVarExpB(in)); |
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866 FnCall fnCall = required(Args( in, start, exp2, builder )); |
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867 return parser.success(exprVar(fnCall)); |
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868 } |
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869 FnCall fnCall = Args( in, start, expr(exp1), new ArrayList<Expressions>() ); |
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870 if( fnCall != null ) |
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871 return parser.success(exprVar(fnCall)); |
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872 return parser.failure(null); |
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873 } |
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874 |
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875 private Expressions RequiredVarExpB(In in) throws ParseException { |
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876 int start = parser.begin(); |
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877 Var var = required(VarStart(in)); |
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878 Var var2; |
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879 while( (var2=VarExt(in,start,var.expr())) != null ) { |
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880 var = var2; |
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881 } |
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882 return parser.success(var.expr()); |
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883 } |
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884 |
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885 private Var VarExt(In in,int start,Expressions exp1) throws ParseException { |
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886 parser.begin(); |
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887 Expr exp2 = SubExpr(in); |
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888 if( exp2 != null ) |
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889 return parser.success(indexVar(start,expr(exp1),exp2)); |
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890 if( parser.match('.') ) { |
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891 Spaces(in); |
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892 exp2 = NameExpr(in); |
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893 if( exp2!=null ) |
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894 return parser.success(indexVar(start,expr(exp1),exp2)); |
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895 } |
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896 return parser.failure(null); |
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897 } |
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898 |
129
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899 private Var VarStart(In in) throws ParseException { |
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900 int start = parser.begin(); |
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901 if( parser.match('(') ) { |
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902 In inParens = in.parens(); |
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903 Spaces(inParens); |
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904 Expr exp = expr(RequiredExpr(inParens)); |
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905 RequiredMatch(')'); |
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906 Spaces(in); |
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907 return parser.success(exprVar(exp)); |
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908 } |
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909 String name = Name(in); |
104
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910 if( name != null ) |
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911 return parser.success(nameVar(start,name)); |
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912 return parser.failure(null); |
9
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913 } |
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914 |
104
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915 private Expr env() { |
34
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916 int index = stackIndex(_ENV); |
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917 if( index != -1 ) |
40
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918 return new GetLocalVar(null,index); |
34
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919 index = upValueIndex(_ENV); |
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920 if( index != -1 ) |
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921 return new GetUpVar(null,index); |
34
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922 throw new RuntimeException("_ENV not found"); |
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923 } |
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924 |
104
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925 private interface Var { |
154
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926 public Expressions expr(); |
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927 public Settable settable(); |
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928 } |
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929 |
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930 private Var nameVar(final int start,final String name) { |
157
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931 return nameVar(se(start),name); |
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932 } |
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933 |
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934 private Var nameVar(final LuanSource.Element se,final String name) { |
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935 return new Var() { |
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936 |
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937 public Expr expr() { |
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938 int index = stackIndex(name); |
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939 if( index != -1 ) |
157
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940 return new GetLocalVar(se,index); |
104
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941 index = upValueIndex(name); |
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942 if( index != -1 ) |
157
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943 return new GetUpVar(se,index); |
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944 return new IndexExpr( se, env(), new ConstExpr(name) ); |
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945 } |
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946 |
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947 public Settable settable() { |
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948 int index = stackIndex(name); |
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949 if( index != -1 ) |
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950 return new SetLocalVar(index); |
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951 index = upValueIndex(name); |
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952 if( index != -1 ) |
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953 return new SetUpVar(index); |
157
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954 return new SetTableEntry( se, env(), new ConstExpr(name) ); |
104
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955 } |
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956 }; |
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957 } |
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958 |
154
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959 private Var exprVar(final Expressions expr) { |
104
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960 return new Var() { |
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961 |
154
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962 public Expressions expr() { |
104
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963 return expr; |
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964 } |
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965 |
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966 public Settable settable() { |
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967 return null; |
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968 } |
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969 }; |
11
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970 } |
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971 |
104
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972 private Var indexVar(final int start,final Expr table,final Expr key) { |
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973 return new Var() { |
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974 |
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975 public Expr expr() { |
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976 return new IndexExpr( se(start), table, key ); |
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977 } |
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978 |
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979 public Settable settable() { |
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980 return new SetTableEntry(se(start),table,key); |
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981 } |
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982 }; |
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983 } |
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984 |
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985 private FnCall Args(In in,int start,Expr fn,List<Expressions> builder) throws ParseException { |
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986 parser.begin(); |
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987 return args(in,builder) |
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988 ? parser.success( new FnCall( se(start), fn, ExpList.build(builder) ) ) |
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989 : parser.failure((FnCall)null); |
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990 } |
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991 |
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992 private boolean args(In in,List<Expressions> builder) throws ParseException { |
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993 if( parser.match('(') ) { |
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994 In inParens = in.parens(); |
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995 Spaces(inParens); |
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996 ExpList(inParens,builder); // optional |
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997 if( !parser.match(')') ) |
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998 throw parser.exception("Expression or ')' expected"); |
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999 Spaces(in); |
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1000 return true; |
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1001 } |
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1002 Expr exp = TableExpr(in); |
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1003 if( exp != null ) { |
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1004 builder.add(exp); |
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1005 return true; |
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1006 } |
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1007 String s = StringLiteral(in); |
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1008 if( s != null ) { |
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1009 builder.add( new ConstExpr(s) ); |
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1010 return true; |
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1011 } |
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1012 /* |
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1013 Expressions exps = TemplateExpressions(in); |
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1014 if( exps != null ) { |
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1015 builder.add(exps); |
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1016 return true; |
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1017 } |
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1018 */ |
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1019 return false; |
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1020 } |
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1021 |
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1022 private Expressions ExpList(In in) throws ParseException { |
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1023 List<Expressions> builder = new ArrayList<Expressions>(); |
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1024 return ExpList(in,builder) ? ExpList.build(builder) : null; |
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1025 } |
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1026 |
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1027 private boolean ExpList(In in,List<Expressions> builder) throws ParseException { |
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1028 parser.begin(); |
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1029 Expressions exp = TemplateExpressions(in); |
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1030 if( exp != null ) { |
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1031 builder.add(exp); |
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1032 return parser.success(); |
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1033 } |
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1034 exp = Expr(in); |
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1035 if( exp==null ) |
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1036 return parser.failure(); |
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1037 builder.add(exp); |
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1038 while( parser.match(',') ) { |
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1039 Spaces(in); |
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1040 exp = TemplateExpressions(in); |
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1041 if( exp != null ) { |
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1042 builder.add(exp); |
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1043 return parser.success(); |
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1044 } |
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1045 builder.add( RequiredExpr(in) ); |
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1046 } |
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1047 return parser.success(); |
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1048 } |
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1049 |
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1050 private Expr SubExpr(In in) throws ParseException { |
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1051 parser.begin(); |
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1052 if( !parser.match('[') ) |
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1053 return parser.failure(null); |
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1054 In inParens = in.parens(); |
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1055 Spaces(inParens); |
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1056 Expr exp = expr(RequiredExpr(inParens)); |
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1057 RequiredMatch(']'); |
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1058 Spaces(in); |
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1059 return parser.success(exp); |
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1060 } |
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1061 |
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1062 private Expr NameExpr(In in) throws ParseException { |
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1063 String name = Name(in); |
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1064 return name==null ? null : new ConstExpr(name); |
54
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1065 } |
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1066 |
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1067 private String RequiredName(In in) throws ParseException { |
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1068 parser.begin(); |
129
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1069 String name = Name(in); |
104
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1070 if( name==null ) |
139
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1071 throw parser.exception("Name expected"); |
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1072 return parser.success(name); |
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1073 } |
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1074 |
129
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1075 private String Name(In in) throws ParseException { |
104
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1076 int start = parser.begin(); |
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1077 if( !NameFirstChar() ) |
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1078 return parser.failure(null); |
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1079 while( NameChar() ); |
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1080 String match = parser.textFrom(start); |
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1081 if( keywords.contains(match) ) |
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1082 return parser.failure(null); |
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1083 Spaces(in); |
104
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1084 return parser.success(match); |
17
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1085 } |
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1086 |
104
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1087 private boolean NameChar() { |
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1088 return NameFirstChar() || Digit(); |
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1089 } |
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1090 |
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1091 private boolean NameFirstChar() { |
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1092 return parser.inCharRange('a', 'z') || parser.inCharRange('A', 'Z') || parser.match('_'); |
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1093 } |
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1094 |
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1095 private void RequiredMatch(char c) throws ParseException { |
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1096 if( !parser.match(c) ) |
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1097 throw parser.exception("'"+c+"' expected"); |
9
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1098 } |
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1099 |
104
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1100 private void RequiredMatch(String s) throws ParseException { |
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1101 if( !parser.match(s) ) |
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1102 throw parser.exception("'"+s+"' expected"); |
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1103 } |
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1104 |
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1105 private void RequiredKeyword(String keyword,In in) throws ParseException { |
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1106 if( !Keyword(keyword,in) ) |
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1107 throw parser.exception("'"+keyword+"' expected"); |
9
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1108 } |
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1109 |
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1110 private boolean Keyword(String keyword,In in) throws ParseException { |
104
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1111 parser.begin(); |
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1112 if( !parser.match(keyword) || NameChar() ) |
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1113 return parser.failure(); |
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1114 Spaces(in); |
104
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1115 return parser.success(); |
12
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1116 } |
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1117 |
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1118 private static final Set<String> keywords = new HashSet<String>(Arrays.asList( |
12
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1119 "and", |
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1120 "break", |
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1121 "catch", |
12
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1122 "do", |
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1123 "else", |
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1124 "elseif", |
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1125 "end", |
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1126 "false", |
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1127 "for", |
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1128 "function", |
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1129 "goto", |
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1130 "if", |
108
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1131 "import", |
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1132 "in", |
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1133 "local", |
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1134 "nil", |
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1135 "not", |
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1136 "or", |
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1137 "repeat", |
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1138 "return", |
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1139 "then", |
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1140 "true", |
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1141 "try", |
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1142 "until", |
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1143 "while" |
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1144 )); |
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1145 |
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1146 private Expr Literal(In in) throws ParseException { |
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1147 if( NilLiteral(in) ) |
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1148 return new ConstExpr(null); |
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1149 Boolean b = BooleanLiteral(in); |
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1150 if( b != null ) |
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1151 return new ConstExpr(b); |
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1152 Number n = NumberLiteral(in); |
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1153 if( n != null ) |
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1154 return new ConstExpr(n); |
129
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1155 String s = StringLiteral(in); |
104
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1156 if( s != null ) |
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1157 return new ConstExpr(s); |
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1158 return null; |
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1159 } |
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1160 |
129
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1161 private boolean NilLiteral(In in) throws ParseException { |
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1162 return Keyword("nil",in); |
65
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1163 } |
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1164 |
129
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1165 private Boolean BooleanLiteral(In in) throws ParseException { |
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1166 if( Keyword("true",in) ) |
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1167 return true; |
129
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1168 if( Keyword("false",in) ) |
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1169 return false; |
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1170 return null; |
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1171 } |
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1172 |
129
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1173 private Number NumberLiteral(In in) throws ParseException { |
104
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1174 parser.begin(); |
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1175 Number n; |
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1176 if( parser.matchIgnoreCase("0x") ) { |
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1177 n = HexNumber(); |
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1178 } else { |
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1179 n = DecNumber(); |
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1180 } |
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1181 if( n==null || NameChar() ) |
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1182 return parser.failure(null); |
129
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1183 Spaces(in); |
104
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1184 return parser.success(n); |
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1185 } |
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1186 |
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1187 private Number DecNumber() { |
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1188 int start = parser.begin(); |
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1189 if( Int() ) { |
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1190 if( parser.match('.') ) |
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1191 Int(); // optional |
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1192 } else if( parser.match('.') && Int() ) { |
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1193 // ok |
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1194 } else |
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1195 return parser.failure(null); |
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1196 Exponent(); // optional |
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1197 return parser.success(Double.valueOf(parser.textFrom(start))); |
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1198 } |
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1199 |
104
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1200 private boolean Exponent() { |
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1201 parser.begin(); |
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1202 if( !parser.matchIgnoreCase("e") ) |
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1203 return parser.failure(); |
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1204 parser.anyOf("+-"); // optional |
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1205 if( !Int() ) |
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1206 return parser.failure(); |
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1207 return parser.success(); |
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1208 } |
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1209 |
104
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1210 private boolean Int() { |
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1211 if( !Digit() ) |
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1212 return false; |
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1213 while( Digit() ); |
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1214 return true; |
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1215 } |
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1216 |
104
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1217 private boolean Digit() { |
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1218 return parser.inCharRange('0', '9'); |
16
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1219 } |
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1220 |
104
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1221 private Number HexNumber() { |
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1222 int start = parser.begin(); |
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1223 double n; |
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1224 if( HexInt() ) { |
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1225 n = (double)Long.parseLong(parser.textFrom(start),16); |
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1226 if( parser.match('.') ) { |
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1227 start = parser.currentIndex(); |
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1228 if( HexInt() ) { |
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1229 String dec = parser.textFrom(start); |
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1230 n += (double)Long.parseLong(dec,16) / Math.pow(16,dec.length()); |
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1231 } |
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1232 } |
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1233 } else if( parser.match('.') && HexInt() ) { |
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1234 String dec = parser.textFrom(start+1); |
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1235 n = (double)Long.parseLong(dec,16) / Math.pow(16,dec.length()); |
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1236 } else { |
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1237 return parser.failure(null); |
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1238 } |
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1239 if( parser.matchIgnoreCase("p") ) { |
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1240 parser.anyOf("+-"); // optional |
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1241 start = parser.currentIndex(); |
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1242 if( !HexInt() ) |
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1243 return parser.failure(null); |
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1244 n *= Math.pow(2,(double)Long.parseLong(parser.textFrom(start))); |
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1245 } |
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1246 return parser.success(Double.valueOf(n)); |
16
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1247 } |
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1248 |
104
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1249 private boolean HexInt() { |
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1250 if( !HexDigit() ) |
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1251 return false; |
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1252 while( HexDigit() ); |
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1253 return true; |
16
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1254 } |
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1255 |
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1256 |
104
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1257 private boolean HexDigit() { |
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1258 return Digit() || parser.anyOf("abcdefABCDEF"); |
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1259 } |
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1260 |
129
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1261 private String StringLiteral(In in) throws ParseException { |
104
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1262 String s; |
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1263 if( (s=QuotedString('"'))==null |
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1264 && (s=QuotedString('\''))==null |
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1265 && (s=LongString())==null |
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1266 ) |
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1267 return null; |
129
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1268 Spaces(in); |
104
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1269 return s; |
16
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1270 } |
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1271 |
104
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1272 private String LongString() throws ParseException { |
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1273 parser.begin(); |
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1274 if( !parser.match('[') ) |
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1275 return parser.failure(null); |
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1276 int start = parser.currentIndex(); |
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1277 while( parser.match('=') ); |
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1278 int nEquals = parser.currentIndex() - start; |
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1279 if( !parser.match('[') ) |
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1280 return parser.failure(null); |
120
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1281 EndOfLine(); |
104
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1282 start = parser.currentIndex(); |
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1283 while( !LongBracketsEnd(nEquals) ) { |
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1284 if( !parser.anyChar() ) |
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1285 throw parser.exception("Unclosed long string"); |
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1286 } |
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1287 String s = parser.text.substring( start, parser.currentIndex() - nEquals - 2 ); |
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1288 return parser.success(s); |
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1289 } |
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1290 |
104
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1291 private String QuotedString(char quote) throws ParseException { |
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1292 parser.begin(); |
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1293 if( !parser.match(quote) ) |
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1294 return parser.failure(null); |
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1295 StringBuilder buf = new StringBuilder(); |
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1296 while( !parser.match(quote) ) { |
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1297 Character c = EscSeq(); |
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1298 if( c != null ) { |
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1299 buf.append(c); |
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1300 } else { |
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1301 if( !parser.anyChar() ) |
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1302 throw parser.exception("Unclosed string"); |
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1303 buf.append(parser.lastChar()); |
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1304 } |
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1305 } |
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1306 return parser.success(buf.toString()); |
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1307 } |
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1308 |
104
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1309 private Character EscSeq() { |
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1310 parser.begin(); |
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1311 if( !parser.match('\\') ) |
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1312 return parser.failure(null); |
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1313 if( parser.match('a') ) return parser.success('\u0007'); |
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1314 if( parser.match('b') ) return parser.success('\b'); |
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1315 if( parser.match('f') ) return parser.success('\f'); |
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1316 if( parser.match('n') ) return parser.success('\n'); |
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1317 if( parser.match('r') ) return parser.success('\r'); |
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1318 if( parser.match('t') ) return parser.success('\t'); |
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1319 if( parser.match('v') ) return parser.success('\u000b'); |
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1320 if( parser.match('\\') ) return parser.success('\\'); |
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1321 if( parser.match('"') ) return parser.success('"'); |
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1322 if( parser.match('\'') ) return parser.success('\''); |
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1323 int start = parser.currentIndex(); |
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1324 if( parser.match('x') && HexDigit() && HexDigit() ) |
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1325 return parser.success((char)Integer.parseInt(parser.textFrom(start+1),16)); |
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1326 if( Digit() ) { |
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1327 if( Digit() ) Digit(); // optional |
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1328 return parser.success((char)Integer.parseInt(parser.textFrom(start))); |
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1329 } |
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1330 return parser.failure(null); |
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1331 } |
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1332 |
129
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1333 private void Spaces(In in) throws ParseException { |
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1334 while( parser.anyOf(" \t") || Comment() || ContinueOnNextLine() || in.parens && NewLine() ); |
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1335 } |
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1336 |
104
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1337 private boolean ContinueOnNextLine() { |
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1338 parser.begin(); |
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1339 return parser.match('\\') && EndOfLine() ? parser.success() : parser.failure(); |
7
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1340 } |
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1341 |
104
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1342 private boolean NewLine() { |
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1343 if( !EndOfLine() ) |
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1344 return false; |
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1345 if( parser.match("--") ) { |
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1346 while( parser.noneOf("\r\n") ); |
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1347 } |
18
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1348 return true; |
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1349 } |
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1350 |
104
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1351 private boolean Comment() throws ParseException { |
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1352 parser.begin(); |
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1353 if( !parser.match("--[") ) |
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1354 return parser.failure(); |
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1355 int start = parser.currentIndex(); |
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1356 while( parser.match('=') ); |
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1357 int nEquals = parser.currentIndex() - start; |
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1358 if( !parser.match('[') ) |
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1359 return parser.failure(); |
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1360 while( !LongBracketsEnd(nEquals) ) { |
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1361 if( !parser.anyChar() ) |
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1362 throw parser.exception("Unclosed comment"); |
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1363 } |
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1364 return parser.success(); |
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1365 } |
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1366 |
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1367 private boolean LongBracketsEnd(int nEquals) { |
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1368 parser.begin(); |
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1369 if( !parser.match(']') ) |
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1370 return parser.failure(); |
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1371 while( nEquals-- > 0 ) { |
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1372 if( !parser.match('=') ) |
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1373 return parser.failure(); |
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1374 } |
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1375 if( !parser.match(']') ) |
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1376 return parser.failure(); |
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1377 return parser.success(); |
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1378 } |
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1379 |
5
9ef0fd711101
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1380 } |