Mercurial Hosting > luan
annotate core/src/luan/impl/LuanParser.java @ 534:115cae4ac8fd
fix exponentiation operator
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 29 May 2015 01:08:30 -0600 |
parents | 8e51d6071b67 |
children | 289908469e02 |
rev | line source |
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166
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move luan/interp to impl
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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; |
460 | 12 import luan.LuanElement; |
503 | 13 import luan.LuanTable; |
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14 import luan.modules.PackageLuan; |
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15 |
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16 |
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17 final class LuanParser { |
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18 |
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19 private static final class Frame { |
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20 final Frame parent; |
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21 final List<String> symbols = new ArrayList<String>(); |
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22 int stackSize = 0; |
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23 int loops = 0; |
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24 boolean isVarArg = false; |
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25 final List<String> upValueSymbols = new ArrayList<String>(); |
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26 final List<UpValue.Getter> upValueGetters = new ArrayList<UpValue.Getter>(); |
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27 |
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28 Frame(LuanTable java) { |
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29 this.parent = null; |
503 | 30 upValueSymbols.add(JAVA); |
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31 upValueGetters.add(new UpValue.ValueGetter(java)); |
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32 } |
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33 |
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34 Frame(Frame parent) { |
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35 this.parent = parent; |
503 | 36 if( upValueIndex(JAVA) != 0 ) |
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37 throw new RuntimeException(); |
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38 } |
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39 |
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40 int stackIndex(String name) { |
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41 int i = symbols.size(); |
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42 while( --i >= 0 ) { |
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43 if( symbols.get(i).equals(name) ) |
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44 return i; |
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45 } |
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46 return -1; |
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47 } |
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48 |
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49 int upValueIndex(String name) { |
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50 int i = upValueSymbols.size(); |
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51 while( --i >= 0 ) { |
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52 if( upValueSymbols.get(i).equals(name) ) |
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53 return i; |
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54 } |
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55 if( parent==null ) |
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56 return -1; |
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57 i = parent.stackIndex(name); |
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58 if( i != -1 ) { |
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59 upValueGetters.add(new UpValue.StackGetter(i)); |
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60 } else { |
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61 i = parent.upValueIndex(name); |
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62 if( i == -1 ) |
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63 return -1; |
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64 upValueGetters.add(new UpValue.NestedGetter(i)); |
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65 } |
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66 upValueSymbols.add(name); |
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67 return upValueSymbols.size() - 1; |
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68 } |
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69 |
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70 void addUpValueGetter(String name,UpValue.Getter upValueGetter) { |
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71 upValueSymbols.add(name); |
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72 upValueGetters.add(upValueGetter); |
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73 } |
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74 } |
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75 |
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76 private static class In { |
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77 static final In NOTHING = new In(false,false); |
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78 |
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79 final boolean parens; |
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80 final boolean template; |
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81 |
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82 private In(boolean parens,boolean template) { |
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83 this.parens = parens; |
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84 this.template = template; |
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85 } |
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86 |
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87 In parens() { |
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88 return parens ? this : new In(true,false); |
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89 } |
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90 |
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91 In template() { |
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92 return template ? this : new In(false,true); |
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93 } |
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94 } |
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95 |
503 | 96 private static final String JAVA = "-JAVA-"; // inaccessible from Luan |
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97 private static final String _ENV = "_ENV"; |
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98 private static final UpValue.Getter[] NO_UP_VALUE_GETTERS = new UpValue.Getter[0]; |
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99 |
128
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100 final LuanSource source; |
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101 private Frame frame; |
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102 private final Parser parser; |
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103 |
503 | 104 LuanParser(LuanSource source,LuanTable env) { |
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105 this.source = source; |
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106 this.frame = new Frame( env!=null ? env : new LuanTable() ); |
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107 this.parser = new Parser(source); |
503 | 108 if( env != null ) |
109 addVar(_ENV,env); | |
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110 } |
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111 |
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112 void addVar(String name,Object value) { |
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113 frame.addUpValueGetter(name,new UpValue.ValueGetter(value)); |
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114 } |
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115 |
460 | 116 private LuanElement se(int start) { |
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117 return se(start,null); |
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118 } |
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119 |
460 | 120 private LuanElement se(int start,String text) { |
121 return new LuanElement(source,start,parser.currentIndex(),text); | |
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122 } |
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123 |
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124 private List<String> symbols() { |
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125 return frame.symbols; |
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126 } |
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127 |
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128 private int symbolsSize() { |
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129 return frame.symbols.size(); |
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130 } |
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131 |
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132 private void addSymbol(String name) { |
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133 frame.symbols.add(name); |
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134 if( frame.stackSize < symbolsSize() ) |
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135 frame.stackSize = symbolsSize(); |
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136 } |
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137 |
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138 private void addSymbols(List<String> names) { |
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139 frame.symbols.addAll(names); |
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140 if( frame.stackSize < symbolsSize() ) |
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141 frame.stackSize = symbolsSize(); |
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142 } |
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143 |
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144 private int stackIndex(String name) { |
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145 return frame.stackIndex(name); |
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146 } |
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147 |
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148 private void popSymbols(int n) { |
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149 List<String> symbols = frame.symbols; |
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150 while( n-- > 0 ) { |
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151 symbols.remove(symbols.size()-1); |
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152 } |
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153 } |
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154 |
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155 private int upValueIndex(String name) { |
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156 return frame.upValueIndex(name); |
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157 } |
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158 |
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159 private void incLoops() { |
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160 frame.loops++; |
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161 } |
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162 |
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163 private void decLoops() { |
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164 frame.loops--; |
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165 } |
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166 |
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167 private <T> T required(T t) throws ParseException { |
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168 if( t==null ) |
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169 throw parser.exception(); |
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170 return t; |
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171 } |
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172 |
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173 private <T> T required(T t,String msg) throws ParseException { |
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174 if( t==null ) |
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175 throw parser.exception(msg); |
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176 return t; |
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177 } |
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178 |
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179 private static Expr expr(Expressions exprs) { |
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180 if( exprs==null ) |
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181 return null; |
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182 if( exprs instanceof Expr ) |
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183 return (Expr)exprs; |
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184 return new ExpressionsExpr(exprs); |
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185 } |
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186 |
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187 private FnDef newFnDef(int start,Stmt stmt) { |
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188 return new FnDef( se(start), stmt, frame.stackSize, symbolsSize(), frame.isVarArg, frame.upValueGetters.toArray(NO_UP_VALUE_GETTERS) ); |
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189 } |
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190 |
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191 FnDef Expression() throws ParseException { |
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192 Spaces(In.NOTHING); |
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193 int start = parser.begin(); |
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194 Expressions expr = ExprZ(In.NOTHING); |
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195 if( expr != null && parser.endOfInput() ) { |
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196 Stmt stmt = new ReturnStmt( se(start), expr ); |
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197 return parser.success(newFnDef(start,stmt)); |
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198 } |
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199 return parser.failure(null); |
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200 } |
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201 |
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202 FnDef RequiredModule() throws ParseException { |
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203 Spaces(In.NOTHING); |
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204 int start = parser.begin(); |
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205 frame.isVarArg = true; |
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206 Stmt stmt = RequiredBlock(); |
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207 if( parser.endOfInput() ) |
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208 return parser.success(newFnDef(start,stmt)); |
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209 throw parser.exception(); |
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210 } |
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211 |
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212 private Stmt RequiredBlock() throws ParseException { |
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213 List<Stmt> stmts = new ArrayList<Stmt>(); |
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214 int stackStart = symbolsSize(); |
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215 Stmt(stmts); |
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216 while( StmtSep(stmts) ) { |
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217 Spaces(In.NOTHING); |
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218 Stmt(stmts); |
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219 } |
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220 int stackEnd = symbolsSize(); |
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221 popSymbols( stackEnd - stackStart ); |
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222 if( stmts.isEmpty() ) |
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223 return Stmt.EMPTY; |
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224 if( stmts.size()==1 && stackStart==stackEnd ) |
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225 return stmts.get(0); |
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226 return new Block( stmts.toArray(new Stmt[0]), stackStart, stackEnd ); |
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227 } |
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228 |
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229 private boolean StmtSep(List<Stmt> stmts) throws ParseException { |
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230 parser.begin(); |
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231 if( parser.match( ';' ) ) |
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232 return parser.success(); |
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233 if( EndOfLine() ) |
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234 return parser.success(); |
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235 parser.rollback(); |
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236 Stmt stmt = TemplateStmt(); |
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237 if( stmt != null ) { |
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238 stmts.add(stmt); |
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239 return parser.success(); |
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240 } |
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241 return parser.failure(); |
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242 } |
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243 |
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244 private boolean EndOfLine() { |
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245 return parser.match( "\r\n" ) || parser.match( '\r' ) || parser.match( '\n' ); |
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246 } |
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247 |
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248 private void Stmt(List<Stmt> stmts) throws ParseException { |
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249 if( LocalStmt(stmts) ) |
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250 return; |
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251 Stmt stmt; |
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252 if( (stmt=ReturnStmt()) != null |
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253 || (stmt=FunctionStmt()) != null |
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254 || (stmt=LocalFunctionStmt()) != null |
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255 || (stmt=BreakStmt()) != null |
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256 || (stmt=ForStmt()) != null |
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257 || (stmt=DoStmt()) != null |
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258 || (stmt=WhileStmt()) != null |
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259 || (stmt=FunctionStmt()) != null |
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260 || (stmt=RepeatStmt()) != null |
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261 || (stmt=IfStmt()) != null |
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262 || (stmt=SetStmt()) != null |
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263 || (stmt=ExpressionsStmt()) != null |
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264 ) { |
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265 stmts.add(stmt); |
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266 } |
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267 } |
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268 |
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269 private Stmt TemplateStmt() throws ParseException { |
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270 int start = parser.currentIndex(); |
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271 Expressions exprs = TemplateExpressions(In.NOTHING); |
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272 if( exprs == null ) |
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273 return null; |
460 | 274 LuanElement se = se(start,"require 'luan:Io'"); |
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275 FnCall requireCall = new FnCall( se, new ConstExpr(se,PackageLuan.requireFn), new ConstExpr(se,"luan:Io") ); |
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276 se = se(start,"stdout"); |
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277 Expr stdoutExp = new IndexExpr( se, expr(requireCall), new ConstExpr(se,"stdout") ); |
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278 se = se(start,"write"); |
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279 Expr writeExp = new IndexExpr( se, stdoutExp, new ConstExpr(se,"write") ); |
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280 FnCall writeCall = new FnCall( se(start), writeExp, exprs ); |
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281 return new ExpressionsStmt(writeCall); |
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282 } |
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283 |
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284 private Expressions TemplateExpressions(In in) throws ParseException { |
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285 if( in.template ) |
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286 return null; |
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287 int start = parser.begin(); |
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288 if( !parser.match( "%>" ) ) |
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289 return parser.failure(null); |
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290 EndOfLine(); |
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291 In inTemplate = in.template(); |
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292 List<Expressions> builder = new ArrayList<Expressions>(); |
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293 while(true) { |
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294 if( parser.match( "<%=" ) ) { |
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295 Spaces(inTemplate); |
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296 builder.add( RequiredExpr(inTemplate) ); |
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297 RequiredMatch( "%>" ); |
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298 } else if( parser.match( "<%" ) ) { |
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299 Spaces(inTemplate); |
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300 return parser.success(ExpList.build(builder)); |
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301 } else { |
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302 int i = parser.currentIndex(); |
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303 do { |
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304 if( parser.match( "%>" ) ) |
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305 throw parser.exception("'%>' unexpected"); |
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306 if( !parser.anyChar() ) |
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307 throw parser.exception("Unclosed template expression"); |
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308 } while( !parser.test( "<%" ) ); |
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309 String match = parser.textFrom(i); |
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310 builder.add( new ConstExpr(se(i),match) ); |
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311 } |
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312 } |
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313 } |
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314 |
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315 private Stmt ReturnStmt() throws ParseException { |
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316 int start = parser.begin(); |
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317 if( !Keyword("return",In.NOTHING) ) |
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318 return parser.failure(null); |
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319 Expressions exprs = ExpList(In.NOTHING); |
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320 if( exprs==null ) |
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321 exprs = ExpList.emptyExpList; |
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322 return parser.success( new ReturnStmt(se(start),exprs) ); |
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323 } |
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324 |
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325 private Stmt FunctionStmt() throws ParseException { |
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326 parser.begin(); |
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327 if( !Keyword("function",In.NOTHING) ) |
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328 return parser.failure(null); |
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329 |
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330 int start = parser.currentIndex(); |
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331 Var var = nameVar(start,RequiredName(In.NOTHING)); |
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332 while( parser.match( '.' ) ) { |
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333 Spaces(In.NOTHING); |
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334 var = indexVar( start, expr(var.expr()), NameExpr(In.NOTHING) ); |
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335 } |
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336 Settable fnName = var.settable(); |
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337 |
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338 FnDef fnDef = RequiredFunction(In.NOTHING); |
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339 return parser.success( new SetStmt(fnName,fnDef) ); |
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340 } |
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341 |
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342 private Stmt LocalFunctionStmt() throws ParseException { |
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343 parser.begin(); |
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344 if( !(Keyword("local",In.NOTHING) && Keyword("function",In.NOTHING)) ) |
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345 return parser.failure(null); |
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346 String name = RequiredName(In.NOTHING); |
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347 addSymbol( name ); |
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348 FnDef fnDef = RequiredFunction(In.NOTHING); |
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349 return parser.success( new SetStmt( new SetLocalVar(symbolsSize()-1), fnDef ) ); |
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350 } |
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351 |
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352 private Stmt BreakStmt() throws ParseException { |
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353 parser.begin(); |
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354 if( !Keyword("break",In.NOTHING) ) |
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355 return parser.failure(null); |
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356 if( frame.loops <= 0 ) |
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357 throw parser.exception("'break' outside of loop"); |
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358 return parser.success( new BreakStmt() ); |
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359 } |
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360 |
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361 private Stmt ForStmt() throws ParseException { |
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362 int start = parser.begin(); |
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363 int stackStart = symbolsSize(); |
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364 if( !Keyword("for",In.NOTHING) ) |
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365 return parser.failure(null); |
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366 List<String> names = RequiredNameList(In.NOTHING); |
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367 if( !Keyword("in",In.NOTHING) ) |
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368 return parser.failure(null); |
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369 Expr expr = expr(RequiredExpr(In.NOTHING)); |
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370 RequiredKeyword("do",In.NOTHING); |
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371 addSymbols(names); |
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372 Stmt loop = RequiredLoopBlock(); |
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373 RequiredKeyword("end",In.NOTHING); |
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374 Stmt stmt = new ForStmt( se(start), stackStart, symbolsSize() - stackStart, expr, loop ); |
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375 popSymbols( symbolsSize() - stackStart ); |
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376 return parser.success(stmt); |
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377 } |
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378 |
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379 private Stmt DoStmt() throws ParseException { |
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380 parser.begin(); |
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381 if( !Keyword("do",In.NOTHING) ) |
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382 return parser.failure(null); |
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383 Stmt stmt = RequiredBlock(); |
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384 RequiredKeyword("end",In.NOTHING); |
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385 return parser.success(stmt); |
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386 } |
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387 |
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388 private boolean LocalStmt(List<Stmt> stmts) throws ParseException { |
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389 parser.begin(); |
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390 if( !Keyword("local",In.NOTHING) ) |
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391 return parser.failure(); |
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392 List<String> names = NameList(In.NOTHING); |
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393 if( names==null ) { |
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394 if( Keyword("function",In.NOTHING) ) |
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395 return parser.failure(); // handled later |
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396 throw parser.exception("Invalid local statement"); |
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397 } |
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398 if( parser.match( '=' ) ) { |
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399 Spaces(In.NOTHING); |
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400 Expressions values = ExpList(In.NOTHING); |
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401 if( values==null ) |
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402 throw parser.exception("Expressions expected"); |
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403 SetLocalVar[] vars = new SetLocalVar[names.size()]; |
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404 int stackStart = symbolsSize(); |
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405 for( int i=0; i<vars.length; i++ ) { |
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406 vars[i] = new SetLocalVar(stackStart+i); |
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407 } |
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408 stmts.add( new SetStmt( vars, values ) ); |
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409 } |
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410 addSymbols(names); |
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411 return parser.success(); |
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412 } |
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413 |
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414 private List<String> RequiredNameList(In in) throws ParseException { |
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415 parser.begin(); |
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416 List<String> names = NameList(in); |
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417 if( names==null ) |
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418 throw parser.exception("Name expected"); |
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419 return parser.success(names); |
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420 } |
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421 |
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422 private List<String> NameList(In in) throws ParseException { |
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423 String name = Name(in); |
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424 if( name==null ) |
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425 return null; |
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426 List<String> names = new ArrayList<String>(); |
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427 names.add(name); |
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428 while( (name=anotherName(in)) != null ) { |
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429 names.add(name); |
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430 } |
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431 return names; |
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432 } |
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433 |
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434 private String anotherName(In in) throws ParseException { |
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435 parser.begin(); |
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436 if( !parser.match( ',' ) ) |
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437 return parser.failure(null); |
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438 Spaces(in); |
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439 String name = Name(in); |
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440 if( name==null ) |
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441 return parser.failure(null); |
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442 return parser.success(name); |
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443 } |
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444 |
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445 private Stmt WhileStmt() throws ParseException { |
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446 int start = parser.begin(); |
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447 if( !Keyword("while",In.NOTHING) ) |
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448 return parser.failure(null); |
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449 Expr cnd = expr(RequiredExpr(In.NOTHING)); |
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450 RequiredKeyword("do",In.NOTHING); |
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451 Stmt loop = RequiredLoopBlock(); |
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452 RequiredKeyword("end",In.NOTHING); |
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453 return parser.success( new WhileStmt(se(start),cnd,loop) ); |
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454 } |
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455 |
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456 private Stmt RepeatStmt() throws ParseException { |
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457 int start = parser.begin(); |
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458 if( !Keyword("repeat",In.NOTHING) ) |
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459 return parser.failure(null); |
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460 Stmt loop = RequiredLoopBlock(); |
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461 RequiredKeyword("until",In.NOTHING); |
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462 Expr cnd = expr(RequiredExpr(In.NOTHING)); |
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463 return parser.success( new RepeatStmt(se(start),loop,cnd) ); |
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464 } |
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465 |
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466 private Stmt RequiredLoopBlock() throws ParseException { |
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467 incLoops(); |
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468 Stmt stmt = RequiredBlock(); |
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469 decLoops(); |
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470 return stmt; |
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471 } |
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472 |
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473 private Stmt IfStmt() throws ParseException { |
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474 parser.begin(); |
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475 if( !Keyword("if",In.NOTHING) ) |
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476 return parser.failure(null); |
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477 return parser.success( IfStmt2() ); |
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478 } |
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479 |
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480 private Stmt IfStmt2() throws ParseException { |
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481 int start = parser.currentIndex(); |
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482 Expr cnd = expr(RequiredExpr(In.NOTHING)); |
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483 RequiredKeyword("then",In.NOTHING); |
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484 Stmt thenBlock = RequiredBlock(); |
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485 Stmt elseBlock; |
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486 if( Keyword("elseif",In.NOTHING) ) { |
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487 elseBlock = IfStmt2(); |
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488 } else { |
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489 elseBlock = Keyword("else",In.NOTHING) ? RequiredBlock() : Stmt.EMPTY; |
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490 RequiredKeyword("end",In.NOTHING); |
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491 } |
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492 return new IfStmt(se(start),cnd,thenBlock,elseBlock); |
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493 } |
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494 |
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495 private Stmt SetStmt() throws ParseException { |
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496 parser.begin(); |
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497 List<Settable> vars = new ArrayList<Settable>(); |
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498 Settable s = SettableVar(); |
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499 if( s == null ) |
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500 return parser.failure(null); |
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501 vars.add(s); |
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502 while( parser.match( ',' ) ) { |
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503 Spaces(In.NOTHING); |
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504 s = SettableVar(); |
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505 if( s == null ) |
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506 return parser.failure(null); |
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507 vars.add(s); |
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508 } |
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509 if( !parser.match( '=' ) ) |
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510 return parser.failure(null); |
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511 Spaces(In.NOTHING); |
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512 Expressions values = ExpList(In.NOTHING); |
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513 if( values==null ) |
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514 // throw parser.exception("Expressions expected"); |
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515 return parser.failure(null); |
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516 return parser.success( new SetStmt( vars.toArray(new Settable[0]), values ) ); |
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517 } |
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518 |
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519 private Stmt ExpressionsStmt() throws ParseException { |
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520 parser.begin(); |
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521 Expressions exp = ExprZ(In.NOTHING); |
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522 if( exp instanceof FnCall || exp instanceof AndExpr || exp instanceof OrExpr ) |
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523 return parser.success( new ExpressionsStmt(exp) ); |
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524 return parser.failure(null); |
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525 } |
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526 |
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527 private Settable SettableVar() throws ParseException { |
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528 int start = parser.begin(); |
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529 Var var = VarZ(In.NOTHING); |
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530 if( var==null ) |
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531 return parser.failure(null); |
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532 return parser.success( var.settable() ); |
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533 } |
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534 |
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535 private Expressions RequiredExpr(In in) throws ParseException { |
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536 parser.begin(); |
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537 return parser.success(required(ExprZ(in),"Bad expression")); |
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538 } |
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539 |
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540 private Expressions ExprZ(In in) throws ParseException { |
449 | 541 return OrExpr(in); |
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542 } |
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543 |
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544 private Expressions OrExpr(In in) throws ParseException { |
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545 int start = parser.begin(); |
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546 Expressions exp = AndExpr(in); |
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547 if( exp==null ) |
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548 return parser.failure(null); |
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549 while( Keyword("or",in) ) { |
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550 Expressions exp2 = AndExpr(in); |
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551 exp = new OrExpr( se(start), expr(exp), required(expr(exp2)) ); |
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552 } |
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553 return parser.success(exp); |
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554 } |
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555 |
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556 private Expressions AndExpr(In in) throws ParseException { |
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557 int start = parser.begin(); |
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558 Expressions exp = RelExpr(in); |
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559 if( exp==null ) |
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560 return parser.failure(null); |
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561 while( Keyword("and",in) ) { |
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562 Expressions exp2 = RelExpr(in); |
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563 exp = new AndExpr( se(start), expr(exp), required(expr(exp2)) ); |
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564 } |
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565 return parser.success(exp); |
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566 } |
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567 |
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568 private Expressions RelExpr(In in) throws ParseException { |
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569 int start = parser.begin(); |
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570 Expressions exp = ConcatExpr(in); |
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571 if( exp==null ) |
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572 return parser.failure(null); |
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573 while(true) { |
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574 if( parser.match("==") ) { |
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575 Spaces(in); |
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576 Expressions exp2 = ConcatExpr(in); |
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577 exp = new EqExpr( se(start), expr(exp), required(expr(exp2)) ); |
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578 } else if( parser.match("~=") ) { |
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579 Spaces(in); |
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580 Expressions exp2 = ConcatExpr(in); |
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581 exp = new NotExpr( se(start), new EqExpr( se(start), expr(exp), required(expr(exp2)) ) ); |
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582 } else if( parser.match("<=") ) { |
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583 Spaces(in); |
191
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584 Expressions exp2 = ConcatExpr(in); |
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585 exp = new LeExpr( se(start), expr(exp), required(expr(exp2)) ); |
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586 } else if( parser.match(">=") ) { |
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587 Spaces(in); |
191
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588 Expressions exp2 = ConcatExpr(in); |
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589 exp = new LeExpr( se(start), required(expr(exp2)), expr(exp) ); |
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590 } else if( parser.match("<") ) { |
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591 Spaces(in); |
191
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592 Expressions exp2 = ConcatExpr(in); |
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593 exp = new LtExpr( se(start), expr(exp), required(expr(exp2)) ); |
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594 } else if( parser.match(">") ) { |
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595 Spaces(in); |
191
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596 Expressions exp2 = ConcatExpr(in); |
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597 exp = new LtExpr( se(start), required(expr(exp2)), expr(exp) ); |
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598 } else |
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599 break; |
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600 } |
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601 return parser.success(exp); |
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602 } |
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603 |
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604 private Expressions ConcatExpr(In in) throws ParseException { |
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605 int start = parser.begin(); |
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606 Expressions exp = SumExpr(in); |
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607 if( exp==null ) |
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608 return parser.failure(null); |
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609 if( parser.match("..") ) { |
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610 Spaces(in); |
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611 Expressions exp2 = ConcatExpr(in); |
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612 exp = new ConcatExpr( se(start), expr(exp), required(expr(exp2)) ); |
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613 } |
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614 return parser.success(exp); |
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615 } |
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616 |
154
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617 private Expressions SumExpr(In in) throws ParseException { |
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618 int start = parser.begin(); |
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619 Expressions exp = TermExpr(in); |
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620 if( exp==null ) |
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621 return parser.failure(null); |
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622 while(true) { |
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623 if( parser.match('+') ) { |
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624 Spaces(in); |
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625 Expressions exp2 = TermExpr(in); |
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626 exp = new AddExpr( se(start), expr(exp), required(expr(exp2)) ); |
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627 } else if( Minus() ) { |
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628 Spaces(in); |
191
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629 Expressions exp2 = TermExpr(in); |
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630 exp = new SubExpr( se(start), expr(exp), required(expr(exp2)) ); |
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631 } else |
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632 break; |
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633 } |
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634 return parser.success(exp); |
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635 } |
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636 |
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637 private boolean Minus() { |
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638 parser.begin(); |
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639 return parser.match('-') && !parser.match('-') ? parser.success() : parser.failure(); |
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640 } |
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641 |
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642 private Expressions TermExpr(In in) throws ParseException { |
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643 int start = parser.begin(); |
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644 Expressions exp = UnaryExpr(in); |
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645 if( exp==null ) |
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646 return parser.failure(null); |
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647 while(true) { |
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648 if( parser.match('*') ) { |
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649 Spaces(in); |
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650 Expressions exp2 = UnaryExpr(in); |
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651 exp = new MulExpr( se(start), expr(exp), required(expr(exp2)) ); |
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652 } else if( parser.match('/') ) { |
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653 Spaces(in); |
191
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654 Expressions exp2 = UnaryExpr(in); |
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655 exp = new DivExpr( se(start), expr(exp), required(expr(exp2)) ); |
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656 } else if( Mod() ) { |
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657 Spaces(in); |
191
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658 Expressions exp2 = UnaryExpr(in); |
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659 exp = new ModExpr( se(start), expr(exp), required(expr(exp2)) ); |
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660 } else |
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661 break; |
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662 } |
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663 return parser.success(exp); |
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664 } |
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665 |
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666 private boolean Mod() { |
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667 parser.begin(); |
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668 return parser.match('%') && !parser.match('>') ? parser.success() : parser.failure(); |
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669 } |
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670 |
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671 private Expressions UnaryExpr(In in) throws ParseException { |
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672 int start = parser.begin(); |
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673 if( parser.match('#') ) { |
129
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674 Spaces(in); |
191
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675 Expressions exp = UnaryExpr(in); |
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676 return parser.success( new LenExpr( se(start), required(expr(exp)) ) ); |
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677 } |
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678 if( Minus() ) { |
129
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679 Spaces(in); |
191
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680 Expressions exp = UnaryExpr(in); |
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681 return parser.success( new UnmExpr( se(start), required(expr(exp)) ) ); |
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682 } |
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683 if( Keyword("not",in) ) { |
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684 Spaces(in); |
191
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685 Expressions exp = UnaryExpr(in); |
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686 return parser.success( new NotExpr( se(start), required(expr(exp)) ) ); |
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687 } |
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688 Expressions exp = PowExpr(in); |
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689 if( exp==null ) |
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690 return parser.failure(null); |
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691 return parser.success(exp); |
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692 } |
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693 |
154
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694 private Expressions PowExpr(In in) throws ParseException { |
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695 int start = parser.begin(); |
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696 Expressions exp = SingleExpr(in); |
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697 if( exp==null ) |
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698 return parser.failure(null); |
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699 if( parser.match('^') ) { |
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700 Spaces(in); |
191
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701 Expressions exp2 = PowExpr(in); |
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702 exp = new PowExpr( se(start), expr(exp), required(expr(exp2)) ); |
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703 } |
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704 return parser.success(exp); |
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705 } |
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706 |
154
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707 private Expressions SingleExpr(In in) throws ParseException { |
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708 parser.begin(); |
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709 Expressions exp; |
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710 exp = FunctionExpr(in); |
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711 if( exp != null ) |
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712 return parser.success(exp); |
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713 exp = VarExp(in); |
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714 if( exp != null ) |
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715 return parser.success(exp); |
449 | 716 exp = VarArgs(in); |
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717 if( exp != null ) |
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718 return parser.success(exp); |
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719 return parser.failure(null); |
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720 } |
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721 |
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722 private Expr FunctionExpr(In in) throws ParseException { |
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723 if( !Keyword("function",in) ) |
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724 return null; |
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725 return RequiredFunction(in); |
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726 } |
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727 |
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728 private FnDef RequiredFunction(In in) throws ParseException { |
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729 int start = parser.begin(); |
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730 RequiredMatch('('); |
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731 In inParens = in.parens(); |
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732 Spaces(inParens); |
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733 frame = new Frame(frame); |
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734 List<String> names = NameList(in); |
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735 if( names != null ) { |
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736 addSymbols(names); |
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737 if( parser.match(',') ) { |
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738 Spaces(inParens); |
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739 if( !parser.match("...") ) |
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740 throw parser.exception(); |
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741 Spaces(inParens); |
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742 frame.isVarArg = true; |
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743 } |
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744 } else if( parser.match("...") ) { |
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745 Spaces(inParens); |
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746 frame.isVarArg = true; |
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747 } |
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748 RequiredMatch(')'); |
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749 Spaces(in); |
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750 Stmt block = RequiredBlock(); |
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751 RequiredKeyword("end",in); |
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752 FnDef fnDef = newFnDef(start,block); |
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753 frame = frame.parent; |
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754 return parser.success(fnDef); |
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755 } |
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756 |
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757 private VarArgs VarArgs(In in) throws ParseException { |
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758 int start = parser.begin(); |
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759 if( !frame.isVarArg || !parser.match("...") ) |
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760 return parser.failure(null); |
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761 Spaces(in); |
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762 return parser.success( new VarArgs(se(start)) ); |
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763 } |
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764 |
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765 private Expr TableExpr(In in) throws ParseException { |
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766 int start = parser.begin(); |
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767 if( !parser.match('{') ) |
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768 return parser.failure(null); |
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769 In inParens = in.parens(); |
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770 Spaces(inParens); |
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771 List<TableExpr.Field> fields = new ArrayList<TableExpr.Field>(); |
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772 List<Expressions> builder = new ArrayList<Expressions>(); |
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773 while( Field(fields,builder,inParens) && FieldSep(inParens) ); |
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774 Expressions exp = TemplateExpressions(inParens); |
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775 if( exp != null ) |
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776 builder.add(exp); |
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777 if( !parser.match('}') ) |
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778 throw parser.exception("Expected table element or '}'"); |
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779 Spaces(in); |
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780 return parser.success( new TableExpr( se(start), fields.toArray(new TableExpr.Field[0]), ExpList.build(builder) ) ); |
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781 } |
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782 |
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783 private boolean FieldSep(In in) throws ParseException { |
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784 if( !parser.anyOf(",;") ) |
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785 return false; |
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786 Spaces(in); |
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787 return true; |
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788 } |
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789 |
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790 private boolean Field(List<TableExpr.Field> fields,List<Expressions> builder,In in) throws ParseException { |
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791 parser.begin(); |
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792 Expr exp = SubExpr(in); |
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793 if( exp==null ) |
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794 exp = NameExpr(in); |
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795 if( exp!=null && parser.match('=') ) { |
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796 Spaces(in); |
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797 fields.add( new TableExpr.Field( exp, required(expr(ExprZ(in))) ) ); |
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798 return parser.success(); |
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799 } |
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800 parser.rollback(); |
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801 Expressions exprs = ExprZ(in); |
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802 if( exprs != null ) { |
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803 builder.add(exprs); |
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804 return parser.success(); |
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805 } |
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806 return parser.failure(); |
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807 } |
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808 |
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809 private Expressions VarExp(In in) throws ParseException { |
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810 Var var = VarZ(in); |
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811 return var==null ? null : var.expr(); |
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812 } |
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813 |
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814 private Var VarZ(In in) throws ParseException { |
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815 int start = parser.begin(); |
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816 Var var = VarStart(in,start); |
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817 if( var==null ) |
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818 return parser.failure(null); |
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819 Var var2; |
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820 while( (var2=Var2(in,start,var.expr())) != null ) { |
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821 var = var2; |
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822 } |
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823 return parser.success(var); |
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824 } |
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825 |
206
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826 private Var VarStart(In in,int start) throws ParseException { |
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827 if( parser.match('(') ) { |
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828 In inParens = in.parens(); |
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829 Spaces(inParens); |
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830 Expr exp = expr(RequiredExpr(inParens)); |
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831 RequiredMatch(')'); |
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832 Spaces(in); |
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833 return exprVar(exp); |
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834 } |
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835 String name = Name(in); |
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836 if( name != null ) |
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837 return nameVar(start,name); |
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838 Expressions exp; |
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839 exp = TableExpr(in); |
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840 if( exp != null ) |
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841 return exprVar(exp); |
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842 exp = Literal(in); |
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843 if( exp != null ) |
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844 return exprVar(exp); |
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845 return null; |
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846 } |
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847 |
206
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848 private Var Var2(In in,int start,Expressions exp1) throws ParseException { |
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849 parser.begin(); |
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850 Expr exp2 = SubExpr(in); |
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851 if( exp2 != null ) |
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852 return parser.success(indexVar(start,expr(exp1),exp2)); |
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853 if( parser.match('.') ) { |
129
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854 Spaces(in); |
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855 exp2 = NameExpr(in); |
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856 if( exp2!=null ) |
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857 return parser.success(indexVar(start,expr(exp1),exp2)); |
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858 } |
206
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859 FnCall fnCall = Args( in, start, expr(exp1), new ArrayList<Expressions>() ); |
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860 if( fnCall != null ) |
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861 return parser.success(exprVar(fnCall)); |
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862 return parser.failure(null); |
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863 } |
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864 |
503 | 865 private interface Var { |
866 public Expressions expr() throws ParseException; | |
867 public Settable settable() throws ParseException; | |
868 } | |
869 | |
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870 private Expr env() { |
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871 int index = stackIndex(_ENV); |
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872 if( index != -1 ) |
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873 return new GetLocalVar(null,index); |
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874 index = upValueIndex(_ENV); |
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875 if( index != -1 ) |
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876 return new GetUpVar(null,index); |
503 | 877 return null; |
104
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878 } |
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879 |
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880 private Var nameVar(final int start,final String name) { |
190
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881 return nameVar(se(start,name),name); |
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882 } |
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883 |
460 | 884 private Var nameVar(final LuanElement se,final String name) { |
104
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885 return new Var() { |
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886 |
503 | 887 public Expr expr() throws ParseException { |
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888 int index = stackIndex(name); |
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889 if( index != -1 ) |
157
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890 return new GetLocalVar(se,index); |
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891 index = upValueIndex(name); |
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892 if( index != -1 ) |
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893 return new GetUpVar(se,index); |
503 | 894 Expr envExpr = env(); |
895 if( envExpr != null ) | |
896 return new IndexExpr( se, envExpr, new ConstExpr(se,name) ); | |
897 parser.failure(null); | |
898 throw parser.exception("name '"+name+"' not defined"); | |
104
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899 } |
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900 |
503 | 901 public Settable settable() throws ParseException { |
104
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902 int index = stackIndex(name); |
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903 if( index != -1 ) |
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904 return new SetLocalVar(index); |
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905 index = upValueIndex(name); |
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906 if( index != -1 ) |
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907 return new SetUpVar(index); |
503 | 908 Expr envExpr = env(); |
909 if( envExpr != null ) | |
910 return new SetTableEntry( se, envExpr, new ConstExpr(se,name) ); | |
911 parser.failure(null); | |
912 throw parser.exception("name '"+name+"' not defined"); | |
104
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913 } |
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914 }; |
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915 } |
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916 |
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917 private Var exprVar(final Expressions expr) { |
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918 return new Var() { |
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919 |
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920 public Expressions expr() { |
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921 return expr; |
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922 } |
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923 |
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924 public Settable settable() { |
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925 return null; |
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926 } |
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927 }; |
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928 } |
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929 |
104
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930 private Var indexVar(final int start,final Expr table,final Expr key) { |
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931 return new Var() { |
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932 |
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933 public Expr expr() { |
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934 return new IndexExpr( se(start), table, key ); |
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935 } |
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936 |
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937 public Settable settable() { |
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938 return new SetTableEntry(se(start),table,key); |
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939 } |
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940 }; |
9
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941 } |
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942 |
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943 private FnCall Args(In in,int start,Expr fn,List<Expressions> builder) throws ParseException { |
104
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944 parser.begin(); |
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945 return args(in,builder) |
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946 ? parser.success( new FnCall( se(start), fn, ExpList.build(builder) ) ) |
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947 : parser.failure((FnCall)null); |
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948 } |
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949 |
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950 private boolean args(In in,List<Expressions> builder) throws ParseException { |
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951 int start = parser.begin(); |
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952 if( parser.match('(') ) { |
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953 In inParens = in.parens(); |
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954 Spaces(inParens); |
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955 ExpList(inParens,builder); // optional |
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956 if( !parser.match(')') ) |
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957 throw parser.exception("Expression or ')' expected"); |
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958 Spaces(in); |
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959 return parser.success(); |
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960 } |
129
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961 Expr exp = TableExpr(in); |
107
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962 if( exp != null ) { |
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963 builder.add(exp); |
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964 return parser.success(); |
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965 } |
129
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966 String s = StringLiteral(in); |
107
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967 if( s != null ) { |
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968 builder.add( new ConstExpr(se(start),s) ); |
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969 return parser.success(); |
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970 } |
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971 /* |
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972 Expressions exps = TemplateExpressions(in); |
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973 if( exps != null ) { |
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974 builder.add(exps); |
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975 return parser.success(); |
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976 } |
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977 */ |
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978 return parser.failure(); |
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979 } |
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980 |
129
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981 private Expressions ExpList(In in) throws ParseException { |
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982 List<Expressions> builder = new ArrayList<Expressions>(); |
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983 return ExpList(in,builder) ? ExpList.build(builder) : null; |
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984 } |
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985 |
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986 private boolean ExpList(In in,List<Expressions> builder) throws ParseException { |
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987 parser.begin(); |
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988 Expressions exp = TemplateExpressions(in); |
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989 if( exp != null ) { |
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990 builder.add(exp); |
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991 return parser.success(); |
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992 } |
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993 exp = ExprZ(in); |
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994 if( exp==null ) |
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995 return parser.failure(); |
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996 builder.add(exp); |
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997 while( parser.match(',') ) { |
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998 Spaces(in); |
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999 exp = TemplateExpressions(in); |
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1000 if( exp != null ) { |
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1001 builder.add(exp); |
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1002 return parser.success(); |
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1003 } |
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1004 builder.add( RequiredExpr(in) ); |
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1005 } |
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1006 return parser.success(); |
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1007 } |
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1008 |
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1009 private Expr SubExpr(In in) throws ParseException { |
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1010 parser.begin(); |
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1011 if( !parser.match('[') || parser.test("[") || parser.test("=") ) |
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1012 return parser.failure(null); |
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1013 In inParens = in.parens(); |
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1014 Spaces(inParens); |
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1015 Expr exp = expr(RequiredExpr(inParens)); |
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1016 RequiredMatch(']'); |
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1017 Spaces(in); |
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1018 return parser.success(exp); |
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1019 } |
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1020 |
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1021 private Expr NameExpr(In in) throws ParseException { |
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1022 int start = parser.begin(); |
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1023 String name = Name(in); |
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1024 if( name==null ) |
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1025 return parser.failure(null); |
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1026 return parser.success(new ConstExpr(se(start),name)); |
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1027 } |
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1028 |
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1029 private String RequiredName(In in) throws ParseException { |
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1030 parser.begin(); |
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1031 String name = Name(in); |
104
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1032 if( name==null ) |
139
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1033 throw parser.exception("Name expected"); |
104
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1034 return parser.success(name); |
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1035 } |
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1036 |
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1037 private String Name(In in) throws ParseException { |
104
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1038 int start = parser.begin(); |
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1039 if( !NameFirstChar() ) |
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1040 return parser.failure(null); |
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1041 while( NameChar() ); |
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1042 String match = parser.textFrom(start); |
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1043 if( keywords.contains(match) ) |
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1044 return parser.failure(null); |
129
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1045 Spaces(in); |
104
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1046 return parser.success(match); |
17
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1047 } |
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1048 |
104
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1049 private boolean NameChar() { |
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1050 return NameFirstChar() || Digit(); |
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1051 } |
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1052 |
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1053 private boolean NameFirstChar() { |
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1054 return parser.inCharRange('a', 'z') || parser.inCharRange('A', 'Z') || parser.match('_'); |
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1055 } |
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1056 |
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1057 private void RequiredMatch(char c) throws ParseException { |
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1058 if( !parser.match(c) ) |
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1059 throw parser.exception("'"+c+"' expected"); |
9
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1060 } |
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1061 |
104
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1062 private void RequiredMatch(String s) throws ParseException { |
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1063 if( !parser.match(s) ) |
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1064 throw parser.exception("'"+s+"' expected"); |
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1065 } |
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1066 |
129
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1067 private void RequiredKeyword(String keyword,In in) throws ParseException { |
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1068 if( !Keyword(keyword,in) ) |
104
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1069 throw parser.exception("'"+keyword+"' expected"); |
9
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1070 } |
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1071 |
129
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1072 private boolean Keyword(String keyword,In in) throws ParseException { |
104
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1073 parser.begin(); |
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1074 if( !parser.match(keyword) || NameChar() ) |
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1075 return parser.failure(); |
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1076 Spaces(in); |
104
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1077 return parser.success(); |
12
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1078 } |
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1079 |
104
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1080 private static final Set<String> keywords = new HashSet<String>(Arrays.asList( |
12
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1081 "and", |
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1082 "break", |
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1083 "do", |
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1084 "else", |
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1085 "elseif", |
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1086 "end", |
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1087 "false", |
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1088 "for", |
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1089 "function", |
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1090 "goto", |
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1091 "if", |
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1092 "in", |
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1093 "local", |
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1094 "nil", |
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1095 "not", |
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1096 "or", |
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1097 "repeat", |
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1098 "return", |
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1099 "then", |
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1100 "true", |
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1101 "until", |
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1102 "while" |
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1103 )); |
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1104 |
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1105 private Expr Literal(In in) throws ParseException { |
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1106 int start = parser.begin(); |
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1107 if( NilLiteral(in) ) |
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1108 return parser.success(new ConstExpr(se(start),null)); |
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1109 Boolean b = BooleanLiteral(in); |
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1110 if( b != null ) |
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1111 return parser.success(new ConstExpr(se(start),b)); |
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1112 Number n = NumberLiteral(in); |
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1113 if( n != null ) |
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1114 return parser.success(new ConstExpr(se(start),n)); |
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1115 String s = StringLiteral(in); |
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1116 if( s != null ) |
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1117 return parser.success(new ConstExpr(se(start),s)); |
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1118 return parser.failure(null); |
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1119 } |
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1120 |
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1121 private boolean NilLiteral(In in) throws ParseException { |
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1122 return Keyword("nil",in); |
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1123 } |
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1124 |
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1125 private Boolean BooleanLiteral(In in) throws ParseException { |
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1126 if( Keyword("true",in) ) |
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1127 return true; |
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1128 if( Keyword("false",in) ) |
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1129 return false; |
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1130 return null; |
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1131 } |
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1132 |
129
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1133 private Number NumberLiteral(In in) throws ParseException { |
104
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1134 parser.begin(); |
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1135 Number n; |
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1136 if( parser.matchIgnoreCase("0x") ) { |
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1137 n = HexNumber(); |
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1138 } else { |
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1139 n = DecNumber(); |
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1140 } |
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1141 if( n==null || NameChar() ) |
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1142 return parser.failure(null); |
129
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1143 Spaces(in); |
104
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1144 return parser.success(n); |
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1145 } |
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1146 |
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1147 private Number DecNumber() { |
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1148 int start = parser.begin(); |
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1149 if( Int() ) { |
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1150 if( parser.match('.') ) |
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1151 Int(); // optional |
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1152 } else if( parser.match('.') && Int() ) { |
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1153 // ok |
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1154 } else |
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1155 return parser.failure(null); |
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1156 Exponent(); // optional |
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1157 return parser.success(Double.valueOf(parser.textFrom(start))); |
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1158 } |
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1159 |
104
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1160 private boolean Exponent() { |
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1161 parser.begin(); |
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1162 if( !parser.matchIgnoreCase("e") ) |
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1163 return parser.failure(); |
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1164 parser.anyOf("+-"); // optional |
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1165 if( !Int() ) |
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1166 return parser.failure(); |
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1167 return parser.success(); |
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1168 } |
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1169 |
104
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1170 private boolean Int() { |
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1171 if( !Digit() ) |
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1172 return false; |
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1173 while( Digit() ); |
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1174 return true; |
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1175 } |
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1176 |
104
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1177 private boolean Digit() { |
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1178 return parser.inCharRange('0', '9'); |
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1179 } |
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1180 |
104
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1181 private Number HexNumber() { |
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1182 int start = parser.begin(); |
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1183 double n; |
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1184 if( HexInt() ) { |
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1185 n = (double)Long.parseLong(parser.textFrom(start),16); |
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1186 if( parser.match('.') ) { |
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1187 start = parser.currentIndex(); |
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1188 if( HexInt() ) { |
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1189 String dec = parser.textFrom(start); |
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1190 n += (double)Long.parseLong(dec,16) / Math.pow(16,dec.length()); |
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1191 } |
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1192 } |
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1193 } else if( parser.match('.') && HexInt() ) { |
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1194 String dec = parser.textFrom(start+1); |
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1195 n = (double)Long.parseLong(dec,16) / Math.pow(16,dec.length()); |
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1196 } else { |
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1197 return parser.failure(null); |
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1198 } |
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1199 if( parser.matchIgnoreCase("p") ) { |
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1200 parser.anyOf("+-"); // optional |
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1201 start = parser.currentIndex(); |
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1202 if( !HexInt() ) |
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1203 return parser.failure(null); |
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1204 n *= Math.pow(2,(double)Long.parseLong(parser.textFrom(start))); |
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1205 } |
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1206 return parser.success(Double.valueOf(n)); |
16
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1207 } |
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1208 |
104
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1209 private boolean HexInt() { |
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1210 if( !HexDigit() ) |
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1211 return false; |
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1212 while( HexDigit() ); |
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1213 return true; |
16
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1214 } |
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1215 |
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1216 |
104
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1217 private boolean HexDigit() { |
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1218 return Digit() || parser.anyOf("abcdefABCDEF"); |
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1219 } |
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1220 |
129
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1221 private String StringLiteral(In in) throws ParseException { |
104
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1222 String s; |
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1223 if( (s=QuotedString('"'))==null |
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1224 && (s=QuotedString('\''))==null |
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1225 && (s=LongString())==null |
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1226 ) |
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1227 return null; |
129
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1228 Spaces(in); |
104
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1229 return s; |
16
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1230 } |
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1231 |
104
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1232 private String LongString() throws ParseException { |
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1233 parser.begin(); |
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1234 if( !parser.match('[') ) |
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1235 return parser.failure(null); |
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1236 int start = parser.currentIndex(); |
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1237 while( parser.match('=') ); |
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1238 int nEquals = parser.currentIndex() - start; |
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1239 if( !parser.match('[') ) |
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1240 return parser.failure(null); |
120
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1241 EndOfLine(); |
104
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1242 start = parser.currentIndex(); |
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1243 while( !LongBracketsEnd(nEquals) ) { |
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1244 if( !parser.anyChar() ) |
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1245 throw parser.exception("Unclosed long string"); |
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1246 } |
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1247 String s = parser.text.substring( start, parser.currentIndex() - nEquals - 2 ); |
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1248 return parser.success(s); |
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1249 } |
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1250 |
104
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1251 private String QuotedString(char quote) throws ParseException { |
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1252 parser.begin(); |
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1253 if( !parser.match(quote) ) |
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1254 return parser.failure(null); |
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1255 StringBuilder buf = new StringBuilder(); |
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1256 while( !parser.match(quote) ) { |
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1257 Character c = EscSeq(); |
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1258 if( c != null ) { |
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1259 buf.append(c); |
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1260 } else { |
271
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1261 if( parser.test('\r') || parser.test('\n') || !parser.anyChar() ) |
104
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1262 throw parser.exception("Unclosed string"); |
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1263 buf.append(parser.lastChar()); |
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1264 } |
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1265 } |
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1266 return parser.success(buf.toString()); |
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1267 } |
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1268 |
104
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1269 private Character EscSeq() { |
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1270 parser.begin(); |
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1271 if( !parser.match('\\') ) |
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1272 return parser.failure(null); |
155
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1273 if( parser.match('a') ) return parser.success('\u0007'); |
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1274 if( parser.match('b') ) return parser.success('\b'); |
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1275 if( parser.match('f') ) return parser.success('\f'); |
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1276 if( parser.match('n') ) return parser.success('\n'); |
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1277 if( parser.match('r') ) return parser.success('\r'); |
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1278 if( parser.match('t') ) return parser.success('\t'); |
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1279 if( parser.match('v') ) return parser.success('\u000b'); |
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1280 if( parser.match('\\') ) return parser.success('\\'); |
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1281 if( parser.match('"') ) return parser.success('"'); |
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1282 if( parser.match('\'') ) return parser.success('\''); |
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1283 int start = parser.currentIndex(); |
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1284 if( parser.match('x') && HexDigit() && HexDigit() ) |
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1285 return parser.success((char)Integer.parseInt(parser.textFrom(start+1),16)); |
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1286 if( Digit() ) { |
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1287 if( Digit() ) Digit(); // optional |
155
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1288 return parser.success((char)Integer.parseInt(parser.textFrom(start))); |
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1289 } |
271
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1290 if( EndOfLine() ) |
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1291 return parser.success('\n'); |
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1292 return parser.failure(null); |
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1293 } |
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1294 |
129
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1295 private void Spaces(In in) throws ParseException { |
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1296 while( parser.anyOf(" \t") || Comment() || ContinueOnNextLine() || in.parens && EndOfLine() ); |
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1297 } |
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1298 |
104
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1299 private boolean ContinueOnNextLine() { |
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1300 parser.begin(); |
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1301 return parser.match('\\') && EndOfLine() ? parser.success() : parser.failure(); |
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1302 } |
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1303 |
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1304 private boolean Comment() throws ParseException { |
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1305 if( LongComment() ) |
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1306 return true; |
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1307 if( parser.match("--") ) { |
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1308 while( parser.noneOf("\r\n") ); |
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1309 return true; |
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1310 } |
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1311 return false; |
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1312 } |
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1313 |
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1314 private boolean LongComment() throws ParseException { |
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1315 parser.begin(); |
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1316 if( !parser.match("--[") ) |
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1317 return parser.failure(); |
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1318 int start = parser.currentIndex(); |
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1319 while( parser.match('=') ); |
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1320 int nEquals = parser.currentIndex() - start; |
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1321 if( !parser.match('[') ) |
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1322 return parser.failure(); |
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1323 while( !LongBracketsEnd(nEquals) ) { |
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1324 if( !parser.anyChar() ) |
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1325 throw parser.exception("Unclosed comment"); |
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1326 } |
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1327 return parser.success(); |
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1328 } |
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1329 |
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1330 private boolean LongBracketsEnd(int nEquals) { |
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1331 parser.begin(); |
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1332 if( !parser.match(']') ) |
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1333 return parser.failure(); |
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1334 while( nEquals-- > 0 ) { |
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1335 if( !parser.match('=') ) |
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1336 return parser.failure(); |
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1337 } |
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1338 if( !parser.match(']') ) |
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1339 return parser.failure(); |
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1340 return parser.success(); |
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1341 } |
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1342 |
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1343 } |