Mercurial Hosting > luan
annotate src/luan/interp/LuaParser.java @ 11:b7d7069fee58
add assignment statement and CmdLine
git-svn-id: https://luan-java.googlecode.com/svn/trunk@12 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Thu, 22 Nov 2012 10:51:56 +0000 |
parents | 600676034a1a |
children | 9cea1aea5eef |
rev | line source |
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5
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1 package luan.interp; |
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2 |
9
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3 import java.util.List; |
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4 import java.util.ArrayList; |
5
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5 import java.util.Scanner; |
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6 import org.parboiled.BaseParser; |
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7 import org.parboiled.Parboiled; |
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8 import org.parboiled.Rule; |
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9 import org.parboiled.parserunners.ReportingParseRunner; |
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10 import org.parboiled.support.ParsingResult; |
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11 import org.parboiled.errors.ErrorUtils; |
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12 import luan.Lua; |
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13 import luan.LuaNumber; |
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14 import luan.LuaState; |
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15 |
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16 |
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17 public class LuaParser extends BaseParser<Object> { |
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18 |
11
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19 public Rule Target() { |
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20 return Sequence( |
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21 Spaces(), |
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22 FirstOf( |
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23 Sequence( Expressions(), EOI ), |
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24 Sequence( Stmt(), EOI ) |
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25 ) |
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26 ); |
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27 } |
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28 |
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29 Rule Stmt() { |
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30 return SetStmt(); |
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31 } |
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32 |
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33 Rule SetStmt() { |
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34 return Sequence( |
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35 VarList(), |
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36 '=', Spaces(), |
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37 ExpList(), |
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38 push( newSetStmt() ) |
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39 ); |
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40 } |
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41 |
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42 SetStmt newSetStmt() { |
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43 Expressions values = (Expressions)pop(); |
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44 @SuppressWarnings("unchecked") |
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45 List<SetStmt.Var> vars = (List<SetStmt.Var>)pop(); |
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46 return new SetStmt( vars.toArray(new SetStmt.Var[0]), values ); |
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47 } |
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48 |
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49 Rule VarList() { |
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50 return Sequence( |
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51 push(new ArrayList<SetStmt.Var>()), |
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52 Var(), |
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53 addToVarList(), |
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54 ZeroOrMore( |
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55 ',', Spaces(), Var(), |
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56 addToVarList() |
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57 ) |
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58 ); |
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59 } |
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60 |
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61 boolean addToVarList() { |
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62 Object obj = pop(); |
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63 if( obj==null ) |
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64 return false; |
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65 Expr key = expr(obj); |
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66 Expr table = expr(pop()); |
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67 @SuppressWarnings("unchecked") |
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68 List<SetStmt.Var> vars = (List<SetStmt.Var>)peek(); |
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69 vars.add( new SetStmt.Var(table,key) ); |
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70 return true; |
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71 } |
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72 |
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73 Rule Expr() { |
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74 return OrExpr(); |
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75 } |
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76 |
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77 Rule OrExpr() { |
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78 return Sequence( |
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79 AndExpr(), |
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80 ZeroOrMore( "or", Spaces(), AndExpr(), push( new OrExpr(expr(pop(1)),expr(pop())) ) ) |
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81 ); |
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82 } |
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83 |
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84 Rule AndExpr() { |
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85 return Sequence( |
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86 RelExpr(), |
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87 ZeroOrMore( "and", Spaces(), RelExpr(), push( new AndExpr(expr(pop(1)),expr(pop())) ) ) |
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88 ); |
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89 } |
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90 |
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91 Rule RelExpr() { |
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92 return Sequence( |
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93 ConcatExpr(), |
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94 ZeroOrMore( |
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95 FirstOf( |
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96 Sequence( "==", Spaces(), ConcatExpr(), push( new EqExpr(expr(pop(1)),expr(pop())) ) ), |
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97 Sequence( "~=", Spaces(), ConcatExpr(), push( new NotExpr(new EqExpr(expr(pop(1)),expr(pop()))) ) ), |
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98 Sequence( "<=", Spaces(), ConcatExpr(), push( new LeExpr(expr(pop(1)),expr(pop())) ) ), |
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99 Sequence( ">=", Spaces(), ConcatExpr(), push( new LeExpr(expr(pop()),expr(pop())) ) ), |
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100 Sequence( "<", Spaces(), ConcatExpr(), push( new LtExpr(expr(pop(1)),expr(pop())) ) ), |
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101 Sequence( ">", Spaces(), ConcatExpr(), push( new LtExpr(expr(pop()),expr(pop())) ) ) |
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102 ) |
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103 ) |
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104 ); |
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105 } |
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106 |
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107 Rule ConcatExpr() { |
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108 return Sequence( |
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109 SumExpr(), |
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110 Optional( "..", Spaces(), ConcatExpr(), push( new ConcatExpr(expr(pop(1)),expr(pop())) ) ) |
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111 ); |
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112 } |
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113 |
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114 Rule SumExpr() { |
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115 return Sequence( |
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116 TermExpr(), |
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117 ZeroOrMore( |
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118 FirstOf( |
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119 Sequence( '+', Spaces(), TermExpr(), push( new AddExpr(expr(pop(1)),expr(pop())) ) ), |
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120 Sequence( '-', Spaces(), TermExpr(), push( new SubExpr(expr(pop(1)),expr(pop())) ) ) |
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121 ) |
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122 ) |
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123 ); |
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124 } |
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125 |
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126 Rule TermExpr() { |
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127 return Sequence( |
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128 UnaryExpr(), |
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129 ZeroOrMore( |
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130 FirstOf( |
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131 Sequence( '*', Spaces(), UnaryExpr(), push( new MulExpr(expr(pop(1)),expr(pop())) ) ), |
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132 Sequence( '/', Spaces(), UnaryExpr(), push( new DivExpr(expr(pop(1)),expr(pop())) ) ), |
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133 Sequence( '%', Spaces(), UnaryExpr(), push( new ModExpr(expr(pop(1)),expr(pop())) ) ) |
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134 ) |
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135 ) |
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136 ); |
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137 } |
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138 |
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139 Rule UnaryExpr() { |
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140 return FirstOf( |
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141 Sequence( '#', Spaces(), PowExpr(), push( new LenExpr(expr(pop())) ) ), |
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142 Sequence( '-', Spaces(), PowExpr(), push( new UnmExpr(expr(pop())) ) ), |
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143 Sequence( "not", Spaces(), PowExpr(), push( new NotExpr(expr(pop())) ) ), |
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144 PowExpr() |
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145 ); |
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146 } |
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147 |
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148 Rule PowExpr() { |
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149 return Sequence( |
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150 SingleExpr(), |
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151 Optional( '^', Spaces(), PowExpr(), push( new PowExpr(expr(pop(1)),expr(pop())) ) ) |
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152 ); |
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153 } |
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154 |
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155 Rule SingleExpr() { |
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156 return FirstOf( |
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157 TableExpr(), |
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158 VarExp(), |
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159 LiteralExpr() |
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160 ); |
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161 } |
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162 |
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163 Rule TableExpr() { |
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164 return Sequence( |
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165 '{', Spaces(), |
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166 push( new ArrayList<TableExpr.Field>() ), |
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167 push( 1.0 ), // counter |
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168 Optional( |
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169 Field(), |
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170 ZeroOrMore( |
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171 FieldSep(), |
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172 Field() |
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173 ), |
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174 Optional( FieldSep() ) |
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175 ), |
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176 '}', Spaces(), |
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177 push( newTableExpr() ) |
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178 ); |
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179 } |
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180 |
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181 TableExpr newTableExpr() { |
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182 pop(); // counter |
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183 @SuppressWarnings("unchecked") |
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184 List<TableExpr.Field> list = (List<TableExpr.Field>)pop(); |
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185 return new TableExpr(list.toArray(new TableExpr.Field[0])); |
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186 } |
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187 |
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188 Rule FieldSep() { |
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189 return Sequence( AnyOf(",;"), Spaces() ); |
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190 } |
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191 |
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192 Rule Field() { |
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193 return FirstOf( |
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194 Sequence( |
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195 FirstOf( SubExpr(), Name() ), |
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196 '=', Spaces(), Expr(), |
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197 addField() |
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198 ), |
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199 Sequence( |
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200 Expr(), |
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201 addIndexedField() |
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202 ) |
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203 ); |
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204 } |
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205 |
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206 boolean addField() { |
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207 TableExpr.Field field = new TableExpr.Field( expr(pop(1)), expr(pop()) ); |
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208 @SuppressWarnings("unchecked") |
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209 List<TableExpr.Field> list = (List<TableExpr.Field>)peek(1); |
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210 list.add(field); |
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211 return true; |
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212 } |
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213 |
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214 boolean addIndexedField() { |
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215 Expr val = expr(pop()); |
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216 double i = (Double)pop(); |
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217 TableExpr.Field field = new TableExpr.Field( new ConstExpr(new LuaNumber(i)), val ); |
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218 push( i + 1 ); |
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219 @SuppressWarnings("unchecked") |
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220 List<TableExpr.Field> list = (List<TableExpr.Field>)peek(1); |
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221 list.add(field); |
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222 return true; |
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223 } |
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224 |
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225 static Expr expr(Object obj) { |
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226 if( obj instanceof Expressions ) |
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227 return new ExpressionsExpr((Expressions)obj); |
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228 return (Expr)obj; |
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229 } |
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230 |
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231 Rule VarExp() { |
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232 return Sequence( |
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233 Var(), |
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234 makeVarExp() |
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235 ); |
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236 } |
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237 |
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238 Rule Var() { |
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239 return Sequence( |
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240 FirstOf( |
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241 Sequence( |
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242 '(', Spaces(), Expr(), ')', Spaces(), |
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243 push(expr(pop())), |
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244 push(null) // marker |
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245 ), |
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246 Sequence( |
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247 push(EnvExpr.INSTANCE), |
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248 Name() |
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249 ) |
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250 ), |
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251 ZeroOrMore( |
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252 makeVarExp(), |
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253 FirstOf( |
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254 SubExpr(), |
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255 Sequence( '.', Spaces(), Name() ), |
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256 Sequence( |
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257 Args(), |
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258 push(null) // marker |
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259 ) |
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260 ) |
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261 ) |
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262 ); |
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263 } |
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264 |
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265 boolean makeVarExp() { |
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266 Object obj = pop(); |
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267 if( obj==null ) |
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268 return true; |
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269 return push( new GetExpr( expr(pop()), expr(obj) ) ); |
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270 } |
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271 |
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272 // function should be on top of the stack |
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273 Rule Args() { |
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274 return Sequence( |
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275 FirstOf( |
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276 Sequence( |
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277 '(', Spaces(), Expressions(), ')', Spaces() |
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278 ), |
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279 Sequence( |
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280 TableExpr(), |
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281 push( new ExpList.SingleExpList(expr(pop())) ) |
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282 ), |
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283 Sequence( |
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284 StringLiteral(), Spaces(), |
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285 push( new ExpList.SingleExpList(new ConstExpr(pop())) ) |
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286 ) |
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287 ), |
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288 push( new FnCall( expr(pop(1)), (Expressions)pop() ) ) |
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289 ); |
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290 } |
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291 |
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292 Rule Expressions() { |
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293 return FirstOf( |
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294 ExpList(), |
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295 push( ExpList.emptyExpList ) |
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296 ); |
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297 } |
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298 |
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299 Rule ExpList() { |
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300 return Sequence( |
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301 push(new ExpList.Builder()), |
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302 Expr(), |
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303 addToExpList(), |
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304 ZeroOrMore( |
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305 ',', Spaces(), Expr(), |
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306 addToExpList() |
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307 ), |
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308 push( ((ExpList.Builder)pop()).build() ) |
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309 ); |
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310 } |
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311 |
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312 boolean addToExpList() { |
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313 Object obj = pop(); |
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314 ExpList.Builder bld = (ExpList.Builder)peek(); |
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315 if( obj instanceof Expressions ) { |
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316 bld.add( (Expressions)obj ); |
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317 } else { |
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318 bld.add( (Expr)obj ); |
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319 } |
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320 return true; |
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321 } |
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322 |
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323 Rule SubExpr() { |
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324 return Sequence( '[', Spaces(), Expr(), ']', Spaces() ); |
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325 } |
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326 |
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327 Rule Name() { |
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328 return Sequence( |
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329 Sequence( |
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330 NameStart(), |
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331 ZeroOrMore( |
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332 FirstOf( NameStart(), Digit() ) |
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333 ) |
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334 ), |
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335 push( new ConstExpr(match()) ), |
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336 Spaces() |
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337 ); |
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338 } |
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339 |
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340 Rule NameStart() { |
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341 return FirstOf( |
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342 CharRange('a', 'z'), |
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343 CharRange('A', 'Z'), |
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344 '_' |
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345 ); |
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346 } |
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347 |
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348 Rule LiteralExpr() { |
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349 return Sequence( |
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350 Literal(), Spaces(), |
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351 push(new ConstExpr(pop())) |
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352 ); |
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353 } |
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354 |
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355 Rule Literal() { |
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356 return FirstOf( |
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357 NilLiteral(), |
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358 BooleanLiteral(), |
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359 NumberLiteral(), |
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360 StringLiteral() |
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361 ); |
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362 } |
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363 |
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364 Rule NilLiteral() { |
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365 return Sequence( "nil", push(null) ); |
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366 } |
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367 |
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368 Rule BooleanLiteral() { |
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369 return FirstOf( |
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370 Sequence( "true", push(true) ), |
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371 Sequence( "false", push(false) ) |
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372 ); |
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373 } |
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374 |
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375 Rule NumberLiteral() { |
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376 return Sequence( |
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377 Number(), |
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378 push(new LuaNumber((Double)pop())) |
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379 ); |
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380 } |
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381 |
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382 Rule Number() { |
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383 return FirstOf( |
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384 Sequence( |
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385 IgnoreCase("0x"), |
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386 OneOrMore(HexDigit()), |
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387 push((double)Long.parseLong(match(),16)) |
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388 ), |
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389 Sequence( |
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390 DecNumber(), |
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391 push(Double.parseDouble(match())) |
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392 ) |
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393 ); |
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394 } |
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395 |
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396 Rule DecNumber() { |
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397 return FirstOf( |
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398 Sequence( |
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399 Int(), |
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400 Optional( '.', Optional(Int()) ), |
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401 Exponent() |
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402 ), |
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403 Sequence( '.', Int(), Exponent() ) |
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404 ); |
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405 } |
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406 |
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407 Rule Exponent() { |
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408 return Optional( |
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409 IgnoreCase('e'), |
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410 Optional(AnyOf("+-")), |
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411 Int() |
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412 ); |
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413 } |
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414 |
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415 Rule Int() { |
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416 return OneOrMore(Digit()); |
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417 } |
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418 |
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419 Rule HexDigit() { |
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420 return FirstOf( |
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421 Digit(), |
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422 AnyOf("abcdefABCDEF") |
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423 ); |
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424 } |
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425 |
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426 Rule Digit() { |
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427 return CharRange('0', '9'); |
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428 } |
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429 |
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430 Rule StringLiteral() { |
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431 return FirstOf( |
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432 QuotedString('"'), |
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433 QuotedString('\'') |
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434 ); |
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435 } |
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436 |
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437 Rule QuotedString(char quote) { |
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438 return Sequence( |
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439 quote, |
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440 push(new StringBuffer()), |
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441 ZeroOrMore( |
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442 FirstOf( |
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443 Sequence( |
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444 NoneOf("\\\n"+quote), |
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445 append(matchedChar()) |
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446 ), |
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447 EscSeq() |
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448 ) |
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449 ), |
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450 quote, |
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451 push(((StringBuffer)pop()).toString()) |
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452 ); |
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453 } |
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454 |
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455 Rule EscSeq() { |
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456 return Sequence( |
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457 '\\', |
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458 FirstOf( |
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459 Sequence( 'a', append('\u0007') ), |
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460 Sequence( 'b', append('\b') ), |
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461 Sequence( 'f', append('\f') ), |
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462 Sequence( 'n', append('\n') ), |
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463 Sequence( 'r', append('\r') ), |
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464 Sequence( 't', append('\t') ), |
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465 Sequence( 'v', append('\u000b') ), |
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466 Sequence( '\\', append('\\') ), |
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467 Sequence( '"', append('"') ), |
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468 Sequence( '\'', append('\'') ), |
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469 Sequence( |
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470 'x', |
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471 Sequence( HexDigit(), HexDigit() ), |
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472 append( (char)Integer.parseInt(match(),16) ) |
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473 ), |
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474 Sequence( |
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475 Sequence( |
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476 Digit(), |
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477 Optional( |
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478 Digit(), |
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479 Optional( |
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480 Digit() |
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481 ) |
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482 ) |
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483 ), |
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484 append( (char)Integer.parseInt(match()) ) |
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485 ) |
6
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486 ) |
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487 ); |
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488 } |
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489 |
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490 boolean append(char ch) { |
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491 StringBuffer sb = (StringBuffer)peek(); |
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492 sb.append(ch); |
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493 return true; |
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494 } |
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495 |
7
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496 public Rule Spaces() { |
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497 return ZeroOrMore(AnyOf(" \t")); |
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498 } |
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499 |
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500 // for testing |
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501 public static void main(String[] args) throws Exception { |
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502 LuaParser parser = Parboiled.createParser(LuaParser.class); |
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503 while( true ) { |
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504 String input = new Scanner(System.in).nextLine(); |
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505 ParsingResult<?> result = new ReportingParseRunner(parser.Target()).run(input); |
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506 if( result.hasErrors() ) { |
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507 System.out.println("Parse Errors:\n" + ErrorUtils.printParseErrors(result)); |
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508 } else { |
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509 Expr expr = expr(result.resultValue); |
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510 LuaState lua = new LuaState(); |
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511 Object val = expr.eval(lua); |
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512 System.out.println("Result: "+Lua.toString(val)); |
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513 } |
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514 } |
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515 } |
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516 } |