Mercurial Hosting > luan
annotate src/luan/interp/LuaParser.java @ 8:8896068e0a4b
finish operators
git-svn-id: https://luan-java.googlecode.com/svn/trunk@9 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Wed, 21 Nov 2012 06:57:09 +0000 |
parents | bca8fc5d928b |
children | 600676034a1a |
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5
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1 package luan.interp; |
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2 |
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3 import java.util.Scanner; |
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4 import org.parboiled.BaseParser; |
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5 import org.parboiled.Parboiled; |
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6 import org.parboiled.Rule; |
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7 import org.parboiled.parserunners.ReportingParseRunner; |
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8 import org.parboiled.support.ParsingResult; |
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9 import org.parboiled.errors.ErrorUtils; |
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10 import luan.Lua; |
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11 import luan.LuaNumber; |
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12 import luan.LuaState; |
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13 |
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14 |
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15 public class LuaParser extends BaseParser<Object> { |
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16 |
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17 Rule Target() { |
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18 return Sequence(Spaces(), Expr(), EOI); |
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19 } |
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20 |
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21 Rule Expr() { |
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22 return OrExpr(); |
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23 } |
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24 |
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25 Rule OrExpr() { |
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26 return Sequence( |
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27 AndExpr(), |
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28 ZeroOrMore( "or", Spaces(), AndExpr(), push( new OrExpr((Expr)pop(1),(Expr)pop()) ) ) |
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29 ); |
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30 } |
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31 |
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32 Rule AndExpr() { |
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33 return Sequence( |
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34 RelExpr(), |
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35 ZeroOrMore( "and", Spaces(), RelExpr(), push( new AndExpr((Expr)pop(1),(Expr)pop()) ) ) |
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36 ); |
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37 } |
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38 |
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39 Rule RelExpr() { |
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40 return Sequence( |
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41 ConcatExpr(), |
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42 ZeroOrMore( |
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43 FirstOf( |
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44 Sequence( "==", Spaces(), ConcatExpr(), push( new EqExpr((Expr)pop(1),(Expr)pop()) ) ), |
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45 Sequence( "~=", Spaces(), ConcatExpr(), push( new NotExpr(new EqExpr((Expr)pop(1),(Expr)pop())) ) ), |
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46 Sequence( "<=", Spaces(), ConcatExpr(), push( new LeExpr((Expr)pop(1),(Expr)pop()) ) ), |
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47 Sequence( ">=", Spaces(), ConcatExpr(), push( new LeExpr((Expr)pop(),(Expr)pop()) ) ), |
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48 Sequence( "<", Spaces(), ConcatExpr(), push( new LtExpr((Expr)pop(1),(Expr)pop()) ) ), |
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49 Sequence( ">", Spaces(), ConcatExpr(), push( new LtExpr((Expr)pop(),(Expr)pop()) ) ) |
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50 ) |
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51 ) |
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52 ); |
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53 } |
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54 |
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55 Rule ConcatExpr() { |
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56 return Sequence( |
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57 SumExpr(), |
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58 Optional( "..", Spaces(), ConcatExpr(), push( new ConcatExpr((Expr)pop(1),(Expr)pop()) ) ) |
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59 ); |
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60 } |
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61 |
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62 Rule SumExpr() { |
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63 return Sequence( |
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64 TermExpr(), |
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65 ZeroOrMore( |
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66 FirstOf( |
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67 Sequence( '+', Spaces(), TermExpr(), push( new AddExpr((Expr)pop(1),(Expr)pop()) ) ), |
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68 Sequence( '-', Spaces(), TermExpr(), push( new SubExpr((Expr)pop(1),(Expr)pop()) ) ) |
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69 ) |
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70 ) |
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71 ); |
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72 } |
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73 |
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74 Rule TermExpr() { |
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75 return Sequence( |
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76 UnaryExpr(), |
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77 ZeroOrMore( |
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78 FirstOf( |
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79 Sequence( '*', Spaces(), UnaryExpr(), push( new MulExpr((Expr)pop(1),(Expr)pop()) ) ), |
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80 Sequence( '/', Spaces(), UnaryExpr(), push( new DivExpr((Expr)pop(1),(Expr)pop()) ) ), |
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81 Sequence( '%', Spaces(), UnaryExpr(), push( new ModExpr((Expr)pop(1),(Expr)pop()) ) ) |
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82 ) |
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83 ) |
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84 ); |
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85 } |
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86 |
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87 Rule UnaryExpr() { |
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88 return FirstOf( |
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89 Sequence( '#', Spaces(), PowExpr(), push( new LenExpr((Expr)pop()) ) ), |
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90 Sequence( '-', Spaces(), PowExpr(), push( new UnmExpr((Expr)pop()) ) ), |
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91 Sequence( "not", Spaces(), PowExpr(), push( new NotExpr((Expr)pop()) ) ), |
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92 PowExpr() |
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93 ); |
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94 } |
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95 |
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96 Rule PowExpr() { |
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97 return Sequence( |
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98 SingleExpr(), |
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99 Optional( '^', Spaces(), PowExpr(), push( new PowExpr((Expr)pop(1),(Expr)pop()) ) ) |
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100 ); |
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101 } |
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102 |
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103 Rule SingleExpr() { |
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104 return FirstOf( |
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105 Sequence( '(', Spaces(), Expr(), ')', Spaces() ), |
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106 LiteralExpr() |
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107 ); |
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108 } |
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109 |
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110 Rule LiteralExpr() { |
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111 return Sequence( |
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112 Literal(), Spaces(), |
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113 push(new ConstExpr(pop())) |
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114 ); |
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115 } |
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116 |
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117 Rule Literal() { |
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118 return FirstOf( |
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119 NilLiteral(), |
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120 BooleanLiteral(), |
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121 NumberLiteral(), |
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122 StringLiteral() |
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123 ); |
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124 } |
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125 |
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126 Rule NilLiteral() { |
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127 return Sequence( "nil", push(null) ); |
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128 } |
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129 |
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130 Rule BooleanLiteral() { |
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131 return FirstOf( |
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132 Sequence( "true", push(true) ), |
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133 Sequence( "false", push(false) ) |
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134 ); |
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135 } |
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136 |
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137 Rule NumberLiteral() { |
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138 return Sequence( |
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139 Number(), |
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140 push(new LuaNumber((Double)pop())) |
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141 ); |
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142 } |
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143 |
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144 Rule Number() { |
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145 return FirstOf( |
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146 Sequence( |
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147 IgnoreCase("0x"), |
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148 OneOrMore(HexDigit()), |
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149 push((double)Long.parseLong(match(),16)) |
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150 ), |
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151 Sequence( |
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152 DecNumber(), |
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153 push(Double.parseDouble(match())) |
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154 ) |
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155 ); |
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156 } |
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157 |
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158 Rule DecNumber() { |
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159 return FirstOf( |
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160 Sequence( |
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161 Int(), |
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162 Optional( '.', Optional(Int()) ), |
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163 NumberExp() |
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164 ), |
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165 Sequence( '.', Int(), NumberExp() ) |
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166 ); |
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167 } |
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168 |
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169 Rule NumberExp() { |
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170 return Optional( |
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171 IgnoreCase('e'), |
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172 Optional(AnyOf("+-")), |
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173 Int() |
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174 ); |
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175 } |
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176 |
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177 Rule Int() { |
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178 return OneOrMore(Digit()); |
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179 } |
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180 |
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181 Rule HexDigit() { |
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182 return FirstOf( |
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183 Digit(), |
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184 AnyOf("abcdefABCDEF") |
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185 ); |
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186 } |
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187 |
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188 Rule Digit() { |
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189 return CharRange('0', '9'); |
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190 } |
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191 |
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192 Rule StringLiteral() { |
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193 return FirstOf( |
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194 QuotedString('"'), |
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195 QuotedString('\'') |
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196 ); |
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197 } |
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198 |
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199 Rule QuotedString(char quote) { |
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200 return Sequence( |
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201 quote, |
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202 push(new StringBuffer()), |
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203 ZeroOrMore( |
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204 FirstOf( |
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205 Sequence( |
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206 NoneOf("\\\n"+quote), |
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207 append(matchedChar()) |
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208 ), |
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209 EscSeq() |
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210 ) |
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211 ), |
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212 quote, |
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213 push(((StringBuffer)pop()).toString()) |
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214 ); |
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215 } |
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216 |
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217 Rule EscSeq() { |
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218 return Sequence( |
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219 '\\', |
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220 FirstOf( |
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221 Sequence( 'a', append('\u0007') ), |
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222 Sequence( 'b', append('\b') ), |
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223 Sequence( 'f', append('\f') ), |
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224 Sequence( 'n', append('\n') ), |
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225 Sequence( 'r', append('\r') ), |
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226 Sequence( 't', append('\t') ), |
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227 Sequence( 'v', append('\u000b') ), |
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228 Sequence( '\\', append('\\') ), |
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229 Sequence( '"', append('"') ), |
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230 Sequence( '\'', append('\'') ), |
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231 Sequence( |
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232 'x', |
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233 Sequence( HexDigit(), HexDigit() ), |
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234 append( (char)Integer.parseInt(match(),16) ) |
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235 ), |
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236 Sequence( |
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237 Sequence( |
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238 Digit(), |
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239 Optional( |
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240 Digit(), |
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241 Optional( |
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242 Digit() |
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243 ) |
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244 ) |
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245 ), |
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246 append( (char)Integer.parseInt(match()) ) |
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247 ) |
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248 ) |
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249 ); |
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250 } |
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251 |
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252 boolean append(char ch) { |
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253 StringBuffer sb = (StringBuffer)peek(); |
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254 sb.append(ch); |
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255 return true; |
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256 } |
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257 |
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258 public Rule Spaces() { |
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259 return ZeroOrMore(AnyOf(" \t")); |
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260 } |
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261 |
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262 // for testing |
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263 public static void main(String[] args) throws Exception { |
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264 LuaParser parser = Parboiled.createParser(LuaParser.class); |
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265 while( true ) { |
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266 String input = new Scanner(System.in).nextLine(); |
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267 ParsingResult<?> result = new ReportingParseRunner(parser.Target()).run(input); |
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268 if( result.hasErrors() ) { |
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269 System.out.println("Parse Errors:\n" + ErrorUtils.printParseErrors(result)); |
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270 } else { |
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271 Expr expr = (Expr)result.resultValue; |
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272 LuaState lua = new LuaState(); |
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273 Object val = expr.eval(lua); |
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274 System.out.println("Result: "+Lua.toString(val)); |
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275 } |
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276 } |
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277 } |
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278 } |