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annotate src/luan/interp/LuaParser.java @ 8:8896068e0a4b

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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>
date Wed, 21 Nov 2012 06:57:09 +0000
parents bca8fc5d928b
children 600676034a1a
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1 package luan.interp;
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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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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
8
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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(
7
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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(
8
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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()) ) )
7
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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(),
5
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113 push(new ConstExpr(pop()))
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114 );
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115 }
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116
7
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117 Rule Literal() {
5
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118 return FirstOf(
7
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119 NilLiteral(),
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120 BooleanLiteral(),
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121 NumberLiteral(),
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122 StringLiteral()
5
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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) )
5
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134 );
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135 }
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136
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137 Rule NumberLiteral() {
5
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138 return Sequence(
6
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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
6
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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 )
5
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155 );
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156 }
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157
6
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158 Rule DecNumber() {
5
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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 ),
7
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165 Sequence( '.', Int(), NumberExp() )
5
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166 );
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167 }
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168
6
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169 Rule NumberExp() {
5
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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
6
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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() {
6
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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 }
5
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198
6
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199 Rule QuotedString(char quote) {
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200 return Sequence(
7
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201 quote,
6
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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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diff changeset
207 append(matchedChar())
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208 ),
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209 EscSeq()
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210 )
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diff changeset
211 ),
7
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diff changeset
212 quote,
6
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diff changeset
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(
7
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219 '\\',
6
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220 FirstOf(
7
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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 )
6
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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 }
5
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257
7
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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
5
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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 ) {
6
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266 String input = new Scanner(System.in).nextLine();
5
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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 }