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annotate src/luan/interp/LuaParser.java @ 7:bca8fc5d928b

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work on expressions git-svn-id: https://luan-java.googlecode.com/svn/trunk@8 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 20 Nov 2012 10:06:27 +0000
parents a315783c9524
children 8896068e0a4b
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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 SumExpr(),
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42 ZeroOrMore(
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43 FirstOf(
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44 Sequence( "==", Spaces(), SumExpr(), push( new EqExpr((Expr)pop(1),(Expr)pop()) ) ),
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45 Sequence( "~=", Spaces(), SumExpr(), push( new NotExpr(new EqExpr((Expr)pop(1),(Expr)pop())) ) )
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46 )
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47 )
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48 );
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49 }
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50
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51 Rule SumExpr() {
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52 return Sequence(
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53 TermExpr(),
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54 ZeroOrMore(
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55 FirstOf(
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56 Sequence( '+', Spaces(), TermExpr(), push( new AddExpr((Expr)pop(1),(Expr)pop()) ) ),
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57 Sequence( '-', Spaces(), TermExpr(), push( new SubExpr((Expr)pop(1),(Expr)pop()) ) )
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58 )
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59 )
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60 );
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61 }
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62
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63 Rule TermExpr() {
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64 return Sequence(
7
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65 UnaryExpr(),
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66 ZeroOrMore(
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67 FirstOf(
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68 Sequence( '*', Spaces(), UnaryExpr(), push( new MulExpr((Expr)pop(1),(Expr)pop()) ) ),
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69 Sequence( '/', Spaces(), UnaryExpr(), push( new DivExpr((Expr)pop(1),(Expr)pop()) ) ),
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70 Sequence( '%', Spaces(), UnaryExpr(), push( new ModExpr((Expr)pop(1),(Expr)pop()) ) )
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71 )
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72 )
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73 );
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74 }
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75
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76 Rule UnaryExpr() {
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77 return FirstOf(
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78 Sequence( '#', Spaces(), SingleExpr(), push( new LenExpr((Expr)pop()) ) ),
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79 Sequence( '-', Spaces(), SingleExpr(), push( new UnmExpr((Expr)pop()) ) ),
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80 Sequence( "not", Spaces(), SingleExpr(), push( new NotExpr((Expr)pop()) ) ),
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81 SingleExpr()
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82 );
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83 }
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84
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85 Rule SingleExpr() {
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86 return FirstOf(
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87 Sequence( '(', Spaces(), Expr(), ')', Spaces() ),
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88 LiteralExpr()
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89 );
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90 }
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91
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92 Rule LiteralExpr() {
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93 return Sequence(
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94 Literal(), Spaces(),
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95 push(new ConstExpr(pop()))
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96 );
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97 }
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98
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99 Rule Literal() {
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100 return FirstOf(
7
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101 NilLiteral(),
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102 BooleanLiteral(),
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103 NumberLiteral(),
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104 StringLiteral()
5
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105 );
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106 }
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107
7
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108 Rule NilLiteral() {
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109 return Sequence( "nil", push(null) );
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110 }
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111
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112 Rule BooleanLiteral() {
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113 return FirstOf(
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114 Sequence( "true", push(true) ),
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115 Sequence( "false", push(false) )
5
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116 );
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117 }
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118
7
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119 Rule NumberLiteral() {
5
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120 return Sequence(
6
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121 Number(),
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122 push(new LuaNumber((Double)pop()))
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123 );
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124 }
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125
6
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126 Rule Number() {
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127 return FirstOf(
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128 Sequence(
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129 IgnoreCase("0x"),
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130 OneOrMore(HexDigit()),
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131 push((double)Long.parseLong(match(),16))
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132 ),
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133 Sequence(
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134 DecNumber(),
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135 push(Double.parseDouble(match()))
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136 )
5
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137 );
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138 }
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139
6
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140 Rule DecNumber() {
5
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141 return FirstOf(
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142 Sequence(
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143 Int(),
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144 Optional( '.', Optional(Int()) ),
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145 NumberExp()
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146 ),
7
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147 Sequence( '.', Int(), NumberExp() )
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148 );
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149 }
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150
6
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151 Rule NumberExp() {
5
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152 return Optional(
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153 IgnoreCase('e'),
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154 Optional(AnyOf("+-")),
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155 Int()
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156 );
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157 }
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158
6
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159 Rule Int() {
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160 return OneOrMore(Digit());
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161 }
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162
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163 Rule HexDigit() {
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164 return FirstOf(
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165 Digit(),
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166 AnyOf("abcdefABCDEF")
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167 );
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168 }
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169
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170 Rule Digit() {
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171 return CharRange('0', '9');
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172 }
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173
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174 Rule StringLiteral() {
6
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175 return FirstOf(
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176 QuotedString('"'),
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177 QuotedString('\'')
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178 );
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179 }
5
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180
6
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181 Rule QuotedString(char quote) {
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182 return Sequence(
7
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183 quote,
6
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184 push(new StringBuffer()),
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185 ZeroOrMore(
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186 FirstOf(
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187 Sequence(
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188 NoneOf("\\\n"+quote),
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189 append(matchedChar())
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190 ),
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191 EscSeq()
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192 )
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193 ),
7
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194 quote,
6
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195 push(((StringBuffer)pop()).toString())
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196 );
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197 }
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198
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199 Rule EscSeq() {
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200 return Sequence(
7
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201 '\\',
6
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202 FirstOf(
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diff changeset
203 Sequence( 'a', append('\u0007') ),
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204 Sequence( 'b', append('\b') ),
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diff changeset
205 Sequence( 'f', append('\f') ),
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diff changeset
206 Sequence( 'n', append('\n') ),
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diff changeset
207 Sequence( 'r', append('\r') ),
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diff changeset
208 Sequence( 't', append('\t') ),
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diff changeset
209 Sequence( 'v', append('\u000b') ),
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diff changeset
210 Sequence( '\\', append('\\') ),
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diff changeset
211 Sequence( '"', append('"') ),
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diff changeset
212 Sequence( '\'', append('\'') ),
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213 Sequence(
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diff changeset
214 'x',
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215 Sequence( HexDigit(), HexDigit() ),
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216 append( (char)Integer.parseInt(match(),16) )
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217 ),
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218 Sequence(
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219 Sequence(
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220 Digit(),
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221 Optional(
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222 Digit(),
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223 Optional(
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224 Digit()
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225 )
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226 )
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227 ),
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228 append( (char)Integer.parseInt(match()) )
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229 )
6
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230 )
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231 );
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232 }
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233
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234 boolean append(char ch) {
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235 StringBuffer sb = (StringBuffer)peek();
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236 sb.append(ch);
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237 return true;
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238 }
5
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239
7
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240 public Rule Spaces() {
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241 return ZeroOrMore(AnyOf(" \t"));
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242 }
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243
5
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244 // for testing
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245 public static void main(String[] args) throws Exception {
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246 LuaParser parser = Parboiled.createParser(LuaParser.class);
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247 while( true ) {
6
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248 String input = new Scanner(System.in).nextLine();
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249 ParsingResult<?> result = new ReportingParseRunner(parser.Target()).run(input);
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250 if( result.hasErrors() ) {
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251 System.out.println("Parse Errors:\n" + ErrorUtils.printParseErrors(result));
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252 } else {
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253 Expr expr = (Expr)result.resultValue;
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254 LuaState lua = new LuaState();
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255 Object val = expr.eval(lua);
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256 System.out.println("Result: "+Lua.toString(val));
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257 }
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258 }
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259 }
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260 }