Mercurial > projects > dang
annotate parser/Parser.d @ 28:69464d465284 new_gen
Now supporting structs - both read and write. Still a few errors though, so watch out.
| author | Anders Johnsen <skabet@gmail.com> |
|---|---|
| date | Sun, 20 Apr 2008 11:20:28 +0200 |
| parents | e331e4e816e4 |
| children | 41d23f2762c3 |
| rev | line source |
|---|---|
| 1 | 1 module parser.Parser; |
| 2 | |
| 3 import lexer.Lexer, | |
| 4 lexer.Token; | |
| 5 | |
| 6 import ast.Exp, | |
| 7 ast.Stmt, | |
| 8 ast.Decl; | |
| 9 | |
|
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10 import misc.Error; |
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11 |
| 1 | 12 import tango.io.Stdout, |
| 13 Integer = tango.text.convert.Integer; | |
| 14 | |
| 15 class Parser | |
| 16 { | |
| 17 | |
| 18 public: | |
| 19 Decl[] parse(Lexer lexer) | |
| 20 { | |
| 21 this.lexer = lexer; | |
| 22 | |
| 23 | |
| 24 Decl[] declarations; | |
| 25 | |
| 26 while(lexer.peek.type != Tok.EOF) | |
| 27 { | |
|
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28 declarations ~= parseRootDecl; |
| 1 | 29 } |
| 30 | |
| 31 return declarations; | |
| 32 } | |
| 33 | |
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34 Decl parseRootDecl() |
| 1 | 35 { |
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36 Token t = lexer.peek; |
| 1 | 37 |
| 38 switch(t.type) | |
| 39 { | |
| 40 case Tok.Byte, Tok.Ubyte, | |
| 41 Tok.Short, Tok.Ushort, | |
| 42 Tok.Int, Tok.Uint, | |
| 43 Tok.Long, Tok.Ulong, | |
| 44 Tok.Float, Tok.Double, | |
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45 Tok.Bool, |
| 1 | 46 Tok.Identifier: |
| 47 Identifier type = new Identifier(t); | |
| 48 | |
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49 Token iden = lexer.peek(1); |
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50 |
| 1 | 51 switch(iden.type) |
| 52 { | |
| 53 case Tok.Identifier: | |
| 54 Identifier identifier = new Identifier(iden); | |
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55 Token p = lexer.peek(2); |
| 1 | 56 switch(p.type) |
| 57 { | |
| 58 case Tok.OpenParentheses: | |
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59 lexer.next; lexer.next; |
| 1 | 60 return parseFunc(type, identifier); |
| 61 case Tok.Seperator: | |
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62 lexer.next; lexer.next; |
| 1 | 63 require(Tok.Seperator); |
| 64 return new VarDecl(type, identifier, null); | |
| 65 case Tok.Assign: | |
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66 lexer.next; lexer.next; |
| 1 | 67 lexer.next(); |
| 68 auto exp = parseExpression(); | |
| 69 require(Tok.Seperator); | |
| 70 return new VarDecl(type, identifier, exp); | |
| 71 default: | |
| 72 char[] c = t.getType; | |
| 73 error("Unexpexted token "~c~" at line "~Integer.toString(__LINE__)); | |
| 74 } | |
| 75 break; | |
| 76 default: | |
| 77 char[] c = t.getType; | |
| 78 error("Unexpexted token "~c~" at line "~Integer.toString(__LINE__)); | |
| 79 } | |
| 80 break; | |
| 22 | 81 case Tok.Struct: |
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82 lexer.next; |
| 22 | 83 Token iden = lexer.next; |
| 84 switch(iden.type) | |
| 85 { | |
| 86 case Tok.Identifier: | |
| 87 Identifier identifier = new Identifier(iden); | |
| 88 return new StructDecl (identifier, parseStruct()); | |
| 89 default: | |
| 90 throw new Error("Expected struct identifier, but got "~iden.getType, | |
| 91 iden.location); | |
| 92 } | |
| 1 | 93 case Tok.EOF: |
| 94 return null; | |
| 95 default: | |
| 96 char[] c = t.getType; | |
| 97 error("Unexpexted token "~c~" at line "~Integer.toString(__LINE__)); | |
| 98 } | |
| 99 } | |
| 100 | |
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101 Decl parseDecl() |
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102 { |
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103 Token t = lexer.peek; |
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104 |
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105 switch(t.type) |
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106 { |
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107 case Tok.Byte, Tok.Ubyte, |
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108 Tok.Short, Tok.Ushort, |
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109 Tok.Int, Tok.Uint, |
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110 Tok.Long, Tok.Ulong, |
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111 Tok.Float, Tok.Double, |
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112 Tok.Bool, |
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113 Tok.Identifier: |
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114 Identifier type = new Identifier(t); |
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115 |
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116 Token iden = lexer.peek(1); |
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117 |
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118 switch(iden.type) |
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119 { |
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120 case Tok.Identifier: |
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121 Identifier identifier = new Identifier(iden); |
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122 Token p = lexer.peek(2); |
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123 switch(p.type) |
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124 { |
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125 case Tok.OpenParentheses: |
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126 lexer.next; lexer.next; |
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127 return parseFunc(type, identifier); |
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128 case Tok.Seperator: |
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129 lexer.next; lexer.next; |
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130 require(Tok.Seperator); |
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131 return new VarDecl(type, identifier, null); |
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132 case Tok.Assign: |
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133 lexer.next; lexer.next; |
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134 lexer.next(); |
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135 auto exp = parseExpression(); |
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136 require(Tok.Seperator); |
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137 return new VarDecl(type, identifier, exp); |
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138 default: |
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139 char[] c = t.getType; |
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140 error("Unexpexted token "~c~" at line "~Integer.toString(__LINE__)); |
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141 } |
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142 break; |
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143 default: |
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144 char[] c = t.getType; |
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145 error("Unexpexted token "~c~" at line "~Integer.toString(__LINE__)); |
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146 } |
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147 break; |
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148 case Tok.EOF: |
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149 return null; |
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150 default: |
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151 char[] c = t.getType; |
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152 error("Unexpexted token "~c~" at line "~Integer.toString(__LINE__)); |
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153 } |
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154 } |
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155 |
| 22 | 156 VarDecl[] parseStruct() |
| 157 { | |
| 158 VarDecl[] varDecls; | |
| 159 require(Tok.OpenBrace); | |
| 160 while(lexer.peek.type != Tok.CloseBrace) | |
| 161 { | |
| 162 varDecls ~= cast(VarDecl)parseDecl; | |
| 163 } | |
| 164 | |
| 165 require(Tok.CloseBrace); | |
| 166 return varDecls; | |
| 167 } | |
| 168 | |
| 1 | 169 Stmt parseStatement() |
| 170 { | |
| 171 Token t = lexer.peek; | |
| 172 | |
| 173 switch(t.type) | |
| 174 { | |
| 175 case Tok.Return: | |
| 176 lexer.next; | |
| 177 auto ret = new ReturnStmt(); | |
| 178 ret.exp = parseExpression(); | |
| 179 require(Tok.Seperator); | |
| 180 return ret; | |
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181 |
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182 case Tok.If: |
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183 lexer.next; |
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184 require(Tok.OpenParentheses); |
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185 auto condition = parseExpression(); |
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186 require(Tok.CloseParentheses); |
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187 |
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188 auto then_body = parseBlockOrSingleStmt(); |
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189 |
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190 Stmt[] else_body; |
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191 if (lexer.peek.type == Tok.Else) |
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192 { |
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193 lexer.next; |
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194 else_body = parseBlockOrSingleStmt(); |
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195 } |
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196 |
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197 return new IfStmt(condition, then_body, else_body); |
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198 |
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199 case Tok.While: |
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200 lexer.next; |
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201 require(Tok.OpenParentheses); |
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202 auto condition = parseExpression(); |
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203 require(Tok.CloseParentheses); |
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204 return new WhileStmt(condition, parseBlockOrSingleStmt()); |
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205 |
| 1 | 206 case Tok.Identifier: |
| 207 Token n = lexer.peek(1); | |
| 208 switch(n.type) | |
| 209 { | |
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210 case Tok.Dot: |
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211 Exp iden = parseExpIdentifier(new Identifier(lexer.next)); |
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212 switch(lexer.peek.type) |
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213 { |
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214 case Tok.Assign: |
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215 lexer.next; |
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216 auto stmt = new ExpStmt(new AssignExp(iden , parseExpression())); |
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217 require(Tok.Seperator); |
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218 return stmt; |
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219 break; |
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220 } |
| 1 | 221 case Tok.Assign: |
| 222 lexer.next; | |
| 223 lexer.next; | |
| 224 auto stmt = new ExpStmt(new AssignExp(new Identifier(t), parseExpression())); | |
| 225 require(Tok.Seperator); | |
| 226 return stmt; | |
| 227 break; | |
| 22 | 228 case Tok.Identifier: |
| 229 auto decl = new DeclStmt(parseDecl()); | |
| 230 return decl; | |
| 1 | 231 |
| 232 default: | |
| 233 auto e = new ExpStmt(parseExpression()); | |
| 234 require(Tok.Seperator); | |
| 235 return e; | |
| 236 | |
| 237 } | |
| 238 break; | |
| 239 | |
| 240 default: | |
| 241 auto decl = new DeclStmt(parseDecl()); | |
| 242 //require(Tok.Seperator); | |
| 243 return decl; | |
| 244 } | |
| 245 return new Stmt(); | |
| 246 } | |
| 247 | |
| 248 FuncDecl parseFunc(Identifier type, Identifier identifier) | |
| 249 { | |
| 250 VarDecl[] funcArgs = parseFuncArgs(); | |
| 251 | |
| 252 lexer.next; // Remove the "{" | |
| 253 | |
| 254 Stmt[] statements; | |
| 255 | |
| 256 while(lexer.peek.type != Tok.CloseBrace) | |
| 257 statements ~= parseStatement(); | |
| 258 | |
| 259 lexer.next; // Remove "}" | |
| 260 | |
| 261 return new FuncDecl(type, identifier, funcArgs, statements); | |
| 262 } | |
| 263 | |
| 264 VarDecl[] parseFuncArgs() | |
| 265 { | |
| 266 lexer.next; // Remove the "(" token. | |
| 267 | |
| 268 VarDecl[] funcArgs; | |
| 269 | |
| 270 while(lexer.peek.type != Tok.CloseParentheses) | |
| 271 { | |
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272 auto t = parseType; |
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273 auto i = parseIdentifier; |
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274 funcArgs ~= new VarDecl(t, i); |
| 1 | 275 |
| 276 if(lexer.peek.type == Tok.Comma) | |
| 277 lexer.next; | |
| 278 } | |
| 279 | |
| 280 lexer.next; // Remove the ")" | |
| 281 | |
| 282 return funcArgs; | |
| 283 } | |
| 284 | |
| 285 Identifier parseIdentifier() | |
| 286 { | |
| 287 Token identifier = lexer.next; | |
| 288 | |
| 289 switch(identifier.type) | |
| 290 { | |
| 291 case Tok.Identifier: | |
| 292 return new Identifier(identifier); | |
| 293 break; | |
| 294 default: | |
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295 throw new Error("Unexpexted token in Identifier parsing. Got "~identifier.getType, identifier.location); |
| 1 | 296 } |
| 297 } | |
| 298 | |
| 299 Identifier parseType() | |
| 300 { | |
| 301 Token type = lexer.next; | |
| 302 | |
| 303 switch(type.type) | |
| 304 { | |
| 305 case Tok.Byte, Tok.Ubyte, | |
| 306 Tok.Short, Tok.Ushort, | |
| 307 Tok.Int, Tok.Uint, | |
| 308 Tok.Long, Tok.Ulong, | |
| 309 Tok.Float, Tok.Double, | |
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310 Tok.Bool, |
| 1 | 311 Tok.Identifier: |
| 312 return new Identifier(type); | |
| 313 break; | |
| 314 default: | |
| 315 char[] c = type.getType; | |
| 316 error("Unexpexted token in Type parsing. Got "~c); | |
| 317 } | |
| 318 } | |
| 319 | |
| 320 // -- Expression parsing -- // | |
| 321 private: | |
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322 Exp parseExpIdentifier(Exp target) |
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323 { |
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324 switch(lexer.peek.type) |
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325 { |
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326 case Tok.Dot: |
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327 switch(lexer.peek(1).type) |
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328 { |
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329 case Tok.Identifier: |
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330 lexer.next; |
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331 return parseExpIdentifier( |
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332 new MemberLookup(target, new Identifier(lexer.next))); |
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333 default: |
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334 throw new Error("Expected identifier after '.'", lexer.peek(1).location); |
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335 } |
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336 default: |
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337 return target; |
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338 } |
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339 } |
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340 |
| 1 | 341 Exp parseExpression(int p = 0) |
| 342 { | |
| 343 auto exp = P(); | |
| 344 Token next = lexer.peek(); | |
| 345 BinOp* op = null; | |
| 346 while ((op = binary(next.type)) != null && op.prec >= p) | |
| 347 { | |
| 348 lexer.next(); | |
| 349 int q = op.leftAssoc? 1 + op.prec : op.prec; | |
| 350 auto exp2 = parseExpression(q); | |
| 351 exp = new BinaryExp(op.operator, exp, exp2); | |
| 352 next = lexer.peek(); | |
| 353 } | |
| 354 | |
| 355 return exp; | |
| 356 } | |
| 357 | |
| 358 Exp P() | |
| 359 { | |
| 360 Token next = lexer.next(); | |
| 361 if (auto op = unary(next.type)) | |
| 362 return new NegateExp(parseExpression(op.prec)); | |
| 363 else if (next.type == Tok.OpenParentheses) | |
| 364 { | |
| 365 auto e = parseExpression(0); | |
| 366 require(Tok.CloseParentheses); | |
| 367 return e; | |
| 368 } | |
| 369 else if (next.type == Tok.Identifier) | |
| 370 { | |
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371 Exp iden = parseExpIdentifier(new Identifier(next)); |
| 1 | 372 switch(lexer.peek.type) |
| 373 { | |
| 374 case Tok.OpenParentheses: | |
| 375 lexer.next; | |
| 376 Exp[] args; | |
| 377 while(lexer.peek.type != Tok.CloseParentheses) | |
| 378 { | |
| 379 if(lexer.peek.type == Tok.Comma) | |
| 380 { | |
| 381 lexer.next; | |
| 382 } | |
| 383 args ~= parseExpression(); | |
| 384 } | |
| 385 | |
| 386 lexer.next(); | |
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387 return new CallExp(iden, args); |
| 1 | 388 |
| 389 default: | |
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390 return iden; |
| 1 | 391 } |
| 392 } | |
| 393 else if (next.type == Tok.Integer) | |
| 394 return new IntegerLit(next); | |
| 395 | |
| 396 Stdout.formatln("{}", next.getType); | |
| 397 assert(0, "Should not happen"); | |
| 398 } | |
| 399 | |
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400 private Stmt[] parseBlockOrSingleStmt() |
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401 { |
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402 Stmt[] stmts; |
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403 if (lexer.peek.type == Tok.OpenBrace) |
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404 { |
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405 lexer.next; |
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406 while(lexer.peek.type != Tok.CloseBrace) |
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407 stmts ~= parseStatement(); |
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408 lexer.next; |
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409 } |
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410 else |
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411 stmts ~= parseStatement(); |
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412 |
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413 return stmts; |
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414 } |
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415 |
| 1 | 416 struct UnOp |
| 417 { | |
| 418 Tok tokenType; | |
| 419 int prec; | |
| 420 } | |
| 421 | |
| 422 static UnOp[] _unary = [{Tok.Sub, 4}]; | |
| 423 UnOp* unary(Tok t) | |
| 424 { | |
| 425 foreach (ref op; _unary) | |
| 426 if (op.tokenType == t) | |
| 427 return &op; | |
| 428 return null; | |
| 429 } | |
| 430 | |
| 431 struct BinOp | |
| 432 { | |
| 433 Tok tokenType; | |
| 434 int prec; | |
| 435 bool leftAssoc; | |
| 436 BinaryExp.Operator operator; | |
| 437 } | |
| 438 | |
| 439 static BinOp[] _binary = | |
| 440 [ | |
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441 {Tok.Eq, 2, true, BinaryExp.Operator.Eq}, |
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442 {Tok.Ne, 2, true, BinaryExp.Operator.Ne}, |
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443 {Tok.Lt, 2, true, BinaryExp.Operator.Lt}, |
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444 {Tok.Le, 2, true, BinaryExp.Operator.Le}, |
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445 {Tok.Gt, 2, true, BinaryExp.Operator.Gt}, |
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446 {Tok.Ge, 2, true, BinaryExp.Operator.Ge}, |
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447 |
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448 {Tok.Add, 3, true, BinaryExp.Operator.Add}, |
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449 {Tok.Sub, 3, true, BinaryExp.Operator.Sub}, |
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450 |
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451 {Tok.Mul, 5, true, BinaryExp.Operator.Mul}, |
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452 {Tok.Div, 5, true, BinaryExp.Operator.Div} |
| 1 | 453 ]; |
| 454 BinOp* binary(Tok t) | |
| 455 { | |
| 456 foreach (ref op; _binary) | |
| 457 if (op.tokenType == t) | |
| 458 return &op; | |
| 459 return null; | |
| 460 } | |
| 461 | |
| 462 private: | |
| 463 | |
| 464 void require(Tok t) | |
| 465 { | |
| 466 if (lexer.peek().type != t) | |
| 467 error("Unexpexted token: Got '"~lexer.peek.getType~"' Expected '"~typeToString[t]~"'"); | |
| 468 lexer.next(); | |
| 469 } | |
| 470 | |
| 471 void error(char[] errMsg) | |
| 472 { | |
| 473 throw new Exception("Parser error: " ~errMsg); | |
| 474 } | |
| 475 | |
| 476 Lexer lexer; | |
| 477 } |