Mercurial > projects > dang
annotate parser/Parser.d @ 37:858b9805843d new_gen
Bug-fixes
Void can now be used and is recognized as a keyword by lexer
Fixed a problem with casting on pointer types
The expression is now optional for a ReturnStmt (only legal in void funcs)
| author | Anders Halager <halager@gmail.com> |
|---|---|
| date | Sun, 20 Apr 2008 23:53:05 +0200 |
| parents | ce17bea8e9bd |
| children | 495188f9078e |
| 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, |
| 37 | 46 Tok.Void, |
| 1 | 47 Tok.Identifier: |
| 48 Identifier type = new Identifier(t); | |
| 49 | |
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50 Token iden = lexer.peek(1); |
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51 |
| 1 | 52 switch(iden.type) |
| 53 { | |
| 54 case Tok.Identifier: | |
| 55 Identifier identifier = new Identifier(iden); | |
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56 Token p = lexer.peek(2); |
| 1 | 57 switch(p.type) |
| 58 { | |
| 59 case Tok.OpenParentheses: | |
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60 lexer.next; lexer.next; |
| 1 | 61 return parseFunc(type, identifier); |
| 62 case Tok.Seperator: | |
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63 lexer.next; lexer.next; |
| 1 | 64 require(Tok.Seperator); |
| 65 return new VarDecl(type, identifier, null); | |
| 66 case Tok.Assign: | |
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67 lexer.next; lexer.next; |
| 1 | 68 lexer.next(); |
| 69 auto exp = parseExpression(); | |
| 70 require(Tok.Seperator); | |
| 71 return new VarDecl(type, identifier, exp); | |
| 72 default: | |
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73 char[] c = p.getType; |
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74 throw error(__LINE__, UnexpectedTokMulti) |
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75 .tok(p) |
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76 .arg(c) |
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77 .arg(Tok.OpenParentheses, Tok.Seperator, Tok.Assign); |
| 1 | 78 } |
| 79 break; | |
| 80 default: | |
| 81 char[] c = t.getType; | |
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82 throw error(__LINE__, UnexpectedTok).tok(iden).arg(c); |
| 1 | 83 } |
| 84 break; | |
| 22 | 85 case Tok.Struct: |
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86 lexer.next; |
| 22 | 87 Token iden = lexer.next; |
| 88 switch(iden.type) | |
| 89 { | |
| 90 case Tok.Identifier: | |
| 91 Identifier identifier = new Identifier(iden); | |
| 92 return new StructDecl (identifier, parseStruct()); | |
| 93 default: | |
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94 throw error(__LINE__, "Expected struct identifier, but got %0").arg(iden.getType); |
| 22 | 95 } |
| 1 | 96 case Tok.EOF: |
| 97 return null; | |
| 98 default: | |
| 99 char[] c = t.getType; | |
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100 throw error(__LINE__, UnexpectedTok).tok(t).arg(c); |
| 1 | 101 } |
| 102 } | |
| 103 | |
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104 Decl parseDecl() |
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105 { |
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106 Token t = lexer.peek; |
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107 |
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108 switch(t.type) |
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109 { |
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110 case Tok.Byte, Tok.Ubyte, |
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111 Tok.Short, Tok.Ushort, |
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112 Tok.Int, Tok.Uint, |
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113 Tok.Long, Tok.Ulong, |
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114 Tok.Float, Tok.Double, |
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115 Tok.Bool, |
| 37 | 116 Tok.Void, |
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117 Tok.Identifier: |
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118 Identifier type = new Identifier(t); |
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119 |
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120 Token iden = lexer.peek(1); |
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121 |
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122 switch(iden.type) |
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123 { |
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124 case Tok.Identifier: |
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125 Identifier identifier = new Identifier(iden); |
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126 Token p = lexer.peek(2); |
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127 switch(p.type) |
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128 { |
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129 case Tok.OpenParentheses: |
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130 lexer.next; lexer.next; |
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131 return parseFunc(type, identifier); |
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132 case Tok.Seperator: |
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133 lexer.next; lexer.next; |
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134 require(Tok.Seperator); |
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135 return new VarDecl(type, identifier, null); |
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136 case Tok.Assign: |
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137 lexer.next; lexer.next; |
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138 lexer.next(); |
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139 auto exp = parseExpression(); |
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140 require(Tok.Seperator); |
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141 return new VarDecl(type, identifier, exp); |
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142 default: |
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143 char[] c = p.getType; |
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144 throw error(__LINE__, UnexpectedTokMulti) |
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145 .tok(p) |
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146 .arg(c) |
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147 .arg(Tok.OpenParentheses, Tok.Seperator, Tok.Assign); |
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148 } |
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149 break; |
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150 default: |
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151 char[] c = iden.getType; |
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152 throw error(__LINE__, UnexpectedTokSingle) |
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153 .tok(iden) |
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154 .arg(c) |
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155 .arg(Tok.Identifier); |
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156 } |
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157 break; |
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158 case Tok.EOF: |
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159 return null; |
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160 default: |
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161 char[] c = t.getType; |
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162 throw error(__LINE__, UnexpectedTok).arg(c); |
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163 } |
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164 } |
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165 |
| 22 | 166 VarDecl[] parseStruct() |
| 167 { | |
| 168 VarDecl[] varDecls; | |
| 169 require(Tok.OpenBrace); | |
| 170 while(lexer.peek.type != Tok.CloseBrace) | |
| 171 { | |
| 172 varDecls ~= cast(VarDecl)parseDecl; | |
| 173 } | |
| 174 | |
| 175 require(Tok.CloseBrace); | |
| 176 return varDecls; | |
| 177 } | |
| 178 | |
| 1 | 179 Stmt parseStatement() |
| 180 { | |
| 181 Token t = lexer.peek; | |
| 182 | |
| 183 switch(t.type) | |
| 184 { | |
| 185 case Tok.Return: | |
| 186 lexer.next; | |
| 187 auto ret = new ReturnStmt(); | |
| 37 | 188 if (!skip(Tok.Seperator)) |
| 189 { | |
| 190 ret.exp = parseExpression(); | |
| 191 require(Tok.Seperator); | |
| 192 } | |
| 1 | 193 return ret; |
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194 |
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195 case Tok.If: |
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196 lexer.next; |
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197 require(Tok.OpenParentheses); |
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198 auto condition = parseExpression(); |
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199 require(Tok.CloseParentheses); |
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200 |
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201 auto then_body = parseBlockOrSingleStmt(); |
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202 |
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203 Stmt[] else_body; |
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204 if (lexer.peek.type == Tok.Else) |
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205 { |
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206 lexer.next; |
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207 else_body = parseBlockOrSingleStmt(); |
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208 } |
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209 |
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210 return new IfStmt(condition, then_body, else_body); |
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211 |
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212 case Tok.While: |
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213 lexer.next; |
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214 require(Tok.OpenParentheses); |
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215 auto condition = parseExpression(); |
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216 require(Tok.CloseParentheses); |
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217 return new WhileStmt(condition, parseBlockOrSingleStmt()); |
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218 |
| 1 | 219 case Tok.Identifier: |
| 220 Token n = lexer.peek(1); | |
| 221 switch(n.type) | |
| 222 { | |
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223 case Tok.Dot: |
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224 Exp iden = parseExpIdentifier(new Identifier(lexer.next)); |
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225 switch(lexer.peek.type) |
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226 { |
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227 case Tok.Assign: |
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228 lexer.next; |
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229 auto stmt = new ExpStmt(new AssignExp(iden , parseExpression())); |
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230 require(Tok.Seperator); |
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231 return stmt; |
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232 break; |
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233 } |
| 1 | 234 case Tok.Assign: |
| 235 lexer.next; | |
| 236 lexer.next; | |
| 237 auto stmt = new ExpStmt(new AssignExp(new Identifier(t), parseExpression())); | |
| 238 require(Tok.Seperator); | |
| 239 return stmt; | |
| 240 break; | |
| 22 | 241 case Tok.Identifier: |
| 242 auto decl = new DeclStmt(parseDecl()); | |
| 243 return decl; | |
| 1 | 244 |
| 245 default: | |
| 246 auto e = new ExpStmt(parseExpression()); | |
| 247 require(Tok.Seperator); | |
| 248 return e; | |
| 249 | |
| 250 } | |
| 251 break; | |
| 252 | |
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253 case Tok.Switch: |
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254 lexer.next; |
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255 require(Tok.OpenParentheses); |
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256 auto target = parseExpression(); |
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257 auto res = new SwitchStmt(target); |
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258 require(Tok.CloseParentheses); |
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259 require(Tok.OpenBrace); |
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260 while (true) |
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261 { |
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262 Stmt[] statements; |
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263 if (skip(Tok.Default)) |
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264 { |
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265 require(Tok.Colon); |
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266 statements.length = 0; |
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267 while (lexer.peek.type != Tok.Case |
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268 && lexer.peek.type != Tok.Default |
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269 && lexer.peek.type != Tok.CloseBrace) |
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270 statements ~= parseStatement(); |
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271 res.setDefault(statements); |
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272 continue; |
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273 } |
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274 |
| 37 | 275 Token _case = lexer.peek; |
| 276 if (_case.type != Tok.Case) | |
| 277 break; | |
| 278 lexer.next(); | |
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279 |
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280 IntegerLit[] literals; |
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281 do |
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282 { |
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283 Exp e = parseExpression(); |
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284 IntegerLit lit = cast(IntegerLit)e; |
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285 if (lit is null) |
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286 throw error(__LINE__, CaseValueMustBeInt) |
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287 .tok(_case); |
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288 |
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289 literals ~= lit; |
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290 } |
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291 while (skip(Tok.Comma)); |
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292 require(Tok.Colon); |
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293 |
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294 while (lexer.peek.type != Tok.Case |
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295 && lexer.peek.type != Tok.Default |
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296 && lexer.peek.type != Tok.CloseBrace) |
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297 statements ~= parseStatement(); |
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298 |
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299 res.addCase(literals, statements); |
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300 |
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301 if (lexer.peek.type == Tok.CloseBrace) |
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302 break; |
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303 } |
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304 require(Tok.CloseBrace); |
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305 return res; |
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306 |
| 1 | 307 default: |
| 308 auto decl = new DeclStmt(parseDecl()); | |
| 309 //require(Tok.Seperator); | |
| 310 return decl; | |
| 311 } | |
| 312 return new Stmt(); | |
| 313 } | |
| 314 | |
| 315 FuncDecl parseFunc(Identifier type, Identifier identifier) | |
| 316 { | |
| 317 VarDecl[] funcArgs = parseFuncArgs(); | |
| 318 | |
| 319 lexer.next; // Remove the "{" | |
| 320 | |
| 321 Stmt[] statements; | |
| 322 | |
| 323 while(lexer.peek.type != Tok.CloseBrace) | |
| 324 statements ~= parseStatement(); | |
| 325 | |
| 326 lexer.next; // Remove "}" | |
| 327 | |
| 328 return new FuncDecl(type, identifier, funcArgs, statements); | |
| 329 } | |
| 330 | |
| 331 VarDecl[] parseFuncArgs() | |
| 332 { | |
| 333 lexer.next; // Remove the "(" token. | |
| 334 | |
| 335 VarDecl[] funcArgs; | |
| 336 | |
| 337 while(lexer.peek.type != Tok.CloseParentheses) | |
| 338 { | |
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339 auto t = parseType; |
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340 auto i = parseIdentifier; |
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341 funcArgs ~= new VarDecl(t, i); |
| 1 | 342 |
| 343 if(lexer.peek.type == Tok.Comma) | |
| 344 lexer.next; | |
| 345 } | |
| 346 | |
| 347 lexer.next; // Remove the ")" | |
| 348 | |
| 349 return funcArgs; | |
| 350 } | |
| 351 | |
| 352 Identifier parseIdentifier() | |
| 353 { | |
| 354 Token identifier = lexer.next; | |
| 355 | |
| 356 switch(identifier.type) | |
| 357 { | |
| 358 case Tok.Identifier: | |
| 359 return new Identifier(identifier); | |
| 360 break; | |
| 361 default: | |
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362 throw error(__LINE__, "Unexpected token in Identifier parsing. Got %0") |
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363 .arg(identifier.getType) |
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364 .tok(identifier); |
| 1 | 365 } |
| 366 } | |
| 367 | |
| 368 Identifier parseType() | |
| 369 { | |
| 370 Token type = lexer.next; | |
| 371 | |
| 372 switch(type.type) | |
| 373 { | |
| 374 case Tok.Byte, Tok.Ubyte, | |
| 375 Tok.Short, Tok.Ushort, | |
| 376 Tok.Int, Tok.Uint, | |
| 377 Tok.Long, Tok.Ulong, | |
| 378 Tok.Float, Tok.Double, | |
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379 Tok.Bool, |
| 37 | 380 Tok.Void, |
| 1 | 381 Tok.Identifier: |
| 382 return new Identifier(type); | |
| 383 break; | |
| 384 default: | |
| 385 char[] c = type.getType; | |
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386 error(__LINE__, "Unexpected token in Type parsing. Got %0").arg(c); |
| 1 | 387 } |
| 388 } | |
| 389 | |
| 390 // -- Expression parsing -- // | |
| 391 private: | |
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392 Exp parseExpIdentifier(Exp target) |
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393 { |
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394 switch(lexer.peek.type) |
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395 { |
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396 case Tok.Dot: |
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397 switch(lexer.peek(1).type) |
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398 { |
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399 case Tok.Identifier: |
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400 lexer.next; |
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401 return parseExpIdentifier( |
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402 new MemberLookup(target, new Identifier(lexer.next))); |
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403 default: |
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404 Token t = lexer.peek(1); |
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405 throw error(__LINE__, "Expected identifier after '.'", &t); |
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406 } |
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407 default: |
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408 return target; |
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409 } |
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410 } |
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411 |
| 1 | 412 Exp parseExpression(int p = 0) |
| 413 { | |
| 414 auto exp = P(); | |
| 415 Token next = lexer.peek(); | |
| 416 BinOp* op = null; | |
| 417 while ((op = binary(next.type)) != null && op.prec >= p) | |
| 418 { | |
| 419 lexer.next(); | |
| 420 int q = op.leftAssoc? 1 + op.prec : op.prec; | |
| 421 auto exp2 = parseExpression(q); | |
| 422 exp = new BinaryExp(op.operator, exp, exp2); | |
| 423 next = lexer.peek(); | |
| 424 } | |
| 425 | |
| 426 return exp; | |
| 427 } | |
| 428 | |
| 429 Exp P() | |
| 430 { | |
| 431 Token next = lexer.next(); | |
| 432 if (auto op = unary(next.type)) | |
| 433 return new NegateExp(parseExpression(op.prec)); | |
| 434 else if (next.type == Tok.OpenParentheses) | |
| 435 { | |
| 436 auto e = parseExpression(0); | |
| 437 require(Tok.CloseParentheses); | |
| 438 return e; | |
| 439 } | |
| 440 else if (next.type == Tok.Identifier) | |
| 441 { | |
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442 Exp iden = parseExpIdentifier(new Identifier(next)); |
| 1 | 443 switch(lexer.peek.type) |
| 444 { | |
| 445 case Tok.OpenParentheses: | |
| 446 lexer.next; | |
| 447 Exp[] args; | |
| 448 while(lexer.peek.type != Tok.CloseParentheses) | |
| 449 { | |
| 450 if(lexer.peek.type == Tok.Comma) | |
| 451 { | |
| 452 lexer.next; | |
| 453 } | |
| 454 args ~= parseExpression(); | |
| 455 } | |
| 456 | |
| 457 lexer.next(); | |
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458 return new CallExp(iden, args); |
| 1 | 459 |
| 460 default: | |
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461 return iden; |
| 1 | 462 } |
| 463 } | |
| 464 else if (next.type == Tok.Integer) | |
| 465 return new IntegerLit(next); | |
| 466 | |
| 467 Stdout.formatln("{}", next.getType); | |
| 468 assert(0, "Should not happen"); | |
| 469 } | |
| 470 | |
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471 private Stmt[] parseBlockOrSingleStmt() |
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472 { |
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473 Stmt[] stmts; |
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474 if (lexer.peek.type == Tok.OpenBrace) |
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475 { |
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476 lexer.next; |
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477 while(lexer.peek.type != Tok.CloseBrace) |
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478 stmts ~= parseStatement(); |
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479 lexer.next; |
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480 } |
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481 else |
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482 stmts ~= parseStatement(); |
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483 |
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484 return stmts; |
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485 } |
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486 |
| 1 | 487 struct UnOp |
| 488 { | |
| 489 Tok tokenType; | |
| 490 int prec; | |
| 491 } | |
| 492 | |
| 493 static UnOp[] _unary = [{Tok.Sub, 4}]; | |
| 494 UnOp* unary(Tok t) | |
| 495 { | |
| 496 foreach (ref op; _unary) | |
| 497 if (op.tokenType == t) | |
| 498 return &op; | |
| 499 return null; | |
| 500 } | |
| 501 | |
| 502 struct BinOp | |
| 503 { | |
| 504 Tok tokenType; | |
| 505 int prec; | |
| 506 bool leftAssoc; | |
| 507 BinaryExp.Operator operator; | |
| 508 } | |
| 509 | |
| 510 static BinOp[] _binary = | |
| 511 [ | |
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512 {Tok.Eq, 2, true, BinaryExp.Operator.Eq}, |
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513 {Tok.Ne, 2, true, BinaryExp.Operator.Ne}, |
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514 {Tok.Lt, 2, true, BinaryExp.Operator.Lt}, |
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515 {Tok.Le, 2, true, BinaryExp.Operator.Le}, |
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516 {Tok.Gt, 2, true, BinaryExp.Operator.Gt}, |
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517 {Tok.Ge, 2, true, BinaryExp.Operator.Ge}, |
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518 |
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519 {Tok.Add, 3, true, BinaryExp.Operator.Add}, |
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520 {Tok.Sub, 3, true, BinaryExp.Operator.Sub}, |
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521 |
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522 {Tok.Mul, 5, true, BinaryExp.Operator.Mul}, |
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523 {Tok.Div, 5, true, BinaryExp.Operator.Div} |
| 1 | 524 ]; |
| 525 BinOp* binary(Tok t) | |
| 526 { | |
| 527 foreach (ref op; _binary) | |
| 528 if (op.tokenType == t) | |
| 529 return &op; | |
| 530 return null; | |
| 531 } | |
| 532 | |
| 533 private: | |
| 534 | |
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535 Token require(Tok t) |
| 1 | 536 { |
| 537 if (lexer.peek().type != t) | |
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538 throw error(__LINE__, UnexpectedTokSingle) |
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539 .arg(lexer.peek.getType) |
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540 .arg(t); |
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541 return lexer.next(); |
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542 } |
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543 |
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544 bool skip(Tok t) |
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545 { |
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546 if (lexer.peek().type != t) |
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547 return false; |
| 1 | 548 lexer.next(); |
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549 return true; |
| 1 | 550 } |
| 551 | |
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552 Error error(uint line, char[] errMsg, Token* tok = null) |
| 1 | 553 { |
|
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554 Location loc; |
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555 if (tok is null) |
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556 loc = lexer.peek.location; |
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557 else |
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558 loc = tok.location; |
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559 auto e = |
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560 new Error("Parser.d(" ~ Integer.toString(line) ~ "): " ~errMsg); |
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561 e.loc(loc); |
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562 if (tok !is null) |
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563 e.tok(*tok); |
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564 return e; |
| 1 | 565 } |
| 566 | |
|
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567 static char[] |
|
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568 UnexpectedTokMulti = "Unexpected token, got %0 expected one of %1", |
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569 UnexpectedTokSingle = "Unexpected token, got %0 expected %1", |
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570 UnexpectedTok = "Unexpected token %0"; |
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571 |
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572 static char[] |
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573 CaseValueMustBeInt = "Cases can only be integer literals"; |
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574 |
| 1 | 575 Lexer lexer; |
| 576 } |