Mercurial > projects > dang
annotate parser/Parser.d @ 36:ce17bea8e9bd new_gen
Switch statements support
Can only switch on IntegerLit's but multiple values per case and the
default are supported.
An error is emitted if a value is used multiple times or if theres is more
than one default block
| author | Anders Halager <halager@gmail.com> |
|---|---|
| date | Sun, 20 Apr 2008 22:39:07 +0200 |
| parents | 084c2c147c4f |
| children | 858b9805843d |
| 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: | |
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72 char[] c = p.getType; |
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73 throw error(__LINE__, UnexpectedTokMulti) |
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74 .tok(p) |
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75 .arg(c) |
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76 .arg(Tok.OpenParentheses, Tok.Seperator, Tok.Assign); |
| 1 | 77 } |
| 78 break; | |
| 79 default: | |
| 80 char[] c = t.getType; | |
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81 throw error(__LINE__, UnexpectedTok).tok(iden).arg(c); |
| 1 | 82 } |
| 83 break; | |
| 22 | 84 case Tok.Struct: |
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85 lexer.next; |
| 22 | 86 Token iden = lexer.next; |
| 87 switch(iden.type) | |
| 88 { | |
| 89 case Tok.Identifier: | |
| 90 Identifier identifier = new Identifier(iden); | |
| 91 return new StructDecl (identifier, parseStruct()); | |
| 92 default: | |
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93 throw error(__LINE__, "Expected struct identifier, but got %0").arg(iden.getType); |
| 22 | 94 } |
| 1 | 95 case Tok.EOF: |
| 96 return null; | |
| 97 default: | |
| 98 char[] c = t.getType; | |
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99 throw error(__LINE__, UnexpectedTok).tok(t).arg(c); |
| 1 | 100 } |
| 101 } | |
| 102 | |
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103 Decl parseDecl() |
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104 { |
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105 Token t = lexer.peek; |
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106 |
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107 switch(t.type) |
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108 { |
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109 case Tok.Byte, Tok.Ubyte, |
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110 Tok.Short, Tok.Ushort, |
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111 Tok.Int, Tok.Uint, |
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112 Tok.Long, Tok.Ulong, |
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113 Tok.Float, Tok.Double, |
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114 Tok.Bool, |
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115 Tok.Identifier: |
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116 Identifier type = new Identifier(t); |
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117 |
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118 Token iden = lexer.peek(1); |
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119 |
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120 switch(iden.type) |
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121 { |
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122 case Tok.Identifier: |
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123 Identifier identifier = new Identifier(iden); |
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124 Token p = lexer.peek(2); |
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125 switch(p.type) |
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126 { |
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127 case Tok.OpenParentheses: |
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128 lexer.next; lexer.next; |
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129 return parseFunc(type, identifier); |
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130 case Tok.Seperator: |
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131 lexer.next; lexer.next; |
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132 require(Tok.Seperator); |
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133 return new VarDecl(type, identifier, null); |
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134 case Tok.Assign: |
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135 lexer.next; lexer.next; |
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136 lexer.next(); |
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137 auto exp = parseExpression(); |
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138 require(Tok.Seperator); |
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139 return new VarDecl(type, identifier, exp); |
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140 default: |
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141 char[] c = p.getType; |
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142 throw error(__LINE__, UnexpectedTokMulti) |
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143 .tok(p) |
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144 .arg(c) |
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145 .arg(Tok.OpenParentheses, Tok.Seperator, Tok.Assign); |
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146 } |
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147 break; |
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148 default: |
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149 char[] c = iden.getType; |
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150 throw error(__LINE__, UnexpectedTokSingle) |
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151 .tok(iden) |
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152 .arg(c) |
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153 .arg(Tok.Identifier); |
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154 } |
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155 break; |
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156 case Tok.EOF: |
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157 return null; |
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158 default: |
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159 char[] c = t.getType; |
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160 throw error(__LINE__, UnexpectedTok).arg(c); |
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161 } |
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162 } |
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163 |
| 22 | 164 VarDecl[] parseStruct() |
| 165 { | |
| 166 VarDecl[] varDecls; | |
| 167 require(Tok.OpenBrace); | |
| 168 while(lexer.peek.type != Tok.CloseBrace) | |
| 169 { | |
| 170 varDecls ~= cast(VarDecl)parseDecl; | |
| 171 } | |
| 172 | |
| 173 require(Tok.CloseBrace); | |
| 174 return varDecls; | |
| 175 } | |
| 176 | |
| 1 | 177 Stmt parseStatement() |
| 178 { | |
| 179 Token t = lexer.peek; | |
| 180 | |
| 181 switch(t.type) | |
| 182 { | |
| 183 case Tok.Return: | |
| 184 lexer.next; | |
| 185 auto ret = new ReturnStmt(); | |
| 186 ret.exp = parseExpression(); | |
| 187 require(Tok.Seperator); | |
| 188 return ret; | |
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189 |
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190 case Tok.If: |
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191 lexer.next; |
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192 require(Tok.OpenParentheses); |
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193 auto condition = parseExpression(); |
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194 require(Tok.CloseParentheses); |
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195 |
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196 auto then_body = parseBlockOrSingleStmt(); |
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197 |
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198 Stmt[] else_body; |
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199 if (lexer.peek.type == Tok.Else) |
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200 { |
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201 lexer.next; |
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202 else_body = parseBlockOrSingleStmt(); |
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203 } |
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204 |
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205 return new IfStmt(condition, then_body, else_body); |
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206 |
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207 case Tok.While: |
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208 lexer.next; |
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209 require(Tok.OpenParentheses); |
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210 auto condition = parseExpression(); |
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211 require(Tok.CloseParentheses); |
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212 return new WhileStmt(condition, parseBlockOrSingleStmt()); |
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213 |
| 1 | 214 case Tok.Identifier: |
| 215 Token n = lexer.peek(1); | |
| 216 switch(n.type) | |
| 217 { | |
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218 case Tok.Dot: |
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219 Exp iden = parseExpIdentifier(new Identifier(lexer.next)); |
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220 switch(lexer.peek.type) |
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221 { |
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222 case Tok.Assign: |
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223 lexer.next; |
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224 auto stmt = new ExpStmt(new AssignExp(iden , parseExpression())); |
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225 require(Tok.Seperator); |
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226 return stmt; |
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227 break; |
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228 } |
| 1 | 229 case Tok.Assign: |
| 230 lexer.next; | |
| 231 lexer.next; | |
| 232 auto stmt = new ExpStmt(new AssignExp(new Identifier(t), parseExpression())); | |
| 233 require(Tok.Seperator); | |
| 234 return stmt; | |
| 235 break; | |
| 22 | 236 case Tok.Identifier: |
| 237 auto decl = new DeclStmt(parseDecl()); | |
| 238 return decl; | |
| 1 | 239 |
| 240 default: | |
| 241 auto e = new ExpStmt(parseExpression()); | |
| 242 require(Tok.Seperator); | |
| 243 return e; | |
| 244 | |
| 245 } | |
| 246 break; | |
| 247 | |
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248 case Tok.Switch: |
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249 lexer.next; |
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250 require(Tok.OpenParentheses); |
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251 auto target = parseExpression(); |
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252 auto res = new SwitchStmt(target); |
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253 require(Tok.CloseParentheses); |
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254 require(Tok.OpenBrace); |
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255 while (true) |
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256 { |
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257 Stmt[] statements; |
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258 if (skip(Tok.Default)) |
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259 { |
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260 require(Tok.Colon); |
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261 statements.length = 0; |
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262 while (lexer.peek.type != Tok.Case |
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263 && lexer.peek.type != Tok.Default |
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264 && lexer.peek.type != Tok.CloseBrace) |
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265 statements ~= parseStatement(); |
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266 res.setDefault(statements); |
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267 continue; |
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268 } |
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269 |
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270 Token _case = require(Tok.Case); |
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271 |
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272 IntegerLit[] literals; |
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273 do |
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274 { |
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275 Exp e = parseExpression(); |
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276 IntegerLit lit = cast(IntegerLit)e; |
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277 if (lit is null) |
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278 throw error(__LINE__, CaseValueMustBeInt) |
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279 .tok(_case); |
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280 |
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281 literals ~= lit; |
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282 } |
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283 while (skip(Tok.Comma)); |
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284 require(Tok.Colon); |
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285 |
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286 while (lexer.peek.type != Tok.Case |
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287 && lexer.peek.type != Tok.Default |
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288 && lexer.peek.type != Tok.CloseBrace) |
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289 statements ~= parseStatement(); |
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290 |
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291 res.addCase(literals, statements); |
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292 |
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293 if (lexer.peek.type == Tok.CloseBrace) |
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294 break; |
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295 } |
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296 require(Tok.CloseBrace); |
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297 return res; |
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298 |
| 1 | 299 default: |
| 300 auto decl = new DeclStmt(parseDecl()); | |
| 301 //require(Tok.Seperator); | |
| 302 return decl; | |
| 303 } | |
| 304 return new Stmt(); | |
| 305 } | |
| 306 | |
| 307 FuncDecl parseFunc(Identifier type, Identifier identifier) | |
| 308 { | |
| 309 VarDecl[] funcArgs = parseFuncArgs(); | |
| 310 | |
| 311 lexer.next; // Remove the "{" | |
| 312 | |
| 313 Stmt[] statements; | |
| 314 | |
| 315 while(lexer.peek.type != Tok.CloseBrace) | |
| 316 statements ~= parseStatement(); | |
| 317 | |
| 318 lexer.next; // Remove "}" | |
| 319 | |
| 320 return new FuncDecl(type, identifier, funcArgs, statements); | |
| 321 } | |
| 322 | |
| 323 VarDecl[] parseFuncArgs() | |
| 324 { | |
| 325 lexer.next; // Remove the "(" token. | |
| 326 | |
| 327 VarDecl[] funcArgs; | |
| 328 | |
| 329 while(lexer.peek.type != Tok.CloseParentheses) | |
| 330 { | |
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331 auto t = parseType; |
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332 auto i = parseIdentifier; |
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333 funcArgs ~= new VarDecl(t, i); |
| 1 | 334 |
| 335 if(lexer.peek.type == Tok.Comma) | |
| 336 lexer.next; | |
| 337 } | |
| 338 | |
| 339 lexer.next; // Remove the ")" | |
| 340 | |
| 341 return funcArgs; | |
| 342 } | |
| 343 | |
| 344 Identifier parseIdentifier() | |
| 345 { | |
| 346 Token identifier = lexer.next; | |
| 347 | |
| 348 switch(identifier.type) | |
| 349 { | |
| 350 case Tok.Identifier: | |
| 351 return new Identifier(identifier); | |
| 352 break; | |
| 353 default: | |
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354 throw error(__LINE__, "Unexpected token in Identifier parsing. Got %0") |
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355 .arg(identifier.getType) |
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356 .tok(identifier); |
| 1 | 357 } |
| 358 } | |
| 359 | |
| 360 Identifier parseType() | |
| 361 { | |
| 362 Token type = lexer.next; | |
| 363 | |
| 364 switch(type.type) | |
| 365 { | |
| 366 case Tok.Byte, Tok.Ubyte, | |
| 367 Tok.Short, Tok.Ushort, | |
| 368 Tok.Int, Tok.Uint, | |
| 369 Tok.Long, Tok.Ulong, | |
| 370 Tok.Float, Tok.Double, | |
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371 Tok.Bool, |
| 1 | 372 Tok.Identifier: |
| 373 return new Identifier(type); | |
| 374 break; | |
| 375 default: | |
| 376 char[] c = type.getType; | |
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377 error(__LINE__, "Unexpected token in Type parsing. Got %0").arg(c); |
| 1 | 378 } |
| 379 } | |
| 380 | |
| 381 // -- Expression parsing -- // | |
| 382 private: | |
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383 Exp parseExpIdentifier(Exp target) |
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384 { |
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385 switch(lexer.peek.type) |
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386 { |
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387 case Tok.Dot: |
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388 switch(lexer.peek(1).type) |
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389 { |
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390 case Tok.Identifier: |
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391 lexer.next; |
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392 return parseExpIdentifier( |
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393 new MemberLookup(target, new Identifier(lexer.next))); |
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394 default: |
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395 Token t = lexer.peek(1); |
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396 throw error(__LINE__, "Expected identifier after '.'", &t); |
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397 } |
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398 default: |
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399 return target; |
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400 } |
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401 } |
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402 |
| 1 | 403 Exp parseExpression(int p = 0) |
| 404 { | |
| 405 auto exp = P(); | |
| 406 Token next = lexer.peek(); | |
| 407 BinOp* op = null; | |
| 408 while ((op = binary(next.type)) != null && op.prec >= p) | |
| 409 { | |
| 410 lexer.next(); | |
| 411 int q = op.leftAssoc? 1 + op.prec : op.prec; | |
| 412 auto exp2 = parseExpression(q); | |
| 413 exp = new BinaryExp(op.operator, exp, exp2); | |
| 414 next = lexer.peek(); | |
| 415 } | |
| 416 | |
| 417 return exp; | |
| 418 } | |
| 419 | |
| 420 Exp P() | |
| 421 { | |
| 422 Token next = lexer.next(); | |
| 423 if (auto op = unary(next.type)) | |
| 424 return new NegateExp(parseExpression(op.prec)); | |
| 425 else if (next.type == Tok.OpenParentheses) | |
| 426 { | |
| 427 auto e = parseExpression(0); | |
| 428 require(Tok.CloseParentheses); | |
| 429 return e; | |
| 430 } | |
| 431 else if (next.type == Tok.Identifier) | |
| 432 { | |
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433 Exp iden = parseExpIdentifier(new Identifier(next)); |
| 1 | 434 switch(lexer.peek.type) |
| 435 { | |
| 436 case Tok.OpenParentheses: | |
| 437 lexer.next; | |
| 438 Exp[] args; | |
| 439 while(lexer.peek.type != Tok.CloseParentheses) | |
| 440 { | |
| 441 if(lexer.peek.type == Tok.Comma) | |
| 442 { | |
| 443 lexer.next; | |
| 444 } | |
| 445 args ~= parseExpression(); | |
| 446 } | |
| 447 | |
| 448 lexer.next(); | |
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449 return new CallExp(iden, args); |
| 1 | 450 |
| 451 default: | |
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452 return iden; |
| 1 | 453 } |
| 454 } | |
| 455 else if (next.type == Tok.Integer) | |
| 456 return new IntegerLit(next); | |
| 457 | |
| 458 Stdout.formatln("{}", next.getType); | |
| 459 assert(0, "Should not happen"); | |
| 460 } | |
| 461 | |
|
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462 private Stmt[] parseBlockOrSingleStmt() |
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463 { |
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464 Stmt[] stmts; |
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465 if (lexer.peek.type == Tok.OpenBrace) |
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466 { |
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467 lexer.next; |
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468 while(lexer.peek.type != Tok.CloseBrace) |
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469 stmts ~= parseStatement(); |
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470 lexer.next; |
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471 } |
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472 else |
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473 stmts ~= parseStatement(); |
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474 |
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475 return stmts; |
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476 } |
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477 |
| 1 | 478 struct UnOp |
| 479 { | |
| 480 Tok tokenType; | |
| 481 int prec; | |
| 482 } | |
| 483 | |
| 484 static UnOp[] _unary = [{Tok.Sub, 4}]; | |
| 485 UnOp* unary(Tok t) | |
| 486 { | |
| 487 foreach (ref op; _unary) | |
| 488 if (op.tokenType == t) | |
| 489 return &op; | |
| 490 return null; | |
| 491 } | |
| 492 | |
| 493 struct BinOp | |
| 494 { | |
| 495 Tok tokenType; | |
| 496 int prec; | |
| 497 bool leftAssoc; | |
| 498 BinaryExp.Operator operator; | |
| 499 } | |
| 500 | |
| 501 static BinOp[] _binary = | |
| 502 [ | |
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503 {Tok.Eq, 2, true, BinaryExp.Operator.Eq}, |
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504 {Tok.Ne, 2, true, BinaryExp.Operator.Ne}, |
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505 {Tok.Lt, 2, true, BinaryExp.Operator.Lt}, |
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506 {Tok.Le, 2, true, BinaryExp.Operator.Le}, |
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507 {Tok.Gt, 2, true, BinaryExp.Operator.Gt}, |
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508 {Tok.Ge, 2, true, BinaryExp.Operator.Ge}, |
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509 |
|
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510 {Tok.Add, 3, true, BinaryExp.Operator.Add}, |
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511 {Tok.Sub, 3, true, BinaryExp.Operator.Sub}, |
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512 |
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513 {Tok.Mul, 5, true, BinaryExp.Operator.Mul}, |
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514 {Tok.Div, 5, true, BinaryExp.Operator.Div} |
| 1 | 515 ]; |
| 516 BinOp* binary(Tok t) | |
| 517 { | |
| 518 foreach (ref op; _binary) | |
| 519 if (op.tokenType == t) | |
| 520 return &op; | |
| 521 return null; | |
| 522 } | |
| 523 | |
| 524 private: | |
| 525 | |
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526 Token require(Tok t) |
| 1 | 527 { |
| 528 if (lexer.peek().type != t) | |
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529 throw error(__LINE__, UnexpectedTokSingle) |
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530 .arg(lexer.peek.getType) |
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531 .arg(t); |
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532 return lexer.next(); |
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533 } |
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534 |
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535 bool skip(Tok t) |
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536 { |
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537 if (lexer.peek().type != t) |
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538 return false; |
| 1 | 539 lexer.next(); |
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540 return true; |
| 1 | 541 } |
| 542 | |
|
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543 Error error(uint line, char[] errMsg, Token* tok = null) |
| 1 | 544 { |
|
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545 Location loc; |
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546 if (tok is null) |
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547 loc = lexer.peek.location; |
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548 else |
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549 loc = tok.location; |
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550 auto e = |
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551 new Error("Parser.d(" ~ Integer.toString(line) ~ "): " ~errMsg); |
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552 e.loc(loc); |
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553 if (tok !is null) |
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554 e.tok(*tok); |
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555 return e; |
| 1 | 556 } |
| 557 | |
|
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558 static char[] |
|
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559 UnexpectedTokMulti = "Unexpected token, got %0 expected one of %1", |
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560 UnexpectedTokSingle = "Unexpected token, got %0 expected %1", |
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561 UnexpectedTok = "Unexpected token %0"; |
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|
562 |
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|
563 static char[] |
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|
564 CaseValueMustBeInt = "Cases can only be integer literals"; |
|
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565 |
| 1 | 566 Lexer lexer; |
| 567 } |