Mercurial > projects > dang
annotate parser/Parser.d @ 75:86aec2160221 new_gen
Parsing "int* x"
author | Anders Johnsen <skabet@gmail.com> |
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date | Fri, 02 May 2008 15:05:02 +0200 |
parents | 192da4976daa |
children | 9171f04dd9ee |
rev | line source |
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1 | 1 module parser.Parser; |
2 | |
3 import lexer.Lexer, | |
4 lexer.Token; | |
5 | |
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6 import parser.Action; |
1 | 7 |
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8 import misc.Error; |
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9 |
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10 import basic.SmallArray; |
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11 |
1 | 12 import tango.io.Stdout, |
13 Integer = tango.text.convert.Integer; | |
14 | |
15 class Parser | |
16 { | |
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17 Action action; |
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18 alias Object Exp; |
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19 alias Object Stmt; |
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20 alias Object Decl; |
1 | 21 |
22 public: | |
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23 Decl[] parse(Lexer lexer, Action act) |
1 | 24 { |
25 this.lexer = lexer; | |
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26 action = act; |
1 | 27 |
28 Decl[] declarations; | |
29 | |
30 while(lexer.peek.type != Tok.EOF) | |
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31 declarations ~= parseDecl(); |
1 | 32 |
33 return declarations; | |
34 } | |
35 | |
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36 Decl parseDecl() |
1 | 37 { |
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38 Token t = lexer.peek; |
1 | 39 |
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40 if (t.isBasicType || t.isIdentifier) |
1 | 41 { |
75 | 42 Id type = parseType;//Id(lexer.next); |
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43 Id iden = Id(require(Tok.Identifier)); |
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44 Token next = lexer.peek(); |
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45 if (next.type == Tok.Seperator) |
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46 { |
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47 Token sep = lexer.next(); |
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48 return action.actOnDeclarator(type, iden, null); |
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49 } |
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50 else if (next.type == Tok.Assign) |
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51 { |
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52 Token assign = lexer.next(); |
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53 Exp exp = parseExpression(); |
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54 require(Tok.Seperator); |
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55 return action.actOnDeclarator(type, iden, exp); |
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56 } |
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57 else if (next.type == Tok.OpenParentheses) |
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58 return parseFunc(type, iden); |
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59 else |
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60 throw error(__LINE__, PE.UnexpectedTok) |
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61 .tok(next) |
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62 .arg(next.getType); |
1 | 63 } |
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64 else if (t.type == Tok.Struct) |
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65 { |
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66 Id type = Id(lexer.next); |
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67 Id iden = Id(require(Tok.Identifier)); |
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68 |
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69 return parseStruct(type, iden); |
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70 } |
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71 char[] c = t.getType; |
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72 throw error(__LINE__, PE.UnexpectedTok).tok(t).arg(c); |
1 | 73 } |
74 | |
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75 /** |
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76 Parse struct |
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77 */ |
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78 Decl parseStruct(Id type, Id iden) |
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79 { |
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80 auto decl = action.actOnDeclarator(type, iden, null); |
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81 |
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82 require(Tok.OpenBrace); |
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83 |
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84 while(lexer.peek.isBasicType || lexer.peek.isIdentifier) |
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85 { |
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86 Id var_type = Id(lexer.next); |
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87 Id var_iden = Id(require(Tok.Identifier)); |
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88 Token next = lexer.peek(); |
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89 if (next.type == Tok.Seperator) |
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90 { |
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91 Token sep = lexer.next(); |
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92 action.actOnStructMember(decl, var_type, var_iden, null); |
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93 continue; |
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94 } |
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95 else if (next.type == Tok.Assign) |
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96 { |
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97 Token assign = lexer.next(); |
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98 Exp exp = parseExpression(); |
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99 require(Tok.Seperator); |
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100 action.actOnStructMember(decl, var_type, var_iden, exp); |
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101 continue; |
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102 } |
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103 throw error(__LINE__, PE.UnexpectedTok) |
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104 .tok(next).arg(next.getType); |
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105 } |
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106 |
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107 require(Tok.CloseBrace); |
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108 |
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109 return decl; |
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110 } |
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111 /** |
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112 Parse statements. |
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113 |
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114 This is the place to attack! |
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115 */ |
1 | 116 Stmt parseStatement() |
117 { | |
118 Token t = lexer.peek; | |
119 | |
120 switch(t.type) | |
121 { | |
122 case Tok.Return: | |
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123 Token ret = lexer.next; |
46 | 124 Exp exp; |
125 if (lexer.peek.type != Tok.Seperator) | |
126 exp = parseExpression(); | |
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127 require(Tok.Seperator); |
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128 return action.actOnReturnStmt(ret, exp); |
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129 |
45 | 130 /* |
131 if (cond) | |
132 single statement | compound statement | |
133 [else | |
134 single statement | compound statement] | |
135 */ | |
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136 case Tok.If: |
45 | 137 Token _if = lexer.next(); |
138 | |
139 require(Tok.OpenParentheses); | |
140 Exp cond = parseExpression(); | |
141 require(Tok.CloseParentheses); | |
142 | |
143 Stmt thenB = parseSingleOrCompoundStatement(); | |
144 | |
145 // if there is no else part we use the if as token, to have | |
146 // something than can be passed along | |
147 Token _else = _if; | |
148 Stmt elseB; | |
149 if (lexer.peek.type == Tok.Else) | |
150 { | |
151 _else = lexer.next; | |
152 elseB = parseSingleOrCompoundStatement(); | |
153 } | |
154 | |
155 return action.actOnIfStmt(_if, cond, thenB, _else, elseB); | |
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156 |
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157 /* |
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158 while (cond) |
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159 single statement | compound statement |
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160 */ |
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161 case Tok.While: |
46 | 162 Token _while = lexer.next; |
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163 require(Tok.OpenParentheses); |
46 | 164 Exp cond = parseExpression(); |
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165 require(Tok.CloseParentheses); |
46 | 166 Stmt bodyStmt = parseSingleOrCompoundStatement(); |
167 return action.actOnWhileStmt(_while, cond, bodyStmt); | |
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168 |
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169 /* |
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170 One of four things: |
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171 A declaration of a function/variable `type id ...` |
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172 A direct assignment `id = exp;` |
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173 An indirect assignment `id.id = exp` |
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174 Some sort of free standing expression |
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175 |
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176 The assignments should be handled as binary expressions? |
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177 */ |
1 | 178 case Tok.Identifier: |
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179 Token iden = lexer.peek; |
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180 Token n = lexer.peek(1); |
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181 // Must be an decl, if we start with a basic type, or two |
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182 // identifiers in a row |
75 | 183 if (iden.isBasicType() || iden.isIdentifier()) |
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184 { |
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185 // manually hardcoded to only support "type id [= exp];" |
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186 // as that is the only thing the codegen understands |
75 | 187 Id type = parseType; |
188 n = lexer.peek(); | |
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189 Id id = Id(lexer.next); |
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190 Exp init; |
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191 if (skip(Tok.Assign)) |
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192 init = parseExpression(); |
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193 require(Tok.Seperator); |
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194 Decl d = action.actOnDeclarator(type, id, init); |
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195 return action.actOnDeclStmt(d); |
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196 } |
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197 // Expression: a.b, a = b, a(b) etc. |
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198 else |
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199 { |
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200 Exp exp = parseExpression(); |
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201 require(Tok.Seperator); |
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202 return action.actOnExprStmt(exp); |
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203 } |
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204 break; |
1 | 205 |
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206 case Tok.Switch: |
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207 throw error(__LINE__, ":(").tok(lexer.peek); |
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208 return null; |
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209 |
1 | 210 default: |
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211 if (t.isBasicType()) |
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212 goto case Tok.Identifier; |
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213 throw error(__LINE__, "Unexpexted begining of statement.").tok(lexer.peek); |
1 | 214 } |
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215 throw error(__LINE__, "").tok(t); |
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216 return null; |
1 | 217 } |
218 | |
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219 /** |
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220 Parses a function/method given the already parsed return type and name |
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221 */ |
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222 Decl parseFunc(ref Id type, ref Id name) |
1 | 223 { |
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224 Decl func = action.actOnStartOfFunctionDef(type, name); |
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225 parseFuncArgs(func); |
1 | 226 |
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227 Stmt stmt = parseCompoundStatement(); |
1 | 228 |
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229 return action.actOnEndOfFunction(func, stmt); |
1 | 230 } |
231 | |
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232 /** |
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233 Parse the function arguments, assumes current token is (. |
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234 |
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235 Both the intitial paren and the ending paren is consumed. |
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236 */ |
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237 void parseFuncArgs(Decl func) |
1 | 238 { |
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239 require(Tok.OpenParentheses); // Remove the "(" token. |
1 | 240 |
241 while(lexer.peek.type != Tok.CloseParentheses) | |
242 { | |
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243 auto t = parseType(); |
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244 auto i = parseIdentifier(); |
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245 action.addFuncArg(func, t, i); |
1 | 246 |
247 if(lexer.peek.type == Tok.Comma) | |
248 lexer.next; | |
249 } | |
250 | |
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251 require(Tok.CloseParentheses); // Remove the ")" |
1 | 252 } |
253 | |
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254 /** |
45 | 255 Parse either a block, or a single statement as allowed after if, while |
256 and for. | |
257 */ | |
258 Stmt parseSingleOrCompoundStatement() | |
259 { | |
260 if (lexer.peek.type == Tok.OpenBrace) | |
261 return parseCompoundStatement(); | |
262 return parseStatement(); | |
263 } | |
264 /** | |
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265 Parses a function-body or similar, expects { to be current token. |
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266 |
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267 Will consume both the starting { and ending } |
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268 */ |
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269 Stmt parseCompoundStatement() |
1 | 270 { |
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271 Token lbrace = require(Tok.OpenBrace); |
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272 SmallArray!(Stmt, 32) stmts; // Try to use the stack only |
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273 while (lexer.peek.type != Tok.CloseBrace) |
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274 stmts ~= parseStatement(); |
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275 Token rbrace = require(Tok.CloseBrace); |
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276 return action.actOnCompoundStmt(lbrace, rbrace, stmts.unsafe()); |
1 | 277 } |
278 | |
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279 Id parseIdentifier() |
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280 { |
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281 Token tok = lexer.next; |
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282 |
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283 if (tok.type is Tok.Identifier) |
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284 return Id(tok); |
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285 |
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286 throw error(__LINE__, PE.UnexpectedTokSingle) |
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287 .arg(tok.getType) |
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288 .arg(Tok.Identifier) |
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289 .tok(tok); |
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290 } |
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291 |
75 | 292 /** |
293 Parse a type - this includes pointer and array(at some point) types. | |
294 */ | |
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295 Id parseType() |
1 | 296 { |
297 Token type = lexer.next; | |
298 | |
75 | 299 Id currentType; |
300 | |
301 if ( !(type.isBasicType || type.type == Tok.Identifier) ) | |
302 throw error(__LINE__, "Unexpected token in Type parsing. Got %0") | |
303 .arg(type.getType) | |
304 .tok(type); | |
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305 |
75 | 306 currentType = Id(type); |
307 type = lexer.peek; | |
308 | |
309 while(type.type == Tok.Star) | |
310 { | |
311 currentType = PointerId(currentType); | |
312 lexer.next; | |
313 type = lexer.peek; | |
314 } | |
315 | |
316 return currentType; | |
1 | 317 } |
318 | |
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319 private: |
1 | 320 // -- Expression parsing -- // |
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321 Exp parseExpIdentifier(Exp target) |
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322 { |
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323 switch(lexer.peek.type) |
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324 { |
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325 case Tok.Dot: |
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326 switch(lexer.peek(1).type) |
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327 { |
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328 case Tok.Identifier: |
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329 Token op = lexer.next; |
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330 Id member = Id(lexer.next); |
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331 Exp exp = action.actOnMemberReference(target, op.location, member); |
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332 return parseExpIdentifier(exp); |
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333 default: |
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334 Token t = lexer.peek(1); |
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335 throw error(__LINE__, "Expected identifier after '.'").tok(t); |
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336 } |
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337 default: |
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338 return target; |
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339 } |
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340 } |
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341 |
1 | 342 Exp parseExpression(int p = 0) |
343 { | |
344 auto exp = P(); | |
345 Token next = lexer.peek(); | |
346 BinOp* op = null; | |
347 while ((op = binary(next.type)) != null && op.prec >= p) | |
348 { | |
349 lexer.next(); | |
350 int q = op.leftAssoc? 1 + op.prec : op.prec; | |
351 auto exp2 = parseExpression(q); | |
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352 exp = action.actOnBinaryOp(op.operator, exp, exp2); |
1 | 353 next = lexer.peek(); |
354 } | |
355 | |
356 return exp; | |
357 } | |
358 | |
359 Exp P() | |
360 { | |
361 Token next = lexer.next(); | |
362 if (auto op = unary(next.type)) | |
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363 return action.actOnUnaryOp(next, parseExpression(op.prec)); |
1 | 364 else if (next.type == Tok.OpenParentheses) |
365 { | |
366 auto e = parseExpression(0); | |
367 require(Tok.CloseParentheses); | |
368 return e; | |
369 } | |
370 else if (next.type == Tok.Identifier) | |
371 { | |
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372 Exp value = action.actOnIdentifierExp(Id(next)); |
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373 Exp iden = parseExpIdentifier(value); |
1 | 374 switch(lexer.peek.type) |
375 { | |
376 case Tok.OpenParentheses: | |
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377 Token lp = lexer.next; |
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378 SmallArray!(Exp, 8) args; |
1 | 379 while(lexer.peek.type != Tok.CloseParentheses) |
380 { | |
381 if(lexer.peek.type == Tok.Comma) | |
382 lexer.next; | |
383 args ~= parseExpression(); | |
384 } | |
385 | |
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386 Token rp = lexer.next(); |
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387 return action.actOnCallExpr(iden, lp, args.unsafe(), rp); |
1 | 388 |
389 default: | |
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390 return iden; |
1 | 391 } |
392 } | |
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393 else if (next.type == Tok.Cast) |
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394 return parseCast(); |
1 | 395 else if (next.type == Tok.Integer) |
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396 return action.actOnNumericConstant(next); |
1 | 397 |
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398 throw error(__LINE__, "Expected expression, not '"~next.getType~"'").tok(next); |
1 | 399 assert(0, "Should not happen"); |
400 } | |
401 | |
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402 Exp parseCast() |
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403 { |
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404 require(Tok.OpenParentheses); |
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405 auto next = lexer.next; |
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406 if(!next.isBasicType && !next.isIdentifier) |
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407 throw error(__LINE__, "Expected cast type, not "~next.get).tok(next); |
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A LOT of bug fixing - also implemented implicit casts. If you do a --ast-dump-code on a target with some algebra of differant types, you should now see the type casts being made. Also, Tests are again back with only switches failing...
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408 |
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409 require(Tok.CloseParentheses); |
381975d76baf
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410 auto exp = P(); |
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411 return action.actOnCastExpr(Id(next), exp); |
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412 } |
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413 |
1 | 414 struct UnOp |
415 { | |
416 Tok tokenType; | |
417 int prec; | |
418 } | |
419 | |
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420 static const UnOp[] _unary = [{Tok.Minus, 4}]; |
1 | 421 UnOp* unary(Tok t) |
422 { | |
423 foreach (ref op; _unary) | |
424 if (op.tokenType == t) | |
425 return &op; | |
426 return null; | |
427 } | |
428 | |
429 struct BinOp | |
430 { | |
431 Tok tokenType; | |
432 int prec; | |
433 bool leftAssoc; | |
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434 Operator operator; |
1 | 435 } |
436 | |
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437 static const BinOp[] _binary = |
1 | 438 [ |
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439 {Tok.Assign, 1, false, Operator.Assign}, |
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440 |
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441 {Tok.Eq, 2, true, Operator.Eq}, |
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442 {Tok.Ne, 2, true, Operator.Ne}, |
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443 |
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444 {Tok.Lt, 2, true, Operator.Lt}, |
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445 {Tok.Le, 2, true, Operator.Le}, |
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446 {Tok.Gt, 2, true, Operator.Gt}, |
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447 {Tok.Ge, 2, true, Operator.Ge}, |
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448 |
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449 {Tok.Plus, 3, true, Operator.Add}, |
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450 {Tok.Minus, 3, true, Operator.Sub}, |
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451 |
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452 {Tok.Star, 5, true, Operator.Mul}, |
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453 {Tok.Slash, 5, true, Operator.Div}, |
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454 {Tok.Percent, 5, true, Operator.Mod} |
1 | 455 ]; |
456 BinOp* binary(Tok t) | |
457 { | |
458 foreach (ref op; _binary) | |
459 if (op.tokenType == t) | |
460 return &op; | |
461 return null; | |
462 } | |
463 | |
464 private: | |
465 | |
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466 Token require(Tok t) |
1 | 467 { |
468 if (lexer.peek().type != t) | |
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469 throw error(__LINE__, PE.UnexpectedTokSingle) |
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470 .arg(lexer.peek.getType) |
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471 .arg(t) |
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472 .tok(lexer.peek); |
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473 return lexer.next(); |
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474 } |
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475 |
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476 bool skip(Tok t) |
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477 { |
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478 if (lexer.peek().type != t) |
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479 return false; |
1 | 480 lexer.next(); |
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481 return true; |
1 | 482 } |
483 | |
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484 Error error(uint line, char[] errMsg) |
1 | 485 { |
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486 Location loc = lexer.peek.location; |
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487 auto e = |
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488 new Error("Parser.d(" ~ Integer.toString(line) ~ "): " ~errMsg); |
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489 e.loc(loc); |
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490 return e; |
1 | 491 } |
492 | |
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493 struct PE |
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494 { |
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495 static char[] |
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496 UnexpectedTokMulti = "Unexpected token, got %0 expected one of %1", |
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497 UnexpectedTokSingle = "Unexpected token, got %0 expected %1", |
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498 UnexpectedTok = "Unexpected token %0"; |
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499 |
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500 static char[] |
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501 CaseValueMustBeInt = "Cases can only be integer literals"; |
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502 } |
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503 |
1 | 504 Lexer lexer; |
505 } |