Mercurial > projects > dang
annotate parser/Action.d @ 126:c3b24e7e8cf8
Carius changes to the parser. Parsing attributes, lexing many keywords(not all yet).
author | Anders Johnsen <skabet@gmail.com> |
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date | Tue, 27 May 2008 10:32:31 +0200 |
parents | 6a5f745d351c |
children | 2be29b296081 |
rev | line source |
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1 module parser.Action; |
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2 |
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3 import lexer.Token; |
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4 |
126
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5 import basic.Attribute; |
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6 |
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7 /** |
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8 Used to indicate what type of operator is used in a given binary expression |
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9 (and unary expressions?) |
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10 */ |
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11 public enum Operator |
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12 { |
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13 Assign, |
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14 AddAssign, |
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15 SubAssign, |
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16 MulAssign, |
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17 DivAssign, |
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18 ModAssign, |
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19 |
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20 Eq, Ne, |
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21 |
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22 Lt, Le, |
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23 Gt, Ge, |
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24 |
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25 Add, Sub, |
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26 Mul, Div, Mod, |
123 | 27 |
28 LeftShift, RightShift, UnsignedRightShift, | |
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29 } |
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30 |
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31 |
75 | 32 class Id |
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33 { |
75 | 34 public static Id opCall(Token tok) |
35 { | |
36 auto id = new Id(); | |
37 id.tok = tok; | |
38 return id; | |
39 } | |
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40 Token tok; |
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41 } |
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42 |
75 | 43 class PointerId : Id |
44 { | |
45 public static PointerId opCall(Id id) | |
46 { | |
47 auto p = new PointerId(); | |
48 p.id = id; | |
49 return p; | |
50 } | |
51 | |
52 Id id; | |
53 } | |
54 | |
81 | 55 class ArrayId : Id |
56 { | |
57 public static ArrayId opCall(Id id, Object number) | |
58 { | |
59 auto a = new ArrayId(); | |
60 a.id = id; | |
61 a.number = number; | |
62 return a; | |
63 } | |
64 | |
65 Id id; | |
66 Object number; | |
67 } | |
68 | |
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69 /** |
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70 Represents a fully qualified name, with some packages and a final identifier. |
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71 The identifier should always be set, but packages may have length 0. |
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72 **/ |
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73 struct ModuleName |
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74 { |
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75 Id id; |
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76 Id[] packages; |
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77 |
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78 /// Get the full ranged spanned by packages and identifier |
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79 SourceRange asRange() |
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80 { |
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81 SourceRange r = id.tok.asRange(); |
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82 foreach (identifier; packages) |
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83 r = r + identifier.tok.asRange(); |
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84 return r; |
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85 } |
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86 } |
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87 |
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88 /** |
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89 All methods are optional. |
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90 |
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91 Warning: Interface is not stable yet. Use the `override` keyword in all classes |
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92 inheriting from this to get warning if the interface changes. |
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93 */ |
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94 abstract class Action |
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95 { |
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96 /** |
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97 A few aliases to indicate what methods should be dealing with the same |
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98 types. |
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99 |
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100 Not typesafe, and not using typedef because users would need a lot of |
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101 casts (and base type would be void*, so no possibility to synchronize, |
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102 print etc.) |
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103 */ |
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104 alias Object ExprT; |
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105 alias Object StmtT; /// ditto |
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106 alias Object DeclT; /// ditto |
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107 alias Object ModuleT; /// ditto |
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108 |
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109 // -- Modules -- |
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110 |
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111 ModuleT actOnModule(ref Token _module, char[] name) |
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112 { |
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113 return null; |
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114 } |
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115 |
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116 /** |
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117 This action is called when a file does not start with a module |
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118 declaration - in which case there is no Token available. |
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119 |
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120 Instead a SLoc to the start of the file is given. |
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121 */ |
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122 ModuleT actOnImplicitModule(SourceLocation fileStart, char[] name) |
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123 { |
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124 return null; |
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125 } |
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126 |
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127 void actOnModuleDecl(ModuleT m, DeclT d) |
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128 { |
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129 } |
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130 |
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131 // -- Declarations -- |
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132 |
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133 /** |
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134 Called for an import statement, that may be renamed. Id name is null, |
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135 there is no rename. |
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136 |
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137 If there are selective imports, its handled in add |
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138 */ |
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139 DeclT actOnImport(ref Token _import, ref ModuleName target, Id* name) |
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140 { |
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141 return null; |
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142 } |
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143 |
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144 /** |
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145 */ |
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146 void addSelectiveImport(DeclT _import, ref Id target, Id* name) |
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147 { |
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148 } |
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149 |
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150 /** |
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151 Either we should have one case that handles a lot of things, or we should |
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152 have a lot of separate cases. |
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153 As an example, this method could handle the params in `int f(int, int)` |
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154 as well as handling `int x` at both top-level, in classes and in methods. |
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155 |
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156 The other solution is an addParamToFunc or similar. |
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157 */ |
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158 DeclT actOnDeclarator(ref Id type, ref Id name, ExprT init, Attribute att) |
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159 { |
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160 return null; |
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161 } |
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162 |
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163 /** |
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164 Add a struct member to a struct. |
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165 */ |
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166 void actOnStructMember(DeclT st_decl, DeclT m_decl) //ref Id type, ref Id name, ExprT init) |
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167 { |
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168 return null; |
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169 } |
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170 |
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171 /** |
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172 Add an initialization expression to a previously created decl. |
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173 |
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174 Used for default values on function params and for values to local |
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175 variables. |
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176 */ |
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177 void addInitToDeclarator(DeclT decl, ExprT exp) |
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178 { |
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179 } |
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180 |
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181 /** |
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182 Called at the start of a function, doesn't get a lot of info - that is |
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183 added later on, through addFuncArg and actOnEndOfFunction. |
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184 */ |
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185 DeclT actOnStartOfFunctionDef(ref Id type, ref Id name) |
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186 { |
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187 return null; |
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188 } |
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189 |
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190 /** |
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191 Add a new parameter to the function func. |
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192 */ |
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193 void addFuncArg(DeclT func, Id type, Id name) |
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194 { |
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195 } |
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196 |
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197 /** |
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198 Finish off the function, by giving it the body (a single statement, so |
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199 you probably want some sort of compound statement) |
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200 */ |
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201 DeclT actOnEndOfFunction(DeclT func, StmtT stmts) |
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202 { |
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203 return func; |
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204 } |
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205 |
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206 // -- Statements -- |
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207 |
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208 /** |
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209 Called after parsing a function/while/for/whatever body. |
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210 |
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211 Note that stmts is to be considered temporary, it might point into the |
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212 stack and needs to be copied before saving. |
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213 */ |
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214 StmtT actOnCompoundStmt(ref Token left, ref Token right, StmtT[] stmts) |
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215 { |
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216 return null; |
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217 } |
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218 |
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219 /** |
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220 An expression was used as a statement - this includes assignments, |
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221 function calls. |
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222 |
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223 Additionally the D spec dictates that expressions with no effect are not |
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224 legal as statements, but the parser can't test for this so it has to be |
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225 done in the later stages. |
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226 */ |
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227 StmtT actOnExprStmt(ExprT exp) |
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228 { |
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229 return null; |
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230 } |
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231 |
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232 /** |
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233 Called after parsing return statements. |
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234 |
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235 loc is the return token. |
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236 */ |
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237 StmtT actOnReturnStmt(ref Token loc, ExprT exp) |
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238 { |
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239 return null; |
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240 } |
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241 |
45 | 242 /** |
243 */ | |
244 StmtT actOnIfStmt(ref Token ifTok, ExprT cond, StmtT thenBody, | |
245 ref Token elseTok, StmtT elseBody) | |
246 { | |
247 return null; | |
248 } | |
249 | |
46 | 250 /** |
251 */ | |
252 StmtT actOnWhileStmt(ref Token whileTok, ExprT cond, StmtT whileBody) | |
253 { | |
254 return null; | |
255 } | |
256 | |
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257 /** |
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258 */ |
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259 StmtT actOnDeclStmt(DeclT decl) |
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260 { |
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261 return null; |
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262 } |
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263 |
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264 StmtT actOnStartOfSwitchStmt() |
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265 { |
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266 return null; |
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267 } |
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268 |
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269 void actOnCaseStmt() |
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270 { |
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271 } |
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272 |
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273 void actOnDefaultStmt() |
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274 { |
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275 } |
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276 |
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277 StmtT actOnFinishSwitchStmt(StmtT sw) |
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278 { |
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279 return sw; |
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280 } |
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281 |
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282 // -- Expressions -- |
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283 |
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284 /** |
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285 A single numerical constant -- this can be absolutely any kind of number. |
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286 Integers, floats, hex, octal, binary, imaginary and so on. |
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287 */ |
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288 ExprT actOnNumericConstant(Token op) |
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289 { |
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290 return null; |
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291 } |
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292 |
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293 /** |
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294 This is called when identifiers are used in expressions. |
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295 */ |
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296 ExprT actOnIdentifierExp(Id id) |
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297 { |
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298 return null; |
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299 } |
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300 |
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301 /** |
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302 This is called when strings are used in expression |
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303 */ |
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304 ExprT actOnStringExp(Token t) |
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305 { |
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306 return null; |
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307 } |
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308 |
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309 /** |
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310 Unary operator. |
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311 */ |
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312 ExprT actOnUnaryOp(Token op, ExprT operand) |
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313 { |
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314 return null; |
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315 } |
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316 |
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317 /** |
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318 Binary operator. |
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319 */ |
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320 ExprT actOnBinaryOp(SLoc op_loc, Operator op, ExprT l, ExprT r) |
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321 { |
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322 return null; |
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323 } |
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324 |
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325 /** |
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326 Called when using the 'dot' operator. |
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327 The left hand side can be any expression, but its only possible to look |
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328 up an identifier. |
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329 */ |
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330 ExprT actOnMemberReference(ExprT lhs, SourceLocation op, Id member) |
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331 { |
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332 return null; |
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333 } |
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334 |
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335 /** |
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336 Called when function calls are encountered. |
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337 |
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338 Note that args is temporary and might point into the stack. Remember to |
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339 copy before saving a reference to it. |
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340 */ |
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341 ExprT actOnCallExpr(ExprT func, ref Token left_paren, ExprT[] args, |
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342 ref Token right_paren) |
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343 { |
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344 return null; |
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345 } |
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346 |
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347 /** |
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348 Called when function calls are encountered. |
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349 */ |
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350 ExprT actOnIndexEpr(ExprT array, ref Token left_bracket, ExprT index, |
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351 ref Token right_bracket) |
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352 { |
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353 return null; |
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354 } |
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355 |
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356 /** |
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357 Cast expression. |
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358 */ |
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359 ExprT actOnCastExpr(ref Token _cast, Id type, ExprT exp) |
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360 { |
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361 return null; |
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362 } |
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363 } |
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364 |
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365 /** |
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366 Doesn't do anything at all - can be used for benchmarking the parser. |
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367 */ |
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368 class NullAction : Action |
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369 { |
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370 } |
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371 |