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annotate parser/Action.d @ 99:857f0d530789 new_gen

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Imports and improved module statement Allow "module a.b.c" Supports most forms of D's import. import A, B; import A, B = C; import A, B : a = b, c;
author Anders Halager <halager@gmail.com>
date Tue, 06 May 2008 21:59:22 +0200
parents 48bb2287c035
children cd066f3b539a
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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
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5 import misc.Error;
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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
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15 Eq, Ne,
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17 Lt, Le,
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18 Gt, Ge,
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19
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20 Add, Sub,
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21 Mul, Div, Mod,
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22 }
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24
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25 class Id
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26 {
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27 public static Id opCall(Token tok)
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28 {
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29 auto id = new Id();
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30 id.tok = tok;
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31 return id;
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32 }
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33 Token tok;
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34 }
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35
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36 class PointerId : Id
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37 {
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38 public static PointerId opCall(Id id)
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39 {
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40 auto p = new PointerId();
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41 p.id = id;
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42 return p;
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43 }
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45 Id id;
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46 }
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47
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48 class ArrayId : Id
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49 {
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50 public static ArrayId opCall(Id id, Object number)
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51 {
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52 auto a = new ArrayId();
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53 a.id = id;
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54 a.number = number;
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55 return a;
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56 }
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57
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58 Id id;
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59 Object number;
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60 }
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61
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62 /**
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63 Represents a fully qualified name, with some packages and a final identifier.
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64 The identifier should always be set, but packages may have length 0.
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65 **/
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66 struct ModuleName
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67 {
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68 Id id;
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69 Id[] packages;
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70
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71 /// Get the full ranged spanned by packages and identifier
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72 SourceRange asRange()
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73 {
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74 SourceRange r = id.tok.asRange();
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75 foreach (identifier; packages)
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76 r = r + identifier.tok.asRange();
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77 return r;
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78 }
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79 }
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80
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81 /**
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82 All methods are optional.
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83
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84 Warning: Interface is not stable yet. Use the `override` keyword in all classes
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85 inheriting from this to get warning if the interface changes.
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86 */
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87 abstract class Action
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88 {
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89 /**
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90 A few aliases to indicate what methods should be dealing with the same
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91 types.
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92
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93 Not typesafe, and not using typedef because users would need a lot of
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94 casts (and base type would be void*, so no possibility to synchronize,
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95 print etc.)
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96 */
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97 alias Object ExprT;
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98 alias Object StmtT; /// ditto
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99 alias Object DeclT; /// ditto
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100 alias Object ModuleT; /// ditto
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101
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102 // -- Modules --
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103
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104 ModuleT actOnModule(ref Token _module, char[] name)
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105 {
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106 return null;
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107 }
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108
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109 /**
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110 This action is called when a file does not start with a module
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111 declaration - in which case there is no Token available.
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112
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113 Instead a SLoc to the start of the file is given.
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114 */
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115 ModuleT actOnImplicitModule(SourceLocation fileStart, char[] name)
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116 {
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117 return null;
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118 }
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119
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120 void actOnModuleDecl(ModuleT m, DeclT d)
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121 {
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122 }
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123
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124 // -- Declarations --
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125
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126 /**
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127 Called for an import statement, that may be renamed. Id name is null,
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128 there is no rename.
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129
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130 If there are selective imports, its handled in add
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131 */
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132 DeclT actOnImport(ref Token _import, ref ModuleName target, Id* name)
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133 {
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134 return null;
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135 }
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136
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137 /**
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138 */
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139 void addSelectiveImport(DeclT _import, ref Id target, Id* name)
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140 {
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141 }
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142
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143 /**
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144 Either we should have one case that handles a lot of things, or we should
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145 have a lot of separate cases.
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146 As an example, this method could handle the params in `int f(int, int)`
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147 as well as handling `int x` at both top-level, in classes and in methods.
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148
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149 The other solution is an addParamToFunc or similar.
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150 */
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151 DeclT actOnDeclarator(ref Id type, ref Id name, ExprT init)
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152 {
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153 return null;
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154 }
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155
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156 /**
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157 Add a struct member to a struct.
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158 */
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159 void actOnStructMember(DeclT decl, ref Id type, ref Id name, ExprT init)
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160 {
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161 return null;
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162 }
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163
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164 /**
44
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165 Add an initialization expression to a previously created decl.
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166
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167 Used for default values on function params and for values to local
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168 variables.
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169 */
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170 void addInitToDeclarator(DeclT decl, ExprT exp)
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171 {
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172 }
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173
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174 /**
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175 Called at the start of a function, doesn't get a lot of info - that is
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176 added later on, through addFuncArg and actOnEndOfFunction.
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177 */
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178 DeclT actOnStartOfFunctionDef(ref Id type, ref Id name)
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179 {
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180 return null;
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181 }
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182
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183 /**
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184 Add a new parameter to the function func.
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185 */
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186 void addFuncArg(DeclT func, Id type, Id name)
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187 {
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188 }
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189
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190 /**
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191 Finish off the function, by giving it the body (a single statement, so
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192 you probably want some sort of compound statement)
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193 */
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194 DeclT actOnEndOfFunction(DeclT func, StmtT stmts)
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195 {
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196 return func;
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197 }
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198
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199 // -- Statements --
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200
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201 /**
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202 Called after parsing a function/while/for/whatever body.
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203
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204 Note that stmts is to be considered temporary, it might point into the
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205 stack and needs to be copied before saving.
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206 */
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207 StmtT actOnCompoundStmt(ref Token left, ref Token right, StmtT[] stmts)
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208 {
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209 return null;
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210 }
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211
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212 /**
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213 An expression was used as a statement - this includes assignments,
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214 function calls.
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215
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216 Additionally the D spec dictates that expressions with no effect are not
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217 legal as statements, but the parser can't test for this so it has to be
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218 done in the later stages.
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219 */
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220 StmtT actOnExprStmt(ExprT exp)
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221 {
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222 return null;
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223 }
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224
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225 /**
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226 Called after parsing return statements.
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227
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228 loc is the return token.
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229 */
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230 StmtT actOnReturnStmt(ref Token loc, ExprT exp)
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231 {
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232 return null;
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233 }
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234
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235 /**
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236 */
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237 StmtT actOnIfStmt(ref Token ifTok, ExprT cond, StmtT thenBody,
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238 ref Token elseTok, StmtT elseBody)
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239 {
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240 return null;
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241 }
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242
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243 /**
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244 */
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245 StmtT actOnWhileStmt(ref Token whileTok, ExprT cond, StmtT whileBody)
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246 {
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247 return null;
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248 }
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249
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250 /**
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251 */
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252 StmtT actOnDeclStmt(DeclT decl)
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253 {
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254 return null;
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255 }
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256
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257 StmtT actOnStartOfSwitchStmt()
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258 {
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259 return null;
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260 }
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261
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262 void actOnCaseStmt()
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263 {
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264 }
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265
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266 void actOnDefaultStmt()
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267 {
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268 }
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269
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270 StmtT actOnFinishSwitchStmt(StmtT sw)
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271 {
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272 return sw;
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273 }
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274
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275 // -- Expressions --
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276
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277 /**
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278 A single numerical constant -- this can be absolutely any kind of number.
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279 Integers, floats, hex, octal, binary, imaginary and so on.
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280 */
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281 ExprT actOnNumericConstant(Token op)
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282 {
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283 return null;
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284 }
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285
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286 /**
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287 This is called when identifiers are used in expressions.
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288 */
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289 ExprT actOnIdentifierExp(Id id)
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290 {
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291 return null;
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292 }
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293
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294 /**
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295 Unary operator.
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296 */
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297 ExprT actOnUnaryOp(Token op, ExprT operand)
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298 {
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299 return null;
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300 }
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301
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302 /**
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303 Binary operator.
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304 */
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305 ExprT actOnBinaryOp(SLoc op_loc, Operator op, ExprT l, ExprT r)
44
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306 {
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307 return null;
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308 }
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309
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310 /**
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311 Called when using the 'dot' operator.
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312 The left hand side can be any expression, but its only possible to look
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313 up an identifier.
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314 */
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315 ExprT actOnMemberReference(ExprT lhs, SourceLocation op, Id member)
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316 {
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317 return null;
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318 }
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319
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320 /**
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321 Called when function calls are encountered.
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322
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323 Note that args is temporary and might point into the stack. Remember to
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324 copy before saving a reference to it.
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325 */
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326 ExprT actOnCallExpr(ExprT func, ref Token left_paren, ExprT[] args,
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327 ref Token right_paren)
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328 {
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329 return null;
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330 }
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331
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332 /**
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333 Called when function calls are encountered.
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334 */
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335 ExprT actOnIndexEpr(ExprT array, ref Token left_bracket, ExprT index,
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336 ref Token right_bracket)
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337 {
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338 return null;
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339 }
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340
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341 /**
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342 Cast expression.
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343 */
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344 ExprT actOnCastExpr(ref Token _cast, Id type, ExprT exp)
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345 {
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346 return null;
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347 }
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348 }
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349
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350 /**
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351 Doesn't do anything at all - can be used for benchmarking the parser.
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352 */
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353 class NullAction : Action
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354 {
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355 }
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356