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annotate parser/Action.d @ 75:86aec2160221 new_gen

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Parsing "int* x"
author Anders Johnsen <skabet@gmail.com>
date Fri, 02 May 2008 15:05:02 +0200
parents 381975d76baf
children 110c7e1c4ca2
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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 char[] toString()
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36 {
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37 return tok.get;
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38 }
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39 }
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41 class PointerId : Id
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42 {
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43 public static PointerId opCall(Id id)
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44 {
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45 auto p = new PointerId();
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46 p.id = id;
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47 return p;
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48 }
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49
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50 Id id;
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51 }
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52
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53 /**
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54 All methods are optional.
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55
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56 Warning: Interface is not stable yet. Use the `override` keyword in all classes
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57 inheriting from this to get warning if the interface changes.
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58 */
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59 abstract class Action
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60 {
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61 /**
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62 A few aliases to indicate what methods should be dealing with the same
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63 types.
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64
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65 Not typesafe, and not using typedef because users would need a lot of
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66 casts (and base type would be void*, so no possibility to synchronize,
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67 print etc.)
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68 */
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69 alias Object ExprT;
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70 alias Object StmtT; /// ditto
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71 alias Object DeclT; /// ditto
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72
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73 // -- Declarations --
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74
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75 /**
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76 Either we should have one case that handles a lot of things, or we should
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77 have a lot of separate cases.
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78 As an example, this method could handle the params in `int f(int, int)`
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79 as well as handling `int x` at both top-level, in classes and in methods.
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80
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81 The other solution is an addParamToFunc or similar.
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82 */
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83 DeclT actOnDeclarator(ref Id type, ref Id name, ExprT init)
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84 {
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85 return null;
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86 }
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87
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88 /**
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89 Add a struct member to a struct.
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90 */
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91 void actOnStructMember(DeclT decl, ref Id type, ref Id name, ExprT init)
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92 {
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93 return null;
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94 }
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96 /**
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97 Add an initialization expression to a previously created decl.
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98
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99 Used for default values on function params and for values to local
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100 variables.
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101 */
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102 void addInitToDeclarator(DeclT decl, ExprT exp)
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103 {
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104 }
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105
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106 /**
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107 Called at the start of a function, doesn't get a lot of info - that is
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108 added later on, through addFuncArg and actOnEndOfFunction.
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109 */
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110 DeclT actOnStartOfFunctionDef(ref Id type, ref Id name)
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111 {
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112 return null;
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113 }
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114
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115 /**
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116 Add a new parameter to the function func.
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117 */
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118 void addFuncArg(DeclT func, Id type, Id name)
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119 {
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120 }
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121
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122 /**
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123 Finish off the function, by giving it the body (a single statement, so
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124 you probably want some sort of compound statement)
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125 */
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126 DeclT actOnEndOfFunction(DeclT func, StmtT stmts)
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127 {
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128 return func;
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129 }
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130
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131 // -- Statements --
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132
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133 /**
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134 Called after parsing a function/while/for/whatever body.
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135
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136 Note that stmts is to be considered temporary, it might point into the
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137 stack and needs to be copied before saving.
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138 */
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139 StmtT actOnCompoundStmt(ref Token left, ref Token right, StmtT[] stmts)
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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 An expression was used as a statement - this includes assignments,
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146 function calls.
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147
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148 Additionally the D spec dictates that expressions with no effect are not
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149 legal as statements, but the parser can't test for this so it has to be
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150 done in the later stages.
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151 */
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152 StmtT actOnExprStmt(ExprT exp)
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153 {
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154 return null;
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155 }
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156
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157 /**
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158 Called after parsing return statements.
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159
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160 loc is the return token.
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161 */
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162 StmtT actOnReturnStmt(ref Token loc, ExprT exp)
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163 {
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164 return null;
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165 }
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166
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167 /**
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168 */
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169 StmtT actOnIfStmt(ref Token ifTok, ExprT cond, StmtT thenBody,
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170 ref Token elseTok, StmtT elseBody)
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171 {
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172 return null;
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173 }
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174
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175 /**
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176 */
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177 StmtT actOnWhileStmt(ref Token whileTok, ExprT cond, StmtT whileBody)
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178 {
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179 return null;
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180 }
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181
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182 /**
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183 */
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184 StmtT actOnDeclStmt(DeclT decl)
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185 {
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186 return null;
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187 }
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188
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189 StmtT actOnStartOfSwitchStmt()
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190 {
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191 return null;
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192 }
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193
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194 void actOnCaseStmt()
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195 {
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196 }
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197
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198 void actOnDefaultStmt()
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199 {
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200 }
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201
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202 StmtT actOnFinishSwitchStmt(StmtT sw)
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203 {
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204 return sw;
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205 }
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206
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207 // -- Expressions --
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208
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209 /**
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210 A single numerical constant -- this can be absolutely any kind of number.
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211 Integers, floats, hex, octal, binary, imaginary and so on.
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212 */
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213 ExprT actOnNumericConstant(Token op)
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214 {
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215 return null;
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216 }
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217
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218 /**
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219 This is called when identifiers are used in expressions.
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220 */
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221 ExprT actOnIdentifierExp(Id id)
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222 {
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223 return null;
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224 }
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225
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226 /**
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227 Unary operator.
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228 */
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229 ExprT actOnUnaryOp(Token op, ExprT operand)
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230 {
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231 return null;
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232 }
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233
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234 /**
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235 Binary operator.
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236 */
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237 ExprT actOnBinaryOp(Operator op, ExprT l, ExprT r)
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238 {
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239 return null;
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240 }
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241
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242 /**
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243 Called when using the 'dot' operator.
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244 The left hand side can be any expression, but its only possible to look
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245 up an identifier.
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246 */
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247 ExprT actOnMemberReference(ExprT lhs, Location op, Id member)
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248 {
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249 return null;
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250 }
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251
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252 /**
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253 Called when function calls are encountered.
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254
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255 Note that args is temporary and might point into the stack. Remember to
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256 copy before saving a reference to it.
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257 */
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258 ExprT actOnCallExpr(ExprT func, ref Token left_paren, ExprT[] args,
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259 ref Token right_paren)
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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 /**
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265 Cast expression.
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266 */
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267 ExprT actOnCastExpr(Id type, ExprT exp)
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268 {
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269 return null;
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270 }
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271 }
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272
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273 /**
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274 Doesn't do anything at all - can be used for benchmarking the parser.
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275 */
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276 class NullAction : Action
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277 {
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278 }
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279