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annotate ast/Expr.d @ 205:8387cbaa85ab

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Small addition to the comments of an assign expr.
author Anders Johnsen <skabet@gmail.com>
date Mon, 11 Aug 2008 21:56:21 +0200
parents 227d6a8fb574
children
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201
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1 module ast.Expr;
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2
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3 /**
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4 The base class for all Expressions.
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5 */
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6 class Expr
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7 {
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8 /// Get the type of the Expr
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9 Object getType()
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10 {
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11 assert(0, "Unimplemented");
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12 return null;
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13 }
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14
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15 /// Set the type of the Expr
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16 void setType(Object type)
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17 {
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18 assert(0, "Unimplemented");
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19 }
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20
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21 /// Returns true if the Expr can be compile-time evaluated.
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22 bool isConstantExpr() { return false; }
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23
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24 NumberLiteral asNumberLiteral() { return null; }
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25 bool isNumberLiteral() { return false; }
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26
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27 StringLiteral asStringLiteral() { return null; }
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28 bool isStringLiteral() { return false; }
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29
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30 ArrayLiteral asArrayLiteral() { return null; }
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31 bool isArrayLiteral() { return false; }
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32
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33 Assign asAssign() { return null; }
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34 bool isAssign() { return false; }
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35
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36 Binary asBinary() { return null; }
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37 bool isBinary() { return false; }
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38
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39 Negate asNegate() { return null; }
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40 bool isNegate() { return false; }
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41
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42 Deref asDeref() { return null; }
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43 bool isDeref() { return false; }
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44
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45 AddressOf asAddressOf() { return null; }
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46 bool isAddressOf() { return false; }
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47
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48 Index asIndex() { return null; }
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49 bool isIndex() { return false; }
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50
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51 Identifier asIdentifier() { return null; }
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52 bool isIdentifier() { return false; }
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53
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54 Member asMember() { return null; }
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55 bool isMember() { return false; }
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56
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57 private:
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58 /// FIXME: Add DType? here
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59 }
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60
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61 /**
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62 NumberLiteral
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63 */
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64 /// FIXME: Should there be an IntegerLiteral and FloatLiteral instead?
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65 class NumberLiteral : Expr
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66 {
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67 override bool isConstantExpr() { return true; }
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68
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69 override NumberLiteral asNumberLiteral() { return this; }
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70 override bool isNumberLiteral() { return true; }
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71 }
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72
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73 /**
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74 StringLiteral
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75 */
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76 class StringLiteral : Expr
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77 {
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78 override bool isConstantExpr() { return true; }
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79
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80 override StringLiteral asStringLiteral() { return this; }
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81 override bool isStringLiteral() { return true; }
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82 }
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83
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84 /**
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85 ArrayLiteral
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86 */
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87 class ArrayLiteral : Expr
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88 {
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89 /// Return the arguments for the ArrayLiteral
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90 Expr[] getArguments() { return arguments; }
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91
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92 /// Return a given argument for the ArrayLiteral
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93 Expr getArgument(int index) { return arguments[index]; }
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94
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95 /// Get the count of arguments for the ArrayLiteral
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96 int getArgumentCount() { return arguments.length; }
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97
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98 override bool isConstantExpr()
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99 {
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100 /**
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101 If all the arguments to the ArrayLiteral is an constant Expr, then
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102 this ArrayLiteral can be considered an constant Expr aswell.
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103 */
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104 // FIXME: consider if it should save the result
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105 foreach (arg; arguments)
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106 if (!arg.isConstantExpr())
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107 return false;
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108 return true;
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109 }
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110
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111 override ArrayLiteral asArrayLiteral() { return this; }
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112 override bool isArrayLiteral() { return true; }
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113
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114 private:
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115 Expr[] arguments;
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116 }
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117
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118 /**
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119 The Assign expression contains two expression, a left and a right side,
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120 left being a lvalue, right being a rvalue.
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121
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122 If the right side ain't the same type as the left type, the right side will
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123 try to be promoted through an implicit cast. If this failes, an error must
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124 be given.
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125 */
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126 class Assign : Expr
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127 {
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128 override Assign asAssign() { return this; }
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129 override bool isAssign() { return true; }
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130
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131 private:
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132 Expr left, right;
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133 }
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134
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135 /**
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136 Binary
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137 */
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138 class Binary : Expr
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139 {
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140 override Binary asBinary() { return this; }
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141 override bool isBinary() { return true; }
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142
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143 private:
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144 Expr left, right;
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145 }
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146
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147 /**
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148 Negate
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149 */
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150 class Negate : Expr
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151 {
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152 override Negate asNegate() { return this; }
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153 override bool isNegate() { return true; }
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154
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155 private:
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156 Expr expr;
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157 }
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158
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159 /**
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160 Deref
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161 */
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162 class Deref : Expr
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163 {
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164 override Deref asDeref() { return this; }
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165 override bool isDeref() { return true; }
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166 }
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167
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168 /**
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169 AddressOf
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170 */
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171 class AddressOf : Expr
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172 {
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173 override AddressOf asAddressOf() { return this; }
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174 override bool isAddressOf() { return true; }
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175 }
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176
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177 /**
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178 Index
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179 */
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180 class Index : Expr
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181 {
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182 override Index asIndex() { return this; }
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183 override bool isIndex() { return true; }
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184 }
201
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185
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186 /**
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187 Identifier
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188 */
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189 class Identifier : Expr
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190 {
204
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191 override Identifier asIdentifier() { return this; }
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192 override bool isIdentifier() { return true; }
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193 }
201
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194
204
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195 /**
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196 Member
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197 */
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198 class Member : Expr
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199 {
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200 override Member asMember() { return this; }
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201 override bool isMember() { return true; }
201
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202 }
204
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203