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1 module ast.Exp;
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2
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3 import tango.text.Util : jhash;
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4
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5 import lexer.Token;
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6
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7 import sema.SymbolTable;
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8
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9 enum ExpType
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10 {
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11 Binary,
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12 Negate,
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13 IntegerLit,
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14 Identifier,
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15 AssignExp,
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16 CallExp,
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17 }
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18
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19 class Exp
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20 {
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21 this(ExpType expType)
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22 {
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23 this.expType = expType;
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24 }
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25
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26 ExpType expType;
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27 Scope env;
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28 }
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29
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30 class CallExp : Exp
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31 {
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32 this(Exp exp, Exp[] args)
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33 {
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34 super(ExpType.CallExp);
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35 this.exp = exp;
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36 this.args = args;
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37 }
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38
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39 Exp exp;
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40 Exp[] args;
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41 }
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42
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43 class AssignExp : Exp
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44 {
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45 this(Identifier identifier, Exp exp)
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46 {
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47 super(ExpType.AssignExp);
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48 this.identifier = identifier;
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49 this.exp = exp;
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50 }
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51
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52 Identifier identifier;
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53 Exp exp;
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54 }
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55
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56 class BinaryExp : Exp
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57 {
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58 public enum Operator : char
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59 {
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60 Mul = '*', Div = '/',
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61 Add = '+', Sub = '-'
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62 }
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63
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64 this(Operator op, Exp left, Exp right)
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65 {
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66 super(ExpType.Binary);
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67 this.op = op;
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68 this.left = left;
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69 this.right = right;
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70 }
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71
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72 Operator op;
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73 Exp left, right;
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74 }
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75
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76 class NegateExp : Exp
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77 {
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78 this(Exp exp)
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79 {
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80 super(ExpType.Negate);
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81 this.exp = exp;
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82 }
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83
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84 public Exp exp;
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85 }
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86
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87 class IntegerLit : Exp
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88 {
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89 this(Token t)
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90 {
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91 super(ExpType.IntegerLit);
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92 this.token = t;
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93 }
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94
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95 Token token;
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96 }
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97
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98 class Identifier : Exp
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99 {
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100 this(Token t)
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101 {
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102 super(ExpType.Identifier);
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103 this.token = t;
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104 name = t.get;
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105 }
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106
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107 char[] get()
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108 {
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109 return name;
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110 }
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111
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112 hash_t toHash()
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113 {
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114 return jhash(name);
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115 }
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116
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117 int opCmp(Object o)
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118 {
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119 if (auto id = cast(Identifier)o)
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120 return typeid(char[]).compare(&name, &id.name);
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121 return 0;
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122 }
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123
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124 int opEquals(Object o)
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125 {
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126 if (auto id = cast(Identifier)o)
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127 return typeid(char[]).equals(&name, &id.name);
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128 return 0;
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129 }
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130
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131 Token token;
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132 char[] name;
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133 }
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134
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135
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