Mercurial > projects > dang
annotate lexer/Token.d @ 62:78a6808b2e0f new_gen
Added support for "%" - modulus / reminder
| author | Anders Johnsen <skabet@gmail.com> |
|---|---|
| date | Tue, 29 Apr 2008 16:34:11 +0200 |
| parents | b6c1dc30ca4b |
| children | 381975d76baf |
| rev | line source |
|---|---|
| 1 | 1 module lexer.Token; |
| 2 | |
| 3 public | |
| 4 import misc.Location; | |
| 5 | |
| 6 import Integer = tango.text.convert.Integer; | |
| 7 | |
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8 /** |
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9 The Token struct will be used through the Lexer, Parser and other |
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10 modules as a location into source. |
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11 |
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12 The Token should always be optimized for size to limit unnecessary |
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13 memory usage. |
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14 */ |
| 1 | 15 struct Token |
| 16 { | |
| 17 Tok type; | |
| 18 Location location; | |
| 19 uint length; | |
| 20 | |
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21 /** |
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22 Create a new token with a Tok type, Location in source and a |
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23 length of how many chars the Token span in the source |
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24 */ |
| 1 | 25 static Token opCall (Tok type, Location location, uint length) |
| 26 { | |
| 27 Token t; | |
| 28 t.type = type; | |
| 29 t.location = location; | |
| 30 t.length = length; | |
| 31 return t; | |
| 32 } | |
| 33 | |
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34 /** |
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35 Get the type of the Token as a string |
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36 */ |
| 1 | 37 char[] getType () |
| 38 { | |
| 39 return typeToString[this.type]; | |
| 40 } | |
| 41 | |
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42 /** |
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43 A human readable dump of a Token |
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44 */ |
| 1 | 45 char[] toString () |
| 46 { | |
| 47 return this.getType()~": Len: "~Integer.toString(this.length) | |
| 48 ~", Loc: "~location.toString; | |
| 49 } | |
| 50 | |
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51 /** |
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52 Get the string in the source that matches what this Token is |
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53 covering. |
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54 */ |
| 1 | 55 char[] get () |
| 56 { | |
| 57 return location.get(length); | |
| 58 } | |
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59 |
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60 /** |
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61 Returns true if the type of this token is a basic type (int, float, ...). |
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62 Void is included, although a void in it self is not really a type. |
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63 */ |
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64 bool isBasicType() |
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65 { |
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66 return type >= Tok.Byte && type <= Tok.Void; |
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67 } |
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68 |
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69 /** |
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70 Returns true for all the various assignments (=, +=, *= ...) |
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71 */ |
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72 bool isAssignment() |
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73 { |
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74 return type == Tok.Assign; |
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75 } |
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76 |
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77 /** |
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78 Just a shortcut to avoid `token.type == Tok.Identifier`. |
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79 */ |
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80 bool isIdentifier() |
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81 { |
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82 return type == Tok.Identifier; |
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83 } |
| 1 | 84 } |
| 85 | |
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86 /** |
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87 Tok is short for TokenType. This enum list is to supply the Token |
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88 with a type. |
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89 |
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90 This enum is used to switch over "many" places. |
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91 */ |
| 1 | 92 enum Tok : ushort |
| 93 { | |
| 94 /* Non-code related tokens */ | |
| 95 EOF, | |
| 96 | |
| 97 /* Basic types */ | |
| 98 Identifier, | |
| 99 Integer, | |
| 100 | |
| 101 /* Basic operators */ | |
| 102 Assign, | |
| 103 Add, Sub, | |
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104 Mul, Div, Mod, |
| 1 | 105 Comma, |
| 106 | |
| 107 /* Symbols */ | |
| 108 OpenParentheses, | |
| 109 CloseParentheses, | |
| 110 OpenBrace, | |
| 111 CloseBrace, | |
| 112 Seperator, | |
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113 Colon, |
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114 Dot, |
| 1 | 115 |
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116 /* Comparator operators */ |
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117 Eq, Ne, |
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118 Lt, Gt, |
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119 Le, Ge, |
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120 |
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121 Not, |
| 6 | 122 |
| 1 | 123 /* Keywords */ |
| 124 Byte, Ubyte, | |
| 125 Short, Ushort, | |
| 126 Int, Uint, | |
| 127 Long, Ulong, | |
| 128 | |
| 129 Float, Double, | |
| 130 | |
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131 Bool, |
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132 |
| 37 | 133 Void, |
| 134 | |
| 22 | 135 Struct, |
| 136 | |
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137 If, Else, |
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138 While, |
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139 Switch, Case, Default, |
| 1 | 140 Return, |
| 141 | |
| 142 } | |
| 143 | |
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144 /** |
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145 An associative array to supply a Tok to String function. |
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146 |
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147 Keep always this list updated when adding a new Tok. |
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148 */ |
| 1 | 149 public char[][Tok] typeToString; |
| 150 | |
| 151 static this() | |
| 152 { | |
| 153 typeToString = | |
| 154 [ | |
| 155 Tok.EOF:"EOF"[], | |
| 156 Tok.Identifier:"Identifier", | |
| 157 Tok.Byte:"Byte", | |
| 158 Tok.Short:"Short", | |
| 159 Tok.Int:"Int", | |
| 160 Tok.Long:"Long", | |
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161 Tok.Bool:"Bool", |
| 37 | 162 Tok.Void:"Void", |
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163 Tok.Eq:"Eq", |
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164 Tok.Ne:"Ne", |
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165 Tok.Lt:"Lt", |
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166 Tok.Le:"Le", |
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167 Tok.Gt:"Gt", |
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168 Tok.Ge:"Ge", |
| 1 | 169 Tok.OpenParentheses:"OpenParentheses", |
| 170 Tok.CloseParentheses:"CloseParentheses", | |
| 171 Tok.OpenBrace:"OpenBrace", | |
| 172 Tok.CloseBrace:"CloseBrace", | |
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173 Tok.Dot:"Dot", |
| 1 | 174 Tok.Assign:"Assign", |
| 175 Tok.Add:"Add", | |
| 176 Tok.Sub:"Sub", | |
| 177 Tok.Mul:"Mul", | |
| 178 Tok.Div:"Div", | |
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179 Tok.Mod:"Mod", |
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180 Tok.Integer:"Integer", |
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181 Tok.If:"If", |
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182 Tok.While:"While", |
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183 Tok.Switch:"Switch", |
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184 Tok.Case:"Case", |
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185 Tok.Default:"Default", |
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186 Tok.Comma:"Comma", |
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187 Tok.Return:"Return", |
| 22 | 188 Tok.Struct:"Struct", |
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189 Tok.Colon:"Colon", |
| 1 | 190 Tok.Seperator:"Seperator" |
| 191 ]; | |
| 192 } |