Mercurial > projects > dang
annotate lexer/Token.d @ 74:192da4976daa new_gen
Renamed Add, Sub, Mul, Div and Mod in lexer to what they are (Plus, Minus....)
author | johnsen@johnsen-laptop |
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date | Fri, 02 May 2008 13:19:23 +0200 |
parents | 628cb46ab13b |
children | eb5b2c719a39 |
rev | line source |
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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 | |
42
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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 | |
42
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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, | |
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103 Plus, Minus, |
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104 Star, Slash, Percent, |
1 | 105 Comma, |
106 | |
107 /* Symbols */ | |
108 OpenParentheses, | |
109 CloseParentheses, | |
110 OpenBrace, | |
111 CloseBrace, | |
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112 OpenBracket, |
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113 CloseBracket, |
1 | 114 Seperator, |
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115 Colon, |
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116 Dot, |
1 | 117 |
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118 /* Comparator operators */ |
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119 Eq, Ne, |
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120 Lt, Gt, |
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121 Le, Ge, |
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122 |
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123 Not, |
6 | 124 |
1 | 125 /* Keywords */ |
126 Byte, Ubyte, | |
127 Short, Ushort, | |
128 Int, Uint, | |
129 Long, Ulong, | |
130 | |
131 Float, Double, | |
132 | |
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133 Bool, |
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134 |
37 | 135 Void, |
136 | |
22 | 137 Struct, |
138 | |
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139 If, Else, |
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140 While, |
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141 Switch, Case, Default, |
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142 Return, Cast, |
1 | 143 |
144 } | |
145 | |
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146 /** |
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147 An associative array to supply a Tok to String function. |
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148 |
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149 Keep always this list updated when adding a new Tok. |
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150 */ |
1 | 151 public char[][Tok] typeToString; |
152 | |
153 static this() | |
154 { | |
155 typeToString = | |
156 [ | |
157 Tok.EOF:"EOF"[], | |
158 Tok.Identifier:"Identifier", | |
159 Tok.Byte:"Byte", | |
160 Tok.Short:"Short", | |
161 Tok.Int:"Int", | |
162 Tok.Long:"Long", | |
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163 Tok.Bool:"Bool", |
37 | 164 Tok.Void:"Void", |
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165 Tok.Eq:"Eq", |
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166 Tok.Ne:"Ne", |
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167 Tok.Lt:"Lt", |
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168 Tok.Le:"Le", |
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169 Tok.Gt:"Gt", |
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170 Tok.Ge:"Ge", |
1 | 171 Tok.OpenParentheses:"OpenParentheses", |
172 Tok.CloseParentheses:"CloseParentheses", | |
173 Tok.OpenBrace:"OpenBrace", | |
174 Tok.CloseBrace:"CloseBrace", | |
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175 Tok.OpenBracket:"OpenBracket", |
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176 Tok.CloseBracket:"CloseBracket", |
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177 Tok.Dot:"Dot", |
1 | 178 Tok.Assign:"Assign", |
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179 Tok.Plus:"Plus", |
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180 Tok.Minus:"Minus", |
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181 Tok.Star:"Star", |
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182 Tok.Slash:"Slash", |
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183 Tok.Percent:"Percent", |
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184 Tok.Integer:"Integer", |
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185 Tok.If:"If", |
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186 Tok.While:"While", |
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187 Tok.Switch:"Switch", |
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188 Tok.Case:"Case", |
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189 Tok.Default:"Default", |
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190 Tok.Comma:"Comma", |
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191 Tok.Return:"Return", |
22 | 192 Tok.Struct:"Struct", |
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193 Tok.Colon:"Colon", |
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194 Tok.Seperator:"Seperator", |
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195 Tok.Cast:"Cast" |
1 | 196 ]; |
197 } |