Mercurial > projects > dil
annotate trunk/src/dil/lexer/Token.d @ 596:39fac5531b85
Moved dil.Token to dil.lexer.Token.
author | Aziz K?ksal <aziz.koeksal@gmail.com> |
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date | Sun, 06 Jan 2008 00:25:29 +0100 |
parents | trunk/src/dil/Token.d@9e811db780a6 |
children | 4d50267f59c9 |
rev | line source |
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0 | 1 /++ |
2 Author: Aziz Köksal | |
249 | 3 License: GPL3 |
0 | 4 +/ |
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Moved dil.Token to dil.lexer.Token.
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5 module dil.lexer.Token; |
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6 |
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7 import dil.Location; |
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8 import dil.Identifier; |
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9 import dil.lexer.Funcs; |
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10 import tango.stdc.stdlib : malloc, free; |
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11 import tango.core.Exception; |
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12 import common; |
0 | 13 |
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14 public import dil.TokensEnum; |
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15 |
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16 /++ |
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17 A Token is a sequence of characters formed by the lexical analyzer. |
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18 +/ |
0 | 19 struct Token |
20 { | |
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21 enum Flags : ushort |
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22 { |
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23 None, |
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24 Whitespace = 1, /// Tokens with this flag are ignored by the Parser. |
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25 } |
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26 |
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27 TOK type; /// The type of the token. |
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28 Flags flags; /// The flags of the token. |
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29 /// Pointers to the next and previous tokens (doubly-linked list.) |
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30 Token* next, prev; |
131 | 31 |
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32 char* ws; /// Start of whitespace characters before token. Null if no WS. |
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33 char* start; /// Start of token in source text. |
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34 char* end; /// Points one past the end of token in source text. |
4 | 35 |
0 | 36 union |
37 { | |
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38 /// For newline tokens. |
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39 struct |
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40 { |
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41 char[] filePath; |
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42 uint lineNum; |
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43 uint lineNum_hline; |
323 | 44 } |
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45 /// For #line tokens. |
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46 struct |
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47 { |
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48 Token* tokLineNum; /// #line number |
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49 Token* tokLineFilespec; /// #line number filespec |
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50 } |
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51 /// For string tokens. |
323 | 52 struct |
53 { | |
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54 string str; |
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55 char pf; /// Postfix 'c', 'w', 'd' or 0 for none. |
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56 version(D2) |
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57 Token* tok_str; /// Points to the contents of a token string stored as a |
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58 /// doubly linked list. The last token is always '}' or |
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59 /// EOF in case end of source text is "q{" EOF. |
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60 } |
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61 Identifier* ident; |
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62 dchar dchar_; |
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63 long long_; |
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64 ulong ulong_; |
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65 int int_; |
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66 uint uint_; |
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67 float float_; |
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68 double double_; |
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69 real real_; |
0 | 70 } |
28 | 71 |
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72 alias srcText identifier; |
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73 |
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74 /// Returns the text of the token. |
65 | 75 string srcText() |
28 | 76 { |
30 | 77 assert(start && end); |
28 | 78 return start[0 .. end - start]; |
79 } | |
80 | |
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81 /// Returns the preceding whitespace of the token. |
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82 string wsChars() |
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83 { |
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84 assert(ws && start); |
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85 return ws[0 .. start - ws]; |
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86 } |
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87 |
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88 /// Find next non-whitespace token. Returns 'this' token if the next token is TOK.EOF or null. |
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89 Token* nextNWS() |
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90 out(token) |
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91 { |
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92 assert(token !is null); |
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93 } |
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94 body |
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95 { |
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96 auto token = next; |
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97 while (token !is null && token.isWhitespace) |
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98 token = token.next; |
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99 if (token is null || token.type == TOK.EOF) |
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100 return this; |
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101 return token; |
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102 } |
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103 |
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104 /// Find previous non-whitespace token. Returns 'this' token if the previous token is TOK.HEAD or null. |
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105 Token* prevNWS() |
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106 out(token) |
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107 { |
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108 assert(token !is null); |
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109 } |
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110 body |
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111 { |
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112 auto token = prev; |
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113 while (token !is null && token.isWhitespace) |
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114 token = token.prev; |
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115 if (token is null || token.type == TOK.HEAD) |
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116 return this; |
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117 return token; |
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118 } |
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119 |
210 | 120 static string toString(TOK tok) |
208 | 121 { |
122 return tokToString[tok]; | |
123 } | |
124 | |
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125 /// Adds Flags.Whitespace to this token's flags. |
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126 void setWhitespaceFlag() |
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127 { |
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128 this.flags |= Flags.Whitespace; |
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129 } |
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130 |
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131 /++ |
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132 Returns true if this is a token that can have newlines in it. |
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133 These can be block and nested comments and any string literal |
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134 except for escape string literals. |
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135 +/ |
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136 bool isMultiline() |
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137 { |
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138 return type == TOK.String && start[0] != '\\' || |
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139 type == TOK.Comment && start[1] != '/'; |
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140 } |
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141 |
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142 /// Returns true if this is a keyword token. |
28 | 143 bool isKeyword() |
144 { | |
163
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145 return KeywordsBegin <= type && type <= KeywordsEnd; |
28 | 146 } |
208 | 147 |
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148 /// Returns true if this is an integral type token. |
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149 bool isIntegralType() |
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150 { |
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151 return IntegralTypeBegin <= type && type <= IntegralTypeEnd; |
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152 } |
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153 |
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154 /// Returns true if this is a whitespace token. |
314
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155 bool isWhitespace() |
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156 { |
552
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157 return !!(flags & Flags.Whitespace); |
314
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158 } |
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159 |
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160 /// Returns true if this is a special token. |
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161 bool isSpecialToken() |
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162 { |
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163 return SpecialTokensBegin <= type && type <= SpecialTokensEnd; |
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164 } |
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165 |
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166 version(D2) |
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167 { |
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168 /// Returns true if this is a token string literal. |
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169 bool isTokenStringLiteral() |
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170 { |
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171 return type == TOK.String && tok_str !is null; |
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172 } |
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173 } |
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174 |
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175 /// Returns true if this token starts a DeclarationDefinition. |
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176 bool isDeclDefStart() |
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177 { |
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178 return isDeclDefStartToken(type); |
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179 } |
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180 |
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181 /// Returns true if this token starts a Statement. |
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182 bool isStatementStart() |
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183 { |
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184 return isStatementStartToken(type); |
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185 } |
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186 |
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187 /// Returns true if this token starts an AsmInstruction. |
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188 bool isAsmInstructionStart() |
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189 { |
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190 return isAsmInstructionStartToken(type); |
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191 } |
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192 |
163
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193 int opEquals(TOK type2) |
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194 { |
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195 return type == type2; |
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196 } |
239
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197 |
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198 /// Returns the Location of this token. |
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199 Location getLocation() |
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200 { |
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201 auto search_t = this.prev; |
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202 // Find previous newline token. |
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203 while (search_t.type != TOK.Newline) |
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204 search_t = search_t.prev; |
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205 auto filePath = search_t.filePath; |
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206 auto lineNum = search_t.lineNum - search_t.lineNum_hline; |
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207 auto lineBegin = search_t.end; |
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208 // Determine actual line begin and line number. |
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209 while (1) |
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210 { |
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211 search_t = search_t.next; |
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212 if (search_t == this) |
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213 break; |
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214 // Multiline tokens must be rescanned for newlines. |
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215 if (search_t.isMultiline) |
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216 { |
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217 auto p = search_t.start, end = search_t.end; |
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218 while (p != end) |
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219 { |
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220 if (scanNewline(p) == '\n') |
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221 { |
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222 lineBegin = p; |
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223 ++lineNum; |
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224 } |
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225 else |
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226 ++p; |
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227 } |
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228 } |
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229 } |
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230 return new Location(filePath, lineNum, lineBegin, this.start); |
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231 } |
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232 |
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233 uint lineCount() |
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234 { |
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235 uint count = 1; |
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236 if (this.isMultiline) |
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237 { |
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238 auto p = this.start, end = this.end; |
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239 while (p != end) |
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240 { |
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241 if (scanNewline(p) == '\n') |
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242 ++count; |
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243 else |
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244 ++p; |
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245 } |
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246 } |
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247 return count; |
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248 } |
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249 |
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250 /// Return the source text enclosed by the left and right token. |
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251 static char[] textSpan(Token* left, Token* right) |
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252 { |
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253 assert(left.end <= right.start || left is right ); |
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254 return left.start[0 .. right.end - left.start]; |
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255 } |
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256 |
239
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257 new(size_t size) |
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258 { |
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259 void* p = malloc(size); |
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260 if (p is null) |
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261 throw new OutOfMemoryException(__FILE__, __LINE__); |
239
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262 *cast(Token*)p = Token.init; |
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263 return p; |
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264 } |
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265 |
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266 delete(void* p) |
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267 { |
410
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268 auto token = cast(Token*)p; |
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269 if (token) |
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270 { |
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271 if(token.type == TOK.HashLine) |
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272 token.destructHashLineToken(); |
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273 else |
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274 { |
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275 version(D2) |
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276 if (token.isTokenStringLiteral) |
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277 token.destructTokenStringLiteral(); |
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278 } |
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279 } |
239
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280 free(p); |
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281 } |
410
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282 |
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283 void destructHashLineToken() |
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284 { |
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285 assert(type == TOK.HashLine); |
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286 delete tokLineNum; |
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287 delete tokLineFilespec; |
410
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288 } |
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289 |
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290 version(D2) |
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291 { |
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292 void destructTokenStringLiteral() |
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293 { |
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294 assert(type == TOK.String); |
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295 assert(start && *start == 'q' && start[1] == '{'); |
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296 assert(tok_str !is null); |
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297 auto tok_it = tok_str; |
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298 auto tok_del = tok_str; |
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299 while (tok_it && tok_it.type != TOK.EOF) |
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300 { |
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301 tok_it = tok_it.next; |
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302 assert(tok_del && tok_del.type != TOK.EOF); |
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303 delete tok_del; |
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304 tok_del = tok_it; |
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305 } |
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306 } |
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307 } |
208 | 308 } |
309 | |
487
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310 /++ |
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311 Not used at the moment. Could be useful if more |
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312 info is needed about the location of nodes/tokens. |
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313 +/ |
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314 struct NewlineInfo |
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315 { |
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316 char[] oriPath; /// Original path to the source text. |
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317 char[] setPath; /// Path set by #line. |
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318 uint oriLineNum; /// Actual line number in the source text. |
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319 uint setLineNum; /// Delta line number set by #line. |
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320 } |
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321 |
496
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322 /// Returns true if this token starts a DeclarationDefinition. |
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323 bool isDeclDefStartToken(TOK tok) |
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324 { |
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325 switch (tok) |
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326 { |
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327 alias TOK T; |
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328 case T.Align, T.Pragma, T.Export, T.Private, T.Package, T.Protected, |
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329 T.Public, T.Extern, T.Deprecated, T.Override, T.Abstract, |
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330 T.Synchronized, T.Static, T.Final, T.Const, T.Invariant/*D 2.0*/, |
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331 T.Auto, T.Scope, T.Alias, T.Typedef, T.Import, T.Enum, T.Class, |
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332 T.Interface, T.Struct, T.Union, T.This, T.Tilde, T.Unittest, T.Debug, |
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333 T.Version, T.Template, T.New, T.Delete, T.Mixin, T.Semicolon, |
508
943ecc9c133a
Added isIntegralType() to Token and refactored code.
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334 T.Identifier, T.Dot, T.Typeof: |
496
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335 return true; |
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336 default: |
508
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337 if (IntegralTypeBegin <= tok && tok <= IntegralTypeEnd) |
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338 return true; |
496
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339 } |
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340 return false; |
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341 } |
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|
342 |
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343 /// Returns true if this token starts a Statement. |
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344 bool isStatementStartToken(TOK tok) |
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345 { |
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346 switch (tok) |
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347 { |
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348 alias TOK T; |
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349 case T.Align, T.Extern, T.Final, T.Const, T.Auto, T.Identifier, T.Dot, |
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350 T.Typeof, T.If, T.While, T.Do, T.For, T.Foreach, T.Foreach_reverse, |
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351 T.Switch, T.Case, T.Default, T.Continue, T.Break, T.Return, T.Goto, |
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352 T.With, T.Synchronized, T.Try, T.Throw, T.Scope, T.Volatile, T.Asm, |
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353 T.Pragma, T.Mixin, T.Static, T.Debug, T.Version, T.Alias, T.Semicolon, |
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354 T.Enum, T.Class, T.Interface, T.Struct, T.Union, T.LBrace, T.Typedef, |
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355 T.This, T.Super, T.Null, T.True, T.False, T.Int32, T.Int64, T.Uint32, |
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356 T.Uint64, T.Float32, T.Float64, T.Float80, T.Imaginary32, |
507
996041463028
Removed TOK.WCharLiteral and TOK.DCharLiteral.
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357 T.Imaginary64, T.Imaginary80, T.CharLiteral, T.String, T.LBracket, |
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Removed TOK.WCharLiteral and TOK.DCharLiteral.
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358 T.Function, T.Delegate, T.Assert, T.Import, T.Typeid, T.Is, T.LParen, |
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Removed TOK.WCharLiteral and TOK.DCharLiteral.
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359 T.Traits/*D2.0*/, T.AndBinary, T.PlusPlus, T.MinusMinus, T.Mul, |
996041463028
Removed TOK.WCharLiteral and TOK.DCharLiteral.
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|
360 T.Minus, T.Plus, T.Not, T.Tilde, T.New, T.Delete, T.Cast: |
496
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361 return true; |
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|
362 default: |
508
943ecc9c133a
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|
363 if (IntegralTypeBegin <= tok && tok <= IntegralTypeEnd || |
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|
364 SpecialTokensBegin <= tok && tok <= SpecialTokensEnd) |
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|
365 return true; |
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|
366 } |
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|
367 return false; |
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|
368 } |
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|
369 |
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|
370 /// Returns true if this token starts an AsmInstruction. |
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371 bool isAsmInstructionStartToken(TOK tok) |
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372 { |
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|
373 switch(tok) |
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|
374 { |
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|
375 alias TOK T; |
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|
376 case T.In, T.Int, T.Out, T.Identifier, T.Align, T.Semicolon: |
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|
377 return true; |
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|
378 default: |
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|
379 } |
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|
380 return false; |
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|
381 } |