【编译原理笔记】Token符号表
符号表是词法分析阶段最重要的基本原则。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 | // Copyright 2009 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // Token is the set of lexical tokens of the Go programming language. type Token int // The list of tokens. const ( // Special tokens ILLEGAL Token = iota EOF COMMENT literal_beg // Identifiers and basic type literals // (these tokens stand for classes of literals) IDENT // main INT // 12345 FLOAT // 123.45 IMAG // 123.45i CHAR // 'a' STRING // "abc" literal_end operator_beg // Operators and delimiters ADD // + SUB // - MUL // * QUO // / REM // % AND // & OR // | XOR // ^ SHL // << SHR // >> AND_NOT // &^ ADD_ASSIGN // += SUB_ASSIGN // -= MUL_ASSIGN // *= QUO_ASSIGN // /= REM_ASSIGN // %= AND_ASSIGN // &= OR_ASSIGN // |= XOR_ASSIGN // ^= SHL_ASSIGN // <<= SHR_ASSIGN // >>= AND_NOT_ASSIGN // &^= LAND // && LOR // || ARROW // <- INC // ++ DEC // -- EQL // == LSS // < GTR // > ASSIGN // = NOT // ! NEQ // != LEQ // <= GEQ // >= DEFINE // := ELLIPSIS // ... LPAREN // ( LBRACK // [ LBRACE // { COMMA // , PERIOD // . RPAREN // ) RBRACK // ] RBRACE // } SEMICOLON // ; COLON // : operator_end keyword_beg // Keywords BREAK CASE CHAN CONST CONTINUE DEFAULT DEFER ELSE FALLTHROUGH FOR FUNC GO GOTO IF IMPORT INTERFACE MAP PACKAGE RANGE RETURN SELECT STRUCT SWITCH TYPE VAR keyword_end additional_beg // additional tokens, handled in an ad-hoc manner TILDE additional_end ) var tokens = [...]string{ ILLEGAL: "ILLEGAL" , EOF: "EOF" , COMMENT: "COMMENT" , IDENT: "IDENT" , INT: "INT" , FLOAT: "FLOAT" , IMAG: "IMAG" , CHAR: "CHAR" , STRING: "STRING" , ADD: "+" , SUB: "-" , MUL: "*" , QUO: "/" , REM: "%" , AND: "&" , OR: "|" , XOR: "^" , SHL: "<<" , SHR: ">>" , AND_NOT: "&^" , ADD_ASSIGN: "+=" , SUB_ASSIGN: "-=" , MUL_ASSIGN: "*=" , QUO_ASSIGN: "/=" , REM_ASSIGN: "%=" , AND_ASSIGN: "&=" , OR_ASSIGN: "|=" , XOR_ASSIGN: "^=" , SHL_ASSIGN: "<<=" , SHR_ASSIGN: ">>=" , AND_NOT_ASSIGN: "&^=" , LAND: "&&" , LOR: "||" , ARROW: "<-" , INC: "++" , DEC: "--" , EQL: "==" , LSS: "<" , GTR: ">" , ASSIGN: "=" , NOT: "!" , NEQ: "!=" , LEQ: "<=" , GEQ: ">=" , DEFINE: ":=" , ELLIPSIS: "..." , LPAREN: "(" , LBRACK: "[" , LBRACE: "{" , COMMA: "," , PERIOD: "." , RPAREN: ")" , RBRACK: "]" , RBRACE: "}" , SEMICOLON: ";" , COLON: ":" , BREAK: "break" , CASE: "case" , CHAN: "chan" , CONST: "const" , CONTINUE: "continue" , DEFAULT: "default" , DEFER: "defer" , ELSE: "else" , FALLTHROUGH: "fallthrough" , FOR: "for" , FUNC: "func" , GO: "go" , GOTO: "goto" , IF: "if" , IMPORT: "import" , INTERFACE: "interface" , MAP: "map" , PACKAGE: "package" , RANGE: "range" , RETURN: "return" , SELECT: "select" , STRUCT: "struct" , SWITCH: "switch" , TYPE: "type" , VAR: "var" , TILDE: "~" , } // String returns the string corresponding to the token tok. // For operators, delimiters, and keywords the string is the actual // token character sequence (e.g., for the token ADD, the string is // "+"). For all other tokens the string corresponds to the token // constant name (e.g. for the token IDENT, the string is "IDENT"). // func (tok Token) String() string { s := "" if 0 <= tok && tok < Token(len(tokens)) { s = tokens[tok] } if s == "" { s = "token(" + strconv.Itoa(int(tok)) + ")" } return s } |
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