annotate examples/mpp/token.h @ 22:5581ef01f993

Regen all the AG output. This also fixes the line number output in the tools (cgbigen/helpgen/help2html), apparently because those files weren't regenerated last go.
author David A. Holland
date Mon, 13 Jun 2022 00:06:39 -0400
parents 13d2b8934445
children
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1 /*
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2 * AnaGram, a System for Syntax Directed Programming
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3 * C Macro preprocessor
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4 * Token handling definitions
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5 *
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6 * Copyright 1993 Parsifal Software. All Rights Reserved.
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7 *
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8 * This software is provided 'as-is', without any express or implied
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9 * warranty. In no event will the authors be held liable for any damages
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10 * arising from the use of this software.
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11 *
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12 * Permission is granted to anyone to use this software for any purpose,
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13 * including commercial applications, and to alter it and redistribute it
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14 * freely, subject to the following restrictions:
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15 *
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16 * 1. The origin of this software must not be misrepresented; you must not
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17 * claim that you wrote the original software. If you use this software
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18 * in a product, an acknowledgment in the product documentation would be
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19 * appreciated but is not required.
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20 * 2. Altered source versions must be plainly marked as such, and must not be
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21 * misrepresented as being the original software.
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22 * 3. This notice may not be removed or altered from any source distribution.
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23 */
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24
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25 #ifndef TOKEN_H
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26 #define TOKEN_H
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27
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28 #include <assert.h>
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29 #include <string.h>
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30 #include <stdlib.h>
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31 #include "charsink.h"
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32 #include "strdict.h"
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33
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34 extern string_dictionary td;
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35
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36
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37 // define token identification codes
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38
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39 enum token_id {
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40 END_OF_FILE =0,
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41 SPACE =' ',
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42 ANDAND ='A', // "&&"
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43 ANDassign, // "&="
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44 ARROW, // "->"
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45 CONCAT, // "##"
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46 DECR, // "--"
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47 DIVassign, // "/="
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48 ELLIPSIS, // "..."
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49 EQ, // "=="
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50 ERassign, // "^="
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51 GE, // ">="
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52 ICR, // "++"
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53 LE, // "<="
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54 LS, // "<<"
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55 LSassign, // "<<="
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56 MODassign, // "%="
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57 MINUSassign, // "-="
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58 MULTassign, // "*="
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59 NE, // "!="
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60 ORassign, // "|="
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61 OROR, // "||"
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62 PLUSassign, // "+="
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63 RS, // ">>"
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64 RSassign, // ">>="
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65 CHARACTERconstant, // character constant
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66 STRINGliteral, // character string
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67 HEXconstant =129,
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68 OCTconstant,
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69 DECconstant,
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70 FLOATconstant, // real
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71 NAME,
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72 AUTO, // "auto"
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73 BREAK, // "break"
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74 CASE, // "case"
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75 CHAR, // "char"
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76 CONSTANT, // "const"
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77 CONTINUE, // "continue"
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78 DEFAULT, // "default"
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79 DO, // "do"
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80 DOUBLE, // "double"
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81 ELSE, // "else"
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82 ENUM, // "enum"
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83 EXTERN, // "extern"
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84 FLOAT, // "float"
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85 FOR, // "for"
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86 GOTO, // "goto"
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87 IF, // "if"
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88 INT, // "int"
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89 LONG, // "long"
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90 REGISTER, // "register"
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91 RETURN, // "return"
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92 SHORT, // "short"
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93 SIGNED, // "signed"
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94 SIZEOF, // "sizeof"
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95 STATIC, // "static"
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96 STRUCT, // "struct"
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97 SWITCH, // "switch"
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98 TYPEDEF, // "typedef"
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99 UNION, // "union"
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100 UNSIGNED, // "unsigned"
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101 VOIDkey, // "void"
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102 VOLATILE, // "volatile"
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103 WHILE, // "while"
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104 UNRECOGNIZED
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105 };
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106
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107 struct token {
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108 unsigned handle; // token dictionary index
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109 token_id id; // token type
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110 };
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111
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112 // Token sink class
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113
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114 class token_sink {
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115 public:
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116 virtual ~token_sink() {}
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117 virtual token_sink &operator << (token) = 0;
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118 virtual token_sink &operator << (token *) = 0;
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119 friend int error(token_sink &);
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120 };
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121
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122
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123 // Token accumulator
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124 // Member functions that are not inline are in token.cpp
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125
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126 class token_accumulator : public token_sink {
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127 token *cs;
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128 unsigned *xs;
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129 unsigned csx;
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130 unsigned xsx;
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131 unsigned csmax;
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132 unsigned xsmax;
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133 public:
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134
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135 // Constructor
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136
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137 token_accumulator(int nc, int nx = 1);
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138
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139
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140 // Destructor
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141
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142 ~token_accumulator();
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143
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144
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145 // Reset token accumulator
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146
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147 friend token_accumulator &reset(token_accumulator &);
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148
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149
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150 // Change levels
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151
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152 token_accumulator& operator ++(){
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153 assert(xsx); // Room for another level?
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154 xs[--xsx] = csx;
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155 return *this;
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156 }
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157
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158 token_accumulator& operator --() {
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159 csx = xs[xsx++];
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160 assert(xsx < xsmax); // Have to leave last level active
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161 return *this;
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162 }
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163
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164
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165 // Push data
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166
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167 token_sink& operator << (token c) {
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168 assert(csx < csmax); // room for data?
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169 cs[csx++] = c;
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170 return *this;
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171 }
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172
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173 token_sink &operator << (token *tp);
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174
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175 token_sink &operator << (token_accumulator &t) {
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176 assert(this != &t); // prevent disaster
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177 return *this << (token *) t;
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178 }
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179
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180 // Pop data
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181
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182 token_accumulator &operator >> (token &c);
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183
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184
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185 // Access data
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186
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187 //token &operator [](unsigned);
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188
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189 operator token *() {
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190 cs[csx].id = END_OF_FILE;
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191 cs[csx].handle = 0;
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192 return &cs[xs[xsx]];
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193 }
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194
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195
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196 // Concatenate token strings
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197
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198 friend token_accumulator& concat(token_accumulator &);
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199
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200
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201 // Make permanent copy of token string
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202
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203 friend token *copy(token_accumulator &);
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204
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205
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206 // Get size of token string
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207
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208 friend unsigned size(token_accumulator &s);
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209
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210 // Check for error
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211
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212 friend int error(token_accumulator &t);
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213
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214 };
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215
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216 inline unsigned size(token_accumulator &s) {
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217 return s.csx - s.xs[s.xsx];
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218 }
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219
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220 inline int error(token_accumulator &t) {
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221 return t.csx >= t.csmax || t.xsx >= t.xsmax;
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222 }
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223
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224
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225
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226 // Token Translator class
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227
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228 class token_translator : public token_sink {
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229 character_sink *cs;
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230 int space_required;
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231 public:
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232
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233
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234 // Constructor
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235
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236 token_translator(character_sink *sink) {
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237 cs = sink;
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238 space_required = 0;
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239 }
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240
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241
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242 // Accept data
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243
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244 token_sink &operator << (token t) {
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245 if (space_required && t.id > 128) *cs << ' ';
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246 *cs << td[t.handle];
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247 space_required = t.id > 128;
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248 return *this;
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249 }
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250
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251 token_sink &operator << (token *tp);
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252
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253
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254 // Check for error;
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255 friend int error(token_sink &) {return 0;}
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256 };
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257
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258 #endif