annotate anagram/agcore/lexeme.cpp @ 12:aab9ff6af791

Strengthen the build hack for non-DOS targets.
author David A. Holland
date Tue, 31 May 2022 00:58:42 -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 * Copyright 1993-1999 Parsifal Software. All Rights Reserved.
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4 * See the file COPYING for license and usage terms.
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5 *
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6 * lexeme.cpp - lexeme analysis
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7 */
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8
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9 #include "arrays.h"
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10 #include "config.h"
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11 #include "data.h"
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12 #include "dict.h"
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13 #include "keyword.h"
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14 #include "lexeme.h"
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15 #include "q1glbl.h"
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16 #include "q5.h"
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17 #include "rpk.h"
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18 #include "rule.h"
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19 #include "stacks.h"
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20 #include "token.h"
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21 #include "tree.h"
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22 #include "tsd.h"
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23
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24 //#define INCLUDE_LOGGING
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25 #include "log.h"
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26
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27
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28 #define FIX3
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29
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30 AgStack<int> disregardList;
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31 unsigned disregard_token;
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32
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33
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34 // Find and mark the lexical rules.
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35 static void find_lexical_rules(void) {
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36 LOGSECTION("find_lexical_rules");
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37 unsigned ku;
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38 int k;
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39 iws();
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40 LOGS("disregard list tokens");
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41 // First, all the disregard tokens
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42 for (ku = disregardList.size(); ku--;) {
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43 //xws(disregard_list[ku]);
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44 xws(disregardList[ku]);
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45 //Token(disregardList[ku])->disregard = 1;
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46 LOGV(disregardList[ku]);
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47 }
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48 // Then all the lexemes
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49 LOGS("lexemes");
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50 for (ku = 0; ku++ < ntkns;) if (map_token_number[ku].lexeme) {
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51 xws(ku);
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52 LOGV(ku);
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53 }
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54 // rules produced by disregard tokens and lexemes are
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55 // lexical rules. Any rule produced by a token found
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56 // in a lexical rule is also a lexical rule.
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57 // This loop, in other words, implements a closure
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58 LOGS("lexical rules");
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59 for (k = 0; k < tis(); k++) {
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60 int tn = list_base[k];
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61 int *bnf = bnf_table->sb;
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62 int nbnf = bnf_table->nt;
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63 while (nbnf--) {
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64 int t = *bnf++, f = *bnf++, n;
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65
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66 if (t != tn) {
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67 continue;
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68 }
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69 Rule rule(f);
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70 n = rule->length();
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71 rule->lexical = 1;
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72 LOGV(rule) LCV(rule->lexical);
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73 while (n--) {
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74 Token token = rule.token(n);
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75 if (token->non_terminal_flag) {
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76 xws(token);
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77 LOGV(token);
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78 }
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79 }
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80 }
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81 }
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82 rws();
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83 }
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84
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85 static void build_noise_token(void) {
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86 LOGSECTION("build_noise_token");
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87 LOGV(disregardList.size());
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88 if (disregardList.size() == 1) {
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89 disregard_token = vp_6(disregardList[0]);
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90 Token token = disregardList[0];
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91 token->disregard = 1;
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92 }
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93 else {
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94 int n = disregardList.size();;
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95 //int *lb = disregard_list;
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96 iws();
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97 int i;
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98 for (i = 0; i < n; i++) {
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99 ruleElementStack
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100 .push(AgStack<RuleElement>())
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101 .top()
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102 .push(RuleElement(disregardList[i],0));
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103 aws(vp_form3(0));
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104 }
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105 disregard_token = vp_4();
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106 }
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107 extern Token vpRepeatToken;
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108 Token disregard = Token(disregard_token);
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109 disregard->disregard = 1;
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110 vpRepeatToken->disregard = 1;
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111 LOGV(disregard);
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112 LOGV((int) vpRepeatToken);
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113 }
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114
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115 static int in_disregard_list(int tn) {
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116 LOGSECTION("in_disregard_list");
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117 int n = disregardList.size();
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118 while (n--) {
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119 if (tn == disregardList[n]) {
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120 return 1;
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121 }
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122 }
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123 return 0;
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124 }
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125
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126 static void subs_bnf(int tn, int nt) {
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127 int *p = bnf_table->sb;
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128 int n = bnf_table->nt;
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129 for (; n--; p += 2) {
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130 if (*p != tn) {
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131 continue;
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132 }
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133 *p = nt;
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134 Rule rule(p[1]);
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135 if ((int)rule->prim_tkn == tn) {
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136 rule->prim_tkn = nt;
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137 }
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138 }
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139 }
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140
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141 static int alias(Token token) {
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142 LOGSECTION("alias");
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143
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144 Token pureToken = Token::create();
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145 LOGV(token) LCV(pureToken);
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146 map_token_number[pureToken] = map_token_number[token];
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147 LOGV(token) LCV(token->value_type) LCV(token->immediate_action);
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148 LOGV(pureToken) LCV(pureToken->value_type) LCV(token->immediate_action);
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149 if (token->key) {
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150 Keyword keyword =token->key;
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151 keyword->token_number = pureToken;
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152 }
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153 pureToken->pure = 1;
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154 LOGV(token->non_terminal_flag) LCV(token->token_set_id);
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155 if (token->non_terminal_flag) {
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156 LOGS("Substituting") LCV(token) LCV(pureToken);
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157 subs_bnf(token,pureToken);
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158 }
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159 token->junky = 1;
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160 if (token->token_set_id) {
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161 LOGV(token->token_set_id);
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162 pureToken->token_set_id = token->token_set_id;
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163 token->token_set_id = 0;
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164 int n = part_dict->nsx;
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165 while (n--) if (map_part_number[n].token_number == (unsigned) token) {
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166 map_part_number[n].token_number = pureToken;
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167 LOGV(n);
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168 break;
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169 }
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170 for (Each<Rule> rule; rule.loopNotFinished(); rule.getNext()) {
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171 if ((int) rule->prim_tkn == token) {
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172 rule->prim_tkn = pureToken;
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173 LOGV(rule);
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174 }
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175 }
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176 for (unsigned i = 0; i < n_chars; i++) {
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177 if (map_char_number[i].token_number == (unsigned) token) {
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178 map_char_number[i].token_number = pureToken;
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179 }
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180 }
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181 }
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182 else if (token->part_number) {
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183 LOGV(token->part_number);
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184 pureToken->part_number = token->part_number;
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185 map_part_number[token->part_number].token_number = pureToken;
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186 token->part_number = 0;
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187 for (Each<Rule> rule; rule.loopNotFinished(); rule.getNext()) {
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188 if ((int) rule->prim_tkn == token) {
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189 rule->prim_tkn = pureToken;
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190 LOGV(rule);
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191 }
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192 }
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193 for (unsigned i = 0; i < n_chars; i++) {
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194 if (map_char_number[i].token_number == (unsigned) token) {
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195 map_char_number[i].token_number = pureToken;
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196 }
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197 }
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198 }
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199 Rule rule = makeRule(pureToken, disregard_token);
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200 at(bnf_table, (int)token, (int)rule);
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201 token->non_terminal_flag = 1;
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202 rule->prim_tkn = token;
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203 ParseTree parseTree = token->parse_tree;
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204 if (parseTree) {
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205 parseTree->token_number = pureToken;
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206 }
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207 LOGV((int) token) LCV(token->value_type);
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208 LOGV((int) pureToken) LCV(pureToken->value_type);
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209 return pureToken;
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210 }
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211
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212 #ifdef NOT_FIX3
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213
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214 static AgStack<int> findRules(Token token) {
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215 AgStack<int> rules;
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216 int *p = bnf_table->sb;
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217 int n = bnf_table->nt;
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218 for (; n--; p += 2) {
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219 if (*p != (int) token) continue;
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220 rules.push(p[1]);
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221 }
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222 return rules;
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223 }
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224 #endif
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225
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226 /*
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227 scan rules, and and mark token usage as lexical, non-lexical or both
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228 then, for each token that has both lexical and non lexical usage,
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229 make a clone
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230 */
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231
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232 void set_lexemes(void) {
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233 int nf = nforms;
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234 nInputRules = nforms;
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235 LOGSECTION("set_lexemes");
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236 LOGV(nforms);
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237
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238 disregard_token = 0;
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239 if (disregardList.size() == 0) return;
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240 LocalArray<int> newTokenNumber(ntkns+1);
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241 #ifdef NOT_FIX3
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242 int maxTokenNumber = ntkns;
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243 #endif
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244 memset(newTokenNumber, 0, (ntkns+1)*sizeof(*newTokenNumber));
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245 Each<Rule> rule;
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246 #ifdef INCLUDE_LOGGING
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247 for (rule.restart(); (int) rule <= nf; rule.getNext()) {
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248 LOGV(rule) LCV(rule->lexical);
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249 }
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250 #endif
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251 find_lexical_rules();
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252 #ifdef INCLUDE_LOGGING
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253 for (rule.restart(); (int) rule <= nf; rule.getNext()) {
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254 LOGV(rule) LCV(rule->lexical);
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255 }
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256 #endif
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257 build_noise_token();
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258 //#ifdef FIX3
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259 // mark lexical tokens
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260 for (rule.restart(); (int) rule <= nf; rule.getNext()) {
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261 int n = rule->length();
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262 LOGV(rule) LCV(rule->lexical);
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263 if (n == 0 || !rule->lexical) {
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264 continue;
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265 }
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266 while (n--) {
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267 Token token = rule.token(n);
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268 token->lexical = 1;
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269 }
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270 }
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271 //#endif
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272
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273 // Scan rules which are _not_ lexical
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274 for (rule.restart(); (int) rule <= nf; rule.getNext()) {
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275 int n = rule->length();
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276 LOGV(rule) LCV(rule->lexical);
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277 if (n == 0 || rule->lexical) {
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278 continue;
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279 }
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280 LOGSECTION("Scanning non-lexical rule");
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281 LOGV(rule);
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282 while (n--) {
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283 Token token = rule.token(n);
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284 LOGV(token) LCV(token->token_set_id) LCV(token->non_terminal_flag);
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285 LOGV(token->lexeme) LCV(token->lexical) LCV(in_disregard_list(token));
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286 LOGV(token->disregard);
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287 if (newTokenNumber[token] ||
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288 in_disregard_list(token) ||
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289 (token->non_terminal_flag && token->token_set_id) ||
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290 token->disregard ||
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291 (int) token == eof_token ||
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292 (int) token == error_token) {
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293 continue;
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294 }
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295 if (token->non_terminal_flag && !token->lexeme) {
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296 continue;
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297 }
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298 // newTokenNumber is the pure token
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299 newTokenNumber[token] = alias(token);
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300 LOGV(token) LCV(newTokenNumber[token]);
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301 }
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302 }
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303 #ifdef FIX3
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304 for (rule.restart(); (int) rule <= nf; rule.getNext()) {
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305 int n = rule->length();
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306 LOGV(rule) LCV(rule->lexical);
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307 if (n == 0 || rule->lexical) {
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308 continue;
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309 }
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310 LOGSECTION("Scanning non-lexical rule");
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311 LOGV(rule);
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312 while (n--) {
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313 Token token = rule.token(n);
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314 LOGV(token) LCV(token->token_set_id) LCV(token->non_terminal_flag);
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315 LOGV(token->lexeme) LCV(token->lexical) LCV(in_disregard_list(token));
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316 LOGV(token->disregard);
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317 if (newTokenNumber[token] ||
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318 in_disregard_list(token) ||
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319 (token->non_terminal_flag && token->token_set_id) ||
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320 token->disregard ||
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321 (int) token == eof_token ||
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322 (int) token == error_token) {
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323 continue;
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324 }
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325 if (token->non_terminal_flag && !token->lexical) {
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326 continue;
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327 }
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328 // newTokenNumber is the pure token
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329 newTokenNumber[token] = alias(token);
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330 LOGV(token) LCV(newTokenNumber[token]);
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331 }
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332 }
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333 #endif
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334 #ifdef NOT_FIX3
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335 for (rule.restart(); (int) rule <= nf; rule.getNext()) {
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336 int n = rule->length();
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337 if (n == 0 || rule->lexical) {
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338 continue;
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339 }
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340 while (n-- > 0) {
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341 Token token = rule.token(n);
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342 if ((int) token >= maxTokenNumber || newTokenNumber[token]) continue;
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343 if (newTokenNumber[token] ||
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344 in_disregard_list(token) ||
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345 (int) token == eof_token ||
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346 (token->non_terminal_flag && token->token_set_id) ||
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347 (int) token == error_token) {
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348 continue;
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349 }
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350 if (token->non_terminal_flag && !token->lexical) {
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351 continue;
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352 }
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353 AgStack<int> ruleList = findRules(token);
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354 Token newToken = Token::create();
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355 map_token_number[newToken] = map_token_number[token];
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356 subs_bnf(token, newToken);
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357 newTokenNumber[token] = newToken;
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358 newToken->pure = 1;
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359 int i;
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360 for (i = 0; i < ruleList.size(); i++) {
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361 Rule oldRule = ruleList[i];
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362 Rule newRule = Rule::create();
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363 map_form_number[newRule] = map_form_number[oldRule];
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364 int k = oldRule->elementList.size();
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365 newRule->elementList = AgArray<RuleElement>(k);
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366 while (k--) {
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367 newRule->elementList[k] = oldRule->elementList[k];
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368 }
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369 newRule->lexical = 0;
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370 at(bnf_table,(int)token,(int)newRule);
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371 token->non_terminal_flag = 1;
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372 newRule->prim_tkn = token;
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373 }
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374 }
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375 }
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376 #endif
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377 LOGS("alias loop complete");
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378 for (rule.restart(); rule.loopNotFinished(); rule.getNext()) {
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379 int n = rule->length();
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380 LOGV(rule) LCV(rule->lexical);
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381 if (n == 0) continue;
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382 if (!rule->lexical) continue;
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383 LOGSECTION("Substitution loop");
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384 while (n-- > 0) {
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385 Token token = rule.token(n);
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386 if (newTokenNumber[token] == 0) {
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387 continue;
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388 }
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389 rule.token(n) = newTokenNumber[token];
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390 LOGV(token) LCV(newTokenNumber[token]);
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391 }
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392 }
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393 LOGS("Rule loop complete");
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394 nforms_base = nforms;
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395 }
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396
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397