annotate anagram/agcore/ftpar.h @ 17:12171da8943f

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author David A. Holland
date Tue, 31 May 2022 01:56:37 -0400
parents 13d2b8934445
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1 /*
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2 * AnaGram, A System for Syntax Directed Programming
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3 * Copyright 1993-2002 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 * ftpar.h
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7 */
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8
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9 #ifndef FTPAR_H
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10 #define FTPAR_H
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11
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12 class Token; // from token.h
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13 struct tsd; // from tsd.h
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14 #include "agarray.h"
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15 #include "agsignal.h"
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16 #include "agstack.h"
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17 #include "cint.h"
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18
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19
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20 extern AgArray<unsigned> traceCounts;
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21
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22 int precedes(cint a, cint b);
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23
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24
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25 class FtParser {
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26 public:
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27 enum ProcessState {
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28 ready,
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29 running,
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30 finished,
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31 syntaxError,
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32 unexpectedEndOfFile,
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33 selectionRequired,
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34 selectionError
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35 };
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36
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37 class State {
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38 public:
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39 friend class FtParser;
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40 friend class FtParserDc;
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41 friend class FtParserReductionDc;
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42 friend class FileTraceWindow;
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43 friend class GTView;
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44 friend class GTWindow;
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45 friend class TokenMenuDc;
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46
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47 int number;
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48 int line, column, charPos;
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49 const unsigned char *pointer;
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50 unsigned token;
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51
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52 public:
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53 State(char *p)
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54 : number(0)
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55 , line(0)
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56 , column(0)
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57 , charPos(0)
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58 , pointer((const unsigned char*) p)
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59 , token(0)
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60 {}
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61 State()
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62 : number(0)
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63 , line(0)
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64 , column(0)
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65 , charPos(0)
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66 , pointer(0)
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67 , token(0)
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68 {}
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69 State(unsigned sn, unsigned tn)
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70 : number(sn)
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71 , line(0)
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72 , column(0)
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73 , charPos(0)
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74 , pointer(0)
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75 , token(tn)
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76 {}
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77
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78 cint position() { return cint(charPos,line); }
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79 int operator < (const State &s) const { return number < s.number; }
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80 };
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81
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82 struct Transaction {
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83 int count;
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84 State state;
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85
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86 Transaction() : count(0) {}
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87 Transaction(int c, State s) : count(c), state(s) {}
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88 int operator < (const Transaction &t) const { return count < t.count; }
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89 };
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90
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91 struct StackChanged {
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92 int newSize;
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93 StackChanged() : newSize(0) {}
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94 StackChanged(int n) : newSize(n) {}
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95 };
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96
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97 AgString text;
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98 State state;
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99 State reductionState;
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100
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101 tsd *initialStack;
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102
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103 AgStack<State> stateStack;
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104 AgStack<State> auxStack;
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105 AgStack<Transaction> transStack;
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106 const unsigned char *lookAhead;
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107 const unsigned char *endPointer;
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108 unsigned inputToken;
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109 int nNullShifts;
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110 ProcessState processState;
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111 static const char *processStateText[];
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112
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113 unsigned actionParameter;
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114
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115 int ruleLength;
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116 int ruleToReduce;
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117 int reductionIndex;
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118 int reductionSelection;
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119
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120 //DcRef<FtParserDc> displayControl;
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121 struct BroadcastStackChanged : public Broadcaster<StackChanged> {
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122 FtParser &parser;
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123 BroadcastStackChanged(FtParser &p) : parser(p) {}
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124 void operator () (unsigned n) const {
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125 broadcast(FtParser::StackChanged(n));
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126 }
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127 };
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128
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129 BroadcastStackChanged stackChanged;
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130 //DcRef<rule_stack_dc> ruleControl;
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131 //tsd *itemStack;
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132
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133 int testingKeyword;
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134
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135 void track(void);
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136 void dispatchReductionToken();
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137
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138 void shiftTerminal();
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139 void shiftTerminalAndAccept(void);
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140 void shiftTerminalAndReduce();
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141 void reduce(void);
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142 void skip(void);
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143 void shiftNull(void);
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144 void error();
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145 void accept();
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146
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147 int shiftNonterminalAndReduce();
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148 int shiftNonterminal();
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149 int shiftNonterminalAndAccept();
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150
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151 static void (FtParser::*terminalAction[11])();
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152 static int (FtParser::*nonterminalAction[4])();
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153
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154 Token keyToken(void);
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155 void getToken();
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156 unsigned inspectToken();
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157 void completeReduction(int reductionToken);
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158 void completeReduction();
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159 int validToken(unsigned, unsigned);
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160 int validSelection(unsigned, unsigned);
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161 void requestSelection(int actionParameter);
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162
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163 public:
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164 FtParser &parseTo(unsigned char *target);
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165 FtParser &parseTo(cint *target);
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166 FtParser &parse(const char *fragment);
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167 FtParser &prime(const char *fragment);
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168 FtParser &parse();
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169 void parseAction();
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170 void stepToken(unsigned);
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171 void parseToken(unsigned);
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172
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173 FtParser &step();
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174 FtParser &step(char *fragment);
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175 FtParser &reset();
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176 cint location() { return cint(state.charPos, state.line); }
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177 cint displayLocation() { return cint(state.column, state.line); }
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178
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179 FtParser &ignoreKeyword(int k) {
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180 testingKeyword = k;
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181 return *this;
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182 }
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183
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184 tsd *x1x_new();
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185
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186 FtParser(AgString t);
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187 FtParser();
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188 FtParser(tsd *initialStack_);
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189 ~FtParser();
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190 };
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191
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192
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193 #endif /* FTPAR_H */