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annotate tests/agcl/contrib/yabasic.syn @ 0:13d2b8934445

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Import AnaGram (near-)release tree into Mercurial.
author David A. Holland
date Sat, 22 Dec 2007 17:52:45 -0500
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1 {
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2
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3 /*
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4 YABASIC --- a tiny integrated Basic Compiler/Interpreter
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5
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6 BISON - part
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7
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8 this Program is subject to the GNU General Public License;
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9 see the file yabasic.c for details.
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10 */
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11
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12
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13 //#undef WINDOWS
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14 #include "yabasic.h" /* definitions of yabasic */
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15 #include <malloc.h>
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16
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17 #if HAVE_ALLOCA_H
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18 #include <alloca.h>
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19 #endif
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20
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21 void __yy_bcopy(char *,char *,int); /* prototype missing */
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22
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23 int yylineno=1;
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24 int yylex(void);
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25
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26 char *popString(int);
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27 void pushChar(int);
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28
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29 }
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30
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31 [
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32 ~case sensitive
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33 disregard white space
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34 lexeme {digit string, name, STRING, STRSYM, number}
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35 distinguish lexemes
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36 parser name = parseBasic
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37 line numbers
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38 escape backslashes
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39 ]
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40
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41 white space = ' ' + '\t'
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42
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43 //(double *) step_part
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44
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45
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46 SEP
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47 -> ["REM", ~(eof + white space + '\n')?...], '\n' ={
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48 yylineno++;
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49 if (interactive) PCB.exit_flag = AG_SUCCESS_CODE;
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50 return;
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51 }
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52
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53 (double) number
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54 -> simple real
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55 -> simple real:x, 'e'+'E', '+'?,exponent:e =x*pow(10,e);
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56 -> simple real:x, 'e'+'E', '-',exponent:e =x*pow(10,-e);
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57
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58 (double) simple real
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59 -> integer part:i, '.', fraction part:f = i+f;
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60 -> integer part, '.'?
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61 -> '.', fraction part:f = f;
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62
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63 (double) integer part
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64 -> digit:d = d-'0';
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65 -> integer part:x, digit:d = 10*x + d-'0';
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66
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67 (double) fraction part
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68 -> digit:d =(d-'0')/10.;
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69 -> digit:d, fraction part:f =(d-'0' + f)/10.;
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70
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71 (int) exponent
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72 -> digit:d = d-'0';
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73 -> exponent:x, digit:d = 10*x + d-'0';
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74
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75 (int) name //value of name token is length of name string
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76 -> letter: c =pushChar(c), 1;
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77 -> name:k, letter+digit: c =pushChar(c), k+1;
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78
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79
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80 (char *) SYMBOL
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81 -> name:k =strdup(popString(k));
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82
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83 (char *) STRSYM
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84 -> name:k, '$' =pushChar('$'), strdup(popString(k+1));
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85
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86 (char *) DIGITS
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87 -> digit string:k =strdup(popString(k));
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88
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89 (int) digit string
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90 -> digit:d =pushChar(d), 1;
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91 -> digit string:k, digit:d =pushChar(d), k+1;
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92
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93 (char *) STRING
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94 -> '"', string text:k, '"' =strdup(popString(k));
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95 -> '"', string text:k, '\n' =strdup(popString(k));
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96
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97 (int) string text
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98 -> =0;
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99 -> string text:k, ~(eof + '"' + '\n'):c =pushChar(c), k+1;
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100 -> string text:k, "\\\"" =pushChar('"'), k+1;
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101
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102 /*
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103 [
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104 left {"OR"}
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105 left {"AND"}
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106 left {"NOT"}
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107 left {'-', '+'}
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108 left {'*', '/'}
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109 left {'^'}
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110 nonassoc {UMINUS}
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111 ]
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112 */
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113
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114 letter = 'a-z' + 'A-Z'
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115 digit = '0-9'
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116 eof = 0 + -1
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117
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118
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119 program $
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120 -> statement list, eof =end_of_file = TRUE;
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121
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122 statement list
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123 ->
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124 /*
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125 -> statement_list, !{
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126 if (errorlevel<=ERROR) {YYABORT;}},
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127 SEP, !{
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128 yylineno+=$3;},
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129 statement
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130 */
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131 -> statement list, SEP, statement
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132 -> statement list, SEP, label, statement
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133
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134 label
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135 -> "LABEL", SYMBOL:s =create_label(s);
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136 -> DIGITS:s =create_label(s);
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137
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138
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139 statement /* empty */
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140 ->
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141 -> string_assignment
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142 -> assignment
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143 -> for_loop
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144 -> if_clause
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145 -> "GOTO", symbol_or_lineno:s ={create_goto(s);}
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146 -> "GOSUB", symbol_or_lineno:s ={create_gosub(s);}
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147 -> "ON", "INTERRUPT", "BREAK" ={create_exception(TRUE);}
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148 -> "ON", "INTERRUPT", "CONTINUE" ={create_exception(FALSE);}
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149 -> "ON", expression, "GOTO", !{create_skipper();}, goto_list ={create_nop();}
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150 -> "ON", expression, "GOSUB", !{create_skipper();}, gosub_list ={create_nop();}
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151 // -> LABEL, symbol_or_lineno ={create_label($2);}
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152 -> "OPEN", hashed_number:n, ',', string expression, ',', string expression ={create_myopen(n,'+');}
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153 -> "OPEN", hashed_number:n, ',', string expression ={create_myopen(n,'-');}
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154 -> "CLOSE", hashed_number:n ={create_myclose(n);}
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155 -> "PRINT", printintro, printlist, !{
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156 create_revert(FALSE);},
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157 semicolon
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158 -> "INPUT", inputintro, inputlist =lastinput->args=0;
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159 -> "READ", readlist
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160 -> "DATA", datalist
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161 -> "RESTORE" =create_restore("");
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162 -> "RESTORE", symbol_or_lineno:s =create_restore(s);
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163 -> "RETURN" ={create_return();}
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164 -> "DIM", dimlist
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165 -> "OPEN", "WINDOW", expression, ',', expression =create_openwin(FALSE);
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166 -> "OPEN", "WINDOW", expression, ',', expression, ',', string expression ={create_openwin(TRUE);}
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167 -> "DOT", mapping =create_dot();
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168 -> "LINE", mapping, "TO", mapping =create_line('l');
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169 -> "CIRCLE", mapping, ',', expression =create_circle();
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170 -> "TEXT", string expression, ',', mapping =create_text(TRUE);
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171 -> "TEXT", mapping, ',', string expression =create_text(FALSE);
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172 -> "MAP", expression, ',', expression, ',', expression, ',', expression, "TO", expression, ',', expression, ',', expression, ',', expression =create_makemap();
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173 -> "ARROW", mapping, "TO", mapping =create_line('a');
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174 -> "XTICK", mapping, ',', string expression =create_tick(1);
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175 -> "YTICK", mapping, ',', string expression =create_tick(3);
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176 -> "XTICK", mapping =create_tick(0);
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177 -> "YTICK", mapping =create_tick(2);
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178 -> "CLOSE", "WINDOW" =create_closewin();
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179 -> "CLEAR", "WINDOW" =create_clearwin();
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180 -> "CLEAR", "SCREEN" =create_clearscreen();
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181 -> "OPEN", "PRINTER" =create_openprinter(0);
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182 -> "OPEN", "PRINTER", string expression =create_openprinter(1);
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183 -> "CLOSE", "PRINTER" =create_closeprinter();
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184 -> "WAIT", expression =create_mywait();
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185 -> "BELL" =create_bell();
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186 -> "INKEY" ={create_function(MYINKEY); create_popstrsym(NULL);}
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187 -> "SYSTEM2", '(', string expression, ')' ={create_function(MYSYSTEM2);
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188 create_popdblsym(NULL);}
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189 -> "POKE", string expression, ',', string expression ={create_poke('s');}
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190 -> "POKE", string expression, ',', expression ={create_poke('d');}
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191 -> "END" ={create_myend();}
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192
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193 string_assignment
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194 -> STRSYM:s, '=', string expression ={create_popstrsym(s);}
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195 -> "MID", '(', STRSYM:s, !{
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196 create_pushstrptr(s);},
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197 ',', expression, ',', expression, ')', '=', string expression ={create_changestring(MYMID);}
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198 -> "LEFT", '(', STRSYM:s, !{
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199 create_pushstrptr(s);},
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200 ',', expression, ')', '=', string expression ={create_changestring(MYLEFT);}
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201 -> "RIGHT", '(', STRSYM:s, !{
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202 create_pushstrptr(s);},
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203 ',', expression, ')', '=', string expression ={create_changestring(MYRIGHT);}
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204 -> STRSYM:s, '(', !{
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205 pushcounter();},
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206 indexlist, ')', '=', string expression ={create_doarray(s,ASSIGNSTRINGARRAY);}
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207 -> "MID", '(', STRSYM:s, '(', !{
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208 pushcounter();},
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209 indexlist, ')', !{
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210 create_doarray(s,GETSTRINGPOINTER);},
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211 ',', expression, ',', expression, ')', '=', string expression ={create_changestring(MYMID);}
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212 -> "LEFT", '(', STRSYM:s, '(', !{
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213 pushcounter();},
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214 indexlist, ')', !{
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215 create_doarray(s,GETSTRINGPOINTER);},
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216 ',', expression, ')', '=', string expression ={create_changestring(MYLEFT);}
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217 -> "RIGHT", '(', STRSYM:s, '(', !{
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218 pushcounter();},
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219 indexlist, ')', !{
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220 create_doarray(s,GETSTRINGPOINTER);},
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221 ',', expression, ')', '=', string expression ={create_changestring(MYRIGHT);}
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222
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223 string expression
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224 -> primary string expression
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225 -> string expression, '+', primary string expression ={create_concat();}
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226
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227 primary string expression
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228 -> STRSYM:s ={create_pushstrsym(s);}
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229 -> string_function
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230 -> STRING:s ={if (s==NULL) {error(ERROR,"String not terminated");create_pushstr("");} else {create_pushstr(s);}}
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231 -> STRSYM:s, '(', !{
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232 pushcounter();},
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233 indexlist, ')' ={create_doarray(s,CALLSTRINGARRAY);}
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234 -> '(', string expression, ')'
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235
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236 string_function
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237 -> "LEFT", '(', string expression, ',', expression, ')' ={create_function(MYLEFT);}
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238 -> "RIGHT", '(', string expression, ',', expression, ')' ={create_function(MYRIGHT);}
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239 -> "MID", '(', string expression, ',', expression, ',', expression, ')' ={create_function(MYMID);}
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240 -> "STR", '(', expression, ')' ={create_function(MYSTR);}
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241 -> "STR", '(', expression, ',', string expression, ')' ={create_function(MYSTR2);}
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242 -> "INKEY" ={create_function(MYINKEY);}
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243 -> "CHR", '(', expression, ')' ={create_function(MYCHR);}
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244 -> "UPPER", '(', string expression, ')' ={create_function(MYUPPER);}
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245 -> "LOWER", '(', string expression, ')' ={create_function(MYLOWER);}
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246 -> "LTRIM", '(', string expression, ')' ={create_function(MYLTRIM);}
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247 -> "RTRIM", '(', string expression, ')' ={create_function(MYRTRIM);}
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248 -> "TRIM", '(', string expression, ')' ={create_function(MYTRIM);}
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249 -> "SYSTEM", '(', string expression, ')' ={create_function(MYSYSTEM);}
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250 -> "DATE" ={create_function(MYDATE);}
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251 -> "TIME" ={create_function(MYTIME);}
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252 -> "PEEK2", '(', string expression, ')' ={create_function(MYPEEK2);}
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253
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254 assignment
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255 -> SYMBOL:s, '=', expression ={create_popdblsym(s);}
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256 -> SYMBOL:s, '(', !{
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257 pushcounter();},
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258 indexlist, ')', '=', expression ={create_doarray(s,ASSIGNARRAY);}
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259
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260 primary expression
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261 -> number:n =create_pushdbl(n);
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262 -> function
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263 -> SYMBOL:s =create_pushdblsym(s);
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264 -> SYMBOL:s, '(', !pushcounter();,
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265 indexlist, ')' ={create_doarray(s,CALLARRAY);}
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266 -> '(', expression, ')'
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267 -> '-', primary expression /* 1ef4:fa2arec <֠ */ ={create_negate();}
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268
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269 exponential expression
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270 -> primary expression
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271 -> exponential expression, '^', primary expression ={create_dblbin('^');}
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272
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273 multiplicative expression
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274 -> exponential expression
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275 -> multiplicative expression, '*', exponential expression ={create_dblbin('*');}
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276 -> multiplicative expression, '/', exponential expression ={create_dblbin('/');}
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277
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278 expression
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279 -> multiplicative expression
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280 -> expression, '+', multiplicative expression ={create_dblbin('+');}
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281 -> expression, '-', multiplicative expression ={create_dblbin('-');}
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282
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283 /*
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284 -> expression, '+', expression ={create_dblbin('+');}
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285 -> expression, '-', expression ={create_dblbin('-');}
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286 -> expression, '*', expression ={create_dblbin('*');}
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287 -> expression, '/', expression ={create_dblbin('/');}
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288 -> expression, '^', expression ={create_dblbin('^');}
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289 -> '-', expression /* 1ef4:fa2arec <֠ * / ={create_negate();}
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290 */
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291
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292 mapping
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293 -> expression, ',', expression
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294 -> "MAP", '(', expression, ',', expression, ')' ={create_map();}
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295
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296 function
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297 -> "SIN", '(', expression, ')' ={create_function(MYSIN);}
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298 -> "ASIN", '(', expression, ')' ={create_function(MYASIN);}
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299 -> "COS", '(', expression, ')' ={create_function(MYCOS);}
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300 -> "ACOS", '(', expression, ')' ={create_function(MYACOS);}
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301 -> "TAN", '(', expression, ')' ={create_function(MYTAN);}
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302 -> "ATAN", '(', expression, ')' ={create_function(MYATAN);}
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303 -> "ATAN", '(', expression, ',', expression, ')' ={create_function(MYATAN2);}
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304 -> "EXP", '(', expression, ')' ={create_function(MYEXP);}
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305 -> "LOG", '(', expression, ')' ={create_function(MYLOG);}
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306 -> "SQRT", '(', expression, ')' ={create_function(MYSQRT);}
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307 -> "INT", '(', expression, ')' ={create_function(MYINT);}
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308 -> "FRAC", '(', expression, ')' ={create_function(MYFRAC);}
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309 -> "MOD", '(', expression, ',', expression, ')' ={create_function(MYMOD);}
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310 -> "RAN", '(', expression, ')' ={create_function(MYRAN);}
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311 -> "RAN", '(', ')' ={create_function(MYRAN2);}
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312 -> "MIN", '(', expression, ',', expression, ')' ={create_function(MYMIN);}
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313 -> "MAX", '(', expression, ',', expression, ')' ={create_function(MYMAX);}
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314 -> "XMAP", '(', expression, ')' ={create_function(MYXMAP);}
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315 -> "YMAP", '(', expression, ')' ={create_function(MYYMAP);}
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316 -> "LEN", '(', string expression, ')' ={create_function(MYLEN);}
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317 -> "VAL", '(', string expression, ')' ={create_function(MYVAL);}
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318 -> "ASC", '(', string expression, ')' ={create_function(MYASC);}
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319 -> "INSTR", '(', string expression, ',', string expression, ')' ={create_function(MYINSTR);}
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320 -> "SYSTEM2", '(', string expression, ')' ={create_function(MYSYSTEM2);}
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321 -> "PEEK", '(', string expression, ')' ={create_function(MYPEEK);}
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322
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323 (double) const
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324 -> number:n =n;
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325 -> '+', number:n =n;
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326 -> '-', number:n =-n;
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327
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328 /*
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329 number
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330 -> FNUM ={$$=$1;}
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331 -> DIGITS ={$$=atoi($1);}
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332 */
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333
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334 (int) intnum
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335 -> DIGITS:d =atoi(d);
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336
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337 (char *) symbol_or_lineno
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338 -> DIGITS:s =s;
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339 -> SYMBOL:s =s;
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340
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341 dimlist
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342 -> SYMBOL:s, '(', !{
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343 pushcounter();},
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344 indexlist, ')' ={create_dim(s,'d');}
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345 -> dimlist, ',', SYMBOL:s, '(', !{
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346 pushcounter();},
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347 indexlist, ')' ={create_dim(s,'d');}
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348 -> STRSYM:s, '(', !{
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349 pushcounter();},
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350 indexlist, ')' ={create_dim(s,'s');}
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351 -> dimlist, ',', STRSYM:s, '(', !{
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352 pushcounter();},
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353 indexlist, ')' ={create_dim(s,'s');}
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354
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355 indexlist
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356 -> expression ={inccounter();}
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357 -> indexlist, ',', expression ={inccounter();}
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358
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359 for_loop
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360 -> "FOR", SYMBOL:s, '=', expression, !{
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361 pushname(s);create_popdblsym(s);pushgoto();
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362 create_pushdblsym(s);},
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363 "TO", expression, step_part:p, !{
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364
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365 create_dblrelop((p>0)?'{':'}');
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366 create_decide();
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367 pushlabel();},
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368 /*
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369 SEP, !{
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370 yylineno+=$10;},
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371 */ SEP,
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372 statement list, !{
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373 create_pushdbl(p);
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374 create_pushdblsym(s);
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375 create_dblbin('+');
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376 create_popdblsym(s);
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377 swap();popgoto();poplabel();},
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378 next_or_eofile, next_symbol ={/* cookie*/}
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379
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380 next_or_eofile
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381 -> "NEXT"
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382 -> eof ={end_of_file=TRUE;
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383 error(ERROR,"'next'-statement is missing"); PCB.exit_flag = AG_SYNTAX_ERROR_CODE;}
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384
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385 (double) step_part
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386 -> /* can be omitted */ =1.0;
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387 -> "STEP", const:v =v;
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388
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389 next_symbol
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390 -> /* can be omitted */ ={pop();}
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391 -> SYMBOL:s ={if (strcmp(pop()->pointer,s))
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392 {error(ERROR,"'for' and 'next' do not match"); PCB.exit_flag = AG_SYNTAX_ERROR_CODE;}
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393 }
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394
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395 if_clause
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396 -> "IF", condition, !{
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397 create_decide();pushlabel();},
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398 "THEN", statement list, !{
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399 pushlabel();swap();poplabel();},
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400 else_part, !{
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401 poplabel();},
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402 endif_or_eof
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403
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404 endif_or_eof
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405 -> "ENDIF"
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406 -> eof ={end_of_file=TRUE;
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407 error(ERROR,"'endif'-statement is missing"); PCB.exit_flag = AG_SYNTAX_ERROR_CODE;}
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408 /*
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409 condition
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410 -> '(', condition, ')'
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411 -> condition, "OR", condition ={create_boole('|');}
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412 -> "NOT", condition ={create_boole('!');}
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413 */
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414
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415 condition
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416 -> and condition
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417 -> condition, "OR", and condition ={create_boole('|');}
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418
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419
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420 and condition
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421 -> primary condition
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422 -> and condition, "AND", primary condition ={create_boole('&');}
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423
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424 primary condition
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425 -> comparison
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426 -> '(', condition, ')'
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427 -> "NOT", primary condition
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428
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429 comparison
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430 -> string expression, '=', string expression ={create_strrelop('=');}
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431 -> string expression, "<>", string expression ={create_strrelop('!');}
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432 -> string expression, '<', string expression ={create_strrelop('<');}
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433 -> string expression, "<=", string expression ={create_strrelop('{');}
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434 -> string expression, '>', string expression ={create_strrelop('>');}
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435 -> string expression, ">=", string expression ={create_strrelop('}');}
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436 -> expression, '=', expression ={create_dblrelop('=');}
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437 -> expression, "<>", expression ={create_dblrelop('!');}
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438 -> expression, '<', expression ={create_dblrelop('<');}
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439 -> expression, "<=", expression ={create_dblrelop('{');}
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440 -> expression, '>', expression ={create_dblrelop('>');}
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441 -> expression, ">=", expression ={create_dblrelop('}');}
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442 //-> MYEOF, '(', hashed_number, ')' ={create_testeof($3);}
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443
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444 else_part /* can be omitted */
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445 ->
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446 -> "ELSE", statement list
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447
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448 inputlist
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449 -> input
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450 -> input, ',', inputlist
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451
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452 input
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453 -> SYMBOL:s ={create_myread('d');create_popdblsym(s);}
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454 -> SYMBOL:s, '(', !{
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455 pushcounter();},
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456 indexlist, ')' ={create_myread('d');create_doarray(s,ASSIGNARRAY);}
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457 -> STRSYM:s ={create_myread('s');create_popstrsym(s);}
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458 -> STRSYM:s, '(', !{
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459 pushcounter();},
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460 indexlist, ')' ={create_myread('s');create_doarray(s,ASSIGNSTRINGARRAY);}
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461
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462 readlist
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463 -> readitem
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464 -> readlist, ',', readitem
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465
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466 readitem
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467 -> SYMBOL:s ={create_readdata('d');create_popdblsym(s);}
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468 -> SYMBOL:s, '(', !{
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469 pushcounter();},
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470 indexlist, ')' ={create_readdata('d');create_doarray(s,ASSIGNARRAY);}
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471 -> STRSYM:s ={create_readdata('s');create_popstrsym(s);}
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472 -> STRSYM:s, '(', !{
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473 pushcounter();},
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474 indexlist, ')' ={create_readdata('s');create_doarray(s,ASSIGNSTRINGARRAY);}
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475
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476 datalist
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477 -> STRING:s ={create_strdata(s);}
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478 -> const:v ={create_dbldata(v);}
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479 -> datalist, ',', STRING:s ={create_strdata(s);}
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480 -> datalist, ',', const:v ={create_dbldata(v);}
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481
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482 printlist /* possible empty */
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483 ->
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484 -> expression ={create_print('d');}
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485 -> printlist, ',', expression ={create_print('d');}
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486 -> string expression ={create_print('s');}
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487 -> printlist, ',', string expression ={create_print('s');}
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488
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489 inputintro
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490 -> ={create_myswitch(0);create_readline(NULL);}
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491 -> stream
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492 -> position ={create_myswitch(0);create_readline(NULL);}
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493 -> !{
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494 create_myswitch(0);},
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495 prompt
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496 -> position, !{
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497 create_myswitch(0);},
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498 prompt
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499
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500 printintro
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501 -> /* can be empty */ ={create_myswitch(0);}
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502 -> stream
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503 -> "REVERSE" ={create_revert(TRUE);create_myswitch(0);}
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504 -> position ={create_myswitch(0);}
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505 -> "REVERSE", position ={create_revert(TRUE);create_myswitch(0);}
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506
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507 prompt
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508 -> STRING:s ={create_readline(s);}
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509
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510 position
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511 -> "AT", '(', expression, ',', expression, ')' ={create_mymove();}
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512
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513 stream
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514 -> '#', intnum:n ={create_myswitch(n);}
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515
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516 (int) hashed_number
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517 -> '#', intnum:n =n;
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518 -> intnum:n /* need not contain hash */ =n;
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519
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520 semicolon /* can be left out */
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521 -> ={create_print('n');}
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522 -> ';'
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523
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524 goto_list
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525 -> symbol_or_lineno:s ={create_goto(s);create_findnop();}
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526 -> goto_list, ',', symbol_or_lineno:s ={create_goto(s);create_findnop();}
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527
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528 gosub_list
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529 -> symbol_or_lineno:s ={create_gosub(s);create_findnop();}
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530 -> gosub_list, ',', symbol_or_lineno:s ={create_gosub(s);create_findnop();}
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531
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532 {
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533 #define CHAR_STACK_LENGTH 500
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534
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535 static char charStack[CHAR_STACK_LENGTH+1];
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536 static char *charStackTop = charStack;
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537
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538 /* Define an error record */
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539 typedef struct {
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540 char *message; /* identifies error */
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541 int line; /* location of error */
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542 int column;
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543 } ErrorRecord;
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544
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545 ErrorRecord errorRecord; /* define an error record */
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546
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547 void diagnoseError(char *msg) {
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548 if (parseBasic_pcb.exit_flag == AG_RUNNING_CODE)
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549 parseBasic_pcb.exit_flag = AG_SEMANTIC_ERROR_CODE; /* stop parse */
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550 errorRecord.message = msg;
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551 errorRecord.line = parseBasic_pcb.line;
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552 errorRecord.column = parseBasic_pcb.column;
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553 }
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554
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555 void pushChar(int c) { /* append char to name string */
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556 if (charStackTop < charStack+CHAR_STACK_LENGTH) {
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557 *charStackTop++ = (char) c;
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558 return;
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559 }
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560 /* buffer overflow, kill parse and issue diagnostic */
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561 diagnoseError("Character Stack Overflow");
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562 }
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563
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564 static char *popString(int nChars) { /* get string */
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565 *charStackTop = 0;
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566 return charStackTop -= nChars;
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567 }
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568
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569 FILE *parserInputFile;
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570 void switch_to_my_file(FILE *inputfile) /* switches lex input to given file */
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571 {
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572 parserInputFile = inputfile;
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573 return;
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574 }
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575
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576 #define GET_INPUT ((PCB).input_code = fgetc(parserInputFile))
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577
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578 int yyparse() {
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579 parseBasic();
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580 return !(PCB.exit_flag == AG_SUCCESS_CODE);
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581 }
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582
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583
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584 }