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annotate tests/agcl/contrib/parse.syn @ 4:bebb2ba69e1d

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maybe help with getting tex to fail properly on error
author David A. Holland
date Sat, 18 Apr 2020 17:12:17 -0400
parents 13d2b8934445
children
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1 {
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2 /*
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3 * AnaGram, A System for Syntax Directed Programming
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4 * Copyright 1993-1994 Steve Holland. All rights reserved.
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5 * See the file COPYING for license and usage terms.
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6 */
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7 /* Embedded C code */
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8 #include <exec/lists.h>
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9 #include <intuition/classes.h>
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10 #include <proto/intuition.h>
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11 #include "OOLib.h"
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12 #include "Expr.h"
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13 #include "PushString.h"
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14 #include "ClassManager.h"
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15 #include "Driver/VariableClass.h"
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16 #include "Number.h"
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17 #include "Util.h"
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18
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19 struct List ExprList;
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20
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21 #define SYNTAX_ERROR fprintf(stderr,"%s, line %d, column %d\n", (PCB).error_message, (PCB).line, (PCB).column)
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22 #define PARSER_STACK_OVERFLOW {fprintf(stderr, "\nParser stack overflow, line %d, column %d\n", (PCB).line, (PCB).column);}
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23 #define REDUCTION_TOKEN_ERROR {fprintf(stderr, "\nReduction token error, line %d, column %d\n", (PCB).line, (PCB).column);}
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24
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25 Object *VariableProto=NULL; /* remember to initialize this */
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26
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27 void Prepare_parse(void)
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28 {
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29 VariableProto=NewObject(FindOOClass("numberclass"),NULL,NM_ID,VARIABLECLASS_ID,TAG_END);
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30 if (!VariableProto) Warning(183,"Unable to create prototype variable object");
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31 if (!ExprList.lh_Head) NewList(&ExprList);
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32 }
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33
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34 void End_parse(void)
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35 {
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36 if (VariableProto) DisposeObject(VariableProto);
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37 VariableProto=NULL;
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38 }
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39
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40 } /* End of embedded C */
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41 EOL = '\n'+'\r'
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42 DIGIT= '0-9'
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43 ALPHA='a-z'+'A-Z'
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44 GREEK=256..308
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45 RESERVED=','+';'+'='+'('+')'+'<'+'>'+'*'+'/'+'+'+'-'+0
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46 WS=' '+'\t'
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47 WSDISREGARD=WS+'\r'+'\n'
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48 /*ALNUM=ALPHA+DIGIT+GREEK*/
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49 ANYTHING=1..255+GREEK
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50 ALNUM=~(RESERVED+WSDISREGARD)
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51
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52 [
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53 disregard WhiteSpace
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54 lexeme {VariNumStr}
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55 parser stack size = 1000
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56 sticky {StringBody}
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57 ~allow macros
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58 ~case sensitive
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59 escape backslashes
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60 line numbers path = "parse.syn"
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61 line numbers
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62 ]
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63
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64 (void)LineParse $
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65 -> Terminated Line..., 0
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66
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67 Terminated Line
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68 -> Line, ';'
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69
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70 (void)Line
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71 -> "DEFINE",VariNumStr:n,'(',VariableList:List,')',VariableList:LocList,'(',Group,')'
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72 -> "PRINT",VariNumStr:func
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73 -> "VAR", VariableDecl
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74 -> "QUIT" = PCB.exit_flag=AG_SUCCESS_CODE;
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75 -> Comparison = {
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76 Object *Result;
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77 struct ExprNode *Node;
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78 char *String=NULL;
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79 Result=EvalExpr(&ExprList);
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80 if (Result) {
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81 GetAttr(NM_NumberString,Result,(ULONG *)&String);
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82 if (String) printf("%s\n",String);
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83 DisposeObject(Result);
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84 }
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85
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86 while (Node=(struct ExprNode *)RemHead(&ExprList)) {
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87 if (Node->Op != OP_FUNC && Node->Data) DisposeObject(Node->Data);
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88 Free(Node);
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89 }
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90 }
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91
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92 (void)Group
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93 -> Comparisons:a = {ReverseTopExprStack(&ExprList,a);Push(&ExprList,OP_GROUP,a,NULL);}
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94
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95 (struct LocaleNode *)VariableList
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96 -> !{struct Locale *Locale;DoMethod(VariableProto,VCM_NEWLOCALE,&Locale);},VariableListWork = {struct LocaleNode *Locale;DoMethod(VariableProto,VCM_TAKELOCALE,NULL,&Locale);return Locale;}
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97
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98 VariableListWork
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99 ->
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100 -> VariListMemb
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101 -> VariableListWork,',',VariListMemb
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102
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103 VariableDecl
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104 -> VariNumStr:Str ={
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105 if (Str && GetString(Str)) {
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106 NewObject(FindOOClass("numberclass"),NULL,
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107 NM_ID,VARIABLECLASS_ID,
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108 VA_Create,TRUE,
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109 NM_NumberString,GetString(Str),
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110 VA_NoObject,TRUE,
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111 TAG_END);
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112 DeleteString(Str);
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113 }
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114 else ParsePanic(PP_MEM);
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115 }
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116
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117 -> "const",VariNumStr:Str,'=',VariNum:Num ={
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118 Object *Const;
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119 if (Str && GetString(Str)) {
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120 Const=NewObject(FindOOClass("numberclass"),NULL,
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121 NM_ID,VARIABLECLASS_ID,
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122 NM_NumberString,GetString(Str),
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123 VA_Constant,TRUE,
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124 VA_Create,TRUE,
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125 TAG_END);
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126 DeleteString(Str);
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127 if (Const && Num) DoMethod(Const,VCM_ASSIGNFORCE,Num);
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128 if (Const) DisposeObject(Const);
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129 }
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130 else ParsePanic(PP_MEM);
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131 if (Num) DisposeObject(Num);
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132 }
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133
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134
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135 (void)VariListMemb
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136 -> VariNumStr:Str ={
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137 if (Str && GetString(Str)) {
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138 NewObject(FindOOClass("numberclass"),NULL,
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139 NM_ID,VARIABLECLASS_ID,
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140 VA_Create,TRUE,
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141 NM_NumberString,GetString(Str),
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142 VA_NoObject,TRUE,
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143 TAG_END);
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144 DeleteString(Str);
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145 }
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146 else ParsePanic(PP_MEM);
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147 }
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148
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149 -> "var",VariNumStr:Str ={
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150 if (Str && GetString(Str)) {
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151 NewObject(FindOOClass("numberclass"),NULL,
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152 NM_ID,VARIABLECLASS_ID,
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153 NM_NumberString,GetString(Str),
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154 VA_ByReference,TRUE,
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155 VA_Create,TRUE,
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156 VA_NoObject,TRUE,
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157 TAG_END);
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158 DeleteString(Str);
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159 }
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160 else ParsePanic(PP_MEM);
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161 }
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162 -> "const",VariNumStr:Str,VariNum:Num ={
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163 Object *Const;
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164 if (Str && GetString(Str)) {
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165 Const=NewObject(FindOOClass("numberclass"),NULL,
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166 NM_ID,VARIABLECLASS_ID,
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167 NM_NumberString,GetString(Str),
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168 VA_Constant,TRUE,
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169 VA_Create,TRUE,
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170 TAG_END);
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171 if (Const && Num) DoMethod(Const,VCM_ASSIGNFORCE,Num);
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172 if (Const) DisposeObject(Const);
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173 DeleteString(Str);
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174
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175 }
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176 else ParsePanic(PP_MEM);
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177 if (Num) DisposeObject(Num);
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178 }
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179
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180
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181 Comparison
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182 -> Assignment
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183 -> Comparison,'>',Assignment ={ReverseTopExprStack(&ExprList,2);Push(&ExprList,OP_FUNC,2,FUNC_GT);}
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184 -> Comparison,'<',Assignment ={ReverseTopExprStack(&ExprList,2);Push(&ExprList,OP_FUNC,2,FUNC_LT);}
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185 -> Comparison,"==",Assignment ={ReverseTopExprStack(&ExprList,2);Push(&ExprList,OP_FUNC,2,FUNC_COMP);}
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186 -> Comparison,'>','=',Assignment ={ReverseTopExprStack(&ExprList,2);Push(&ExprList,OP_FUNC,2,FUNC_GTEQ);}
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187 -> Comparison,'<','=',Assignment ={ReverseTopExprStack(&ExprList,2);Push(&ExprList,OP_FUNC,2,FUNC_LTEQ);}
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188
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189 (int) Comparisons
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190 -> Comparison =1;
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191 -> Comparison, ';' =1;
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192 -> Comparison, ';',Comparisons:n =n+1;
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193
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194 Assignment
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195 -> Expression
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196 -> VariNum:s,'=',Expression ={Push(&ExprList,OP_ASSIGN,0,s);}
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197
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198 (void)FunctionCall
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199 -> VariNumStr:f,'(',ArgumentList:n,')' = {ReverseTopExprStack(&ExprList,n);Push(&ExprList,OP_FUNC,n,GetString(f));DeleteString(f);}
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200
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201 (void)Expression
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202 -> Product
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203 -> Expression,'+',Product ={ReverseTopExprStack(&ExprList,2);Push(&ExprList,OP_FUNC,2,FUNC_ADD);}
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204 -> Expression,'-',Product ={ReverseTopExprStack(&ExprList,2);Push(&ExprList,OP_FUNC,2,FUNC_SUB);}
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205
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206 (unsigned)ArgumentList
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207 -> =0;
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208 -> Group ={return 1;}
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209 -> Group,',',ArgumentList:a =a+1;
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210
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211 (void)Product
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212 -> PowerFactor
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213 -> Product,'*',Factor = {ReverseTopExprStack(&ExprList,2);Push(&ExprList,OP_FUNC,2,FUNC_MUL);}
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214 -> Product,'/',Factor = {ReverseTopExprStack(&ExprList,2);Push(&ExprList,OP_FUNC,2,FUNC_DIV);}
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215
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216 (void)PowerFactor
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217 -> Factor
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218 -> '-',PowerFactor = Push(&ExprList,OP_FUNC,1,FUNC_OPPOSITE);
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219 -> PowerFactor,'^',Factor ={ReverseTopExprStack(&ExprList,2);Push(&ExprList,OP_FUNC,2,FUNC_POW);}
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220
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221 (void)Factor
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222 -> '(',Group,')'
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223 -> VariNum:Vari = Push(&ExprList,OP_VAR,1,Vari);
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224 -> FunctionCall
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225
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226
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227 (Object *)VariNum
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228 -> VariNumStr:Str ={
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229 Object *Result;
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230 if (Str && GetString(Str)) {
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231 DiscardBlanks(Str);
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232 Result=NewObject(FindOOClass("numberclass"),NULL,
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233 NM_NumberString,GetString(Str),
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234 TAG_END);
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235 DeleteString(Str);
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236 if (Result) return Result;
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237 }
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238 ParsePanic(PP_MEM);
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239 return NULL;
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240 }
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241
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242
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243 (struct String *)VariNumStr
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244 -> StringBody:s = s;
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245
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246 (struct String *) StringBody
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247 -> ALNUM:c ={struct String *String;String=CreateString();StringInsChar(String,strlen(GetString(String)),c);return String;}
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248 -> StringBody:String,ALNUM:c =StringInsChar(String,strlen(GetString(String)),c);
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249 -> StringBody:String,WS:c =StringInsChar(String,strlen(GetString(String)),c);
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250
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251 WhiteSpace
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252 -> WSDISREGARD
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253 -> "/*",ANYTHING...,"*/"
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254