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172 lines
3.7 KiB
172 lines
3.7 KiB
%{
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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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/*
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This file must be translated to C and modified to build everywhere.
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Run bison like this:
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bison --yacc --name-prefix=cmExpr_yy --defines=cmExprParserTokens.h -ocmExprParser.cxx cmExprParser.y
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Modify cmExprParser.cxx:
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- "#if 0" out yyerrorlab block in range ["goto yyerrlab1", "yyerrlab1:"]
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*/
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#include "cmConfigure.h" // IWYU pragma: keep
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#include <stdlib.h>
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#include <string.h>
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#include <stdexcept>
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/*-------------------------------------------------------------------------*/
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#define YYDEBUG 1
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#include "cmExprParserHelper.h" /* Interface to parser object. */
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#include "cmExprLexer.h" /* Interface to lexer object. */
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#include "cmExprParserTokens.h" /* Need YYSTYPE for YY_DECL. */
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/* Forward declare the lexer entry point. */
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YY_DECL;
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/* Helper function to forward error callback from parser. */
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static void cmExpr_yyerror(yyscan_t yyscanner, const char* message);
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/* Disable some warnings in the generated code. */
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#ifdef _MSC_VER
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# pragma warning (disable: 4102) /* Unused goto label. */
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# pragma warning (disable: 4065) /* Switch statement contains default but no case. */
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#endif
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#if defined(__GNUC__) && __GNUC__ >= 8
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# pragma GCC diagnostic ignored "-Wconversion"
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#endif
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%}
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/* Generate a reentrant parser object. */
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%define api.pure
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/* Configure the parser to use a lexer object. */
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%lex-param {yyscan_t yyscanner}
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%parse-param {yyscan_t yyscanner}
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%define parse.error verbose
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/*-------------------------------------------------------------------------*/
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/* Tokens */
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%token exp_PLUS
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%token exp_MINUS
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%token exp_TIMES
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%token exp_DIVIDE
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%token exp_MOD
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%token exp_SHIFTLEFT
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%token exp_SHIFTRIGHT
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%token exp_OPENPARENT
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%token exp_CLOSEPARENT
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%token exp_OR;
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%token exp_AND;
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%token exp_XOR;
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%token exp_NOT;
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%token exp_NUMBER;
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/*-------------------------------------------------------------------------*/
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/* grammar */
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%%
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start:
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exp {
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cmExpr_yyget_extra(yyscanner)->SetResult($<Number>1);
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}
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exp:
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bitwiseor {
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$<Number>$ = $<Number>1;
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}
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| exp exp_OR bitwiseor {
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$<Number>$ = $<Number>1 | $<Number>3;
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}
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bitwiseor:
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bitwisexor {
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$<Number>$ = $<Number>1;
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}
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| bitwiseor exp_XOR bitwisexor {
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$<Number>$ = $<Number>1 ^ $<Number>3;
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}
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bitwisexor:
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bitwiseand {
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$<Number>$ = $<Number>1;
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}
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| bitwisexor exp_AND bitwiseand {
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$<Number>$ = $<Number>1 & $<Number>3;
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}
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bitwiseand:
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shift {
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$<Number>$ = $<Number>1;
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}
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| bitwiseand exp_SHIFTLEFT shift {
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$<Number>$ = $<Number>1 << $<Number>3;
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}
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| bitwiseand exp_SHIFTRIGHT shift {
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$<Number>$ = $<Number>1 >> $<Number>3;
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}
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shift:
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term {
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$<Number>$ = $<Number>1;
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}
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| shift exp_PLUS term {
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$<Number>$ = $<Number>1 + $<Number>3;
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}
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| shift exp_MINUS term {
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$<Number>$ = $<Number>1 - $<Number>3;
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}
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term:
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unary {
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$<Number>$ = $<Number>1;
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}
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| term exp_TIMES unary {
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$<Number>$ = $<Number>1 * $<Number>3;
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}
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| term exp_DIVIDE unary {
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if (yyvsp[0].Number == 0) {
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throw std::overflow_error("divide by zero");
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}
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$<Number>$ = $<Number>1 / $<Number>3;
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}
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| term exp_MOD unary {
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$<Number>$ = $<Number>1 % $<Number>3;
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}
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unary:
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factor {
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$<Number>$ = $<Number>1;
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}
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| exp_PLUS unary {
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$<Number>$ = + $<Number>2;
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}
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| exp_MINUS unary {
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$<Number>$ = - $<Number>2;
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}
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factor:
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exp_NUMBER {
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$<Number>$ = $<Number>1;
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}
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| exp_OPENPARENT exp exp_CLOSEPARENT {
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$<Number>$ = $<Number>2;
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}
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;
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%%
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/* End of grammar */
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/*--------------------------------------------------------------------------*/
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void cmExpr_yyerror(yyscan_t yyscanner, const char* message)
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{
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cmExpr_yyget_extra(yyscanner)->Error(message);
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}
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