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