Revision control
Copy as Markdown
-- Copyright (C) 2016 The Qt Company Ltd.
-- SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
%parser calc_grammar
%decl calc_parser.h
%impl calc_parser.cpp
%token_prefix Token_
%token number
%token lparen
%token rparen
%token plus
%token minus
%start Goal
/:
#ifndef CALC_PARSER_H
#define CALC_PARSER_H
#include "qparser.h"
#include "calc_grammar_p.h"
class CalcParser: public QParser<CalcParser, $table>
{
public:
int nextToken();
void consumeRule(int ruleno);
};
#endif // CALC_PARSER_H
:/
/.
#include "calc_parser.h"
#include <QtDebug>
#include <cstdlib>
void CalcParser::consumeRule(int ruleno)
{
switch (ruleno) {
./
Goal: Expression ;
/.
case $rule_number:
qDebug() << "value:" << sym(1);
break;
./
PrimaryExpression: number ;
PrimaryExpression: lparen Expression rparen ;
/.
case $rule_number:
sym(1) = sym (2);
break;
./
Expression: PrimaryExpression ;
Expression: Expression plus PrimaryExpression;
/.
case $rule_number:
sym(1) += sym (3);
break;
./
Expression: Expression minus PrimaryExpression;
/.
case $rule_number:
sym(1) -= sym (3);
break;
./
/.
} // switch
}
#include <cstdio>
int main()
{
CalcParser p;
if (p.parse())
printf("ok\n");
}
./