PStatementDef.hpp

Go to the documentation of this file.

/***************************************************************************
 
  PStatementDef.hpp
 
  Author: Andreas Suter
  e-mail: andreas.suter@psi.ch
 
  Based on Joel de Guzman example on calc7,
  see https://github.com/boostorg/spirit
 
  This file contains the implementation (definition) of the PStatement
  grammar. It defines the grammar rules for parsing variable
  declarations and assignments using Boost.Spirit X3.
 
  The grammar supports:
  - Variable declarations: var <identifier> = <expression>
  - Variable declarations without initialization: var <identifier>
  - Assignments: <identifier> = <expression>
 
  The grammar integrates with PExpression for parsing right-hand side
  expressions and includes error handling and AST annotation.
 
***************************************************************************/
 
/***************************************************************************
 *   Copyright (C) 2023 by Andreas Suter                                   *
 *   andreas.suter@psi.ch                                                  *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
 
#include "PStatement.hpp"
#include "PExpressionDef.hpp"
#include "PErrorHandler.hpp"
#include "PAnnotation.hpp"
 
namespace mupp { namespace parser
{
    namespace x3 = boost::spirit::x3;
    namespace ascii = boost::spirit::x3::ascii;
 
    using x3::raw;
    using x3::lexeme;
    using ascii::alpha;
    using ascii::alnum;

    // Rule definitions
 
    inline statement_list_type const statement_list = "statement_list";
    inline variable_declaration_type const variable_declaration = "variable_declaration";
    inline assignment_type const assignment = "assignment";
    inline stmt_identifier_type const stmt_identifier = "identifier";

    // Grammar
 
    inline auto const statement_list_def =
        +(variable_declaration | assignment)
        ;
 
    inline auto const stmt_identifier_def =
        raw[lexeme[(alpha | '_') >> *(alnum | '_')]]
        ;
 
    inline auto const variable_declaration_def =
        lexeme["var" >> !(alnum | '_')] // make sure we have whole words
        >   stmt_identifier
        >   -('=' > expr)
        ;
 
    inline auto const assignment_def =
        stmt_identifier
        >   '='
        >   expr
        ;
 
    BOOST_SPIRIT_DEFINE(statement_list, variable_declaration, assignment, stmt_identifier)
 
}}