WhileStatement.cpp

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// ------------------------------------------------------------------------
// $RCSfile: WhileStatement.cpp,v $
// ------------------------------------------------------------------------
// $Revision: 1.1.1.1 $
// ------------------------------------------------------------------------
// Copyright: see Copyright.readme
// ------------------------------------------------------------------------
//
// Class: WhileStatement
//   Representation for OPAL WHILE statement.
//
// ------------------------------------------------------------------------
//
// $Date: 2000/03/27 09:33:43 $
// $Author: Andreas Adelmann $
//
// ------------------------------------------------------------------------
 
#include "OpalParser/WhileStatement.h"
 
#include "AbstractObjects/Attribute.h"
#include "AbstractObjects/OpalData.h"
#include "Attributes/Attributes.h"
#include "OpalParser/CompoundStatement.h"
#include "OpalParser/Parser.h"
#include "OpalParser/Token.h"
#include "OpalParser/TokenStream.h"
#include "Utilities/ParseError.h"
 
#include "Utility/IpplInfo.h"
 
// class WhileStatement
//   Statement of the form "WHILE ( <condition> ) <statement>".
// ------------------------------------------------------------------------
 
WhileStatement::WhileStatement(const Parser& parser, TokenStream& is)
    : Statement("", 0), while_block(0) {
    Token key   = is.readToken();
    Token token = is.readToken();
 
    if (key.isKey("WHILE") && token.isDel('(')) {
        int level = 1;
        append(token);
        token = is.readToken();
 
        while (!token.isEOF()) {
            append(token);
 
            if (token.isDel('(')) {
                level++;
            } else if (token.isDel(')')) {
                level--;
                if (level == 0)
                    break;
            }
 
            token = is.readToken();
        }
 
        while_block = parser.readStatement(&is);
    } else {
        throw ParseError("WhileStatement::WhileStatement()", "Invalid \"WHILE\" statement.");
    }
}
 
WhileStatement::~WhileStatement() {
    delete while_block;
}
 
#include "Utilities/OpalException.h"
void WhileStatement::execute(const Parser& parser) {
    curr                = tokens.begin();
    keep                = ++curr;
    Attribute condition = Attributes::makeBool("WHILE()", "while condition");
 
    try {
        condition.parse(*this, false);
        OpalData::getInstance()->update();
 
        while (Attributes::getBool(condition)) {
            while_block->execute(parser);
            OpalData::getInstance()->update();
        }
    } catch (...) {
        std::ostringstream oss;
        this->print(oss);
        *ippl::Error << "Invalid WHILE condition '" + oss.str() + "'";
        throw;
    }
}