source: trunk/yao/share/antlr-2.7.7/examples/cpp/heteroAST/Main.cpp @ 1

#include <iostream>

#include "CalcLexer.hpp"
#include "CalcParser.hpp"
#include "CalcAST.hpp"

int main()
{
        ANTLR_USING_NAMESPACE(std)
        ANTLR_USING_NAMESPACE(antlr)

        try {
                CalcLexer lexer(cin);
                CalcParser parser(lexer);

                ASTFactory ast_factory;

                parser.initializeASTFactory(ast_factory);
                parser.setASTFactory(&ast_factory);

                // Parse the input expression
                parser.expr();
                RefCalcAST t = RefCalcAST(parser.getAST());

                if( t )
                {
                        // Print the resulting tree out in LISP notation
                        cout << t->toStringTree() << endl;

                        // Compute value and return
                        int r = t->value();
                        cout << "value is " << r << endl;
                }
                else
                        cerr << "Errors encountered during parse.." << endl;
        }
        catch( ANTLRException& e )
        {
                cerr << "ANTLRException: " << e.getMessage() << endl;
                return -1;
        }
        catch(exception& e)
        {
                cerr << "exception: " << e.what() << endl;
                return -1;
        }
        return 0;
}