source: trunk/yao/share/antlr-2.7.7/examples/cpp/flexLexer/Main.cpp

#include <iostream>
#include <fstream>

#include "LexTokenStream.hpp"
#include "JavaRecognizer.hpp"
#include "JavaTreeParser.hpp"

ANTLR_USING_NAMESPACE(std)
ANTLR_USING_NAMESPACE(antlr)

static void parseFile(const string& f);
static void doTreeAction(const string& f, RefAST t, ASTFactory* factory);

int main(int argc,char* argv[])
{
        // Use a try/catch block for parser exceptions
        try {
                // if we have at least one command-line argument
                if ( argc > 1 )
                {
                        cerr << "Parsing..." << endl;

                        // for each file specified on the command line
                        for( int i = 1; i < argc; i++ )
                        {
                                cerr << "   " << argv[i] << endl;
                                parseFile(argv[i]);
                        }
                }
                else
                {
                        cerr << "Usage: " << argv[0]
                                  << " <file name(s)>" << endl;
                }
        }
        catch( ANTLRException& e )
        {
                cerr << "exception: " << e.getMessage() << endl;
                return -1;
        }
        catch( exception& e )
        {
                cerr << "exception: " << e.what() << endl;
                return -1;
        }
        return 0;
}

// Here's where we do the real work...
static void parseFile(const string& f)
{
        try {
                FILE* fp = fopen(f.c_str(),"r");

                // Create a scanner that reads from the input stream
                LexTokenStream lexer(fp);

                // Create a parser that reads from the scanner
                JavaRecognizer parser(lexer);

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

                // start parsing at the compilationUnit rule
                parser.compilationUnit();

                fclose(fp);

                // do something with the tree
                doTreeAction( f, parser.getAST(), &ast_factory );
        }
        catch (exception& e) {
                cerr << "parser exception: " << e.what() << endl;
        }
}

static void doTreeAction(const string&, RefAST t, ASTFactory* factory )
{
        if ( t==nullAST )
                return;

        JavaTreeParser tparse;
        tparse.initializeASTFactory(*factory);
        tparse.setASTFactory(factory);

        try {
                tparse.compilationUnit(t);
                // System.out.println("successful walk of result AST for "+f);
        }
        catch (RecognitionException& e) {
                cerr << e.getMessage() << endl;
        }
}