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

#include <iostream>

#include "DemoJavaLexer.hpp"
#include "DemoJavaDocLexer.hpp"
#include "DemoJavaParser.hpp"
#include "antlr/TokenStreamSelector.hpp"

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

        // Define a selector that can switch from java to javadoc
        TokenStreamSelector selector;

        try {
                // attach java lexer to the input stream, which also creates a shared input state object
                DemoJavaLexer main(cin);
                main.setSelector(&selector);

                // create javadoc lexer; attach to same shared input state as java lexer
                DemoJavaDocLexer doclexer(main.getInputState());
                doclexer.setSelector(&selector);

                // notify selector about various lexers; name them for convenient reference later
                selector.addInputStream(&main, "main");
                selector.addInputStream(&doclexer, "doclexer");
                selector.select("main"); // start with main java lexer

                // Create parser attached to selector
                DemoJavaParser parser(selector);

                // Pull in one or more int decls with optional javadoc
                parser.input();

                // spin thru all tokens generated via the SELECTOR.
                RefToken t;
                while ( (t=selector.nextToken())->getType()!=Token::EOF_TYPE ) {
                        cout << t->toString() << endl;
                }
        }
        catch( ANTLRException& e )
        {
                cerr << "exception: " << e.getMessage() << endl;
                return -1;
        }
        catch( exception& e )
        {
                cerr << "exception: " << e.what() << endl;
                return -1;
        }
        return 0;
}