parser.cpp

ICE-3.2 一个开源的中间件

// **********************************************************************
//
// Copyright (c) 2003-2007 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************

#include <IceUtil/DisableWarnings.h>
#include <Parser.h>

#ifdef HAVE_READLINE
#   include <readline/readline.h>
#   include <readline/history.h>
#endif

using namespace std;
using namespace Demo;

extern FILE* yyin;

Parser* parser;

void
Parser::usage()
{
    cout <<
        "help             Print this message.\n"
        "exit, quit       Exit this program.\n"
        "add NAMES...     Create new contacts for NAMES in the phonebook.\n"
        "find NAME        Find all contacts in the phonebook that match NAME.\n"
        "                 Set the current contact to the first one found.\n"
        "next             Set the current contact to the next one that was found.\n"
        "current          Display the current contact.\n"
        "name NAME        Set the name for the current contact to NAME.\n"
        "address ADDRESS  Set the address for the current contact to ADDRESS.\n"
        "phone PHONE      Set the phone number for the current contact to PHONE.\n"
        "remove           Permanently remove the current contact from the phonebook.\n"
        "size SIZE        Set the evictor size for contacts to SIZE.\n"
        "shutdown         Shut the phonebook server down.\n";
}

ParserPtr
Parser::createParser(const PhoneBookPrx& phoneBook)
{
    return new Parser(phoneBook);
}

void
Parser::addContacts(const list<string>& args)
{
    if(args.empty())
    {
        error("`add' requires at least one argument (type `help' for more info)");
        return;
    }

    try
    {
        for(list<string>::const_iterator p = args.begin(); p != args.end(); ++p)
        {
            ContactPrx contact = _phoneBook->createContact();
            contact->setName(*p);
            cout << "added new contact for `" << *p << "'" << endl;
        }
    }
    catch(const DatabaseException& ex)
    {
        error(ex.message);
    }
    catch(const Ice::Exception& ex)
    {
        ostringstream s;
        s << ex;
        error(s.str());
    }
}

void
Parser::findContacts(const list<string>& args)
{
    if(args.size() != 1)
    {
        error("`find' requires exactly one argument (type `help' for more info)");
        return;
    }

    try
    {
        _foundContacts = _phoneBook->findContacts(args.front());
        _current = _foundContacts.begin();
        cout << "number of contacts found: " << _foundContacts.size() << endl;
        printCurrent();
    }
    catch(const DatabaseException& ex)
    {
        error(ex.message);
    }
    catch(const Ice::Exception& ex)
    {
        ostringstream s;
        s << ex;
        error(s.str());
    }
}

void
Parser::nextFoundContact()
{
    if(_current != _foundContacts.end())
    {
        ++_current;
    }
    printCurrent();
}

void
Parser::printCurrent()
{
    try
    {
        if(_current != _foundContacts.end())
        {
            cout << "current contact is:" << endl;
            cout << "name: " << (*_current)->getName() << endl;
            cout << "address: " << (*_current)->getAddress() << endl;
            cout << "phone: " << (*_current)->getPhone() << endl;
        }
        else
        {
            cout << "no current contact" << endl;
        }
    }
    catch(const Ice::ObjectNotExistException&)
    {
        cout << "current contact no longer exists" << endl;
    }
    catch(const DatabaseException& ex)
    {
        error(ex.message);
    }
    catch(const Ice::Exception& ex)
    {
        ostringstream s;
        s << ex;
        error(s.str());
    }
}

void
Parser::setCurrentName(const list<string>& args)
{
    if(args.size() != 1)
    {
        error("`name' requires exactly one argument (type `help' for more info)");
        return;
    }

    try
    {
        if(_current != _foundContacts.end())
        {
            (*_current)->setName(args.front());
            cout << "changed name to `" << args.front() << "'" << endl;
        }
        else
        {
            cout << "no current contact" << endl;
        }
    }
    catch(const Ice::ObjectNotExistException&)
    {
        cout << "current contact no longer exists" << endl;
    }
    catch(const DatabaseException& ex)
    {
        error(ex.message);
    }
    catch(const Ice::Exception& ex)
    {
        ostringstream s;
        s << ex;
        error(s.str());
    }
}

void
Parser::setCurrentAddress(const list<string>& args)
{
    if(args.size() != 1)
    {
        error("`address' requires exactly one argument (type `help' for more info)");
        return;
    }

    try
    {
        if(_current != _foundContacts.end())
        {
            (*_current)->setAddress(args.front());
            cout << "changed address to `" << args.front() << "'" << endl;
        }
        else
        {
            cout << "no current contact" << endl;
        }
    }
    catch(const Ice::ObjectNotExistException&)
    {
        cout << "current contact no longer exists" << endl;
    }
    catch(const DatabaseException& ex)
    {
        error(ex.message);
    }
    catch(const Ice::Exception& ex)
    {
        ostringstream s;
        s << ex;
        error(s.str());
    }
}

void
Parser::setCurrentPhone(const list<string>& args)
{
    if(args.size() != 1)
    {
        error("`phone' requires exactly one argument (type `help' for more info)");
        return;
    }

    try
    {
        if(_current != _foundContacts.end())
        {
            (*_current)->setPhone(args.front());
            cout << "changed phone number to `" << args.front() << "'" << endl;
        }
        else
        {
            cout << "no current contact" << endl;
        }
    }
    catch(const Ice::ObjectNotExistException&)
    {
        cout << "current contact no longer exists" << endl;
    }
    catch(const DatabaseException& ex)
    {
        error(ex.message);
    }
    catch(const Ice::Exception& ex)
    {
        ostringstream s;
        s << ex;
        error(s.str());
    }
}

void
Parser::removeCurrent()
{
    try
    {
        if(_current != _foundContacts.end())
        {
            (*_current)->destroy();
            cout << "removed current contact" << endl;
        }
        else
        {
            cout << "no current contact" << endl;
        }
    }
    catch(const Ice::ObjectNotExistException&)
    {
        cout << "current contact no longer exists" << endl;
    }
    catch(const DatabaseException& ex)
    {
        error(ex.message);
    }
    catch(const Ice::Exception& ex)
    {
        ostringstream s;
        s << ex;
        error(s.str());
    }
}

void
Parser::setEvictorSize(const list<string>& args)
{
    if(args.size() != 1)
    {
        error("`size' requires exactly one argument (type `help' for more info)");
        return;
    }

    try
    {
        _phoneBook->setEvictorSize(atoi(args.front().c_str()));
    }
    catch(const DatabaseException& ex)
    {
        error(ex.message);
    }
    catch(const Ice::Exception& ex)
    {
        ostringstream s;
        s << ex;
        error(s.str());
    }
}

void
Parser::shutdown()
{
    try
    {
        _phoneBook->shutdown();
    }
    catch(const Ice::Exception& ex)
    {
        ostringstream s;
        s << ex;
        error(s.str());
    }
}

void
Parser::getInput(char* buf, int& result, int maxSize)
{
    if(!_commands.empty())
    {
        if(_commands == ";")
        {
            result = 0;
        }
        else
        {
#if defined(_MSC_VER) && !defined(_STLP_MSVC)
            // COMPILERBUG: Stupid Visual C++ defines min and max as macros
            result = _MIN(maxSize, static_cast<int>(_commands.length()));
#else
            result = min(maxSize, static_cast<int>(_commands.length()));
#endif
            strncpy(buf, _commands.c_str(), result);
            _commands.erase(0, result);
            if(_commands.empty())
            {
                _commands = ";";
            }
        }
    }
    else if(isatty(fileno(yyin)))
    {
#ifdef HAVE_READLINE

        const char* prompt = parser->getPrompt();
        char* line = readline(const_cast<char*>(prompt));
        if(!line)
        {
            result = 0;
        }
        else
        {
            if(*line)
            {
                add_history(line);
            }

            result = strlen(line) + 1;
            if(result > maxSize)
            {
                free(line);
                error("input line too long");
                result = 0;
            }
            else
            {
                strcpy(buf, line);
                strcat(buf, "\n");
                free(line);
            }
        }

#else

        cout << parser->getPrompt() << flush;

        string line;
        while(true)
        {
            char c = static_cast<char>(getc(yyin));
            if(c == EOF)
            {
                if(line.size())
                {
                    line += '\n';
                }
                break;
            }

            line += c;

            if(c == '\n')
            {
                break;
            }
        }
        
        result = static_cast<int>(line.length());
        if(result > maxSize)
        {
            error("input line too long");
            buf[0] = EOF;
            result = 1;
        }
        else
        {
            strcpy(buf, line.c_str());
        }

#endif
    }
    else
    {
        if(((result = static_cast<int>(fread(buf, 1, maxSize, yyin))) == 0) && ferror(yyin))
        {
            error("input in flex scanner failed");
            buf[0] = EOF;
            result = 1;
        }
    }
}

void
Parser::nextLine()
{
    _currentLine++;
}

void
Parser::continueLine()
{
    _continue = true;
}

const char*
Parser::getPrompt()
{
    assert(_commands.empty() && isatty(fileno(yyin)));

    if(_continue)
    {
        _continue = false;
        return "(cont) ";
    }
    else
    {
        return ">>> ";
    }
}

void
Parser::error(const char* s)
{
    if(_commands.empty() && !isatty(fileno(yyin)))
    {
        cerr << _currentFile << ':' << _currentLine << ": " << s << endl;
    }
    else
    {
        cerr << "error: " << s << endl;
    }
    _errors++;
}

void
Parser::error(const string& s)
{
    error(s.c_str());
}

void
Parser::warning(const char* s)
{
    if(_commands.empty() && !isatty(fileno(yyin)))
    {
        cerr << _currentFile << ':' << _currentLine << ": warning: " << s << endl;
    }
    else
    {
        cerr << "warning: " << s << endl;
    }
}

void
Parser::warning(const string& s)
{
    warning(s.c_str());
}

int
Parser::parse(FILE* file, bool debug)
{
    extern int yydebug;
    yydebug = debug ? 1 : 0;

    assert(!parser);
    parser = this;

    _errors = 0;
    _commands.empty();
    yyin = file;
    assert(yyin);

    _currentFile = "";
    _currentLine = 0;
    _continue = false;
    nextLine();

    _foundContacts.clear();
    _current = _foundContacts.end();

    int status = yyparse();
    if(_errors)
    {
        status = EXIT_FAILURE;
    }

    parser = 0;
    return status;
}

int
Parser::parse(const string& commands, bool debug)
{
    extern int yydebug;
    yydebug = debug ? 1 : 0;

    assert(!parser);
    parser = this;

    _errors = 0;
    _commands = commands;
    assert(!_commands.empty());
    yyin = 0;

    _currentFile = "<command line>";
    _currentLine = 0;
    _continue = false;
    nextLine();

    _foundContacts.clear();
    _current = _foundContacts.end();

    int status = yyparse();
    if(_errors)
    {
        status = EXIT_FAILURE;
    }

    parser = 0;
    return status;
}

Parser::Parser(const PhoneBookPrx& phoneBook) :
    _phoneBook(phoneBook)
{
}