fetchtr.cpp

Linux下的基于X11的图形开发环境。

static int yyTok;

static bool match( int t )
{
    bool matches = ( yyTok == t );
    if ( matches )
	yyTok = getToken();
    return matches;
}

static bool matchString( QCString *s )
{
    bool matches = ( yyTok == Tok_String );
    *s = "";
    while ( yyTok == Tok_String ) {
	*s += yyString;
	yyTok = getToken();
    }
    return matches;
}

static bool matchEncoding( bool *utf8 )
{
    if ( yyTok == Tok_Ident ) {
	if ( strcmp(yyIdent, "QApplication") == 0 ) {
	    yyTok = getToken();
	    if ( yyTok == Tok_Gulbrandsen )
		yyTok = getToken();
	}
	*utf8 = QString( yyIdent ).endsWith( QString("UTF8") );
	yyTok = getToken();
	return TRUE;
    } else {
	return FALSE;
    }
}

static void parse( MetaTranslator *tor, const char *initialContext,
		   const char *defaultContext )
{
    QMap<QCString, QCString> qualifiedContexts;
    QStringList namespaces;
    QCString context;
    QCString text;
    QCString com;
    QCString functionContext = initialContext;
    QCString prefix;
    bool utf8 = FALSE;
    bool missing_Q_OBJECT = FALSE;

    yyTok = getToken();
    while ( yyTok != Tok_Eof ) {
	switch ( yyTok ) {
	case Tok_class:
	    /*
	      Partial support for inlined functions.
	    */
	    yyTok = getToken();
	    if ( yyBraceDepth == (int) namespaces.count() &&
		 yyParenDepth == 0 ) {
		do {
		    /*
		      This code should execute only once, but we play
		      safe with impure definitions such as
		      'class Q_EXPORT QMessageBox', in which case
		      'QMessageBox' is the class name, not 'Q_EXPORT'.
		    */
		    functionContext = yyIdent;
		    yyTok = getToken();
		} while ( yyTok == Tok_Ident );

		while ( yyTok == Tok_Gulbrandsen ) {
		    yyTok = getToken();
		    functionContext += "::";
		    functionContext += yyIdent;
		    yyTok = getToken();
		}

		if ( yyTok == Tok_Colon ) {
		    missing_Q_OBJECT = TRUE;
		} else {
		    functionContext = defaultContext;
		}
	    }
	    break;
	case Tok_namespace:
	    yyTok = getToken();
	    if ( yyTok == Tok_Ident ) {
		QCString ns = yyIdent;
		yyTok = getToken();
		if ( yyTok == Tok_LeftBrace &&
		     yyBraceDepth == (int) namespaces.count() + 1 )
		    namespaces.append( QString(ns) );
	    }
	    break;
	case Tok_tr:
	case Tok_trUtf8:
	    utf8 = ( yyTok == Tok_trUtf8 );
	    yyTok = getToken();
	    if ( match(Tok_LeftParen) && matchString(&text) ) {
		com = "";
		if ( match(Tok_RightParen) || (match(Tok_Comma) &&
			matchString(&com) && match(Tok_RightParen)) ) {
		    if ( prefix.isNull() ) {
			context = functionContext;
			if ( !namespaces.isEmpty() )
			    context.prepend( (namespaces.join(QString("::")) +
					      QString("::")).latin1() );
		    } else {
			context = prefix;
		    }
		    prefix = (const char *) 0;

		    if ( qualifiedContexts.contains(context) )
			context = qualifiedContexts[context];
		    tor->insert( MetaTranslatorMessage(context, text, com,
						       QString::null, utf8) );

		    if ( lacks_Q_OBJECT.contains(context) ) {
			qWarning( "%s:%d: Class '%s' lacks Q_OBJECT macro",
				  (const char *) yyFileName, yyLineNo,
				  (const char *) context );
			lacks_Q_OBJECT.remove( context );
		    } else {
			needs_Q_OBJECT.insert( context, 0 );
		    }
		}
	    }
	    break;
	case Tok_translate:
	    utf8 = FALSE;
	    yyTok = getToken();
	    if ( match(Tok_LeftParen) &&
		 matchString(&context) &&
		 match(Tok_Comma) &&
		 matchString(&text) ) {
		com = "";
		if ( match(Tok_RightParen) ||
		     (match(Tok_Comma) &&
		      matchString(&com) &&
		      (match(Tok_RightParen) ||
		       match(Tok_Comma) &&
		       matchEncoding(&utf8) &&
		       match(Tok_RightParen))) )
		    tor->insert( MetaTranslatorMessage(context, text, com,
						       QString::null, utf8) );
	    }
	    break;
	case Tok_Q_OBJECT:
	    missing_Q_OBJECT = FALSE;
	    yyTok = getToken();
	    break;
	case Tok_Ident:
	    if ( !prefix.isNull() )
		prefix += "::";
	    prefix += yyIdent;
	    yyTok = getToken();
	    if ( yyTok != Tok_Gulbrandsen )
		prefix = (const char *) 0;
	    break;
	case Tok_Comment:
	    com = yyComment;
	    com = com.simplifyWhiteSpace();
	    if ( com.left(sizeof(MagicComment) - 1) == MagicComment ) {
		com.remove( 0, sizeof(MagicComment) - 1 );
		int k = com.find( ' ' );
		if ( k == -1 ) {
		    context = com;
		} else {
		    context = com.left( k );
		    com.remove( 0, k + 1 );
		    tor->insert( MetaTranslatorMessage(context, "", com,
						       QString::null, FALSE) );
		}

		/*
		  Provide a backdoor for people using "using
		  namespace". See the manual for details.
		*/
		k = 0;
		while ( (k = context.find("::", k)) != -1 ) {
		    qualifiedContexts.insert( context.mid(k + 2), context );
		    k++;
		}
	    }
	    yyTok = getToken();
	    break;
	case Tok_Arrow:
	    yyTok = getToken();
	    if ( yyTok == Tok_tr || yyTok == Tok_trUtf8 )
		qWarning( "%s:%d: Cannot invoke tr() like this",
			  (const char *) yyFileName, yyLineNo );
	    break;
	case Tok_Gulbrandsen:
	    // at top level?
	    if ( yyBraceDepth == (int) namespaces.count() && yyParenDepth == 0 )
		functionContext = prefix;
	    yyTok = getToken();
	    break;
	case Tok_RightBrace:
	case Tok_Semicolon:
	    if ( yyBraceDepth >= 0 &&
		 yyBraceDepth + 1 == (int) namespaces.count() )
		namespaces.remove( namespaces.fromLast() );
	    if ( yyBraceDepth == (int) namespaces.count() ) {
		if ( missing_Q_OBJECT ) {
		    if ( needs_Q_OBJECT.contains(functionContext) ) {
			qWarning( "%s:%d: Class '%s' lacks Q_OBJECT macro",
				  (const char *) yyFileName, yyLineNo,
				  (const char *) functionContext );
		    } else {
			lacks_Q_OBJECT.insert( functionContext, 0 );
		    }
		}
		functionContext = defaultContext;
		missing_Q_OBJECT = FALSE;
	    }
	    yyTok = getToken();
	    break;
	default:
	    yyTok = getToken();
	}
    }

    if ( yyBraceDepth != 0 )
	fprintf( stderr,
		 "%s: Unbalanced braces in C++ code (or abuse of the C++"
		  " preprocessor)\n",
		  (const char *) yyFileName );
    if ( yyParenDepth != 0 )
	fprintf( stderr,
		 "%s: Unbalanced parentheses in C++ code (or abuse of the C++"
		 " preprocessor)\n",
		 (const char *) yyFileName );
}

void fetchtr_cpp( const char *fileName, MetaTranslator *tor,
		  const char *defaultContext, bool mustExist )
{
    yyInFile = fopen( fileName, "r" );
    if ( yyInFile == 0 ) {
	if ( mustExist )
	    fprintf( stderr,
		     "lupdate error: Cannot open C++ source file '%s': %s\n",
		     fileName, strerror(errno) );
	return;
    }

    startTokenizer( fileName, getCharFromFile );
    parse( tor, 0, defaultContext );
    fclose( yyInFile );
}

/*
  In addition to C++, we support Qt Designer UI files.
*/

/*
  Fetches tr() calls in C++ code in UI files (inside "<function>"
  tag). This mechanism is obsolete.
*/
void fetchtr_inlined_cpp( const char *fileName, const QString& in,
			  MetaTranslator *tor, const char *context )
{
    yyInStr = in;
    startTokenizer( fileName, getCharFromString );
    parse( tor, context, 0 );
    yyInStr = QString::null;
}

class UiHandler : public QXmlDefaultHandler
{
public:
    UiHandler( MetaTranslator *translator, const char *fileName )
	: tor( translator ), fname( fileName ), comment( "" ) { }

    virtual bool startElement( const QString& namespaceURI,
			       const QString& localName, const QString& qName,
			       const QXmlAttributes& atts );
    virtual bool endElement( const QString& namespaceURI,
			     const QString& localName, const QString& qName );
    virtual bool characters( const QString& ch );
    virtual bool fatalError( const QXmlParseException& exception );

private:
    void flush();

    MetaTranslator *tor;
    QCString fname;
    QString context;
    QString source;
    QString comment;

    QString accum;
};

bool UiHandler::startElement( const QString& /* namespaceURI */,
			      const QString& /* localName */,
			      const QString& qName,
			      const QXmlAttributes& atts )
{
    if ( qName == QString("item") ) {
	flush();
	if ( !atts.value(QString("text")).isEmpty() )
	    source = atts.value( QString("text") );
    } else if ( qName == QString("string") ) {
	flush();
    }
    accum.truncate( 0 );
    return TRUE;
}

bool UiHandler::endElement( const QString& /* namespaceURI */,
			    const QString& /* localName */,
			    const QString& qName )
{
    accum.replace( QRegExp(QString("\r\n")), "\n" );

    if ( qName == QString("class") ) {
	if ( context.isEmpty() )
	    context = accum;
    } else if ( qName == QString("string") ) {
	source = accum;
    } else if ( qName == QString("comment") ) {
	comment = accum;
	flush();
    } else if ( qName == QString("function") ) {
	fetchtr_inlined_cpp( (const char *) fname, accum, tor,
			     context.latin1() );
    } else {
	flush();
    }
    return TRUE;
}

bool UiHandler::characters( const QString& ch )
{
    accum += ch;
    return TRUE;
}

bool UiHandler::fatalError( const QXmlParseException& exception )
{
    QString msg;
    msg.sprintf( "Parse error at line %d, column %d (%s).",
		 exception.lineNumber(), exception.columnNumber(),
		 exception.message().latin1() );
    fprintf( stderr, "XML error: %s\n", msg.latin1() );
    return FALSE;
}

void UiHandler::flush()
{
    if ( !context.isEmpty() && !source.isEmpty() )
	tor->insert( MetaTranslatorMessage(context.utf8(), source.utf8(),
					   comment.utf8(), QString::null,
					   TRUE) );
    source.truncate( 0 );
    comment.truncate( 0 );
}

void fetchtr_ui( const char *fileName, MetaTranslator *tor,
		 const char * /* defaultContext */, bool mustExist )
{
    QFile f( fileName );
    if ( !f.open(IO_ReadOnly) ) {
	if ( mustExist )
	    fprintf( stderr, "lupdate error: cannot open UI file '%s': %s\n",
		     fileName, strerror(errno) );
	return;
    }

    QTextStream t( &f );
    QXmlInputSource in( t );
    QXmlSimpleReader reader;
    reader.setFeature( "http://xml.org/sax/features/namespaces", FALSE );
    reader.setFeature( "http://xml.org/sax/features/namespace-prefixes", TRUE );
    reader.setFeature( "http://trolltech.com/xml/features/report-whitespace"
		       "-only-CharData", FALSE );
    QXmlDefaultHandler *hand = new UiHandler( tor, fileName );
    reader.setContentHandler( hand );
    reader.setErrorHandler( hand );

    if ( !reader.parse(in) )
	fprintf( stderr, "%s: Parse error in UI file\n", fileName );
    reader.setContentHandler( 0 );
    reader.setErrorHandler( 0 );
    delete hand;
    f.close();
}