// This defines the interface to the QsciLexerVHDL class.
//
// Copyright (c) 2007
// 	Riverbank Computing Limited <info@riverbankcomputing.co.uk>
// 
// This file is part of QScintilla.
// 
// This copy of QScintilla is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2, or (at your option) any
// later version.
// 
// QScintilla is supplied in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
// details.
// 
// You should have received a copy of the GNU General Public License along with
// QScintilla; see the file LICENSE.  If not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.


#ifndef QSCILEXERVHDL_H
#define QSCILEXERVHDL_H


#include <qobject.h>

#include <Qsci/qsciglobal.h>
#include <Qsci/qscilexer.h>


//! \brief The QsciLexerVHDL class encapsulates the Scintilla VHDL lexer.
class QSCINTILLA_EXPORT QsciLexerVHDL : public QsciLexer
{
    Q_OBJECT

public:
    //! This enum defines the meanings of the different styles used by the
    //! VHDL lexer.
    enum {
        //! The default.
        Default = 0,

        //! A comment.
        Comment = 1,

        //! A comment line.
        CommentLine = 2,

        //! A number.
        Number = 3,

        //! A string.
        String = 4,

        //! An operator.
        Operator = 5,

        //! An identifier
        Identifier = 6,

        //! The end of a line where a string is not closed.
        UnclosedString = 7,

        //! A keyword.
        Keyword = 8,

        //! A standard operator.
        StandardOperator = 9,

        //! An attribute.
        Attribute = 10,

        //! A standard function.
        StandardFunction = 11,

        //! A standard package.
        StandardPackage = 12,

        //! A standard type.
        StandardType = 13,

        //! A keyword defined in keyword set number 7.  The class must be
        //! sub-classed and re-implement keywords() to make use of this style.
        KeywordSet7 = 14
    };

    //! Construct a QsciLexerVHDL with parent \a parent and name \a name.  \a
    //! parent is typically the QsciScintilla instance.
    QsciLexerVHDL(QObject *parent = 0, const char *name = 0);

    //! Destroys the QsciLexerVHDL instance.
    virtual ~QsciLexerVHDL();

    //! Returns the name of the language.
    const char *language() const;

    //! Returns the name of the lexer.  Some lexers support a number of
    //! languages.
    const char *lexer() const;

    //! \internal Returns the style used for braces for brace matching.
    int braceStyle() const;

    //! Returns the foreground colour of the text for style number \a style.
    //!
    //! \sa defaultPaper()
    QColor defaultColor(int style) const;

    //! Returns the end-of-line fill for style number \a style.
    bool defaultEolFill(int style) const;

    //! Returns the font for style number \a style.
    QFont defaultFont(int style) const;

    //! Returns the background colour of the text for style number \a style.
    //!
    //! \sa defaultColor()
    QColor defaultPaper(int style) const;

    //! Returns the set of keywords for the keyword set \a set recognised
    //! by the lexer as a space separated string.
    const char *keywords(int set) const;

    //! Returns the descriptive name for style number \a style.  If the
    //! style is invalid for this language then an empty QString is returned.
    //! This is intended to be used in user preference dialogs.
    QString description(int style) const;

    //! Causes all properties to be refreshed by emitting the propertyChanged()
    //! signal as required.
    void refreshProperties();

    //! Returns true if multi-line comment blocks can be folded.
    //!
    //! \sa setFoldComments()
    bool foldComments() const;

    //! Returns true if trailing blank lines are included in a fold block.
    //!
    //! \sa setFoldCompact()
    bool foldCompact() const;

    //! Returns true if else blocks can be folded.
    //!
    //! \sa setFoldAtElse()
    bool foldAtElse() const;

    //! Returns true if begin blocks can be folded.
    //!
    //! \sa setFoldAtBegin()
    bool foldAtBegin() const;

    //! Returns true if blocks can be folded at a parenthesis.
    //!
    //! \sa setFoldAtParenthesis()
    bool foldAtParenthesis() const;

public slots:
    //! If \a fold is true then multi-line comment blocks can be folded.
    //! The default is true.
    //!
    //! \sa foldComments()
    virtual void setFoldComments(bool fold);

    //! If \a fold is true then trailing blank lines are included in a fold
    //! block. The default is true.
    //!
    //! \sa foldCompact()
    virtual void setFoldCompact(bool fold);

    //! If \a fold is true then else blocks can be folded.  The default is
    //! true.
    //!
    //! \sa foldAtElse()
    virtual void setFoldAtElse(bool fold);

    //! If \a fold is true then begin blocks can be folded.  The default is
    //! true.
    //!
    //! \sa foldAtBegin()
    virtual void setFoldAtBegin(bool fold);

    //! If \a fold is true then blocks can be folded at a parenthesis.  The
    //! default is true.
    //!
    //! \sa foldAtParenthesis()
    virtual void setFoldAtParenthesis(bool fold);

protected:
    //! The lexer's properties are read from the settings \a qs.  \a prefix
    //! (which has a trailing '/') should be used as a prefix to the key of
    //! each setting.  true is returned if there is no error.
    //!
    bool readProperties(QSettings &qs,const QString &prefix);

    //! The lexer's properties are written to the settings \a qs.
    //! \a prefix (which has a trailing '/') should be used as a prefix to
    //! the key of each setting.  true is returned if there is no error.
    //!
    bool writeProperties(QSettings &qs,const QString &prefix) const;

private:
    void setCommentProp();
    void setCompactProp();
    void setAtElseProp();
    void setAtBeginProp();
    void setAtParenthProp();

    bool fold_comments;
    bool fold_compact;
    bool fold_atelse;
    bool fold_atbegin;
    bool fold_atparenth;

    QsciLexerVHDL(const QsciLexerVHDL &);
    QsciLexerVHDL &operator=(const QsciLexerVHDL &);
};

#endif