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# -*- coding: utf-8 -*-

# Copyright (c) 2003 - 2009 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a SQL lexer with some additional methods.
"""

from PyQt4.Qsci import QsciLexerSQL

from Lexer import Lexer
import Preferences

class LexerSQL(QsciLexerSQL, Lexer):
    """ 
    Subclass to implement some additional lexer dependant methods.
    """
    def __init__(self, parent=None):
        """
        Constructor
        
        @param parent parent widget of this lexer
        """
        QsciLexerSQL.__init__(self, parent)
        Lexer.__init__(self)
    
    def initProperties(self):
        """
        Public slot to initialize the properties.
        """
        self.setFoldComments(Preferences.getEditor("SqlFoldComment"))
        self.setBackslashEscapes(Preferences.getEditor("SqlBackslashEscapes"))
        self.setFoldCompact(Preferences.getEditor("AllFoldCompact"))
    
    def isCommentStyle(self, style):
        """
        Public method to check, if a style is a comment style.
        
        @return flag indicating a comment style (boolean)
        """
        return style in [QsciLexerSQL.Comment, 
                         QsciLexerSQL.CommentDoc, 
                         QsciLexerSQL.CommentLine, 
                         QsciLexerSQL.CommentLineHash]
    
    def isStringStyle(self, style):
        """
        Public method to check, if a style is a string style.
        
        @return flag indicating a string style (boolean)
        """
        return style in [QsciLexerSQL.DoubleQuotedString, 
                         QsciLexerSQL.SingleQuotedString]