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

# Copyright (c) 2004 - 2020 Detlev Offenbach <detlev@die-offenbachs.de>
#

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


from PyQt5.Qsci import QsciLexerPerl

from .Lexer import Lexer
import Preferences


class LexerPerl(Lexer, QsciLexerPerl):
    """
    Subclass to implement some additional lexer dependant methods.
    """
    def __init__(self, parent=None):
        """
        Constructor
        
        @param parent parent widget of this lexer
        """
        QsciLexerPerl.__init__(self, parent)
        Lexer.__init__(self)
        
        self.commentString = "#"
        
        self.keywordSetDescriptions = [
            self.tr("Keywords"),
        ]
    
    def initProperties(self):
        """
        Public slot to initialize the properties.
        """
        self.setFoldComments(Preferences.getEditor("PerlFoldComment"))
        self.setFoldCompact(Preferences.getEditor("AllFoldCompact"))
        try:
            self.setFoldPackages(Preferences.getEditor("PerlFoldPackages"))
            self.setFoldPODBlocks(Preferences.getEditor("PerlFoldPODBlocks"))
        except AttributeError:
            pass
        try:
            self.setFoldAtElse(Preferences.getEditor("PerlFoldAtElse"))
        except AttributeError:
            pass
    
    def autoCompletionWordSeparators(self):
        """
        Public method to return the list of separators for autocompletion.
        
        @return list of separators (list of strings)
        """
        return ['::', '->']
    
    def isCommentStyle(self, style):
        """
        Public method to check, if a style is a comment style.
        
        @param style style to check (integer)
        @return flag indicating a comment style (boolean)
        """
        return style in [QsciLexerPerl.Comment]
    
    def isStringStyle(self, style):
        """
        Public method to check, if a style is a string style.
        
        @param style style to check (integer)
        @return flag indicating a string style (boolean)
        """
        return style in [QsciLexerPerl.DoubleQuotedHereDocument,
                         QsciLexerPerl.DoubleQuotedString,
                         QsciLexerPerl.QuotedStringQ,
                         QsciLexerPerl.QuotedStringQQ,
                         QsciLexerPerl.QuotedStringQR,
                         QsciLexerPerl.QuotedStringQW,
                         QsciLexerPerl.QuotedStringQX,
                         QsciLexerPerl.SingleQuotedHereDocument,
                         QsciLexerPerl.SingleQuotedString]
    
    def defaultKeywords(self, kwSet):
        """
        Public method to get the default keywords.
        
        @param kwSet number of the keyword set (integer)
        @return string giving the keywords (string) or None
        """
        return QsciLexerPerl.keywords(self, kwSet)
