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

# Copyright (c) 2005 - 2019 Detlev Offenbach <detlev@die-offenbachs.de>
#

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


from PyQt5.Qsci import QsciLexerLua

from .Lexer import Lexer
import Preferences


class LexerLua(Lexer, QsciLexerLua):
    """
    Subclass to implement some additional lexer dependant methods.
    """
    def __init__(self, parent=None):
        """
        Constructor
        
        @param parent parent widget of this lexer
        """
        QsciLexerLua.__init__(self, parent)
        Lexer.__init__(self)
        
        self.commentString = "--"
        self.streamCommentString = {
            'start': '--[[ ',
            'end': ' ]]--'
        }
        
        self.keywordSetDescriptions = [
            self.tr("Keywords"),
            self.tr("Basic functions"),
            self.tr("String, (table) & math functions"),
            self.tr("Coroutines, I/O & system facilities"),
            self.tr("User defined 1"),
            self.tr("User defined 2"),
            self.tr("User defined 3"),
            self.tr("User defined 4"),
        ]
    
    def initProperties(self):
        """
        Public slot to initialize the properties.
        """
        self.setFoldCompact(Preferences.getEditor("AllFoldCompact"))
    
    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 [QsciLexerLua.Comment,
                         QsciLexerLua.LineComment]
    
    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 [QsciLexerLua.String,
                         QsciLexerLua.LiteralString,
                         QsciLexerLua.UnclosedString]
    
    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 QsciLexerLua.keywords(self, kwSet)
    
    def maximumKeywordSet(self):
        """
        Public method to get the maximum keyword set.
        
        @return maximum keyword set (integer)
        """
        return 8
