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

# Copyright (c) 2007 - 2011 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing an exporter for HTML.
"""

# This code is a port of the C++ code found in SciTE 1.74
# Original code: Copyright 1998-2006 by Neil Hodgson <neilh@scintilla.org>

import os

from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.Qsci import QsciScintilla

from KdeQt import KQMessageBox

from ExporterBase import ExporterBase

import Preferences
import Utilities

class ExporterHTML(ExporterBase):
    """
    Class implementing an exporter for HTML.
    """
    def __init__(self, editor, parent = None):
        """
        Constructor
        
        @param editor reference to the editor object (QScintilla.Editor.Editor)
        @param parent parent object of the exporter (QObject)
        """
        ExporterBase.__init__(self, editor, parent)
    
    def exportSource(self):
        """
        Public method performing the export.
        """
        filename = self._getFileName(self.trUtf8("HTML Files (*.html)"))
        if filename.isEmpty():
            return
        else:
            filename = unicode(filename)
        
        try:
            QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
            QApplication.processEvents()
            
            self.editor.recolor(0, -1)
            
            tabSize = Preferences.getEditor("TabWidth")
            if tabSize == 0:
                tabSize = 4
            wysiwyg = Preferences.getEditorExporter("HTML/WYSIWYG")
            folding = Preferences.getEditorExporter("HTML/Folding")
            onlyStylesUsed = Preferences.getEditorExporter("HTML/OnlyStylesUsed")
            titleFullPath = Preferences.getEditorExporter("HTML/FullPathAsTitle")
            tabs = Preferences.getEditorExporter("HTML/UseTabs")
            
            lengthDoc = self.editor.length()
            styleIsUsed = {}
            if onlyStylesUsed:
                for index in range(QsciScintilla.STYLE_MAX + 1):
                    styleIsUsed[index] = False
                # check the used styles
                pos = 0
                while pos < lengthDoc:
                    styleIsUsed[self.editor.styleAt(pos) & 0x7F] = True
                    pos += 1
            else:
                for index in range(QsciScintilla.STYLE_MAX + 1):
                    styleIsUsed[index] = True
            styleIsUsed[QsciScintilla.STYLE_DEFAULT] = True
            
            try:
                f = open(filename, "wb")
                
                f.write(\
                    '''<!DOCTYPE html PUBLIC "-//W3C//DTD'''
                    ''' XHTML 1.0 Transitional//EN"\n''')
                f.write(\
                    ''' "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">\n''')
                f.write('''<html xmlns="http://www.w3.org/1999/xhtml">\n''')
                f.write('''<head>\n''')
                if titleFullPath:
                    f.write('''<title>%s</title>\n''' % self.editor.getFileName())
                else:
                    f.write('''<title>%s</title>\n''' % \
                        os.path.basename(self.editor.getFileName()))
                f.write('''<meta name="Generator" content="eric4" />\n''')
                f.write('''<meta http-equiv="Content-Type" '''
                        '''content="text/html; charset=utf-8" />\n''')
                if folding:
                    f.write('''<script language="JavaScript" type="text/javascript">\n'''
                            '''<!--\n'''
                            '''function symbol(id, sym) {\n'''
                            '''  if (id.textContent == undefined) {\n'''
                            '''    id.innerText = sym;\n'''
                            '''  } else {\n'''
                            '''    id.textContent = sym;\n'''
                            '''  }\n'''
                            '''}\n'''
                            '''function toggle(id) {\n'''
                            '''  var thislayer = document.getElementById('ln' + id);\n'''
                            '''  id -= 1;\n'''
                            '''  var togline = document.getElementById('hd' + id);\n'''
                            '''  var togsym = document.getElementById('bt' + id);\n'''
                            '''  if (thislayer.style.display == 'none') {\n'''
                            '''    thislayer.style.display = 'block';\n'''
                            '''    togline.style.textDecoration = 'none';\n'''
                            '''    symbol(togsym, '- ');\n'''
                            '''  } else {\n'''
                            '''    thislayer.style.display = 'none';\n'''
                            '''    togline.style.textDecoration = 'underline';\n'''
                            '''    symbol(togsym, '+ ');\n'''
                            '''  }\n'''
                            '''}\n'''
                            '''//-->\n'''
                            '''</script>\n'''
                    )
                
                lex = self.editor.getLexer()
                if lex:
                    bgColour = lex.paper(QsciScintilla.STYLE_DEFAULT).name()
                else:
                    bgColour = self.editor.paper().name()
                
                f.write('''<style type="text/css">\n''')
                if lex:
                    istyle = 0
                    while istyle <= QsciScintilla.STYLE_MAX:
                        if (istyle <= QsciScintilla.STYLE_DEFAULT or \
                            istyle > QsciScintilla.STYLE_LASTPREDEFINED) and \
                           styleIsUsed[istyle]:
                            if not lex.description(istyle).isEmpty() or \
                               istyle == QsciScintilla.STYLE_DEFAULT:
                                font = lex.font(istyle)
                                colour = lex.color(istyle)
                                paper = lex.paper(istyle)
                                if istyle == QsciScintilla.STYLE_DEFAULT:
                                    f.write('''span {\n''')
                                else:
                                    f.write('''.S%d {\n''' % istyle)
                                if font.italic():
                                    f.write('''    font-style: italic;\n''')
                                if font.bold():
                                    f.write('''    font-weight: bold;\n''')
                                if wysiwyg:
                                    f.write('''    font-family: '%s';\n''' % \
                                            font.family())
                                f.write('''    color: %s;\n''' % colour.name())
                                if istyle != QsciScintilla.STYLE_DEFAULT and \
                                   bgColour != paper.name():
                                    f.write('''    background: %s;\n''' % paper.name())
                                    f.write('''    text-decoration: inherit;\n''')
                                if wysiwyg:
                                    f.write('''    font-size: %dpt;\n''' % \
                                            QFontInfo(font).pointSize())
                                f.write('''}\n''')
                            else:
                                styleIsUsed[istyle] = False
                        istyle += 1
                else:
                    colour = self.editor.color()
                    paper = self.editor.paper()
                    font = Preferences.getEditorOtherFonts("DefaultFont")
                    f.write('''.S0 {\n''')
                    if font.italic():
                        f.write('''    font-style: italic;\n''')
                    if font.bold():
                        f.write('''    font-weight: bold;\n''')
                    if wysiwyg:
                        f.write('''    font-family: '%s';\n''' % font.family())
                    f.write('''    color: %s;\n''' % colour.name())
                    if bgColour != paper.name():
                        f.write('''    background: %s;\n''' % paper.name())
                        f.write('''    text-decoration: inherit;\n''')
                    if wysiwyg:
                        f.write('''    font-size: %dpt;\n''' % \
                                QFontInfo(font).pointSize())
                    f.write('''}\n''')
                f.write('''</style>\n''')
                f.write('''</head>\n''')
                
                f.write('''<body bgcolor="%s">\n''' % bgColour)
                line = self.editor.lineAt(0)
                level = self.editor.foldLevelAt(line) - QsciScintilla.SC_FOLDLEVELBASE
                levelStack = [level]
                styleCurrent = self.editor.styleAt(0)
                inStyleSpan = False
                inFoldSpan = False
                # Global span for default attributes
                if wysiwyg:
                    f.write('''<span>''')
                else:
                    f.write('''<pre>''')
                
                if folding:
                    if self.editor.foldFlagsAt(line) & \
                       QsciScintilla.SC_FOLDLEVELHEADERFLAG:
                        f.write('''<span id="hd%d" onclick="toggle('%d')">''' % \
                                (line, line + 1))
                        f.write('''<span id="bt%d">- </span>''' % line)
                        inFoldSpan = True
                    else:
                        f.write('''&nbsp; ''')
                
                if styleIsUsed[styleCurrent]:
                    f.write('''<span class="S%0d">''' % styleCurrent)
                    inStyleSpan = True
                
                column = 0
                pos = 0
                utf8 = self.editor.isUtf8()
                utf8Ch = ""
                utf8Len = 0
                
                while pos < lengthDoc:
                    ch = self.editor.rawCharAt(pos)
                    style = self.editor.styleAt(pos)
                    if style != styleCurrent:
                        if inStyleSpan:
                            f.write('''</span>''')
                            inStyleSpan = False
                        if ch not in ['\r', '\n']: # no need of a span for the EOL
                            if styleIsUsed[style]:
                                f.write('''<span class="S%d">''' % style)
                                inStyleSpan = True
                            styleCurrent = style
                    
                    if ch == ' ':
                        if wysiwyg:
                            prevCh = ''
                            if column == 0: 
                                # at start of line, must put a &nbsp; 
                                # because regular space will be collapsed
                                prevCh = ' '
                            while pos < lengthDoc and self.editor.rawCharAt(pos) == ' ':
                                if prevCh != ' ':
                                    f.write(' ')
                                else:
                                    f.write('''&nbsp;''')
                                prevCh = self.editor.rawCharAt(pos)
                                pos += 1
                                column += 1
                            pos -= 1 
                            # the last incrementation will be done by the outer loop
                        else:
                            f.write(' ')
                            column += 1
                    elif ch == '\t':
                        ts = tabSize - (column % tabSize)
                        if wysiwyg:
                            f.write('''&nbsp;''' * ts)
                            column += ts
                        else:
                            if tabs:
                                f.write(ch)
                                column += 1
                            else:
                                f.write(' ' * ts)
                                column += ts
                    elif ch in ['\r', '\n']:
                        if inStyleSpan:
                            f.write('''</span>''')
                            inStyleSpan = False
                        if inFoldSpan:
                            f.write('''</span>''')
                            inFoldSpan = False
                        if ch == '\r' and self.editor.rawCharAt(pos + 1) == '\n':
                            pos += 1 # CR+LF line ending, skip the "extra" EOL char
                        column = 0
                        if wysiwyg:
                            f.write('''<br />''')
                        
                        styleCurrent = self.editor.styleAt(pos + 1)
                        if folding:
                            line = self.editor.lineAt(pos + 1)
                            newLevel = self.editor.foldLevelAt(line)
                            
                            if newLevel < level:
                                while levelStack[-1] > newLevel:
                                    f.write('''</span>''')
                                    levelStack.pop()
                            f.write('\n') # here to get clean code
                            if newLevel > level:
                                f.write('''<span id="ln%d">''' % line)
                                levelStack.append(newLevel)
                            if self.editor.foldFlagsAt(line) & \
                               QsciScintilla.SC_FOLDLEVELHEADERFLAG:
                                f.write('''<span id="hd%d" onclick="toggle('%d')">''' % \
                                        (line, line + 1))
                                f.write('''<span id="bt%d">- </span>''' % line)
                                inFoldSpan = True
                            else:
                                f.write('''&nbsp; ''')
                            level = newLevel
                        else:
                            f.write('\n')
                        
                        if styleIsUsed[styleCurrent] and \
                           self.editor.rawCharAt(pos + 1) not in ['\r', '\n']:
                            # We know it's the correct next style,
                            # but no (empty) span for an empty line
                            f.write('''<span class="S%0d">''' % styleCurrent)
                            inStyleSpan = True
                    else:
                        if ch == '<':
                            f.write('''&lt;''')
                        elif ch == '>':
                            f.write('''&gt''')
                        elif ch == '&':
                            f.write('''&amp;''')
                        else:
                            if ord(ch) > 127 and utf8:
                                utf8Ch += ch
                                if utf8Len == 0:
                                    if (ord(utf8Ch[0]) & 0xF0) == 0xF0:
                                        utf8Len = 4
                                    elif (ord(utf8Ch[0]) & 0xE0) == 0xE0:
                                        utf8Len = 3
                                    elif (ord(utf8Ch[0]) & 0xC0) == 0xC0:
                                        utf8Len = 2
                                    column -= 1 # will be incremented again later
                                elif len(utf8Ch) == utf8Len:
                                    ch = utf8Ch.decode('utf8')
                                    f.write(Utilities.html_encode(ch))
                                    utf8Ch = ""
                                    utf8Len = 0
                                else:
                                    column -= 1 # will be incremented again later
                            else:
                                f.write(ch)
                        column += 1
                    
                    pos += 1
                
                if inStyleSpan:
                    f.write('''</span>''')
                
                if folding:
                    while levelStack:
                        f.write('''</span>''')
                        levelStack.pop()
                
                if wysiwyg:
                    f.write('''</span>''')
                else:
                    f.write('''</pre>''')
                
                f.write('''</body>\n</html>\n''')
                f.close()
            except IOError, err:
                QApplication.restoreOverrideCursor()
                KQMessageBox.critical(self.editor,
                    self.trUtf8("Export source"),
                    self.trUtf8(\
                        """<p>The source could not be exported to <b>%1</b>.</p>"""
                        """<p>Reason: %2</p>""")\
                        .arg(filename).arg(unicode(err)),
                    QMessageBox.StandardButtons(\
                        QMessageBox.Ok))
        finally:
            QApplication.restoreOverrideCursor()
