527 lines
24 KiB
Python
527 lines
24 KiB
Python
# -*- coding: utf-8 -*-
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# ------------------------------------------------------------------------------
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# Appy is a framework for building applications in the Python language.
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# Copyright (C) 2007-2011 Gaetan Delannay
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#
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# Distributed under the GNU General Public License.
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#
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# Thanks to Fabio Marcuzzi and Gauthier Bastien for management of strike and
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# underline.
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# ------------------------------------------------------------------------------
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import xml.sax
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from appy.shared.xml_parser import XmlEnvironment, XmlParser
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from appy.pod.odf_parser import OdfEnvironment
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from appy.pod import *
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# To which ODT tags do HTML tags correspond ?
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HTML_2_ODT = {'h1':'h', 'h2':'h', 'h3':'h', 'h4':'h', 'h5':'h', 'h6':'h',
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'p':'p', 'b':'span', 'i':'span', 'strong':'span', 'strike':'span',
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'u':'span', 'em': 'span', 'sub': 'span', 'sup': 'span',
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'br': 'line-break', 'div': 'span'}
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DEFAULT_ODT_STYLES = {'b': 'podBold', 'strong':'podBold', 'i': 'podItalic',
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'u': 'podUnderline', 'strike': 'podStrike',
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'em': 'podItalic', 'sup': 'podSup', 'sub':'podSub',
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'td': 'podCell', 'th': 'podHeaderCell'}
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INNER_TAGS = ('b', 'strong', 'i', 'u', 'em', 'sup', 'sub', 'span', 'div')
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TABLE_CELL_TAGS = ('td', 'th')
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OUTER_TAGS = TABLE_CELL_TAGS + ('li',)
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# The following elements can't be rendered inside paragraphs
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NOT_INSIDE_P = XHTML_HEADINGS + XHTML_LISTS + ('table',)
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NOT_INSIDE_LIST = ('table',)
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IGNORABLE_TAGS = ('meta', 'title', 'style')
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# ------------------------------------------------------------------------------
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class HtmlElement:
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'''Every time an HTML element is encountered during the SAX parsing,
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an instance of this class is pushed on the stack of currently parsed
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elements.'''
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elemTypes = {'p':'para', 'li':'para','ol':'list','ul':'list'}
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odfElems = {'p':'p', 'li':'list-item', 'ol': 'list', 'ul': 'list'}
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def __init__(self, elem, attrs):
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self.elem = elem
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# Keep "class" attribute (useful for finding the corresponding ODT
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# style) in some cases. Normally, basic XmlElement class stores attrs,
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# but for a strange reason those attrs are back to None (probably for
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# performance reasons they become inaccessible after a while).
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self.classAttr = None
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if attrs.has_key('class'):
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self.classAttr = attrs['class']
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self.tagsToReopen = [] # When the HTML element corresponding to self
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# is completely dumped, if there was a problem related to tags
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# inclusion, we may need to dump start tags corresponding to
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# tags that we had to close before dumping this element. This list
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# contains HtmlElement instances.
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self.tagsToClose = [] # Before dumping the closing tag corresponding
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# to self, we may need to close other tags (ie closing a paragraph
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# before closing a cell). This list contains HtmlElement instances.
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self.elemType = self.elem
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if self.elemTypes.has_key(self.elem):
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self.elemType = self.elemTypes[self.elem]
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def getOdfTag(self, env):
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'''Gets the ODF tag that corresponds to me.'''
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return '%s:%s' % (env.textNs, self.odfElems[self.elem])
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def getConflictualElements(self, env):
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'''self was just parsed. In some cases, this element can't be dumped
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in the result because there are conflictual elements among previously
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parsed opening elements (p_currentElements). For example, if we just
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dumped a "p", we can't dump a table within the "p". Such constraints
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do not hold in XHTML code but hold in ODF code.'''
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if env.currentElements:
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parentElem = env.currentElements[-1]
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# Check elements that can't be found within a paragraph
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if (parentElem.elemType=='para') and (self.elem in NOT_INSIDE_P):
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return (parentElem,)
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if (parentElem.elem in OUTER_TAGS) and parentElem.tagsToClose and \
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(parentElem.tagsToClose[-1].elem == 'p') and \
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(self.elem in NOT_INSIDE_P):
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return (parentElem.tagsToClose[-1],)
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# Check elements that can't be found within a list
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if (parentElem.elemType=='list') and (self.elem in NOT_INSIDE_LIST):
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return (parentElem,)
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return ()
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def addInnerParagraph(self, env):
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'''Dump an inner paragraph inside self (if not already done).'''
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if not self.tagsToClose:
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# We did not do it yet
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env.dumpString('<%s:p' % env.textNs)
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if self.elem == 'li':
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itemStyle = env.getCurrentElement(isList=True).elem # ul or ol
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# Which 'li'-related style must I use?
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if self.classAttr:
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odtStyle = env.parser.caller.findStyle(
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self.elem, classValue=self.classAttr)
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if odtStyle and (odtStyle.name == 'podItemKeepWithNext'):
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itemStyle += '_kwn'
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env.dumpString(' %s:style-name="%s"' % (env.textNs,
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env.itemStyles[itemStyle]))
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env.dumpString('>')
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self.tagsToClose.append(HtmlElement('p',{}))
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def dump(self, start, env):
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'''Dumps the start or stop (depending onp_start) tag of this HTML
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element. We must take care of potential innerTags.'''
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# Compute the tag in itself
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tag = ''
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prefix = '<'
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if not start: prefix += '/'
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# Compute tag attributes
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attrs = ''
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if start:
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if self.elemType == 'list':
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# I must specify the list style
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attrs += ' %s:style-name="%s"' % (
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env.textNs, env.listStyles[self.elem])
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if self.elem == 'ol':
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# I have interrupted a numbered list. I need to continue
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# the numbering.
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attrs += ' %s:continue-numbering="true"' % env.textNs
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tag = prefix + self.getOdfTag(env) + attrs + '>'
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# Close/open subTags if any
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for subElem in self.tagsToClose:
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subTag = subElem.dump(start, env)
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if start: tag += subTag
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else: tag = subTag + tag
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return tag
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def __repr__(self):
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return '<Html "%s">' % self.elem
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# ------------------------------------------------------------------------------
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class HtmlTable:
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'''Represents an HTML table, and also a sub-buffer. When parsing elements
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corresponding to an HTML table (<table>, <tr>, <td>, etc), we can't dump
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corresponding ODF elements directly into the global result buffer
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(XhtmlEnvironment.res). Indeed, when dumping an ODF table, we must
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dump columns declarations at the beginning of the table. So before
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dumping rows and cells, we must know how much columns will be present
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in the table. It means that we must first parse the first <tr> entirely
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in order to know how much columns are present in the HTML table before
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dumping the ODF table. So we use this class as a sub-buffer that will
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be constructed as we parse the HTML table; when encountering the end
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of the HTML table, we will dump the result of this sub-buffer into
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the parent buffer, which may be the global buffer or another table
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buffer.'''
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def __init__(self):
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self.res = u'' # The sub-buffer.
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self.tempRes = u'' # The temporary sub-buffer, into which we will
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# dump all table sub-elements, until we encounter the end of the first
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# row. Then, we will know how much columns are defined in the table;
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# we will dump columns declarations into self.res and dump self.tempRes
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# into self.res.
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self.firstRowParsed = False # Was the first table row completely parsed?
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self.nbOfColumns = 0
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# ------------------------------------------------------------------------------
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class XhtmlEnvironment(XmlEnvironment):
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itemStyles = {'ul': 'podBulletItem', 'ol': 'podNumberItem',
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'ul_kwn': 'podBulletItemKeepWithNext',
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'ol_kwn': 'podNumberItemKeepWithNext'}
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listStyles = {'ul': 'podBulletedList', 'ol': 'podNumberedList'}
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def __init__(self, ns):
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XmlEnvironment.__init__(self)
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self.res = u''
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self.currentContent = u''
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self.currentElements = [] # Stack of currently walked elements
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self.currentLists = [] # Stack of currently walked lists (ul or ol)
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self.currentTables = [] # Stack of currently walked tables
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self.creatingRootParagraph = False
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# Within the XHTML chunk given to this parser, there may be some
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# content that is not enclosed within any tag (at "root" level). When I
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# encounter such content, I will include it into a root paragraph with
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# default style. This content may include sub-tags of course (span,
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# div, img, a...) or may already be dumped entirely if I encounter
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# "paragraph-style" sub-tags (h1, h2, p...). self.creatingRootParagraph
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# tells me if I am still in a root paragraph. So when I encounter a
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# "root" content I know if I must reopen a new paragraph or not, for
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# example.
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self.textNs = ns[OdfEnvironment.NS_TEXT]
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self.linkNs = ns[OdfEnvironment.NS_XLINK]
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self.tableNs = ns[OdfEnvironment.NS_TABLE]
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self.ignore = False # Will be True when parsing parts of the XHTML that
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# must be ignored.
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def getCurrentElement(self, isList=False):
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'''Gets the element that is on the top of self.currentElements or
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self.currentLists.'''
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res = None
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if isList:
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elements = self.currentLists # Stack of list elements only
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else:
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elements = self.currentElements # Stack of all elements (including
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# elements also pushed on other stacks, like lists and tables).
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if elements:
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res = elements[-1]
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return res
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def anElementIsMissing(self, previousElem, currentElem):
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res = False
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if previousElem and (previousElem.elem in OUTER_TAGS) and \
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((not currentElem) or (currentElem.elem in INNER_TAGS)):
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res = True
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return res
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def dumpRootParagraph(self, currentElem=None):
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'''Dumps content that is outside any tag (directly within the root
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"podXhtml" tag.'''
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mustStartParagraph = True
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mustEndParagraph = True
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if self.creatingRootParagraph:
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mustStartParagraph = False
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if currentElem and (currentElem not in NOT_INSIDE_P+('p',)):
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mustEndParagraph = False
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if mustStartParagraph and mustEndParagraph and \
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not self.currentContent.strip():
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# In this case I would dump an empty paragraph. So I do nothing.
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return
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if mustStartParagraph:
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self.dumpStyledElement('p', {})
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self.creatingRootParagraph = True
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self.dumpCurrentContent()
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if mustEndParagraph:
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self.dumpString('</%s:p>' % self.textNs)
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self.creatingRootParagraph = False
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def dumpCurrentContent(self):
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'''Dumps content that was temporarily stored in self.currentContent
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into the result.'''
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if self.currentContent.strip():
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# Manage missing elements
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currentElem = self.getCurrentElement()
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if self.anElementIsMissing(currentElem, None):
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currentElem.addInnerParagraph(self)
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# Dump and reinitialize the current content
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for c in self.currentContent.strip('\n'):
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# We remove leading and trailing carriage returns, but not
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# whitespace because whitespace may be part of the text to dump.
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if XML_SPECIAL_CHARS.has_key(c):
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self.dumpString(XML_SPECIAL_CHARS[c])
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else:
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self.dumpString(c)
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self.currentContent = u''
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def dumpStyledElement(self, elem, attrs):
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'''Dumps an element that potentially has associated style
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information.'''
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self.dumpString('<%s:%s' % (self.textNs, HTML_2_ODT[elem]))
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odtStyle = self.parser.caller.findStyle(elem, attrs)
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styleName = None
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if odtStyle:
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styleName = odtStyle.name
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elif DEFAULT_ODT_STYLES.has_key(elem):
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styleName = DEFAULT_ODT_STYLES[elem]
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if styleName:
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self.dumpString(' %s:style-name="%s"' % (self.textNs, styleName))
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if (elem in XHTML_HEADINGS) and (odtStyle.outlineLevel != None):
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self.dumpString(' %s:outline-level="%d"' % (
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self.textNs, odtStyle.outlineLevel))
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self.dumpString('>')
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def dumpTags(self, elems, start=True):
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'''Dumps a series of start or end tags (depending on p_start) of
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HtmlElement instances in p_elems.'''
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tags = ''
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for elem in elems:
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tag = elem.dump(start, self)
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if start: tags += tag
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else: tags = tag + tags
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self.dumpString(tags)
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def dumpString(self, s):
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'''Dumps arbitrary content p_s.
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If the table stack is not empty, we must dump p_s into the buffer
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corresponding to the last parsed table. Else, we must dump p_s
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into the global buffer (self.res).'''
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if self.currentTables:
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currentTable = self.currentTables[-1]
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if (not currentTable.res) or currentTable.firstRowParsed:
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currentTable.res += s
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else:
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currentTable.tempRes += s
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else:
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self.res += s
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def getTagsToReopen(self, conflictElems):
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'''Normally, tags to reopen are equal to p_conflictElems. But we have a
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special case. Indeed, if a conflict elem has itself tagsToClose,
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the last tag to close may not be needed anymore on the tag to
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reopen, so we remove it.'''
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conflictElems[-1].tagsToClose = []
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return conflictElems
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def onElementStart(self, elem, attrs):
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previousElem = self.getCurrentElement()
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if previousElem and (previousElem.elem == 'podxhtml'):
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self.dumpRootParagraph(elem)
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else:
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self.dumpCurrentContent()
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currentElem = HtmlElement(elem, attrs)
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# Manage conflictual elements
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conflictElems = currentElem.getConflictualElements(self)
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if conflictElems:
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# We must close the conflictual elements, and once the currentElem
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# will be dumped, we will re-open the conflictual elements.
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self.dumpTags(conflictElems, start=False)
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currentElem.tagsToReopen = self.getTagsToReopen(conflictElems)
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# Manage missing elements
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if self.anElementIsMissing(previousElem, currentElem):
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previousElem.addInnerParagraph(self)
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# Add the current element on the stack of walked elements
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self.currentElements.append(currentElem)
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if elem in XHTML_LISTS:
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# Update stack of current lists
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self.currentLists.append(currentElem)
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elif elem == 'table':
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# Update stack of current tables
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self.currentTables.append(HtmlTable())
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elif elem in TABLE_CELL_TAGS:
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# If we are in the first row of a table, update columns count
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currentTable = self.currentTables[-1]
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if not currentTable.firstRowParsed:
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nbOfCols = 1
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if attrs.has_key('colspan'):
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nbOfCols = int(attrs['colspan'])
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currentTable.nbOfColumns += nbOfCols
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def onElementEnd(self, elem):
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res = None
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if elem == 'podxhtml':
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self.dumpRootParagraph()
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else:
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self.dumpCurrentContent()
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currentElem = self.currentElements.pop()
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if elem in XHTML_LISTS:
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self.currentLists.pop()
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elif elem == 'table':
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lastTable = self.currentTables.pop()
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# Dumps the content of the last parsed table into the parent buffer
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self.dumpString(lastTable.res)
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elif elem == 'tr':
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lastTable = self.currentTables[-1]
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if not lastTable.firstRowParsed:
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lastTable.firstRowParsed = True
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# First row is parsed. I know the number of columns in the
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# table: I can dump the columns declarations.
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lastTable.res += ('<%s:table-column/>' % self.tableNs) * \
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lastTable.nbOfColumns
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lastTable.res += lastTable.tempRes
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lastTable.tempRes = u''
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if currentElem.tagsToClose:
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self.dumpTags(currentElem.tagsToClose, start=False)
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if currentElem.tagsToReopen:
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res = currentElem.tagsToReopen
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return res
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# ------------------------------------------------------------------------------
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class XhtmlParser(XmlParser):
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def lowerizeInput(self, elem, attrs=None):
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'''Because (X)HTML is case insensitive, we may receive input p_elem and
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p_attrs in lower-, upper- or mixed-case. So here we produce lowercase
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versions that will be used throughout our parser.'''
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resElem = elem.lower()
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resAttrs = attrs
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if attrs:
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resAttrs = {}
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for attrName in attrs.keys():
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resAttrs[attrName.lower()] = attrs[attrName]
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if attrs == None:
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return resElem
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else:
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return resElem, resAttrs
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def startElement(self, elem, attrs):
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elem, attrs = self.lowerizeInput(elem, attrs)
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e = XmlParser.startElement(self, elem, attrs)
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e.onElementStart(elem, attrs)
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if HTML_2_ODT.has_key(elem):
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e.dumpStyledElement(elem, attrs)
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elif elem == 'a':
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e.dumpString('<%s:a %s:type="simple"' % (e.textNs, e.linkNs))
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if attrs.has_key('href'):
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e.dumpString(' %s:href="%s"' % (e.linkNs, attrs['href']))
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e.dumpString('>')
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elif elem in XHTML_LISTS:
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prologue = ''
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if len(e.currentLists) >= 2:
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# It is a list into another list. In this case the inner list
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# must be surrounded by a list-item element.
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prologue = '<%s:list-item>' % e.textNs
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e.dumpString('%s<%s:list %s:style-name="%s">' % (
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prologue, e.textNs, e.textNs, e.listStyles[elem]))
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elif elem == 'li':
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e.dumpString('<%s:list-item>' % e.textNs)
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elif elem == 'table':
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# Here we must call "dumpString" only once
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e.dumpString('<%s:table %s:style-name="podTable">' % (e.tableNs,
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e.tableNs))
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elif elem == 'thead':
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e.dumpString('<%s:table-header-rows>' % e.tableNs)
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elif elem == 'tr':
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e.dumpString('<%s:table-row>' % e.tableNs)
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elif elem in TABLE_CELL_TAGS:
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e.dumpString('<%s:table-cell %s:style-name="%s"' % \
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(e.tableNs, e.tableNs, DEFAULT_ODT_STYLES[elem]))
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if attrs.has_key('colspan'):
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e.dumpString(' %s:number-columns-spanned="%s"' % \
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(e.tableNs, attrs['colspan']))
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e.dumpString('>')
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elif elem in IGNORABLE_TAGS:
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e.ignore = True
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def endElement(self, elem):
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elem = self.lowerizeInput(elem)
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e = XmlParser.endElement(self, elem)
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elemsToReopen = e.onElementEnd(elem)
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if HTML_2_ODT.has_key(elem):
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# For "div" elements, we put append a carriage return.
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if elem == 'div':
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e.dumpString('<%s:line-break/>' % e.textNs)
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e.dumpString('</%s:%s>' % (e.textNs, HTML_2_ODT[elem]))
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elif elem == 'a':
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e.dumpString('</%s:a>' % e.textNs)
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elif elem in XHTML_LISTS:
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epilogue = ''
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if len(e.currentLists) >= 1:
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# We were in an inner list. So we must close the list-item tag
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# that surrounds it.
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epilogue = '</%s:list-item>' % e.textNs
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e.dumpString('</%s:list>%s' % (e.textNs, epilogue))
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elif elem == 'li':
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e.dumpString('</%s:list-item>' % e.textNs)
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elif elem == 'table':
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e.dumpString('</%s:table>' % e.tableNs)
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elif elem == 'thead':
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e.dumpString('</%s:table-header-rows>' % e.tableNs)
|
|
elif elem == 'tr':
|
|
e.dumpString('</%s:table-row>' % e.tableNs)
|
|
elif elem in TABLE_CELL_TAGS:
|
|
e.dumpString('</%s:table-cell>' % e.tableNs)
|
|
elif elem in IGNORABLE_TAGS:
|
|
e.ignore = False
|
|
if elemsToReopen:
|
|
e.dumpTags(elemsToReopen)
|
|
|
|
def characters(self, content):
|
|
e = XmlParser.characters(self, content)
|
|
if not e.ignore:
|
|
e.currentContent += content
|
|
|
|
# -------------------------------------------------------------------------------
|
|
class Xhtml2OdtConverter:
|
|
'''Converts a chunk of XHTML into a chunk of ODT.'''
|
|
def __init__(self, xhtmlString, encoding, stylesManager, localStylesMapping,
|
|
ns):
|
|
self.xhtmlString = xhtmlString
|
|
self.encoding = encoding # Todo: manage encoding that is not utf-8
|
|
self.stylesManager = stylesManager
|
|
self.odtStyles = stylesManager.styles
|
|
self.globalStylesMapping = stylesManager.stylesMapping
|
|
self.localStylesMapping = localStylesMapping
|
|
self.odtChunk = None
|
|
self.xhtmlParser = XhtmlParser(XhtmlEnvironment(ns), self)
|
|
|
|
def run(self):
|
|
self.xhtmlParser.parse(self.xhtmlString)
|
|
return self.xhtmlParser.env.res
|
|
|
|
def findStyle(self, elem, attrs=None, classValue=None):
|
|
'''Finds the ODT style that must be applied to XHTML p_elem that has
|
|
attrs p_attrs. In some cases, p_attrs is not given; the value of the
|
|
"class" attribute is given instead (in p_classValue).
|
|
|
|
Here are the places where we will search, ordered by
|
|
priority (highest first):
|
|
(1) local styles mapping (CSS style in "class" attr)
|
|
(2) " (HTML elem)
|
|
(3) global styles mapping (CSS style in "class" attr)
|
|
(4) " (HTML elem)
|
|
(5) ODT style that has the same name as CSS style in "class" attr
|
|
(6) Prefefined pod-specific ODT style that has the same name as
|
|
CSS style in "class" attr
|
|
(7) ODT style that has the same outline level as HTML elem.'''
|
|
res = None
|
|
cssStyleName = None
|
|
if attrs and attrs.has_key('class'):
|
|
cssStyleName = attrs['class']
|
|
if classValue:
|
|
cssStyleName = classValue
|
|
# (1)
|
|
if self.localStylesMapping.has_key(cssStyleName):
|
|
res = self.localStylesMapping[cssStyleName]
|
|
# (2)
|
|
elif self.localStylesMapping.has_key(elem):
|
|
res = self.localStylesMapping[elem]
|
|
# (3)
|
|
elif self.globalStylesMapping.has_key(cssStyleName):
|
|
res = self.globalStylesMapping[cssStyleName]
|
|
# (4)
|
|
elif self.globalStylesMapping.has_key(elem):
|
|
res = self.globalStylesMapping[elem]
|
|
# (5)
|
|
elif self.odtStyles.has_key(cssStyleName):
|
|
res = self.odtStyles[cssStyleName]
|
|
# (6)
|
|
elif self.stylesManager.podSpecificStyles.has_key(cssStyleName):
|
|
res = self.stylesManager.podSpecificStyles[cssStyleName]
|
|
# (7)
|
|
else:
|
|
# Try to find a style with the correct outline level
|
|
if elem in XHTML_HEADINGS:
|
|
# Is there a delta that must be taken into account ?
|
|
outlineDelta = 0
|
|
if self.localStylesMapping.has_key('h*'):
|
|
outlineDelta += self.localStylesMapping['h*']
|
|
elif self.globalStylesMapping.has_key('h*'):
|
|
outlineDelta += self.globalStylesMapping['h*']
|
|
outlineLevel = int(elem[1]) + outlineDelta
|
|
# Normalize the outline level
|
|
if outlineLevel < 1: outlineLevel = 1
|
|
res = self.odtStyles.getParagraphStyleAtLevel(outlineLevel)
|
|
if res:
|
|
self.stylesManager.checkStylesAdequation(elem, res)
|
|
return res
|
|
# ------------------------------------------------------------------------------
|