# -*- coding: utf-8 -*- # ------------------------------------------------------------------------------ # Appy is a framework for building applications in the Python language. # Copyright (C) 2007 Gaetan Delannay # This program is free software; you can redistribute it and/or # modify it under the terms of the GNU General Public License # as published by the Free Software Foundation; either version 2 # of the License, or (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,USA. # ------------------------------------------------------------------------------ import xml.sax from appy.shared.xml_parser import XmlEnvironment, XmlParser from appy.pod.odf_parser import OdfEnvironment from appy.pod import * # To which ODT tag does HTML tags correspond ? HTML_2_ODT = {'h1':'h', 'h2':'h', 'h3':'h', 'h4':'h', 'h5':'h', 'h6':'h', 'p':'p', 'b':'span', 'i':'span', 'strong':'span', 'em': 'span', 'sub': 'span', 'sup': 'span', 'br': 'line-break', 'div': 'span'} DEFAULT_ODT_STYLES = {'b': 'podBold', 'strong':'podBold', 'i': 'podItalic', 'em': 'podItalic', 'sup': 'podSup', 'sub':'podSub', 'td': 'podCell', 'th': 'podHeaderCell'} INNER_TAGS = ('b', 'strong', 'i', 'em', 'sup', 'sub', 'span', 'div') TABLE_CELL_TAGS = ('td', 'th') OUTER_TAGS = TABLE_CELL_TAGS + ('li',) NOT_INSIDE_P = XHTML_HEADINGS + XHTML_LISTS + ('table',) # Those elements # can't be rendered inside paragraphs. NOT_INSIDE_LIST = ('table',) IGNORABLE_TAGS = ('meta', 'title', 'style') # ------------------------------------------------------------------------------ class HtmlElement: '''Every time an HTML element is encountered during the SAX parsing, an instance of this class is pushed on the stack of currently parsed elements.''' elemTypes = {'p':'para', 'li':'para','ol':'list','ul':'list'} odfElems = {'p':'p', 'li':'list-item', 'ol': 'list', 'ul': 'list'} def __init__(self, elem, attrs): self.elem = elem # Keep "class" attribute (useful for finding the corresponding ODT # style) in some cases. Normally, basic XmlElement class stores attrs, # but for a strange reason those attrs are back to None (probably for # performance reasons they become inaccessible after a while). self.classAttr = None if attrs.has_key('class'): self.classAttr = attrs['class'] self.tagsToReopen = [] # When the HTML element corresponding to self # is completely dumped, if there was a problem related to tags # inclusion, we may need to dump start tags corresponding to # tags that we had to close before dumping this element. This list # contains HtmlElement instances. self.tagsToClose = [] # Before dumping the closing tag corresponding # to self, we may need to close other tags (ie closing a paragraph # before closing a cell). This list contains HtmlElement instances. self.elemType = self.elem if self.elemTypes.has_key(self.elem): self.elemType = self.elemTypes[self.elem] def getOdfTag(self, env): '''Gets the ODF tag that corresponds to me.''' return '%s:%s' % (env.textNs, self.odfElems[self.elem]) def getConflictualElements(self, env): '''self was just parsed. In some cases, this element can't be dumped in the result because there are conflictual elements among previously parsed opening elements (p_currentElements). For example, if we just dumped a "p", we can't dump a table within the "p". Such constraints do not hold in XHTML code but hold in ODF code.''' if env.currentElements: parentElem = env.currentElements[-1] # Check elements that can't be found within a paragraph if (parentElem.elemType=='para') and (self.elem in NOT_INSIDE_P): return (parentElem,) if (parentElem.elem in OUTER_TAGS) and parentElem.tagsToClose and \ (parentElem.tagsToClose[-1].elem == 'p') and \ (self.elem in NOT_INSIDE_P): return (parentElem.tagsToClose[-1],) # Check elements that can't be found within a list if (parentElem.elemType=='list') and (self.elem in NOT_INSIDE_LIST): return (parentElem,) return () def addInnerParagraph(self, env): '''Dump an inner paragraph inside self (if not already done).''' if not self.tagsToClose: # We did not do it yet env.dumpString('<%s:p' % env.textNs) if self.elem == 'li': itemStyle = env.getCurrentElement(isList=True).elem # ul or ol # Which 'li'-related style must I use? if self.classAttr: odtStyle = env.parser.caller.findStyle( self.elem, classValue=self.classAttr) if odtStyle and (odtStyle.name == 'podItemKeepWithNext'): itemStyle += '_kwn' env.dumpString(' %s:style-name="%s"' % (env.textNs, env.itemStyles[itemStyle])) env.dumpString('>') self.tagsToClose.append(HtmlElement('p',{})) def dump(self, start, env): '''Dumps the start or stop (depending onp_start) tag of this HTML element. We must take care of potential innerTags.''' # Compute the tag in itself tag = '' prefix = '<' if not start: prefix += '/' # Compute tag attributes attrs = '' if start: if self.elemType == 'list': # I must specify the list style attrs += ' %s:style-name="%s"' % ( env.textNs, env.listStyles[self.elem]) if self.elem == 'ol': # I have interrupted a numbered list. I need to continue # the numbering. attrs += ' %s:continue-numbering="true"' % env.textNs tag = prefix + self.getOdfTag(env) + attrs + '>' # Close/open subTags if any for subElem in self.tagsToClose: subTag = subElem.dump(start, env) if start: tag += subTag else: tag = subTag + tag return tag def __repr__(self): return '' % self.elem # ------------------------------------------------------------------------------ class HtmlTable: '''Represents an HTML table, and also a sub-buffer. When parsing elements corresponding to an HTML table (, , entirely in order to know how much columns are present in the HTML table before dumping the ODF table. So we use this class as a sub-buffer that will be constructed as we parse the HTML table; when encountering the end of the HTML table, we will dump the result of this sub-buffer into the parent buffer, which may be the global buffer or another table buffer.''' def __init__(self): self.res = u'' # The sub-buffer. self.tempRes = u'' # The temporary sub-buffer, into which we will # dump all table sub-elements, until we encounter the end of the first # row. Then, we will know how much columns are defined in the table; # we will dump columns declarations into self.res and dump self.tempRes # into self.res. self.firstRowParsed = False # Was the first table row completely parsed? self.nbOfColumns = 0 # ------------------------------------------------------------------------------ class XhtmlEnvironment(XmlEnvironment): itemStyles = {'ul': 'podBulletItem', 'ol': 'podNumberItem', 'ul_kwn': 'podBulletItemKeepWithNext', 'ol_kwn': 'podNumberItemKeepWithNext'} listStyles = {'ul': 'podBulletedList', 'ol': 'podNumberedList'} def __init__(self, ns): XmlEnvironment.__init__(self) self.res = u'' self.currentContent = u'' self.currentElements = [] # Stack of currently walked elements self.currentLists = [] # Stack of currently walked lists (ul or ol) self.currentTables = [] # Stack of currently walked tables self.creatingRootParagraph = False # Within the XHTML chunk given to this parser, there may be some # content that is not enclosed within any tag (at "root" level). When I # encounter such content, I will include it into a root paragraph with # default style. This content may include sub-tags of course (span, # div, img, a...) or may already be dumped entirely if I encounter # "paragraph-style" sub-tags (h1, h2, p...). self.creatingRootParagraph # tells me if I am still in a root paragraph. So when I encounter a # "root" content I know if I must reopen a new paragraph or not, for # example. self.textNs = ns[OdfEnvironment.NS_TEXT] self.linkNs = ns[OdfEnvironment.NS_XLINK] self.tableNs = ns[OdfEnvironment.NS_TABLE] self.ignore = False # Will be True when parsing parts of the XHTML that # must be ignored. def getCurrentElement(self, isList=False): '''Gets the element that is on the top of self.currentElements or self.currentLists.''' res = None if isList: elements = self.currentLists # Stack of list elements only else: elements = self.currentElements # Stack of all elements (including # elements also pushed on other stacks, like lists and tables). if elements: res = elements[-1] return res def anElementIsMissing(self, previousElem, currentElem): res = False if previousElem and (previousElem.elem in OUTER_TAGS) and \ ((not currentElem) or (currentElem.elem in INNER_TAGS)): res = True return res def dumpRootParagraph(self, currentElem=None): '''Dumps content that is outside any tag (directly within the root "podXhtml" tag.''' mustStartParagraph = True mustEndParagraph = True if self.creatingRootParagraph: mustStartParagraph = False if currentElem and (currentElem not in NOT_INSIDE_P+('p',)): mustEndParagraph = False if mustStartParagraph and mustEndParagraph and \ not self.currentContent.strip(): # In this case I would dump an empty paragraph. So I do nothing. return if mustStartParagraph: self.dumpStyledElement('p', {}) self.creatingRootParagraph = True self.dumpCurrentContent() if mustEndParagraph: self.dumpString('' % self.textNs) self.creatingRootParagraph = False def dumpCurrentContent(self): '''Dumps content that was temporarily stored in self.currentContent into the result.''' if self.currentContent.strip(): # Manage missing elements currentElem = self.getCurrentElement() if self.anElementIsMissing(currentElem, None): currentElem.addInnerParagraph(self) # Dump and reinitialize the current content for c in self.currentContent.strip('\n'): # We remove leading and trailing carriage returns, but not # whitespace because whitespace may be part of the text to dump. if XML_SPECIAL_CHARS.has_key(c): self.dumpString(XML_SPECIAL_CHARS[c]) else: self.dumpString(c) self.currentContent = u'' def dumpStyledElement(self, elem, attrs): '''Dumps an element that potentially has associated style information.''' self.dumpString('<%s:%s' % (self.textNs, HTML_2_ODT[elem])) odtStyle = self.parser.caller.findStyle(elem, attrs) styleName = None if odtStyle: styleName = odtStyle.name elif DEFAULT_ODT_STYLES.has_key(elem): styleName = DEFAULT_ODT_STYLES[elem] if styleName: self.dumpString(' %s:style-name="%s"' % (self.textNs, styleName)) if (elem in XHTML_HEADINGS) and (odtStyle.outlineLevel != None): self.dumpString(' %s:outline-level="%d"' % ( self.textNs, odtStyle.outlineLevel)) self.dumpString('>') def dumpTags(self, elems, start=True): '''Dumps a series of start or end tags (depending on p_start) of HtmlElement instances in p_elems.''' tags = '' for elem in elems: tag = elem.dump(start, self) if start: tags += tag else: tags = tag + tags self.dumpString(tags) def dumpString(self, s): '''Dumps arbitrary content p_s. If the table stack is not empty, we must dump p_s into the buffer corresponding to the last parsed table. Else, we must dump p_s into the global buffer (self.res).''' if self.currentTables: currentTable = self.currentTables[-1] if (not currentTable.res) or currentTable.firstRowParsed: currentTable.res += s else: currentTable.tempRes += s else: self.res += s def getTagsToReopen(self, conflictElems): '''Normally, tags to reopen are equal to p_conflictElems. But we have a special case. Indeed, if a conflict elem has itself tagsToClose, the last tag to close may not be needed anymore on the tag to reopen, so we remove it.''' conflictElems[-1].tagsToClose = [] return conflictElems def onElementStart(self, elem, attrs): previousElem = self.getCurrentElement() if previousElem and (previousElem.elem == 'podxhtml'): self.dumpRootParagraph(elem) else: self.dumpCurrentContent() currentElem = HtmlElement(elem, attrs) # Manage conflictual elements conflictElems = currentElem.getConflictualElements(self) if conflictElems: # We must close the conflictual elements, and once the currentElem # will be dumped, we will re-open the conflictual elements. self.dumpTags(conflictElems, start=False) currentElem.tagsToReopen = self.getTagsToReopen(conflictElems) # Manage missing elements if self.anElementIsMissing(previousElem, currentElem): previousElem.addInnerParagraph(self) # Add the current element on the stack of walked elements self.currentElements.append(currentElem) if elem in XHTML_LISTS: # Update stack of current lists self.currentLists.append(currentElem) elif elem == 'table': # Update stack of current tables self.currentTables.append(HtmlTable()) elif elem in TABLE_CELL_TAGS: # If we are in the first row of a table, update columns count currentTable = self.currentTables[-1] if not currentTable.firstRowParsed: nbOfCols = 1 if attrs.has_key('colspan'): nbOfCols = int(attrs['colspan']) currentTable.nbOfColumns += nbOfCols def onElementEnd(self, elem): res = None if elem == 'podxhtml': self.dumpRootParagraph() else: self.dumpCurrentContent() currentElem = self.currentElements.pop() if elem in XHTML_LISTS: self.currentLists.pop() elif elem == 'table': lastTable = self.currentTables.pop() # Dumps the content of the last parsed table into the parent buffer self.dumpString(lastTable.res) elif elem == 'tr': lastTable = self.currentTables[-1] if not lastTable.firstRowParsed: lastTable.firstRowParsed = True # First row is parsed. I know the number of columns in the # table: I can dump the columns declarations. lastTable.res += ('<%s:table-column/>' % self.tableNs) * \ lastTable.nbOfColumns lastTable.res += lastTable.tempRes lastTable.tempRes = u'' if currentElem.tagsToClose: self.dumpTags(currentElem.tagsToClose, start=False) if currentElem.tagsToReopen: res = currentElem.tagsToReopen return res # ------------------------------------------------------------------------------ class XhtmlParser(XmlParser): def lowerizeInput(self, elem, attrs=None): '''Because (X)HTML is case insensitive, we may receive input p_elem and p_attrs in lower-, upper- or mixed-case. So here we produce lowercase versions that will be used throughout our parser.''' resElem = elem.lower() resAttrs = attrs if attrs: resAttrs = {} for attrName in attrs.keys(): resAttrs[attrName.lower()] = attrs[attrName] if attrs == None: return resElem else: return resElem, resAttrs def startElement(self, elem, attrs): elem, attrs = self.lowerizeInput(elem, attrs) e = XmlParser.startElement(self, elem, attrs) e.onElementStart(elem, attrs) if HTML_2_ODT.has_key(elem): e.dumpStyledElement(elem, attrs) elif elem == 'a': e.dumpString('<%s:a %s:type="simple"' % (e.textNs, e.linkNs)) if attrs.has_key('href'): e.dumpString(' %s:href="%s"' % (e.linkNs, attrs['href'])) e.dumpString('>') elif elem in XHTML_LISTS: prologue = '' if len(e.currentLists) >= 2: # It is a list into another list. In this case the inner list # must be surrounded by a list-item element. prologue = '<%s:list-item>' % e.textNs e.dumpString('%s<%s:list %s:style-name="%s">' % ( prologue, e.textNs, e.textNs, e.listStyles[elem])) elif elem == 'li': e.dumpString('<%s:list-item>' % e.textNs) elif elem == 'table': # Here we must call "dumpString" only once e.dumpString('<%s:table %s:style-name="podTable">' % (e.tableNs, e.tableNs)) elif elem == 'thead': 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 %s:style-name="%s"' % \ (e.tableNs, e.tableNs, DEFAULT_ODT_STYLES[elem])) if attrs.has_key('colspan'): e.dumpString(' %s:number-columns-spanned="%s"' % \ (e.tableNs, attrs['colspan'])) e.dumpString('>') elif elem in IGNORABLE_TAGS: e.ignore = True def endElement(self, elem): elem = self.lowerizeInput(elem) e = XmlParser.endElement(self, elem) elemsToReopen = e.onElementEnd(elem) if HTML_2_ODT.has_key(elem): # For "div" elements, we put append a carriage return. if elem == 'div': e.dumpString('<%s:line-break/>' % e.textNs) e.dumpString('' % (e.textNs, HTML_2_ODT[elem])) elif elem == 'a': e.dumpString('' % e.textNs) elif elem in XHTML_LISTS: epilogue = '' if len(e.currentLists) >= 1: # We were in an inner list. So we must close the list-item tag # that surrounds it. epilogue = '' % e.textNs e.dumpString('%s' % (e.textNs, epilogue)) elif elem == 'li': e.dumpString('' % e.textNs) elif elem == 'table': e.dumpString('' % e.tableNs) elif elem == 'thead': e.dumpString('' % e.tableNs) elif elem == 'tr': e.dumpString('' % e.tableNs) elif elem in TABLE_CELL_TAGS: e.dumpString('' % 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 # ------------------------------------------------------------------------------
, etc), we can't dump corresponding ODF elements directly into the global result buffer (XhtmlEnvironment.res). Indeed, when dumping an ODF table, we must dump columns declarations at the beginning of the table. So before dumping rows and cells, we must know how much columns will be present in the table. It means that we must first parse the first