appypod-rattail/pod/styles_manager.py

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2009-06-29 07:06:01 -05:00
# ------------------------------------------------------------------------------
# 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 re, os.path
from UserDict import UserDict
import appy.pod
from appy.pod import *
from appy.pod.odf_parser import OdfEnvironment, OdfParser
# Possible states for the parser
READING = 0 # Default state
PARSING_STYLE = 1 # I am parsing styles definitions
# Error-related constants ------------------------------------------------------
MAPPING_NOT_DICT = 'The styles mapping must be a dictionary or a UserDict ' \
'instance.'
MAPPING_ELEM_NOT_STRING = "The styles mapping dictionary's keys and values " \
"must be strings."
MAPPING_OUTLINE_DELTA_NOT_INT = 'When specifying "h*" as key in the styles ' \
'mapping, you must specify an integer as ' \
'value. This integer, which may be positive ' \
'or negative, represents a delta that will ' \
'be added to the html heading\'s outline ' \
'level for finding an ODT style with the ' \
'same outline level.'
MAPPING_ELEM_EMPTY = 'In your styles mapping, you inserted an empty key ' \
'and/or value.'
UNSTYLABLE_TAG = 'You can\'t associate a style to element "%s". Unstylable ' \
'elements are: %s'
STYLE_NOT_FOUND = 'OpenDocument style "%s" was not found in your template. ' \
'Note that the styles names ("Heading 1", "Standard"...) ' \
'that appear when opening your template with OpenOffice, ' \
'for example, are a super-set of the styles that are really '\
'recorded into your document. Indeed, only styles that are ' \
'in use within your template are actually recorded into ' \
'the document. You may consult the list of available ' \
'styles programmatically by calling your pod renderer\'s ' \
'"getStyles" method.'
HTML_PARA_ODT_TEXT = 'For XHTML element "%s", you must associate a ' \
'paragraph-wide OpenDocument style. "%s" is a "text" ' \
'style (that applies to only a chunk of text within a ' \
'paragraph).'
HTML_TEXT_ODT_PARA = 'For XHTML element "%s", you must associate an ' \
'OpenDocument "text" style (that applies to only a chunk '\
'of text within a paragraph). "%s" is a paragraph-wide ' \
'style.'
# ------------------------------------------------------------------------------
class Style:
'''Represents a paragraph style as found in styles.xml in a ODT file.'''
numberRex = re.compile('(\d+)(.*)')
def __init__(self, name, family):
self.name = name
self.family = family # May be 'paragraph', etc.
self.displayName = name
self.styleClass = None # May be 'text', 'list', etc.
self.fontSize = None
self.fontSizeUnit = None # May be pt, %, ...
self.outlineLevel = None # Were the styles lies within styles and
# substyles hierarchy
def setFontSize(self, fontSize):
rexRes = self.numberRex.search(fontSize)
self.fontSize = int(rexRes.group(1))
self.fontSizeUnit = rexRes.group(2)
def __repr__(self):
res = '<Style %s|family %s' % (self.name, self.family)
if self.displayName != None: res += '|displayName "%s"'%self.displayName
if self.styleClass != None: res += '|class %s' % self.styleClass
if self.fontSize != None:
res += '|fontSize %d%s' % (self.fontSize, self.fontSizeUnit)
if self.outlineLevel != None: res += '|level %s' % self.outlineLevel
return ('%s>' % res).encode('utf-8')
# ------------------------------------------------------------------------------
class Styles(UserDict):
def getParagraphStyleAtLevel(self, level):
'''Tries to find a style which has level p_level. Returns None if no
such style exists.'''
res = None
for style in self.itervalues():
if (style.family == 'paragraph') and (style.outlineLevel == level):
res = style
break
return res
def getStyle(self, displayName):
'''Gets the style that has this p_displayName. Returns None if not
found.'''
res = None
for style in self.itervalues():
if style.displayName == displayName:
res = style
break
return res
def getStyles(self, stylesType='all'):
'''Returns a list of all the styles of the given p_stylesType.'''
res = []
if stylesType == 'all':
res = self.values()
else:
for style in self.itervalues():
if (style.family == stylesType) and style.displayName:
res.append(style)
return res
# ------------------------------------------------------------------------------
class StylesEnvironment(OdfEnvironment):
def __init__(self):
OdfEnvironment.__init__(self)
self.styles = Styles()
self.state = READING
self.currentStyle = None # The style definition currently parsed
# ------------------------------------------------------------------------------
class StylesParser(OdfParser):
def __init__(self, env, caller):
OdfParser.__init__(self, env, caller)
self.styleTag = None
def endDocument(self):
e = OdfParser.endDocument(self)
self.caller.styles = e.styles
def startElement(self, elem, attrs):
e = OdfParser.startElement(self, elem, attrs)
self.styleTag = '%s:style' % e.ns(e.NS_STYLE)
if elem == self.styleTag:
e.state = PARSING_STYLE
nameAttr = '%s:name' % e.ns(e.NS_STYLE)
familyAttr = '%s:family' % e.ns(e.NS_STYLE)
classAttr = '%s:class' % e.ns(e.NS_STYLE)
displayNameAttr = '%s:display-name' % e.ns(e.NS_STYLE)
# Create the style
style = Style(name=attrs[nameAttr], family=attrs[familyAttr])
if attrs.has_key(classAttr):
style.styleClass = attrs[classAttr]
if attrs.has_key(displayNameAttr):
style.displayName = attrs[displayNameAttr]
# Record this style in the environment
e.styles[style.name] = style
e.currentStyle = style
levelKey = '%s:default-outline-level' % e.ns(e.NS_STYLE)
if attrs.has_key(levelKey) and attrs[levelKey].strip():
style.outlineLevel = int(attrs[levelKey])
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else:
if e.state == PARSING_STYLE:
# I am parsing tags within the style.
if elem == ('%s:text-properties' % e.ns(e.NS_STYLE)):
fontSizeKey = '%s:font-size' % e.ns(e.NS_FO)
if attrs.has_key(fontSizeKey):
e.currentStyle.setFontSize(attrs[fontSizeKey])
def endElement(self, elem):
e = OdfParser.endElement(self, elem)
if elem == self.styleTag:
e.state = READING
e.currentStyle = None
# -------------------------------------------------------------------------------
class StylesManager:
'''Reads the paragraph styles from styles.xml within an ODT file, and
updates styles.xml with some predefined POD styles.'''
podSpecificStyles = {
'podItemKeepWithNext': Style('podItemKeepWithNext', 'paragraph'),
# This style is common to bullet and number items. Behing the scenes,
# there are 2 concrete ODT styles: podBulletItemKeepWithNext and
# podNumberItemKeepWithNext. pod chooses the right one.
}
def __init__(self, stylesString):
self.stylesString = stylesString
self.styles = None
# Global styles mapping
self.stylesMapping = None
self.stylesParser = StylesParser(StylesEnvironment(), self)
self.stylesParser.parse(self.stylesString)
# Now self.styles contains the styles.
# List of text styles derived from self.styles
self.textStyles = self.styles.getStyles('text')
# List of paragraph styles derived from self.styles
self.paragraphStyles = self.styles.getStyles('paragraph')
def checkStylesAdequation(self, htmlStyle, odtStyle):
'''Checks that p_odtStyle my be used for style p_htmlStyle.'''
if (htmlStyle in XHTML_PARAGRAPH_TAGS_NO_LISTS) and \
(odtStyle in self.textStyles):
raise PodError(
HTML_PARA_ODT_TEXT % (htmlStyle, odtStyle.displayName))
if (htmlStyle in XHTML_INNER_TAGS) and \
(odtStyle in self.paragraphStyles):
raise PodError(HTML_TEXT_ODT_PARA % (
htmlStyle, odtStyle.displayName))
def checkStylesMapping(self, stylesMapping):
'''Checks that the given p_stylesMapping is correct. Returns the same
dict as p_stylesMapping, but with Style instances as values, instead
of strings (style's display names).'''
res = {}
if not isinstance(stylesMapping, dict) and \
not isinstance(stylesMapping, UserDict):
raise PodError(MAPPING_NOT_DICT)
for xhtmlStyleName, odtStyleName in stylesMapping.iteritems():
if not isinstance(xhtmlStyleName, basestring):
raise PodError(MAPPING_ELEM_NOT_STRING)
if (xhtmlStyleName == 'h*') and \
not isinstance(odtStyleName, int):
raise PodError(MAPPING_OUTLINE_DELTA_NOT_INT)
if (xhtmlStyleName != 'h*') and \
not isinstance(odtStyleName, basestring):
raise PodError(MAPPING_ELEM_NOT_STRING)
if (xhtmlStyleName != 'h*') and \
((not xhtmlStyleName) or (not odtStyleName)):
raise PodError(MAPPING_ELEM_EMPTY)
if xhtmlStyleName in XHTML_UNSTYLABLE_TAGS:
raise PodError(UNSTYLABLE_TAG % (xhtmlStyleName,
XHTML_UNSTYLABLE_TAGS))
if xhtmlStyleName != 'h*':
odtStyle = self.styles.getStyle(odtStyleName)
if not odtStyle:
if self.podSpecificStyles.has_key(odtStyleName):
odtStyle = self.podSpecificStyles[odtStyleName]
else:
raise PodError(STYLE_NOT_FOUND % odtStyleName)
self.checkStylesAdequation(xhtmlStyleName, odtStyle)
res[xhtmlStyleName] = odtStyle
else:
res[xhtmlStyleName] = odtStyleName # In this case, it is the
# outline level, not an ODT style name
return res
# ------------------------------------------------------------------------------