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# $Id$
# Author: David Goodger, Paul Tremblay, Guenter Milde
# Maintainer: docutils-develop@lists.sourceforge.net
# Copyright: This module has been placed in the public domain.
"""
Simple document tree Writer, writes Docutils XML according to
http://docutils.sourceforge.net/docs/ref/docutils.dtd.
"""
__docformat__ = 'reStructuredText'
import sys
# Work around broken PyXML and obsolete python stdlib behaviour. (The stdlib
# replaces its own xml module with PyXML if the latter is installed. However,
# PyXML is no longer maintained and partially incompatible/buggy.) Reverse
# the order in which xml module and submodules are searched to import stdlib
# modules if they exist and PyXML modules if they do not exist in the stdlib.
#
# See http://sourceforge.net/tracker/index.php?func=detail&aid=3552403&group_id=38414&atid=422030
# and http://lists.fedoraproject.org/pipermail/python-devel/2012-July/000406.html
import xml
if "_xmlplus" in xml.__path__[0]: # PyXML sub-module
xml.__path__.reverse() # If both are available, prefer stdlib over PyXML
import xml.sax.saxutils
from StringIO import StringIO
import docutils
from docutils import frontend, writers, nodes
class RawXmlError(docutils.ApplicationError): pass
class Writer(writers.Writer):
supported = ('xml',)
"""Formats this writer supports."""
settings_spec = (
'"Docutils XML" Writer Options',
None,
(('Generate XML with newlines before and after tags.',
['--newlines'],
{'action': 'store_true', 'validator': frontend.validate_boolean}),
('Generate XML with indents and newlines.',
['--indents'],
{'action': 'store_true', 'validator': frontend.validate_boolean}),
('Omit the XML declaration. Use with caution.',
['--no-xml-declaration'],
{'dest': 'xml_declaration', 'default': 1, 'action': 'store_false',
'validator': frontend.validate_boolean}),
('Omit the DOCTYPE declaration.',
['--no-doctype'],
{'dest': 'doctype_declaration', 'default': 1,
'action': 'store_false', 'validator': frontend.validate_boolean}),))
settings_defaults = {'output_encoding_error_handler': 'xmlcharrefreplace'}
config_section = 'docutils_xml writer'
config_section_dependencies = ('writers',)
output = None
"""Final translated form of `document`."""
def __init__(self):
writers.Writer.__init__(self)
self.translator_class = XMLTranslator
def translate(self):
self.visitor = visitor = self.translator_class(self.document)
self.document.walkabout(visitor)
self.output = ''.join(visitor.output)
class XMLTranslator(nodes.GenericNodeVisitor):
xml_declaration = '<?xml version="1.0" encoding="%s"?>\n'
# TODO: add stylesheet options similar to HTML and LaTeX writers?
#xml_stylesheet = '<?xml-stylesheet type="text/xsl" href="%s"?>\n'
doctype = (
'<!DOCTYPE document PUBLIC'
' "+//IDN docutils.sourceforge.net//DTD Docutils Generic//EN//XML"'
' "http://docutils.sourceforge.net/docs/ref/docutils.dtd">\n')
generator = '<!-- Generated by Docutils %s -->\n'
xmlparser = xml.sax.make_parser()
"""SAX parser instance to check/exctract raw XML."""
xmlparser.setFeature(
"http://xml.org/sax/features/external-general-entities", True)
def __init__(self, document):
nodes.NodeVisitor.__init__(self, document)
# Reporter
self.warn = self.document.reporter.warning
self.error = self.document.reporter.error
# Settings
self.settings = settings = document.settings
self.indent = self.newline = ''
if settings.newlines:
self.newline = '\n'
if settings.indents:
self.newline = '\n'
self.indent = ' '
self.level = 0 # indentation level
self.in_simple = 0 # level of nesting inside mixed-content elements
# Output
self.output = []
if settings.xml_declaration:
self.output.append(
self.xml_declaration % settings.output_encoding)
if settings.doctype_declaration:
self.output.append(self.doctype)
self.output.append(self.generator % docutils.__version__)
# initialize XML parser
self.the_handle=TestXml()
self.xmlparser.setContentHandler(self.the_handle)
# generic visit and depart methods
# --------------------------------
def default_visit(self, node):
"""Default node visit method."""
if not self.in_simple:
self.output.append(self.indent*self.level)
self.output.append(node.starttag(xml.sax.saxutils.quoteattr))
self.level += 1
if isinstance(node, nodes.TextElement):
self.in_simple += 1
if not self.in_simple:
self.output.append(self.newline)
def default_departure(self, node):
"""Default node depart method."""
self.level -= 1
if not self.in_simple:
self.output.append(self.indent*self.level)
self.output.append(node.endtag())
if isinstance(node, nodes.TextElement):
self.in_simple -= 1
if not self.in_simple:
self.output.append(self.newline)
# specific visit and depart methods
# ---------------------------------
def visit_Text(self, node):
text = xml.sax.saxutils.escape(node.astext())
self.output.append(text)
def depart_Text(self, node):
pass
def visit_raw(self, node):
if 'xml' not in node.get('format', '').split():
# skip other raw content?
# raise nodes.SkipNode
self.default_visit(node)
return
# wrap in <raw> element
self.default_visit(node) # or not?
xml_string = node.astext()
self.output.append(xml_string)
self.default_departure(node) # or not?
# Check validity of raw XML:
if isinstance(xml_string, unicode) and sys.version_info < (3,):
xml_string = xml_string.encode('utf8')
try:
self.xmlparser.parse(StringIO(xml_string))
except xml.sax._exceptions.SAXParseException, error:
col_num = self.the_handle.locator.getColumnNumber()
line_num = self.the_handle.locator.getLineNumber()
srcline = node.line
if not isinstance(node.parent, nodes.TextElement):
srcline += 2 # directive content start line
msg = 'Invalid raw XML in column %d, line offset %d:\n%s' % (
col_num, line_num, node.astext())
self.warn(msg, source=node.source, line=srcline+line_num-1)
raise nodes.SkipNode # content already processed
class TestXml(xml.sax.ContentHandler):
def setDocumentLocator(self, locator):
self.locator = locator
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