/usr/share/pyshared/kid/serialization.py is in python-kid 0.9.6-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"""Infoset serialization formats (XML, XHTML, HTML, etc)"""
__revision__ = "$Rev: 492 $"
__date__ = "$Date: 2007-07-06 21:38:45 -0400 (Fri, 06 Jul 2007) $"
__author__ = "Ryan Tomayko (rtomayko@gmail.com)"
__copyright__ = "Copyright 2004-2005, Ryan Tomayko"
__license__ = "MIT <http://www.opensource.org/licenses/mit-license.php>"
import htmlentitydefs
try:
set
except NameError: # fallback for Python 2.3
from sets import Set as set
from kid.element import Element, Comment, ProcessingInstruction, \
Fragment, QName, namespaces, encode_entity, raise_serialization_error
import kid.namespace as namespace
from kid.parser import START, END, TEXT, COMMENT, PI, _coalesce
from kid.format import Format, output_formats
__all__ = ['doctypes', 'Serializer', 'XMLSerializer', 'HTMLSerializer']
# bring in well known namespaces
xml_uri = namespace.xml.uri
xhtml_uri = namespace.xhtml.uri
# This is the default entity map:
default_entity_map = {}
for k, v in htmlentitydefs.codepoint2name.items():
default_entity_map[unichr(k)] = "&%s;" % v
# Some common doctypes.
# You can pass doctype strings from here or doctype tuples to Serializers.
doctypes = {
'wml': ('wml', "-//WAPFORUM//DTD WML 1.1//EN",
"http://www.wapforum.org/DTD/wml_1.1.xml"),
'xhtml-strict': ('html', "-//W3C//DTD XHTML 1.0 Strict//EN",
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"),
'xhtml': ('html', "-//W3C//DTD XHTML 1.0 Transitional//EN",
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"),
'xhtml-frameset': ('html', "-//W3C//DTD XHTML 1.0 Frameset//EN",
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd"),
'html-strict': ('HTML', "-//W3C//DTD HTML 4.01//EN",
"http://www.w3.org/TR/html4/strict.dtd"),
'html': ('HTML', "-//W3C//DTD HTML 4.01 Transitional//EN",
"http://www.w3.org/TR/html4/loose.dtd"),
'html-frameset': ('HTML', "-//W3C//DTD HTML 4.01 Frameset//EN",
"http://www.w3.org/TR/html4/frameset.dtd"),
'html-quirks': ('HTML', '-//W3C//DTD HTML 4.01 Transitional//EN'),
'html-frameset-quirks': ('HTML', "-//W3C//DTD HTML 4.01 Frameset//EN")
}
class Serializer(object):
namespaces = namespace.namespaces
src_encoding = encoding = 'utf-8'
format = output_formats['default']
formatted = False
inline = False
def __init__(self, encoding=None, src_encoding=None,
formatted=None, inline=None, format=None):
"""Initialize Serializer.
You can change the following parameters:
encoding: the output encoding
src_encoding: the source encoding
formatted: whether all tags should be considered formatted
inline: whether all tags should be considered inline
format: format to be applied (string or instance of Format)
"""
if encoding is not None:
self.encoding = encoding
if src_encoding is not None:
self.src_encoding = src_encoding
if formatted is not None:
self.formatted = formatted
if inline is not None:
self.inline = inline
if format is not None:
self.format = format
self.format = self._get_format(format)
def _get_format(self, format):
if format is None:
return self.format
elif isinstance(format, basestring):
return output_formats[format]
else:
return format
def is_formatted(self, tagname):
return self.formatted
def is_inline(self, tagname):
return self.inline
def serialize(self, stream, encoding=None,
fragment=False, format=None):
try:
text = ''.join(self.generate(stream, encoding, fragment, format))
except TypeError: # workaround for bug 905389 in Python < 2.5
text = ''.join(tuple(
self.generate(stream, encoding, fragment, format)))
if not fragment:
text = Format.strip(text)
return text
def write(self, stream, file, encoding=None,
fragment=False, format=None):
needs_closed = False
if not hasattr(file, 'write'):
needs_closed = True
file = open(file, 'wb')
try:
write = file.write
for text in self.generate(stream, encoding, fragment, format):
write(text)
finally:
# only close a file if it was opened locally
if needs_closed:
file.close()
def generate(self, stream, encoding=None,
fragment=False, format=None):
pass
def apply_filters(self, stream, format=None):
stream = _coalesce(stream, self.src_encoding)
if format:
stream = self.format_stream(stream, format)
return stream
def format_stream(self, stream, format):
"""Apply format to stream.
Note that this method is unaware of the serialization of the tags
and does only take into account the text inside the stream. So the
results may sometimes differ from what you expect when formatting
the complete serialized output.
"""
filter_text = format.filter
indent, wrap = format.indent, format.wrap
if indent is not None:
indent_lines = format.indent_lines
lstrip_blanks = format.lstrip_blanks
rstrip_blanks = format.rstrip_blanks
lstrip_lines = format.lstrip_lines
min_level, max_level = format.min_level, format.max_level
indent_level = []
new_line = False
if wrap is not None:
wrap_lines = format.wrap_lines
indent_width, new_offset = format.indent_width, format.new_offset
offset = 0
formatted = 0
text = last_char = ''
for ev, item in stream:
if ev == TEXT:
text += item
else:
if ev in (START, END):
tag = item.tag
if not formatted:
text = filter_text(text, last_char)
if indent is None:
if wrap is not None:
text = wrap_lines(text, wrap, offset)
else:
level = len(indent_level)
if max_level and level > max_level:
level = max_level
if min_level:
level -= min_level
if level < 0:
level = 0
if wrap is not None:
text = wrap_lines(text, wrap, offset,
indent_width(level*indent))
if '\n' in text and indent_level:
indent_level[-1] = True
if new_line:
if lstrip_blanks(text)[:1] != '\n':
text = '\n' + lstrip_blanks(text)
offset = 0
new_line = False
if tag == Comment or not self.is_inline(tag):
if ev == START:
if indent_level:
if rstrip_blanks(text)[-1:] != '\n':
text = rstrip_blanks(text) + '\n'
text = indent_lines(text, level*indent)
indent_level[-1] = True
elif text:
text = lstrip_lines(text)
if tag != Comment \
and not self.is_formatted(tag):
indent_level.append(False)
else:
if indent_level:
if indent_level.pop():
if rstrip_blanks(text)[-1:] == '\n':
text = rstrip_blanks(text)[:-1]
text = indent_lines(text,
level*indent)
text = rstrip_blanks(text) + '\n'
level = len(indent_level)
if max_level and level > max_level:
level = max_level
if min_level:
level -= min_level
if level < 0:
level = 0
text += level*indent
elif text:
text = lstrip_lines(text)
new_line = True
elif text:
text = indent_lines(text, level*indent)
if tag == Comment or self.is_formatted(tag):
if ev == START:
formatted += 1
elif formatted:
formatted -= 1
new_line = True
yield TEXT, text
if wrap is not None:
offset = new_offset(text, offset)
last_char = text[-1:]
text = ''
yield ev, item
if text:
if not formatted:
text = filter_text(text, last_char)
if wrap is not None:
text = wrap_lines(text, wrap, offset)
if indent is None:
if wrap is not None:
text = wrap_lines(text, wrap, offset)
else:
level = len(indent_level)
if max_level and level > max_level:
level = max_level
if min_level:
level -= min_level
if level < 0:
level = 0
if wrap is not None:
text = wrap_lines(text, wrap, offset,
indent_width(level*indent))
if rstrip_blanks(text)[-1:] == '\n':
text = text[:-1]
text = indent_lines(text, level*indent)
yield TEXT, text
class XMLSerializer(Serializer):
decl = True
doctype = None
entity_map = None
def __init__(self, encoding=None,
decl=None, doctype=None, entity_map=None, namespaces=None,
formatted=None, inline=None, format=None):
"""Initialize XMLSerializer.
You can change the following parameters:
encoding: the output encoding
decl: add xml declaration at the beginning (True/False)
doctype: add doctype (None, string, tuple)
entity_map: use named entities for output (True/False or mapping)
namespaces: mapping of namespaces
formatted: whether all tags should be considered formatted
inline: whether all tags should be considered inline
format: format to be applied (string or instance of Format)
"""
Serializer.__init__(self, encoding=encoding,
format=format, formatted=formatted, inline=inline)
if decl is not None:
self.decl = decl
if doctype is not None:
self.doctype = doctype
if entity_map is not None:
self.entity_map = entity_map
if namespaces is not None:
self.namespaces = namespaces
def can_be_empty_element(self, item_name):
return True
def generate(self, stream, encoding=None,
fragment=False, format=None):
"""Serializes an event stream to bytes of the specified encoding.
This function yields an encoded string over and over until the
stream is exhausted.
"""
decl = self.decl
doctype = self.doctype
encoding = encoding or self.encoding or 'utf-8'
entity_map = self.entity_map
format = self._get_format(format)
if format:
if format.decl is not None:
decl = format.decl
if format.doctype is not None:
doctype = format.doctype
if format.entity_map is not None:
entity_map = format.entity_map
if entity_map == True:
# if True, use default HTML entity map
entity_map = default_entity_map
elif entity_map == False:
entity_map = None
if isinstance(doctype, basestring):
# allow doctype strings
doctype = doctypes[self.doctype]
escape_cdata = XMLSerializer.escape_cdata
escape_attrib = XMLSerializer.escape_attrib
lastev = None
stream = iter(stream)
names = NamespaceStack(self.namespaces)
if not fragment:
if decl:
yield '<?xml version="1.0" encoding="%s"?>\n' % encoding
if doctype is not None:
yield serialize_doctype(doctype) + '\n'
text = None
for ev, item in self.apply_filters(stream, format):
if ev in (START, END) and item.tag == Fragment:
continue
elif ev == TEXT:
if text is not None:
text = u''.join([text, item])
else:
text = item
continue
if lastev == START:
if ev == END and (not text or not (Format.strip(text)
or self.is_formatted(item.tag))) \
and self.can_be_empty_element(item.tag):
yield ' />'
lastev = END
text = None
names.pop()
continue
yield ">"
if text:
yield escape_cdata(text, encoding, entity_map)
text = None
if ev == START:
if item.tag == Comment:
yield "<!--%s-->" % item.text.encode(encoding)
lastev = COMMENT
continue
elif item.tag == ProcessingInstruction:
yield "<?%s?>" % item.text.encode(encoding)
lastev = PI
continue
else:
current_names = names.current
names.push(namespaces(item, remove=True))
qname = names.qname(item.tag, default=True)
yield "<" + qname.encode(encoding)
for k, v in item.attrib.items():
k = names.qname(k, default=False).encode(encoding)
v = escape_attrib(v, encoding)
yield ' %s="%s"' % (k, v)
for prefix, uri in names.current.items():
if prefix not in current_names \
or current_names[prefix] != uri:
v = escape_attrib(uri, encoding)
if prefix:
k = 'xmlns:' + prefix.encode(encoding)
else:
k = 'xmlns'
yield ' %s="%s"' % (k, v)
elif ev == END and item.tag not in (
Comment, ProcessingInstruction):
qname = names.qname(item.tag, default=True)
yield "</%s>" % qname.encode(encoding)
names.pop()
lastev = ev
if fragment and text:
yield escape_cdata(text, encoding, entity_map)
return
def escape_cdata(text, encoding=None, entity_map=None):
"""Escape character data."""
try:
if encoding:
try:
text = text.encode(encoding)
except UnicodeError:
return encode_entity(text, entities=entity_map)
text = text.replace("&", "&")
text = text.replace("<", "<")
except (TypeError, AttributeError):
raise_serialization_error(text)
return text
escape_cdata = staticmethod(escape_cdata)
def escape_attrib(text, encoding=None, entity_map=None):
"""Escape attribute value."""
try:
if encoding:
try:
text = text.encode(encoding)
except UnicodeError:
return encode_entity(text, entities=entity_map)
text = text.replace("&", "&")
text = text.replace("<", "<")
text = text.replace("\"", """)
except (TypeError, AttributeError):
raise_serialization_error(text)
return text
escape_attrib = staticmethod(escape_attrib)
class HTMLBased(object):
"""Mixin class for HTML based serializers."""
inject_type = None
empty_elements = set([
'area', 'base', 'basefont', 'br', 'col', 'frame', 'hr',
'img', 'input', 'isindex', 'link', 'meta', 'param'])
formatted_elements = set([
'code', 'kbd', 'math', 'pre', 'script', 'textarea'])
inline_elements = set(['a', 'abbr', 'acronym', 'b', 'basefont',
'bdo', 'big', 'br', 'cite', 'code', 'dfn', 'em', 'font',
'i', 'img', 'input', 'kbd', 'label', 'q', 's', 'samp',
'select', 'small', 'span', 'strike', 'strong', 'sub', 'sup',
'textarea', 'tt', 'u', 'var'])
def can_be_empty_element(self, tag):
return self.tagname(tag) in self.empty_elements
def is_formatted(self, tag):
return self.tagname(tag) in self.formatted_elements
def is_inline(self, tag):
return self.tagname(tag) in self.inline_elements
def is_escape(self, tag):
return self.tagname(tag) not in self.noescape_elements
def inject_meta_content_type(self, stream, encoding):
"""Injects a meta tag for the content-type."""
return self.inject_meta_tags(stream,
[{'http-equiv': 'content-type',
'content': 'text/html; charset=%s' % encoding}])
def inject_meta_tags(self, stream, taglist):
"""Injects meta tags at the start of the head section.
If meta tags already exist at that position, they are kept.
Expects a list of meta-tag attributes with content keys.
The attribute names and values must be given in lower case.
"""
done = False
meta_tag = None
for ev, item in stream:
if not done:
if ev in (START, END):
tag = self.tagname(item.tag)
if meta_tag:
if item.tag == meta_tag:
if ev == START:
for attributes in taglist:
for attrib, value in item.items():
attrib = attrib.lower()
if attrib == 'content':
continue
if attrib not in attributes:
break
value = value.lower()
if attributes[attrib] != value:
break
else:
# that meta tag exists already
attributes['content'] = None
break
else:
for attributes in taglist:
if attributes['content'] is None:
continue
meta_item = Element(meta_tag, **attributes)
yield START, meta_item
yield END, meta_item
yield TEXT, '\n'
done = True
elif tag == 'head' and ev == START:
meta_tag = item.tag[:-4] + 'meta'
yield ev, item
class HTMLSerializer(HTMLBased, Serializer):
doctype = doctypes['html']
transpose = False
inject_type = True
entity_map = None
noescape_elements = set([
'script', 'style'])
boolean_attributes = set(
['selected', 'checked', 'compact', 'declare',
'defer', 'disabled', 'ismap', 'multiple', 'nohref',
'noresize', 'noshade', 'nowrap'])
def __init__(self, encoding='utf-8', doctype=None, transpose=False,
inject_type=None, entity_map=None, format=None):
"""Initialize HTMLSerializer.
You can change the following parameters:
encoding: the output encoding
doctype: add doctype (None, string, tuple)
transpose: alter tag names (None, True/False, callable)
inject_type: inject content type (True/False)
entity_map: use named entities for output (True/False or mapping)
format: format to be applied (string or instance of Format)
"""
Serializer.__init__(self, encoding=encoding, format=format)
if doctype is not None:
self.doctype = doctype
self.transpose = transpose
if inject_type is not None:
self.inject_type = inject_type
if entity_map is not None:
self.entity_map = entity_map
def tagname(tag):
"""Remove namespace from tag and make it lowercase."""
if isinstance(tag, basestring):
if tag.startswith('{'):
tag = tag.split('}', 1)[-1]
tag = tag.lower()
return tag
tagname = staticmethod(tagname)
def is_escape(self, tag):
return self.tagname(tag) not in self.noescape_elements
def is_boolean_attribute(self, attribute):
return attribute in self.boolean_attributes
def generate(self, stream, encoding=None,
fragment=False, format=None):
"""Serializes an event stream to bytes of the specified encoding.
This function yields an encoded string over and over until the
stream is exhausted.
"""
doctype = self.doctype
encoding = encoding or self.encoding or 'utf-8'
entity_map = self.entity_map
transpose = self.transpose
inject_type = self.inject_type
format = self._get_format(format)
if format:
if format.doctype is not None:
doctype = format.doctype
if format.entity_map is not None:
entity_map = format.entity_map
if format.transpose is not None:
transpose = format.transpose
if format.inject_type is not None:
inject_type = format.inject_type
if entity_map == True:
# if True, use default HTML entity map
entity_map = default_entity_map
elif entity_map == False:
entity_map = None
if isinstance(doctype, basestring):
# allow doctype strings
doctype = doctypes[self.doctype]
if transpose is not None:
if not callable(transpose):
if transpose:
transpose = lambda s: s.upper()
else:
transpose = lambda s: s.lower()
escape_cdata = HTMLSerializer.escape_cdata
escape_attrib = HTMLSerializer.escape_attrib
names = NamespaceStack(self.namespaces)
def grok_name(tag):
if tag[0] == '{':
uri, localname = tag[1:].split('}', 1)
else:
uri, localname = None, tag
if uri and uri != xhtml_uri:
qname = names.qname(tag, default=False)
else:
qname = localname
if transpose:
qname = transpose(qname)
return uri, localname, qname
current = None
stack = [current]
stream = iter(stream)
if not fragment and doctype is not None:
yield serialize_doctype(doctype) + '\n'
if inject_type and encoding:
stream = self.inject_meta_content_type(stream, encoding)
for ev, item in self.apply_filters(stream, format):
if ev == TEXT and item:
escape = self.is_escape(current)
yield escape_cdata(item, encoding, entity_map, escape)
elif ev == START:
if item.tag == Comment:
yield "<!--%s-->" % item.text.encode(encoding)
continue
elif item.tag == ProcessingInstruction:
yield "<?%s>" % item.text.encode(encoding)
continue
elif item.tag == Fragment:
continue
else:
names.push(namespaces(item, remove=True))
tag = item.tag
qname = grok_name(tag)[2]
# push this name on the stack so we know where we are
current = qname.lower()
stack.append(current)
yield "<" + qname.encode(encoding)
attrs = item.attrib.items()
if attrs:
for k, v in attrs:
q = grok_name(k)[2]
lq = q.lower()
if lq == 'xml:lang':
continue
if self.is_boolean_attribute(lq):
# XXX: what if v is 0, false, or no.
# should we omit the attribute?
yield ' %s' % q.encode(encoding)
else:
yield ' %s="%s"' % (
q.encode(encoding),
escape_attrib(v, encoding, entity_map))
yield ">"
elif ev == END and item.tag not in (
Comment, ProcessingInstruction, Fragment):
current = stack.pop()
if not self.can_be_empty_element(current):
tag = item.tag
qname = grok_name(tag)[2]
yield "</%s>" % qname.encode(encoding)
current = stack[-1]
names.pop()
def escape_cdata(text, encoding=None, entity_map=None, escape=True):
"""Escape character data."""
try:
if encoding:
try:
text = text.encode(encoding)
except UnicodeError:
return encode_entity(text, entities=entity_map)
if escape:
text = text.replace("&", "&")
text = text.replace("<", "<")
except (TypeError, AttributeError):
raise_serialization_error(text)
return text
escape_cdata = staticmethod(escape_cdata)
def escape_attrib(text, encoding=None, entity_map=None):
"""Escape attribute value."""
try:
if encoding:
try:
text = text.encode(encoding)
except UnicodeError:
return encode_entity(text, entities=entity_map)
text = text.replace("&", "&")
text = text.replace("\"", """)
except (TypeError, AttributeError):
raise_serialization_error(text)
return text
escape_attrib = staticmethod(escape_attrib)
class XHTMLSerializer(HTMLBased, XMLSerializer):
doctype = doctypes['xhtml']
inject_type = True
def __init__(self, encoding='utf-8', decl=None, doctype=None,
inject_type=None, entity_map=None, namespaces=None, format=None):
"""Initialize XHTMLSerializer."""
XMLSerializer.__init__(self, encoding=encoding,
decl=decl, doctype=doctype, entity_map=entity_map,
namespaces=namespaces, format=format)
if inject_type is not None:
self.inject_type = inject_type
def tagname(tag):
"""Remove namespace from tag."""
if isinstance(tag, basestring) and tag.startswith('{%s}' % xhtml_uri):
tag = tag.split('}', 1)[-1]
return tag
tagname = staticmethod(tagname)
def generate(self, stream, encoding=None,
fragment=False, format=None):
encoding = encoding or self.encoding or 'utf-8'
inject_type = self.inject_type
format = self._get_format(format)
if format:
if format.inject_type is not None:
inject_type = format.inject_type
if inject_type and encoding:
stream = self.inject_meta_content_type(stream, encoding)
return XMLSerializer.generate(self, stream, encoding=encoding,
fragment=fragment, format=format)
class PlainSerializer(Serializer):
def generate(self, stream, encoding=None,
fragment=False, format=None):
"""Generate only the text content."""
encoding = encoding or self.encoding or 'utf-8'
for ev, item in self.apply_filters(stream, format):
if ev == TEXT:
yield item
class NamespaceStack:
"""Maintains a stack of namespace prefix to URI mappings."""
def __init__(self, default_map=namespace.namespaces):
self.stack = []
self.default_map = default_map
self.push()
self.ns_count = 0
def push(self, names=None):
if names is None:
names = {}
self.current = names
self.stack.insert(0, self.current)
def pop(self):
names = self.stack.pop(0)
if self.stack:
self.current = self.stack[0]
return names
def resolve_prefix(self, uri, default=True):
"""Figure out prefix given a URI."""
if uri == xml_uri:
return 'xml'
# first check if the default is correct
is_default = None
prefix = None
for names in self.stack:
for p, u in names.items():
if default and is_default is None and not p:
# this is the current default namespace
is_default = (u == uri)
if (default and is_default) or prefix:
break
if u == uri and p:
prefix = p
if is_default is not None:
break
if default and is_default == True:
return ''
elif prefix:
return prefix
else:
return None
def resolve_uri(self, prefix):
"""Figure out URI given a prefix."""
if prefix == 'xml':
return xml_uri
for names in self.stack:
uri = names.get(prefix)
if uri:
return uri
return None
def qname(self, cname, default=False):
if isinstance(cname, QName):
cname = cname.text
if cname[0] != '{':
# XXX: need to make sure default namespace is "no-namespace"
return cname
uri, localname = cname[1:].split('}', 1)
prefix = self.resolve_prefix(uri, default)
if prefix is None:
# see if we have it in our default map
prefix = self.default_map.get(uri)
if prefix is not None:
self.current[prefix] = uri
else:
if default and not self.current.has_key(''):
prefix = ''
self.current[prefix] = uri
else:
self.ns_count += 1
# XXX : need to check for collisions here.
prefix = 'ns%d' % self.ns_count
self.current[prefix] = uri
if prefix != '':
return '%s:%s' % (prefix, localname)
else:
return localname
def serialize_doctype(doctype):
if isinstance(doctype, basestring):
return doctype
elif len(doctype) == 1:
return '<!DOCTYPE %s>' % doctype
elif len(doctype) == 2:
return '<!DOCTYPE %s PUBLIC "%s">' % doctype
else:
return '<!DOCTYPE %s PUBLIC "%s" "%s">' % doctype
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