You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
234 lines
8.0 KiB
234 lines
8.0 KiB
2 years ago
|
# cython: language_level=2
|
||
|
|
|
||
|
|
#
|
||
|
|
# Element generator factory by Fredrik Lundh.
|
||
|
|
#
|
||
|
|
# Source:
|
||
|
|
# http://online.effbot.org/2006_11_01_archive.htm#et-builder
|
||
|
|
# http://effbot.python-hosting.com/file/stuff/sandbox/elementlib/builder.py
|
||
|
|
#
|
||
|
|
# --------------------------------------------------------------------
|
||
|
|
# The ElementTree toolkit is
|
||
|
|
#
|
||
|
|
# Copyright (c) 1999-2004 by Fredrik Lundh
|
||
|
|
#
|
||
|
|
# By obtaining, using, and/or copying this software and/or its
|
||
|
|
# associated documentation, you agree that you have read, understood,
|
||
|
|
# and will comply with the following terms and conditions:
|
||
|
|
#
|
||
|
|
# Permission to use, copy, modify, and distribute this software and
|
||
|
|
# its associated documentation for any purpose and without fee is
|
||
|
|
# hereby granted, provided that the above copyright notice appears in
|
||
|
|
# all copies, and that both that copyright notice and this permission
|
||
|
|
# notice appear in supporting documentation, and that the name of
|
||
|
|
# Secret Labs AB or the author not be used in advertising or publicity
|
||
|
|
# pertaining to distribution of the software without specific, written
|
||
|
|
# prior permission.
|
||
|
|
#
|
||
|
|
# SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
|
||
|
|
# TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANT-
|
||
|
|
# ABILITY AND FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR
|
||
|
|
# BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
|
||
|
|
# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
|
||
|
|
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
|
||
|
|
# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
|
||
|
|
# OF THIS SOFTWARE.
|
||
|
|
# --------------------------------------------------------------------
|
||
|
|
|
||
|
|
"""
|
||
|
|
The ``E`` Element factory for generating XML documents.
|
||
|
|
"""
|
||
|
|
|
||
|
|
from __future__ import absolute_import
|
||
|
|
|
||
|
|
import lxml.etree as ET
|
||
|
|
_QName = ET.QName
|
||
|
|
|
||
|
|
from functools import partial
|
||
|
|
|
||
|
|
try:
|
||
|
|
basestring
|
||
|
|
except NameError:
|
||
|
|
basestring = str
|
||
|
|
|
||
|
|
try:
|
||
|
|
unicode
|
||
|
|
except NameError:
|
||
|
|
unicode = str
|
||
|
|
|
||
|
|
|
||
|
|
class ElementMaker(object):
|
||
|
|
"""Element generator factory.
|
||
|
|
|
||
|
|
Unlike the ordinary Element factory, the E factory allows you to pass in
|
||
|
|
more than just a tag and some optional attributes; you can also pass in
|
||
|
|
text and other elements. The text is added as either text or tail
|
||
|
|
attributes, and elements are inserted at the right spot. Some small
|
||
|
|
examples::
|
||
|
|
|
||
|
|
>>> from lxml import etree as ET
|
||
|
|
>>> from lxml.builder import E
|
||
|
|
|
||
|
|
>>> ET.tostring(E("tag"))
|
||
|
|
'<tag/>'
|
||
|
|
>>> ET.tostring(E("tag", "text"))
|
||
|
|
'<tag>text</tag>'
|
||
|
|
>>> ET.tostring(E("tag", "text", key="value"))
|
||
|
|
'<tag key="value">text</tag>'
|
||
|
|
>>> ET.tostring(E("tag", E("subtag", "text"), "tail"))
|
||
|
|
'<tag><subtag>text</subtag>tail</tag>'
|
||
|
|
|
||
|
|
For simple tags, the factory also allows you to write ``E.tag(...)`` instead
|
||
|
|
of ``E('tag', ...)``::
|
||
|
|
|
||
|
|
>>> ET.tostring(E.tag())
|
||
|
|
'<tag/>'
|
||
|
|
>>> ET.tostring(E.tag("text"))
|
||
|
|
'<tag>text</tag>'
|
||
|
|
>>> ET.tostring(E.tag(E.subtag("text"), "tail"))
|
||
|
|
'<tag><subtag>text</subtag>tail</tag>'
|
||
|
|
|
||
|
|
Here's a somewhat larger example; this shows how to generate HTML
|
||
|
|
documents, using a mix of prepared factory functions for inline elements,
|
||
|
|
nested ``E.tag`` calls, and embedded XHTML fragments::
|
||
|
|
|
||
|
|
# some common inline elements
|
||
|
|
A = E.a
|
||
|
|
I = E.i
|
||
|
|
B = E.b
|
||
|
|
|
||
|
|
def CLASS(v):
|
||
|
|
# helper function, 'class' is a reserved word
|
||
|
|
return {'class': v}
|
||
|
|
|
||
|
|
page = (
|
||
|
|
E.html(
|
||
|
|
E.head(
|
||
|
|
E.title("This is a sample document")
|
||
|
|
),
|
||
|
|
E.body(
|
||
|
|
E.h1("Hello!", CLASS("title")),
|
||
|
|
E.p("This is a paragraph with ", B("bold"), " text in it!"),
|
||
|
|
E.p("This is another paragraph, with a ",
|
||
|
|
A("link", href="http://www.python.org"), "."),
|
||
|
|
E.p("Here are some reserved characters: <spam&egg>."),
|
||
|
|
ET.XML("<p>And finally, here is an embedded XHTML fragment.</p>"),
|
||
|
|
)
|
||
|
|
)
|
||
|
|
)
|
||
|
|
|
||
|
|
print ET.tostring(page)
|
||
|
|
|
||
|
|
Here's a prettyprinted version of the output from the above script::
|
||
|
|
|
||
|
|
<html>
|
||
|
|
<head>
|
||
|
|
<title>This is a sample document</title>
|
||
|
|
</head>
|
||
|
|
<body>
|
||
|
|
<h1 class="title">Hello!</h1>
|
||
|
|
<p>This is a paragraph with <b>bold</b> text in it!</p>
|
||
|
|
<p>This is another paragraph, with <a href="http://www.python.org">link</a>.</p>
|
||
|
|
<p>Here are some reserved characters: <spam&egg>.</p>
|
||
|
|
<p>And finally, here is an embedded XHTML fragment.</p>
|
||
|
|
</body>
|
||
|
|
</html>
|
||
|
|
|
||
|
|
For namespace support, you can pass a namespace map (``nsmap``)
|
||
|
|
and/or a specific target ``namespace`` to the ElementMaker class::
|
||
|
|
|
||
|
|
>>> E = ElementMaker(namespace="http://my.ns/")
|
||
|
|
>>> print(ET.tostring( E.test ))
|
||
|
|
<test xmlns="http://my.ns/"/>
|
||
|
|
|
||
|
|
>>> E = ElementMaker(namespace="http://my.ns/", nsmap={'p':'http://my.ns/'})
|
||
|
|
>>> print(ET.tostring( E.test ))
|
||
|
|
<p:test xmlns:p="http://my.ns/"/>
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, typemap=None,
|
||
|
|
namespace=None, nsmap=None, makeelement=None):
|
||
|
|
self._namespace = '{' + namespace + '}' if namespace is not None else None
|
||
|
|
self._nsmap = dict(nsmap) if nsmap else None
|
||
|
|
|
||
|
|
assert makeelement is None or callable(makeelement)
|
||
|
|
self._makeelement = makeelement if makeelement is not None else ET.Element
|
||
|
|
|
||
|
|
# initialize the default type map functions for this element factory
|
||
|
|
typemap = dict(typemap) if typemap else {}
|
||
|
|
|
||
|
|
def add_text(elem, item):
|
||
|
|
try:
|
||
|
|
last_child = elem[-1]
|
||
|
|
except IndexError:
|
||
|
|
elem.text = (elem.text or "") + item
|
||
|
|
else:
|
||
|
|
last_child.tail = (last_child.tail or "") + item
|
||
|
|
|
||
|
|
def add_cdata(elem, cdata):
|
||
|
|
if elem.text:
|
||
|
|
raise ValueError("Can't add a CDATA section. Element already has some text: %r" % elem.text)
|
||
|
|
elem.text = cdata
|
||
|
|
|
||
|
|
if str not in typemap:
|
||
|
|
typemap[str] = add_text
|
||
|
|
if unicode not in typemap:
|
||
|
|
typemap[unicode] = add_text
|
||
|
|
if ET.CDATA not in typemap:
|
||
|
|
typemap[ET.CDATA] = add_cdata
|
||
|
|
|
||
|
|
def add_dict(elem, item):
|
||
|
|
attrib = elem.attrib
|
||
|
|
for k, v in item.items():
|
||
|
|
if isinstance(v, basestring):
|
||
|
|
attrib[k] = v
|
||
|
|
else:
|
||
|
|
attrib[k] = typemap[type(v)](None, v)
|
||
|
|
|
||
|
|
if dict not in typemap:
|
||
|
|
typemap[dict] = add_dict
|
||
|
|
|
||
|
|
self._typemap = typemap
|
||
|
|
|
||
|
|
def __call__(self, tag, *children, **attrib):
|
||
|
|
typemap = self._typemap
|
||
|
|
|
||
|
|
# We'll usually get a 'str', and the compiled type check is very fast.
|
||
|
|
if not isinstance(tag, str) and isinstance(tag, _QName):
|
||
|
|
# A QName is explicitly qualified, do not look at self._namespace.
|
||
|
|
tag = tag.text
|
||
|
|
elif self._namespace is not None and tag[0] != '{':
|
||
|
|
tag = self._namespace + tag
|
||
|
|
elem = self._makeelement(tag, nsmap=self._nsmap)
|
||
|
|
if attrib:
|
||
|
|
typemap[dict](elem, attrib)
|
||
|
|
|
||
|
|
for item in children:
|
||
|
|
if callable(item):
|
||
|
|
item = item()
|
||
|
|
t = typemap.get(type(item))
|
||
|
|
if t is None:
|
||
|
|
if ET.iselement(item):
|
||
|
|
elem.append(item)
|
||
|
|
continue
|
||
|
|
for basetype in type(item).__mro__:
|
||
|
|
# See if the typemap knows of any of this type's bases.
|
||
|
|
t = typemap.get(basetype)
|
||
|
|
if t is not None:
|
||
|
|
break
|
||
|
|
else:
|
||
|
|
raise TypeError("bad argument type: %s(%r)" %
|
||
|
|
(type(item).__name__, item))
|
||
|
|
v = t(elem, item)
|
||
|
|
if v:
|
||
|
|
typemap.get(type(v))(elem, v)
|
||
|
|
|
||
|
|
return elem
|
||
|
|
|
||
|
|
def __getattr__(self, tag):
|
||
|
|
return partial(self, tag)
|
||
|
|
|
||
|
|
|
||
|
|
# create factory object
|
||
|
|
E = ElementMaker()
|