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File Content: `builder.py`

#
# 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.
"""

import lxml.etree as ET

try:
    from functools import partial
except ImportError:
    # fake it for pre-2.5 releases
    def partial(func, tag):
        return lambda *args, **kwargs: func(tag, *args, **kwargs)

try:
    callable
except NameError:
    # Python 3
    def callable(f):
        return hasattr(f, '__call__')

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 reservered 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 reservered characters: &lt;spam&amp;egg&gt;.</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):
        if namespace is not None:
            self._namespace = '{' + namespace + '}'
        else:
            self._namespace = None

        if nsmap:
            self._nsmap = dict(nsmap)
        else:
            self._nsmap = None

        if makeelement is not None:
            assert callable(makeelement)
            self._makeelement = makeelement
        else:
            self._makeelement = ET.Element

        # initialize type map for this element factory

        if typemap:
            typemap = typemap.copy()
        else:
            typemap = {}
        
        def add_text(elem, item):
            try:
                elem[-1].tail = (elem[-1].tail or "") + item
            except IndexError:
                elem.text = (elem.text or "") + item
        if str not in typemap:
            typemap[str] = add_text
        if unicode not in typemap:
            typemap[unicode] = add_text

        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):
        get = self._typemap.get

        if self._namespace is not None and tag[0] != '{':
            tag = self._namespace + tag
        elem = self._makeelement(tag, nsmap=self._nsmap)
        if attrib:
            get(dict)(elem, attrib)

        for item in children:
            if callable(item):
                item = item()
            t = 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 = 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:
                get(type(v))(elem, v)

        return elem

    def __getattr__(self, tag):
        return partial(self, tag)

# create factory object
E = ElementMaker()

Name	Size	Permission
html	---	0755
includes	---	0755
isoschematron	---	0755
ElementInclude.py	7641 bytes	0644
ElementInclude.pyc	4436 bytes	0644
ElementInclude.pyo	4436 bytes	0644
__init__.py	551 bytes	0644
__init__.pyc	776 bytes	0644
__init__.pyo	776 bytes	0644
_elementpath.py	9311 bytes	0644
_elementpath.pyc	7646 bytes	0644
_elementpath.pyo	7646 bytes	0644
builder.py	7855 bytes	0644
builder.pyc	6684 bytes	0644
builder.pyo	6640 bytes	0644
cssselect.py	3471 bytes	0644
cssselect.pyc	4133 bytes	0644
cssselect.pyo	4133 bytes	0644
doctestcompare.py	18287 bytes	0644
doctestcompare.pyc	17153 bytes	0644
doctestcompare.pyo	17153 bytes	0644
etree.so	1402496 bytes	0755
lxml.etree.h	9254 bytes	0644
lxml.etree_api.h	16534 bytes	0644
objectify.so	306264 bytes	0755
pyclasslookup.py	87 bytes	0644
pyclasslookup.pyc	213 bytes	0644
pyclasslookup.pyo	213 bytes	0644
sax.py	8493 bytes	0644
sax.pyc	8867 bytes	0644
sax.pyo	8867 bytes	0644
usedoctest.py	230 bytes	0644
usedoctest.pyc	427 bytes	0644
usedoctest.pyo	427 bytes	0644

File Content: builder.py

File Content: `builder.py`