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########################################################################
# $Header: /var/local/cvsroot/4Suite/Ft/Xml/MarkupWriter.py,v 1.2 2005/03/11 18:26:56 uogbuji Exp $
"""
MarkupWriter provides a very friendly interface for generating XML content
Copyright 2005 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
import sys
from Ft.Xml import XML_NAMESPACE, EMPTY_NAMESPACE, EMPTY_PREFIX, XMLNS_NAMESPACE
class MarkupWriter(object):
"""
General-purpose utility class for generating XML (may eventually be
expanded to produce more output types)
Sample usage:
from Ft.Xml import MarkupWriter
writer = MarkupWriter(indent=u"yes")
writer.startDocument()
writer.startElement(u'xsa')
writer.startElement(u'vendor')
#Element with simple text (#PCDATA) content
writer.simpleElement(u'name', content=u'Centigrade systems')
#Note writer.text(content) still works
writer.simpleElement(u'email', content=u"info@centigrade.bogus")
writer.endElement(u'vendor')
#Element with an attribute
writer.startElement(u'product', attributes={u'id': u"100\u00B0"})
#Note writer.attribute(name, value, namespace=None) still works
writer.simpleElement(u'name', content=u"100\u00B0 Server")
#XML fragment
writer.xmlFragment('<version>1.0</version><last-release>20030401</last-release>')
#Empty element
writer.simpleElement(u'changes')
writer.endElement(u'product')
writer.endElement(u'xsa')
writer.endDocument()
Note on the difference between 4Suite writers and printers
Writer - module that exposes a broad public API for building output
bit by bit
Printer - module that simply takes a DOM and creates output from it
as a whole, within one API invokation
"""
def __init__(self, stream=sys.stdout, **wargs):
"""
Convenience factory function for Markup writers (based on
xsl:output in XSLT)
"""
from Ft.Xml.Xslt.XmlWriter import XmlWriter
from Ft.Xml.Xslt.OutputParameters import OutputParameters
oparams = OutputParameters()
for arg in wargs:
setattr(oparams, arg, wargs[arg])
self.writer = XmlWriter(oparams, stream)
return
def __getattr__(self, value):
#Delegate to writer
#if hasattr(self, value):
# return object.self.__dict, value)
return getattr(self.writer, value)
def startElement(self, tagName, namespace=EMPTY_NAMESPACE, extraNss=None,
attributes=None):
"""
Create a start tag with optional attributes. Must eventually
be matched with an endElement call
tagName - qualified name of the element (must be unicode)
namespace - optional namespace URI
attribute - optional dictionary mapping name to unicode value
the name can either be a unicode QName or a tuple
of (QName, namespace URI)
"""
self.writer.startElement(tagName, namespace, extraNss)
if attributes is not None:
for name in attributes:
if isinstance(name, tuple):
name, namespace = name
value = attributes[name]
self.writer.attribute(name, value, namespace)
else:
value = attributes[name]
self.writer.attribute(name, value)
return
def simpleElement(self, tagName, namespace=EMPTY_NAMESPACE, extraNss=None,
attributes=None, content=u""):
"""
Create a simple tag with optional attributes and content. The
complete element, start tag, optional text content, end tag, will
all be generated by this one call. Must *not* be matched with
an endElement call
tagName - qualified name of the element (must be unicode)
namespace - optional namespace URI
attribute - optional dictionary mapping name to unicode value
the name can either be a unicode QName or a tuple
of (QName, namespace URI)
content - optional unicode object with the text body of the
simple element
"""
self.startElement(tagName, namespace, extraNss, attributes)
if content:
self.writer.text(content)
self.writer.endElement(tagName, namespace)
return
def xmlFragment(self, fragment):
"""
Incorporate a well-formed general entity into the output.
fragment of
fragment - string (must not be a Unicode object) to be incorporated
verbatim into the output, after testing for wellp-formedness
"""
from Ft.Xml.Domlette import EntityReader
#Essentially just a WF test.
#We don't actually use the resulting docfrag
docfrag = EntityReader.parseString(
fragment, 'urn:bogus:Ft.Xml.Xslt.MarkupWriter.xmlFragment')
self.writer._stream.write(fragment)
return
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