Viewing file:  XmlPrettyPrinter.py (3.16 KB) -rw-r--r--
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# $Header: /var/local/cvsroot/4Suite/Ft/Xml/Lib/XmlPrettyPrinter.py,v 1.10 2005/02/09 09:11:13 mbrown Exp $
"""
This module supports formatted document serialization in XML syntax.
Copyright 2005 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
from XmlPrinter import XmlPrinter
class XmlPrettyPrinter(XmlPrinter):
"""
An XmlPrettyPrinter instance provides functions for serializing an
XML or XML-like document to a stream, based on SAX-like event calls
initiated by an Ft.Xml.Lib.Print.PrintVisitor instance.
The methods in this subclass of XmlPrinter produce the same output
as the base class, but with extra whitespace added for visual
formatting. The indent attribute is the string used for each level
of indenting. It defaults to 2 spaces.
"""
# The amount of indent for each level of nesting
indent = ' '
def __init__(self, stream, encoding):
XmlPrinter.__init__(self, stream, encoding)
self._level = 0
self._canIndent = False # don't indent first element
return
def startElement(self, namespaceUri, tagName, namespaces, attributes):
if self._inElement:
self.writeAscii('>')
self._inElement = False
if self._canIndent:
self.writeAscii('\n' + (self.indent * self._level))
XmlPrinter.startElement(self, namespaceUri, tagName, namespaces,
attributes)
self._level += 1
self._canIndent = True
return
def endElement(self, namespaceUri, tagName):
self._level -= 1
# Do not break short tag form (<tag/>)
if self._canIndent and not self._inElement:
self.writeAscii('\n' + (self.indent * self._level))
XmlPrinter.endElement(self, namespaceUri, tagName)
# Allow indenting after endtags
self._canIndent = True
return
def text(self, data, disableEscaping=0):
XmlPrinter.text(self, data, disableEscaping)
# Do not allow indenting for elements with mixed content
self._canIndent = False
return
def cdataSection(self, data):
XmlPrinter.cdataSection(self, data)
# Do not allow indenting for elements with mixed content
self._canIndent = False
return
def processingInstruction(self, target, data):
if self._inElement:
self.writeAscii('>')
self._inElement = False
if self._canIndent:
self.writeAscii('\n' + (self.indent * self._level))
XmlPrinter.processingInstruction(self, target, data)
# Allow indenting after processing instructions
self._canIndent = True
return
def comment(self, data):
if self._inElement:
self.writeAscii('>')
self._inElement = False
if self._canIndent:
self.writeAscii('\n' + (self.indent * self._level))
XmlPrinter.comment(self, data)
# Allow indenting after comments
self._canIndent = True
return
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