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"""Pretty print an XML document.
LICENCE:
Copyright (c) 2008, Fredrik Ekholdt
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of Fredrik Ekholdt nor the names of its contributors may be used to
endorse or promote products derived from this software without specific prior
written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE."""
import sys as _sys
import re as _re
def _usage(this_file):
return """SYNOPSIS: pretty print an XML document
USAGE: python %s <filename> \n""" % this_file
def _pprint_line(indent_level, line, width=100, output=_sys.stdout):
if line.strip():
start = ""
number_chars = 0
for l in range(indent_level):
start = start + " "
number_chars = number_chars + 1
try:
elem_start = _re.findall("(\<\W{0,1}\w+:\w+) ?", line)[0]
elem_finished = _re.findall("([?|\]\]/]*\>)", line)[0]
#should not have *
attrs = _re.findall("(\S*?\=\".*?\")", line)
output.write(start + elem_start)
number_chars = len(start + elem_start)
for attr in attrs:
if (attrs.index(attr) + 1) == len(attrs):
number_chars = number_chars + len(elem_finished)
if (number_chars + len(attr) + 1) > width:
output.write("\n")
for i in range(len(start + elem_start) + 1):
output.write(" ")
number_chars = len(start + elem_start) + 1
else:
output.write(" ")
number_chars = number_chars + 1
output.write(attr)
number_chars = number_chars + len(attr)
output.write(elem_finished + "\n")
except IndexError:
#give up pretty print this line
output.write(start + line + "\n")
def _pprint_elem_content(indent_level, line, output=_sys.stdout):
if line.strip():
for l in range(indent_level):
output.write(" ")
output.write(line + "\n")
def _get_next_elem(data):
start_pos = data.find("<")
end_pos = data.find(">") + 1
retval = data[start_pos:end_pos]
stopper = retval.rfind("/")
if stopper < retval.rfind("\""):
stopper = -1
single = (stopper > -1 and ((retval.find(">") - stopper) < (stopper - retval.find("<"))))
ignore_excl = retval.find("<!") > -1
ignore_question = retval.find("<?") > -1
if ignore_excl:
cdata = retval.find("<![CDATA[") > -1
if cdata:
end_pos = data.find("]]>")
if end_pos > -1:
end_pos = end_pos + len("]]>")
elif ignore_question:
end_pos = data.find("?>") + len("?>")
ignore = ignore_excl or ignore_question
no_indent = ignore or single
#print retval, end_pos, start_pos, stopper > -1, no_indent
return start_pos, \
end_pos, \
stopper > -1, \
no_indent
def get_pprint(xml, indent=4, width=80):
"""Returns the pretty printed xml """
class out:
output = ""
def write(self, string):
self.output += string
out = out()
pprint(xml, output=out, indent=indent, width=width)
return out.output
def pprint(xml, output=_sys.stdout, indent=4, width=80):
"""Pretty print xml.
Use output to select output stream. Default is sys.stdout
Use indent to select indentation level. Default is 4 """
data = xml
indent_level = 0
start_pos, end_pos, is_stop, no_indent = _get_next_elem(data)
while ((start_pos > -1 and end_pos > -1)):
_pprint_elem_content(indent_level, data[:start_pos].strip(),
output=output)
data = data[start_pos:]
if is_stop and not no_indent:
indent_level = indent_level - indent
_pprint_line(indent_level,
data[:end_pos - start_pos],
width=width,
output=output)
data = data[end_pos - start_pos:]
if not is_stop and not no_indent :
indent_level = indent_level + indent
if not data:
break
else:
start_pos, end_pos, is_stop, no_indent = _get_next_elem(data)
if __name__ == "__main__":
if "-h" in _sys.argv or "--help" in _sys.argv:
_sys.stderr.write(_usage(_sys.argv[0]))
_sys.exit(1)
if len(_sys.argv) < 2:
_sys.stderr.write(_usage(_sys.argv[0]))
_sys.exit(1)
else:
filename = _sys.argv[1]
fh = open(filename)
pprint(fh.read(), output=_sys.stdout, indent=4, width=80)
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