/
xmlbuilder.py
74 lines (65 loc) · 1.92 KB
/
xmlbuilder.py
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__author__ = ('Jonas Galvez', 'jonas@codeazur.com.br', 'http://jonasgalvez.com.br')
from __future__ import with_statement
import sys
class GeneratorContextManager(object):
def __init__(self, gen):
self.gen = gen
def __enter__(self):
try:
return self.gen.next()
except StopIteration:
raise RuntimeError("generator didn't yield")
def __exit__(self, type, value, traceback):
if type is None:
try:
self.gen.next()
except StopIteration:
return
else:
raise RuntimeError("generator didn't stop")
else:
try:
self.gen.throw(type, value, traceback)
raise RuntimeError("generator didn't stop after throw()")
except StopIteration:
return True
except:
if sys.exc_info()[1] is not value:
raise
def contextmanager(ref, name, func):
def helper(*args, **kwds):
if len(args) > 0:
ref.write_element(name, args[0])
else:
return GeneratorContextManager(func(*args, **kwds))
return helper
class XMLBuilder:
def __init__(self):
self.document = ""
def __getattr__(self, name):
return contextmanager(self, name, self._element_writer(name))
def _element_writer(self, name):
ref = self
def _write_element_generator(value=None):
try:
ref.document += '<%s>' % name
if value != None:
ref.document += value
yield
finally:
ref.document += '</%s>' % name
return _write_element_generator
def write_element(self, name, value):
self.document += '<%s>%s</%s>' % (name, value, name)
##### USAGE #####
xml = XMLBuilder()
entries = [{'name': 'Entry #1'}, {'name': 'Entry #2'}]
# pretty sweet, huh?
with xml.entries():
for entry in entries:
xml.entry(entry['name'])
print xml.document
'''
result:
<entries><entry>Entry #1</entry><entry>Entry #2</entry></entries>
'''