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#! /usr/bin/python
#Copyright ReportLab Europe Ltd. 2000-2016
#see license.txt for license details
#history http://www.reportlab.co.uk/cgi-bin/viewcvs.cgi/public/reportlab/trunk/reportlab/lib/logger.py
__version__='3.3.0'
__doc__="Logging and warning framework, predating Python's logging package"
from sys import stderr
class Logger:
'''
An extended file type thing initially equivalent to sys.stderr
You can add/remove file type things; it has a write method
'''
def __init__(self):
self._fps = [stderr]
self._fns = {}
def add(self,fp):
'''add the file/string fp to the destinations'''
if isinstance(fp,str):
if fp in self._fns: return
fp = open(fn,'wb')
self._fns[fn] = fp
self._fps.append(fp)
def remove(self,fp):
'''remove the file/string fp from the destinations'''
if isinstance(fp,str):
if fp not in self._fns: return
fn = fp
fp = self._fns[fn]
del self.fns[fn]
if fp in self._fps:
del self._fps[self._fps.index(fp)]
def write(self,text):
'''write text to all the destinations'''
if text[-1]!='\n': text=text+'\n'
for fp in self._fps: fp.write(text)
def __call__(self,text):
self.write(text)
logger=Logger()
class WarnOnce:
def __init__(self,kind='Warn'):
self.uttered = {}
self.pfx = '%s: '%kind
self.enabled = 1
def once(self,warning):
if warning not in self.uttered:
if self.enabled: logger.write(self.pfx + warning)
self.uttered[warning] = 1
def __call__(self,warning):
self.once(warning)
warnOnce=WarnOnce()
infoOnce=WarnOnce('Info')