import urlparse
import os
+
class InvalidICS(Exception): pass
-class notJoined(Exception): pass
+class IncompleteICS(InvalidICS): pass
def lineJoiner(oldcal):
'''Takes a string containing a calendar and returns an array of its lines'''
+ if not oldcal[0:15] == 'BEGIN:VCALENDAR':
+ raise InvalidICS, "Does not appear to be a valid ICS file"
+
+ if not 'END:VCALENDAR' in oldcal[-15:-1]:
+ raise IncompleteICS, "File appears to be incomplete"
+
if list(oldcal) == oldcal:
oldcal = '\r\n'.join(oldcal)
- oldcal.replace('\r\n ', '')
- return oldcal.split('\r\n')
+ oldcal = oldcal.replace('\r\n ', '').replace('\r\n\t','')
+ return oldcal.strip().split('\r\n')
def lineFolder(oldcal, length=75):
if len(line.rstrip()) <= length:
cal.append(line)
else:
- brokenline = [line[0:length] + '\r\n']
+ brokenline = [line[0:length]]
ll = length
- while ll < len(line.rstrip('\r\n')) + 1:
- brokenline.append(' ' + line[ll:sl+ll].rstrip('\r\n') + '\r\n')
+ while ll < len(line) + 1:
+ brokenline.append(line[ll:sl+ll])
ll += sl
- cal += brokenline
+ brokenline = '\r\n '.join(brokenline)
+ cal.append(brokenline)
return cal
+
+def splitFields(cal):
+ '''Takes a list of lines in a calendar file and returns a list of tuples
+ as (key, value) pairs'''
+
+ ical = [tuple(x.split(':',1)) for x in cal]
+
+ # Check that we got 2 items on every line
+ for line in ical:
+ if not len(line) == 2:
+ raise InvalidICS, "Didn't find a content key on: %s"%(line)
+
+ return ical
+
+
+def joinFields(ical):
+ '''Takes a list of tuples that make up a calendar file and returns it to a
+ list of lines'''
+
+ return [':'.join(x) for x in ical]
+
+
def getContent(url='',stdin=False):
'''Generic content retriever, DO NOT use this function in a CGI script as
it can read from the local disk (which you probably don't want it to).
res = urllib2.urlopen(url)
content = res.read()
res.close()
- except (urllib2.URLError, ValueError), e:
+ except (urllib2.URLError, OSError), e:
sys.stderr.write('%s\n'%e)
sys.exit(1)
return content
def getHTTPContent(url='',cache='.httplib2-cache'):
'''This function attempts to play nice when retrieving content from HTTP
- services. It's what you should use in a CGI script. It will (by default)
- slurp the first 20 bytes of the file and check that we are indeed looking
- at an ICS file before going for broke.'''
+ services. It's what you should use in a CGI script.'''
try:
import httplib2
try:
content = urllib2.urlopen(url).read()
return content
- except urllib2.URLError, e:
+ except (urllib2.URLError, OSError), e:
sys.stderr.write('%s\n'%e)
sys.exit(1)
return ''
+
+def generateRules():
+ '''Attempts to load a series of rules into a list'''
+ try:
+ import parserrules
+ except ImportError:
+ return []
+
+ rules = [getattr(parserrules, rule) for rule in dir(parserrules) if callable(getattr(parserrules, rule))]
+ return rules
+
+
+def applyRules(ical, rules=[], verbose=False):
+ 'Runs a series of rules on the lines in ical and mangles its output'
+
+ for rule in rules:
+ output = []
+ if rule.__doc__ and verbose:
+ print(rule.__doc__)
+ for line in ical:
+ try:
+ out = rule(line[0],line[1])
+ except TypeError, e:
+ output.append(line)
+ print(e)
+ continue
+
+ # Drop lines that are boolean False
+ if not out and not out == None: continue
+
+ # If the rule did something and is a tuple or a list we'll accept it
+ # otherwise, pay no attention to the man behind the curtain
+ try:
+ if tuple(out) == out or list(out) == out and len(out) == 2:
+ output.append(tuple(out))
+ else:
+ output.append(line)
+ except TypeError, e:
+ output.append(line)
+
+ ical = output
+
+ return ical
+
+
+def writeOutput(cal, outfile=''):
+ '''Takes a list of lines and outputs to the specified file'''
+
+ if not cal:
+ sys.stderr.write('Refusing to write out an empty file')
+ sys.exit(0)
+
+ if not outfile:
+ out = sys.stdout
+ else:
+ try:
+ out = open(outfile, 'w')
+ except (IOError, OSError), e:
+ sys.stderr.write('%s\n'%e)
+ sys.exit(1)
+
+ if cal[-1]: cal.append('')
+
+ out.write('\r\n'.join(cal))
+
+ if not out == sys.stdout:
+ out.close()
+
+
if __name__ == '__main__':
from optparse import OptionParser
# If the user passed us a 'stdin' argument, we'll go with that,
parser = OptionParser('usage: %prog [options] url')
parser.add_option('-s', '--stdin', action='store_true', dest='stdin',
default=False, help='Take a calendar from standard input')
+ parser.add_option('-v', '--verbose', action='store_true', dest='verbose',
+ default=False, help='Be verbose when rules are being applied')
parser.add_option('-o', '--output', dest='outfile', default='',
help='Specify output file (defaults to standard output)')
url = ''
content = getContent(url, options.stdin)
+ cal = lineJoiner(content)
+ ical = applyRules(splitFields(cal), generateRules(), options.verbose)
+ output = lineFolder(joinFields(ical))
+ writeOutput(output, options.outfile)
git.ucc.asn.au / frenchie / icalparse.git / blobdiff
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