Initial Commit, includes folding and unfolding lines

diff --git a/icalparse.py b/icalparse.py
new file mode 100755 (executable)
index 0000000..5c3a34f
--- /dev/null
+++ b/icalparse.py
@@ -0,0 +1,89 @@
+#!/usr/bin/python
+#
+# Copyright (c) 2010 James French <[email protected]>
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import sys
+import re
+
+try:
+       import httplib2
+       urllib = False
+except ImportError:
+       try:
+               import urllib
+               urllib = True
+       except:
+               sys.stderr.write('Failed to find a suitable http downloader\n')
+               raise
+
+class InvalidICS(Exception): pass
+class notJoined(Exception): pass
+
+# RFC5545 and RFC5546 iCalendar registries contain upper case letters
+# and dashes only and are separated from the value by a colon (:)
+itemstart = re.compile('^[A-Z\-]+:.*')
+def lineJoiner(oldcal):
+       '''Unfolds a calendar so that items can be parsed'''    
+       
+       cal = []
+       
+       # Strip newlines (
+       for line in oldcal:
+               line = line.rstrip('\r\n')
+
+               # Reassemble broken Lines
+               if not line:
+                       if not cal: continue
+                       else: cal[-1] += '\\n'
+               elif line[0] == ' ':
+                       if not cal: raise InvalidICS, 'First line of ICS must be element'
+                       line = line[1:len(line)]
+                       cal[-1] += line
+               elif not itemstart.match(line):
+                       if not cal: raise InvalidICS, 'First line of ICS must be element'
+                       cal[-1] += '\\n' + line
+               else:
+                       if cal: cal[-1] += '\r\n'
+                       cal.append(line)
+
+       cal[-1] += '\r\n'
+
+       return cal
+
+def lineSplitter(oldcal, length=75):
+       '''Folds content lines to a specified length, returns a list'''
+
+       cal = []
+       sl = length - 1
+
+       for line in oldcal:
+               # Line & line ending line ending fit inside length, do nothing
+               if len(line.rstrip()) <= length:
+                       cal.append(line)
+               else:
+                       brokenline = [line[0:length] + '\r\n']
+                       ll = length
+                       while ll < len(line.rstrip('\r\n')) + 1:
+                               brokenline.append(' ' + line[ll:sl+ll].rstrip('\r\n') + '\r\n')
+                               ll += sl
+                       cal += brokenline
+
+       return cal