Rules implemented

[frenchie/icalparse.git] / icalparse.py

diff --git a/icalparse.py b/icalparse.py
index 780750b..cc41353 100755 (executable)
--- a/icalparse.py
+++ b/icalparse.py
@@ -70,6 +70,19 @@ def lineFolder(oldcal, length=75):
        return cal
 
 
+def splitFields(cal):
+       '''Takes a list of lines in a calendar file and returns a list of 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 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).
@@ -97,7 +110,7 @@ def getContent(url='',stdin=False):
                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
@@ -131,12 +144,56 @@ def getHTTPContent(url='',cache='.httplib2-cache'):
        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
+
 if __name__ == '__main__':
        from optparse import OptionParser
        # If the user passed us a 'stdin' argument, we'll go with that,
@@ -160,4 +217,5 @@ if __name__ == '__main__':
 
        content = getContent(url, options.stdin)
        cal = lineJoiner(content)
-       print cal
+       ical = applyRules(splitFields(cal), generateRules())
+       print ical