CSS Validator

css_validator.py

#!/usr/bin/env python

'''
	CSS Validator Automation Script
	*******************************

	Validates all css files in a given directory and writes 
	errors and warnings to log files in a separate directory.

	Ganesh Prasad Sahoo (c) 2015
	
	License: 	GNU GPL v3
	email:		[email protected]


	INSTRUCTIONS:
	*************

	1.

	If you are getting an Error about 'no module named poster',
	then install poster module using 'sudo pip install poster' on linux.
	For windows check the python package index website and download
	the zip file for the module and manually intall it.

	2.

	If you don't have pip installed on the machine, then install it using
	'sudo apt-get install python-pip'.

'''

__author__ = 'Ganesh Prasad Sahoo'
__version__ = '1.0'


import os
import sys
import re
import urllib2
from poster.encode import multipart_encode
from poster.streaminghttp import register_openers

CSS_VALIDATOR_URL = 'http://jigsaw.w3.org/css-validator/validator'
VERBOSE = False

def errorMessage( errMsg ):
	print >> sys.stderr, errMsg
	open('./css_validator_errors.log', 'a+').write( errMsg + '\n\n' )

def verbose( msg ):
	if VERBOSE:
		errorMessage( msg )

def validate( fileName ):
	"validates a single css file and stores the results in log file"
	register_openers()
	with open( fileName, 'r' ) as cssFileObject:
		data, header = multipart_encode( {"file": cssFileObject} )
		verbose( fileName+' encoded for the POST request' )
		destURL = urllib2.Request( CSS_VALIDATOR_URL, data, header )
		verbose( str(destURL)+' formed' )
		verbose( 'request sent' )
		response = urllib2.urlopen( destURL )
		verbose( 'response received' )
		result = response.read()

	# convert relative links in the response markup to absolute ones
	linksList = re.findall( 'href="(.*?)"', result )
	for link in linksList:
		if not link.startswith('http://'):
			result = result.replace( link, CSS_VALIDATOR_URL+link, 1)
	verbose( 'relative links converted' )	
	return result





if __name__ == '__main__':
	verbose( str(sys.argv) )
	if len(sys.argv) >= 2 and sys.argv[1] == '--verbose' or sys.argv[1]=='-v':
		VERBOSE = True
		args = sys.argv[2:]
		verbose( 'VERBOSE is set to True' )
	else:
		args = sys.argv[1:]
	verbose( str(args) )
	if len(args) == 0:
		errorMessage("Usage : %s [--verbose|-v] FILE|DIRECTORY ..."%os.path.basename(sys.argv[0]))
		exit(1)
	
	basePath = os.getcwd()
	verbose( 'BasePath : '+basePath )
	for path in args:
		if os.path.isdir(path):
			path = os.path.abspath(path)
			verbose( 'Type = Directory' )
			os.chdir(path)
			verbose( 'chdir '+path )
			if not os.path.exists('validation_result'):
				os.mkdir('validation_result')
				verbose( 'mkdir validation_result' )
			lsres = os.listdir(path)
			verbose( 'ls '+path)
			verbose( str(lsres) )
			for filename in lsres:
				if filename.lower().endswith('.css'):
					verbose( 'Validating '+filename )
					result = validate(filename)
					open('validation_result/'+filename[:-4]+'_result.html', 'w').write(result)
					verbose( 'result written to file validation_result/'+filename[:-4]+'_result.html' )
			os.chdir(basePath)
			verbose( 'chdir '+basePath )
		else:
			path = os.path.abspath(path)
			filename = os.path.basename(path)
			verbose( 'Type = File' )
			verbose( 'AbsolutePath = '+path )
			workdir = os.path.dirname(path)
			os.chdir(workdir)
			verbose( 'chdir '+workdir )
			if not os.path.exists('validation_result'):
				os.mkdir('validation_result')
				verbose( 'mkdir validation_result' )
			if path.lower().endswith('.css'):
				verbose( 'Validating '+path )
				result = validate(path)
				open('validation_result/'+filename[:-4]+'_result.html', 'w').write(result)
				verbose( 'result written to file validation_result/'+filename[:-4]+'_result.html' )
			os.chdir(basePath)
			verbose( 'chdir '+basePath )

	verbose( '...Complete' )