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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at
import json
from io import open
from os import path
_DEFAULT_SCRIPT = path.join(path.dirname(__file__), 'node_modules', 'axe-core', 'axe.min.js')
class Axe(object):
def __init__(self, selenium, script_url=_DEFAULT_SCRIPT):
self.script_url = script_url
self.selenium = selenium
def inject(self):
Recursively inject aXe into all iframes and the top level document.
:param script_url: location of the axe-core script.
:type script_url: string
with open(self.script_url, 'r', encoding='utf8') as f:
def execute(self, context=None, options=None):
Run axe against the current page.
:param context: which page part(s) to analyze and/or what to exclude.
:param options: dictionary of aXe options.
template = 'return{return result;});'
args = ''
# If context parameter is passed, add to args
if context is not None:
args += '%r' % context
# Add comma delimiter only if both parameters are passed
if context is not None and options is not None:
args += ','
# If options parameter is passed, add to args
if options is not None:
args += '%s' % options
command = template % args
response = self.selenium.execute_script(command)
return response
def report(self, violations):
Return readable report of accessibility violations found.
:param violations: Dictionary of violations.
:type violations: dict
:return report: Readable report of violations.
:rtype: string
string = ''
string += 'Found ' + str(len(violations)) + ' accessibility violations:'
for violation in violations:
string += '\n\n\nRule Violated:\n' + violation['id'] + ' - ' + violation['description'] + \
'\n\tURL: ' + violation['helpUrl'] + \
'\n\tImpact Level: ' + violation['impact'] + \
for tag in violation['tags']:
string += ' ' + tag
string += '\n\tElements Affected:'
i = 1
for node in violation['nodes']:
for target in node['target']:
string += '\n\t' + str(i) + ') Target: ' + target
i += 1
for item in node['all']:
string += '\n\t\t' + item['message']
for item in node['any']:
string += '\n\t\t' + item['message']
for item in node['none']:
string += '\n\t\t' + item['message']
string += '\n\n\n'
return string
def write_results(self, data, name='results.json'):
Write JSON to file with the specified name.
:param name: Name of file to be written to.
:param output: JSON object.
with open(name, 'r', encoding='utf8') as f:
f.write(json.dumps(data, indent=4))