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from __future__ import print_function

from __future__ import unicode_literals

import argparse

import os.path

import re

import sys

import jsonschema

import jsonschema.exceptions

import pkg_resources

import yaml

from pre_commit.jsonschema_extensions import apply_defaults

def is_regex_valid(regex):

try:

re.compile(regex)

return True

except re.error:

return False

def get_validator(

json_schema,

exception_type,

additional_validation_strategy=lambda obj: None,

"""Returns a function which will validate a yaml file for correctness

Args:

json_schema - JSON schema to validate file with

exception_type - Error type to raise on failure

additional_validation_strategy - Strategy for additional validation of

the object read from the file. The function should either raise

exception_type on failure.

"""

def validate(filename, load_strategy=yaml.load):

if not os.path.exists(filename):

raise exception_type('File {0} does not exist'.format(filename))

file_contents = open(filename, 'r').read()

try:

obj = load_strategy(file_contents)

except Exception as e:

raise exception_type(

'Invalid yaml: {0}\n{1}'.format(os.path.relpath(filename), e),

)

try:

jsonschema.validate(obj, json_schema)

except jsonschema.exceptions.ValidationError as e:

raise exception_type(

'Invalid content: {0}\n{1}'.format(

os.path.relpath(filename), e

)

obj = apply_defaults(obj, json_schema)

additional_validation_strategy(obj)

return obj

return validate

def get_run_function(filenames_help, validate_strategy, exception_cls):

def run(argv=None):

argv = argv if argv is not None else sys.argv[1:]

parser = argparse.ArgumentParser()

parser.add_argument('filenames', nargs='*', help=filenames_help)

parser.add_argument(

'-V', '--version',

action='version',

version='%(prog)s {0}'.format(

pkg_resources.get_distribution('pre-commit').version

)

args = parser.parse_args(argv)

retval = 0

for filename in args.filenames:

try:

validate_strategy(filename)

except exception_cls as e:

print(e.args[0])

retval = 1

return retval

return run

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