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#!/bin/python
from glob import glob
from os.path import isdir
from sys import argv
from typing import List
import argparse
from charset_normalizer import from_path, __version__
from charset_normalizer.utils import iana_name
from os import sep
def calc_equivalence(content: bytes, cp_a: str, cp_b: str):
str_a = content.decode(cp_a)
str_b = content.decode(cp_b)
character_count = len(str_a)
diff_character_count = sum(
chr_a != chr_b for chr_a, chr_b in zip(str_a, str_b)
)
return 1. - (diff_character_count / character_count)
def cli_coverage(arguments: List[str]):
parser = argparse.ArgumentParser(
description="Embedded detection success coverage script checker for Charset-Normalizer"
)
parser.add_argument('-p', '--with-preemptive', action="store_true", default=False, dest='preemptive',
help='Enable the preemptive scan behaviour during coverage check')
parser.add_argument('-c', '--coverage', action="store", default=90, type=int, dest='coverage',
help="Define the minimum acceptable coverage to succeed")
args = parser.parse_args(arguments)
if not isdir("./char-dataset"):
print("This script require https://github.com/Ousret/char-dataset to be cloned on package root directory")
exit(1)
print(f"> using charset-normalizer {__version__}")
success_count = 0
total_count = 0
for tbt_path in sorted(glob("./char-dataset/**/*.*")):
expected_encoding = tbt_path.split(sep)[-2]
total_count += 1
results = from_path(
tbt_path,
preemptive_behaviour=args.preemptive
)
if expected_encoding == "None" and len(results) == 0:
print("✅✅ '{}'".format(tbt_path))
success_count += 1
continue
if len(results) == 0:
print("⚡⚡ '{}' (nothing)".format(tbt_path))
continue
result = results.best()
if expected_encoding in result.could_be_from_charset or iana_name(expected_encoding) in result.could_be_from_charset:
print("✅✅ '{}'".format(tbt_path))
success_count += 1
continue
calc_eq = calc_equivalence(result.raw, expected_encoding, result.encoding)
if calc_eq >= 0.98:
success_count += 1
print("️✅ ️'{}' (got '{}' but equivalence {} %)".format(tbt_path, result.encoding, round(calc_eq * 100., 3)))
continue
print("⚡ '{}' (got '{}')".format(tbt_path, result.encoding))
success_ratio = round(success_count / total_count, 2) * 100.
print("Total EST coverage = {} % ({} / {} files)".format(success_ratio, success_count, total_count))
return 0 if success_ratio >= args.coverage else 1
if __name__ == "__main__":
exit(
cli_coverage(
argv[1:]
)
)