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#!/usr/bin/env python3
# Copyright 2020 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
"""Generates test data for hash_test.cc."""
import datetime
import os
import random
from pw_tokenizer import tokens
HASH_LENGTHS = 80, 96, 128
HASH_MACRO = 'PW_TOKENIZER_65599_FIXED_LENGTH_{}_HASH'
FILE_HEADER = """\
// Copyright {year} The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
// AUTOGENERATED - DO NOT EDIT
//
// This file was generated by {script}.
// To make changes, update the script and run it to generate new files.
#pragma once
#include <cstddef>
#include <cstdint>
#include <string_view>
{includes}
namespace pw::tokenizer {{
// Test a series of generated test cases.
inline constexpr struct {{
std::string_view string;
size_t hash_length;
uint32_t python_calculated_hash;
uint32_t macro_calculated_hash; // clang-format off
}} kHashTests[] = {{
"""
FILE_FOOTER = """
}; // kHashTests
// clang-format on
} // namespace pw::tokenizer
"""
_TEST_CASE = """{{
std::string_view("{str}", {string_length}u),
{hash_length}u, // fixed hash length
UINT32_C({hash}), // Python-calculated hash
{macro}("{str}"), // macro-calculated hash
}},
"""
def _include_paths(lengths):
return '\n'.join(
sorted(
'#include "pw_tokenizer/internal/'
'pw_tokenizer_65599_fixed_length_{}_hash_macro.h"'.format(length)
for length in lengths))
def _test_case_at_length(data, hash_length):
"""Generates a test case for a particular hash length."""
if isinstance(data, str):
data = data.encode()
if all(ord(' ') <= b <= ord('~') for b in data):
escaped_str = data.decode().replace('"', r'\"')
else:
escaped_str = ''.join(r'\x{:02x}'.format(b) for b in data)
return _TEST_CASE.format(str=escaped_str,
string_length=len(data),
hash_length=hash_length,
hash=tokens.pw_tokenizer_65599_hash(
data, hash_length),
macro=HASH_MACRO.format(hash_length))
def test_case(data):
return ''.join(
_test_case_at_length(data, length) for length in (80, 96, 128))
def generate_test_cases():
yield test_case('')
yield test_case(b'\xa1')
yield test_case(b'\xff')
yield test_case('\0')
yield test_case('\0\0')
yield test_case('a')
yield test_case('A')
yield test_case('hello, "world"')
yield test_case('YO' * 100)
random.seed(600613)
random_string = lambda size: bytes(
random.randrange(256) for _ in range(size))
for i in range(1, 16):
yield test_case(random_string(i))
yield test_case(random_string(i))
for length in HASH_LENGTHS:
yield test_case(random_string(length - 1))
yield test_case(random_string(length))
yield test_case(random_string(length + 1))
if __name__ == '__main__':
path = os.path.realpath(
os.path.join(os.path.dirname(__file__), '..', 'pw_tokenizer_private',
'generated_hash_test_cases.h'))
with open(path, 'w') as output:
output.write(
FILE_HEADER.format(year=datetime.date.today().year,
script=os.path.basename(__file__),
includes=_include_paths(HASH_LENGTHS)))
for case in generate_test_cases():
output.write(case)
output.write(FILE_FOOTER)
print('Wrote test data to', path)
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