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14506e8f5e
This adds a peek method for Utf8CodepointIterator, which enables it to be used in some parsing cases where peeking is necessary. peek(0) is equivalent to operator*, expect that peek() does not contain any assertions and will just return an empty Optional<u32>. This also implements a test case for iterating UTF-8.
106 lines
3.2 KiB
C++
106 lines
3.2 KiB
C++
/*
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* Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <AK/Utf8View.h>
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TEST_CASE(decode_ascii)
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{
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Utf8View utf8 { "Hello World!11" };
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EXPECT(utf8.validate());
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u32 expected[] = { 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 49, 49 };
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size_t expected_size = sizeof(expected) / sizeof(expected[0]);
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size_t i = 0;
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for (u32 code_point : utf8) {
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VERIFY(i < expected_size);
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EXPECT_EQ(code_point, expected[i]);
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i++;
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}
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EXPECT_EQ(i, expected_size);
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}
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TEST_CASE(decode_utf8)
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{
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Utf8View utf8 { "Привет, мир! 😀 γειά σου κόσμος こんにちは世界" };
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size_t valid_bytes;
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EXPECT(utf8.validate(valid_bytes));
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EXPECT(valid_bytes == (size_t)utf8.byte_length());
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u32 expected[] = { 1055, 1088, 1080, 1074, 1077, 1090, 44, 32, 1084, 1080, 1088, 33, 32, 128512, 32, 947, 949, 953, 940, 32, 963, 959, 965, 32, 954, 972, 963, 956, 959, 962, 32, 12371, 12435, 12395, 12385, 12399, 19990, 30028 };
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size_t expected_size = sizeof(expected) / sizeof(expected[0]);
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size_t i = 0;
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for (u32 code_point : utf8) {
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VERIFY(i < expected_size);
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EXPECT_EQ(code_point, expected[i]);
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i++;
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}
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EXPECT_EQ(i, expected_size);
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}
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TEST_CASE(validate_invalid_ut8)
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{
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size_t valid_bytes;
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char invalid_utf8_1[] = { 42, 35, (char)182, 9, 0 };
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Utf8View utf8_1 { invalid_utf8_1 };
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EXPECT(!utf8_1.validate(valid_bytes));
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EXPECT(valid_bytes == 2);
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char invalid_utf8_2[] = { 42, 35, (char)208, (char)208, 0 };
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Utf8View utf8_2 { invalid_utf8_2 };
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EXPECT(!utf8_2.validate(valid_bytes));
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EXPECT(valid_bytes == 2);
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char invalid_utf8_3[] = { (char)208, 0 };
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Utf8View utf8_3 { invalid_utf8_3 };
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EXPECT(!utf8_3.validate(valid_bytes));
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EXPECT(valid_bytes == 0);
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char invalid_utf8_4[] = { (char)208, 35, 0 };
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Utf8View utf8_4 { invalid_utf8_4 };
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EXPECT(!utf8_4.validate(valid_bytes));
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EXPECT(valid_bytes == 0);
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}
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TEST_CASE(iterate_utf8)
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{
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Utf8View view("Some weird characters \u00A9\u266A\uA755");
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Utf8CodepointIterator iterator = view.begin();
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EXPECT(*iterator == 'S');
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EXPECT(iterator.peek().has_value() && iterator.peek().value() == 'S');
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EXPECT(iterator.peek(0).has_value() && iterator.peek(0).value() == 'S');
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EXPECT(iterator.peek(1).has_value() && iterator.peek(1).value() == 'o');
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EXPECT(iterator.peek(22).has_value() && iterator.peek(22).value() == 0x00A9);
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EXPECT(iterator.peek(24).has_value() && iterator.peek(24).value() == 0xA755);
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EXPECT(!iterator.peek(25).has_value());
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++iterator;
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EXPECT(*iterator == 'o');
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EXPECT(iterator.peek(23).has_value() && iterator.peek(23).value() == 0xA755);
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for (size_t i = 0; i < 23; ++i)
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++iterator;
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EXPECT(!iterator.done());
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EXPECT(*iterator == 0xA755);
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EXPECT(iterator.peek().has_value() && iterator.peek().value() == 0xA755);
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EXPECT(!iterator.peek(1).has_value());
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++iterator;
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EXPECT(iterator.done());
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EXPECT(!iterator.peek(0).has_value());
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EXPECT_CRASH("Dereferencing Utf8CodepointIterator which is already done.", [&iterator] {
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*iterator;
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return Test::Crash::Failure::DidNotCrash;
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});
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}
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