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AK: Add a Utf8View type for iterating over UTF-8 codepoints

Utf8View wraps a StringView and implements begin() and end() that
return a Utf8CodepointIterator, which parses UTF-8-encoded Unicode
codepoints and returns them as 32-bit integers.

This is the first step towards supporting emojis in Serenity ^)
https://github.com/SerenityOS/serenity/issues/490
This commit is contained in:
Sergey Bugaev 2019-08-28 00:57:15 +03:00 committed by Andreas Kling
parent 970e0147f7
commit 5d3696174b
4 changed files with 241 additions and 1 deletions

View file

@ -1,4 +1,4 @@
PROGRAMS = TestString TestQueue TestVector TestHashMap TestJSON TestWeakPtr TestNonnullRefPtr TestRefPtr TestFixedArray TestFileSystemPath TestURL TestStringView
PROGRAMS = TestString TestQueue TestVector TestHashMap TestJSON TestWeakPtr TestNonnullRefPtr TestRefPtr TestFixedArray TestFileSystemPath TestURL TestStringView TestUtf8
CXXFLAGS = -std=c++17 -Wall -Wextra -ggdb3 -O2 -I../ -I../../
@ -14,6 +14,7 @@ SHARED_TEST_OBJS = \
../JsonParser.o \
../FileSystemPath.o \
../URL.o \
../Utf8View.o \
.cpp.o:
@echo "HOST_CXX $<"; $(PRE_CXX) $(CXX) $(CXXFLAGS) -o $@ -c $<
@ -65,6 +66,9 @@ TestURL: TestURL.o $(SHARED_TEST_OBJS)
TestStringView: TestStringView.o $(SHARED_TEST_OBJS)
$(PRE_CXX) $(CXX) $(CXXFLAGS) -o $@ TestStringView.o $(SHARED_TEST_OBJS)
TestUtf8: TestUtf8.o $(SHARED_TEST_OBJS)
$(PRE_CXX) $(CXX) $(CXXFLAGS) -o $@ TestUtf8.o $(SHARED_TEST_OBJS)
clean:
rm -f $(SHARED_TEST_OBJS)
rm -f $(PROGRAMS)

58
AK/Tests/TestUtf8.cpp Normal file
View file

@ -0,0 +1,58 @@
#include <AK/TestSuite.h>
#include <AK/Utf8View.h>
TEST_CASE(decode_ascii)
{
Utf8View utf8 { "Hello World!11" };
EXPECT(utf8.validate());
u32 expected[] = { 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33, 49, 49 };
size_t expected_size = sizeof(expected) / sizeof(expected[0]);
size_t i = 0;
for (u32 codepoint : utf8) {
ASSERT(i < expected_size);
EXPECT_EQ(codepoint, expected[i]);
i++;
}
EXPECT_EQ(i, expected_size);
}
TEST_CASE(decode_utf8)
{
Utf8View utf8 { "Привет, мир! 😀 γειά σου κόσμος こんにちは世界" };
EXPECT(utf8.validate());
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 };
size_t expected_size = sizeof(expected) / sizeof(expected[0]);
size_t i = 0;
for (u32 codepoint : utf8) {
ASSERT(i < expected_size);
EXPECT_EQ(codepoint, expected[i]);
i++;
}
EXPECT_EQ(i, expected_size);
}
TEST_CASE(validate_invalid_ut8)
{
char invalid_utf8_1[] = { 42, 35, (char)182, 9, 0 };
Utf8View utf8_1 { invalid_utf8_1 };
EXPECT(!utf8_1.validate());
char invalid_utf8_2[] = { 42, 35, (char)208, (char)208, 0 };
Utf8View utf8_2 { invalid_utf8_2 };
EXPECT(!utf8_2.validate());
char invalid_utf8_3[] = { (char)208, 0 };
Utf8View utf8_3 { invalid_utf8_3 };
EXPECT(!utf8_3.validate());
char invalid_utf8_4[] = { (char)208, 35, 0 };
Utf8View utf8_4 { invalid_utf8_4 };
EXPECT(!utf8_4.validate());
}
TEST_MAIN(UTF8)