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Copy pathPlatformUnicodeJava.cpp
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163 lines (133 loc) · 5.18 KB
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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#include "hermes/Platform/Unicode/PlatformUnicode.h"
#if HERMES_PLATFORM_UNICODE == HERMES_PLATFORM_UNICODE_JAVA
#include <fbjni/fbjni.h>
namespace hermes {
namespace platform_unicode {
using namespace facebook::jni;
namespace {
void copyStringTo(
JNIEnv *env,
local_ref<jstring> jstr,
llvh::SmallVectorImpl<char16_t> &buf) {
jsize len = env->GetStringLength(jstr.get());
const jchar *chr = env->GetStringChars(jstr.get(), nullptr);
buf.assign(chr, chr + len);
env->ReleaseStringChars(jstr.get(), chr);
}
/// Converts a SmallVector of char16_t into a Java \c String.
/// \p env The JNI environment to create the string in.
/// \p str The string to copy into the Java Heap.
/// \return the resulting string.
local_ref<JString> toJavaString(JNIEnv *env, llvh::ArrayRef<char16_t> str) {
static_assert(
sizeof(jchar) == sizeof(*str.data()),
"UTF16 char not the same size as Java char.");
auto jStr = adopt_local(
env->NewString(reinterpret_cast<const jchar *>(str.data()), str.size()));
FACEBOOK_JNI_THROW_PENDING_EXCEPTION();
return jStr;
}
} // anonymous namespace
/// Provides JNI bindings for using existing Android APIs to perform
/// unicode-related tasks.
/// NOTE: All public exports from this header should be marked `noexcept`.
class JAndroidUnicodeUtils
: public facebook::jni::JavaClass<JAndroidUnicodeUtils> {
/// Abort if there exists a pending Java exception. This throws the Java
/// exception out of a noexcept handler, which will call std::terminate().
static void abortOnJavaException() noexcept {
FACEBOOK_JNI_THROW_PENDING_EXCEPTION();
}
public:
static auto constexpr kJavaDescriptor =
"Lcom/facebook/hermes/unicode/AndroidUnicodeUtils;";
/// Compares two strings using the user's chosen locale to order chars.
/// Equivalent of left.localeCompare(right) in JS.
static jint localeCompare(
llvh::ArrayRef<char16_t> left,
llvh::ArrayRef<char16_t> right) noexcept {
const auto env = facebook::jni::Environment::current();
auto jLeft = toJavaString(env, left);
auto jRight = toJavaString(env, right);
static const auto jLocaleCompare =
javaClassStatic()->getStaticMethod<jint(jstring, jstring)>(
"localeCompare");
return jLocaleCompare(javaClassStatic(), jLeft.get(), jRight.get());
}
static void dateFormat(
double unixtimeMs,
bool formatDate,
bool formatTime,
llvh::SmallVectorImpl<char16_t> &buf) noexcept {
const auto env = facebook::jni::Environment::current();
static const auto jDateFormat =
javaClassStatic()
->getStaticMethod<jstring(jdouble, jboolean, jboolean)>(
"dateFormat");
local_ref<jstring> javaFormattedDate =
jDateFormat(javaClassStatic(), unixtimeMs, formatDate, formatTime);
FACEBOOK_JNI_THROW_PENDING_EXCEPTION();
jsize len = env->GetStringLength(javaFormattedDate.get());
const jchar *chr = env->GetStringChars(javaFormattedDate.get(), nullptr);
buf.append(chr, chr + len);
env->ReleaseStringChars(javaFormattedDate.get(), chr);
}
static void convertToCase(
llvh::SmallVectorImpl<char16_t> &buf,
CaseConversion targetCase,
bool useCurrentLocale) noexcept {
const auto env = facebook::jni::Environment::current();
static const auto jConvertCase =
javaClassStatic()->getStaticMethod<jstring(jstring, int, jboolean)>(
"convertToCase");
auto jInput = toJavaString(env, buf);
int targetCaseInt = static_cast<int>(targetCase);
local_ref<jstring> javaConvertedCase = jConvertCase(
javaClassStatic(), jInput.get(), targetCaseInt, useCurrentLocale);
abortOnJavaException();
copyStringTo(env, javaConvertedCase, buf);
}
static void normalize(
llvh::SmallVectorImpl<char16_t> &buf,
NormalizationForm form) noexcept {
const auto env = facebook::jni::Environment::current();
static const auto jNormalize =
javaClassStatic()->getStaticMethod<jstring(jstring, int)>("normalize");
auto jInput = toJavaString(env, buf);
int formInt = static_cast<int>(form);
local_ref<jstring> javaNormalized =
jNormalize(javaClassStatic(), jInput.get(), formInt);
abortOnJavaException();
copyStringTo(env, javaNormalized, buf);
}
};
int localeCompare(
llvh::ArrayRef<char16_t> left,
llvh::ArrayRef<char16_t> right) {
return JAndroidUnicodeUtils::localeCompare(left, right);
}
void dateFormat(
double unixtimeMs,
bool formatDate,
bool formatTime,
llvh::SmallVectorImpl<char16_t> &buf) {
JAndroidUnicodeUtils::dateFormat(unixtimeMs, formatDate, formatTime, buf);
}
void convertToCase(
llvh::SmallVectorImpl<char16_t> &str,
CaseConversion targetCase,
bool useCurrentLocale) {
JAndroidUnicodeUtils::convertToCase(str, targetCase, useCurrentLocale);
}
void normalize(llvh::SmallVectorImpl<char16_t> &buf, NormalizationForm form) {
JAndroidUnicodeUtils::normalize(buf, form);
}
} // namespace platform_unicode
} // namespace hermes
#endif // HERMES_PLATFORM_UNICODE_JAVA