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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef builtin_intl_CommonFunctions_h
#define builtin_intl_CommonFunctions_h
#include "mozilla/Assertions.h"
#include "mozilla/TypeTraits.h"
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include "builtin/intl/ICUHeader.h"
#include "js/RootingAPI.h"
#include "js/Vector.h"
#include "vm/String.h"
#include "jscntxt.h"
namespace JS { class Value; }
class JSObject;
namespace js {
namespace intl {
/**
* Initialize a new Intl.* object using the named self-hosted function.
*/
extern bool
InitializeObject(JSContext* cx, HandleObject obj, Handle<PropertyName*> initializer,
HandleValue locales, HandleValue options);
/**
* Initialize an existing object as an Intl.* object using the named
* self-hosted function. This is only for a few old Intl.* constructors, for
* legacy reasons -- new ones should use the function above instead.
*/
enum class DateTimeFormatOptions
{
Standard,
EnableMozExtensions,
};
extern bool
LegacyIntlInitialize(JSContext* cx, HandleObject obj, Handle<PropertyName*> initializer,
HandleValue thisValue, HandleValue locales, HandleValue options,
DateTimeFormatOptions dtfOptions, MutableHandleValue result);
/**
* Returns the object holding the internal properties for obj.
*/
extern JSObject*
GetInternalsObject(JSContext* cx, JS::Handle<JSObject*> obj);
/** Report an Intl internal error not directly tied to a spec step. */
extern void
ReportInternalError(JSContext* cx);
static inline bool
StringsAreEqual(const char* s1, const char* s2)
{
return !strcmp(s1, s2);
}
static inline bool
StringsAreEqual(JSAutoByteString& s1, const char* s2)
{
return !strcmp(s1.ptr(), s2);
}
/**
* The last-ditch locale is used if none of the available locales satisfies a
* request. "en-GB" is used based on the assumptions that English is the most
* common second language, that both en-GB and en-US are normally available in
* an implementation, and that en-GB is more representative of the English used
* in other locales.
*/
static inline const char* LastDitchLocale() { return "en-GB"; }
/**
* Certain old, commonly-used language tags that lack a script, are expected to
* nonetheless imply one. This object maps these old-style tags to modern
* equivalents.
*/
struct OldStyleLanguageTagMapping {
const char* const oldStyle;
const char* const modernStyle;
// Provide a constructor to catch missing initializers in the mappings array.
constexpr OldStyleLanguageTagMapping(const char* oldStyle,
const char* modernStyle)
: oldStyle(oldStyle), modernStyle(modernStyle) {}
};
extern const OldStyleLanguageTagMapping oldStyleLanguageTagMappings[5];
static inline const char*
IcuLocale(const char* locale)
{
if (StringsAreEqual(locale, "und"))
return ""; // ICU root locale
return locale;
}
// Starting with ICU 59, UChar defaults to char16_t.
static_assert(mozilla::IsSame<UChar, char16_t>::value,
"SpiderMonkey doesn't support redefining UChar to a different type");
// The inline capacity we use for a Vector<char16_t>. Use this to ensure that
// our uses of ICU string functions, below and elsewhere, will try to fill the
// buffer's entire inline capacity before growing it and heap-allocating.
static const size_t INITIAL_CHAR_BUFFER_SIZE = 32;
template <typename ICUStringFunction, typename CharT, size_t InlineCapacity>
static int32_t
CallICU(JSContext* cx, Vector<CharT, InlineCapacity>& chars, const ICUStringFunction& strFn)
{
MOZ_ASSERT(chars.length() == 0);
MOZ_ALWAYS_TRUE(chars.resize(InlineCapacity));
UErrorCode status = U_ZERO_ERROR;
int32_t size = strFn(chars.begin(), InlineCapacity, &status);
if (status == U_BUFFER_OVERFLOW_ERROR) {
MOZ_ASSERT(size >= 0);
if (!chars.resize(size_t(size)))
return -1;
status = U_ZERO_ERROR;
strFn(chars.begin(), size, &status);
}
if (U_FAILURE(status)) {
ReportInternalError(cx);
return -1;
}
MOZ_ASSERT(size >= 0);
if (!chars.resize(size_t(size)))
return -1;
return size;
}
template <typename ICUStringFunction>
static JSString*
CallICU(JSContext* cx, const ICUStringFunction& strFn)
{
Vector<char16_t, INITIAL_CHAR_BUFFER_SIZE> chars(cx);
int32_t size = CallICU(cx, chars, strFn);
if (size < 0)
return nullptr;
return NewStringCopyN<CanGC>(cx, chars.begin(), size_t(size));
}
} // namespace intl
} // namespace js
#endif /* builtin_intl_CommonFunctions_h */
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