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/* 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 intl_components_FormatBuffer_h
#define intl_components_FormatBuffer_h
/**
* This file contains public adaptors for the mozilla::intl Buffer template
* argument. Adaptors that can automatically be deduced are kept as private
* in ICU4CGlue.h. There is also the SpiderMonkey specific adaptor
* js::intl::FormatBuffer in js/src/builtin/intl/FormatBuffer.h.
*/
#include "nsTString.h"
namespace mozilla::intl {
/**
* mozilla::intl APIs require sizeable buffers. This class abstracts over
* the nsTSubstring.
*/
template <typename T>
class nsTStringToBufferAdapter {
public:
using CharType = T;
// Do not allow copy or move. Move could be added in the future if needed.
nsTStringToBufferAdapter(const nsTStringToBufferAdapter&) = delete;
nsTStringToBufferAdapter& operator=(const nsTStringToBufferAdapter&) = delete;
explicit nsTStringToBufferAdapter(nsTSubstring<CharType>& aString)
: mString(aString) {}
/**
* Ensures the buffer has enough space to accommodate |size| elements.
*/
[[nodiscard]] bool reserve(size_t size) {
return mString.SetLength(size, fallible);
}
/**
* Returns the raw data inside the buffer.
*/
CharType* data() { return mString.BeginWriting(); }
/**
* Returns the count of elements written into the buffer.
*/
size_t length() const { return mString.Length(); }
/**
* Returns the buffer's overall capacity.
*/
size_t capacity() const {
// nsString's Capacity() method is protected, so just return the length.
return mString.Length();
}
/**
* Resizes the buffer to the given amount of written elements.
*/
void written(size_t amount) {
MOZ_ASSERT(amount <= mString.Length());
// This sets |mString|'s internal size so that it matches how much was
// written. This is necessary because the write happens across FFI
// boundaries.
mString.SetLength(amount);
}
private:
nsTSubstring<CharType>& mString;
};
} // namespace mozilla::intl
#endif /* intl_components_FormatBuffer_h */
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