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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/base/webui/i18n_source_stream.h"
#include <algorithm>
#include <utility>
#include "base/check.h"
#include "net/base/io_buffer.h"
namespace ui {
I18nSourceStream::~I18nSourceStream() {}
std::unique_ptr<I18nSourceStream> I18nSourceStream::Create(
std::unique_ptr<SourceStream> upstream,
net::SourceStreamType type,
const TemplateReplacements* replacements) {
DCHECK(replacements);
std::unique_ptr<I18nSourceStream> source(
new I18nSourceStream(std::move(upstream), type, replacements));
return source;
}
I18nSourceStream::I18nSourceStream(std::unique_ptr<SourceStream> upstream,
net::SourceStreamType type,
const TemplateReplacements* replacements)
: FilterSourceStream(type, std::move(upstream)),
replacements_(replacements) {}
std::string I18nSourceStream::GetTypeAsString() const {
return "i18n";
}
base::expected<size_t, net::Error> I18nSourceStream::FilterData(
net::IOBuffer* output_buffer,
size_t output_buffer_size,
net::IOBuffer* input_buffer,
size_t input_buffer_size,
size_t* consumed_bytes,
bool upstream_end_reached) {
// |input_| is often empty (or it may have something from the prior call).
input_.append(input_buffer->data(), input_buffer_size);
*consumed_bytes = input_buffer_size;
// The replacement tag starts with '$' and ends with '}'. The white-space
// characters are an optimization that looks for characters that are invalid
// within $i18n{} tags.
size_t pos = input_.find_last_of("$} \t\r\n");
std::string to_process;
if (!upstream_end_reached && pos != std::string::npos && input_[pos] == '$') {
// If there is a trailing '$' then split the |input_| at that point. Process
// the first part; save the second part for the next call to FilterData().
to_process.assign(input_, 0, pos);
input_.erase(0, pos);
} else {
// There is no risk of a split key, process the whole input.
to_process.swap(input_);
}
output_.append(ReplaceTemplateExpressions(to_process, *replacements_));
size_t bytes_out = std::min(output_.size(), output_buffer_size);
output_.copy(output_buffer->data(), bytes_out);
output_.erase(0, bytes_out);
return bytes_out;
}
} // namespace ui
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