111 lines
2.6 KiB
C++
111 lines
2.6 KiB
C++
//# This file is a part of toml++ and is subject to the the terms of the MIT license.
|
|
//# Copyright (c) 2019-2020 Mark Gillard <mark.gillard@outlook.com.au>
|
|
//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
|
|
// SPDX-License-Identifier: MIT
|
|
|
|
#pragma once
|
|
//# {{
|
|
#include "toml_preprocessor.h"
|
|
#if !TOML_IMPLEMENTATION
|
|
#error This is an implementation-only header.
|
|
#endif
|
|
#if !TOML_PARSER
|
|
#error This header cannot not be included when TOML_PARSER is disabled.
|
|
#endif
|
|
//# }}
|
|
|
|
#include "toml_utf8_streams.h"
|
|
|
|
#if !TOML_EXCEPTIONS
|
|
#undef TOML_ERROR_CHECK
|
|
#define TOML_ERROR_CHECK if (reader.error()) return nullptr
|
|
#endif
|
|
|
|
TOML_IMPL_NAMESPACE_START
|
|
{
|
|
TOML_ABI_NAMESPACE_BOOL(TOML_EXCEPTIONS, ex, noex)
|
|
|
|
TOML_EXTERNAL_LINKAGE
|
|
utf8_buffered_reader::utf8_buffered_reader(utf8_reader_interface& reader_) noexcept
|
|
: reader{ reader_ }
|
|
{}
|
|
|
|
TOML_EXTERNAL_LINKAGE
|
|
const source_path_ptr& utf8_buffered_reader::source_path() const noexcept
|
|
{
|
|
return reader.source_path();
|
|
}
|
|
|
|
TOML_EXTERNAL_LINKAGE
|
|
const utf8_codepoint* utf8_buffered_reader::read_next()
|
|
{
|
|
TOML_ERROR_CHECK;
|
|
|
|
if (negative_offset)
|
|
{
|
|
negative_offset--;
|
|
|
|
// an entry negative offset of 1 just means "replay the current head"
|
|
if (!negative_offset)
|
|
return head;
|
|
|
|
// otherwise step back into the history buffer
|
|
else
|
|
return history.buffer + ((history.first + history.count - negative_offset) % history_buffer_size);
|
|
}
|
|
else
|
|
{
|
|
// first character read from stream
|
|
if TOML_UNLIKELY(!history.count && !head)
|
|
head = reader.read_next();
|
|
|
|
// subsequent characters and not eof
|
|
else if (head)
|
|
{
|
|
if TOML_UNLIKELY(history.count < history_buffer_size)
|
|
history.buffer[history.count++] = *head;
|
|
else
|
|
history.buffer[(history.first++ + history_buffer_size) % history_buffer_size] = *head;
|
|
|
|
head = reader.read_next();
|
|
}
|
|
|
|
return head;
|
|
}
|
|
}
|
|
|
|
TOML_EXTERNAL_LINKAGE
|
|
const utf8_codepoint* utf8_buffered_reader::step_back(size_t count) noexcept
|
|
{
|
|
TOML_ERROR_CHECK;
|
|
TOML_ASSERT(history.count);
|
|
TOML_ASSERT(negative_offset + count <= history.count);
|
|
|
|
negative_offset += count;
|
|
|
|
return negative_offset
|
|
? history.buffer + ((history.first + history.count - negative_offset) % history_buffer_size)
|
|
: head;
|
|
}
|
|
|
|
TOML_EXTERNAL_LINKAGE
|
|
bool utf8_buffered_reader::peek_eof() const
|
|
{
|
|
return reader.peek_eof();
|
|
}
|
|
|
|
#if !TOML_EXCEPTIONS
|
|
TOML_EXTERNAL_LINKAGE
|
|
optional<parse_error>&& utf8_buffered_reader::error() noexcept
|
|
{
|
|
return reader.error();
|
|
}
|
|
#endif
|
|
|
|
TOML_ABI_NAMESPACE_END // TOML_EXCEPTIONS
|
|
}
|
|
TOML_IMPL_NAMESPACE_END
|
|
|
|
#undef TOML_ERROR_CHECK
|
|
#undef TOML_ERROR
|