mirror of
https://github.com/marzer/tomlplusplus.git
synced 2025-02-24 12:41:05 +00:00
ca76e5d571
- moved implementation-only headers to `/impl` - replaced `[[nodiscard]]` with `TOML_NODISCARD` - added `.clang-format` + applied to all files also: - added support for Unicode 14.0 - fixed minor documentation issues - version bump (pre-emptive for next release)
117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
//# This file is a part of toml++ and is subject to the the terms of the MIT license.
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//# Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
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//# See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
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// SPDX-License-Identifier: MIT
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#pragma once
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//# {{
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#include "preprocessor.h"
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#if !TOML_IMPLEMENTATION
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#error This is an implementation-only header.
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#endif
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#if !TOML_PARSER
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#error This header cannot not be included when TOML_PARSER is disabled.
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#endif
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//# }}
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#include "utf8_streams.h"
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/// \cond
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#if !TOML_EXCEPTIONS
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#undef TOML_ERROR_CHECK
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#define TOML_ERROR_CHECK \
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if (reader.error()) \
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return nullptr
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#else
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#define TOML_ERROR_CHECK (void)0
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#endif
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TOML_IMPL_NAMESPACE_START
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{
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TOML_ABI_NAMESPACE_BOOL(TOML_EXCEPTIONS, ex, noex);
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TOML_EXTERNAL_LINKAGE
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utf8_buffered_reader::utf8_buffered_reader(utf8_reader_interface & reader_) noexcept : reader{ reader_ }
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{}
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TOML_EXTERNAL_LINKAGE
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const source_path_ptr& utf8_buffered_reader::source_path() const noexcept
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{
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return reader.source_path();
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}
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TOML_EXTERNAL_LINKAGE
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const utf8_codepoint* utf8_buffered_reader::read_next()
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{
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TOML_ERROR_CHECK;
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if (negative_offset)
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{
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negative_offset--;
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// an entry negative offset of 1 just means "replay the current head"
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if (!negative_offset)
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return head;
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// otherwise step back into the history buffer
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else
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return history.buffer + ((history.first + history.count - negative_offset) % history_buffer_size);
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}
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else
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{
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// first character read from stream
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if TOML_UNLIKELY(!history.count && !head)
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head = reader.read_next();
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// subsequent characters and not eof
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else if (head)
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{
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if TOML_UNLIKELY(history.count < history_buffer_size)
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history.buffer[history.count++] = *head;
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else
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history.buffer[(history.first++ + history_buffer_size) % history_buffer_size] = *head;
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head = reader.read_next();
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}
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return head;
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}
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}
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TOML_EXTERNAL_LINKAGE
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const utf8_codepoint* utf8_buffered_reader::step_back(size_t count) noexcept
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{
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TOML_ERROR_CHECK;
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TOML_ASSERT(history.count);
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TOML_ASSERT(negative_offset + count <= history.count);
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negative_offset += count;
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return negative_offset
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? history.buffer + ((history.first + history.count - negative_offset) % history_buffer_size)
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: head;
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}
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TOML_EXTERNAL_LINKAGE
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bool utf8_buffered_reader::peek_eof() const
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{
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return reader.peek_eof();
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}
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#if !TOML_EXCEPTIONS
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TOML_EXTERNAL_LINKAGE
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optional<parse_error>&& utf8_buffered_reader::error() noexcept
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{
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return reader.error();
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}
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#endif
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TOML_ABI_NAMESPACE_END; // TOML_EXCEPTIONS
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}
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TOML_IMPL_NAMESPACE_END;
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#undef TOML_ERROR_CHECK
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/// \endcond
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