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Diffstat (limited to 'src/third-party/scnlib/include/scn/reader/types.h')
| -rw-r--r-- | src/third-party/scnlib/include/scn/reader/types.h | 220 |
1 files changed, 220 insertions, 0 deletions
diff --git a/src/third-party/scnlib/include/scn/reader/types.h b/src/third-party/scnlib/include/scn/reader/types.h new file mode 100644 index 0000000..047d10d --- /dev/null +++ b/src/third-party/scnlib/include/scn/reader/types.h @@ -0,0 +1,220 @@ +// Copyright 2017 Elias Kosunen +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// +// This file is a part of scnlib: +// https://github.com/eliaskosunen/scnlib + +#ifndef SCN_READER_TYPES_H +#define SCN_READER_TYPES_H + +#include "int.h" + +namespace scn { + SCN_BEGIN_NAMESPACE + namespace detail { + struct code_point_scanner : common_parser { + static constexpr bool skip_preceding_whitespace() + { + return false; + } + + template <typename ParseCtx> + error parse(ParseCtx& pctx) + { + using char_type = typename ParseCtx::char_type; + + auto c_flag = detail::ascii_widen<char_type>('c'); + bool c_set{}; + return parse_common(pctx, span<const char_type>{&c_flag, 1}, + span<bool>{&c_set, 1}, + null_type_cb<ParseCtx>); + } + + template <typename Context> + error scan(code_point& val, Context& ctx) + { + unsigned char buf[4] = {0}; + auto cp = read_code_point(ctx.range(), make_span(buf, 4)); + if (!cp) { + return cp.error(); + } + val = cp.value().cp; + return {}; + } + }; + + struct bool_scanner : common_parser { + template <typename ParseCtx> + error parse(ParseCtx& pctx) + { + using char_type = typename ParseCtx::char_type; + + array<char_type, 3> options{{ + // Only strings + ascii_widen<char_type>('s'), + // Only ints + ascii_widen<char_type>('i'), + // Localized digits + ascii_widen<char_type>('n'), + }}; + bool flags[3] = {false}; + auto e = parse_common( + pctx, span<const char_type>{options.begin(), options.end()}, + span<bool>{flags, 3}, null_type_cb<ParseCtx>); + + if (!e) { + return e; + } + + format_options = 0; + // default ('s' + 'i') + if (!flags[0] && !flags[1]) { + format_options |= allow_string | allow_int; + } + // 's' + if (flags[0]) { + format_options |= allow_string; + } + // 'i' + if (flags[1]) { + format_options |= allow_int; + } + // 'n' + if (flags[2]) { + format_options |= localized_digits; + // 'n' implies 'L' + common_options |= localized; + } + return {}; + } + + template <typename Context> + error scan(bool& val, Context& ctx) + { + using char_type = typename Context::char_type; + + if ((format_options & allow_string) != 0) { + auto truename = ctx.locale().get_static().truename(); + auto falsename = ctx.locale().get_static().falsename(); + if ((common_options & localized) != 0) { + truename = ctx.locale().get_localized().truename(); + falsename = ctx.locale().get_localized().falsename(); + } + const auto max_len = + detail::max(truename.size(), falsename.size()); + std::basic_string<char_type> buf; + buf.reserve(max_len); + + auto tmp_it = std::back_inserter(buf); + auto is_space_pred = make_is_space_predicate( + ctx.locale(), (common_options & localized) != 0, + field_width); + auto e = read_until_space(ctx.range(), tmp_it, + is_space_pred, false); + if (!e) { + return e; + } + + bool found = false; + if (buf.size() >= falsename.size()) { + if (std::equal(falsename.begin(), falsename.end(), + buf.begin())) { + val = false; + found = true; + } + } + if (!found && buf.size() >= truename.size()) { + if (std::equal(truename.begin(), truename.end(), + buf.begin())) { + val = true; + found = true; + } + } + if (found) { + return {}; + } + else { + auto pb = + putback_n(ctx.range(), + static_cast<std::ptrdiff_t>(buf.size())); + if (!pb) { + return pb; + } + } + } + + if ((format_options & allow_int) != 0) { + if ((format_options & localized_digits) != 0) { + int i{}; + auto s = integer_scanner<int>{}; + s.common_options = integer_scanner<int>::localized; + s.format_options = + integer_scanner<int>::only_unsigned | + integer_scanner<int>::localized_digits; + auto e = s.scan(i, ctx); + if (!e) { + return e; + } + if (SCN_UNLIKELY(i != 0 && i != 1)) { + return { + error::invalid_scanned_value, + "Scanned integral boolean not equal to 0 or 1"}; + } + else if (i == 0) { + val = false; + } + else { + val = true; + } + return {}; + } + + unsigned char buf[4] = {0}; + auto cp = read_code_point(ctx.range(), make_span(buf, 4)); + if (!cp) { + return cp.error(); + } + if (cp.value().cp == detail::ascii_widen<char_type>('0')) { + val = false; + return {}; + } + if (cp.value().cp == detail::ascii_widen<char_type>('1')) { + val = true; + return {}; + } + auto pb = putback_n(ctx.range(), cp.value().chars.ssize()); + if (!pb) { + return pb; + } + } + + return {error::invalid_scanned_value, "Couldn't scan bool"}; + } + + enum format_options_type { + // 's' option + allow_string = 1, + // 'i' option + allow_int = 2, + // 'n' option + localized_digits = 4 + }; + uint8_t format_options{allow_string | allow_int}; + }; + + } // namespace detail + SCN_END_NAMESPACE +} // namespace scn + +#endif |