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// Copyright 2020 The Abseil Authors.
//
// 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.
#include "absl/strings/internal/str_format/parser.h"
#include <assert.h>
#include <string.h>
#include <wchar.h>
#include <cctype>
#include <cstdint>
#include <algorithm>
#include <initializer_list>
#include <limits>
#include <ostream>
#include <string>
#include <unordered_set>
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace str_format_internal {
// Define the array for non-constexpr uses.
constexpr ConvTag ConvTagHolder::value[256];
ABSL_ATTRIBUTE_NOINLINE const char* ConsumeUnboundConversionNoInline(
const char* p, const char* end, UnboundConversion* conv, int* next_arg) {
return ConsumeUnboundConversion(p, end, conv, next_arg);
}
std::string LengthModToString(LengthMod v) {
switch (v) {
case LengthMod::h:
return "h";
case LengthMod::hh:
return "hh";
case LengthMod::l:
return "l";
case LengthMod::ll:
return "ll";
case LengthMod::L:
return "L";
case LengthMod::j:
return "j";
case LengthMod::z:
return "z";
case LengthMod::t:
return "t";
case LengthMod::q:
return "q";
case LengthMod::none:
return "";
}
return "";
}
struct ParsedFormatBase::ParsedFormatConsumer {
explicit ParsedFormatConsumer(ParsedFormatBase *parsedformat)
: parsed(parsedformat), data_pos(parsedformat->data_.get()) {}
bool Append(string_view s) {
if (s.empty()) return true;
size_t text_end = AppendText(s);
if (!parsed->items_.empty() && !parsed->items_.back().is_conversion) {
// Let's extend the existing text run.
parsed->items_.back().text_end = text_end;
} else {
// Let's make a new text run.
parsed->items_.push_back({false, text_end, {}});
}
return true;
}
bool ConvertOne(const UnboundConversion &conv, string_view s) {
size_t text_end = AppendText(s);
parsed->items_.push_back({true, text_end, conv});
return true;
}
size_t AppendText(string_view s) {
memcpy(data_pos, s.data(), s.size());
data_pos += s.size();
return static_cast<size_t>(data_pos - parsed->data_.get());
}
ParsedFormatBase *parsed;
char* data_pos;
};
ParsedFormatBase::ParsedFormatBase(
string_view format, bool allow_ignored,
std::initializer_list<FormatConversionCharSet> convs)
: data_(format.empty() ? nullptr : new char[format.size()]) {
has_error_ = !ParseFormatString(format, ParsedFormatConsumer(this)) ||
!MatchesConversions(allow_ignored, convs);
}
bool ParsedFormatBase::MatchesConversions(
bool allow_ignored,
std::initializer_list<FormatConversionCharSet> convs) const {
std::unordered_set<int> used;
auto add_if_valid_conv = [&](int pos, char c) {
if (static_cast<size_t>(pos) > convs.size() ||
!Contains(convs.begin()[pos - 1], c))
return false;
used.insert(pos);
return true;
};
for (const ConversionItem &item : items_) {
if (!item.is_conversion) continue;
auto &conv = item.conv;
if (conv.precision.is_from_arg() &&
!add_if_valid_conv(conv.precision.get_from_arg(), '*'))
return false;
if (conv.width.is_from_arg() &&
!add_if_valid_conv(conv.width.get_from_arg(), '*'))
return false;
if (!add_if_valid_conv(conv.arg_position,
FormatConversionCharToChar(conv.conv)))
return false;
}
return used.size() == convs.size() || allow_ignored;
}
} // namespace str_format_internal
ABSL_NAMESPACE_END
} // namespace absl
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