101 lines
3.1 KiB
C
101 lines
3.1 KiB
C
|
// 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.
|
||
|
|
|
||
|
|
#ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_CHECKER_H_
|
||
|
|
#define ABSL_STRINGS_INTERNAL_STR_FORMAT_CHECKER_H_
|
||
|
|
|
||
|
|
#include <algorithm>
|
||
|
|
|
||
|
|
#include "absl/base/attributes.h"
|
||
|
|
#include "absl/strings/internal/str_format/arg.h"
|
||
|
|
#include "absl/strings/internal/str_format/constexpr_parser.h"
|
||
|
|
#include "absl/strings/internal/str_format/extension.h"
|
||
|
|
|
||
|
|
// Compile time check support for entry points.
|
||
|
|
|
||
|
|
#ifndef ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
|
||
|
|
// We disable format checker under vscode intellisense compilation.
|
||
|
|
// See https://github.com/microsoft/vscode-cpptools/issues/3683 for
|
||
|
|
// more details.
|
||
|
|
#if ABSL_HAVE_ATTRIBUTE(enable_if) && !defined(__native_client__) && \
|
||
|
|
!defined(__INTELLISENSE__)
|
||
|
|
#define ABSL_INTERNAL_ENABLE_FORMAT_CHECKER 1
|
||
|
|
#endif // ABSL_HAVE_ATTRIBUTE(enable_if) && !defined(__native_client__) &&
|
||
|
|
// !defined(__INTELLISENSE__)
|
||
|
|
#endif // ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
|
||
|
|
|
||
|
|
namespace absl {
|
||
|
|
ABSL_NAMESPACE_BEGIN
|
||
|
|
namespace str_format_internal {
|
||
|
|
|
||
|
|
#ifdef ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
|
||
|
|
|
||
|
|
template <FormatConversionCharSet... C>
|
||
|
|
constexpr bool ValidFormatImpl(string_view format) {
|
||
|
|
int next_arg = 0;
|
||
|
|
const char* p = format.data();
|
||
|
|
const char* const end = p + format.size();
|
||
|
|
constexpr FormatConversionCharSet
|
||
|
|
kAllowedConvs[(std::max)(sizeof...(C), size_t{1})] = {C...};
|
||
|
|
bool used[(std::max)(sizeof...(C), size_t{1})]{};
|
||
|
|
constexpr int kNumArgs = sizeof...(C);
|
||
|
|
while (p != end) {
|
||
|
|
while (p != end && *p != '%') ++p;
|
||
|
|
if (p == end) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if (p + 1 >= end) return false;
|
||
|
|
if (p[1] == '%') {
|
||
|
|
// %%
|
||
|
|
p += 2;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
UnboundConversion conv(absl::kConstInit);
|
||
|
|
p = ConsumeUnboundConversion(p + 1, end, &conv, &next_arg);
|
||
|
|
if (p == nullptr) return false;
|
||
|
|
if (conv.arg_position <= 0 || conv.arg_position > kNumArgs) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
if (!Contains(kAllowedConvs[conv.arg_position - 1], conv.conv)) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
used[conv.arg_position - 1] = true;
|
||
|
|
for (auto extra : {conv.width, conv.precision}) {
|
||
|
|
if (extra.is_from_arg()) {
|
||
|
|
int pos = extra.get_from_arg();
|
||
|
|
if (pos <= 0 || pos > kNumArgs) return false;
|
||
|
|
used[pos - 1] = true;
|
||
|
|
if (!Contains(kAllowedConvs[pos - 1], '*')) {
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (sizeof...(C) != 0) {
|
||
|
|
for (bool b : used) {
|
||
|
|
if (!b) return false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif // ABSL_INTERNAL_ENABLE_FORMAT_CHECKER
|
||
|
|
|
||
|
|
} // namespace str_format_internal
|
||
|
|
ABSL_NAMESPACE_END
|
||
|
|
} // namespace absl
|
||
|
|
|
||
|
|
#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_CHECKER_H_
|