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// Copyright 2021 Google LLC
//
// 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 "internal/lexis.h"
#include "absl/base/call_once.h"
#include "absl/base/macros.h"
#include "absl/container/flat_hash_set.h"
#include "absl/strings/ascii.h"
namespace cel::internal {
namespace {
ABSL_CONST_INIT absl::once_flag reserved_keywords_once_flag = {};
ABSL_CONST_INIT absl::flat_hash_set<absl::string_view>* reserved_keywords =
nullptr;
void InitializeReservedKeywords() {
ABSL_ASSERT(reserved_keywords == nullptr);
reserved_keywords = new absl::flat_hash_set<absl::string_view>();
reserved_keywords->insert("false");
reserved_keywords->insert("true");
reserved_keywords->insert("null");
reserved_keywords->insert("in");
reserved_keywords->insert("as");
reserved_keywords->insert("break");
reserved_keywords->insert("const");
reserved_keywords->insert("continue");
reserved_keywords->insert("else");
reserved_keywords->insert("for");
reserved_keywords->insert("function");
reserved_keywords->insert("if");
reserved_keywords->insert("import");
reserved_keywords->insert("let");
reserved_keywords->insert("loop");
reserved_keywords->insert("package");
reserved_keywords->insert("namespace");
reserved_keywords->insert("return");
reserved_keywords->insert("var");
reserved_keywords->insert("void");
reserved_keywords->insert("while");
}
} // namespace
bool LexisIsReserved(absl::string_view text) {
absl::call_once(reserved_keywords_once_flag, InitializeReservedKeywords);
return reserved_keywords->find(text) != reserved_keywords->end();
}
bool LexisIsIdentifier(absl::string_view text) {
if (text.empty()) {
return false;
}
char first = text.front();
if (!absl::ascii_isalpha(first) && first != '_') {
return false;
}
for (size_t index = 1; index < text.size(); index++) {
if (!absl::ascii_isalnum(text[index]) && text[index] != '_') {
return false;
}
}
return !LexisIsReserved(text);
}
} // namespace cel::internal