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Copy pathregex_match_step.cc
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71 lines (58 loc) · 2.41 KB
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// Copyright 2022 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 "eval/eval/regex_match_step.h"
#include <memory>
#include <utility>
#include "absl/status/status.h"
#include "base/values/string_value.h"
#include "eval/eval/expression_step_base.h"
#include "eval/internal/interop.h"
#include "re2/re2.h"
namespace google::api::expr::runtime {
namespace {
using ::cel::interop_internal::CreateBoolValue;
inline constexpr int kNumRegexMatchArguments = 1;
inline constexpr size_t kRegexMatchStepSubject = 0;
class RegexMatchStep final : public ExpressionStepBase {
public:
RegexMatchStep(int64_t expr_id, std::shared_ptr<const RE2> re2)
: ExpressionStepBase(expr_id, /*comes_from_ast=*/true),
re2_(std::move(re2)) {}
absl::Status Evaluate(ExecutionFrame* frame) const override {
if (!frame->value_stack().HasEnough(kNumRegexMatchArguments)) {
return absl::Status(absl::StatusCode::kInternal,
"Insufficient arguments supplied for regular "
"expression match");
}
auto input_args = frame->value_stack().GetSpan(kNumRegexMatchArguments);
const auto& subject = input_args[kRegexMatchStepSubject];
if (!subject->Is<cel::StringValue>()) {
return absl::Status(absl::StatusCode::kInternal,
"First argument for regular "
"expression match must be a string");
}
bool match = subject.As<cel::StringValue>()->Matches(*re2_);
frame->value_stack().Pop(kNumRegexMatchArguments);
frame->value_stack().Push(CreateBoolValue(match));
return absl::OkStatus();
}
private:
const std::shared_ptr<const RE2> re2_;
};
} // namespace
absl::StatusOr<std::unique_ptr<ExpressionStep>> CreateRegexMatchStep(
std::shared_ptr<const RE2> re2, int64_t expr_id) {
return std::make_unique<RegexMatchStep>(expr_id, std::move(re2));
}
} // namespace google::api::expr::runtime