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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
//
// http://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.
package interpreter
import (
"regexp"
"github.com/google/cel-go/common/types"
"github.com/google/cel-go/common/types/ref"
)
// MatchesRegexOptimization optimizes the 'matches' standard library function by compiling the regex pattern and
// reporting any compilation errors at program creation time, and using the compiled regex pattern for all function
// call invocations.
var MatchesRegexOptimization = &RegexOptimization{
Function: "matches",
RegexIndex: 1,
Factory: func(call InterpretableCall, regexPattern string) (InterpretableCall, error) {
compiledRegex, err := regexp.Compile(regexPattern)
if err != nil {
return nil, err
}
return NewCall(call.ID(), call.Function(), call.OverloadID(), call.Args(), func(values ...ref.Val) ref.Val {
if len(values) != 2 {
return types.NoSuchOverloadErr()
}
in, ok := values[0].Value().(string)
if !ok {
return types.NoSuchOverloadErr()
}
return types.Bool(compiledRegex.MatchString(in))
}), nil
},
}
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