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47 lines
1.5 KiB
Go
47 lines
1.5 KiB
Go
// Copyright 2022 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package interpreter
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import (
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"regexp"
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"github.com/google/cel-go/common/types"
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"github.com/google/cel-go/common/types/ref"
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)
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// MatchesRegexOptimization optimizes the 'matches' standard library function by compiling the regex pattern and
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// reporting any compilation errors at program creation time, and using the compiled regex pattern for all function
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// call invocations.
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var MatchesRegexOptimization = &RegexOptimization{
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Function: "matches",
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RegexIndex: 1,
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Factory: func(call InterpretableCall, regexPattern string) (InterpretableCall, error) {
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compiledRegex, err := regexp.Compile(regexPattern)
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if err != nil {
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return nil, err
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}
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return NewCall(call.ID(), call.Function(), call.OverloadID(), call.Args(), func(values ...ref.Val) ref.Val {
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if len(values) != 2 {
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return types.NoSuchOverloadErr()
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}
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in, ok := values[0].Value().(string)
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if !ok {
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return types.NoSuchOverloadErr()
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}
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return types.Bool(compiledRegex.MatchString(in))
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}), nil
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},
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}
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