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76 lines
2.1 KiB
Go
76 lines
2.1 KiB
Go
// Copyright 2018 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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"github.com/google/cel-go/common/types/ref"
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)
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// EvalState tracks the values associated with expression ids during execution.
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type EvalState interface {
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// IDs returns the list of ids with recorded values.
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IDs() []int64
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// Value returns the observed value of the given expression id if found, and a nil false
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// result if not.
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Value(int64) (ref.Val, bool)
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// SetValue sets the observed value of the expression id.
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SetValue(int64, ref.Val)
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// Reset clears the previously recorded expression values.
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Reset()
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}
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// evalState permits the mutation of evaluation state for a given expression id.
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type evalState struct {
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values map[int64]ref.Val
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}
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// NewEvalState returns an EvalState instanced used to observe the intermediate
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// evaluations of an expression.
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func NewEvalState() EvalState {
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return &evalState{
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values: make(map[int64]ref.Val),
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}
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}
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// IDs implements the EvalState interface method.
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func (s *evalState) IDs() []int64 {
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var ids []int64
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for k, v := range s.values {
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if v != nil {
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ids = append(ids, k)
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}
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}
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return ids
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}
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// Value is an implementation of the EvalState interface method.
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func (s *evalState) Value(exprID int64) (ref.Val, bool) {
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val, found := s.values[exprID]
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return val, found
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}
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// SetValue is an implementation of the EvalState interface method.
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func (s *evalState) SetValue(exprID int64, val ref.Val) {
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s.values[exprID] = val
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}
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// Reset implements the EvalState interface method.
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func (s *evalState) Reset() {
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s.values = map[int64]ref.Val{}
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}
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