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evalstate.go
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evalstate.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package cuefrontend
import (
"context"
"cuelang.org/go/cue"
"namespacelabs.dev/foundation/internal/frontend/fncue"
)
type EvalFuncs struct {
fetchers map[string]FetcherFunc
}
type Fetcher interface {
Fetch(context.Context, cue.Value, fncue.KeyAndPath) (interface{}, error)
}
var (
consumeNoValue = "consume no value"
ConsumeNoValue = &consumeNoValue
)
type FetcherFunc func(context.Context, cue.Value) (interface{}, error)
func newFuncs() *EvalFuncs {
return &EvalFuncs{
fetchers: map[string]FetcherFunc{},
}
}
func (s *EvalFuncs) copy() *EvalFuncs {
n := &EvalFuncs{
fetchers: map[string]FetcherFunc{},
}
for k, v := range s.fetchers {
n.fetchers[k] = v
}
return n
}
func (s *EvalFuncs) WithFetcher(key string, f FetcherFunc) *EvalFuncs {
n := s.copy()
n.fetchers[key] = f
return n
}
func (s *EvalFuncs) Fetch(ctx context.Context, v cue.Value, kp fncue.KeyAndPath) (interface{}, error) {
f := s.fetchers[kp.Key]
if f != nil {
return f(ctx, v)
}
return nil, nil
}