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// Copyright 2019 The Kubernetes Authors.
// SPDX-License-Identifier: Apache-2.0
package accumulator
import (
"sigs.k8s.io/kustomize/api/filters/refvar"
"sigs.k8s.io/kustomize/api/resmap"
"sigs.k8s.io/kustomize/api/types"
)
type refVarTransformer struct {
varMap map[string]interface{}
replacementCounts map[string]int
fieldSpecs []types.FieldSpec
}
// newRefVarTransformer returns a new refVarTransformer
// that replaces $(VAR) style variables with values.
// The fieldSpecs are the places to look for occurrences of $(VAR).
func newRefVarTransformer(
varMap map[string]interface{}, fs []types.FieldSpec) *refVarTransformer {
return &refVarTransformer{
varMap: varMap,
fieldSpecs: fs,
}
}
// UnusedVars returns slice of Var names that were unused
// after a Transform run.
func (rv *refVarTransformer) UnusedVars() []string {
var unused []string
for k := range rv.varMap {
if _, ok := rv.replacementCounts[k]; !ok {
unused = append(unused, k)
}
}
return unused
}
// Transform replaces $(VAR) style variables with values.
func (rv *refVarTransformer) Transform(m resmap.ResMap) error {
rv.replacementCounts = make(map[string]int)
mf := refvar.MakePrimitiveReplacer(rv.replacementCounts, rv.varMap)
for _, res := range m.Resources() {
for _, fieldSpec := range rv.fieldSpecs {
err := res.ApplyFilter(refvar.Filter{
MappingFunc: mf,
FieldSpec: fieldSpec,
})
if err != nil {
return err
}
}
}
return nil
}
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