52 lines
1,016 B
Go
52 lines
1,016 B
Go
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package template
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import (
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"fmt"
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"strings"
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"github.com/hashicorp/hil"
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"github.com/hashicorp/hil/ast"
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)
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// InterpolateHIL processes the string as if it were HIL and interpolates only
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// the provided string->string map as possible variables.
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func InterpolateHIL(s string, vars map[string]string, lowercase bool) (string, error) {
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if strings.Index(s, "${") == -1 {
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// Skip going to the trouble of parsing something that has no HIL.
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return s, nil
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}
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tree, err := hil.Parse(s)
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if err != nil {
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return "", err
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}
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vm := make(map[string]ast.Variable)
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for k, v := range vars {
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if lowercase {
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v = strings.ToLower(v)
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}
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vm[k] = ast.Variable{
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Type: ast.TypeString,
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Value: v,
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}
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}
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config := &hil.EvalConfig{
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GlobalScope: &ast.BasicScope{
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VarMap: vm,
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},
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}
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result, err := hil.Eval(tree, config)
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if err != nil {
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return "", err
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}
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if result.Type != hil.TypeString {
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return "", fmt.Errorf("generated unexpected hil type: %s", result.Type)
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}
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return result.Value.(string), nil
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}
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