52 lines
1016 B
Go
52 lines
1016 B
Go
|
package template
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"strings"
|
||
|
|
|
||
|
|
"github.com/hashicorp/hil"
|
||
|
|
"github.com/hashicorp/hil/ast"
|
||
|
|
)
|
||
|
|
|
||
|
|
// InterpolateHIL processes the string as if it were HIL and interpolates only
|
||
|
|
// the provided string->string map as possible variables.
|
||
|
|
func InterpolateHIL(s string, vars map[string]string, lowercase bool) (string, error) {
|
||
|
|
if strings.Index(s, "${") == -1 {
|
||
|
|
// Skip going to the trouble of parsing something that has no HIL.
|
||
|
|
return s, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
tree, err := hil.Parse(s)
|
||
|
|
if err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
|
||
|
|
vm := make(map[string]ast.Variable)
|
||
|
|
for k, v := range vars {
|
||
|
|
if lowercase {
|
||
|
|
v = strings.ToLower(v)
|
||
|
|
}
|
||
|
|
vm[k] = ast.Variable{
|
||
|
|
Type: ast.TypeString,
|
||
|
|
Value: v,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
config := &hil.EvalConfig{
|
||
|
|
GlobalScope: &ast.BasicScope{
|
||
|
|
VarMap: vm,
|
||
|
|
},
|
||
|
|
}
|
||
|
|
|
||
|
|
result, err := hil.Eval(tree, config)
|
||
|
|
if err != nil {
|
||
|
|
return "", err
|
||
|
|
}
|
||
|
|
|
||
|
|
if result.Type != hil.TypeString {
|
||
|
|
return "", fmt.Errorf("generated unexpected hil type: %s", result.Type)
|
||
|
|
}
|
||
|
|
|
||
|
|
return result.Value.(string), nil
|
||
|
|
}
|