30 lines
740 B
Go
30 lines
740 B
Go
package hil
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import (
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"github.com/hashicorp/hil/ast"
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)
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// FixedValueTransform transforms an AST to return a fixed value for
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// all interpolations. i.e. you can make "hi ${anything}" always
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// turn into "hi foo".
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//
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// The primary use case for this is for config validations where you can
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// verify that interpolations result in a certain type of string.
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func FixedValueTransform(root ast.Node, Value *ast.LiteralNode) ast.Node {
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// We visit the nodes in top-down order
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result := root
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switch n := result.(type) {
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case *ast.Output:
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for i, v := range n.Exprs {
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n.Exprs[i] = FixedValueTransform(v, Value)
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}
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case *ast.LiteralNode:
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// We keep it as-is
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default:
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// Anything else we replace
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result = Value
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}
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return result
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}
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