112 lines
2.2 KiB
Go
112 lines
2.2 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package helpers
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import (
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"encoding/json"
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"unicode"
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"unicode/utf8"
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"github.com/hashicorp/hcl"
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)
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// hclDecode is a modified version of hcl.Decode just for the super general
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// purposes here. There's some strange bug in how hcl.Decode decodes json where
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//
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// { "sub" : { "v1" : { "field" : "value1" }, "v2" : { "field" : "value2" } } }
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//
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// hcl.Decode-s into:
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//
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// map[string]interface {}{
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// "sub":[]map[string]interface {}{
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// map[string]interface {}{
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// "v1":[]map[string]interface {}{
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// map[string]interface {}{
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// "field":"value1"
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// }
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// }
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// },
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// map[string]interface {}{
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// "v2":[]map[string]interface {}{
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// map[string]interface {}{
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// "field":"value2"
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// }
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// }
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// }
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// }
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// }
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//
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// but json.Unmarshal-s into the more expected:
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//
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// map[string]interface {}{
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// "sub":map[string]interface {}{
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// "v1":map[string]interface {}{
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// "field":"value1"
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// },
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// "v2":map[string]interface {}{
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// "field":"value2"
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// }
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// }
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// }
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//
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// The strange part is that the following HCL:
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//
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// sub { "v1" = { field = "value1" }, "v2" = { field = "value2" } }
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//
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// hcl.Decode-s into:
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//
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// map[string]interface {}{
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// "sub":[]map[string]interface {}{
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// map[string]interface {}{
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// "v1":[]map[string]interface {}{
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// map[string]interface {}{
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// "field":"value1"
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// }
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// },
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// "v2":[]map[string]interface {}{
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// map[string]interface {}{
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// "field":"value2"
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// }
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// }
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// }
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// }
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// }
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//
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// Which is the "correct" value assuming you did the patch-slice-of-maps correction.
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//
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// Given that HCLv1 is basically frozen and the HCL part of it is fine instead
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// of trying to track down a weird bug we'll bypass the weird JSON decoder and just use
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// the stdlib one.
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func hclDecode(out interface{}, in string) error {
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data := []byte(in)
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if isHCL(data) {
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return hcl.Decode(out, in)
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}
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return json.Unmarshal(data, out)
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}
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// this is an inlined variant of hcl.lexMode()
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func isHCL(v []byte) bool {
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var (
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r rune
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w int
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offset int
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)
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for {
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r, w = utf8.DecodeRune(v[offset:])
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offset += w
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if unicode.IsSpace(r) {
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continue
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}
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if r == '{' {
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return false
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}
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break
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}
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return true
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}
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