Segmentation violation when file contains a block and an object

[dmitry-g]

Hello, I encounter a segmentation fault when input file contains both block and object. Here is a simple example to reproduce the issue:

include {
  path = find_in_parent_folders()
}

inputs = {
  id = "123"
}

package main

import (
	"go.mercari.io/hcledit"
)

func main() {
	editor, _ := hcledit.ReadFile("config.hcl")

	key := "inputs.id"

	editor.Read(key)
}

Error message:

[signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x1021ee128]

goroutine 1 [running]:
go.mercari.io/hcledit/internal/ast.ReplaceBodyTokens(0x140000b89d8, {0x140000a2400, 0x6}, {0x140000fa320, 0xc, 0x1?})
	/Users/user/.asdf/installs/golang/1.21.0/packages/pkg/mod/go.mercari.io/hcledit@v0.0.9/internal/ast/ast.go:31 +0x1e8
go.mercari.io/hcledit/internal/walker.(*Walker).walkAttribute(0x14000163ec8, 0x140000b89d8, {0x140000d02e0, 0x2, 0x2}, 0x0, {0x102414400, 0x0, 0x0})
	/Users/user/.asdf/installs/golang/1.21.0/packages/pkg/mod/go.mercari.io/hcledit@v0.0.9/internal/walker/walker.go:81 +0x984
go.mercari.io/hcledit/internal/walker.(*Walker).Walk(0x1021f4210?, 0x49?, {0x140000d02e0, 0x2, 0x2}, 0x2a?, {0x102414400, 0x0, 0x0})
	/Users/user/.asdf/installs/golang/1.21.0/packages/pkg/mod/go.mercari.io/hcledit@v0.0.9/internal/walker/walker.go:26 +0x40
go.mercari.io/hcledit.(*HCLEditor).Read(0x14000134c60, {0x1021f4210, 0x9}, {0x0, 0x0, 0x140000021a0?})
	/Users/user/.asdf/installs/golang/1.21.0/packages/pkg/mod/go.mercari.io/hcledit@v0.0.9/hcledit.go:102 +0x16c
main.main()
	/Users/user/sites/golang/hclp/main_backup.go:12 +0x44
exit status 2

What I also noticed:

• if I remove the block and leave only object (or vice versa), it works fine
• the program does not panic if the attribute is not existing in the input object (for example, searching input.whatever in this case). It does not find the key, but does not crash.

Thank you!