main.go

package main

import (
	"fmt"
	"os"
	"path/filepath"

	"github.com/hashicorp/hcl/v2"
	"github.com/hashicorp/hcl/v2/hclsyntax"
)

func main() {
	err := checkFile("main.tf")
	if err != nil {
		fmt.Println(err)
	}
	err = checkFile("main2.tf")
	if err != nil {
		fmt.Println(err)
	}
}

func checkFile(filename string) error {
	fmt.Printf("Checking file: %s\n", filename)
	pos := hcl.InitialPos

	fullPath, err := filepath.Abs(filename)
	if err != nil {
		return err
	}
	src, err := os.ReadFile(fullPath)
	if err != nil {
		return err
	}
	f, _ := hclsyntax.ParseConfig(src, filename, pos)

	body, isHcl := f.Body.(*hclsyntax.Body)
	if !isHcl {
		return fmt.Errorf("ERR: no hcl content in file: %s", filename)
	}

	fmt.Println(body.Range())
	if !body.Range().ContainsPos(pos) {
		return fmt.Errorf("ERR: %s: position %s is out of range %s", filename, stringPos(pos), body.Range())
	}

	return nil
}

func stringPos(pos hcl.Pos) string {
	return fmt.Sprintf("%d,%d", pos.Line, pos.Column)
}

main.tf

/********************************
 Some comment
********************************/

data "google_project" "project" {
  project_id = var.project_id
}

/********************************
 More content
********************************/

main2.tf

# some
# content

data "google_project" "project" {
  project_id = var.project_id
}

# more
# content

result.md

$ go run main.go
Checking file: main.tf
main.tf:3,34-11,34
ERR: main.tf: position 1,1 is out of range main.tf:3,34-11,34
Checking file: main2.tf
main2.tf:1,1-9,10

When the file starts with a multiline comment, the SrcRange of the hclsyntax.Body starts at line 3 instead of line 1.