Unknown token: IDENT , when decoding/parsing terraform file - amazon-web-services

Question

I am parsing main.tf file , so that I can use the arguments passed into the module in my go lang program.
Terraform 0.13 ( main.tf )
terraform {
backend "s3" {
bucket = "bucket"
key = "c2an8q6a0brja8jaq3k0.tfstate"
region = "us-west-2"
dynamodb_table = "terraform-lock"
skip_region_validation = true
}
}
provider "null" {
version = "2.1"
}
provider "random" {
version = "2.3"
}
provider "template" {
version = "2.1"
}
provider "archive" {
version = "1.3"
}
provider "aws" {
version = "<= 4.0"
region = "us-west-2"
}
output "aws_vpc_main" {
value = module.dev-c2an8q6a0brja8jaq3k0-Network.vpc_id
}
module "dev-c2an8q6a0brja8jaq3k0-Network" {
source = "gitsource"
cidr = "10.0.0.0/16"
cluster_id = "c2an8q6a0brja8jaq3k0"
env = "dev"
owner = "me"
region = "us-west-2"
super_cluster = "dev"
platform_api = "api"
proj = "this"
}
From the above main.tf file, I would like to parse various arguments ( i.e env, owner, region,cidr etc etc ) that is passed on to the modules.
I am using below go program to try to do some parsing going.
main.go
package main
import (
"fmt"
"io/ioutil"
"github.com/hashicorp/hcl"
)
func main() {
FileContent, err := ioutil.ReadFile("main.tf") // just pass the file name
if err != nil {
fmt.Print(err)
}
var out interface{}
FileContentString := string(FileContent) // convert content to a 'string'
err = hcl.Decode(&out, FileContentString)
if err != nil {
fmt.Println(err)
}
fmt.Println(out)
}
However above program is erroring out with the following error message - At 33:11: Unknown token: 33:11 IDENT module.dev-c2an8q6a0brja8jaq3k0-Network.vpc_id
If I change the interpolation syntax on the above main.tf file to match with terraform 0.11 and earlier, the program main.go just works fine.
Terraform 0.11 ( main.tf )
terraform {
backend "s3" {
bucket = "bucket"
key = "c2an8q6a0brja8jaq3k0.tfstate"
region = "us-west-2"
dynamodb_table = "terraform-lock"
skip_region_validation = true
}
}
provider "null" {
version = "2.1"
}
provider "random" {
version = "2.3"
}
provider "template" {
version = "2.1"
}
provider "archive" {
version = "1.3"
}
provider "aws" {
version = "<= 4.0"
region = "us-west-2"
}
output "aws_vpc_main" {
value = "${module.dev-c2an8q6a0brja8jaq3k0-Network.vpc_id}"
}
module "dev-c2an8q6a0brja8jaq3k0-Network" {
source = "gitsource"
cidr = "10.0.0.0/16"
cluster_id = "c2an8q6a0brja8jaq3k0"
env = "dev"
owner = "me"
region = "us-west-2"
super_cluster = "dev"
platform_api = "api"
proj = "virt"
}
main.go program output
map[module:[map[dev-c2an8q6a0brja8jaq3k0-Network:[map[cidr:10.0.0.0/16 cluster_id:c2an8q6a0brja8jaq3k0 env:dev owner:me platform_api:api proj:virt region:us-west-2 source:gitsource super_cluster:dev]]]] output:[map[aws_vpc_main:[map[value:${module.dev-c2an8q6a0brja8jaq3k0-Network.vpc_id}]]]] provider:[map[null:[map[version:2.1]]] map[random:[map[version:2.3]]] map[template:[map[version:2.1]]] map[archive:[map[version:1.3]]] map[aws:[map[region:us-west-2 version:<= 4.0]]]] terraform:[map[backend:[map[s3:[map[bucket:bucket dynamodb_table:terraform-lock key:c2an8q6a0brja8jaq3k0.tfstate region:us-west-2 skip_region_validation:true]]]]]]]
Which, I can parse later on with various methods.
I am just out of ideas as to why its not working with the latest terraform version configuration.
Thank you.
EDIT
I just want to update this question with the research I have done so far.
There is a package called terraform-config-inspect however it doesn't support parsing the module arguments at the moment.
I have also looked at the hclv2 ( as thats what Terraform uses ) from 0.13 and going forward, however I am not able to find any sort of function or method to parse the terraform files,just like it used to support in hclv1.
Thanks