Hcl::Checker

Hashicorp Configuration Language syntax checker and parser.

Parser originally created by Sikula and available at Ruby HCL Repository. Only works with HCL Version 1.

Installation

Add this line to your application's Gemfile:

gem 'hcl-checker'

And then execute:

$ bundle

Or install it yourself as:

$ gem install hcl-checker

Usage

Load HCL string:

hcl_string = 'provider "aws" {
    region = "${var.aws_region}"
    access_key = "${var.aws_access_key}"
    secret_key = "${var.aws_secret_key}"
}

# This is a awesome comment
resource "aws_vpc" "default" {
  cidr_block = "10.0.0.0/16"
  enable_dns_hostnames = true
  tags {
    Name = "Event Store VPC"
  }
}'

You can validate the hcl_string contents with valid? method. This will return true if is a valid HCL or false if not.

2.3.2 :014 > HCL::Checker.valid? hcl_string
 => true

You can parse the hcl_string into a Hash with parse method.

2.3.2 :015 > HCL::Checker.parse(hcl_string)
 => {"provider"=>{"aws"=>{"region"=>"${var.aws_region}", "access_key"=>"${var.aws_access_key}", "secret_key"=>"${var.aws_secret_key}"}}, "resource"=>{"aws_vpc"=>{"default"=>{"cidr_block"=>"10.0.0.0/16", "enable_dns_hostnames"=>true, "tags"=>{"Name"=>"Event Store VPC"}}}}}

If after a parse you got false you can check last_error with:

2.4.2 :063 > HCL::Checker.last_error
 => "Parse error at  \"eec8b16c-ee89-4ea0-bdcc-d094300a42e8\" , (invalid token: ,)"

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Building grammar

$ bundle exec rake build_grammar
Building Lexer....done
Building Parser....done

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/mfcastellani/hcl-checker. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.

thiagoarrais / hcl-checker