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escodegen (https://github.com/Constellation/escodegen) is an ECMAScript code generator that converts an abstract syntax tree (such as one created by Esprima) into ECMAScript. This library wraps the escodegen JavaScript library for easy use within Ruby.

Install the gem as you would any other:

gem install escodegen

Then, require it in your project:

require 'escodegen'

Let's say you have an AST for the expression 7 + 8;:

ast = {
  :type => "Program",
  :body => [{
    :type => "ExpressionStatement",
    :expression => {
      :left => {
        :type => "Literal",
        :value => 7
      },
      :type => "BinaryExpression",
      :right => {
        :type => "Literal",
        :value => 8
      },
      :operator => "+"
    }
  }]
}

Here's how to use escodegen to generate the JavaScript from the AST:

generator = Escodegen::Generator.new
generator.generate(ast)

This should output 7 + 8;.

No external requirements.

Run bundle exec rake or bundle exec rspec.

• Cameron C. Dutro: https://github.com/camertron
• The escodegen team including Yusuke Suzuki: https://github.com/Constellation

• escodegen https://github.com/Constellation/escodegen

Licensed under the Apache License, Version 2.0: http://www.apache.org/licenses/LICENSE-2.0