sexp-template/src/evaluator.js

const AST = require('./ast')
const Env = require('./env')

module.exports = class Evaluator {
  eval(tree, env) {
    let evaluatedTree = []

    tree.forEach(node => {
      evaluatedTree.push(this.evalNode(node, env))
    })

    return evaluatedTree
  }

  evalNode(node, env) {
    switch (node.constructor) {
      case AST.Application:
        switch (node.function.constructor) {
          case AST.Identifier:
            node.function = env.get(node.function.name)
            break
        }
    }

    return node
  }
}