sexp-template/src/compiler.js

module.exports = class Compiler {
  constructor(tree, context) {
    this.tree = tree
    this.context = context
    this.result = ''
  }

  compile() {
    this.tree.forEach(node => {
      if (node.type === 'functionCall') {
        const attributes = node.args.map(arg => `${arg.attributeName}="${this.compileAttribute(arg.attributeValue)}"`)
        const compiler = new Compiler(node.subtree, this.context)
        const content = compiler.compile()
        this.result += `<${node.functionName}${attributes.length ? ' ' : ''}${attributes.join(' ')}>${content}</${node.functionName}>`
      } else if (node.type === 'string') {
        this.result += node.content
      } else if (node.type === 'identifier') {
        this.result += this.lookup(node.name)
      }
    })

    return this.result.trim()
  }

  compileAttribute(attribute) {
    if (attribute.type === 'string') {
      return attribute.content
    } else if (attribute.type === 'identifier') {
      return this.lookup(attribute.name)
    }
  }

  lookup(name) {
    return this.context[name]
  }
}