sexp-template/src/compiler.js

const AST = require('./ast')

module.exports = class Compiler {
  compile(tree) {
    let output = ''

    tree.forEach(node => {
      output += this.compileNode(node)
    })

    return output
  }

  compileNode(node) {
    switch (node.constructor) {
      case AST.Number:
      case AST.String:
        return node.value
      case AST.Lambda:
        return '<lambda>'
      case AST.HTMLElement:
        let el = `<${node.name}`

        if (node.attributes.length > 0) {
          el += ' '
          el += node.attributes.map(attr => `${attr.name}="${this.compileNode(attr.value)}"`).join(' ')
        }

        el += '>'

        if (node.contents.length > 0) {
          el += node.contents.map(content => this.compileNode(content)).join('')
        }

        if (node.selfClosing === false) {
          el += `</${node.name}>`
        }

        return el
    }
  }
}