staples/index.js

exports.printVersion = () => {
  const pjson = require('./package.json')
  console.log(`Staples ${pjson.version}`)
}

exports.compile = (template, input) => {
  let index = 0

  const getValue = (tagContent) => {
  console.log('input', tagContent)
    let tagContentSplit = tagContent.split('.')
    let varLevel = null
    tagContentSplit.forEach( (level) => {
      const isIndex = Number.isInteger(parseInt(level))
      if(!varLevel) varLevel = input
      varLevel = isIndex ? varLevel[parseInt(level)] : varLevel[level]
    })
    return typeof varLevel === 'string' ? varLevel.trim() : varLevel
  }

  while(index < template.length) {
    const nextOpen = template.indexOf('{{', index+1)

    if(nextOpen == index || nextOpen == -1) {
      index = template.length
    } else {
      index = nextOpen
      const nextClose = template.indexOf('}}', index+1)
      if(nextClose == index || nextClose == -1) {
        index = template.length
      } else {
        index = nextOpen+2
        let tagContent = template.substring(nextOpen+2, nextClose)

        if(tagContent.substring(0,1) == '#') {
          const isIf = tagContent.substring(0,3) == '#if'
          const isUnless = tagContent.substring(0,7) == '#unless'

          console.log('tagContent.substring(0,3)',tagContent.substring(0,3),index)
          if(isIf) {
            const conditionStart = template.indexOf('}}', index+1)
            const conditionStop = template.indexOf('{{/if}}', conditionStart+1)
            const conditionContent = template.substring(conditionStart+2, conditionStop)
            const conditionFull = template.substring(index-2, conditionStop+7)
            const value = getValue(tagContent.substring(4)) ? conditionContent : ''
            template = template.replace(conditionFull, value)
            console.log('conditionFull',conditionFull, `-${value}-`, `-${tagContent.substring(4)}-`, conditionContent)
            index += value.length
          } else if(isUnless) {
            const conditionStart = template.indexOf('}}', index+1)
            const conditionStop = template.indexOf('{{/unless}}', conditionStart+1)
            const conditionContent = template.substring(conditionStart+2, conditionStop)
            const conditionFull = template.substring(index-2, conditionStop+11)
            const value = !getValue(tagContent.substring(8)) ? conditionContent : ''
            template = template.replace(conditionFull, value)
            index += value.length
          }
          console.log('index', index)
        } else {
          const value = getValue(tagContent)
          template = template.replace(`{{${tagContent}}}`, value)
          //index += value.length+1
        }
      }
    }
  }
  return template
}