weex-templater/lib/parsers/text.js

Weex <template> transformer

var tagSource = '{{{(.+?)}}}|{{(.+?)}}'
var tagRE = new RegExp(tagSource, 'g')
var expRE = new RegExp(tagSource)
var htmlRE = new RegExp('^{{{.*}}}$')

/**
 * Parse a template text string into an array of tokens.
 *
 * @param {String} text
 * @return {Array<Object> | null}
 *               - {String} type
 *               - {String} value
 *               - {Boolean} [html]
 *               - {Boolean} [oneTime]
 */
function parseText(text) {
  text = text.replace(/\n/g, '')
  /* istanbul ignore if */
  if (!tagRE.test(text)) {
    return null
  }
  var tokens = []
  var lastIndex = tagRE.lastIndex = 0
  var match, index, html, value, first, oneTime
  /* eslint-disable no-cond-assign */
  while (match = tagRE.exec(text)) {
  /* eslint-enable no-cond-assign */
    index = match.index
    // push text token
    if (index > lastIndex) {
      tokens.push({
        value: text.slice(lastIndex, index)
      })
    }
    // tag token
    html = htmlRE.test(match[0])
    value = html ? match[1] : match[2]
    first = value.charCodeAt(0)
    oneTime = first === 42 // *
    value = oneTime
      ? value.slice(1)
      : value
    tokens.push({
      tag: true,
      value: value.trim(),
      html: html,
      oneTime: oneTime
    })
    lastIndex = index + match[0].length
  }
  if (lastIndex < text.length) {
    tokens.push({
      value: text.slice(lastIndex)
    })
  }
  return tokens
}

/**
 * judge expression
 * @param  {String} text
 * @return {Boolean}
 */
function isExpr(text) {
  return expRE.test(text)
}

exports.parseText = parseText
exports.isExpr = isExpr