all files / liquidjs/tags/ cycle.js

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const Liquid = require('..')
const lexical = Liquid.lexical
const groupRE = new RegExp(`^(?:(${lexical.value.source})\\s*:\\s*)?(.*)$`)
const candidatesRE = new RegExp(lexical.value.source, 'g')
const assert = require('../src/util/assert.js')
 
module.exports = function (liquid) {
  liquid.registerTag('cycle', {
 
    parse: function (tagToken, remainTokens) {
      var match = groupRE.exec(tagToken.args)
      assert(match, `illegal tag: ${tagToken.raw}`)
 
      this.group = match[1] || ''
      var candidates = match[2]
 
      this.candidates = []
 
      while ((match = candidatesRE.exec(candidates))) {
        this.candidates.push(match[0])
      }
      assert(this.candidates.length, `empty candidates: ${tagToken.raw}`)
    },
 
    render: function (scope, hash) {
      var group = Liquid.evalValue(this.group, scope)
      var fingerprint = `cycle:${group}:` + this.candidates.join(',')
 
      var groups = scope.opts.groups = scope.opts.groups || {}
      var idx = groups[fingerprint]
 
      if (idx === undefined) {
        idx = groups[fingerprint] = 0
      }
 
      var candidate = this.candidates[idx]
      idx = (idx + 1) % this.candidates.length
      groups[fingerprint] = idx
 
      return Promise.resolve(Liquid.evalValue(candidate, scope))
    }
  })
}