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template-item.js

'use strict'
var stringWidth = require('string-width')

module.exports = TemplateItem

function isPercent (num) {
  if (typeof num !== 'string') return false
  return num.slice(-1) === '%'
}

function percent (num) {
  return Number(num.slice(0, -1)) / 100
}

function TemplateItem (values, outputLength) {
  this.overallOutputLength = outputLength
  this.finished = false
  this.type = null
  this.value = null
  this.length = null
  this.maxLength = null
  this.minLength = null
  this.kerning = null
  this.align = 'left'
  this.padLeft = 0
  this.padRight = 0
  this.index = null
  this.first = null
  this.last = null
  if (typeof values === 'string') {
    this.value = values
  } else {
    for (var prop in values) this[prop] = values[prop]
  }
  // Realize percents
  if (isPercent(this.length)) {
    this.length = Math.round(this.overallOutputLength * percent(this.length))
  }
  if (isPercent(this.minLength)) {
    this.minLength = Math.round(this.overallOutputLength * percent(this.minLength))
  }
  if (isPercent(this.maxLength)) {
    this.maxLength = Math.round(this.overallOutputLength * percent(this.maxLength))
  }
  return this
}

TemplateItem.prototype = {}

TemplateItem.prototype.getBaseLength = function () {
  var length = this.length
  if (length == null && typeof this.value === 'string' && this.maxLength == null && this.minLength == null) {
    length = stringWidth(this.value)
  }
  return length
}

TemplateItem.prototype.getLength = function () {
  var length = this.getBaseLength()
  if (length == null) return null
  return length + this.padLeft + this.padRight
}

TemplateItem.prototype.getMaxLength = function () {
  if (this.maxLength == null) return null
  return this.maxLength + this.padLeft + this.padRight
}

TemplateItem.prototype.getMinLength = function () {
  if (this.minLength == null) return null
  return this.minLength + this.padLeft + this.padRight
}

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