rofrischmann/inline-style-prefixer

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = flexboxIE;
var alternativeValues = {
  'space-around': 'distribute',
  'space-between': 'justify',
  'flex-start': 'start',
  'flex-end': 'end'
};
var alternativeProps = {
  alignContent: 'msFlexLinePack',
  alignSelf: 'msFlexItemAlign',
  alignItems: 'msFlexAlign',
  justifyContent: 'msFlexPack',
  order: 'msFlexOrder',
  flexGrow: 'msFlexPositive',
  flexShrink: 'msFlexNegative',
  flexBasis: 'msFlexPreferredSize'
  // Full expanded syntax is flex-grow | flex-shrink | flex-basis.
};var flexShorthandMappings = {
  auto: '1 1 auto',
  inherit: 'inherit',
  initial: '0 1 auto',
  none: '0 0 auto',
  unset: 'unset'
};
var isUnitlessNumber = /^\d+(\.\d+)?$/;
var logTag = 'inline-style-prefixer.flexboxIE plugin';
function flexboxIE(property, value, style) {
  if (Object.prototype.hasOwnProperty.call(alternativeProps, property)) {
    style[alternativeProps[property]] = alternativeValues[value] || value;
  }
  if (property === 'flex') {
    // For certain values we can do straight mappings based on the spec
    // for the expansions.
    if (Object.prototype.hasOwnProperty.call(flexShorthandMappings, value)) {
      style.msFlex = flexShorthandMappings[value];
      return;
    }
    // Here we have no direct mapping, so we favor looking for a
    // unitless positive number as that will be the most common use-case.
    if (isUnitlessNumber.test(value)) {
      style.msFlex = value + ' 1 0%';
      return;
    }

    if (typeof value === 'number' && value < 0) {
      // ignore negative values;
      console.warn(logTag + ': "flex: ' + value + '", negative values is not valid and will be ignored.');
      return;
    }

    if (!value.split) {
      console.warn(logTag + ': "flex: ' + value + '", value format is not detected, it will be remain as is');
      style.msFlex = value;
      return;
    }

    // The next thing we can look for is if there are multiple values.
    var flexValues = value.split(/\s/);
    // If we only have a single value that wasn't a positive unitless
    // or a pre-mapped value, then we can assume it is a unit value.
    switch (flexValues.length) {
      case 1:
        style.msFlex = '1 1 ' + value;
        return;
      case 2:
        // If we have 2 units, then we expect that the first will
        // always be a unitless number and represents flex-grow.
        // The second unit will represent flex-shrink for a unitless
        // value, or flex-basis otherwise.
        if (isUnitlessNumber.test(flexValues[1])) {
          style.msFlex = flexValues[0] + ' ' + flexValues[1] + ' 0%';
        } else {
          style.msFlex = flexValues[0] + ' 1 ' + flexValues[1];
        }
        return;
      default:
        style.msFlex = value;
    }
  }
}