'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }

var isInBrowser = _interopDefault(require('is-in-browser'));
var _toConsumableArray = _interopDefault(require('@babel/runtime/helpers/toConsumableArray'));

// Export javascript style and css style vendor prefixes.
var js = '';
var css = '';
var vendor = '';
var browser = '';
var isTouch = isInBrowser && 'ontouchstart' in document.documentElement; // We should not do anything if required serverside.

if (isInBrowser) {
  // Order matters. We need to check Webkit the last one because
  // other vendors use to add Webkit prefixes to some properties
  var jsCssMap = {
    Moz: '-moz-',
    ms: '-ms-',
    O: '-o-',
    Webkit: '-webkit-'
  };

  var _document$createEleme = document.createElement('p'),
      style = _document$createEleme.style;

  var testProp = 'Transform';

  for (var key in jsCssMap) {
    if (key + testProp in style) {
      js = key;
      css = jsCssMap[key];
      break;
    }
  } // Correctly detect the Edge browser.


  if (js === 'Webkit' && 'msHyphens' in style) {
    js = 'ms';
    css = jsCssMap.ms;
    browser = 'edge';
  } // Correctly detect the Safari browser.


  if (js === 'Webkit' && '-apple-trailing-word' in style) {
    vendor = 'apple';
  }
}
/**
 * Vendor prefix string for the current browser.
 *
 * @type {{js: String, css: String, vendor: String, browser: String}}
 * @api public
 */


var prefix = {
  js: js,
  css: css,
  vendor: vendor,
  browser: browser,
  isTouch: isTouch
};

/**
 * Test if a keyframe at-rule should be prefixed or not
 *
 * @param {String} vendor prefix string for the current browser.
 * @return {String}
 * @api public
 */

function supportedKeyframes(key) {
  // Keyframes is already prefixed. e.g. key = '@-webkit-keyframes a'
  if (key[1] === '-') return key; // No need to prefix IE/Edge. Older browsers will ignore unsupported rules.
  // https://caniuse.com/#search=keyframes

  if (prefix.js === 'ms') return key;
  return "@" + prefix.css + "keyframes" + key.substr(10);
}

// https://caniuse.com/#search=appearance

var appearence = {
  noPrefill: ['appearance'],
  supportedProperty: function supportedProperty(prop) {
    if (prop !== 'appearance') return false;
    if (prefix.js === 'ms') return "-webkit-" + prop;
    return prefix.css + prop;
  }
};

// https://caniuse.com/#search=color-adjust

var colorAdjust = {
  noPrefill: ['color-adjust'],
  supportedProperty: function supportedProperty(prop) {
    if (prop !== 'color-adjust') return false;
    if (prefix.js === 'Webkit') return prefix.css + "print-" + prop;
    return prop;
  }
};

var regExp = /[-\s]+(.)?/g;
/**
 * Replaces the letter with the capital letter
 *
 * @param {String} match
 * @param {String} c
 * @return {String}
 * @api private
 */

function toUpper(match, c) {
  return c ? c.toUpperCase() : '';
}
/**
 * Convert dash separated strings to camel-cased.
 *
 * @param {String} str
 * @return {String}
 * @api private
 */


function camelize(str) {
  return str.replace(regExp, toUpper);
}

/**
 * Convert dash separated strings to pascal cased.
 *
 * @param {String} str
 * @return {String}
 * @api private
 */

function pascalize(str) {
  return camelize("-" + str);
}

// but we can use a longhand property instead.
// https://caniuse.com/#search=mask

var mask = {
  noPrefill: ['mask'],
  supportedProperty: function supportedProperty(prop, style) {
    if (!/^mask/.test(prop)) return false;

    if (prefix.js === 'Webkit') {
      var longhand = 'mask-image';

      if (camelize(longhand) in style) {
        return prop;
      }

      if (prefix.js + pascalize(longhand) in style) {
        return prefix.css + prop;
      }
    }

    return prop;
  }
};

// https://caniuse.com/#search=text-orientation

var textOrientation = {
  noPrefill: ['text-orientation'],
  supportedProperty: function supportedProperty(prop) {
    if (prop !== 'text-orientation') return false;

    if (prefix.vendor === 'apple' && !prefix.isTouch) {
      return prefix.css + prop;
    }

    return prop;
  }
};

// https://caniuse.com/#search=transform

var transform = {
  noPrefill: ['transform'],
  supportedProperty: function supportedProperty(prop, style, options) {
    if (prop !== 'transform') return false;

    if (options.transform) {
      return prop;
    }

    return prefix.css + prop;
  }
};

// https://caniuse.com/#search=transition

var transition = {
  noPrefill: ['transition'],
  supportedProperty: function supportedProperty(prop, style, options) {
    if (prop !== 'transition') return false;

    if (options.transition) {
      return prop;
    }

    return prefix.css + prop;
  }
};

// https://caniuse.com/#search=writing-mode

var writingMode = {
  noPrefill: ['writing-mode'],
  supportedProperty: function supportedProperty(prop) {
    if (prop !== 'writing-mode') return false;

    if (prefix.js === 'Webkit' || prefix.js === 'ms' && prefix.browser !== 'edge') {
      return prefix.css + prop;
    }

    return prop;
  }
};

// https://caniuse.com/#search=user-select

var userSelect = {
  noPrefill: ['user-select'],
  supportedProperty: function supportedProperty(prop) {
    if (prop !== 'user-select') return false;

    if (prefix.js === 'Moz' || prefix.js === 'ms' || prefix.vendor === 'apple') {
      return prefix.css + prop;
    }

    return prop;
  }
};

// https://caniuse.com/#search=multicolumn
// https://github.com/postcss/autoprefixer/issues/491
// https://github.com/postcss/autoprefixer/issues/177

var breakPropsOld = {
  supportedProperty: function supportedProperty(prop, style) {
    if (!/^break-/.test(prop)) return false;

    if (prefix.js === 'Webkit') {
      var jsProp = "WebkitColumn" + pascalize(prop);
      return jsProp in style ? prefix.css + "column-" + prop : false;
    }

    if (prefix.js === 'Moz') {
      var _jsProp = "page" + pascalize(prop);

      return _jsProp in style ? "page-" + prop : false;
    }

    return false;
  }
};

// See https://github.com/postcss/autoprefixer/issues/324.

var inlineLogicalOld = {
  supportedProperty: function supportedProperty(prop, style) {
    if (!/^(border|margin|padding)-inline/.test(prop)) return false;
    if (prefix.js === 'Moz') return prop;
    var newProp = prop.replace('-inline', '');
    return prefix.js + pascalize(newProp) in style ? prefix.css + newProp : false;
  }
};

// Camelization is required because we can't test using.
// CSS syntax for e.g. in FF.

var unprefixed = {
  supportedProperty: function supportedProperty(prop, style) {
    return camelize(prop) in style ? prop : false;
  }
};

var prefixed = {
  supportedProperty: function supportedProperty(prop, style) {
    var pascalized = pascalize(prop); // Return custom CSS variable without prefixing.

    if (prop[0] === '-') return prop; // Return already prefixed value without prefixing.

    if (prop[0] === '-' && prop[1] === '-') return prop;
    if (prefix.js + pascalized in style) return prefix.css + prop; // Try webkit fallback.

    if (prefix.js !== 'Webkit' && "Webkit" + pascalized in style) return "-webkit-" + prop;
    return false;
  }
};

// https://caniuse.com/#search=scroll-snap

var scrollSnap = {
  supportedProperty: function supportedProperty(prop) {
    if (prop.substring(0, 11) !== 'scroll-snap') return false;

    if (prefix.js === 'ms') {
      return "" + prefix.css + prop;
    }

    return prop;
  }
};

// https://caniuse.com/#search=overscroll-behavior

var overscrollBehavior = {
  supportedProperty: function supportedProperty(prop) {
    if (prop !== 'overscroll-behavior') return false;

    if (prefix.js === 'ms') {
      return prefix.css + "scroll-chaining";
    }

    return prop;
  }
};

var propMap = {
  'flex-grow': 'flex-positive',
  'flex-shrink': 'flex-negative',
  'flex-basis': 'flex-preferred-size',
  'justify-content': 'flex-pack',
  order: 'flex-order',
  'align-items': 'flex-align',
  'align-content': 'flex-line-pack' // 'align-self' is handled by 'align-self' plugin.

}; // Support old flex spec from 2012.

var flex2012 = {
  supportedProperty: function supportedProperty(prop, style) {
    var newProp = propMap[prop];
    if (!newProp) return false;
    return prefix.js + pascalize(newProp) in style ? prefix.css + newProp : false;
  }
};

var propMap$1 = {
  flex: 'box-flex',
  'flex-grow': 'box-flex',
  'flex-direction': ['box-orient', 'box-direction'],
  order: 'box-ordinal-group',
  'align-items': 'box-align',
  'flex-flow': ['box-orient', 'box-direction'],
  'justify-content': 'box-pack'
};
var propKeys = Object.keys(propMap$1);

var prefixCss = function prefixCss(p) {
  return prefix.css + p;
}; // Support old flex spec from 2009.


var flex2009 = {
  supportedProperty: function supportedProperty(prop, style, _ref) {
    var multiple = _ref.multiple;

    if (propKeys.indexOf(prop) > -1) {
      var newProp = propMap$1[prop];

      if (!Array.isArray(newProp)) {
        return prefix.js + pascalize(newProp) in style ? prefix.css + newProp : false;
      }

      if (!multiple) return false;

      for (var i = 0; i < newProp.length; i++) {
        if (!(prefix.js + pascalize(newProp[0]) in style)) {
          return false;
        }
      }

      return newProp.map(prefixCss);
    }

    return false;
  }
};

// plugins = [
//   ...plugins,
//    breakPropsOld,
//    inlineLogicalOld,
//    unprefixed,
//    prefixed,
//    scrollSnap,
//    flex2012,
//    flex2009
// ]
// Plugins without 'noPrefill' value, going last.
// 'flex-*' plugins should be at the bottom.
// 'flex2009' going after 'flex2012'.
// 'prefixed' going after 'unprefixed'

var plugins = [appearence, colorAdjust, mask, textOrientation, transform, transition, writingMode, userSelect, breakPropsOld, inlineLogicalOld, unprefixed, prefixed, scrollSnap, overscrollBehavior, flex2012, flex2009];
var propertyDetectors = plugins.filter(function (p) {
  return p.supportedProperty;
}).map(function (p) {
  return p.supportedProperty;
});
var noPrefill = plugins.filter(function (p) {
  return p.noPrefill;
}).reduce(function (a, p) {
  a.push.apply(a, _toConsumableArray(p.noPrefill));
  return a;
}, []);

var el;
var cache = {};

if (isInBrowser) {
  el = document.createElement('p'); // We test every property on vendor prefix requirement.
  // Once tested, result is cached. It gives us up to 70% perf boost.
  // http://jsperf.com/element-style-object-access-vs-plain-object
  //
  // Prefill cache with known css properties to reduce amount of
  // properties we need to feature test at runtime.
  // http://davidwalsh.name/vendor-prefix

  var computed = window.getComputedStyle(document.documentElement, '');

  for (var key$1 in computed) {
    // eslint-disable-next-line no-restricted-globals
    if (!isNaN(key$1)) cache[computed[key$1]] = computed[key$1];
  } // Properties that cannot be correctly detected using the
  // cache prefill method.


  noPrefill.forEach(function (x) {
    return delete cache[x];
  });
}
/**
 * Test if a property is supported, returns supported property with vendor
 * prefix if required. Returns `false` if not supported.
 *
 * @param {String} prop dash separated
 * @param {Object} [options]
 * @return {String|Boolean}
 * @api public
 */


function supportedProperty(prop, options) {
  if (options === void 0) {
    options = {};
  }

  // For server-side rendering.
  if (!el) return prop; // Remove cache for benchmark tests or return property from the cache.

  if (process.env.NODE_ENV !== 'benchmark' && cache[prop] != null) {
    return cache[prop];
  } // Check if 'transition' or 'transform' natively supported in browser.


  if (prop === 'transition' || prop === 'transform') {
    options[prop] = prop in el.style;
  } // Find a plugin for current prefix property.


  for (var i = 0; i < propertyDetectors.length; i++) {
    cache[prop] = propertyDetectors[i](prop, el.style, options); // Break loop, if value found.

    if (cache[prop]) break;
  } // Reset styles for current property.
  // Firefox can even throw an error for invalid properties, e.g., "0".


  try {
    el.style[prop] = '';
  } catch (err) {
    return false;
  }

  return cache[prop];
}

var cache$1 = {};
var transitionProperties = {
  transition: 1,
  'transition-property': 1,
  '-webkit-transition': 1,
  '-webkit-transition-property': 1
};
var transPropsRegExp = /(^\s*[\w-]+)|, (\s*[\w-]+)(?![^()]*\))/g;
var el$1;
/**
 * Returns prefixed value transition/transform if needed.
 *
 * @param {String} match
 * @param {String} p1
 * @param {String} p2
 * @return {String}
 * @api private
 */

function prefixTransitionCallback(match, p1, p2) {
  if (p1 === 'var') return 'var';
  if (p1 === 'all') return 'all';
  if (p2 === 'all') return ', all';
  var prefixedValue = p1 ? supportedProperty(p1) : ", " + supportedProperty(p2);
  if (!prefixedValue) return p1 || p2;
  return prefixedValue;
}

if (isInBrowser) el$1 = document.createElement('p');
/**
 * Returns prefixed value if needed. Returns `false` if value is not supported.
 *
 * @param {String} property
 * @param {String} value
 * @return {String|Boolean}
 * @api public
 */

function supportedValue(property, value) {
  // For server-side rendering.
  var prefixedValue = value;
  if (!el$1 || property === 'content') return value; // It is a string or a number as a string like '1'.
  // We want only prefixable values here.
  // eslint-disable-next-line no-restricted-globals

  if (typeof prefixedValue !== 'string' || !isNaN(parseInt(prefixedValue, 10))) {
    return prefixedValue;
  } // Create cache key for current value.


  var cacheKey = property + prefixedValue; // Remove cache for benchmark tests or return value from cache.

  if (process.env.NODE_ENV !== 'benchmark' && cache$1[cacheKey] != null) {
    return cache$1[cacheKey];
  } // IE can even throw an error in some cases, for e.g. style.content = 'bar'.


  try {
    // Test value as it is.
    el$1.style[property] = prefixedValue;
  } catch (err) {
    // Return false if value not supported.
    cache$1[cacheKey] = false;
    return false;
  } // If 'transition' or 'transition-property' property.


  if (transitionProperties[property]) {
    prefixedValue = prefixedValue.replace(transPropsRegExp, prefixTransitionCallback);
  } else if (el$1.style[property] === '') {
    // Value with a vendor prefix.
    prefixedValue = prefix.css + prefixedValue; // Hardcode test to convert "flex" to "-ms-flexbox" for IE10.

    if (prefixedValue === '-ms-flex') el$1.style[property] = '-ms-flexbox'; // Test prefixed value.

    el$1.style[property] = prefixedValue; // Return false if value not supported.

    if (el$1.style[property] === '') {
      cache$1[cacheKey] = false;
      return false;
    }
  } // Reset styles for current property.


  el$1.style[property] = ''; // Write current value to cache.

  cache$1[cacheKey] = prefixedValue;
  return cache$1[cacheKey];
}

exports.prefix = prefix;
exports.supportedKeyframes = supportedKeyframes;
exports.supportedProperty = supportedProperty;
exports.supportedValue = supportedValue;