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Filename : is-mergeable.js
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var Marker = require('../../tokenizer/marker');
var split = require('../../utils/split');

var DEEP_SELECTOR_PATTERN = /\/deep\//;
var DOUBLE_COLON_PATTERN = /^::/;
var VENDOR_PREFIXED_PATTERN = /:(-moz-|-ms-|-o-|-webkit-)/;

var NOT_PSEUDO = ':not';
var PSEUDO_CLASSES_WITH_ARGUMENTS = [
  ':dir',
  ':lang',
  ':not',
  ':nth-child',
  ':nth-last-child',
  ':nth-last-of-type',
  ':nth-of-type'
];
var RELATION_PATTERN = /[>+~]/;
var UNMIXABLE_PSEUDO_CLASSES = [
  ':after',
  ':before',
  ':first-letter',
  ':first-line',
  ':lang'
];
var UNMIXABLE_PSEUDO_ELEMENTS = [
  '::after',
  '::before',
  '::first-letter',
  '::first-line'
];

var Level = {
  DOUBLE_QUOTE: 'double-quote',
  SINGLE_QUOTE: 'single-quote',
  ROOT: 'root'
};

function isMergeable(selector, mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging) {
  var singleSelectors = split(selector, Marker.COMMA);
  var singleSelector;
  var i, l;

  for (i = 0, l = singleSelectors.length; i < l; i++) {
    singleSelector = singleSelectors[i];

    if (singleSelector.length === 0
        || isDeepSelector(singleSelector)
        || isVendorPrefixed(singleSelector)
        || (singleSelector.indexOf(Marker.COLON) > -1
          && !areMergeable(
            singleSelector,
            extractPseudoFrom(singleSelector),
            mergeablePseudoClasses,
            mergeablePseudoElements,
            multiplePseudoMerging
          ))) {
      return false;
    }
  }

  return true;
}

function isDeepSelector(selector) {
  return DEEP_SELECTOR_PATTERN.test(selector);
}

function isVendorPrefixed(selector) {
  return VENDOR_PREFIXED_PATTERN.test(selector);
}

function extractPseudoFrom(selector) {
  var list = [];
  var character;
  var buffer = [];
  var level = Level.ROOT;
  var roundBracketLevel = 0;
  var isQuoted;
  var isEscaped;
  var isPseudo = false;
  var isRelation;
  var wasColon = false;
  var index;
  var len;

  for (index = 0, len = selector.length; index < len; index++) {
    character = selector[index];

    isRelation = !isEscaped && RELATION_PATTERN.test(character);
    isQuoted = level == Level.DOUBLE_QUOTE || level == Level.SINGLE_QUOTE;

    if (isEscaped) {
      buffer.push(character);
    } else if (character == Marker.DOUBLE_QUOTE && level == Level.ROOT) {
      buffer.push(character);
      level = Level.DOUBLE_QUOTE;
    } else if (character == Marker.DOUBLE_QUOTE && level == Level.DOUBLE_QUOTE) {
      buffer.push(character);
      level = Level.ROOT;
    } else if (character == Marker.SINGLE_QUOTE && level == Level.ROOT) {
      buffer.push(character);
      level = Level.SINGLE_QUOTE;
    } else if (character == Marker.SINGLE_QUOTE && level == Level.SINGLE_QUOTE) {
      buffer.push(character);
      level = Level.ROOT;
    } else if (isQuoted) {
      buffer.push(character);
    } else if (character == Marker.OPEN_ROUND_BRACKET) {
      buffer.push(character);
      roundBracketLevel++;
    } else if (character == Marker.CLOSE_ROUND_BRACKET && roundBracketLevel == 1 && isPseudo) {
      buffer.push(character);
      list.push(buffer.join(''));
      roundBracketLevel--;
      buffer = [];
      isPseudo = false;
    } else if (character == Marker.CLOSE_ROUND_BRACKET) {
      buffer.push(character);
      roundBracketLevel--;
    } else if (character == Marker.COLON && roundBracketLevel === 0 && isPseudo && !wasColon) {
      list.push(buffer.join(''));
      buffer = [];
      buffer.push(character);
    } else if (character == Marker.COLON && roundBracketLevel === 0 && !wasColon) {
      buffer = [];
      buffer.push(character);
      isPseudo = true;
    } else if (character == Marker.SPACE && roundBracketLevel === 0 && isPseudo) {
      list.push(buffer.join(''));
      buffer = [];
      isPseudo = false;
    } else if (isRelation && roundBracketLevel === 0 && isPseudo) {
      list.push(buffer.join(''));
      buffer = [];
      isPseudo = false;
    } else {
      buffer.push(character);
    }

    isEscaped = character == Marker.BACK_SLASH;
    wasColon = character == Marker.COLON;
  }

  if (buffer.length > 0 && isPseudo) {
    list.push(buffer.join(''));
  }

  return list;
}

function areMergeable(selector, matches, mergeablePseudoClasses, mergeablePseudoElements, multiplePseudoMerging) {
  return areAllowed(matches, mergeablePseudoClasses, mergeablePseudoElements)
    && needArguments(matches)
    && (matches.length < 2 || !someIncorrectlyChained(selector, matches))
    && (matches.length < 2 || multiplePseudoMerging && allMixable(matches));
}

function areAllowed(matches, mergeablePseudoClasses, mergeablePseudoElements) {
  var match;
  var name;
  var i, l;

  for (i = 0, l = matches.length; i < l; i++) {
    match = matches[i];
    name = match.indexOf(Marker.OPEN_ROUND_BRACKET) > -1
      ? match.substring(0, match.indexOf(Marker.OPEN_ROUND_BRACKET))
      : match;

    if (mergeablePseudoClasses.indexOf(name) === -1 && mergeablePseudoElements.indexOf(name) === -1) {
      return false;
    }
  }

  return true;
}

function needArguments(matches) {
  var match;
  var name;
  var bracketOpensAt;
  var hasArguments;
  var i, l;

  for (i = 0, l = matches.length; i < l; i++) {
    match = matches[i];

    bracketOpensAt = match.indexOf(Marker.OPEN_ROUND_BRACKET);
    hasArguments = bracketOpensAt > -1;
    name = hasArguments
      ? match.substring(0, bracketOpensAt)
      : match;

    if (hasArguments && PSEUDO_CLASSES_WITH_ARGUMENTS.indexOf(name) == -1) {
      return false;
    }

    if (!hasArguments && PSEUDO_CLASSES_WITH_ARGUMENTS.indexOf(name) > -1) {
      return false;
    }
  }

  return true;
}

function someIncorrectlyChained(selector, matches) {
  var positionInSelector = 0;
  var match;
  var matchAt;
  var nextMatch;
  var nextMatchAt;
  var name;
  var nextName;
  var areChained;
  var i, l;

  for (i = 0, l = matches.length; i < l; i++) {
    match = matches[i];
    nextMatch = matches[i + 1];

    if (!nextMatch) {
      break;
    }

    matchAt = selector.indexOf(match, positionInSelector);
    nextMatchAt = selector.indexOf(match, matchAt + 1);
    positionInSelector = nextMatchAt;
    areChained = matchAt + match.length == nextMatchAt;

    if (areChained) {
      name = match.indexOf(Marker.OPEN_ROUND_BRACKET) > -1
        ? match.substring(0, match.indexOf(Marker.OPEN_ROUND_BRACKET))
        : match;
      nextName = nextMatch.indexOf(Marker.OPEN_ROUND_BRACKET) > -1
        ? nextMatch.substring(0, nextMatch.indexOf(Marker.OPEN_ROUND_BRACKET))
        : nextMatch;

      if (name != NOT_PSEUDO || nextName != NOT_PSEUDO) {
        return true;
      }
    }
  }

  return false;
}

function allMixable(matches) {
  var unmixableMatches = 0;
  var match;
  var i, l;

  for (i = 0, l = matches.length; i < l; i++) {
    match = matches[i];

    if (isPseudoElement(match)) {
      unmixableMatches += UNMIXABLE_PSEUDO_ELEMENTS.indexOf(match) > -1 ? 1 : 0;
    } else {
      unmixableMatches += UNMIXABLE_PSEUDO_CLASSES.indexOf(match) > -1 ? 1 : 0;
    }

    if (unmixableMatches > 1) {
      return false;
    }
  }

  return true;
}

function isPseudoElement(pseudo) {
  return DOUBLE_COLON_PATTERN.test(pseudo);
}

module.exports = isMergeable;