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var canReorder = require('./reorderable').canReorder;
var extractProperties = require('./extract-properties');
var optimizeProperties = require('./properties/optimize');
var serializeRules = require('../../writer/one-time').rules;
var Token = require('../../tokenizer/token');
function mergeNonAdjacentBySelector(tokens, context) {
var specificityCache = context.cache.specificity;
var allSelectors = {};
var repeatedSelectors = [];
var i;
for (i = tokens.length - 1; i >= 0; i--) {
if (tokens[i][0] != Token.RULE)
continue;
if (tokens[i][2].length === 0)
continue;
var selector = serializeRules(tokens[i][1]);
allSelectors[selector] = [i].concat(allSelectors[selector] || []);
if (allSelectors[selector].length == 2)
repeatedSelectors.push(selector);
}
for (i = repeatedSelectors.length - 1; i >= 0; i--) {
var positions = allSelectors[repeatedSelectors[i]];
selectorIterator:
for (var j = positions.length - 1; j > 0; j--) {
var positionOne = positions[j - 1];
var tokenOne = tokens[positionOne];
var positionTwo = positions[j];
var tokenTwo = tokens[positionTwo];
directionIterator:
for (var direction = 1; direction >= -1; direction -= 2) {
var topToBottom = direction == 1;
var from = topToBottom ? positionOne + 1 : positionTwo - 1;
var to = topToBottom ? positionTwo : positionOne;
var delta = topToBottom ? 1 : -1;
var moved = topToBottom ? tokenOne : tokenTwo;
var target = topToBottom ? tokenTwo : tokenOne;
var movedProperties = extractProperties(moved);
while (from != to) {
var traversedProperties = extractProperties(tokens[from]);
from += delta;
// traversed then moved as we move selectors towards the start
var reorderable = topToBottom ?
canReorder(movedProperties, traversedProperties, specificityCache) :
canReorder(traversedProperties, movedProperties, specificityCache);
if (!reorderable && !topToBottom)
continue selectorIterator;
if (!reorderable && topToBottom)
continue directionIterator;
}
if (topToBottom) {
Array.prototype.push.apply(moved[2], target[2]);
target[2] = moved[2];
} else {
Array.prototype.push.apply(target[2], moved[2]);
}
optimizeProperties(target[2], true, true, context);
moved[2] = [];
}
}
}
}
module.exports = mergeNonAdjacentBySelector;
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