78 lines
2.5 KiB
JavaScript
78 lines
2.5 KiB
JavaScript
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;
|