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optimize.js
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optimize.js
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var mergeAdjacent = require('./merge-adjacent');
var mergeMediaQueries = require('./merge-media-queries');
var mergeNonAdjacentByBody = require('./merge-non-adjacent-by-body');
var mergeNonAdjacentBySelector = require('./merge-non-adjacent-by-selector');
var reduceNonAdjacent = require('./reduce-non-adjacent');
var removeDuplicateFontAtRules = require('./remove-duplicate-font-at-rules');
var removeDuplicateMediaQueries = require('./remove-duplicate-media-queries');
var removeDuplicates = require('./remove-duplicates');
var restructure = require('./restructure');
var optimizeProperties = require('./properties/optimize');
var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
var Token = require('../../tokenizer/token');
function removeEmpty(tokens) {
for (var i = 0, l = tokens.length; i < l; i++) {
var token = tokens[i];
var isEmpty = false;
switch (token[0]) {
case Token.RULE:
isEmpty = token[1].length === 0 || token[2].length === 0;
break;
case Token.BLOCK:
removeEmpty(token[2]);
isEmpty = token[2].length === 0;
break;
case Token.AT_RULE_BLOCK:
isEmpty = token[2].length === 0;
}
if (isEmpty) {
tokens.splice(i, 1);
i--;
l--;
}
}
}
function recursivelyOptimizeBlocks(tokens, context) {
for (var i = 0, l = tokens.length; i < l; i++) {
var token = tokens[i];
if (token[0] == Token.BLOCK) {
var isKeyframes = /@(-moz-|-o-|-webkit-)?keyframes/.test(token[1][0][1]);
level2Optimize(token[2], context, !isKeyframes);
}
}
}
function recursivelyOptimizeProperties(tokens, context) {
for (var i = 0, l = tokens.length; i < l; i++) {
var token = tokens[i];
switch (token[0]) {
case Token.RULE:
optimizeProperties(token[2], true, true, context);
break;
case Token.BLOCK:
recursivelyOptimizeProperties(token[2], context);
}
}
}
function level2Optimize(tokens, context, withRestructuring) {
var levelOptions = context.options.level[OptimizationLevel.Two];
var reduced;
var i;
recursivelyOptimizeBlocks(tokens, context);
recursivelyOptimizeProperties(tokens, context);
if (levelOptions.removeDuplicateRules) {
removeDuplicates(tokens, context);
}
if (levelOptions.mergeAdjacentRules) {
mergeAdjacent(tokens, context);
}
if (levelOptions.reduceNonAdjacentRules) {
reduceNonAdjacent(tokens, context);
}
if (levelOptions.mergeNonAdjacentRules && levelOptions.mergeNonAdjacentRules != 'body') {
mergeNonAdjacentBySelector(tokens, context);
}
if (levelOptions.mergeNonAdjacentRules && levelOptions.mergeNonAdjacentRules != 'selector') {
mergeNonAdjacentByBody(tokens, context);
}
if (levelOptions.restructureRules && levelOptions.mergeAdjacentRules && withRestructuring) {
restructure(tokens, context);
mergeAdjacent(tokens, context);
}
if (levelOptions.restructureRules && !levelOptions.mergeAdjacentRules && withRestructuring) {
restructure(tokens, context);
}
if (levelOptions.removeDuplicateFontRules) {
removeDuplicateFontAtRules(tokens, context);
}
if (levelOptions.removeDuplicateMediaBlocks) {
removeDuplicateMediaQueries(tokens, context);
}
if (levelOptions.mergeMedia) {
reduced = mergeMediaQueries(tokens, context);
for (i = reduced.length - 1; i >= 0; i--) {
level2Optimize(reduced[i][2], context, false);
}
}
removeEmpty(tokens);
return tokens;
}
module.exports = level2Optimize;