CSSO (CSS Optimizer) is a CSS minifier with structural optimisations. 

CSS minifier with structural optimisations

tadatuta

lahmatiy

afelix

csso

CSSO (CSS Optimizer) is a CSS minifier with structural optimisations

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- Added `beforeCompress` and `afterCompress` options support (#316)

- Fixed crash on empty argument in function (#317)

- Fixed shorthand optimisation issue when value has a color value or something unknown (#311)

- Implement AST cloning by adding `clone()` [function](https://github.com/css/csso#cloneast) and `clone` [option](https://github.com/css/csso#compressast-options) for `compress()` function (#296)

- Fix parse and translate attribute selector with flags but w/o operator (i.e. `[attrName i]`)

- Don't merge rules with flagged attribute selectors with others (#291)

- Take in account functions when merge TRBL-properties (#297, thanks to @ArturAralin)

- Tweak scanner, reduce code deoptimizations and other small improvements

- Fix wrong declaration with `\9` hack merge (#295)

- New option `comments` to specify what comments to left: `exclamation`, `first-exclamation` and `none`

- Add `offset` to CSS parse error details

- No more `gonzales` AST format and related code

- `minify()` and `minifyBlock()` is always return an object as result now (i.e. `{ css: String, map: SourceMapGenerator or null }`)

    - Returns AST in new format (so called `internal`)

    - New AST format + dynamic scanner = performance boost and less memory consumption

    - No more `context` argument, context should be specified via `options`

    - Supported contexts now: `stylesheet`, `atrule`, `atruleExpression`, `ruleset`, `selector`, `simpleSelector`, `block`, `declaration` and `value` 

    - Drop `needPositions` option, `positions` option should be used instead

    - Drop `needInfo` option, `info` object is attaching to nodes when some information is requested by `options`

    - `options` should be an object, otherwise it treats as empty object

    - No more AST converting (performance boost and less memory consumption)

    - Returns an object as result instead of AST (i.e. `{ ast: Object }`)

- Drop methods: `justDoIt()`, `stringify()`, `cleanInfo()`

- Don't remove spaces after function/braces/urls since unsafe (#289)

    - Filter rulesets by tag names, class names and ids white lists.

    - More aggressive ruleset moving using class name scopes information.

    - New CLI option `--usage` to pass usage data file.

    - Change order of ruleset processing, now it's left to right. Previously unmerged rulesets may prevent lookup and other rulesets merge.

    - Difference in pseudo signature just prevents ruleset merging, but don't stop lookup.

    - Simplify block comparison (performance).

- New method `csso.minifyBlock()` for css block compression (e.g. `style` attribute content).

- Ruleset merge improvement: at-rules with block (like `@media` or `@supports`) now can be skipped during ruleset merge lookup if doesn't contain something prevents it.

- FIX: Add negation (`:not()`) to pseudo signature to avoid unsafe merge (old browsers doesn't support it).

- FIX: Check nested parts of value when compute compatibility. It fixes unsafe property merging.

- pass block mode to tokenizer for correct parsing of declarations properties with `//` hack

- fix wrongly `@import` and `@charset` removal on double exclamation comment

- support for [CSS Custom Properties](https://www.w3.org/TR/css-variables/) (#279)

- rework RTBL properties merge – better merge for values with special units and don't merge values with CSS-wide keywords (#255)

- remove redundant universal selectors (#178)

- take in account `!important` when check for property overriding (#280)

- don't merge `text-align` declarations with some values (#281)

- add spaces around `/deep/` combinator on translate, since it together with universal selector can produce a comment

- better keyword and property name resolving (tolerant to hacks and so on)

    - compression log function could be customized by `logger` option for `compress()` and `minify()`

    - make possible to set initial line and column for parser

- add `file` to generated source map since other tools can relay on it in source map transform chain

- tweak some parse error messages and their positions

- fix `:not()` parsing and selector groups in `:not()` is supported now (#215)

- `needPosition` parser option is deprecated, `positions` option should be used instead (`needPosition` is used still if `positions` option omitted)

- expose internal AST API as `csso.internal.*`

- `minify()` adds `sourcesContent` by default when source map is generated

- bring back support for node.js `0.10` until major release (#275)

var List = require('../../utils/list.js');

var translate = require('../../utils/translate.js');

var walkRulesRight = require('../../utils/walk.js').rulesRight;

var SIDES = ['top', 'right', 'bottom', 'left'];

    'border-right-color': 'border-color',

    'border-bottom-color': 'border-color',

    'border-right-width': 'border-width',

    'border-bottom-width': 'border-width',

    'border-right-style': 'border-style',

    'border-bottom-style': 'border-style',

TRBL.prototype.getValueSequence = function(value, count) {

    var hasBadValues = value.sequence.some(function(child) {

                        iehack = child.name;

                        special = child.name;

                    // is not supported until IE11

                    // v* units is too buggy across browsers and better

                    // don't merge values with those units

                    case 'vm': // IE9 supporting "vm" instead of "vmin".

                        special = child.unit;

                return false; // ignore space

                return true;  // bad value

    if (hasBadValues || values.length > count) {

    if (typeof this.iehack === 'boolean' && this.iehack !== iehack) {

    if (typeof this.iehack === 'string' && this.iehack !== iehack) {

    this.iehack = iehack; // move outside

TRBL.prototype.canOverride = function(side, value) {

    return !currentValue || (value.important && !currentValue.important);

TRBL.prototype.add = function(name, value, info) {

            if (side in sides === false) {

            var values = this.getValueSequence(value, 1);

            if (!values || !values.length) {

            // can mix only if specials are equal

                if (sides[key] !== null && sides[key].special !== values[0].special) {

            if (!this.canOverride(side, values[0])) {

            var values = this.getValueSequence(value, 4);

                    values[RIGHT] = values[TOP];

                    values[BOTTOM] = values[TOP];

                    values[LEFT] = values[TOP];

                    values[LEFT] = values[RIGHT];

		@@ -0,1 +1,5 @@
		## 2.3.1 (January 6, 2016)

		- Added `\0` IE hack support (#320)

		## 2.3.0 (October 25, 2016)
		@@ -2,0 +6,0 @@

		@@ -80,3 +80,3 @@ var List = require('../../utils/list.js');
		var values = [];
		var iehack = false;
		var iehack = '';
		var hasBadValues = value.sequence.some(function(child) {
		@@ -88,4 +88,5 @@ var special = false;
		switch (child.name) {
		case '\\0':
		case '\\9':
		iehack = true;
		iehack = child.name;
		return;
		@@ -146,3 +147,3 @@

		if (typeof this.iehack === 'boolean' && this.iehack !== iehack) {
		if (typeof this.iehack === 'string' && this.iehack !== iehack) {
		return false;
		@@ -307,3 +308,3 @@ }
		info: {},
		name: '\\9'
		name: this.iehack
		});
		@@ -310,0 +311,0 @@ }

		@@ -75,3 +75,3 @@ var resolveProperty = require('../../utils/names.js').property;
		var vendorId = '';
		var hack9 = '';
		var iehack = '';
		var special = {};
		@@ -94,4 +94,4 @@

		if (/\\9/.test(name)) {
		hack9 = name;
		if (/\\[09]/.test(name)) {
		iehack = RegExp.lastMatch;
		}
		@@ -156,3 +156,3 @@

		fingerprint = '\|' + Object.keys(special).sort() + '\|' + hack9 + vendorId;
		fingerprint = '\|' + Object.keys(special).sort() + '\|' + iehack + vendorId;

		@@ -159,0 +159,0 @@ fingerprints[declarationId] = fingerprint;

		{
		"name": "csso",
		"version": "2.3.0",
		"version": "2.3.1",
		"description": "CSSO (CSS Optimizer) is a CSS minifier with structural optimisations",
		@@ -5,0 +5,0 @@ "keywords": [

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