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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- Fix infinite loop on value parse (#328)

- 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)

var TokenType = require('./const').TokenType;

specialFunctions[SCOPE_ATRULE_EXPRESSION] = {

    atruleExpression: getAtruleExpression,

    } else if (scanner.prevToken !== null) {

        lines = scanner.prevToken.value.trimRight();

        offset = scanner.prevToken.offset + lines.length;

        lines = lines.split(/\n|\r\n?|\f/);

        line = scanner.prevToken.line + lines.length - 1;

            ? lines[lines.length - 1].length + 1

            : scanner.prevToken.column + lines[lines.length - 1].length;

    if (scanner.token !== null && scanner.token.type === tokenType) {

    parseError(tokenType + ' is expected');

        if (scanner.token.type === TokenType.Identifier &&

            scanner.token.value.toLowerCase() === name) {

    parseError('Identifier `' + name + '` is expected');

                child = getAny(SCOPE_VALUE);

            node.sequence.insert(List.createItem(child));

                if (scanner.token !== null) {

                    if (scanner.token.type === TokenType.PercentSign) {

                        return getPercentage(number);

                    } else if (scanner.token.type === TokenType.Identifier) {

                        return getDimension(number.value);

            if (scanner.token.type === TokenType.HyphenMinus) {

                var next = scanner.lookup(1);

                if (next && (next.type === TokenType.Identifier || next.type === TokenType.HyphenMinus)) {

            if (scanner.token.type === TokenType.HyphenMinus ||

                scanner.token.type === TokenType.PlusSign) {

            parseError('Unexpected input');

    if (scanner.token !== null && scanner.token.type === TokenType.LeftParenthesis) {

        return getFunction(scope, ident);

    expectAny('Attribute selector (=, ~=, ^=, $=, *=, |=)',

        TokenType.EqualsSign,        // =

        TokenType.Tilde,             // ~=

        TokenType.CircumflexAccent,  // ^=

        TokenType.DollarSign,        // $=

        TokenType.Asterisk,          // *=

        TokenType.VerticalLine       // |=

    if (scanner.token.type === TokenType.EqualsSign) {

        name = scanner.token.value + '=';

// '[' S* attrib_name S* attrib_match S* [ IDENT | STRING ] S* attrib_flags? S* ']'

  "description": "CSSO (CSS Optimizer) is a CSS minifier with structural optimisations",

		@@ -0,1 +1,5 @@
		## 2.3.2 (March 11, 2016)

		- Fix infinite loop on value parse (#328)

		## 2.3.1 (January 6, 2016)
		@@ -2,0 +6,0 @@

		@@ -648,4 +648,4 @@ 'use strict';
		};
		break;
		}
		break;
		}
		@@ -652,0 +652,0 @@ }

		{
		"name": "csso",
		"version": "2.3.1",
		"version": "2.3.2",
		"description": "CSSO (CSS Optimizer) is a CSS minifier with structural optimisations",
		@@ -5,0 +5,0 @@ "keywords": [

Improved metrics