brettstimmermanmensch 
A decent CSS parser.
usage
npm install menschvar mensch = require('mensch');
var ast = mensch.parse('p { color: black; }');
var css = mensch.stringify(ast);
console.log(css);
// => p { color: black; }api
parse(css, [options={}])
Convert a CSS string or an array of lexical tokens into a stringify-able AST.
css{String|Array} CSS string or array of lexical tokens[options]{Object}[options.comments=false]{Boolean} Allow comment nodes in the AST.[options.position=false]{Boolean} Allow line/column position in the AST.
When {position: true}, AST node will have a position property:
{
type: 'comment',
text: ' Hello World! ',
position: {
start: { line: 1, col: 1 },
end: { line 1, col: 18 }
}
}stringify(ast, [options={}])
Convert a stringify-able AST into a CSS string.
ast{Object} Astringify-able AST[options]{Object}[options.comments=false]{Boolean} Allow comments in the stringified CSS.[options.indentation='']{String} E.g.,indentation: ' 'will indent by two spaces.
lex(css)
Convert a CSS string to an array of lexical tokens for use with .parse().
css{String} CSS
non-validating
Mensch is a non-validating CSS parser. While it can handle the major language
constructs just fine, and it can recover from gaffes like mis-matched braces and
missing or extraneous semi-colons, mensch can't tell you when it finds
invalid CSS like a misspelled property name or a misplaced @import.
comments
Unlike most CSS parsers, mensch allows comments to be represented in the AST and
subsequently stringified with the {comments: true} option.
var options = { comments: true };var ast = mensch.parse('.red { color: red; /* Natch. */ }', options);
var css = mensch.stringify(ast, options);
console.log(css);
//=> .red { color: red; /* Natch. */ }However, comments within the context of a selector, property, etc., will be ignored. These comments are difficult to represent in the AST.
var ast = mench.parse('.red /*1*/ { color /*2*/: /*3*/ red /*4*/; }', options);
var css = mesch.stringify(ast, options);
console.log(css);
//=> .red { color: red; }ast
The structure of mensch's AST riffs on several existing CSS parsers, but it might not be 100% compatible with other CSS parsers. Here it is in a nutshell:
{
type: 'stylesheet'
stylesheet: {
rules: [{
type: 'rule',
selectors: ['.foo'],
declarations: [{
type: 'property',
name: 'color',
value: 'black'
}]
}]
}
}credits
Mensch is based on several existing CSS parsers, but nzakas/parser-lib and visionmedia/css are notable influences.
known users
voidlabs/mosaico uses Mensch parser to parse custom-flavored CSS rules in email templates and make the template editable: positions, comment parsing, multiple declarations for the same property have been keys to the choice of Mensch!
Automattic/juice moved to Mensch CSS parser since 3.0 release in order to fix dozen of issues with the previous parser, expecially with support for "multiple properties declarations" in the same ruleset and with invalid values.
Please let us know if you use Mensch in your library!