CSS 風宣言パーサ

attrParser.js

var parse = (function () {
	var cb = '\\', cd = '"', cq = "'";
	var re = /\\(?=[;/*])/g, rc = /\\(?=:)/g, rt = /[^\s]/;
	function slice(css, h, i) {
		return css.substring(h, i).replace(re, '');
	}
	function prop(css, h, i) {
		return slice(css, h, i).replace(rc, '');
	}
	function trim(s) {
		var i = s.search(rt), j = i, k = j;
		for (var c; c = s.charAt(k); k++) {
			if (c == cb) { j = ++k; continue; }
			if (rt.test(c)) j = k;
			if (c == cd || c == cq) {
				var d;
				while (d = s.charAt(++k)) {
					if (d == cb) { k++; continue; }
					if (d == c) break;
				}
				j = k;
			}
		}
		return s.substring(i, j + 1);
	}
	function parse(css) {
		var decs = {}; var i = 0;
		for (var c; c = css.charAt(i); i++) {
			var s = '', p = null;
			var h = i;
			var f = false;
			do {
				if (c == cb) {
					f = false;
					i++; continue;
				}
				if (f && c == '*') {
					f = false;
					s += slice(css, h, i - 1);
					i = css.indexOf('*/', i + 1) + 1 || css.length;
					h = i + 1;
					continue;
				}
				f = c == '/';
				if (c == ';') break;
				if (p == null && c == ':') {
					p = trim(s + prop(css, h, i));
					s = '';
					h = i + 1;
					continue;
				}
				if (c != cd && c != cq) continue;
				s += slice(css, h, i);
				h = i++;
				for (var d; d = css.charAt(i); i++) {
					if (d == cb) { i++; continue; }
					if (d == c) break;
				}
				s += css.substring(h, i + 1);
				h = i + 1;
			} while (c = css.charAt(++i));
			if (p == null) {
				p = trim(s + prop(css, h, i));
				if (p) decs[p] = null;
			} else {
				decs[p] = trim(s + slice(css, h, i));
			}
		}
		return decs;
	}
	return parse;
})();