Initial drop

Author: ericf

.gitignore

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+node_modules/

LICENSE

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+Copyright 2014 Yahoo! Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+    * Neither the name of the Yahoo! Inc. nor the
+      names of its contributors may be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL YAHOO! INC. BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

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+CSS Media Match
+===============
+
+Determins if a givien CSS Media Query matches a set of values.
+
+
+License
+-------
+
+This software is free to use under the Yahoo! Inc. BSD license.
+See the [LICENSE file][] for license text and copyright information.
+
+
+[LICENSE file]: https://github.com/ericf/css-media-match/blob/master/LICENSE

index.js

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+/*
+Copyright (c) 2014, Yahoo! Inc. All rights reserved.
+Copyrights licensed under the New BSD License.
+See the accompanying LICENSE file for terms.
+*/
+
+'use strict';
+
+module.exports = match;
+
+// -----------------------------------------------------------------------------
+
+function match(mediaQuery, values) {
+    return parseQuery(mediaQuery);
+}
+
+// -- Utilities ----------------------------------------------------------------
+
+var RE_MEDIA_QUERY   = /(?:(only|not)?\s*([^\s\(\)]+)\s*and\s*)?(.+)?/i,
+    RE_MQ_EXPRESSION = /\(\s*([^\s\:\)]+)\s*(?:\:\s*([^\s\)]+))?\s*\)/,
+    RE_LENGTH_VALUE  = /(\d+)(em|rem|px|cm|mm|in|pt|pc)?/;
+
+function parseQuery(mediaQuery) {
+    return mediaQuery.split(',').map(function (query) {
+        var captures    = query.match(RE_MEDIA_QUERY),
+            modifier    = captures[1],
+            type        = captures[2],
+            expressions = captures[3],
+            parsed      = {};
+
+        parsed.only = !!modifier && modifier.toLowerCase() === 'only';
+        parsed.not  = !!modifier && modifier.toLowerCase() === 'not';
+        parsed.type = type ? type.toLowerCase() : 'all';
+
+        // Split expressions into a list.
+        expressions = expressions.match(/\([^\)]+\)/ig);
+
+        parsed.expressions = expressions.map(function (expression) {
+            var captures = expression.match(RE_MQ_EXPRESSION);
+
+            return {
+                feature: captures[1].toLowerCase(),
+                value  : captures[2]
+            };
+        });
+
+        return parsed;
+    });
+}
+
+function toPx(length) {
+    var captures = String(length).match(RE_LENGTH_VALUE),
+        value    = Number(captures[1]),
+        units    = captures[2];
+
+    switch (units) {
+        case 'em':
+        case 'rem':
+            return value * 16;
+        case 'cm':
+            return value * 96 / 2.54;
+        case 'mm':
+            return value * 96 / 2.54 / 10;
+        case 'in':
+            return value * 96;
+        case 'pt':
+            return value * 72;
+        case 'pc':
+            return value * 72 / 12;
+        default:
+            return value;
+    }
+}