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+#CSSselect [](http://travis-ci.org/fb55/CSSselect) |
+ |
+a CSS selector compiler/engine |
+ |
+##What? |
+ |
+CSSselect turns CSS selectors into functions that tests if elements match them. When searching for elements, testing is executed "from the top", similar to how browsers execute CSS selectors. |
+ |
+In its default configuration, CSSselect queries the DOM structure of the [`domhandler`](https://github.com/fb55/domhandler) module. |
+ |
+##API |
+ |
+```js |
+var CSSselect = require("CSSselect"); |
+``` |
+ |
+####`CSSselect(query, elems)` |
+ |
+- `query` can be either a function or a string. If it's a string, the string is compiled as a CSS selector. |
+- `elems` can be either an array of elements, or a single element. If it is an element, its children will be used (so we're working with an array again). |
+ |
+Queries `elems`, returns an array containing all matches. |
+ |
+Aliases: `CSSselect.selectAll(query, elems)`, `CSSselect.iterate(query, elems)`. |
+ |
+####`CSSselect.compile(query)` |
+ |
+Compiles the query, returns the function. |
+ |
+####`CSSselect.is(elem, query)` |
+ |
+Tests whether or not an element is matched by `query`. `query` can be either a CSS selector or a function. |
+ |
+####`CSSselect.selectOne(query, elems)` |
+ |
+Arguments are the same as for `CSSselect(query, elems)`. Only returns the first match, or `null` if there was no match. |
+ |
+##Why? |
+ |
+The common approach of executing CSS selectors (used eg. by [`Sizzle`](https://github.com/jquery/sizzle), [`nwmatcher`](https://github.com/dperini/nwmatcher/) and [`qwery`](https://github.com/ded/qwery)) is to execute every component of the selector in order, from left to right. The selector `a b` for example will first look for `a` elements, then search these for `b` elements. |
+ |
+While this works, it has some downsides: Children of `a`s will be checked multiple times, first, to check if they are also `a`s, then, for every superior `a` once, if they are `b`s. Using [Big O notation](http://en.wikipedia.org/wiki/Big_O_notation), that would be `O(n^2)`. |
+ |
+The far more efficient approach is to first look for `b` elements, then check if they have superior `a` elements: Using big O notation again, that would be `O(n)`. |
+ |
+And that's exactly what CSSselect does. |
+ |
+##How? |
+ |
+By stacking functions! |
+ |
+_//TODO: Better explanation. For now, if you're interested, have a look at the source code._ |
+ |
+ |
+--- |
+ |
+License: BSD-like |