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-# postcss-media-query-parser
-
-[![NPM version](http://img.shields.io/npm/v/postcss-media-query-parser.svg)](https://www.npmjs.com/package/postcss-media-query-parser) [![Build Status](https://travis-ci.org/dryoma/postcss-media-query-parser.svg?branch=master)](https://travis-ci.org/dryoma/postcss-media-query-parser)
-
-Media query parser with very simple traversing functionality.
-
-## Installation and usage
-
-First install it via NPM:
-
-```
-npm install postcss-media-query-parser
-```
-
-Then in your Node.js application:
-
-```js
-import mediaParser from "postcss-media-query-parser";
-
-const mediaQueryString = "(max-width: 100px), not print";
-const result = mediaParser(mediaQueryString);
-```
-
-The `result` will be this object:
-
-```js
-{
- type: 'media-query-list',
- value: '(max-width: 100px), not print',
- after: '',
- before: '',
- sourceIndex: 0,
-
- // the first media query
- nodes: [{
- type: 'media-query',
- value: '(max-width: 100px)',
- before: '',
- after: '',
- sourceIndex: 0,
- parent: <link to parent 'media-query-list' node>,
- nodes: [{
- type: 'media-feature-expression',
- value: '(max-width: 100px)',
- before: '',
- after: '',
- sourceIndex: 0,
- parent: <link to parent 'media-query' node>,
- nodes: [{
- type: 'media-feature',
- value: 'max-width',
- before: '',
- after: '',
- sourceIndex: 1,
- parent: <link to parent 'media-feature-expression' node>,
- }, {
- type: 'colon',
- value: ':',
- before: '',
- after: ' ',
- sourceIndex: 10,
- parent: <link to parent 'media-feature-expression' node>,
- }, {
- type: 'value',
- value: '100px',
- before: ' ',
- after: '',
- sourceIndex: 12,
- parent: <link to parent 'media-feature-expression' node>,
- }]
- }]
- },
- // the second media query
- {
- type: 'media-query',
- value: 'not print',
- before: ' ',
- after: '',
- sourceIndex: 20,
- parent: <link to parent 'media-query-list' node>,
- nodes: [{
- type: 'keyword',
- value: 'not',
- before: ' ',
- after: ' ',
- sourceIndex: 20,
- parent: <link to parent 'media-query' node>,
- }, {
- type: 'media-type',
- value: 'print',
- before: ' ',
- after: '',
- sourceIndex: 24,
- parent: <link to parent 'media-query' node>,
- }]
- }]
-}
-```
-
-One of the likely sources of a string to parse would be traversing [a PostCSS container node](http://api.postcss.org/Root.html) and getting the `params` property of nodes with the name of "atRule":
-
-```js
-import postcss from "postcss";
-import mediaParser from "postcss-media-query-parser";
-
-const root = postcss.parse(<contents>);
-// ... or any other way to get sucn container
-
-root.walkAtRules("media", (atRule) => {
- const mediaParsed = mediaParser(atRule.params);
- // Do something with "mediaParsed" object
-});
-```
-
-## Nodes
-
-Node is a very generic item in terms of this parser. It's is pretty much everything that ends up in the parsed result. Each node has these properties:
-
-* `type`: the type of the node (see below);
-* `value`: the node's value stripped of trailing whitespaces;
-* `sourceIndex`: 0-based index of the node start relative to the source start (excluding trailing whitespaces);
-* `before`: a string that contain a whitespace between the node start and the previous node end/source start;
-* `after`: a string that contain a whitespace between the node end and the next node start/source end;
-* `parent`: a link to this node's parent node (a container).
-
-A node can have one of these types (according to [the 2012 CSS3 standard](https://www.w3.org/TR/2012/REC-css3-mediaqueries-20120619/)):
-
-* `media-query-list`: that is the root level node of the parsing result. A [container](#containers); its children can have types of `url` and `media-query`.
-* `url`: if a source is taken from a CSS `@import` rule, it will have a `url(...)` function call. The value of such node will be `url(http://uri-address)`, it is to be parsed separately.
-* `media-query`: such nodes correspond to each media query in a comma separated list. In the exapmle above there are two. Nodes of this type are [containers](#containers).
-* `media-type`: `screen`, `tv` and other media types.
-* `keyword`: `only`, `not` or `and` keyword.
-* `media-feature-expression`: an expression in parentheses that checks for a condition of a particular media feature. The value would be like this: `(max-width: 1000px)`. Such nodes are [containers](#containers). They always have a `media-feature` child node, but might not have a `value` child node (like in `screen and (color)`).
-* `media-feature`: a media feature, e.g. `max-width`.
-* `colon`: present if a media feature expression has a colon (e.g. `(min-width: 1000px)`, compared to `(color)`).
-* `value`: a media feature expression value, e.g. `100px` in `(max-width: 1000px)`.
-
-### Parsing details
-
-postcss-media-query-parser allows for cases of some **non-standard syntaxes** and tries its best to work them around. For example, in a media query from a code with SCSS syntax:
-
-```scss
-@media #{$media-type} and ( #{"max-width" + ": 10px"} ) { ... }
-```
-
-`#{$media-type}` will be the node of type `media-type`, alghough `$media-type`'s value can be `only screen`. And inside `media-feature-expression` there will only be a `media-feature` type node with the value of `#{"max-width" + ": 10px"}` (this example doesn't make much sense, it's for demo purpose).
-
-But the result of parsing **malformed media queries** (such as with incorrect amount of closing parens, curly braces, etc.) can be unexpected. For exapmle, parsing:
-
-```scss
-@media ((min-width: -100px)
-```
-
-would return a media query list with the single `media-query` node that has no child nodes.
-
-## Containers
-
-Containers are [nodes](#nodes) that have other nodes as children. Container nodes have an additional property `nodes` which is an array of their child nodes. And also these methods:
-
-* `each(callback)` - traverses the direct child nodes of a container, calling `callback` function for each of them. Returns `false` if traversing has stopped by means of `callback` returning `false`, and `true` otherwise.
-* `walk([filter, ]callback)` - traverses ALL descendant nodes of a container, calling `callback` function for each of them. Returns `false` if traversing has stopped by means of `callback` returning `false`, and `true` otherwise.
-
-In both cases `callback` takes these parameters:
-
-- `node` - the current node (one of the container's descendats, that the callback has been called against).
-- `i` - 0-based index of the `node` in an array of its parent's children.
-- `nodes` - array of child nodes of `node`'s parent.
-
-If `callback` returns `false`, the traversing stops.
-
-## License
-
-MIT