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# CSS Modules: CSS selector Tokenizer
Parses and stringifies CSS selectors.
``` js
import Tokenizer from "css-selector-tokenizer";
let input = "a#content.active > div::first-line [data-content], a:not(:visited)";
Tokenizer.parse(input); // === expected
let expected = {
type: "selectors",
nodes: [
{
type: "selector",
nodes: [
{ type: "element", name: "a" },
{ type: "id", name: "content" },
{ type: "class", name: "active" },
{ type: "operator", operator: ">", before: " ", after: " " },
{ type: "element", name: "div" },
{ type: "pseudo-element", name: "first-line" },
{ type: "spacing", value: " " },
{ type: "attribute", content: "data-content" },
]
},
{
type: "selector",
nodes: [
{ type: "element", name: "a" },
{ type: "nested-pseudo-class", name: "not", nodes: [
{
type: "selector",
nodes: [
{ type: "pseudo-class", name: "visited" }
]
}
] }
],
before: " "
}
]
}
Tokenizer.stringify(expected) // === input
// * => { type: "universal" }
// foo|element = { type: "element", name: "element", namespace: "foo" }
// *|* = { type: "universal", namespace: "*" }
// :has(h1, h2) => { type: "nested-pseudo-class", name: "has", nodes: [
// {
// type: "selector",
// nodes: [
// { type: "element", name: "h1" }
// ]
// },
// {
// type: "selector",
// nodes: [
// { type: "element", name: "h2" }
// ],
// before: " "
// }
// ] }
```
## Building
```
npm install
npm test
```
[](https://travis-ci.org/css-modules/css-selector-tokenizer)
* Lines: [](https://coveralls.io/r/css-modules/css-selector-tokenizer?branch=master)
* Statements: [](http://codecov.io/github/css-modules/css-selector-tokenizer?branch=master)
## Development
- `npm autotest` will watch `lib` and `test` for changes and retest
## License
MIT
## With thanks
- Mark Dalgleish
- Glen Maddern
- Guy Bedford
---
Tobias Koppers, 2015.
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