Rst-selector-parser NPM

rst-selector-parser

This is a fork of scalpel intended for use with enzyme for traversing a React Standard Tree (RST) using CSS selectors, with minor divergences.

Usage

import {
  createGenerator,
  createParser
} from 'rst-selector-parser';

const generator = createGenerator();
const parser = createParser();

const tokens: Array<SelectorTokenType | CombinatorTokenType> = parser.parse('.foo.bar');

// [
//   {
//     type: 'selector',
//     body: [
//       {
//         type: 'classSelector',
//         name: 'foo'
//       },
//       {
//         type: 'classSelector',
//         name: 'bar'
//       }
//     ]
//   }
// ]

const selector: string = generator.generate(token);

// .foo.bar

Note:
For programmatic type definitions, refer to ./src/types.js.

Token types

Type	Description	Example
`adjacentSiblingCombinator`	An adjacent sibling combinator.	`.baz0 + .baz1`
`attributePresenceSelector`	An attribute presence selector.	`[qux]`
`attributeValueSelector`	An attribute value selector.	`[qux=val]`, `[qux~=val]`
`childCombinator`	A child combinator.	`.baz0 > .baz1`
`classSelector`	A class selector.	`.baz`
`descendantCombinator`	A descendant combinator.	`.baz0 .baz1`
`generalSiblingCombinator`	A general sibling combinator.	`.baz0 ~ .baz1`
`idSelector`	An ID selector	`#bar`
`pseudoClassSelector`	A pseudo-class selector.	`:corge`, `:corge()`, `:corge(val0, 'val1', "val2")`
`pseudoElementSelector`	A pseudo-element selector.	`::grault`
`typeSelector`	A type selector.	`foo`
`universalSelector`	A universal selector.	`*`

Fields

Tokens have fields that describe additional information about the token. Fields are token type specific.

`adjacentSiblingCombinator`

Name	Description	Example
`type`	Name of the token type.	"adjacentSiblingCombinator"

`attributePresenceSelector`

Name	Description	Example
`name`	Name of the element attribute.	"qux" in `[qux]`
`type`	Name of the token type.	"attributePresenceSelector"

`attributeValueSelector`

Name	Description	Example
`name`	Name of the element attribute.	"qux" in `[qux]`
`operator`	Operator of the expression.	"=" in `[qux=val]`
`type`	Name of the token type.	"attributeValueSelector"
`value`	Value of the expression.	"val" in `[qux=val]`

`childCombinator`

Name	Description	Example
`type`	Name of the token type.	"childCombinator"

`classSelector`

Name	Description	Example
`name`	Class name.	"baz" in `.baz[qux]`
`type`	Name of the token type.	"classSelector"

`descendantCombinator`

Name	Description	Example
`type`	Name of the token type.	"descendantCombinator"

`generalSiblingCombinator`

Name	Description	Example
`type`	Name of the token type.	"generalSiblingCombinator"

`idSelector`

Name	Description	Example
`name`	Name of the ID.	"bar" in `#bar:corge()`
`type`	Name of the token type.	"idSelector"

`pseudoClassSelector`

Name	Description	Example
`name`	Name of the pseudo-class.	"corge" in `#bar:corge()`
`parameters`	Array of parameter values.	"var0", "var1" and "var2" in `:corge(var0, 'var1', "var2")`
`type`	Name of the token type.	"pseudoClassSelector"

`pseudoElementSelector`

Name	Description	Example
`name`	Name of the pseudo-element.	"grault" in `#bar::grault`
`type`	Name of the token type.	"pseudoElementSelector"

`typeSelector`

Name	Description	Example
`name`	Name of the node.	"foo" in `foo#bar.baz`
`type`	Name of the token type.	"typeSelector"

`universalSelector`

Name	Description	Example
`type`	Name of the token type.	"universalSelector"

Development

git pull git@github.com:gajus/scalpel.git
cd ./scalpel
npm install
npm run test

The parser grammar is in the ./src/grammar.ne file. After making changes to the parser grammar, you need to compile the parser using npm run compile-grammar command.

Note:
This parser could be extended to support the entire CSS grammar. I don't have such a use case. However, should you want to add new grammar, raise an issue.

Usage

import {
  createGenerator,
  createParser
} from 'scalpel';

const generator = createGenerator();
const parser = createParser();

const tokens: Array<SelectorTokenType | CombinatorTokenType> = parser.parse('.foo.bar');

// [
//   {
//     type: 'selector',
//     body: [
//       {
//         type: 'classSelector',
//         name: 'foo'
//       },
//       {
//         type: 'classSelector',
//         name: 'bar'
//       }
//     ]
//   }
// ]

const selector: string = generator.generate(token);

// .foo.bar

Note:
For programmatic type definitions, refer to ./src/types.js.

Token types

Type	Description	Example
`adjacentSiblingCombinator`	An adjacent sibling combinator.	`.baz0 + .baz1`
`attributePresenceSelector`	An attribute presence selector.	`[qux]`
`attributeValueSelector`	An attribute value selector.	`[qux=val]`, `[qux~=val]`
`childCombinator`	A child combinator.	`.baz0 > .baz1`
`classSelector`	A class selector.	`.baz`
`descendantCombinator`	A descendant combinator.	`.baz0 .baz1`
`generalSiblingCombinator`	A general sibling combinator.	`.baz0 ~ .baz1`
`idSelector`	An ID selector	`#bar`
`pseudoClassSelector`	A pseudo-class selector.	`:corge`, `:corge()`, `:corge(val0, 'val1', "val2")`
`pseudoElementSelector`	A pseudo-element selector.	`::grault`
`typeSelector`	A type selector.	`foo`
`universalSelector`	A universal selector.	`*`

Fields

Tokens have fields that describe additional information about the token. Fields are token type specific.

`adjacentSiblingCombinator`

Name	Description	Example
`type`	Name of the token type.	"adjacentSiblingCombinator"

`attributePresenceSelector`

Name	Description	Example
`name`	Name of the element attribute.	"qux" in `[qux]`
`type`	Name of the token type.	"attributePresenceSelector"

`attributeValueSelector`

Name	Description	Example
`name`	Name of the element attribute.	"qux" in `[qux]`
`operator`	Operator of the expression.	"=" in `[qux=val]`
`type`	Name of the token type.	"attributeValueSelector"
`value`	Value of the expression.	"val" in `[qux=val]`

`childCombinator`

Name	Description	Example
`type`	Name of the token type.	"childCombinator"

`classSelector`

Name	Description	Example
`name`	Class name.	"baz" in `.baz[qux]`
`type`	Name of the token type.	"classSelector"

`descendantCombinator`

Name	Description	Example
`type`	Name of the token type.	"descendantCombinator"

`generalSiblingCombinator`

Name	Description	Example
`type`	Name of the token type.	"generalSiblingCombinator"

`idSelector`

Name	Description	Example
`name`	Name of the ID.	"bar" in `#bar:corge()`
`type`	Name of the token type.	"idSelector"

`pseudoClassSelector`

Name	Description	Example
`name`	Name of the pseudo-class.	"corge" in `#bar:corge()`
`parameters`	Array of parameter values.	"var0", "var1" and "var2" in `:corge(var0, 'var1', "var2")`
`type`	Name of the token type.	"pseudoClassSelector"

`pseudoElementSelector`

Name	Description	Example
`name`	Name of the pseudo-element.	"grault" in `#bar::grault`
`type`	Name of the token type.	"pseudoElementSelector"

`typeSelector`

Name	Description	Example
`name`	Name of the node.	"foo" in `foo#bar.baz`
`type`	Name of the token type.	"typeSelector"

`universalSelector`

Name	Description	Example
`type`	Name of the token type.	"universalSelector"

Development

git pull git@github.com:gajus/scalpel.git
cd ./scalpel
npm install
npm run test

The parser grammar is in the ./src/grammar.ne file. After making changes to the parser grammar, you need to compile the parser using npm run compile-grammar command.

Note:
This parser could be extended to support the entire CSS grammar. I don't have such a use case. However, should you want to add new grammar, raise an issue.

Usage

import {
  createGenerator,
  createParser
} from 'scalpel';

const generator = createGenerator();
const parser = createParser();

const tokens: Array<SelectorTokenType | CombinatorTokenType> = parser.parse('.foo.bar');

// [
//   {
//     type: 'selector',
//     body: [
//       {
//         type: 'classSelector',
//         name: 'foo'
//       },
//       {
//         type: 'classSelector',
//         name: 'bar'
//       }
//     ]
//   }
// ]

const selector: string = generator.generate(token);

// .foo.bar

Note:
For programmatic type definitions, refer to ./src/types.js.

Token types

Type	Description	Example
`adjacentSiblingCombinator`	An adjacent sibling combinator.	`.baz0 + .baz1`
`attributePresenceSelector`	An attribute presence selector.	`[qux]`
`attributeValueSelector`	An attribute value selector.	`[qux=val]`, `[qux~=val]`
`childCombinator`	A child combinator.	`.baz0 > .baz1`
`classSelector`	A class selector.	`.baz`
`descendantCombinator`	A descendant combinator.	`.baz0 .baz1`
`generalSiblingCombinator`	A general sibling combinator.	`.baz0 ~ .baz1`
`idSelector`	An ID selector	`#bar`
`pseudoClassSelector`	A pseudo-class selector.	`:corge`, `:corge()`, `:corge(val0, 'val1', "val2")`
`pseudoElementSelector`	A pseudo-element selector.	`::grault`
`typeSelector`	A type selector.	`foo`
`universalSelector`	A universal selector.	`*`

Fields

Tokens have fields that describe additional information about the token. Fields are token type specific.

`adjacentSiblingCombinator`

Name	Description	Example
`type`	Name of the token type.	"adjacentSiblingCombinator"

`attributePresenceSelector`

Name	Description	Example
`name`	Name of the element attribute.	"qux" in `[qux]`
`type`	Name of the token type.	"attributePresenceSelector"

`attributeValueSelector`

Name	Description	Example
`name`	Name of the element attribute.	"qux" in `[qux]`
`operator`	Operator of the expression.	"=" in `[qux=val]`
`type`	Name of the token type.	"attributeValueSelector"
`value`	Value of the expression.	"val" in `[qux=val]`

`childCombinator`

Name	Description	Example
`type`	Name of the token type.	"childCombinator"

`classSelector`

Name	Description	Example
`name`	Class name.	"baz" in `.baz[qux]`
`type`	Name of the token type.	"classSelector"

`descendantCombinator`

Name	Description	Example
`type`	Name of the token type.	"descendantCombinator"

`generalSiblingCombinator`

Name	Description	Example
`type`	Name of the token type.	"generalSiblingCombinator"

`idSelector`

Name	Description	Example
`name`	Name of the ID.	"bar" in `#bar:corge()`
`type`	Name of the token type.	"idSelector"

`pseudoClassSelector`

Name	Description	Example
`name`	Name of the pseudo-class.	"corge" in `#bar:corge()`
`parameters`	Array of parameter values.	"var0", "var1" and "var2" in `:corge(var0, 'var1', "var2")`
`type`	Name of the token type.	"pseudoClassSelector"

`pseudoElementSelector`

Name	Description	Example
`name`	Name of the pseudo-element.	"grault" in `#bar::grault`
`type`	Name of the token type.	"pseudoElementSelector"

`typeSelector`

Name	Description	Example
`name`	Name of the node.	"foo" in `foo#bar.baz`
`type`	Name of the token type.	"typeSelector"

`universalSelector`

Name	Description	Example
`type`	Name of the token type.	"universalSelector"

Development

git pull git@github.com:gajus/scalpel.git
cd ./scalpel
npm install
npm run test

The parser grammar is in the ./src/grammar.ne file. After making changes to the parser grammar, you need to compile the parser using npm run compile-grammar command.

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