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@bem/import-notation
Advanced tools
Tool for working with BEM import strings.
Extract BEM entities from import strings.
npm install --save @bem/import-notation
import {parse} from '@bem/import-notation';
parse('b:button e:text'); // → [ { block : 'button', elem : 'text' } ]
parse('b:button m:theme=normal|action');
// → [ { block : 'button' },
// { block : 'button', mod : { name: 'theme' } },
// { block : 'button', mod : { name: 'theme', val : 'normal' } },
// { block : 'button', mod : { name: 'theme', val : 'action' } } ]
Parameter | Type | Description |
---|---|---|
str | string | BEM import notation check notation section |
ctx | object | BEM entity name representation. |
Parses the string into BEM entities.
Example:
var entity = parse('b:button e:text')[0];
entity.block // → 'button'
entity.elem // → 'text'
Context allows to extract portion of entities.
var enties = parse('m:theme=normal', { block: 'button' });
// → [ { block: 'button' },
// { block: 'button', mod: { name: 'theme' } },
// { block: 'button', mod: { name: 'theme', val: 'normal' } } ]
Parameter | Type | Description |
---|---|---|
entities | array | Array of BEM entities to merge into import string notation |
Forms a string from BEM entities. Be aware to merge only one type of entities. The array should contains one block or one elem and optionally it's modifiers.
This section describes all possible syntax of BEM import strings. Examples are provided in es6 syntax. Note that parse function only works with strings.
Right now order of fields is important, check issue:
b:
e:
m:
t:
import 'b:button';
// → [ { block: 'button' } ]
import 'b:popup m:autoclosable';
// → [ { block: 'popup', mod: { name: 'autoclosable' } } ]
import 'b:button m:theme=active';
// → [ { block: 'button', mod: { name: 'theme' } }
// { block: 'button', mod: { name: 'theme', val: 'active' } } ]
import 'b:button m:theme=active m:size=m';
// → [ { block: 'button' },
// { block: 'button', mod: { name: 'theme' } },
// { block: 'button', mod: { name: 'theme', val: 'active' } },
// { block: 'button', mod: { name: 'size' } },
// { block: 'button', mod: { name: 'size', val: 'm' } } ]
import 'b:button m:theme=normal|active';
// → [ { block: 'button' },
// { block: 'button', mod: { name: 'theme' } },
// { block: 'button', mod: { name: 'theme', val: 'normal' } },
// { block: 'button', mod: { name: 'theme', val: 'active' } } ]
import 'b:button e:text';
// → [ { block: 'button', elem: 'text' } ]
import 'b:popup e:tail m:autoclosable';
// → [ { block: 'popup', elem: 'tail' },
// { block: 'popup', elem: 'tail', mod: { name: 'autoclosable' } } ]
import 'b:button e:text m:theme=active';
// → [ { block: 'button', elem: 'text' },
// { block: 'button', elem: 'text', mod: { name: 'theme' } },
// { block: 'button', elem: 'text', mod: { name: 'theme', val: 'active' } } ]
import 'b:button e:text m:theme=active m:size=m';
// → [ { block: 'button', elem: 'text' },
// { block: 'button', elem: 'text', mod: { name: 'theme' } },
// { block: 'button', elem: 'text', mod: { name: 'theme', val: 'active' } },
// { block: 'button', elem: 'text', mod: { name: 'size' } },
// { block: 'button', elem: 'text', mod: { name: 'size', val: 'm' } } ]
import 'b:button e:text m:theme=normal|active';
// → [ { block: 'button', elem: 'text' },
// { block: 'button', elem: 'text', mod: { name: 'theme' } },
// { block: 'button', elem: 'text', mod: { name: 'theme', val: 'normal' } },
// { block: 'button', elem: 'text', mod: { name: 'theme', val: 'active' } } ]
Technology is abstraction for extension on file system. Check docs.
Specify field t:
to extract BEM entities with concretele technology.
import 'b:button t:css';
// → [ { block: 'button', tech: 'css' } ]
import 'b:button m:theme=active t:js';
// → [ { block: 'button', tech: 'js' },
// { block: 'button', mod: { name: 'theme' }, tech: 'js' },
// { block: 'button', mod: { name: 'theme', val: 'active' }, tech: 'js' } ]
import 'b:button e:text m:theme=normal|active t:css';
// → [ { block: 'button', elem: 'text', tech: 'css' },
// { block: 'button', elem: 'text', mod: { name: 'theme' }, tech: 'css' },
// { block: 'button', elem: 'text', mod: { name: 'theme', val: 'normal' }, tech: 'css' },
// { block: 'button', elem: 'text', mod: { name: 'theme', val: 'active' }, tech: 'css' } ]
Code and documentation copyright 2017 YANDEX LLC. Code released under the Mozilla Public License 2.0.
FAQs
BEM import notation parser
The npm package @bem/import-notation receives a total of 27 weekly downloads. As such, @bem/import-notation popularity was classified as not popular.
We found that @bem/import-notation demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 6 open source maintainers collaborating on the project.
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