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README.md

BemCell

NPM Status

Representation of identifier of a part of BEM entity.

Install

$ npm install --save @bem/sdk.cell

Usage

const BemCell = require('@bem/sdk.cell');
const BemEntityName = require('@bem/sdk.entity-name');

const cell = new BemCell({
    entity: new BemEntityName({ block: 'button', elem: 'text', mod: { name: 'theme', val: 'simple' } }),
    tech: 'css',
    layer: 'common'
});

cell.entity; // ➜ BemEntityName { block: 'button', elem: 'text' }
cell.tech;   // css
cell.layer;  // common
cell.id;     // button__text@common.css

cell.block;  // → button
cell.elem;   // → text
cell.mod;    // → { name: 'theme', val: 'simple' }

API

constructor(obj)

Parameter Type Description
obj.entity BemEntityName Representation of entity name
obj.tech string Tech of cell
obj.layer string Layer of cell

entity

Returns the name of entity.

const BemCell = require('@bem/sdk.cell');
const BemEntityName = require('@bem/sdk.entity-name');

const cell = new BemCell({
    entity: new BemEntityName({ block: 'button', elem: 'text' })
});

cell.entity; // ➜ BemEntityName { block: 'button', elem: 'text' }

tech

Returns the tech of cell.

const BemCell = require('@bem/sdk.cell');
const BemEntityName = require('@bem/sdk.entity-name');

const cell = new BemCell({
    entity: new BemEntityName({ block: 'button', elem: 'text' }),
    tech: 'css'
});

cell.tech; // ➜ css

layer

Returns the layer of this cell.

const BemCell = require('@bem/sdk.cell');
const BemEntityName = require('@bem/sdk.entity-name');

const cell = new BemCell({
   entity: new BemEntityName({ block: 'button', elem: 'text' }),
   layer: 'desktop'
});

cell.layer; // ➜ desktop

id

Returns the identifier of this cell.

Important: should only be used to determine uniqueness of cell.

const BemCell = require('@bem/sdk.cell');
const BemEntityName = require('@bem/sdk.entity-name');

const cell = new BemCell({
    entity: new BemEntityName({ block: 'button', elem: 'text' }),
    tech: 'css',
    layer: 'desktop'
});

cell.id; // ➜ "button__text@desktop.css"

toString()

Returns a string representing this cell.

const BemCell = require('@bem/sdk.cell');
const BemEntityName = require('@bem/sdk.entity-name');
const cell = new BemCell({
    entity: new BemEntityName({ block: 'button', mod: 'focused' }),
    tech: 'css',
    layer: 'desktop'
});

cell.toString(); // button_focused@desktop.css

valueOf()

Returns an object representing this cell.

const BemCell = require('@bem/sdk.cell');
const BemEntityName = require('@bem/sdk.entity-name');
const cell = new BemCell({
    entity: new BemEntityName({ block: 'button', mod: 'focused' }),
    tech: 'css',
    layer: 'desktop'
});

cell.valueOf();

// ➜ { entity: { block: 'button', mod: { name: 'focused', value: true } }, tech: 'css', layer: 'desktop' }

toJSON()

Returns an object for JSON.stringify() purpose.

isEqual(cell)

Determines whether specified cell is deep equal to cell or not.

Parameter Type Description
cell BemCell The cell to compare.
const BemCell = require('@bem/sdk.cell');
const buttonCell1 = BemCell.create({ block: 'button', tech: 'css', layer: 'desktop' });
const buttonCell2 = BemCell.create({ block: 'button', tech: 'css', layer: 'desktop' });
const inputCell = BemCell.create({ block: 'input', tech: 'css', layer: 'common' });

buttonCell1.isEqual(buttonCell2); // true
buttonCell1.isEqual(inputCell); // false

#isBemCell(cell)

Determines whether specified cell is instance of BemCell.

Parameter Type Description
cell BemCell The cell to check.
const BemCell = require('@bem/sdk.cell');
const BemEntityName = require('@bem/sdk.entity-name');

const cell = new BemCell({
    entity: new BemEntityName({ block: 'button', elem: 'text' })
});

BemCell.isBemCell(cell); // true
BemCell.isBemCell({}); // false

#create(object)

Creates BemCell instance by any object representation.

Helper for sugar-free simplicity.

Parameter Type Description
object object Representation of entity name.

Passed Object could have fields for BemEntityName and cell itself:

Object field Type Description
block string The block name of entity.
elem string The element name of entity.
mod string, object The modifier of entity.

If specified value is string then it will be equivalent to { name: string, val: true }.
val string The modifier value of entity. Used if mod is a string.
mod.name string The modifier name of entity.
mod.val * The modifier value of entity.
modName string The modifier name of entity. Used if mod.name wasn't specified.
modVal * The modifier value of entity. Used if neither mod.val nor val were not specified.
tech string Technology of cell.
layer string Layer of cell.
const BemCell = require('@bem/sdk.cell');

BemCell.create({ block: 'my-button', mod: 'theme', val: 'red', tech: 'css', layer: 'common' });
BemCell.create({ block: 'my-button', modName: 'theme', modVal: 'red', tech: 'css', layer: 'common' });
BemCell.create({ entity: { block: 'my-button', modName: 'theme', modVal: 'red' }, tech: 'css' }); // valueOf() format
// → BemCell { entity: { block: 'my-button', mod: { name: 'theme', val: 'red' } }, tech: 'css', layer: 'common' }

Debuggability

In Node.js, console.log() calls util.inspect() on each argument without a formatting placeholder.

BemCell has inspect() method to get custom string representation of the object.

const BemCell = require('@bem/sdk.cell');
const BemEntityName = require('@bem/sdk.entity-name');

const cell = new BemCell({
    entity: new BemEntityName({ block: 'input', mod: 'available' }),
    tech: 'css'
});

console.log(cell);

// ➜ BemCell { entity: { block: 'input', mod: { name: 'available' } }, tech: 'css' }

You can also convert BemCell object to a string.

const BemCell = require('@bem/sdk.cell');
const BemEntityName = require('@bem/sdk.entity-name');

const cell = new BemCell({
    entity: new BemEntityName({ block: 'input', mod: 'available' }),
    tech: 'css'
});

console.log(`cell: ${cell}`);

// ➜ cell: input_available.css

Also BemCell has toJSON method to support JSON.stringify() behaviour.

const BemCell = require('@bem/sdk.cell');
const BemEntityName = require('@bem/sdk.entity-name');

const cell = new BemCell({
    entity: new BemEntityName({ block: 'input', mod: 'available' }),
    tech: 'css'
});

console.log(JSON.stringify(cell));

// ➜ {"entity":{"block":"input","mod":{"name":"available","val":true}},"tech":"css"}

Deprecation

Deprecation is performed with depd To silencing deprecation warnings from being output simply use this. Details

NO_DEPRECATION=@bem/sdk.cell node app.js

License

Code and documentation © 2016 YANDEX LLC. Code released under the Mozilla Public License 2.0.