stylint/src/checks/efficient.js

A linter for stylus

'use strict'

var valueRe = /(margin|padding)+[:| ]/


/**
 * @description check for 0 0 0 0 or 50px 0 50px 0 type mistakes
 * @param {string} [line] curr line being linted
 * @returns {boolean} true if efficient, false if not
 */
var efficient = function( line ) {
	// line doesnt have margin or padding then there's nothin to do here
	if ( !valueRe.test( line ) ) { return }

	var isEfficient = true
	var arr = this.splitAndStrip( new RegExp( /[\s\t]/ ), line )

	// if margin or padding we run the tests
	// if line is potentially inefficient it needs to be at least this long
	if ( arr.length > 2 ) {
		// ex: margin 0 5px
		if ( arr.length === 3 ) {
			// ex margin 0 0
			if ( arr[1] === arr[2] ) {
				isEfficient = false
			}
		}
		// ex margin 0 5px 10px
		else if ( arr.length === 4 && arr[1] === arr[3] ) {
			// ex margin 0 5px 0
			isEfficient = false
		}
		// ex margin 0 50px 10px 7px
		else if ( arr.length === 5 ) {
			// ex margin 0 5px 0 5px or
			if ( arr[1] === arr[3] && arr[2] === arr[4] ||
				arr[1] !== arr[3] && arr[2] === arr[4] ) {
				isEfficient = false
			}
		}
	}

	var index = line.indexOf( arr[1] )

	if ( this.state.conf === 'never' && isEfficient === true ) {
		this.msg( 'the value on this line is too succinct', index )
	}
	else if ( this.state.conf === 'always' && isEfficient === false ) {
		this.msg( 'the value on this line could be more succinct', index )
	}

	return isEfficient
}

module.exports = efficient