SimenB/stylint

'use strict'

var ignoreRe = /\(.*\)|@extend|\(|if|for(?!\w)|else|return|@block|@media|@import|@require|,$/
var stripRe = /(?=\S)\[\S+\]|(\.|#)\w+/
var equalsRe = /( =|\?=|\+=|-=)+/
var validJSON = require( '../data/valid.json' )


/**
 * @description check for brackets
 * @param {string} [line] curr line being linted
 * @returns {boolean} true if bracket found, false if not
 */
var brackets = function( line ) {
    // in order if:
    // 1 in hash or css block
    // 2 variable or hash or block
    // 3 mixin
    // 4 .selector,
    if ( this.state.hashOrCSS ||
        line.trim().length === 0 ||
        equalsRe.test( line ) ||
        ignoreRe.test( line ) ) {
        return
    }

    var arr = ['hint']
    var isCSS = false
    var isMixin = false
    var bracket = false

    if ( this.state.conf === 'never' ) {
        // ex: $hash = { is ok but .class = { is not
        if ( line.indexOf( '{' ) !== -1 &&
            line.indexOf( '=' ) === -1 &&
            line.indexOf( '}' ) === -1 ) {
            bracket = true
        }
        // ex: } is okay if ending a hash. otherwise it is NOT okay
        // one liners are lame but ok ( check for = { )
        else if ( line.indexOf( '}' ) !== -1 && line.indexOf( '{' ) === -1 ) {
            bracket = true
        }
    }
    else if ( this.state.conf === 'always' ) {

        if ( bracket === false ) {
            arr = this.splitAndStrip( new RegExp( /[\s\t,:]/ ), line )

            if ( typeof arr[0] !== 'undefined' ) {
                arr[0] = arr[0].replace( stripRe, '' ).trim()

                isCSS = validJSON.css.some( function( css ) {
                    return arr[0] === css || this.checkPrefix( arr[0], css, validJSON )
                }.bind( this ) )

                isMixin = this.cache.customProperties.some( function( mixin ) {
                    return arr[0] === mixin
                } )
            }

            // basically, we don't care about properties like margin or padding
            if ( line.trim().indexOf( '}' ) !== -1 || isCSS || isMixin ) { return }

            if ( line.indexOf( '{' ) !== -1 ) {
                bracket = true
                this.state.openBracket = true
            }
            // ex: } is okay if ending a hash. otherwise it is NOT okay
            else if ( line.indexOf( '}' ) !== -1 && this.state.openBracket ) {
                bracket = true
                this.state.openBracket = false
            }
        }
    }

    if ( this.state.conf === 'never' && bracket === true ) {
        this.msg( 'unnecessary bracket', line.indexOf( '{' ) )
    }
    else if ( this.state.conf === 'always' && bracket === false ) {
        this.msg( 'always use brackets when defining selectors', line.length )
    }

    return bracket
}

module.exports = brackets