SimenB/stylint

'use strict'

// was a tab used, at all
var tabs = /\t/
// check for 2 or more spaces (if hard tabs, shouldn't find anything)
var spaces = /( {2,})+/
// don't throw false positives if line ends in comment
var trimRightRe = /( |\t)+(\/\/)+.+$/gm


/**
 * @description check for mixed spaces and tabs
 * @param {string} [line] curr line being linted
 * @param {string} [origLine] curr line before being stripped
 * @returns {boolean} true if mixed, false if not
 */
var mixed = function( line, origLine ) {
    var trimRight = origLine.replace( trimRightRe, '' )
    var isMixed = false
    var indentPref = this.config.indentPref.expect || this.config.indentPref
    var isNum = typeof indentPref === 'number'

    // regexp obj or null
    var hasTabs = tabs.exec( trimRight )
    var hasSpaces = spaces.exec( trimRight )

    // if this isnt set to false then we're indenting with spaces,
    // so check against tabs
    if ( isNum ) {
        if ( hasTabs ) {
            isMixed = true
        }
    }
    // else you're a hard tab believer (go you)
    // look for 2 or more spaces
    else if ( hasSpaces ) {
        isMixed = true
    }

    if ( isMixed === true ) {
        var index = isNum ? hasTabs.index : hasSpaces.index
        this.msg( 'mixed spaces and tabs', index )
    }

    return isMixed
}

module.exports = mixed