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/* https://github.com/alexei/sprintf.js/blob/master/src/sprintf.js */

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/* global window, exports, define */

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!function() {

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    'use strict'

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    var re = {

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        not_string: /[^s]/,

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        not_bool: /[^t]/,

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        not_type: /[^T]/,

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        not_primitive: /[^v]/,

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        number: /[diefg]/,

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        numeric_arg: /[bcdiefguxX]/,

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        json: /[j]/,

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        not_json: /[^j]/,

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        text: /^[^\x25]+/,

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        modulo: /^\x25{2}/,

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        placeholder: /^\x25(?:([1-9]\d*)\$|\(([^)]+)\))?(\+)?(0|'[^$])?(-)?(\d+)?(?:\.(\d+))?([b-gijostTuvxX])/,

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        key: /^([a-z_][a-z_\d]*)/i,

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        key_access: /^\.([a-z_][a-z_\d]*)/i,

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        index_access: /^\[(\d+)\]/,

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        sign: /^[+-]/

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    }

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    function sprintf(key) {

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        // arguments is not an array, but should be fine for this call

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        return sprintf_format(sprintf_parse(key), arguments)

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    }

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    function vsprintf(fmt, argv) {

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        return sprintf.apply(null, [fmt].concat(argv || []))

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    }

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    function sprintf_format(parse_tree, argv) {

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        var cursor = 1, tree_length = parse_tree.length, arg, output = '', i, k, ph, pad, pad_character, pad_length, is_positive, sign

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        for (i = 0; i < tree_length; i++) {

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            if (typeof parse_tree[i] === 'string') {

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                output += parse_tree[i]

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            }

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            else if (typeof parse_tree[i] === 'object') {

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                ph = parse_tree[i] // convenience purposes only

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                if (ph.keys) { // keyword argument

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                    arg = argv[cursor]

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                    for (k = 0; k < ph.keys.length; k++) {

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                        if (arg == undefined) {

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                            throw new Error(sprintf('[sprintf] Cannot access property "%s" of undefined value "%s"', ph.keys[k], ph.keys[k-1]))

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                        }

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                        arg = arg[ph.keys[k]]

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                    }

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                }

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                else if (ph.param_no) { // positional argument (explicit)

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                    arg = argv[ph.param_no]

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                }

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                else { // positional argument (implicit)

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                    arg = argv[cursor++]

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                }

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                if (re.not_type.test(ph.type) && re.not_primitive.test(ph.type) && arg instanceof Function) {

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                    arg = arg()

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                }

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                if (re.numeric_arg.test(ph.type) && (typeof arg !== 'number' && isNaN(arg))) {

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                    throw new TypeError(sprintf('[sprintf] expecting number but found %T', arg))

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                }

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                if (re.number.test(ph.type)) {

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                    is_positive = arg >= 0

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                }

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                switch (ph.type) {

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                    case 'b':

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                        arg = parseInt(arg, 10).toString(2)

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                        break

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                    case 'c':

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                        arg = String.fromCharCode(parseInt(arg, 10))

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                        break

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                    case 'd':

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                    case 'i':

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                        arg = parseInt(arg, 10)

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                        break

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                    case 'j':

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                        arg = JSON.stringify(arg, null, ph.width ? parseInt(ph.width) : 0)

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                        break

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                    case 'e':

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                        arg = ph.precision ? parseFloat(arg).toExponential(ph.precision) : parseFloat(arg).toExponential()

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                        break

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                    case 'f':

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                        arg = ph.precision ? parseFloat(arg).toFixed(ph.precision) : parseFloat(arg)

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                        break

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                    case 'g':

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                        arg = ph.precision ? String(Number(arg.toPrecision(ph.precision))) : parseFloat(arg)

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                        break

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                    case 'o':

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                        arg = (parseInt(arg, 10) >>> 0).toString(8)

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                        break

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                    case 's':

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                        arg = String(arg)

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                        arg = (ph.precision ? arg.substring(0, ph.precision) : arg)

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                        break

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                    case 't':

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                        arg = String(!!arg)

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                        arg = (ph.precision ? arg.substring(0, ph.precision) : arg)

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                        break

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                    case 'T':

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                        arg = Object.prototype.toString.call(arg).slice(8, -1).toLowerCase()

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                        arg = (ph.precision ? arg.substring(0, ph.precision) : arg)

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                        break

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                    case 'u':

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                        arg = parseInt(arg, 10) >>> 0

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                        break

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                    case 'v':

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                        arg = arg.valueOf()

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                        arg = (ph.precision ? arg.substring(0, ph.precision) : arg)

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                        break

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                    case 'x':

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                        arg = (parseInt(arg, 10) >>> 0).toString(16)

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                        break

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                    case 'X':

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                        arg = (parseInt(arg, 10) >>> 0).toString(16).toUpperCase()

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                        break

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                }

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                if (re.json.test(ph.type)) {

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                    output += arg

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                }

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                else {

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                    if (re.number.test(ph.type) && (!is_positive || ph.sign)) {

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                        sign = is_positive ? '+' : '-'

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                        arg = arg.toString().replace(re.sign, '')

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                    }

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                    else {

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                        sign = ''

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                    }

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                    pad_character = ph.pad_char ? ph.pad_char === '0' ? '0' : ph.pad_char.charAt(1) : ' '

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                    pad_length = ph.width - (sign + arg).length

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                    pad = ph.width ? (pad_length > 0 ? pad_character.repeat(pad_length) : '') : ''

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                    output += ph.align ? sign + arg + pad : (pad_character === '0' ? sign + pad + arg : pad + sign + arg)

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                }

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            }

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        }

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        return output

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    }

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    var sprintf_cache = Object.create(null)

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    function sprintf_parse(fmt) {

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        if (sprintf_cache[fmt]) {

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            return sprintf_cache[fmt]

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        }

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        var _fmt = fmt, match, parse_tree = [], arg_names = 0

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        while (_fmt) {

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            if ((match = re.text.exec(_fmt)) !== null) {

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                parse_tree.push(match[0])

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            }

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            else if ((match = re.modulo.exec(_fmt)) !== null) {

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                parse_tree.push('%')

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            }

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            else if ((match = re.placeholder.exec(_fmt)) !== null) {

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                if (match[2]) {

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                    arg_names |= 1

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                    var field_list = [], replacement_field = match[2], field_match = []

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                    if ((field_match = re.key.exec(replacement_field)) !== null) {

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                        field_list.push(field_match[1])

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                        while ((replacement_field = replacement_field.substring(field_match[0].length)) !== '') {

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                            if ((field_match = re.key_access.exec(replacement_field)) !== null) {

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                                field_list.push(field_match[1])

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                            }

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                            else if ((field_match = re.index_access.exec(replacement_field)) !== null) {

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                                field_list.push(field_match[1])

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                            }

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                            else {

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                                throw new SyntaxError('[sprintf] failed to parse named argument key')

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                            }

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                        }

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                    }

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                    else {

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                        throw new SyntaxError('[sprintf] failed to parse named argument key')

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                    }

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                    match[2] = field_list

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                }

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                else {

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                    arg_names |= 2

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                }

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                if (arg_names === 3) {

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                    throw new Error('[sprintf] mixing positional and named placeholders is not (yet) supported')

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                }

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                parse_tree.push(

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                    {

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                        placeholder: match[0],

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                        param_no:    match[1],

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                        keys:        match[2],

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                        sign:        match[3],

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                        pad_char:    match[4],

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                        align:       match[5],

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                        width:       match[6],

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                        precision:   match[7],

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                        type:        match[8]

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                    }

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                )

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            }

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            else {

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                throw new SyntaxError('[sprintf] unexpected placeholder')

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            }

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            _fmt = _fmt.substring(match[0].length)

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        }

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        return sprintf_cache[fmt] = parse_tree

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    }

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    /**

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     * export to either browser or node.js

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     */

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    /* eslint-disable quote-props */

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    if (typeof exports !== 'undefined') {

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        exports['sprintf'] = sprintf

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        exports['vsprintf'] = vsprintf

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    }

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    if (typeof window !== 'undefined') {

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        window['sprintf'] = sprintf

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        window['vsprintf'] = vsprintf

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        if (typeof define === 'function' && define['amd']) {

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            define(function() {

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                return {

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                    'sprintf': sprintf,

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                    'vsprintf': vsprintf

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                }

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            })

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        }

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    }

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    /* eslint-enable quote-props */

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}(); // eslint-disable-line