'use strict';
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var splitString = require('split-string');
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var utils = module.exports;
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/**
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* Module dependencies
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*/
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utils.extend = require('extend-shallow');
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utils.flatten = require('arr-flatten');
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utils.isObject = require('isobject');
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utils.fillRange = require('fill-range');
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utils.repeat = require('repeat-element');
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utils.unique = require('array-unique');
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utils.define = function(obj, key, val) {
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Object.defineProperty(obj, key, {
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writable: true,
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configurable: true,
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enumerable: false,
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value: val
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});
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};
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/**
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* Returns true if the given string contains only empty brace sets.
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*/
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utils.isEmptySets = function(str) {
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return /^(?:\{,\})+$/.test(str);
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};
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/**
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* Returns true if the given string contains only empty brace sets.
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*/
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utils.isQuotedString = function(str) {
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var open = str.charAt(0);
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if (open === '\'' || open === '"' || open === '`') {
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return str.slice(-1) === open;
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}
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return false;
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};
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/**
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* Create the key to use for memoization. The unique key is generated
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* by iterating over the options and concatenating key-value pairs
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* to the pattern string.
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*/
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utils.createKey = function(pattern, options) {
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var id = pattern;
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if (typeof options === 'undefined') {
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return id;
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}
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var keys = Object.keys(options);
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for (var i = 0; i < keys.length; i++) {
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var key = keys[i];
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id += ';' + key + '=' + String(options[key]);
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}
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return id;
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};
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/**
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* Normalize options
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*/
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utils.createOptions = function(options) {
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var opts = utils.extend.apply(null, arguments);
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if (typeof opts.expand === 'boolean') {
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opts.optimize = !opts.expand;
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}
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if (typeof opts.optimize === 'boolean') {
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opts.expand = !opts.optimize;
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}
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if (opts.optimize === true) {
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opts.makeRe = true;
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}
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return opts;
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};
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/**
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* Join patterns in `a` to patterns in `b`
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*/
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utils.join = function(a, b, options) {
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options = options || {};
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a = utils.arrayify(a);
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b = utils.arrayify(b);
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if (!a.length) return b;
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if (!b.length) return a;
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var len = a.length;
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var idx = -1;
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var arr = [];
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while (++idx < len) {
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var val = a[idx];
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if (Array.isArray(val)) {
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for (var i = 0; i < val.length; i++) {
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val[i] = utils.join(val[i], b, options);
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}
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arr.push(val);
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continue;
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}
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for (var j = 0; j < b.length; j++) {
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var bval = b[j];
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if (Array.isArray(bval)) {
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arr.push(utils.join(val, bval, options));
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} else {
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arr.push(val + bval);
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}
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}
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}
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return arr;
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};
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/**
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* Split the given string on `,` if not escaped.
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*/
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utils.split = function(str, options) {
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var opts = utils.extend({sep: ','}, options);
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if (typeof opts.keepQuotes !== 'boolean') {
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opts.keepQuotes = true;
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}
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if (opts.unescape === false) {
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opts.keepEscaping = true;
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}
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return splitString(str, opts, utils.escapeBrackets(opts));
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};
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/**
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* Expand ranges or sets in the given `pattern`.
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*
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* @param {String} `str`
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* @param {Object} `options`
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* @return {Object}
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*/
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utils.expand = function(str, options) {
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var opts = utils.extend({rangeLimit: 10000}, options);
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var segs = utils.split(str, opts);
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var tok = { segs: segs };
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if (utils.isQuotedString(str)) {
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return tok;
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}
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if (opts.rangeLimit === true) {
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opts.rangeLimit = 10000;
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}
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if (segs.length > 1) {
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if (opts.optimize === false) {
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tok.val = segs[0];
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return tok;
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}
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tok.segs = utils.stringifyArray(tok.segs);
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} else if (segs.length === 1) {
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var arr = str.split('..');
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if (arr.length === 1) {
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tok.val = tok.segs[tok.segs.length - 1] || tok.val || str;
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tok.segs = [];
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return tok;
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}
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if (arr.length === 2 && arr[0] === arr[1]) {
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tok.escaped = true;
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tok.val = arr[0];
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tok.segs = [];
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return tok;
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}
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if (arr.length > 1) {
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if (opts.optimize !== false) {
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opts.optimize = true;
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delete opts.expand;
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}
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if (opts.optimize !== true) {
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var min = Math.min(arr[0], arr[1]);
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var max = Math.max(arr[0], arr[1]);
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var step = arr[2] || 1;
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if (opts.rangeLimit !== false && ((max - min) / step >= opts.rangeLimit)) {
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throw new RangeError('expanded array length exceeds range limit. Use options.rangeLimit to increase or disable the limit.');
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}
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}
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arr.push(opts);
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tok.segs = utils.fillRange.apply(null, arr);
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if (!tok.segs.length) {
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tok.escaped = true;
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tok.val = str;
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return tok;
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}
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if (opts.optimize === true) {
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tok.segs = utils.stringifyArray(tok.segs);
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}
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if (tok.segs === '') {
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tok.val = str;
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} else {
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tok.val = tok.segs[0];
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}
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return tok;
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}
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} else {
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tok.val = str;
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}
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return tok;
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};
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/**
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* Ensure commas inside brackets and parens are not split.
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* @param {Object} `tok` Token from the `split-string` module
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* @return {undefined}
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*/
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utils.escapeBrackets = function(options) {
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return function(tok) {
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if (tok.escaped && tok.val === 'b') {
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tok.val = '\\b';
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return;
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}
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if (tok.val !== '(' && tok.val !== '[') return;
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var opts = utils.extend({}, options);
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var brackets = [];
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var parens = [];
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var stack = [];
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var val = tok.val;
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var str = tok.str;
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var i = tok.idx - 1;
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while (++i < str.length) {
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var ch = str[i];
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if (ch === '\\') {
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val += (opts.keepEscaping === false ? '' : ch) + str[++i];
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continue;
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}
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if (ch === '(') {
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parens.push(ch);
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stack.push(ch);
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}
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if (ch === '[') {
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brackets.push(ch);
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stack.push(ch);
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}
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if (ch === ')') {
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parens.pop();
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stack.pop();
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if (!stack.length) {
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val += ch;
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break;
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}
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}
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if (ch === ']') {
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brackets.pop();
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stack.pop();
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if (!stack.length) {
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val += ch;
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break;
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}
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}
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val += ch;
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}
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tok.split = false;
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tok.val = val.slice(1);
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tok.idx = i;
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};
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};
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/**
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* Returns true if the given string looks like a regex quantifier
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* @return {Boolean}
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*/
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utils.isQuantifier = function(str) {
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return /^(?:[0-9]?,[0-9]|[0-9],)$/.test(str);
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};
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/**
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* Cast `val` to an array.
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* @param {*} `val`
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*/
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utils.stringifyArray = function(arr) {
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return [utils.arrayify(arr).join('|')];
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};
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/**
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* Cast `val` to an array.
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* @param {*} `val`
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*/
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utils.arrayify = function(arr) {
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if (typeof arr === 'undefined') {
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return [];
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}
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if (typeof arr === 'string') {
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return [arr];
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}
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return arr;
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};
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/**
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* Returns true if the given `str` is a non-empty string
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* @return {Boolean}
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*/
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utils.isString = function(str) {
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return str != null && typeof str === 'string';
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};
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/**
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* Get the last element from `array`
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* @param {Array} `array`
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* @return {*}
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*/
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utils.last = function(arr, n) {
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return arr[arr.length - (n || 1)];
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};
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utils.escapeRegex = function(str) {
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return str.replace(/\\?([!^*?()[\]{}+?/])/g, '\\$1');
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};
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