319 lines
8.0 KiB
JavaScript
319 lines
8.0 KiB
JavaScript
'use strict';
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/**
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* Module dependencies
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*/
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var toRegex = require('to-regex');
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var unique = require('array-unique');
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var extend = require('extend-shallow');
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/**
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* Local dependencies
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*/
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var compilers = require('./lib/compilers');
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var parsers = require('./lib/parsers');
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var Braces = require('./lib/braces');
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var utils = require('./lib/utils');
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var MAX_LENGTH = 1024 * 64;
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var cache = {};
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/**
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* Convert the given `braces` pattern into a regex-compatible string. By default, only one string is generated for every input string. Set `options.expand` to true to return an array of patterns (similar to Bash or minimatch. Before using `options.expand`, it's recommended that you read the [performance notes](#performance)).
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*
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* ```js
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* var braces = require('braces');
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* console.log(braces('{a,b,c}'));
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* //=> ['(a|b|c)']
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*
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* console.log(braces('{a,b,c}', {expand: true}));
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* //=> ['a', 'b', 'c']
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* ```
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* @param {String} `str`
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* @param {Object} `options`
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* @return {String}
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* @api public
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*/
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function braces(pattern, options) {
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var key = utils.createKey(String(pattern), options);
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var arr = [];
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var disabled = options && options.cache === false;
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if (!disabled && cache.hasOwnProperty(key)) {
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return cache[key];
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}
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if (Array.isArray(pattern)) {
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for (var i = 0; i < pattern.length; i++) {
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arr.push.apply(arr, braces.create(pattern[i], options));
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}
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} else {
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arr = braces.create(pattern, options);
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}
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if (options && options.nodupes === true) {
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arr = unique(arr);
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}
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if (!disabled) {
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cache[key] = arr;
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}
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return arr;
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}
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/**
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* Expands a brace pattern into an array. This method is called by the main [braces](#braces) function when `options.expand` is true. Before using this method it's recommended that you read the [performance notes](#performance)) and advantages of using [.optimize](#optimize) instead.
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*
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* ```js
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* var braces = require('braces');
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* console.log(braces.expand('a/{b,c}/d'));
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* //=> ['a/b/d', 'a/c/d'];
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* ```
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* @param {String} `pattern` Brace pattern
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* @param {Object} `options`
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* @return {Array} Returns an array of expanded values.
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* @api public
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*/
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braces.expand = function(pattern, options) {
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return braces.create(pattern, extend({}, options, {expand: true}));
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};
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/**
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* Expands a brace pattern into a regex-compatible, optimized string. This method is called by the main [braces](#braces) function by default.
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*
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* ```js
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* var braces = require('braces');
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* console.log(braces.expand('a/{b,c}/d'));
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* //=> ['a/(b|c)/d']
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* ```
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* @param {String} `pattern` Brace pattern
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* @param {Object} `options`
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* @return {Array} Returns an array of expanded values.
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* @api public
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*/
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braces.optimize = function(pattern, options) {
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return braces.create(pattern, options);
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};
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/**
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* Processes a brace pattern and returns either an expanded array (if `options.expand` is true), a highly optimized regex-compatible string. This method is called by the main [braces](#braces) function.
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*
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* ```js
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* var braces = require('braces');
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* console.log(braces.create('user-{200..300}/project-{a,b,c}-{1..10}'))
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* //=> 'user-(20[0-9]|2[1-9][0-9]|300)/project-(a|b|c)-([1-9]|10)'
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* ```
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* @param {String} `pattern` Brace pattern
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* @param {Object} `options`
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* @return {Array} Returns an array of expanded values.
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* @api public
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*/
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braces.create = function(pattern, options) {
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if (typeof pattern !== 'string') {
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throw new TypeError('expected a string');
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}
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var maxLength = (options && options.maxLength) || MAX_LENGTH;
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if (pattern.length >= maxLength) {
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throw new Error('expected pattern to be less than ' + maxLength + ' characters');
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}
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function create() {
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if (pattern === '' || pattern.length < 3) {
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return [pattern];
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}
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if (utils.isEmptySets(pattern)) {
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return [];
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}
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if (utils.isQuotedString(pattern)) {
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return [pattern.slice(1, -1)];
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}
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var proto = new Braces(options);
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var result = !options || options.expand !== true
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? proto.optimize(pattern, options)
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: proto.expand(pattern, options);
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// get the generated pattern(s)
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var arr = result.output;
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// filter out empty strings if specified
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if (options && options.noempty === true) {
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arr = arr.filter(Boolean);
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}
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// filter out duplicates if specified
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if (options && options.nodupes === true) {
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arr = unique(arr);
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}
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Object.defineProperty(arr, 'result', {
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enumerable: false,
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value: result
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});
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return arr;
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}
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return memoize('create', pattern, options, create);
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};
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/**
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* Create a regular expression from the given string `pattern`.
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*
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* ```js
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* var braces = require('braces');
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*
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* console.log(braces.makeRe('id-{200..300}'));
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* //=> /^(?:id-(20[0-9]|2[1-9][0-9]|300))$/
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* ```
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* @param {String} `pattern` The pattern to convert to regex.
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* @param {Object} `options`
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* @return {RegExp}
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* @api public
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*/
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braces.makeRe = function(pattern, options) {
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if (typeof pattern !== 'string') {
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throw new TypeError('expected a string');
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}
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var maxLength = (options && options.maxLength) || MAX_LENGTH;
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if (pattern.length >= maxLength) {
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throw new Error('expected pattern to be less than ' + maxLength + ' characters');
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}
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function makeRe() {
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var arr = braces(pattern, options);
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var opts = extend({strictErrors: false}, options);
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return toRegex(arr, opts);
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}
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return memoize('makeRe', pattern, options, makeRe);
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};
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/**
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* Parse the given `str` with the given `options`.
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*
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* ```js
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* var braces = require('braces');
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* var ast = braces.parse('a/{b,c}/d');
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* console.log(ast);
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* // { type: 'root',
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* // errors: [],
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* // input: 'a/{b,c}/d',
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* // nodes:
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* // [ { type: 'bos', val: '' },
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* // { type: 'text', val: 'a/' },
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* // { type: 'brace',
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* // nodes:
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* // [ { type: 'brace.open', val: '{' },
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* // { type: 'text', val: 'b,c' },
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* // { type: 'brace.close', val: '}' } ] },
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* // { type: 'text', val: '/d' },
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* // { type: 'eos', val: '' } ] }
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* ```
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* @param {String} `pattern` Brace pattern to parse
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* @param {Object} `options`
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* @return {Object} Returns an AST
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* @api public
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*/
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braces.parse = function(pattern, options) {
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var proto = new Braces(options);
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return proto.parse(pattern, options);
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};
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/**
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* Compile the given `ast` or string with the given `options`.
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*
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* ```js
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* var braces = require('braces');
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* var ast = braces.parse('a/{b,c}/d');
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* console.log(braces.compile(ast));
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* // { options: { source: 'string' },
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* // state: {},
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* // compilers:
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* // { eos: [Function],
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* // noop: [Function],
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* // bos: [Function],
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* // brace: [Function],
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* // 'brace.open': [Function],
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* // text: [Function],
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* // 'brace.close': [Function] },
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* // output: [ 'a/(b|c)/d' ],
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* // ast:
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* // { ... },
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* // parsingErrors: [] }
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* ```
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* @param {Object|String} `ast` AST from [.parse](#parse). If a string is passed it will be parsed first.
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* @param {Object} `options`
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* @return {Object} Returns an object that has an `output` property with the compiled string.
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* @api public
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*/
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braces.compile = function(ast, options) {
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var proto = new Braces(options);
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return proto.compile(ast, options);
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};
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/**
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* Clear the regex cache.
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*
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* ```js
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* braces.clearCache();
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* ```
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* @api public
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*/
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braces.clearCache = function() {
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cache = braces.cache = {};
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};
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/**
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* Memoize a generated regex or function. A unique key is generated
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* from the method name, pattern, and user-defined options. Set
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* options.memoize to false to disable.
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*/
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function memoize(type, pattern, options, fn) {
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var key = utils.createKey(type + ':' + pattern, options);
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var disabled = options && options.cache === false;
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if (disabled) {
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braces.clearCache();
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return fn(pattern, options);
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}
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if (cache.hasOwnProperty(key)) {
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return cache[key];
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}
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var res = fn(pattern, options);
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cache[key] = res;
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return res;
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}
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/**
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* Expose `Braces` constructor and methods
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* @type {Function}
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*/
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braces.Braces = Braces;
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braces.compilers = compilers;
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braces.parsers = parsers;
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braces.cache = cache;
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/**
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* Expose `braces`
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* @type {Function}
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*/
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module.exports = braces;
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