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'use strict';

const stringify = require('./lib/stringify');

const compile = require('./lib/compile');

const expand = require('./lib/expand');

const parse = require('./lib/parse');

/**

* Expand the given pattern or create a regex-compatible string.

*

* ```js

* const braces = require('braces');

* console.log(braces('{a,b,c}', { compile: true })); //=> ['(a|b|c)']

* console.log(braces('{a,b,c}')); //=> ['a', 'b', 'c']

* ```

* @param {String} `str`

* @param {Object} `options`

* @return {String}

* @api public

*/

const braces = (input, options = {}) => {

let output = [];

if (Array.isArray(input)) {

for (let pattern of input) {

let result = braces.create(pattern, options);

if (Array.isArray(result)) {

output.push(...result);

} else {

output.push(result);

}

}

} else {

output = [].concat(braces.create(input, options));

}

if (options && options.expand === true && options.nodupes === true) {

output = [...new Set(output)];

}

return output;

};

/**

* Parse the given `str` with the given `options`.

*

* ```js

* // braces.parse(pattern, [, options]);

* const ast = braces.parse('a/{b,c}/d');

* console.log(ast);

* ```

* @param {String} pattern Brace pattern to parse

* @param {Object} options

* @return {Object} Returns an AST

* @api public

*/

braces.parse = (input, options = {}) => parse(input, options);

/**

* Creates a braces string from an AST, or an AST node.

*

* ```js

* const braces = require('braces');

* let ast = braces.parse('foo/{a,b}/bar');

* console.log(stringify(ast.nodes[2])); //=> '{a,b}'

* ```

* @param {String} `input` Brace pattern or AST.

* @param {Object} `options`

* @return {Array} Returns an array of expanded values.

* @api public

*/

braces.stringify = (input, options = {}) => {

if (typeof input === 'string') {

return stringify(braces.parse(input, options), options);

}

return stringify(input, options);

};

/**

* Compiles a brace pattern into a regex-compatible, optimized string.

* This method is called by the main [braces](#braces) function by default.

*

* ```js

* const braces = require('braces');

* console.log(braces.compile('a/{b,c}/d'));

* //=> ['a/(b|c)/d']

* ```

* @param {String} `input` Brace pattern or AST.

* @param {Object} `options`

* @return {Array} Returns an array of expanded values.

* @api public

*/

braces.compile = (input, options = {}) => {

if (typeof input === 'string') {

input = braces.parse(input, options);

}

return compile(input, options);

};

/**

* 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 [.compile](#compile) instead.

*

* ```js

* const braces = require('braces');

* console.log(braces.expand('a/{b,c}/d'));

* //=> ['a/b/d', 'a/c/d'];

* ```

* @param {String} `pattern` Brace pattern

* @param {Object} `options`

* @return {Array} Returns an array of expanded values.

* @api public

*/

braces.expand = (input, options = {}) => {

if (typeof input === 'string') {

input = braces.parse(input, options);

}

let result = expand(input, options);

// filter out empty strings if specified

if (options.noempty === true) {

result = result.filter(Boolean);

}

// filter out duplicates if specified

if (options.nodupes === true) {

result = [...new Set(result)];

}

return result;

};

/**

* 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.

*

* ```js

* const braces = require('braces');

* console.log(braces.create('user-{200..300}/project-{a,b,c}-{1..10}'))

* //=> 'user-(20[0-9]|2[1-9][0-9]|300)/project-(a|b|c)-([1-9]|10)'

* ```

* @param {String} `pattern` Brace pattern

* @param {Object} `options`

* @return {Array} Returns an array of expanded values.

* @api public

*/

braces.create = (input, options = {}) => {

if (input === '' || input.length < 3) {

return [input];

}

return options.expand !== true

? braces.compile(input, options)

: braces.expand(input, options);

};

/**

* Expose "braces"

*/

module.exports = braces;