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/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
"use strict";

function globToRegExp(glob) {
	// * [^\\\/]*
	// /**/ /.+/
	// ^* \./.+ (concord special)
	// ? [^\\\/]
	// [!...] [^...]
	// [^...] [^...]
	// / [\\\/]
	// {...,...} (...|...)
	// ?(...|...) (...|...)?
	// +(...|...) (...|...)+
	// *(...|...) (...|...)*
	// @(...|...) (...|...)
	if (/^\(.+\)$/.test(glob)) {
		// allow to pass an RegExp in brackets
		return new RegExp(glob.substr(1, glob.length - 2));
	}
	const tokens = tokenize(glob);
	const process = createRoot();
	const regExpStr = tokens.map(process).join("");
	return new RegExp("^" + regExpStr + "$");
}

const SIMPLE_TOKENS = {
	"@(": "one",
	"?(": "zero-one",
	"+(": "one-many",
	"*(": "zero-many",
	"|": "segment-sep",
	"/**/": "any-path-segments",
	"**": "any-path",
	"*": "any-path-segment",
	"?": "any-char",
	"{": "or",
	"/": "path-sep",
	",": "comma",
	")": "closing-segment",
	"}": "closing-or"
};

function tokenize(glob) {
	return glob
		.split(
			/([@?+*]\(|\/\*\*\/|\*\*|[?*]|\[[!^]?(?:[^\]\\]|\\.)+\]|\{|,|\/|[|)}])/g
		)
		.map(item => {
			if (!item) return null;
			const t = SIMPLE_TOKENS[item];
			if (t) {
				return {
					type: t
				};
			}
			if (item[0] === "[") {
				if (item[1] === "^" || item[1] === "!") {
					return {
						type: "inverted-char-set",
						value: item.substr(2, item.length - 3)
					};
				} else {
					return {
						type: "char-set",
						value: item.substr(1, item.length - 2)
					};
				}
			}
			return {
				type: "string",
				value: item
			};
		})
		.filter(Boolean)
		.concat({
			type: "end"
		});
}

function createRoot() {
	const inOr = [];
	const process = createSeqment();
	let initial = true;
	return function(token) {
		switch (token.type) {
			case "or":
				inOr.push(initial);
				return "(";
			case "comma":
				if (inOr.length) {
					initial = inOr[inOr.length - 1];
					return "|";
				} else {
					return process(
						{
							type: "string",
							value: ","
						},
						initial
					);
				}
			case "closing-or":
				if (inOr.length === 0) throw new Error("Unmatched '}'");
				inOr.pop();
				return ")";
			case "end":
				if (inOr.length) throw new Error("Unmatched '{'");
				return process(token, initial);
			default: {
				const result = process(token, initial);
				initial = false;
				return result;
			}
		}
	};
}

function createSeqment() {
	const inSeqment = [];
	const process = createSimple();
	return function(token, initial) {
		switch (token.type) {
			case "one":
			case "one-many":
			case "zero-many":
			case "zero-one":
				inSeqment.push(token.type);
				return "(";
			case "segment-sep":
				if (inSeqment.length) {
					return "|";
				} else {
					return process(
						{
							type: "string",
							value: "|"
						},
						initial
					);
				}
			case "closing-segment": {
				const segment = inSeqment.pop();
				switch (segment) {
					case "one":
						return ")";
					case "one-many":
						return ")+";
					case "zero-many":
						return ")*";
					case "zero-one":
						return ")?";
				}
				throw new Error("Unexcepted segment " + segment);
			}
			case "end":
				if (inSeqment.length > 0) {
					throw new Error("Unmatched segment, missing ')'");
				}
				return process(token, initial);
			default:
				return process(token, initial);
		}
	};
}

function createSimple() {
	return function(token, initial) {
		switch (token.type) {
			case "path-sep":
				return "[\\\\/]+";
			case "any-path-segments":
				return "[\\\\/]+(?:(.+)[\\\\/]+)?";
			case "any-path":
				return "(.*)";
			case "any-path-segment":
				if (initial) {
					return "\\.[\\\\/]+(?:.*[\\\\/]+)?([^\\\\/]+)";
				} else {
					return "([^\\\\/]*)";
				}
			case "any-char":
				return "[^\\\\/]";
			case "inverted-char-set":
				return "[^" + token.value + "]";
			case "char-set":
				return "[" + token.value + "]";
			case "string":
				return token.value.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
			case "end":
				return "";
			default:
				throw new Error("Unsupported token '" + token.type + "'");
		}
	};
}

exports.globToRegExp = globToRegExp;