module.exports = function (glob, opts) {
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if (typeof glob !== 'string') {
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throw new TypeError('Expected a string');
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}
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var str = String(glob);
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// The regexp we are building, as a string.
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var reStr = "";
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// Whether we are matching so called "extended" globs (like bash) and should
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// support single character matching, matching ranges of characters, group
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// matching, etc.
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var extended = opts ? !!opts.extended : false;
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// When globstar is _false_ (default), '/foo/*' is translated a regexp like
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// '^\/foo\/.*$' which will match any string beginning with '/foo/'
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// When globstar is _true_, '/foo/*' is translated to regexp like
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// '^\/foo\/[^/]*$' which will match any string beginning with '/foo/' BUT
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// which does not have a '/' to the right of it.
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// E.g. with '/foo/*' these will match: '/foo/bar', '/foo/bar.txt' but
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// these will not '/foo/bar/baz', '/foo/bar/baz.txt'
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// Lastely, when globstar is _true_, '/foo/**' is equivelant to '/foo/*' when
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// globstar is _false_
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var globstar = opts ? !!opts.globstar : false;
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// If we are doing extended matching, this boolean is true when we are inside
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// a group (eg {*.html,*.js}), and false otherwise.
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var inGroup = false;
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// RegExp flags (eg "i" ) to pass in to RegExp constructor.
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var flags = opts && typeof( opts.flags ) === "string" ? opts.flags : "";
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var c;
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for (var i = 0, len = str.length; i < len; i++) {
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c = str[i];
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switch (c) {
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case "\\":
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case "/":
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case "$":
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case "^":
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case "+":
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case ".":
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case "(":
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case ")":
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case "=":
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case "!":
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case "|":
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reStr += "\\" + c;
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break;
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case "?":
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if (extended) {
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reStr += ".";
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break;
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}
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case "[":
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case "]":
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if (extended) {
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reStr += c;
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break;
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}
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case "{":
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if (extended) {
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inGroup = true;
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reStr += "(";
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break;
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}
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case "}":
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if (extended) {
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inGroup = false;
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reStr += ")";
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break;
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}
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case ",":
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if (inGroup) {
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reStr += "|";
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break;
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}
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reStr += "\\" + c;
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break;
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case "*":
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// Move over all consecutive "*"'s.
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// Also store the previous and next characters
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var prevChar = str[i - 1];
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var starCount = 1;
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while(str[i + 1] === "*") {
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starCount++;
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i++;
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}
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var nextChar = str[i + 1];
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if (!globstar) {
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// globstar is disabled, so treat any number of "*" as one
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reStr += ".*";
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} else {
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// globstar is enabled, so determine if this is a globstar segment
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var isGlobstar = starCount > 1 // multiple "*"'s
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&& (prevChar === "/" || prevChar === undefined) // from the start of the segment
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&& (nextChar === "/" || nextChar === undefined) // to the end of the segment
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if (isGlobstar) {
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// it's a globstar, so match zero or more path segments
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reStr += "(?:[^/]*(?:\/|$))*";
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i++; // move over the "/"
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} else {
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// it's not a globstar, so only match one path segment
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reStr += "[^/]*";
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}
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}
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break;
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default:
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reStr += c;
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}
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}
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// When regexp 'g' flag is specified don't
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// constrain the regular expression with ^ & $
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if (!flags || !~flags.indexOf('g')) {
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reStr = "^" + reStr + "$";
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}
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return new RegExp(reStr, flags);
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};
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