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Dir : ~/usr/share/nodejs/glob-to-regexp/
View File Name : index.js

module.exports = function (glob, opts) {
  if (typeof glob !== 'string') {
    throw new TypeError('Expected a string');
  }

  var str = String(glob);

  // The regexp we are building, as a string.
  var reStr = "";

  // Whether we are matching so called "extended" globs (like bash) and should
  // support single character matching, matching ranges of characters, group
  // matching, etc.
  var extended = opts ? !!opts.extended : false;

  // When globstar is _false_ (default), '/foo/*' is translated a regexp like
  // '^\/foo\/.*$' which will match any string beginning with '/foo/'
  // When globstar is _true_, '/foo/*' is translated to regexp like
  // '^\/foo\/[^/]*$' which will match any string beginning with '/foo/' BUT
  // which does not have a '/' to the right of it.
  // E.g. with '/foo/*' these will match: '/foo/bar', '/foo/bar.txt' but
  // these will not '/foo/bar/baz', '/foo/bar/baz.txt'
  // Lastely, when globstar is _true_, '/foo/**' is equivelant to '/foo/*' when
  // globstar is _false_
  var globstar = opts ? !!opts.globstar : false;

  // If we are doing extended matching, this boolean is true when we are inside
  // a group (eg {*.html,*.js}), and false otherwise.
  var inGroup = false;

  // RegExp flags (eg "i" ) to pass in to RegExp constructor.
  var flags = opts && typeof( opts.flags ) === "string" ? opts.flags : "";

  var c;
  for (var i = 0, len = str.length; i < len; i++) {
    c = str[i];

    switch (c) {
    case "/":
    case "$":
    case "^":
    case "+":
    case ".":
    case "(":
    case ")":
    case "=":
    case "!":
    case "|":
      reStr += "\\" + c;
      break;

    case "?":
      if (extended) {
        reStr += ".";
	    break;
      }

    case "[":
    case "]":
      if (extended) {
        reStr += c;
	    break;
      }

    case "{":
      if (extended) {
        inGroup = true;
	    reStr += "(";
	    break;
      }

    case "}":
      if (extended) {
        inGroup = false;
	    reStr += ")";
	    break;
      }

    case ",":
      if (inGroup) {
        reStr += "|";
	    break;
      }
      reStr += "\\" + c;
      break;

    case "*":
      // Move over all consecutive "*"'s.
      // Also store the previous and next characters
      var prevChar = str[i - 1];
      var starCount = 1;
      while(str[i + 1] === "*") {
        starCount++;
        i++;
      }
      var nextChar = str[i + 1];

      if (!globstar) {
        // globstar is disabled, so treat any number of "*" as one
        reStr += ".*";
      } else {
        // globstar is enabled, so determine if this is a globstar segment
        var isGlobstar = starCount > 1                      // multiple "*"'s
          && (prevChar === "/" || prevChar === undefined)   // from the start of the segment
          && (nextChar === "/" || nextChar === undefined)   // to the end of the segment

        if (isGlobstar) {
          // it's a globstar, so match zero or more path segments
          reStr += "((?:[^/]*(?:\/|$))*)";
          i++; // move over the "/"
        } else {
          // it's not a globstar, so only match one path segment
          reStr += "([^/]*)";
        }
      }
      break;

    default:
      reStr += c;
    }
  }

  // When regexp 'g' flag is specified don't
  // constrain the regular expression with ^ & $
  if (!flags || !~flags.indexOf('g')) {
    reStr = "^" + reStr + "$";
  }

  return new RegExp(reStr, flags);
};