// Copyright 2014 Simon Lydell

void (function(root, factory) {
  if (typeof define === "function" && define.amd) {
    define(factory)
  } else if (typeof exports === "object") {
    module.exports = factory()
  } else {
    root.sourceMappingURL = factory()
  }
}(this, function(undefined) {

  var innerRegex = /[#@] sourceMappingURL=([^\s'"]*)/
  var newlineRegex = /\r\n?|\n/

  var regex = RegExp(
    "(^|(?:" + newlineRegex.source + "))" +
    "(?:" +
      "/\\*" +
      "(?:\\s*(?:" + newlineRegex.source + ")(?://)?)?" +
      "(?:" + innerRegex.source + ")" +
      "\\s*" +
      "\\*/" +
      "|" +
      "//(?:" + innerRegex.source + ")" +
    ")" +
    "\\s*$"
  )

  function SourceMappingURL(commentSyntax) {
    this._commentSyntax = commentSyntax
  }

  SourceMappingURL.prototype.regex = regex
  SourceMappingURL.prototype._innerRegex = innerRegex
  SourceMappingURL.prototype._newlineRegex = newlineRegex

  SourceMappingURL.prototype.get = function(code) {
    var match = code.match(this.regex)
    if (!match) {
      return null
    }
    return match[2] || match[3] || ""
  }

  SourceMappingURL.prototype.set = function(code, url, commentSyntax) {
    if (!commentSyntax) {
      commentSyntax = this._commentSyntax
    }
    // Use a newline present in the code, or fall back to '\n'.
    var newline = String(code.match(this._newlineRegex) || "\n")
    var open = commentSyntax[0], close = commentSyntax[1] || ""
    code = this.remove(code)
    return code + newline + open + "# sourceMappingURL=" + url + close
  }

  SourceMappingURL.prototype.remove = function(code) {
    return code.replace(this.regex, "")
  }

  SourceMappingURL.prototype.insertBefore = function(code, string) {
    var match = code.match(this.regex)
    if (match) {
      var hasNewline = Boolean(match[1])
      return code.slice(0, match.index) +
        string +
        (hasNewline ? "" : "\n") +
        code.slice(match.index)
    } else {
      return code + string
    }
  }

  SourceMappingURL.prototype.SourceMappingURL = SourceMappingURL

  return new SourceMappingURL(["/*", " */"])

}));