#!/usr/bin/nodejs

// Parsing the variable

var unquote = function(x) {
  if (x.search(/%[^#+.]|%$/) >= 0)
    throw new Error("invalid value: bad escape: " + x);
  return x.replace(/%\./g, ':').replace(/%\+/g, '=').replace(/%#/g, '%');
};

var parse_prefix_map = function(x) {
  return (x || "").split(/:/g).filter(Boolean).map(function(part) {
    var tuples = part.split(/=/g).map(unquote);
    if (tuples.length !== 2)
      throw new Error("invalid value: not a pair: " + tuples);
    return tuples;
  });
};

// Applying the variable

var map_prefix = function(string, pm) {
  for (var i = pm.length - 1; i >= 0; --i) {;
    var dst = pm[i][0];
    var src = pm[i][1];
    if (string.indexOf(src) === 0) {
      return dst + string.substr(src.length);
    }
  }
  return string;
};

// Main program

try {
  var pm = parse_prefix_map(process.env["BUILD_PATH_PREFIX_MAP"]);
  // var i = 2 is just how nodejs yolos its way through common conventions
  for (var i = 2, l = process.argv.length; i < l; ++i) {
    console.log(map_prefix(process.argv[i], pm));
  }
} catch (e) {
  console.error(e.stack);
  process.exit(1); // older versions returned 8, messing up our CI testing
}