DEPRECATED! See notes in code and in first comment. (Bitsy game engine mod to load game data from an external file or URL)

bitsy-import-external-game-data.js

/*
  ************************************************************************
  THIS GIST IS OUTDATED
  
  There's a new version published in the bitsy-hacks repo, which fixes
  some bugs. Go get it instead!
  
  Direct link to the external game data mod: 
  https://raw.githubusercontent.com/seleb/bitsy-hacks/master/external-game-data.js

  bitsy-hacks repo at: https://github.com/seleb/bitsy-hacks
  ************************************************************************






  =================================
  EXTERNAL GAME DATA MOD (mildmojo)
  =================================

  Usage: IMPORT <file or URL>

  Examples: IMPORT frontier.bitsydata
            IMPORT http://my-cool-website.nz/frontier/frontier.txt
            IMPORT /games/frontier/data/frontier.txt

  Installation:
    1. Paste this code in new script tags right after the last /script> tag
       in your exported game HTML file.
    2. Copy all your Bitsy game data from the top of your HTML into another
       file and replace it with an IMPORT statement that refers to that file.

  NOTE: Chrome can only fetch external files when they're served from a
        web server, not just opened from a file on disk. You could use Firefox
        or, if you have NodeJS or Python installed, try running one of these
        to serve the current directory from a local web server:
        https://gist.github.com/willurd/5720255

        If this mod finds an IMPORT statement anywhere in the Bitsy data
        contained in the HTML file, it will replace all game data with the
        IMPORTed data. It will not execute nested IMPORT statements in
        external files.

  License: WTFPL (do WTF you want)
*/

var _load_game = load_game;
load_game = function(game_data, startWithTitle) {
  tryImportGameData(game_data, function withGameData(err, importedData) {
    if (err) {
      console.error(err);
      console.warn('Make sure game data IMPORT statement refers to a valid file or URL.');
      _load_game(game_data, startWithTitle);
    } else {
      _load_game(importedData, startWithTitle);
    }
  });
};

function tryImportGameData(gameData, done) {
  var rejectBlanks = function(line) { return !line.match(/^\s*$/); };
  var lines = gameData.split("\n")
  lines = lines.filter(rejectBlanks);

  for (var i = 0; i < lines.length; i++) {
    if (getType(lines[i]) === "IMPORT") {
      var src = lines[i].split(/\s+/)[1];
      if (!src) return done('IMPORT requires a URL or path to a Bitsy data file!');
      return fetchData(src, done);
    } else {
      return done(null, gameData);
    }
  }
}

function fetchData(url, done) {
  var request = new XMLHttpRequest();
  request.open('GET', url, true);

  request.onload = function() {
    if (this.status >= 200 && this.status < 400) {
      // Success!
      return done(null, this.response);
    } else {
      return done('Failed to load game data: ' + request.statusText + ' (' + this.status + ')');
    }
  };

  request.onerror = function() {
    return done('Failed to load game data: ' + request.statusText);
  };

  request.send();
}

THIS GIST IS OUTDATED

There's a new version published in the bitsy-hacks repo, which fixes some bugs. Go get it instead!

• Direct link to the external game data mod
• bitsy-hacks repo