use btoa as base64 encoder, inspired by @ashtuchkin

lib/coffee-script/browser.js

@@ -1,12 +1,36 @@
 // Generated by CoffeeScript 1.6.1
 (function() {
-  var CoffeeScript, runScripts,
+  var CoffeeScript, compile, isModernBrowser, runScripts,
     __indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i < l; i++) { if (i in this && this[i] === item) return i; } return -1; };
 
   CoffeeScript = require('./coffee-script');
 
   CoffeeScript.require = require;
 
+  isModernBrowser = typeof window !== "undefined" && window !== null ? function() {
+    if (btoa && JSON) {
+      return true;
+    }
+  } : function() {};
+
+  compile = function(code, options) {
+    var answer, js, res, v3SourceMap, _ref;
+    if (options == null) {
+      options = {};
+    }
+    res = void 0;
+    if (isModernBrowser()) {
+      options.sourceMap = true;
+      options.inline = true;
+      _ref = CoffeeScript.compile(code, options), js = _ref.js, v3SourceMap = _ref.v3SourceMap;
+      answer = btoa(v3SourceMap);
+      res = "" + js + "\n//@ sourceMappingURL=data:application/json;base64," + answer + "\n//@ sourceURL=coffeescript.coffee";
+    } else {
+      res = CoffeeScript.compile(code, options);
+    }
+    return res;
+  };
+
   CoffeeScript["eval"] = function(code, options) {
     var _ref;
     if (options == null) {
@@ -15,7 +39,7 @@
     if ((_ref = options.bare) == null) {
       options.bare = true;
     }
-    return eval(CoffeeScript.compile(code, options));
+    return eval(compile(code, options));
   };
 
   CoffeeScript.run = function(code, options) {
@@ -23,7 +47,7 @@
       options = {};
     }
     options.bare = true;
-    return Function(CoffeeScript.compile(code, options))();
+    return Function(compile(code, options))();
   };
 
   if (typeof window === "undefined" || window === null) {
@@ -35,6 +59,7 @@
     if (options == null) {
       options = {};
     }
+    options.sourceFiles = [url];
     xhr = window.ActiveXObject ? new window.ActiveXObject('Microsoft.XMLHTTP') : new XMLHttpRequest();
     xhr.open('GET', url, true);
     if ('overrideMimeType' in xhr) {
@@ -84,6 +109,7 @@
         if (script.src) {
           return CoffeeScript.load(script.src, execute, options);
         } else {
+          options.sourceFiles = ['embedded'];
           CoffeeScript.run(script.innerHTML, options);
           return execute();
         }

lib/coffee-script/coffee-script.js

@@ -79,7 +79,7 @@
       };
       if (sourceMap) {
         answer.sourceMap = sourceMap;
-        answer.v3SourceMap = sourcemap.generateV3SourceMap(sourceMap, options);
+        answer.v3SourceMap = sourcemap.generateV3SourceMap(sourceMap, options, code);
       }
       return answer;
     } else {

lib/coffee-script/sourcemap.js

@@ -113,7 +113,7 @@
 
   })();
 
-  exports.generateV3SourceMap = function(sourceMap, options) {
+  exports.generateV3SourceMap = function(sourceMap, options, code) {
     var answer, generatedFile, lastGeneratedColumnWritten, lastSourceColumnWritten, lastSourceLineWritten, mappings, needComma, sourceFiles, sourceRoot, writingGeneratedLine;
     if (options == null) {
       options = {};
@@ -155,6 +155,9 @@
       names: [],
       mappings: mappings
     };
+    if (options.inline) {
+      answer.sourcesContent = [code];
+    }
     return JSON.stringify(answer, null, 2);
   };
 

src/browser.coffee

@@ -3,21 +3,36 @@
 CoffeeScript = require './coffee-script'
 CoffeeScript.require = require
 
+isModernBrowser = if window? then -> true if btoa and JSON else ->
+
+compile = (code, options = {}) ->
+  res = undefined
+  if isModernBrowser()
+    options.sourceMap = true
+    options.inline = true
+    {js, v3SourceMap} = CoffeeScript.compile code, options
+    answer = btoa v3SourceMap
+    res = "#{js}\n//@ sourceMappingURL=data:application/json;base64,#{answer}\n//@ sourceURL=coffeescript.js"
+  else
+    res = CoffeeScript.compile code, options
+  res
+
 # Use standard JavaScript `eval` to eval code.
 CoffeeScript.eval = (code, options = {}) ->
   options.bare ?= on
-  eval CoffeeScript.compile code, options
+  eval compile code, options
 
 # Running code does not provide access to this scope.
 CoffeeScript.run = (code, options = {}) ->
   options.bare = on
-  Function(CoffeeScript.compile code, options)()
+  Function(compile code, options)()
 
 # If we're not in a browser environment, we're finished with the public API.
 return unless window?
 
 # Load a remote script from the current domain via XHR.
 CoffeeScript.load = (url, callback, options = {}) ->
+  options.sourceFiles = [url]
   xhr = if window.ActiveXObject
     new window.ActiveXObject('Microsoft.XMLHTTP')
   else
@@ -50,6 +65,7 @@ runScripts = ->
       if script.src
         CoffeeScript.load script.src, execute, options
       else
+        options.sourceFiles = ['embedded']
         CoffeeScript.run script.innerHTML, options
         execute()
   null

src/coffee-script.coffee

@@ -74,7 +74,7 @@ exports.compile = compile = (code, options = {}) ->
     answer = {js}
     if sourceMap
       answer.sourceMap = sourceMap
-      answer.v3SourceMap = sourcemap.generateV3SourceMap(sourceMap, options)
+      answer.v3SourceMap = sourcemap.generateV3SourceMap(sourceMap, options, code)
     answer
   else
     js

src/sourcemap.coffee

@@ -96,7 +96,7 @@ class exports.SourceMap
 # `options.sourceFiles` and `options.generatedFile` may be passed to set "sources" and "file",
 # respectively.  Note that `sourceFiles` must be an array.
 
-exports.generateV3SourceMap = (sourceMap, options={}) ->
+exports.generateV3SourceMap = (sourceMap, options={}, code) ->
   sourceRoot = options.sourceRoot or ""
   sourceFiles = options.sourceFiles or [""]
   generatedFile = options.generatedFile or ""
@@ -159,6 +159,7 @@ exports.generateV3SourceMap = (sourceMap, options={}) ->
     names: []
     mappings
   }
+  answer.sourcesContent = [code] if options.inline
 
   return JSON.stringify answer, null, 2
 
@@ -252,3 +253,4 @@ exports.vlqDecodeValue = (str, offset=0) ->
   if signBit then value = -value
 
   return [value, consumed]
+