1 files changed, 138 insertions, 0 deletions
diff --git a/lib/cjs.js b/lib/cjs.js
new file mode 100644
index 000000000..c7327f181
--- /dev/null
+++ b/lib/cjs.js
@@ -0,0 +1,138 @@
+/*
+  SystemJS CommonJS Format
+*/
+(function() {
+  // CJS Module Format
+  // require('...') || exports[''] = ... || exports.asd = ... || module.exports = ...
+  var cjsExportsRegEx = /(?:^\uFEFF?|[^$_a-zA-Z\xA0-\uFFFF.])(exports\s*(\[['"]|\.)|module(\.exports|\['exports'\]|\["exports"\])\s*(\[['"]|[=,\.]))/;
+  // RegEx adjusted from https://github.com/jbrantly/yabble/blob/master/lib/yabble.js#L339
+  var cjsRequireRegEx = /(?:^\uFEFF?|[^$_a-zA-Z\xA0-\uFFFF."'])require\s*\(\s*("[^"\\]*(?:\\.[^"\\]*)*"|'[^'\\]*(?:\\.[^'\\]*)*')\s*\)/g;
+  var commentRegEx = /(^|[^\\])(\/\*([\s\S]*?)\*\/|([^:]|^)\/\/(.*)$)/mg;
+
+  var stringRegEx = /("[^"\\\n\r]*(\\.[^"\\\n\r]*)*"|'[^'\\\n\r]*(\\.[^'\\\n\r]*)*')/g;
+
+  // used to support leading #!/usr/bin/env in scripts as supported in Node
+  var hashBangRegEx = /^\#\!.*/;
+
+  function getCJSDeps(source) {
+    cjsRequireRegEx.lastIndex = commentRegEx.lastIndex = stringRegEx.lastIndex = 0;
+
+    var deps = [];
+
+    var match;
+
+    // track string and comment locations for unminified source    
+    var stringLocations = [], commentLocations = [];
+
+    function inLocation(locations, match) {
+      for (var i = 0; i < locations.length; i++)
+        if (locations[i][0] < match.index && locations[i][1] > match.index)
+          return true;
+      return false;
+    }
+
+    if (source.length / source.split('\n').length < 200) {
+      while (match = stringRegEx.exec(source))
+        stringLocations.push([match.index, match.index + match[0].length]);
+
+      // TODO: track template literals here before comments
+      
+      while (match = commentRegEx.exec(source)) {
+        // only track comments not starting in strings
+        if (!inLocation(stringLocations, match))
+          commentLocations.push([match.index + match[1].length, match.index + match[0].length - 1]);
+      }
+    }
+
+    while (match = cjsRequireRegEx.exec(source)) {
+      // ensure we're not within a string or comment location
+      if (!inLocation(stringLocations, match) && !inLocation(commentLocations, match)) {
+        var dep = match[1].substr(1, match[1].length - 2);
+        // skip cases like require('" + file + "')
+        if (dep.match(/"|'/))
+          continue;
+        // trailing slash requires are removed as they don't map mains in SystemJS
+        if (dep[dep.length - 1] == '/')
+          dep = dep.substr(0, dep.length - 1);
+        deps.push(dep);
+      }
+    }
+
+    return deps;
+  }
+
+  hook('instantiate', function(instantiate) {
+    return function(load) {
+      var loader = this;
+      if (!load.metadata.format) {
+        cjsExportsRegEx.lastIndex = 0;
+        cjsRequireRegEx.lastIndex = 0;
+        if (cjsRequireRegEx.exec(load.source) || cjsExportsRegEx.exec(load.source))
+          load.metadata.format = 'cjs';
+      }
+
+      if (load.metadata.format == 'cjs') {
+        var metaDeps = load.metadata.deps;
+        var deps = load.metadata.cjsRequireDetection === false ? [] : getCJSDeps(load.source);
+
+        for (var g in load.metadata.globals)
+          if (load.metadata.globals[g])
+            deps.push(load.metadata.globals[g]);
+
+        var entry = createEntry();
+
+        load.metadata.entry = entry;
+
+        entry.deps = deps;
+        entry.executingRequire = true;
+        entry.execute = function(_require, exports, module) {
+          function require(name) {
+            if (name[name.length - 1] == '/')
+              name = name.substr(0, name.length - 1);
+            return _require.apply(this, arguments);
+          }
+          require.resolve = function(name) {
+            return loader.get('@@cjs-helpers').requireResolve(name, module.id);
+          };
+          // support module.paths ish
+          module.paths = [];
+          module.require = _require;
+
+          // ensure meta deps execute first
+          if (!load.metadata.cjsDeferDepsExecute)
+            for (var i = 0; i < metaDeps.length; i++)
+              require(metaDeps[i]);
+
+          var pathVars = loader.get('@@cjs-helpers').getPathVars(module.id);
+          var __cjsWrapper = {
+            exports: exports,
+            args: [require, exports, module, pathVars.filename, pathVars.dirname, __global, __global]
+          };
+
+          var cjsWrapper = "(function(require, exports, module, __filename, __dirname, global, GLOBAL";
+
+          // add metadata.globals to the wrapper arguments
+          if (load.metadata.globals)
+            for (var g in load.metadata.globals) {
+              __cjsWrapper.args.push(require(load.metadata.globals[g]));
+              cjsWrapper += ", " + g;
+            }
+
+          // disable AMD detection
+          var define = __global.define;
+          __global.define = undefined;
+          __global.__cjsWrapper = __cjsWrapper;
+
+          load.source = cjsWrapper + ") {" + load.source.replace(hashBangRegEx, '') + "\n}).apply(__cjsWrapper.exports, __cjsWrapper.args);";
+
+          __exec.call(loader, load);
+
+          __global.__cjsWrapper = undefined;
+          __global.define = define;
+        };
+      }
+
+      return instantiate.call(loader, load);
+    };
+  });
+})();