On Mon, Feb 1, 2010 at 8:28 PM, Kevin Curtis <[email protected]> wrote: > On Mon, Feb 1, 2010 at 11:13 PM, David Herman <[email protected]> wrote: >> >> In terms of mechanism, that's not exactly what I had in mind, but in terms >> of purpose that's the rough idea (specifically: "contexts are the means by >> which access to platform resources are mediated" -- yes). Creating new >> contexts would make it possible to restrict what modules can be imported, so >> you could create "pure" execution contexts in which you could evaluate code >> that would not have access to anything with interesting authority. This >> would of course be host-dependent. >> >> Dave >> > > Understood. Just a final point - modules that are imported with 'import' can > be native modules? That is modules that are implemented in C++.
Right. The host environment could provide some set of modules, along with some naming scheme for referring to them. > // compiler tries each in order > import ['JSON', 'http://json.org/modules/json2.js'] as JSON; > In the above case 'JSON' is a native module implemented in C++. If it > doesn't exist a pure ES solution is used. From the end user point of view it > is no matter if a module is implemented natively or via pure ES. In the strawman, 'JSON' could be implemented in pure ES - as long as it's declared in a place where the import statement can see it (in the same Program, say). In a modern browser, 'JSON' might be provided natively, but the strawman doesn't commit to that. > And it is possible, to configure a new context which will deny access to the > native JSON module to code and imported modules within this context - if the > developer desires. That's the idea (due to Kris Kowal). > Also, a general point. There has been discussion re ArrayBuffers. Would > 'native modules' be a way to present this functionality to ECMAScript. As an > alternative to putting them in the global object/namespace. > import ModArrayBuffer; // imports ArrayBuffer, Int32Array, Int16Array etc > buf = new ArrayBuffer(100); // create 100-byte ArrayBuffer > var ints = new Int32Array(buf); // view that buffer as 32-bit integers > var fourShorts = new Int16Array(buf, 20, 4); // Starting at byte 20 in the > buffer, create a 16-bit > // end Whatever we come up with for modules would be a good way to structure all of the potential additions in Harmony - ArrayBuffers, Proxies, etc. -- sam th [email protected] _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
