https://github.com/gibson042/ecma262-proposal-json-superset
On Wed, Jul 19, 2017 at 12:36 AM, Mark S. Miller <erig...@google.com> wrote: > I argued for that in the old es3.1 days. IIRC so did Mike Samuel and > Crock. The pain of doing it now would be higher than it would have been > then. Nevertheless, I would still be in favor. > > Please draft a proposal. Thanks. > > > On Jul 18, 2017 8:16 PM, "Richard Gibson" <richard.gib...@gmail.com> > wrote: > > Another relevant option: Feature Request: Make ECMA262 a superset of JSON > <https://esdiscuss.org/topic/feature-request-make-ecma262-a-superset-of-json#content-8> > > On Tue, Jul 11, 2017 at 9:33 AM, Mike Samuel <mikesam...@gmail.com> wrote: > >> https://tc39.github.io/ecma262/#sec-json.parse says >> >> """ >> NOTE >> >> Valid JSON text is a subset of the ECMAScript PrimaryExpression syntax >> as modified by Step 4 above. Step 2 verifies that JText conforms to >> that subset, and step 6 verifies that that parsing and evaluation >> returns a value of an appropriate type. >> """ >> >> IIUC, if JSON text where a subset of PrimaryExpression then there >> should be no string that parses via JSON.parse which does not eval >> when wrapped in parentheses. >> On recent (Chrome, Safari, Firefox), >> >> var s = String.fromCharCode(0x22, 0x2028, 0x22) >> JSON.parse(s); // Passes >> eval('(' + s + ')'); // raises SyntaxError >> >> I believe the only reason it's not a subset is that both exclude line >> terminators from quoted string bodies but JSON does not treat U+2028 >> and U+2029 as line terminator chars while EcmaScript does. >> >> Could we change "is a subset of" to "is almost a subset of" or "is a >> subset (modulo LineTerminators) of"? >> >> >> Some related discussion at >> https://esdiscuss.org/topic/json-response-to-statement-from-w3c-tag >> _______________________________________________ >> es-discuss mailing list >> es-discuss@mozilla.org >> https://mail.mozilla.org/listinfo/es-discuss >> > > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss > > >
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