Re: Next Version of Lua
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- Subject: Re: Next Version of Lua
- From: David Manura <dm.lua@...>
- Date: 2009年6月12日 21:35:11 -0400
On Thu, Jun 11, 2009 at 10:58 PM, David Manura wrote:
> On Thu, Jun 11, 2009 at 12:45 PM, Michael Newberry wrote:
>> Here's another one:
>>
>> `=' expected near `ot'
>>
>> is thrown by
>>
>> ifn ot CMyClass then
>
> ... You might do this patch on assignments: ...
>
> ifn ot CMyClass then print() end
> --> stdin:1: ',', '(', or '=' expected near 'ot'
This patch to lparser.c:assignment may more practical:
--- lua-5.1.4/src/lparser.c
+++ lua-5.1.4-better-errors-2/src/lparser.c
@@ -944,7 +944,9 @@
}
else { /* assignment -> `=' explist1 */
int nexps;
- checknext(ls, '=');
+ if (ls->t.token != '=')
+ luaX_syntaxerror(ls, "unrecognized statement");
+ luaX_next(ls);
nexps = explist1(ls, &e);
if (nexps != nvars) {
adjust_assign(ls, nvars, nexps, &e);
Tests (old and new errors respectively):
a b c
--> stdin:1: '=' expected near 'b'
--> stdin:1: unrecognized statement near 'b'
If x then end
--> stdin:1: '=' expected near 'x'
--> stdin:1: unrecognized statement near 'x'
> x[1][2] y
--> stdin:1: '=' expected near 'y'
--> stdin:1: unrecognized statement near 'y'
a,b c
--> stdin:1: '=' expected near 'c'
--> stdin:1: unrecognized statement near 'c'