Hi all.
My friends found weird behavior of vimscript.
Try following code.
---------------------------------------------------------
let dict = {}
function! dict.func()
echo "fooooo"
return self
endfunction
echo "=========== test1"
if 1 | echo dict.func().func() | endif
echo "=========== test2"
if 1 | let a = dict.func().func() | endif
echo "=========== test3"
if 1 | call dict.func().func() | endif
echo "=========== test4"
if 0 | call dict.func().func() | endif
---------------------------------------------------------
You'll get following errors.
---------------------------------------------------------
=========== test1
fooooo
fooooo
{'func': function('18')}
=========== test2
fooooo
fooooo
=========== test3
fooooo
fooooo
=========== test4
Error detected while processing C:\temp\test.vim:
line 14:
E488: Trailing characters
line 15:
E171: Missing :endif
Press ENTER or type command to continue
---------------------------------------------------------
Vimscript is treating letter '.' as two meanings.
One of them is 'concat string'. Another is 'reference dictionary
item'.
Vim don't know that '.' is either one without evaluating script.
Thus, CURRENTLY, vim is evaluating subscript gracefully and doing no-
performs.
For example, When the code that blocked like 'if 0 | call dict.foo() |
endif',
'foo()' return 1 instead of 'self'.
i.e. Second time of calling func() is treating 'concat string'.
If it is broked in 'if 1', then the result should be 'self' of course.
And, this problem happen only by 'call' command.
This dont happend by 'echo', 'let'.
I think that 'if 0 / endif block' can be possible to skip until eol or
'|'.
Below is a patch to skip until that. And success to run above test
code.
Please check this way.
If you accept this way, vim may have another commands turn of this
case.
Thanks.
- Yasuhiro Matsumoto
diff -r 94694351f592 src/eval.c
--- a/src/eval.c Fri Oct 15 20:20:05 2010 +0200
+++ b/src/eval.c Wed Oct 20 21:12:58 2010 +0900
@@ -3337,6 +3337,11 @@
int failed = FALSE;
funcdict_T fudi;
+ if (eap->skip) {
+ eap->nextcmd = find_nextcmd(eap->arg);
+ return;
+ }
+
tofree = trans_function_name(&arg, eap->skip, TFN_INT, &fudi);
if (fudi.fd_newkey != NULL)
{
--
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