PATCH: Re: Bug in ${(z)...} lexing, or what?

[Sven Wischnowsky <wischnow@informatik.hu-berlin.de>]

Bart Schaefer wrote:

> On Jul 12,  5:57pm, Peter Stephenson wrote:
> } Subject: Re: Bug in ${(z)...} lexing, or what?
> }
> } That was before applying the patch (the correct behaviour).  After, I get:
> } 
> } [[
> } a
> } =
> } (
> } ;
> } 
> } with interactivecomments set (which is wrong), and what Sven was reporting
> } without it (which isn't great).  I'd much prefer the old behaviour in this
> } case, but the interactivecomments variant is definitely broken.
> 
> The situation is exactly reversed inside a ZLE widget:  The behavior with
> both interactivecomments and without is now correct inside the widget, but
> broken outside.
> 
> So was all Sven's patch acheived to invert some condition?

No. This was dependent on zle being loaded and the value of ll (line
length). The lexing code calls gotword() where that is used and where
it may reset zleparse to zero. So using zleparse as a token for `don't 
recognize comments' won't work.

And that sometimes triggered the test at lex.c:1553 (line number after 
this patch) in exalias() so that the `[[' wasn't recognised as
introducing a condition. So incond wasn't set and the whole things was 
parsed like a command, without the double-meaning-of-a-leading-( Peter 
mentioned.

So this patch solves only the comment-thing. And it changes things so
that `[[ (#i)foo ]]' now always fails to report the `(#i)foo' as one
string, independent of what is before or after the `[['. This is
because it now correctly recognises that there is a condition being
started.

Now we need a way to detect which opening parens in conditions are
parts of words and I'm not sure where and when to do that (Peter?).

Faking `incond = 0' in bufferwords after the call to ctxtlex() won't
work because then we don't get parens in conditions used for grouping
one by one, we get the whole group as one string.

Ideas, anyone?

Bye
 Sven

Index: Src/hist.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/hist.c,v
retrieving revision 1.9
diff -u -r1.9 hist.c
--- Src/hist.c	2000/07/12 10:31:29	1.9
+++ Src/hist.c	2000/07/13 08:39:32
@@ -2057,16 +2057,16 @@
 mod_export LinkList
 bufferwords(LinkList list, char *buf, int *index)
 {
-    int num = 0, cur = -1, got = 0, ne = noerrs, ocs = cs;
-    int owb = wb, owe = we, oadx = addedx, ozp = zleparse, oexp = expanding;
+    int num = 0, cur = -1, got = 0, ne = noerrs, ocs = cs, oll = ll;
+    int owb = wb, owe = we, oadx = addedx, ozp = zleparse, onc = nocomments;
     char *p;
 
     if (!list)
 	list = newlinklist();
 
-    zleparse = 3;
+    zleparse = 1;
     addedx = 0;
-    noerrs = expanding = 1;
+    noerrs = 1;
     lexsave();
     if (buf) {
 	int l = strlen(buf);
@@ -2076,7 +2076,8 @@
 	p[l] = ' ';
 	p[l + 1] = '\0';
 	inpush(p, 0, NULL);
-	cs = 0;
+	cs = strlen(p) + 1;
+	nocomments = 1;
     } else if (!isfirstln && chline) {
 	p = (char *) zhalloc(hptr - chline + ll + 2);
 	memcpy(p, chline, hptr - chline);
@@ -2092,6 +2093,7 @@
 	p[ll + 1] = '\0';
 	inpush(p, 0, NULL);
     }
+    ll = strlen(p);
     if (cs)
 	cs--;
     strinbeg(0);
@@ -2133,10 +2135,11 @@
     inpop();
     errflag = 0;
     zleparse = ozp;
-    expanding = oexp;
+    nocomments = onc;
     noerrs = ne;
     lexrestore();
     cs = ocs;
+    ll = oll;
     wb = owb;
     we = owe;
     addedx = oadx;
Index: Src/lex.c
===================================================================
RCS file: /cvsroot/zsh/zsh/Src/lex.c,v
retrieving revision 1.9
diff -u -r1.9 lex.c
--- Src/lex.c	2000/07/12 10:31:29	1.9
+++ Src/lex.c	2000/07/13 08:39:33
@@ -116,7 +116,12 @@
 
 /**/
 mod_export int parend;
+
+/* don't recognize comments */
  
+/**/
+mod_export int nocomments;
+
 /* text of puctuation tokens */
 
 /**/
@@ -672,8 +677,8 @@
 
     /* chars in initial position in word */
 
-    if (c == hashchar &&
-	((zleparse != 3 && isset(INTERACTIVECOMMENTS)) ||
+    if (c == hashchar && !nocomments &&
+	(isset(INTERACTIVECOMMENTS) ||
 	 (!zleparse && !expanding &&
 	  (!interact || unset(SHINSTDIN) || strin)))) {
 	/* History is handled here to prevent extra  *

--
Sven Wischnowsky                         wischnow@informatik.hu-berlin.de