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Re: Here docs
- X-seq: zsh-workers 1874
- From: Zoltan Hidvegi <hzoli@xxxxxxxxxx>
- To: pws@xxxxxx (Peter Stephenson)
- Subject: Re: Here docs
- Date: Thu, 1 Aug 1996 16:07:40 +0200 (MET DST)
- Cc: zsh-workers@xxxxxxxxxxxxxxx
- In-reply-to: <199608011349.PAA09906@xxxxxxxxxxxx> from Peter Stephenson at "Aug 1, 96 03:49:39 pm"
- Organization: Dept. of Comp. Sci., Eotvos University, Budapest, Hungary
- Phone: (36 1)2669833 ext: 2667, home phone: (36 1) 2752368
Peter wrote:
> I expect Zoltan's already fixed this, but anyway...
Yes :-).
> > In this case, the backslash in the input will behave as the
> > backslash inside double-quotes (see Section 2.2.3) However, the
> > double-quote character (") will not be treated specially within a
> > here-document, except when the double-quote appears within $(), ``, or
> > ${}.
>
> That's clear enough for here documents... the question is what should
> happen at other times when zsh is parsing something in the same way.
> This is usually when tokenising a string that hadn't already been
Here is my patch, a bit different from yours. It fixes some other
inconsistencies and it also handles " in ${...} as reuired above. When I
read POSIX I was pleased to know that here ducuments should be parsed the
same way as double-quoted strings, and relaxed knowing that zsh does
exactly that. And indeed the problem was not really in the here-document
code. I did not notice this problem because configure coming with zsh
always ran fine.
Zoltan
*** Src/lex.c 1996/07/24 14:39:19 2.40
--- Src/lex.c 1996/08/01 13:47:44
***************
*** 996,1008 ****
while (((c = hgetc()) != endchar || bct ||
(math && ((pct > 0) || (brct > 0))) ||
intick) && !lexstop) {
switch (c) {
case '\\':
c = hgetc();
! if (c != '\n')
! add(c == '$' || c == '\\' || (c == '}' && !intick && bct) ||
! c == '\"' || c == '`' ? Bnull : '\\');
! else if (sub || unset(CSHJUNKIEQUOTES) || endchar != '"')
continue;
break;
case '\n':
--- 996,1015 ----
while (((c = hgetc()) != endchar || bct ||
(math && ((pct > 0) || (brct > 0))) ||
intick) && !lexstop) {
+ cont:
switch (c) {
case '\\':
c = hgetc();
! if (c != '\n') {
! if (c == '$' || c == '\\' || (c == '}' && !intick && bct) ||
! c == endchar || c == '`')
! add(Bnull);
! else {
! /* lexstop is implicitely handled here */
! add('\\');
! goto cont;
! }
! } else if (sub || unset(CSHJUNKIEQUOTES) || endchar != '"')
continue;
break;
case '\n':
***************
*** 1092,1098 ****
err = (!brct-- && math);
break;
case '"':
! if (intick || !endchar)
break;
if (bct) {
add(Dnull);
--- 1099,1105 ----
err = (!brct-- && math);
break;
case '"':
! if (intick || (!endchar && !bct))
break;
if (bct) {
add(Dnull);
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