* Bug in hide-ifdef-mode
@ 2008-01-19 16:51 martin rudalics
0 siblings, 0 replies; only message in thread
From: martin rudalics @ 2008-01-19 16:51 UTC (permalink / raw)
To: emacs-devel
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To reproduce with Emacs -Q: Open src/data.c and do M-x hide-ifdef-mode.
Should get you something like:
Debugger entered--Lisp error: (error "Bad token in parenthesized expression: 125")
signal(error ("Bad token in parenthesized expression: 125"))
error("Bad token in parenthesized expression: %s" 125)
hif-factor()
hif-math()
hif-eq-expr()
hif-and-expr()
hif-or-expr()
hif-expr()
hif-parse-if-exp((lparen FLT_RADIX equal 2 and FLT_MANT_DIG equal 24 and FLT_MIN_EXP equal hif-minus 125 and FLT_MAX_EXP equal 128 rparen))
hif-canonicalize()
hif-possibly-hide()
hide-ifdef-guts()
hif-recurse-on(1351 1547)
hif-possibly-hide()
hide-ifdef-guts()
hide-ifdefs()
hide-ifdef-mode(toggle)
call-interactively(hide-ifdef-mode)
execute-extended-command(nil)
call-interactively(execute-extended-command)
The bug occurs when `hif-factor' tries to parse the unary minus in:
#if (FLT_RADIX == 2 && FLT_MANT_DIG == 24 \
&& FLT_MIN_EXP == -125 && FLT_MAX_EXP == 128)
The attached, somewhat naive, patch fixes the bug for me. Could someone
who uses `hide-ifdef-mode' on a regular basis check whether that fix
breaks something else. Thanks in advance.
[-- Attachment #2: hideif.patch --]
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*** progmodes/hideif.el Sat Jan 19 14:53:52 2008
--- progmodes/hideif.el Sat Jan 19 17:16:20 2008
***************
*** 473,478 ****
--- 473,486 ----
((numberp hif-token)
(prog1 hif-token (hif-nexttoken)))
+ ((memq hif-token '(hif-minus hif-plus))
+ (let (result math-op)
+ (while (memq hif-token '(hif-plus hif-minus))
+ (setq math-op hif-token)
+ (hif-nexttoken)
+ (setq result (list math-op result (hif-factor))))
+ result))
+
(t ; identifier
(let ((ident hif-token))
(if (memq ident '(or and))
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