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CC Mode 5.28 (Java); c-guess-basic-syntax guesses wrong sometimes


From: Espen Wiborg
Subject: CC Mode 5.28 (Java); c-guess-basic-syntax guesses wrong sometimes
Date: Thu, 12 Jun 2003 16:37:44 +0200

The code snippet below illustrates the problem - the comments are what
is displayed with c-echo-syntactic-information-p when indenting that
line.  As you can see, it guesses correctly for the line following the
first "default:" but incorrectly for the line following the second.

The problem lies in c-skip-case-statement-forward: After it skips the
second "default:", the call (c-in-literal safepos) on line 1074 leads
to parse-partial-sexp being called with FROM just before the
close-quote of the first "default:" and TO just before the close-quote
of the second.  parse-partial-sexp thus thinks the close-quote of the
first starts a string that ends with the open-quote of the second,
c-in-literal returns nil, and c-skip-case-statement-forward thinks
it's in a switch.

public static void main(String[] argv) {
    "default:";
    // syntax: ((comment-intro) (statement . 46)), indent: 4
    "default:";
         // syntax: ((comment-intro) (statement-case-intro . 124)), indent: 9
}
         
Emacs  : GNU Emacs 21.2.1 (i386-debian-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-03-22 on raven, modified by Debian
Package: CC Mode 5.28 (Java)
Buffer Style: java

c-emacs-features: (1-bit)

current state:
==============
(setq
 c-basic-offset 4
 c-comment-only-line-offset '(0 . 0)
 c-block-comment-prefix "* "
 c-comment-prefix-regexp '((pike-mode . "//+!?\\|\\**") (other . "//+\\|\\**"))
 c-cleanup-list '(scope-operator)
 c-hanging-braces-alist '((inline-open after) (brace-list-open)
                          (brace-entry-open) (substatement-open after)
                          (block-close . c-snug-do-while)
                          (extern-lang-open after) (inexpr-class-open after)
                          (inexpr-class-close before))
 c-hanging-colons-alist nil
 c-hanging-semi&comma-criteria '(c-semi&comma-inside-parenlist)
 c-backslash-column 48
 c-label-minimum-indentation 1
 c-offsets-alist '((string . c-lineup-dont-change)
                   (c . c-lineup-C-comments)
                   (defun-open . 0)
                   (defun-close . 0)
                   (defun-block-intro . +)
                   (class-open . 0)
                   (class-close . 0)
                   (inline-close . 0)
                   (knr-argdecl . 0)
                   (topmost-intro . 0)
                   (member-init-intro . +)
                   (member-init-cont . c-lineup-multi-inher)
                   (inher-intro . +)
                   (block-open . 0)
                   (block-close . 0)
                   (brace-list-open . 0)
                   (brace-list-close . 0)
                   (brace-list-intro . +)
                   (brace-list-entry . 0)
                   (brace-entry-open . 0)
                   (statement . 0)
                   (statement-case-intro . +)
                   (substatement . +)
                   (case-label . 0)
                   (do-while-closure . 0)
                   (else-clause . 0)
                   (catch-clause . 0)
                   (comment-intro . c-lineup-comment)
                   (arglist-cont . 0)
                   (arglist-cont-nonempty . c-lineup-arglist)
                   (stream-op . c-lineup-streamop)
                   (inclass . +)
                   (cpp-macro . [0])
                   (cpp-macro-cont . c-lineup-dont-change)
                   (friend . 0)
                   (objc-method-intro . [0])
                   (objc-method-args-cont . c-lineup-ObjC-method-args)
                   (objc-method-call-cont . c-lineup-ObjC-method-call)
                   (extern-lang-open . 0)
                   (extern-lang-close . 0)
                   (inextern-lang . +)
                   (namespace-open . 0)
                   (namespace-close . 0)
                   (innamespace . +)
                   (template-args-cont c-lineup-template-args +)
                   (inlambda . c-lineup-inexpr-block)
                   (lambda-intro-cont . +)
                   (inexpr-statement . 0)
                   (inexpr-class . +)
                   (inline-open . 0)
                   (topmost-intro-cont . +)
                   (statement-block-intro . +)
                   (knr-argdecl-intro . 5)
                   (substatement-open . +)
                   (label . +)
                   (statement-case-open . +)
                   (statement-cont . +)
                   (arglist-intro . c-lineup-arglist-intro-after-paren)
                   (arglist-close . c-lineup-arglist)
                   (access-label . 0)
                   (inher-cont . c-lineup-java-inher)
                   (func-decl-cont . c-lineup-java-throws)
                   )
 c-delete-function 'delete-char
 c-electric-pound-behavior nil
 c-indent-comments-syntactically-p t
 c-tab-always-indent 'other
 defun-prompt-regexp nil
 tab-width 8
 comment-column 32
 parse-sexp-ignore-comments t
 auto-fill-function nil
 comment-multi-line t
 comment-start-skip "/\\*+ *\\|//+ *"
 fill-prefix nil
 paragraph-start "[     ]*\\(//+\\|\\**\\)[     ]*\\(@[a-zA-Z]+\\>\\|$\\)\\|^\f"
 adaptive-fill-mode t
 adaptive-fill-regexp "[        ]*\\(//+\\|\\**\\)[     ]*\\([  ]*\\([-|#;>*]+[ 
        ]*\\|(?[0-9]+[.)][      ]*\\)*\\)"
 )
-- 
Espen Wiborg <address@hidden>
The average person's left hand does 56% of the typing.





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