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| author | Stefan Monnier <monnier@iro.umontreal.ca> | 2019-06-26 10:24:59 -0400 |
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| committer | Stefan Monnier <monnier@iro.umontreal.ca> | 2019-06-26 10:24:59 -0400 |
| commit | 0b4e003766f15225dede9bdba4ead33e493856e2 (patch) | |
| tree | 99de57fe8feeca540f398acb232b75e9c802418c /lisp/progmodes/cperl-mode.el | |
| parent | 699fce296b13d7db386b1cb5cecf2710e5196691 (diff) | |
| download | emacs-0b4e003766f15225dede9bdba4ead33e493856e2.tar.gz emacs-0b4e003766f15225dede9bdba4ead33e493856e2.tar.bz2 emacs-0b4e003766f15225dede9bdba4ead33e493856e2.zip | |
Revert "* lisp/calc/calc-ext.el (math-scalarp): Fix typo"
This reverts commit 698ff554ac2699ec48fefc85a1307cbc4a183b0d.
Diffstat (limited to 'lisp/progmodes/cperl-mode.el')
| -rw-r--r-- | lisp/progmodes/cperl-mode.el | 53 |
1 files changed, 51 insertions, 2 deletions
diff --git a/lisp/progmodes/cperl-mode.el b/lisp/progmodes/cperl-mode.el index d5ef37a4c02..254269ddf1a 100644 --- a/lisp/progmodes/cperl-mode.el +++ b/lisp/progmodes/cperl-mode.el @@ -480,7 +480,8 @@ Older version of this page was called `perl5', newer `perl'." :type 'string :group 'cperl-help-system) -(defcustom cperl-use-syntax-table-text-property t +(defcustom cperl-use-syntax-table-text-property + (boundp 'parse-sexp-lookup-properties) "Non-nil means CPerl sets up and uses `syntax-table' text property." :type 'boolean :group 'cperl-speed) @@ -699,7 +700,55 @@ install choose-color.el, available from `fill-paragraph' on a comment may leave the point behind the paragraph. It also triggers a bug in some versions of Emacs (CPerl tries -to detect it and bulk out).") +to detect it and bulk out). + +See documentation of a variable `cperl-problems-old-emaxen' for the +problems which disappear if you upgrade Emacs to a reasonably new +version (20.3 for Emacs, and those of 2004 for XEmacs).") + +(defvar cperl-problems-old-emaxen 'please-ignore-this-line + "Description of problems in CPerl mode specific for older Emacs versions. + +Emacs had a _very_ restricted syntax parsing engine until version +20.1. Most problems below are corrected starting from this version of +Emacs, and all of them should be fixed in version 20.3. (Or apply +patches to Emacs 19.33/34 - see tips.) XEmacs was very backward in +this respect (until 2003). + +Note that even with newer Emacsen in some very rare cases the details +of interaction of `font-lock' and syntaxification may be not cleaned +up yet. You may get slightly different colors basing on the order of +fontification and syntaxification. Say, the initial faces is correct, +but editing the buffer breaks this. + +Even with older Emacsen CPerl mode tries to corrects some Emacs +misunderstandings, however, for efficiency reasons the degree of +correction is different for different operations. The partially +corrected problems are: POD sections, here-documents, regexps. The +operations are: highlighting, indentation, electric keywords, electric +braces. + +This may be confusing, since the regexp s#//#/#; may be highlighted +as a comment, but it will be recognized as a regexp by the indentation +code. Or the opposite case, when a POD section is highlighted, but +may break the indentation of the following code (though indentation +should work if the balance of delimiters is not broken by POD). + +The main trick (to make $ a \"backslash\") makes constructions like +${aaa} look like unbalanced braces. The only trick I can think of is +to insert it as $ {aaa} (valid in perl5, not in perl4). + +Similar problems arise in regexps, when /(\\s|$)/ should be rewritten +as /($|\\s)/. Note that such a transposition is not always possible. + +The solution is to upgrade your Emacs or patch an older one. Note +that Emacs 20.2 has some bugs related to `syntax-table' text +properties. Patches are available on the main CPerl download site, +and on CPAN. + +If these bugs cannot be fixed on your machine (say, you have an inferior +environment and cannot recompile), you may still disable all the fancy stuff +via `cperl-use-syntax-table-text-property'.") (defvar cperl-praise 'please-ignore-this-line "Advantages of CPerl mode. |