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Fix docstring of dabbrev-abbrev-char-regexp

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* lisp/dabbrev.el (dabbrev-abbrev-char-regexp): Using a value of nil
is equivalent to "\\sw\\|\\s_", and has no special behavior.  If the
previous character doesn't match, we search backwards for one that
does, not throw an error.  Replace Lisp example with C based one to
make it clear that "symbol" means a sequence of word and symbol
constituent characters, not a Lisp symbol (Bug#358).
This commit is contained in:
Noam Postavsky 2017-03-24 10:47:19 -04:00
parent afe8849bac
commit 9a73707964
1 changed files with 13 additions and 15 deletions
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28
lisp/dabbrev.el
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@ -191,23 +191,21 @@ This variable has an effect only when the value of
This regexp will be surrounded with \\\\( ... \\\\) when actually used.
Set this variable to \"\\\\sw\" if you want ordinary words or
\"\\\\sw\\\\|\\\\s_\" if you want symbols (including characters whose
syntax is \"symbol\" as well as those whose syntax is \"word\".
\"\\\\sw\\\\|\\\\s_\" if you want symbols (including characters
whose syntax is \"symbol\" as well as those whose syntax is
\"word\"). The abbreviation is from point to the start of the
previous sequence of characters matching this variable.
The value nil has a special meaning: the abbreviation is from point to
previous word-start, but the search is for symbols.
The default value of nil is equivalent to \"\\\\sw\\\\|\\\\s_\".
For instance, if you are programming in Lisp, `yes-or-no-p' is a symbol,
while `yes', `or', `no' and `p' are considered words. If this
variable is nil, then expanding `yes-or-no-' looks for a symbol
starting with or containing `no-'. If you set this variable to
\"\\\\sw\\\\|\\\\s_\", that expansion looks for a symbol starting with
`yes-or-no-'. Finally, if you set this variable to \"\\\\sw\", then
expanding `yes-or-no-' signals an error because `-' is not part of a word;
but expanding `yes-or-no' looks for a word starting with `no'.
The recommended value is nil, which will make dabbrev default to
using \"\\\\sw\\\\|\\\\s_\"."
For instance, suppose the current buffer is in `c-mode'. If this
variable is nil or \"\\\\sw\\\\|\\\\s_\", then expanding
`debug_print_in_' looks for a symbol starting with
`debug_print_in_'. If you set this variable to \"\\\\sw\", that
expansion looks for a word prefixed with `in_' (e.g., it would
match `in_range', but not `in_close_range'). If expanding
`debug_print_in' it would look for a word starting with
`in' (e.g. `integer')."
:type '(choice (const nil)
regexp)
:group 'dabbrev)