Re: Defining functions on the fly

["Andreas Röhler" <andreas.roehler@easy-emacs.de>]

Am 15.06.2015 um 13:52 schrieb Tassilo Horn:
> Andreas Röhler <andreas.roehler@easy-emacs.de> writes:
>
>> It's not about duplication, but derivation. The original DTRT in most
>> cases.
>>
>> Point of interest are the exceptions - see for example in Elixir
>>
>> https://github.com/elixir-lang/emacs-elixir/issues/185
>>
>> "\"foo\""  |>  String.strip(?")
>>
>> Where the doublquote after question mark makes Emacs think it's a
>> string-start - which isn't.
> String recognition in emacs is usually done using syntax tables, so get
> the elixir syntax table right and then you don't need any workarounds.
> In this case, it seems plain syntax tables aren't enough, though, so the
> elisp docs explain how to override certain characters' syntax on demand.
>
> ,----[ (info "(elisp)Syntax Properties") ]
> | When the syntax table is not flexible enough to specify the syntax of a
> | language, you can override the syntax table for specific character
> | occurrences in the buffer, by applying a ‘syntax-table’ text property.
> | *Note Text Properties::, for how to apply text properties.
> `----
>
> So basically, you (or elixir-mode) will want to define a
> `syntax-propertize-function' which finds occurrences of ?" and gives "/"
> (character quote) syntax to the ? in which the usual "\"" (string
> quotes) syntax of `"' would be ineffective for this single double quote.
>
> ,----[ (info "(elisp)Syntax Class Table") ]
> | Character quotes: ‘/’
> |      Characters used to quote the following character so that it loses
> |      its normal syntactic meaning.  This differs from an escape
> |      character in that only the character immediately following is ever
> |      affected.
> |
> |      Characters in this class count as part of words if
> |      ‘words-include-escapes’ is non-‘nil’.  *Note Word Motion::.
> `----
>
> Bye,
> Tassilo

Thanks again. Will see if a better example comes across WRT original 
question.