Re: [Nano-devel] [PATCH] syntax: c: change the highlighting of preprocessor directives

[Benno Schulenberg]

Op 13-12-17 om 06:48 schreef Liu Hao:
> On 2017/12/10 22:38, Benno Schulenberg wrote:
> > +# Preprocessor directives.
> > +color brightcyan 
> > start="^[[:space:]]*#[[:space:]]*(if(n?def)?|elif|warning|error|pragma)\>" 
> > end="[^\\]$"
>
> There is an issue here:
>
> With this patch, both of the following lines are colored:
>
> ```
> #warning
> blah blah
> ```
>
> This is not the case if a space is appended to the first line.
> Apparently `\>` matches the zero-length span between the word `warning`
> and the LF following it immediately, but the LF of the first line is
> skipped somehow when searching for termination of the PP directive,
> resulting in the LF of the second line being the eventual terminator.

The "end=" part wants a character that is not a backslash and that is
not part of what the "start=" matched.  The "start=" and "end=" parts
cannot overlap each other.  I do not know how to solve this.

(There is an additional problem: if you type a space after "#warning",
the coloring of "blah blah" is dropped.  But if you then remove the
space again, "blah blah" is not recolored.  Only when typing ^S or ^L
does the color return.  So a change in the multiline regex matching is
not always detected.  But that is a different kind of bug.)

Benno