More on WORD#[+args] and syntax file

Hi all,

I recently dropped a post titled "WORD # and syntax files", for help
about highlighting a WORD followed by some symbol.
The help I received, here and by direct mail, helped me in
understanding why I couldn't achieve the desired results, because the
formulation for selecting WORD# had been preceded by a similar request
through "syn keyword", and this covered the "syn match" I was
operating on WORD.

Just to be clear, this syntax file tries to emulate the DEC-10 BASIC
compiler syntax (1974). Now, what I did resolve (with your active
help) was for commands that accept a channel identifier, followed by
anything else; e.g.:

WRITE #1, A$
PRINT :3, A,B,C
INPUT 2, N$
READ :5, A$

the # symbol (that is not mandatory) means "sequential file", and
the : symbol (which must be written) is for random access files.

Now, in the DEC-10 BASIC, there are commands that don't accept
arguments after a channel identifier, but accept channel identifiers
as arguments:

RESTORE 2, #4, :5
RESTORE #2; 4, :5
RESTORE :3; :4, 3

The separator is a comma or a semicolon, the # (occasionally missing)
is for sequential, : is for random.

My purpose is to highlight the "RESTORE + channel" plus any other
channel arguments left, but leaving the separators (commas and
semicolons) not highlighted.

I tried, for RESTORE, with the following line:
syn match File "RESTORE\s*[#:]\s*\d\+[\s*[,;]\+\s*[#:]*\s*\d\+\s*]*"

that tries to grab RESTORE plus the first argument and then all other
arguments in turn (if any). But this doesn't work as expected, and
above all, with this model I get commas and semicolons highlighted.

Another model was to grab all arguments by their own with

syn match File "[#:]\d\+"

and RESTORE by its own, but this doesn't solve the fact that RESTORE 3
(perfectly legal, in BASIC) has a number as argument, that is not
highlighed (it should be written #3 for this). If I write

syn match File "[#:]*\d\+"

I of course get all numbers highlighted as well!

Any help? Any ideas?

Please, answer to tbin at libero dot it, if you want it, or directly
to this thread.

Thanks in advance, mates!

-- Antonio

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