How to achieve context-sensitive char syntax?
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Hello All,
I try to define a syntax table for a language which uses " for
string-quotes. Inside of strings " is used to char-quote ".
To get a string of two consecutive double-quotes one would write:
""""""
My conclusion is that this cannot be done with elisp syntax tables.
Am I correct?
Any suggestions?
Regards,
Adrian
Adrian Aichner writes:
Hello All,
I try to define a syntax table for a language which uses " for
string-quotes. Inside of strings " is used to char-quote ".
To get a string of two consecutive double-quotes one would write:
""""""
Yuck! Unless the langauge disallows empty strings, your example
could be parsed four different ways!
""""""
"" """"
"""" ""
"" "" ""
My conclusion is that this cannot be done with elisp syntax tables.
Am I correct?
Yes. The syntax you describe requires the " character
to be in two different syntax classes. Not possible.
Any suggestions?
Hack XEmacs to add an ad hoc syntax class for this language.
It's not without precedent. The syntax class for ' is tailored
for Lisp usage.
On Fri, 6 Aug 1999, Kyle Jones wrote:
Adrian Aichner writes:
>
> Hello All,
>
> I try to define a syntax table for a language which uses " for
> string-quotes. Inside of strings " is used to char-quote ".
>
> To get a string of two consecutive double-quotes one would write:
>
> """"""
SQL, for example: Select "He said ""Quote me"".".
Particularly, it makes
escaping simple: s/"/""/.
Yuck! Unless the langauge disallows empty strings, your example
could be parsed four different ways!
Probably not. The language would most likely disallow two strings without
any intervening lexical tokens. I don't see any ambiguity.
""""""
"" """"
"""" ""
"" "" ""
2-4 are strings followed by strings. The first is a single string of two
double quotes.
> My conclusion is that this cannot be done with elisp syntax
tables.
> Am I correct?
Yes. The syntax you describe requires the " character
to be in two different syntax classes. Not possible.
> Any suggestions?
Hack XEmacs to add an ad hoc syntax class for this language.
It's not without precedent. The syntax class for ' is tailored
for Lisp usage.
You could treat "testing""123" as two strings concatenated:
"testing"
followed by "123". Unless you want to treat the "" specially, it
should
be easy enough the ignore the special language construct (ie: it becomes
"). Disclaimer: I know nothing about xemacs syntax tables.
-Justin
vallon(a)mindspring.com
9438
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Adrian Aichner -
Justin Vallon -
Kyle Jones