From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
---|---|
To: | Ricardo Malafaia <rmalafaia(at)gmail(dot)com> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Fwd: polite request about syntax |
Date: | 2006-09-15 16:42:25 |
Message-ID: | 450AD7F1.1010806@dunslane.net |
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Thread: | |
Lists: | pgsql-hackers |
Ricardo Malafaia wrote:
>
> And the $$ is indeed needed for allowing languages with different
> syntaxes. agreed. However, Tom, i could counter example your plperl
> example:
>
>> realize that qq/end/ does not represent a matching "end"?
>
> What happens then when it sees something like a double variable
> interpolation as in $$foobar? ;)
>
The delimiter does not have to be $$. It can be
$any_unquoted_identifier_without_a_dollar_sign$.
the lexer says:
/* $foo$ style quotes ("dollar quoting")
* The quoted string starts with $foo$ where "foo" is an optional string
* in the form of an identifier, except that it may not contain "$",
* and extends to the first occurrence of an identical string.
* There is *no* processing of the quoted text.
*
*/
dolq_start [A-Za-z\200-\377_]
dolq_cont [A-Za-z\200-\377_0-9]
dolqdelim \$({dolq_start}{dolq_cont}*)?\$
So for a plperl function you just use something like $func$ at each end.
cheers
andrew
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