During tree construction, internal lookup tables control the rendering
transformations. You can add to them using procedure qcons-declare!.
Declare as part of category (a keyword) the symbol x. extra information may be required for the particular category. Currently, these categories are recognized:
#:infix- Render
(x A B ...)as( A x B x ...).#:postfix- Render
(x A)as( A x ).#:display-alias- Render
xas something else. extra is a string that specifies what to display instead of x. For example,null?andnot-null?are pre-declared to render asIS NULLandIS NOT NULL, respectively.#:keyword-args-ok- Render
(x A B ...)asx (A, B, ...)if none ofA,B, ... are keywords. In the presence of keywords, render it asx (A B ...), without any commas in the argument list.
The rest of this section presents various lists of built-in declarations.
Using qcons-declare! on a built-in symbol overwrites the associated
value (if any). There is no undeclare support.
These are the infix operators.
|| ||/ |/ / !! % ^
* - + @ & | << >>
&& &< &> <-> <^ >^ ?-
?-| @-@ ?| ?|| @@ ~=
<<= >>= # ## ?# = <
<= > >= <> != all any
in like not-like ilike
not-ilike ~~ !~~ ~~* !~~*
similar not-similar ~ ~* !~
!~*
These are the postfix operators.
! null? not-null? true?
not-true? false? not-false?
unknown? not-unknown?
Display aliases exist for these symbols.
null? not-null? true?
not-true? false? not-false?
unknown? not-unknown? not-like
not-ilike similar not-similar
These functions render differently depending on the presence of keyword args.
substring convert overlay
position trim extract