LilyPond scheme predicates
These predicates are only available within LilyPond and defined in Scheme.
| Type predicate | Description |
|---|
alist? | association list (list of pairs) |
boolean-or-symbol? | boolean or symbol |
cheap-list? | list (use this instead of
list? for faster processing) |
color? | color |
exact-rational? | an exact rational number |
fraction? | fraction, as pair |
grob-list? | list of grobs |
index? | non-negative, exact integer |
index-or-markup? | index or markup |
key? | index or symbol |
key-list? | list of indices or symbols |
key-list-or-music? | key list or music |
key-list-or-symbol? | key list or symbol |
ly:skyline-pair? | pair of skylines |
markup? | markup |
markup-command-list? | markup command list |
markup-list? | markup list |
moment-pair? | pair of moment objects |
musical-length? | non-negative moment with no grace part |
non-negative-number? | non-negative number |
number-list? | number list |
number-or-grob? | number or grob |
number-or-pair? | number or pair |
number-or-string? | number or string |
number-pair? | pair of numbers |
number-pair-list? | list of number pairs |
positive-fraction? | positive, finite fraction, as pair |
positive-musical-length? | positive moment with no grace part |
positive-number? | positive number |
rational-or-procedure? | an exact rational or procedure |
rhythmic-location? | rhythmic location |
scale? | non-negative rational, fraction, or moment |
scheme? | any type |
string-or-music? | string or music |
string-or-pair? | string or pair |
string-or-symbol? | string or symbol |
symbol-key-alist? | alist, with symbols as keys |
symbol-list? | symbol list |
symbol-list-or-music? | symbol list or music |
symbol-list-or-symbol? | symbol list or symbol |
void? | void |