A.21 Predefined type predicates
R5RS primary predicates
| Type predicate | Description |
|---|
boolean? | boolean |
char? | character |
number? | number |
pair? | pair |
port? | port |
procedure? | procedure |
string? | string |
symbol? | symbol |
vector? | vector |
R5RS secondary predicates
| Type predicate | Description |
|---|
char-alphabetic? | alphabetic character |
char-lower-case? | lower-case character |
char-numeric? | numeric character |
char-upper-case? | upper-case character |
char-whitespace? | whitespace character |
complex? | complex number |
eof-object? | end-of-file object |
even? | even number |
exact? | exact number |
inexact? | inexact number |
input-port? | input port |
integer? | integer |
list? | list (use cheap-list?
for faster processing) |
negative? | negative number |
null? | null |
odd? | odd number |
output-port? | output port |
positive? | positive number |
rational? | rational number |
real? | real number |
zero? | zero |
Guile predicates
| Type predicate | Description |
|---|
hash-table? | hash table |
LilyPond scheme predicates
| Type predicate | Description |
|---|
boolean-or-symbol? | boolean or symbol |
cheap-list? | list (use this instead of
list? for faster processing) |
color? | color |
fraction? | fraction, as pair |
grob-list? | list of grobs |
index? | non-negative integer |
key? | index or symbol |
key-list? | list of indexes or symbols |
key-list-or-music? | key list or music |
key-list-or-symbol? | key list or symbol |
markup? | markup |
markup-command-list? | markup command list |
markup-list? | markup list |
moment-pair? | pair of moment objects |
number-list? | number list |
number-or-grob? | number or grob |
number-or-markup? | number or markup |
number-or-pair? | number or pair |
number-or-string? | number or string |
number-pair? | pair of numbers |
number-pair-list? | list of number pairs |
rational-or-procedure? | an exact rational or procedure |
rhythmic-location? | rhythmic location |
scheme? | any type |
string-or-music? | string or music |
string-or-pair? | string or pair |
string-or-symbol? | string or symbol |
symbol-list? | symbol list |
symbol-list-or-music? | symbol list or music |
symbol-list-or-symbol? | symbol list or symbol |
void? | void |
LilyPond exported predicates
| Type predicate | Description |
|---|
ly:book? | book |
ly:box? | box |
ly:context? | context |
ly:context-def? | context definition |
ly:context-mod? | context modification |
ly:dimension? | dimension, in staff space |
ly:dir? | direction |
ly:dispatcher? | dispatcher |
ly:duration? | duration |
ly:event? | post event |
ly:font-metric? | font metric |
ly:grob? | graphical (layout) object |
ly:grob-array? | array of grobs |
ly:grob-properties? | grob properties |
ly:input-location? | input location |
ly:item? | item |
ly:iterator? | iterator |
ly:lily-lexer? | lily-lexer |
ly:lily-parser? | lily-parser |
ly:listener? | listener |
ly:moment? | moment |
ly:music? | music |
ly:music-function? | music function |
ly:music-list? | list of music objects |
ly:music-output? | music output |
ly:otf-font? | OpenType font |
ly:output-def? | output definition |
ly:page-marker? | page marker |
ly:pango-font? | pango font |
ly:paper-book? | paper book |
ly:paper-system? | paper-system Prob |
ly:pitch? | pitch |
ly:prob? | property object |
ly:score? | score |
ly:skyline? | skyline |
ly:skyline-pair? | pair of skylines |
ly:source-file? | source file |
ly:spanner? | spanner |
ly:spring? | spring |
ly:stencil? | stencil |
ly:stream-event? | stream event |
ly:translator? | translator |
ly:translator-group? | translator group |
ly:undead? | undead container |
ly:unpure-pure-container? | unpure/pure container |
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