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
|
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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