Rebol Programming/apply
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USAGE:
[edit | edit source]APPLY func block /only
DESCRIPTION:
[edit | edit source]Apply a function to a reduced block of arguments.
APPLY is a function value.
ARGUMENTS
[edit | edit source]- func -- Function value to apply (Type: any-function)
- block -- Block of args, reduced first (unless /only) (Type: block)
REFINEMENTS
[edit | edit source]- /only -- Use arg values as-is, do not reduce the block
(SPECIAL ATTRIBUTES)
[edit | edit source]- throw
SOURCE CODE
[edit | edit source]apply: func [ "Apply a function to a reduced block of arguments." [throw] func [any-function!] "Function value to apply" block [block!] "Block of args, reduced first (unless /only)" /only "Use arg values as-is, do not reduce the block" /local words path todo noref value vars var v1 v2 v3 v4 v5 v6 v7 v8 v9 v10 v11 v12 v13 v14 v15 v16 v17 v18 v19 v20 ][ unless only [block: reduce block] words: first :func vars: [ v1 v2 v3 v4 v5 v6 v7 v8 v9 v10 v11 v12 v13 v14 v15 v16 v17 v18 v19 v20 ] path: to-path [func] todo: head insert/only make block! 1 + length? block path noref: false while [not tail? words] [ set/any 'value pick block 1 switch type?/word first words [ word! [ unless noref [ either word? get/any 'value [ insert tail todo to-lit-word get/any 'value ] [ insert/only insert tail todo 'quote get/any 'value ] ] ] lit-word! [ unless noref [ either get-word? get/any 'value [ either var: pick vars 1 [vars: next vars] [ var: use [a] copy ['a] ] set var value insert tail todo to-get-word var ] [ insert/only tail todo get/any 'value ] ] ] get-word! [ unless noref [ either word? get/any 'value [ either var: pick vars 1 [vars: next vars] [ var: use [a] copy ['a] ] set var value insert tail todo var ] [ insert/only tail todo get/any 'value ] ] ] refinement! [ unless noref: not get/any 'value [ insert tail path to-word first words ] ] ] words: next words block: next block ] also do todo ( set [func words block path todo value vars var] set head vars none ) ]