! Copyright (C) 2010 Doug Coleman.
! See http://factorcode.org/license.txt for BSD license.
USING: help.markup help.syntax ;
IN: slots.syntax

HELP: slots[
{ $description "Outputs several slot values to the stack." }
{ $example "USING: kernel prettyprint slots.syntax ;"
           "IN: slots.syntax.example"
           "TUPLE: rectangle width height ;"
           "T{ rectangle { width 3 } { height 5 } } slots[ width height ] [ . ] bi@"
           """3
5"""
} ;

HELP: slots{
{ $description "Outputs an array of slot values from a tuple." }
{ $example "USING: prettyprint slots.syntax ;"
           "IN: slots.syntax.example"
           "TUPLE: rectangle width height ;"
           "T{ rectangle { width 3 } { height 5 } } slots{ width height } ."
           "{ 3 5 }"
} ;

HELP: set-slots{
{ $description "Sets slot values in a tuple from an array." }
{ $example "USING: prettyprint slots.syntax kernel ;"
           "IN: slots.syntax.example"
           "TUPLE: rectangle width height ;"
           "rectangle new { 3 5 } set-slots{ width height } ."
           "T{ rectangle { width 3 } { height 5 } }"
} ;

HELP: set-slots[
{ $description "Sets slot values in a tuple from the stack." }
{ $example "USING: prettyprint slots.syntax kernel ;"
           "IN: slots.syntax.example"
           "TUPLE: rectangle width height ;"
           "rectangle new 3 5 set-slots[ width height ] ."
           "T{ rectangle { width 3 } { height 5 } }"
} ;

HELP: copy-slots{
{ $description "Copy slots from the first object to the second and return the second object." }
{ $example "USING: prettyprint slots.syntax kernel ;"
           "IN: slots.syntax.example"
           "TUPLE: thing1 a b ;"
           "TUPLE: thing2 a b c ;"
           "1 2 thing1 boa 11 22 33 thing2 boa copy-slots{ a b } ."
           "T{ thing2 { a 1 } { b 2 } { c 33 } }"
} ;

ARTICLE: "slots.syntax" "Slots syntax sugar"
"The " { $vocab-link "slots.syntax" } " vocabulary provides an alternative syntax for getting and setting multiple values of a tuple." $nl
"Syntax sugar for cleaving slots to the stack:"
{ $subsections POSTPONE: slots[ POSTPONE: get[ }
"Cleaving slots to an array:"
{ $subsections POSTPONE: slots{ POSTPONE: get{ }
"Setting slots from the stack:"
{ $subsections POSTPONE: set-slots[ POSTPONE: set[ }
"Setting slots from an array:"
{ $subsections POSTPONE: set-slots{ POSTPONE: set{ } ;

ABOUT: "slots.syntax"