[REBOL] Associative Data Store Re:(2)
From: al:bri:xtra at: 19-Sep-2000 19:36
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Here's another version of %Associate.r that should cope with the tests that
Ladislav and Joel have thrown at it.
I haven't yet worked out how to fix Ladislav's concern yet:
> The other problem is, that your functions won't accept Any-type! values
for Key/Value
Comments and criticism gratefully accepted.
I'm sure that my wrapper around 'Find can be done better, too.
[
Rebol [
Title: "Associate"
Name: 'Associate
File: %Associate.r
Author: "Andrew Martin"
Email: [Al--Bri--xtra--co--nz]
Date: 19/September/2000
]
Associate!: make object! [
Find: function [Block [block!] Key] [Index] [
Index: Block
until [
Index: system/words/find/only Index Key
if not found? Index [return none]
either odd? offset? Block Index [
Index: next Index
false
][
true
]
]
Index
]
set 'Associate? function [Block [block!] Key] [Index] [
either found? Index: Find Block Key [
first second Index
][
none
]
]
set 'Associate function [Block [block!] Key Value] [Index] [
Index: Find Block Key
either none? Value [
if found? Index [
remove/part Index 2
]
][
Value: reduce [Value]
either found? Index [
change/only next Index Value
][
append Block reduce [Key Value]
]
]
Block
]
]
]
>> do %associate.r
>> blk: []
== []
>> Associate blk [2 3] 5
== [[2 3] [5]]
>> Associate? blk [2 3]
== 5
>> Associate blk 5 7
== [[2 3] [5] 5 [7]]
>> Associate blk [5] 9
== [[2 3] [5] 5 [7] [5] [9]]
>> Associate? blk 5
== 7
>> Associate? blk [5]
== 9
>> Associate? blk reduce [2 3]
== 5
>> Associate? blk reduce [[2 3]]
== none
>> Associate? blk reduce [[5]]
== none
>> blk: copy []
== []
>> associate blk [2] 3
== [[2] [3]]
>> associate? blk [2]
== 3
Andrew Martin
Nietzchean Rebolutionary...
ICQ: 26227169
http://members.ncbi.com/AndrewMartin/
http://members.xoom.com/AndrewMartin/
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[
Rebol [
Title: "Associate"
Name: 'Associate
File: %Associate.r
Author: "Andrew Martin"
Email: [Al--Bri--xtra--co--nz]
Date: 19/September/2000
]
Associate!: make object! [
Find: function [Block [block!] Key] [Index] [
Index: Block
until [
Index: system/words/find/only Index Key
if not found? Index [return none]
either odd? offset? Block Index [
Index: next Index
false
][
true
]
]
Index
]
set 'Associate? function [Block [block!] Key] [Index] [
either found? Index: Find Block Key [
first second Index
][
none
]
]
set 'Associate function [Block [block!] Key Value] [Index] [
Index: Find Block Key
either none? Value [
if found? Index [
remove/part Index 2
]
][
Value: reduce [Value]
either found? Index [
change/only next Index Value
][
append Block reduce [Key Value]
]
]
Block
]
]
]
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