How to resolve the algorithm Sort a list of object identifiers step by step in the AppleScript programming language
Published on 12 May 2024 09:40 PM
How to resolve the algorithm Sort a list of object identifiers step by step in the AppleScript programming language
Table of Contents
Problem Statement
Object identifiers (OID) are strings used to identify objects in network data.
Show how to sort a list of OIDs, in their natural sort order.
Let's start with the solution:
Step by Step solution about How to resolve the algorithm Sort a list of object identifiers step by step in the AppleScript programming language
Source code in the applescript programming language
(* Shell sort
Algorithm: Donald Shell, 1959.
*)
on ShellSort(theList, l, r)
script o
property lst : theList
end script
set listLength to (count theList)
if (listLength > 1) then
-- Convert negative and/or transposed range indices.
if (l < 0) then set l to listLength + l + 1
if (r < 0) then set r to listLength + r + 1
if (l > r) then set {l, r} to {r, l}
-- Do the sort.
set stepSize to (r - l + 1) div 2
repeat while (stepSize > 0)
repeat with i from (l + stepSize) to r
set currentValue to item i of o's lst
repeat with j from (i - stepSize) to l by -stepSize
set thisValue to item j of o's lst
if (currentValue < thisValue) then
set item (j + stepSize) of o's lst to thisValue
else
set j to j + stepSize
exit repeat
end if
end repeat
if (j < i) then set item j of o's lst to currentValue
end repeat
set stepSize to (stepSize / 2.2) as integer
end repeat
end if
return -- nothing. The input list has been sorted in place.
end ShellSort
property sort : ShellSort
-- Test code: sort items 1 thru -1 (ie. all) of a list of strings, treating numeric portions numerically.
set theList to {"1.3.6.1.4.1.11.2.17.19.3.4.0.10", "1.3.6.1.4.1.11.2.17.5.2.0.79", "1.3.6.1.4.1.11.2.17.19.3.4.0.4", ¬
"1.3.6.1.4.1.11150.3.4.0.1", "1.3.6.1.4.1.11.2.17.19.3.4.0.1", "1.3.6.1.4.1.11150.3.4.0"}
considering numeric strings
sort(theList, 1, -1)
end considering
return theList
use AppleScript version "2.4" -- OS X 10.10 (Yosemite) or later
use framework "Foundation"
set theList to {"1.3.6.1.4.1.11.2.17.19.3.4.0.10", "1.3.6.1.4.1.11.2.17.5.2.0.79", "1.3.6.1.4.1.11.2.17.19.3.4.0.4", ¬
"1.3.6.1.4.1.11150.3.4.0.1", "1.3.6.1.4.1.11.2.17.19.3.4.0.1", "1.3.6.1.4.1.11150.3.4.0"}
set theArray to current application's class "NSMutableArray"'s arrayWithArray:(theList)
set theDescriptor to current application's class "NSSortDescriptor"'s sortDescriptorWithKey:("self") ¬
ascending:(true) selector:("localizedStandardCompare:")
tell theArray to sortUsingDescriptors:({theDescriptor})
return theArray as list
------------- SORTED LIST OF OBJECT IDENTIFIERS ------------
-- sortedIdentifiers :: [String] -> [String]
on sortedIdentifiers(xs)
script listCompare
on |λ|(x, y)
script go
on |λ|(a, xy)
if 0 ≠ a then
a
else
compare(|1| of xy, |2| of xy)
end if
end |λ|
end script
foldl(go, 0, zip(x, y))
end |λ|
end script
map(intercalate("."), ¬
sortBy(listCompare, ¬
map(compose(curry(my map)'s ¬
|λ|(my readint), splitOn(".")), xs)))
end sortedIdentifiers
---------------------------- TEST --------------------------
on run
unlines(sortedIdentifiers({¬
"1.3.6.1.4.1.11.2.17.19.3.4.0.10", ¬
"1.3.6.1.4.1.11.2.17.5.2.0.79", ¬
"1.3.6.1.4.1.11.2.17.19.3.4.0.4", ¬
"1.3.6.1.4.1.11150.3.4.0.1", ¬
"1.3.6.1.4.1.11.2.17.19.3.4.0.1", ¬
"1.3.6.1.4.1.11150.3.4.0"}))
end run
--------------------- LIBRARY FUNCTIONS --------------------
-- Tuple (,) :: a -> b -> (a, b)
on Tuple(a, b)
-- Constructor for a pair of values, possibly of two different types.
{type:"Tuple", |1|:a, |2|:b, length:2}
end Tuple
-- compare :: a -> a -> Ordering
on compare(a, b)
if a < b then
-1
else if a > b then
1
else
0
end if
end compare
-- compose (<<<) :: (b -> c) -> (a -> b) -> a -> c
on compose(f, g)
script
property mf : mReturn(f)
property mg : mReturn(g)
on |λ|(x)
mf's |λ|(mg's |λ|(x))
end |λ|
end script
end compose
-- concatMap :: (a -> [b]) -> [a] -> [b]
on concatMap(f, xs)
set lng to length of xs
set acc to {}
tell mReturn(f)
repeat with i from 1 to lng
set acc to acc & (|λ|(item i of xs, i, xs))
end repeat
end tell
return acc
end concatMap
-- curry :: ((a, b) -> c) -> a -> b -> c
on curry(f)
script
on |λ|(a)
script
on |λ|(b)
|λ|(a, b) of mReturn(f)
end |λ|
end script
end |λ|
end script
end curry
-- drop :: Int -> [a] -> [a]
-- drop :: Int -> String -> String
on drop(n, xs)
set c to class of xs
if script is not c then
if string is not c then
if n < length of xs then
items (1 + n) thru -1 of xs
else
{}
end if
else
if n < length of xs then
text (1 + n) thru -1 of xs
else
""
end if
end if
else
take(n, xs) -- consumed
return xs
end if
end drop
-- findIndices :: (a -> Bool) -> [a] -> [Int]
on findIndices(p, xs)
-- List of zero-based indices of
-- any matches for p in xs.
script
property f : mReturn(p)
on |λ|(x, i, xs)
if f's |λ|(x, i, xs) then
{i - 1}
else
{}
end if
end |λ|
end script
concatMap(result, xs)
end findIndices
-- foldl :: (a -> b -> a) -> a -> [b] -> a
on foldl(f, startValue, xs)
tell mReturn(f)
set v to startValue
set lng to length of xs
repeat with i from 1 to lng
set v to |λ|(v, item i of xs, i, xs)
end repeat
return v
end tell
end foldl
-- fst :: (a, b) -> a
on fst(tpl)
if class of tpl is record then
|1| of tpl
else
item 1 of tpl
end if
end fst
-- intercalate :: String -> [String] -> String
on intercalate(delim)
script
on |λ|(xs)
set {dlm, my text item delimiters} to ¬
{my text item delimiters, delim}
set s to xs as text
set my text item delimiters to dlm
s
end |λ|
end script
end intercalate
-- map :: (a -> b) -> [a] -> [b]
on map(f, xs)
-- The list obtained by applying f
-- to each element of xs.
tell mReturn(f)
set lng to length of xs
set lst to {}
repeat with i from 1 to lng
set end of lst to |λ|(item i of xs, i, xs)
end repeat
return lst
end tell
end map
-- mReturn :: First-class m => (a -> b) -> m (a -> b)
on mReturn(f)
-- 2nd class handler function lifted into 1st class script wrapper.
if script is class of f then
f
else
script
property |λ| : f
end script
end if
end mReturn
-- Returns a sequence-matching function for findIndices etc
-- matching :: [a] -> (a -> Int -> [a] -> Bool)
-- matching :: String -> (Char -> Int -> String -> Bool)
on matching(pat)
if class of pat is text then
set xs to characters of pat
else
set xs to pat
end if
set lng to length of xs
set bln to 0 < lng
if bln then
set h to item 1 of xs
else
set h to missing value
end if
script
on |λ|(x, i, src)
(h = x) and xs = ¬
(items i thru min(length of src, -1 + lng + i) of src)
end |λ|
end script
end matching
-- min :: Ord a => a -> a -> a
on min(x, y)
if y < x then
y
else
x
end if
end min
-- partition :: (a -> Bool) -> [a] -> ([a], [a])
on partition(f, xs)
tell mReturn(f)
set ys to {}
set zs to {}
repeat with x in xs
set v to contents of x
if |λ|(v) then
set end of ys to v
else
set end of zs to v
end if
end repeat
end tell
Tuple(ys, zs)
end partition
-- readInt :: String -> Int
on readint(s)
s as integer
end readint
-- snd :: (a, b) -> b
on snd(tpl)
if class of tpl is record then
|2| of tpl
else
item 2 of tpl
end if
end snd
-- Enough for small scale sorts.
-- Use instead sortOn (Ord b => (a -> b) -> [a] -> [a])
-- which is equivalent to the more flexible sortBy(comparing(f), xs)
-- and uses a much faster ObjC NSArray sort method
-- sortBy :: (a -> a -> Ordering) -> [a] -> [a]
on sortBy(f, xs)
if length of xs > 1 then
set h to item 1 of xs
set f to mReturn(f)
script
on |λ|(x)
f's |λ|(x, h) ≤ 0
end |λ|
end script
set lessMore to partition(result, rest of xs)
sortBy(f, |1| of lessMore) & {h} & ¬
sortBy(f, |2| of lessMore)
else
xs
end if
end sortBy
-- splitOn :: [a] -> [a] -> [[a]]
-- splitOn :: String -> String -> [String]
on splitOn(pat)
script
on |λ|(src)
if class of src is text then
set {dlm, my text item delimiters} to ¬
{my text item delimiters, pat}
set xs to text items of src
set my text item delimiters to dlm
return xs
else
set lng to length of pat
script residue
on |λ|(a, i)
Tuple(fst(a) & ¬
{init(items snd(a) thru (i) of src)}, lng + i)
end |λ|
end script
set tpl to foldl(residue, ¬
Tuple({}, 1), findIndices(matching(pat), src))
return fst(tpl) & {drop(snd(tpl) - 1, src)}
end if
end |λ|
end script
end splitOn
-- unlines :: [String] -> String
on unlines(xs)
-- A single string formed by the intercalation
-- of a list of strings with the newline character.
set {dlm, my text item delimiters} to ¬
{my text item delimiters, linefeed}
set s to xs as text
set my text item delimiters to dlm
s
end unlines
-- zip :: [a] -> [b] -> [(a, b)]
on zip(xs, ys)
zipWith(my Tuple, xs, ys)
end zip
-- zipWith :: (a -> b -> c) -> [a] -> [b] -> [c]
on zipWith(f, xs, ys)
set lng to min(length of xs, length of ys)
set lst to {}
if 1 > lng then
return {}
else
tell mReturn(f)
repeat with i from 1 to lng
set end of lst to |λ|(item i of xs, item i of ys)
end repeat
return lst
end tell
end if
end zipWith
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