Data commit

Task/Inverted-syntax/00-META.yaml

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+---
+from: http://rosettacode.org/wiki/Inverted_syntax

Task/Inverted-syntax/00-TASK.txt

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+'''Inverted syntax with conditional expressions'''
+
+In traditional syntax conditional expressions are usually shown before the action within a statement or code block:
+
+<syntaxhighlight lang="pseudocode"> IF raining=true THEN needumbrella=true </syntaxhighlight>
+
+In inverted syntax, the action is listed before the conditional expression in the statement or code block:
+
+<syntaxhighlight lang="pseudocode"> needumbrella=true IF raining=true </syntaxhighlight>
+
+'''Inverted syntax with assignment'''
+
+In traditional syntax, assignments are usually expressed with the variable appearing before the expression:
+
+<syntaxhighlight lang="pseudocode"> a = 6</syntaxhighlight>
+
+In inverted syntax, the expression appears before the variable:
+<syntaxhighlight lang="pseudocode"> 6 = a</syntaxhighlight>
+
+'''Task'''
+
+The task is to demonstrate support for inverted syntax forms within the language by showing both the traditional and inverted forms.

Task/Inverted-syntax/6502-Assembly/inverted-syntax-1.6502

@@ -0,0 +1,6 @@
+loop_MySubroutine:
+; more than 127 bytes of code
+
+dex
+bne loop_MySubroutine ;assembler will display an error message that the branch is too far away.
+; rest of program

Task/Inverted-syntax/6502-Assembly/inverted-syntax-2.6502

@@ -0,0 +1,8 @@
+loop_mySubroutine:
+; more than 127 bytes of code
+
+dex
+beq continue
+     JMP loop_mySubroutine
+continue:
+; rest of program

Task/Inverted-syntax/6502-Assembly/inverted-syntax-3.6502

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+word $BEEF
+byte $EF,$BE

Task/Inverted-syntax/ALGOL-68/inverted-syntax.alg

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+# Inverted assignment                                                                       #
+# Assignment in Algol 68 is via ":=" which is automaically provided for all modes (types)   #
+# However we could define e.g. "=:" as an inverted assignment operator but we would need to #
+# define a separate operator for each mode, e.g. for integers and strings:                  #
+PRIO =: = 1;
+OP   =: = ( INT a,    REF INT    b )REF INT:    b := a;
+OP   =: = ( STRING a, REF STRING b )REF STRING: b := a;
+OP   =: = ( CHAR   a, REF STRING b )REF STRING: b := a;
+INT a, b; STRING s;
+    1 =: a;
+a + 1 =: b;
+  "?" =: s;
+print( ( a, b, s, newline ) );
+
+# There is one standard inverted assignment operator: +=: or PLUSTO which prepends a string #
+# to another:                                                                               #
+"bc"  =: s;
+"b"  +=: s;
+print( ( s, newline ) );
+
+# Inverted Conditional Expressions                                                          #
+# We could define an operator called WHEN perhaps, that would execute its left operand if   #
+# the right operand was TRUE. However the left operand would need to be a PROC VOID so the  #
+# syntax would not be as convientent as the standard IF-THEN-FI construct. E.g.:            #
+PRIO WHEN = 1;
+OP   WHEN = ( PROC VOID code, BOOL test )VOID: IF test THEN code FI;
+
+( VOID: print( ( "NO",  newline ) ) ) WHEN a = b;  # the anonymous PROC VOID is not called  #
+( VOID: print( ( "yes", newline ) ) ) WHEN a /= b  # the anonymous PROC VOID is called      #

Task/Inverted-syntax/ARM-Assembly/inverted-syntax-1.arm

@@ -0,0 +1,2 @@
+MOV R0,R3    ;copy R3 to R0
+ADD R2,R1,R5 ;add R1 to R5 and store the result in R2.

Task/Inverted-syntax/ARM-Assembly/inverted-syntax-2.arm

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+STR r0,[r4] ;store the contents of R0 into the memory location specified by R4.

Task/Inverted-syntax/ARM-Assembly/inverted-syntax-3.arm

@@ -0,0 +1,2 @@
+STMFD sp!,{r0-r12,lr} ;push r0 thru r12 and the link register
+LDMFD sp!,{r0-r12,pc} ;pop r0 thru r12, and the value that was in the link register is popped into the program counter.

Task/Inverted-syntax/Ada/inverted-syntax.ada

@@ -0,0 +1,5 @@
+Foo := 1;
+loop
+   exit when Foo = 10;
+   Foo := Foo + 1;
+end loop;

Task/Inverted-syntax/Arturo/inverted-syntax.arturo

@@ -0,0 +1,9 @@
+ifStatement: function [block, condition][
+    if condition -> do block
+]
+alias.infix {??} 'ifStatement
+
+do [
+    variable: true
+    [print "Variable is true!"] ?? variable
+]

Task/Inverted-syntax/Bracmat/inverted-syntax-1.bracmat

@@ -0,0 +1,3 @@
+double=.!arg+!arg;
+
+(=.!arg+!arg):(=?double); { inverted assignment syntax, same result as above. }

Task/Inverted-syntax/Bracmat/inverted-syntax-2.bracmat

@@ -0,0 +1,2 @@
+foo=3+7  { assigns 3+7 to foo }
+3+7:?foo { assigns 10 to foo }

Task/Inverted-syntax/C++/inverted-syntax.cpp

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+class invertedAssign {
+  int data;
+public:
+  invertedAssign(int data):data(data){}
+  int getData(){return data;}
+  void operator=(invertedAssign& other) const {
+    other.data = this->data;
+  }
+};
+
+
+#include <iostream>
+
+int main(){
+  invertedAssign a = 0;
+  invertedAssign b = 42;
+  std::cout << a.getData() << ' ' << b.getData() << '\n';
+
+  b = a;
+
+  std::cout << a.getData() << ' ' << b.getData() << '\n';
+}

Task/Inverted-syntax/C/inverted-syntax-1.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <stdlib.h>
+#define otherwise       do { register int _o = 2; do { switch (_o) {  case 1:
+#define given(Mc)       ;case 0: break; case 2: _o = !!(Mc); continue; } break; } while (1); } while (0)
+
+
+int foo() { return 1; }
+
+main()
+{
+        int a = 0;
+
+        otherwise  a = 4 given (foo());
+        printf("%d\n", a);
+        exit(0);
+}

Task/Inverted-syntax/C/inverted-syntax-2.c

@@ -0,0 +1,21 @@
+main()
+{
+        int a = 0;
+
+        do {
+                register int _o = 2;
+                do {
+                        switch (_o) {
+                        case 1:
+                                a = 4;
+                        case 0:
+                                break;
+                        case 2:
+                                _o = !!(foo());
+                                continue;
+                        } break;
+                } while (1);
+        } while (0);
+        printf("%d\n", a);
+        exit(0);
+}

Task/Inverted-syntax/Clojure/inverted-syntax-1.clj

@@ -0,0 +1,12 @@
+; normal
+(if (= 1 1)
+  (print "Math works."))
+
+; inverted
+(->> (print "Math still works.")
+     (if (= 1 1)))
+
+; a la Haskell
+(->> (print a " is " b)
+     (let [a 'homoiconicity
+           b 'awesome]))

Task/Inverted-syntax/Clojure/inverted-syntax-2.clj

@@ -0,0 +1,4 @@
+((fn [x] (* x x) 5) ; Define a lambda and call it with 5.
+
+(macroexpand-1 '(->> 5 (fn [x] (* x x))))
+(fn [x] (* x x) 5)  ; Define a lambda that returns 5 regardless.

Task/Inverted-syntax/Clojure/inverted-syntax-3.clj

@@ -0,0 +1,2 @@
+(= (mod (inc 42) 7)
+   (-> 42 inc (mod 7)))

Task/Inverted-syntax/CoffeeScript/inverted-syntax.coffee

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+alert "hello" if true
+alert "hello again" unless false # the same as the above; unless is a negated if.
+
+idx = 0
+arr = (++idx while idx < 10) # arr is [1,2,3,4,5,6,7,8,9,10]
+
+idx = 0
+arr = (++idx until idx is 10) # same as above; until is an inverted while.

Task/Inverted-syntax/Common-Lisp/inverted-syntax-1.lisp

@@ -0,0 +1,10 @@
+(eval-when (:compile-toplevel :load-toplevel :execute)
+  (defun unrev-syntax (form)
+    (cond
+      ((atom form) form)
+      ((null (cddr form)) form)
+      (t (destructuring-bind (oper &rest args) (reverse form)
+           `(,oper ,@(mapcar #'unrev-syntax args)))))))
+
+(defmacro rprogn (&body forms)
+  `(progn ,@(mapcar #'unrev-syntax forms)))

Task/Inverted-syntax/Common-Lisp/inverted-syntax-2.lisp

@@ -0,0 +1,14 @@
+(eval-when (:compile-toplevel :load-toplevel :execute)
+  (defun unrev-syntax (form)
+    (cond
+      ((atom form) form) ;; atom: leave alone
+      ((null (cdr form)) form) ;; one-element form: leave alone
+      ((null (cddr form)) ;; two-element form: swap
+       (destructuring-bind (arg oper) form
+         `(,oper ,(unrev-syntax arg))))
+      (t    ;; two or more args: swap last two, add others in reverse
+       (destructuring-bind (arg1 oper &rest args) (reverse form)
+        `(,oper ,(unrev-syntax arg1) ,@(mapcar #'unrev-syntax args)))))))
+
+(defmacro rprogn (&body forms)
+  `(progn ,@(mapcar #'unrev-syntax forms)))

Task/Inverted-syntax/D/inverted-syntax.d

@@ -0,0 +1,14 @@
+#!/usr/bin/rdmd
+
+import std.algorithm;
+
+void main() {
+    assert("Hello, World".length == 12);
+    assert("Cleanliness".startsWith("Clean"));
+
+    auto r = [1, 4, 2, 8, 5, 7]
+        .filter!(n => n > 2)
+        .map!(n => n * 2);
+
+    assert(r.equal([8, 16, 10, 14]));
+}

Task/Inverted-syntax/EchoLisp/inverted-syntax.l

@@ -0,0 +1,23 @@
+;; use reader macros to transform (a OP b) into (OP b a)
+
+(lib 'match)
+(define-macro invert-= (a <- b) (set! b a))
+(define-macro invert-IF (a 'IF b) (when b a))
+
+(define raining #f)
+
+(#t <- raining)
+raining
+    → #t
+('umbrella-need IF raining)
+    → umbrella-need
+
+(#f <- raining)
+('umbrella-need IF raining)
+    → #f
+
+;; debug mode
+(debug 3)
+('umbrella-need IF raining)
+💡 [0]     invert-IF → ('umbrella-need IF raining)
+compiled :: (#when raining 'umbrella-need)

Task/Inverted-syntax/Factor/inverted-syntax-1.factor

@@ -0,0 +1,4 @@
+1 1 + ! 2
+[ + 1 1 ] reverse call ! 2
+{ 1 2 3 4 5 } [ sq ] map ! { 1 4 9 16 25 }
+[ map [ sq ] { 1 2 3 4 5 } ] reverse call ! { 1 4 9 16 25 }

Task/Inverted-syntax/Factor/inverted-syntax-2.factor

@@ -0,0 +1,3 @@
+MACRO: pre ( quot -- quot ) reverse ;
+
+[ + 2 2 ] pre ! 4

Task/Inverted-syntax/Factor/inverted-syntax-3.factor

@@ -0,0 +1 @@
+[ + 3 + 2 2 ] pre ! 7

Task/Inverted-syntax/Factor/inverted-syntax-4.factor

@@ -0,0 +1,3 @@
+MACRO: pre ( quot -- quot ) 1 cut swap [ 0 ] dip reduce 1quotation ;
+
+[ + 1 2 3 4 5 ] pre ! 15

Task/Inverted-syntax/Factor/inverted-syntax-5.factor

@@ -0,0 +1,4 @@
+USE: infix
+[infix
+    5*(1+1) ! 10
+infix]

Task/Inverted-syntax/Fortran/inverted-syntax.f

@@ -0,0 +1 @@
+      INQUIRE(FILE = FILENAME(1:L), EXIST = MAYBE, ERR = 666, IOSTAT = RESULT)

Task/Inverted-syntax/FreeBASIC/inverted-syntax.basic

@@ -0,0 +1,13 @@
+' FB 1.05.0 Win64
+
+#Define ThenIf(a, b) If b Then a
+#Define InvertAssign(a, b) b = a
+
+Dim As Boolean needUmbrella = False, raining = True
+ThenIf(needUmbrella = True, raining = True)
+Print "needUmbrella = "; needUmbrella
+
+Dim As Integer b = 0, a = 3
+InvertAssign(a, b)
+Print "b is"; b
+Sleep

Task/Inverted-syntax/Go/inverted-syntax.go

@@ -0,0 +1,30 @@
+package main
+
+import "fmt"
+
+type ibool bool
+
+const itrue ibool = true
+
+func (ib ibool) iif(cond bool) bool {
+    if cond {
+        return bool(ib)
+    }
+    return bool(!ib)
+}
+
+func main() {
+    var needUmbrella bool
+    raining := true
+
+    // normal syntax
+    if raining {
+        needUmbrella = true
+    }
+    fmt.Printf("Is it raining? %t. Do I need an umbrella? %t\n", raining, needUmbrella)
+
+    // inverted syntax
+    raining = false
+    needUmbrella = itrue.iif(raining)
+    fmt.Printf("Is it raining? %t. Do I need an umbrella? %t\n", raining, needUmbrella)
+}

Task/Inverted-syntax/Haskell/inverted-syntax-1.hs

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+when :: Monad m => m () -> Bool -> m ()
+action `when` condition = if condition then action else return ()

Task/Inverted-syntax/Haskell/inverted-syntax-2.hs

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+func a b x = (x + y) / y
+  where y = a * b

Task/Inverted-syntax/Haskell/inverted-syntax-3.hs

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+func a b x =
+  let y = a * b in
+    (x + y) / y

Task/Inverted-syntax/Haskell/inverted-syntax-4.hs

@@ -0,0 +1,16 @@
+import Data.Bool (bool)
+
+main :: IO ()
+main = do
+  let raining = False
+
+  putStrLn $ bool "No need" "UMBRELLA !" raining
+  putStrLn $ flip bool "No need" "UMBRELLA !" raining
+
+  putStrLn "\n--------\n"
+
+  mapM_ putStrLn $
+    [bool, flip bool]
+      <*> ["No need"]
+      <*> ["UMBRELLA !"]
+      <*> [raining, not raining]

Task/Inverted-syntax/Icon/inverted-syntax.icon

@@ -0,0 +1,5 @@
+procedure main()
+raining := TRUE := 1                         # there is no true/false null/non-null will do
+if \raining then needumbrella := TRUE        # normal
+needumbrella := 1(TRUE, \raining)            # inverted (choose sub-expression 1)
+end

Task/Inverted-syntax/Jq/inverted-syntax-1.jq

@@ -0,0 +1 @@
+v as $x

Task/Inverted-syntax/Jq/inverted-syntax-2.jq

@@ -0,0 +1,2 @@
+o["a"] = 2
+# or equivalently: o.a = 2

Task/Inverted-syntax/Julia/inverted-syntax.julia

@@ -0,0 +1,7 @@
+macro inv(expr, cond)
+    cond isa Expr && cond.head == :if || throw(ArgumentError("$cond is not an if expression"))
+    cond.args[2] = expr
+    return cond
+end
+
+@inv println("Wow! Lucky Guess!") if true else println("Not!") end

Task/Inverted-syntax/Kotlin/inverted-syntax.kotlin

@@ -0,0 +1,9 @@
+// version 1.0.6
+
+infix fun Boolean.iif(cond: Boolean) = if (cond) this else !this
+
+fun main(args: Array<String>) {
+    val raining = true
+    val needUmbrella = true iif (raining)
+    println("Do I need an umbrella?  ${if(needUmbrella) "Yes" else "No"}")
+}

Task/Inverted-syntax/Latitude/inverted-syntax-1.latitude

@@ -0,0 +1,10 @@
+local 'raining = True.
+local 'needUmbrella = False.
+
+if (raining) then {
+  needUmbrella = True.
+} else {}.
+
+{ raining. } ifTrue {
+  needUmbrella = True.
+}.

Task/Inverted-syntax/Latitude/inverted-syntax-2.latitude

@@ -0,0 +1,14 @@
+#'Method when := {
+  localize.
+  if ($1) then {
+    this.
+  } else { }.
+}.
+
+#'Method unless := {
+  #'self when ($1 not).
+}.
+
+;; Example usage
+{ needUmbrella = True. } when (raining).
+{ needUmbrella = True. } unless (raining not).

Task/Inverted-syntax/Latitude/inverted-syntax-3.latitude

@@ -0,0 +1,7 @@
+global let= := { self slot ($2) = #'$1. }.
+
+local 'a = 6.
+println: a. ;; 6
+
+let 6 = 'b.
+println: b. ;; 6

Task/Inverted-syntax/Lua/inverted-syntax.lua

@@ -0,0 +1,8 @@
+a = {1,3,5,4,2} -- a "plain" table
+table.sort(a) -- library method passing a as param
+print(table.concat(a)) -- and again --> "12345"
+
+b = {1,3,5,4,2} -- a "plain" table, so far..
+setmetatable(b, {__index=table}) -- ..but now "meta-decorated"
+b:sort() -- syntax sugar passes b as "self"
+print(b:concat()) -- and again --> "12345"

Task/Inverted-syntax/M2000-Interpreter/inverted-syntax.m2000

@@ -0,0 +1,54 @@
+expr=lambda ->{
+      Print "ok"
+}
+ifrev=lambda (dothis, cond) ->{
+      if cond then call dothis()
+}
+a=1
+call ifrev(expr, a=1)
+
+\\ on module call
+Module Subtract (a, b) {
+      Push a-b
+}
+Module PrintTop {
+      Print Number
+}
+Subtract 10, 3 : PrintTop
+\\ pushing before calling in reverse order
+Push 3, 10 : Subtract : PrintTop
+\\ Before call PrintTop any parameter send to stack
+\\ So this works ok
+PrintTop 1000
+\\ on assignment
+Dim A(5)=1
+Global n=2
+Function AddOne (x) {
+      n++
+      =x
+}
+\\ Execution of left expression, then right expression
+A(n)=AddOne(5)
+Print A(n-1)=5, n=3
+\\ Execution of right expression, then left expression
+Let A(n)=AddOne(15)
+Print A(n)=15, n=4
+\\ This statement..
+Let X=1, Y=2
+\\ executed like these
+Push 2, 1 : Read X, Y
+
+\\ This is the CallBack way
+Module ExecCond {
+      Read &callback(), cond
+      if cond then call callback()
+}
+x=1
+\\ this aa() is a function but when we call it after transforming from Lazy$()
+\\ act as part of module so we see x, and alter it
+Function aa {
+      x++
+}
+a=1
+ExecCond Lazy$(&aa()), A=1
+Print x=2

Task/Inverted-syntax/M4/inverted-syntax.m4

@@ -0,0 +1,6 @@
+define(`thenif', `ifelse($2, $3, `$1')')dnl
+dnl
+ifelse(eval(23 > 5), 1, 23 is greater than 5)
+ifelse(eval(23 > 5), 0, math is broken)
+thenif(23 is greater than 5, eval(23 > 5), 1)
+thenif(math is broken, eval(23 > 5), 0)

Task/Inverted-syntax/Mathematica/inverted-syntax.math

@@ -0,0 +1,10 @@
+a = 4
+->4
+
+b = 5
+->5
+
+If[1<2,
+Print["This was expected"]
+]
+->This was expected

Task/Inverted-syntax/Mercury/inverted-syntax-1.mercury

@@ -0,0 +1,8 @@
+:- pred progress(int::in, int::in, int::out, int::out) is det.
+progress(Past, Future, At, Total) :-
+	At = Past + 1,
+	Total = Past + Future.
+
+progress(Past, Future, At, Total) :-
+        Past + Future = Total,
+        Past + 1 = At.

Task/Inverted-syntax/Mercury/inverted-syntax-2.mercury

@@ -0,0 +1,8 @@
+:- func example(int) = string.
+example(N) = S :-
+        from_int(N) = S0,
+        pad_left(S0, '0', 3, S).
+
+example(N) = S :-
+        pad_left(S0, '0', 3, S),
+        from_int(N) = S0.

Task/Inverted-syntax/Mercury/inverted-syntax-3.mercury

@@ -0,0 +1,7 @@
+main(IO0, IO) :-
+        io.write_string("Hello, ", IO0, IO1),
+        io.write_string("world!\n", IO1, IO).
+
+main(!IO) :-
+        io.write_string("Hello, ", !IO),
+        io.write_string("world!\n", !IO).

Task/Inverted-syntax/Mercury/inverted-syntax-4.mercury

@@ -0,0 +1,13 @@
+main(!IO) :-
+        io.write_string(X, !IO), io.nl(!IO),
+        some_long_uninteresting_thing(X).
+
+% this is the same:
+main(!IO) :-
+        some_long_uninteresting_thing(X),
+        io.write_string(X, !IO), io.nl(!IO).
+
+% but this is different!
+main(!IO) :-
+        io.nl(!IO), io.write_string(X, !IO),
+        some_long_uninteresting_thing(X).

Task/Inverted-syntax/Metafont/inverted-syntax.metafont

@@ -0,0 +1,2 @@
+x=6;
+7=y;

Task/Inverted-syntax/Nim/inverted-syntax.nim

@@ -0,0 +1,31 @@
+#--
+# if statements
+#--
+
+template `?`(expression, condition) =
+  if condition:
+    expression
+
+let raining = true
+var needUmbrella: bool
+
+# Normal syntax
+if raining: needUmbrella = true
+
+# Inverted syntax
+(needUmbrella = true) ? (raining == true)
+
+#--
+# Assignments
+#--
+
+template `~=`(right, left) =
+  left = right
+
+var a = 3
+
+# Normal syntax
+a = 6
+
+# Inverted syntax
+6 ~= a

Task/Inverted-syntax/OxygenBasic/inverted-syntax.basic

@@ -0,0 +1,17 @@
+macro cond(a,c)  {c then a}
+
+macro store(b,a) {a=b}
+
+sys a,c=10
+
+if c>4 then a=4
+
+'INVERTED SYNTAX FORMS:
+
+cond a=40, if c>4
+
+store 4,a
+
+'COMBINED:
+
+cond store(5,a), if c>4

Task/Inverted-syntax/PARI-GP/inverted-syntax.parigp

@@ -0,0 +1,4 @@
+fi(f, condition)=if(condition,f());
+
+if(raining, print("Umbrella needed"))
+fi(->print("Umbrella needed"), raining)

Task/Inverted-syntax/Perl/inverted-syntax-1.pl

@@ -0,0 +1,4 @@
+if ($guess == 6) { print "Wow! Lucky Guess!"; };    # Traditional syntax
+print 'Wow! Lucky Guess!' if $guess == 6;           # Inverted syntax (note missing braces and parens)
+unless ($guess == 6) { print "Sorry, your guess was wrong!"; }   # Traditional syntax
+print 'Huh! You Guessed Wrong!' unless $guess == 6;              # Inverted syntax

Task/Inverted-syntax/Perl/inverted-syntax-2.pl

@@ -0,0 +1,4 @@
+# Note that the results obtained by the inverted syntax form
+# may produce differing results from the traditional syntax form
+$a = $ok ? $b : $c;     # Traditional syntax
+($ok ? $b : $c) = $a;   # Inverted syntax

Task/Inverted-syntax/Perl/inverted-syntax-3.pl

@@ -0,0 +1,3 @@
+sub assign { $_[1] = $_[0] }
+$a = $b;       # Traditional syntax
+assign $b, $a; # Inverted syntax

Task/Inverted-syntax/Phix/inverted-syntax-1.phix

@@ -0,0 +1,20 @@
+(notonline)-->
+ <span style="color: #008080;">if</span> <span style="color: #008080;">end</span>
+ <span style="color: #0000FF;">(&</span><span style="color: #008000;">"test.exw"</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]</span><span style="color: #000000;">cl</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">system</span>
+ <span style="color: #008080;">then</span> <span style="color: #0000FF;">></span><span style="color: #000000;">2</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cl</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">length</span> <span style="color: #008080;">if</span>
+ <span style="color: #0000FF;">(&</span><span style="color: #008000;">"\n"</span><span style="color: #0000FF;">(</span><span style="color: #000000;">pgm</span><span style="color: #0000FF;">)</span><span style="color: #000000;">mung</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"test.exw"</span><span style="color: #0000FF;">)</span><span style="color: #000000;">write_file</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">{}</span>
+ <span style="color: #000000;">write_file</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span> <span style="color: #008080;">include</span>
+ <span style="color: #0000FF;">([$]</span><span style="color: #000000;">cl</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">get_text</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">pgm</span> <span style="color: #004080;">string</span>
+ <span style="color: #0000FF;">()</span><span style="color: #7060A8;">command_line</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">cl</span> <span style="color: #004080;">sequence</span>
+ <span style="color: #008080;">function</span> <span style="color: #008080;">end</span>
+ <span style="color: #0000FF;">(</span><span style="color: #008000;">"\n"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">lines</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">join</span> <span style="color: #008080;">return</span>
+ <span style="color: #008080;">for</span> <span style="color: #008080;">end</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">nup</span><span style="color: #0000FF;">,</span><span style="color: #000000;">rip</span><span style="color: #0000FF;">,((([</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span><span style="color: #000000;">lines</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">split</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">reverse</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">join</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">substitute_all</span> <span style="color: #0000FF;">=</span> <span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span><span style="color: #000000;">lines</span> <span style="color: #008080;">do</span> <span style="color: #0000FF;">(</span><span style="color: #000000;">lines</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">length</span> <span style="color: #008080;">to</span> <span style="color: #000000;">1</span><span style="color: #0000FF;">=</span><span style="color: #000000;">i</span> <span style="color: #008080;">for</span>
+ <span style="color: #0000FF;">((</span><span style="color: #008000;">"\r\n"</span><span style="color: #0000FF;">,(</span><span style="color: #000000;">rip</span><span style="color: #0000FF;">,</span><span style="color: #000000;">pun</span><span style="color: #0000FF;">,</span><span style="color: #000000;">pgm</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">substitute_all</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">split</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">reverse</span><span style="color: #0000FF;">=</span><span style="color: #000000;">lines</span> <span style="color: #004080;">sequence</span>
+ <span style="color: #0000FF;">(</span><span style="color: #000000;">pgm</span> <span style="color: #004080;">string</span><span style="color: #0000FF;">)</span><span style="color: #000000;">mung</span> <span style="color: #008080;">function</span>
+
+ <span style="color: #0000FF;">(</span><span style="color: #004600;">true</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"*"</span><span style="color: #0000FF;">,(</span><span style="color: #008000;">"*"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">""</span><span style="color: #0000FF;">,</span><span style="color: #000000;">3</span><span style="color: #0000FF;">,</span><span style="color: #000000;">7</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"       -&lt;&gt;{}@!       "</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">join_by</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">split</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">rip</span> <span style="color: #008080;">constant</span>
+ <span style="color: #0000FF;">(</span><span style="color: #004600;">true</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"*"</span><span style="color: #0000FF;">,(</span><span style="color: #008000;">"*"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">""</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">7</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"-,=][)("</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">join_by</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">split</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">nup</span> <span style="color: #008080;">constant</span>
+ <span style="color: #0000FF;">(</span><span style="color: #004600;">true</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"*"</span><span style="color: #0000FF;">,(</span><span style="color: #008000;">"*"</span><span style="color: #0000FF;">,</span><span style="color: #008000;">""</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #000000;">7</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"-,=[]()"</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">join_by</span><span style="color: #0000FF;">)</span><span style="color: #7060A8;">split</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">pun</span> <span style="color: #008080;">constant</span>
+ <span style="color: #008080;">js without</span>
+ <span style="color: #000000;">demo</span><span style="color: #0000FF;">\</span><span style="color: #000000;">rosetta</span><span style="color: #0000FF;">\</span><span style="color: #000000;">inverted_syntax</span><span style="color: #0000FF;">.</span><span style="color: #000000;">exw</span> <span style="color: #000080;font-style:italic;">--</span>
+<!--

Task/Inverted-syntax/Phix/inverted-syntax-2.phix

@@ -0,0 +1,20 @@
+(notonline)-->
+ <span style="color: #000080;font-style:italic;">-- demo\rosetta\inverted_syntax.exw</span>
+ <span style="color: #008080;">without</span> <span style="color: #008080;">js</span>
+ <span style="color: #008080;">constant</span> <span style="color: #000000;">pun</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">split</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">join_by</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"()[]=,-"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">7</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">""</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"*"</span><span style="color: #0000FF;">),</span><span style="color: #008000;">"*"</span><span style="color: #0000FF;">,</span><span style="color: #004600;">true</span><span style="color: #0000FF;">)</span>
+ <span style="color: #008080;">constant</span> <span style="color: #000000;">nup</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">split</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">join_by</span><span style="color: #0000FF;">(</span><span style="color: #008000;">")(][=,-"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">7</span><span style="color: #0000FF;">,</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">""</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"*"</span><span style="color: #0000FF;">),</span><span style="color: #008000;">"*"</span><span style="color: #0000FF;">,</span><span style="color: #004600;">true</span><span style="color: #0000FF;">)</span>
+ <span style="color: #008080;">constant</span> <span style="color: #000000;">rip</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">split</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">join_by</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"       &lt;&gt;{}@!-       "</span><span style="color: #0000FF;">,</span><span style="color: #000000;">7</span><span style="color: #0000FF;">,</span><span style="color: #000000;">3</span><span style="color: #0000FF;">,</span><span style="color: #008000;">""</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"*"</span><span style="color: #0000FF;">),</span><span style="color: #008000;">"*"</span><span style="color: #0000FF;">,</span><span style="color: #004600;">true</span><span style="color: #0000FF;">)</span>
+
+ <span style="color: #008080;">function</span> <span style="color: #000000;">mung</span><span style="color: #0000FF;">(</span><span style="color: #004080;">string</span> <span style="color: #000000;">pgm</span><span style="color: #0000FF;">)</span>
+     <span style="color: #004080;">sequence</span> <span style="color: #000000;">lines</span><span style="color: #0000FF;">=</span><span style="color: #7060A8;">reverse</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">split</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">substitute_all</span><span style="color: #0000FF;">(</span><span style="color: #000000;">pgm</span><span style="color: #0000FF;">,</span><span style="color: #000000;">pun</span><span style="color: #0000FF;">,</span><span style="color: #000000;">rip</span><span style="color: #0000FF;">),</span><span style="color: #008000;">"\r\n"</span><span style="color: #0000FF;">))</span>
+     <span style="color: #008080;">for</span> <span style="color: #000000;">i</span><span style="color: #0000FF;">=</span><span style="color: #000000;">1</span> <span style="color: #008080;">to</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">lines</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">do</span> <span style="color: #000000;">lines</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">substitute_all</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">join</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">reverse</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">split</span><span style="color: #0000FF;">(</span><span style="color: #000000;">lines</span><span style="color: #0000FF;">[</span><span style="color: #000000;">i</span><span style="color: #0000FF;">]))),</span><span style="color: #000000;">rip</span><span style="color: #0000FF;">,</span><span style="color: #000000;">nup</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">end</span> <span style="color: #008080;">for</span>
+     <span style="color: #008080;">return</span> <span style="color: #7060A8;">join</span><span style="color: #0000FF;">(</span><span style="color: #000000;">lines</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"\n"</span><span style="color: #0000FF;">)</span>
+ <span style="color: #008080;">end</span> <span style="color: #008080;">function</span>
+ <span style="color: #004080;">sequence</span> <span style="color: #000000;">cl</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">command_line</span><span style="color: #0000FF;">()</span>
+ <span style="color: #004080;">string</span> <span style="color: #000000;">pgm</span> <span style="color: #0000FF;">=</span> <span style="color: #7060A8;">get_text</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cl</span><span style="color: #0000FF;">[$])</span>
+ <span style="color: #008080;">include</span> <span style="color: #000000;">write_file</span><span style="color: #0000FF;">.</span><span style="color: #000000;">e</span>
+ <span style="color: #0000FF;">{}</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">write_file</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"test.exw"</span><span style="color: #0000FF;">,</span><span style="color: #000000;">mung</span><span style="color: #0000FF;">(</span><span style="color: #000000;">pgm</span><span style="color: #0000FF;">)&</span><span style="color: #008000;">"\n"</span><span style="color: #0000FF;">)</span>
+ <span style="color: #008080;">if</span> <span style="color: #7060A8;">length</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cl</span><span style="color: #0000FF;">)></span><span style="color: #000000;">2</span> <span style="color: #008080;">then</span>
+     <span style="color: #7060A8;">system</span><span style="color: #0000FF;">(</span><span style="color: #000000;">cl</span><span style="color: #0000FF;">[</span><span style="color: #000000;">1</span><span style="color: #0000FF;">]&</span><span style="color: #008000;">"test.exw"</span><span style="color: #0000FF;">)</span>
+ <span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
+<!--

Task/Inverted-syntax/PicoLisp/inverted-syntax.l

@@ -0,0 +1,2 @@
+(de rv Prg
+   (append (last Prg) (head -1 Prg)) )

Task/Inverted-syntax/PowerShell/inverted-syntax-1.psh

@@ -0,0 +1 @@
+if ((Get-Date 5/27/2016).DayOfWeek -eq "Friday") {"Thank God it's Friday!"}

Task/Inverted-syntax/PowerShell/inverted-syntax-2.psh

@@ -0,0 +1,8 @@
+function Action ([scriptblock]$Expression, [Alias("if")][bool]$Test)
+{
+    if ($Test) {&$Expression}
+}
+
+Set-Alias -Name say -Value Action
+
+say {"Thank God it's Friday!"} -if (Get-Date 5/27/2016).DayOfWeek -eq "Friday"

Task/Inverted-syntax/Prolog/inverted-syntax.pro

@@ -0,0 +1,7 @@
+% Dracula is a vampire.
+% Also, you become a vampire if someone who is a vampire bites you.
+vampire(dracula).
+vampire(You) :- bites(Someone, You), vampire(Someone).
+
+% Oh no! Dracula just bit Bob...
+bites(dracula, bob).

Task/Inverted-syntax/Python/inverted-syntax-1.py

@@ -0,0 +1 @@
+x = truevalue if condition else falsevalue

Task/Inverted-syntax/Python/inverted-syntax-2.py

@@ -0,0 +1,2 @@
+with open("file.txt") as f:
+    something(f)

Task/Inverted-syntax/Qi/inverted-syntax.qi

@@ -0,0 +1,27 @@
+(define set-needumbrella
+  Raining -> (set needumbrella true) where (= true Raining)
+  Raining -> (set needumbrella false) where (= false Raining))
+
+(define set-needumbrella
+  Raining -> (if (= true Raining)
+                 (set needumbrella true)
+                 (set needumbrella false)))
+
+
+Alternatives:
+
+(define set-needumbrella
+  Raining -> (set needumbrella true) where Raining
+  Raining -> (set needumbrella false))
+
+(define set-needumbrella
+  Raining -> (if Raining
+                 (set needumbrella true)
+                 (set needumbrella false)))
+
+(define set-needumbrella
+  true  -> (set needumbrella true)
+  false -> (set needumbrella false))
+
+(define set-needumbrella
+  A -> (set needumbrella A))

Task/Inverted-syntax/R/inverted-syntax-1.r

@@ -0,0 +1 @@
+do.if <- function(expr, cond) if(cond) expr

Task/Inverted-syntax/R/inverted-syntax-2.r

@@ -0,0 +1 @@
+do.if(print("Wow! Lucky Guess!"), guess==6)

Task/Inverted-syntax/R/inverted-syntax-3.r

@@ -0,0 +1,3 @@
+`%if%` <- function(expr, cond) if(cond) expr
+
+print("Wow! Lucky Guess!") %if% (guess==6)

Task/Inverted-syntax/REXX/inverted-syntax.rexx

@@ -0,0 +1,10 @@
+/*REXX program demonstrates a use of a special case of inverted syntax  (via SIGNAL ON).*/
+signal on syntax
+a=7
+zz=444 / (7-a)
+return zz
+/*──────────────────────────────────────────────────────────────────────────────────────*/
+syntax:  say  '***error***  program is attempting to do division by zero,'
+         say  'the REXX statement number is: '  sigL  " and the REXX source is:"
+         say  sourceLine(sigL)
+         exit 13

Task/Inverted-syntax/Racket/inverted-syntax.rkt

@@ -0,0 +1,7 @@
+#lang racket
+(when #t (displayln "true"))
+((displayln "true") . when . #t)
+
+(define a 6)
+(set! a 5)
+(a . set! . 6)

Task/Inverted-syntax/Raku/inverted-syntax-1.raku

@@ -0,0 +1,4 @@
+if $guess == 6 { say "Wow! Lucky Guess!" }          # Traditional
+say 'Wow! Lucky Guess!' if $guess == 6;             # Inverted
+unless $guess == 6 { say "Huh! You Guessed Rong!" } # Traditional
+say 'Huh! You Guessed Rong!' unless $guess == 6;    # Inverted

Task/Inverted-syntax/Raku/inverted-syntax-2.raku

@@ -0,0 +1,8 @@
+while $i { --$i }
+--$i while $i;
+
+until $x > 10 { $x++ }
+$x++ until $x > 10;
+
+for 1..10 { .say if $_ %% 2 }
+.say if $_ %% 2 for 1..10;  # list comprehension

Task/Inverted-syntax/Raku/inverted-syntax-3.raku

@@ -0,0 +1 @@
+42 R= $_; say $_;   # prints 42

Task/Inverted-syntax/Raku/inverted-syntax-4.raku

@@ -0,0 +1,2 @@
+my @a = 1,2,3;
+(1,2,3) R= my @a;

Task/Inverted-syntax/Raku/inverted-syntax-5.raku

@@ -0,0 +1,2 @@
+my @a <== 1,2,3;
+1,2,3 ==> my @a;

Task/Inverted-syntax/Raku/inverted-syntax-6.raku

@@ -0,0 +1,7 @@
+repeat {
+    $_ = prompt "Gimme a number: ";
+} until /^\d+$/;
+
+repeat until /^\d+$/ {
+    $_ = prompt "Gimme a number: ";
+}

Task/Inverted-syntax/Raku/inverted-syntax-7.raku

@@ -0,0 +1,3 @@
+repeat until my $answer ~~ 42 {
+    $answer = prompt "Gimme an answer: ";
+}

Task/Inverted-syntax/Raku/inverted-syntax-8.raku

@@ -0,0 +1,4 @@
+my $answer;
+repeat {
+    $answer = prompt "Gimme an answer: ";
+} until $answer ~~ 42;

Task/Inverted-syntax/Ruby/inverted-syntax.rb

@@ -0,0 +1,15 @@
+# Raise ArgumentError if n is negative.
+if n < 0 then raise ArgumentError, "negative n" end
+raise ArgumentError, "negative n" if n < 0
+
+# Exit 1 unless we can call Process.fork.
+unless Process.respond_to? :fork then exit 1 end
+exit 1 unless Process.respond_to? :fork
+
+# Empty an array, printing each element.
+while ary.length > 0 do puts ary.shift end
+puts ary.shift while ary.length > 0
+
+# Another way to empty an array, printing each element.
+until ary.empty? do puts ary.shift end
+puts ary.shift until ary.empty?

Task/Inverted-syntax/Scala/inverted-syntax.scala

@@ -0,0 +1,6 @@
+object Main extends App {
+
+  val raining = true
+  val needUmbrella = raining
+  println(s"Do I need an umbrella?  ${if (needUmbrella) "Yes" else "No"}")
+}

Task/Inverted-syntax/Sidef/inverted-syntax.sidef

@@ -0,0 +1,8 @@
+# Inverted syntax with assignment
+var raining = true;
+[false]»(\var needumbrella);
+
+# Inverted syntax with conditional expressions
+if (raining==true) {needumbrella=true};
+{needumbrella=true} -> if (raining==true);
+(needumbrella=true) if (raining==true);

Task/Inverted-syntax/Swift/inverted-syntax.swift

@@ -0,0 +1,29 @@
+infix operator ~= {}
+infix operator ! {}
+
+func ~=(lhs:Int, inout rhs:Int) {
+    rhs = lhs
+}
+
+func !(lhs:(() -> Void), rhs:Bool) {
+    if (rhs) {
+        lhs()
+    }
+}
+
+// Traditional assignment
+var a = 0
+
+// Inverted using a custom operator
+20 ~= a
+
+let raining = true
+let tornado = true
+var needUmbrella = false
+var stayInside = false
+
+// Traditional conditional expression
+if raining {needUmbrella = true}
+
+// Inverted using a custom operator
+_ = {stayInside = true} ! tornado

Task/Inverted-syntax/TI-83-BASIC/inverted-syntax.basic

@@ -0,0 +1 @@
+536→N

Task/Inverted-syntax/Tcl/inverted-syntax-1.tcl

@@ -0,0 +1,84 @@
+# do.tcl --
+#
+#        Tcl implementation of a "do ... while|until" loop.
+#
+# Originally written for the "Texas Tcl Shootout" programming contest
+# at the 2000 Tcl Conference in Austin/Texas.
+#
+# Copyright (c) 2001 by Reinhard Max <Reinhard.Max@gmx.de>
+#
+# See the file "license.terms" for information on usage and redistribution
+# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
+#
+# RCS: @(#) $Id: do.tcl,v 1.6 2004/01/15 06:36:12 andreas_kupries Exp $
+#
+namespace eval ::control {
+
+    proc do {body args} {
+
+	#
+	# Implements a "do body while|until test" loop
+	#
+	# It is almost as fast as builtin "while" command for loops with
+	# more than just a few iterations.
+	#
+
+	set len [llength $args]
+	if {$len !=2 && $len != 0} {
+	    set proc [namespace current]::[lindex [info level 0] 0]
+	    return -code error "wrong # args: should be \"$proc body\" or \"$proc body \[until|while\] test\""
+	}
+	set test 0
+	foreach {whileOrUntil test} $args {
+	    switch -exact -- $whileOrUntil {
+		"while" {}
+		"until" { set test !($test) }
+		default {
+		    return -code error \
+			"bad option \"$whileOrUntil\": must be until, or while"
+		}
+	    }
+	    break
+	}
+
+	# the first invocation of the body
+	set code [catch { uplevel 1 $body } result]
+
+	# decide what to do upon the return code:
+	#
+	#               0 - the body executed successfully
+	#               1 - the body raised an error
+	#               2 - the body invoked [return]
+	#               3 - the body invoked [break]
+	#               4 - the body invoked [continue]
+	# everything else - return and pass on the results
+	#
+	switch -exact -- $code {
+	    0 {}
+	    1 {
+		return -errorinfo [ErrorInfoAsCaller uplevel do]  \
+		    -errorcode $::errorCode -code error $result
+	    }
+	    3 {
+		# FRINK: nocheck
+		return
+	    }
+	    4 {}
+	    default {
+		return -code $code $result
+	    }
+	}
+	# the rest of the loop
+	set code [catch {uplevel 1 [list while $test $body]} result]
+	if {$code == 1} {
+	    return -errorinfo [ErrorInfoAsCaller while do] \
+		-errorcode $::errorCode -code error $result
+	}
+	return -code $code $result
+	
+    }
+}
+
+#usage:
+package require control
+control::do {set i 0; puts "hello world"; incr i} until {$i > 0}

Task/Inverted-syntax/Tcl/inverted-syntax-2.tcl

@@ -0,0 +1,12 @@
+rename unknown __unknown
+proc unknown {args} {
+   if {3 == [llength $args]} {
+      package require control
+      return [control::do {*}$args]
+   } else {
+      return [__unknown {*}$args]
+   }
+}
+#usage
+% {set i 0; puts "hello world"; incr i} until {$i > 0}
+hello world

Task/Inverted-syntax/Wortel/inverted-syntax.wortel

@@ -0,0 +1,8 @@
+; a = expr
+:a expr
+; expr = a
+~:expr a
+; if cond expr
+@if cond expr
+; if expr cond
+~@if expr cond

Task/Inverted-syntax/Wren/inverted-syntax.wren

@@ -0,0 +1,22 @@
+class IBool {
+    construct new(b) {
+        if (!(b is Bool)) Fiber.abort("B must be a boolean")
+        _b = b
+    }
+
+    iff(cond) { cond ? _b : !_b }
+}
+
+var itrue = IBool.new(true)
+
+var needUmbrella
+var raining = true
+
+// normal syntax
+if (raining) needUmbrella = true
+System.print("Is it raining? %(raining). Do I need an umbrella? %(needUmbrella)")
+
+// inverted syntax
+raining = false
+needUmbrella = itrue.iff(raining)
+System.print("Is it raining? %(raining). Do I need an umbrella? %(needUmbrella)")

Task/Inverted-syntax/Z80-Assembly/inverted-syntax.z80

@@ -0,0 +1,2 @@
+byte &EF,&BE
+word &BEEF

Task/Inverted-syntax/Zkl/inverted-syntax-1.zkl

@@ -0,0 +1,2 @@
+if (raining==True) needumbrella:=True;
+(raining==True) : if (_) needumbrella:=True;

Task/Inverted-syntax/Zkl/inverted-syntax-2.zkl

@@ -0,0 +1,2 @@
+a := 6
+6 : a:=_

Task/Inverted-syntax/Zkl/inverted-syntax-3.zkl

@@ -0,0 +1,2 @@
+key.sort(fcn(kv,kv2){kv[0] < kv2[0]}) : listUnzip(_) :
+D.SD((_).xplode()) : return(_);