added functional equivalence. Added element, define, modulo, exponent, match, assign, append, swap, opposite, identity, not, unpack,

src/main/java/carpet/script/Expression.java

@@ -111,12 +111,20 @@ public class Expression
     }
 
     private final Map<String, String> functionalEquivalence = new Object2ObjectOpenHashMap<>();
+    private final Map<String, String> functionalAliases = new Object2ObjectOpenHashMap<>();
 
-    public void addFunctionalEquivalence(String operator, String function)
+    private void addFunctionalEquivalence(String operator, String function)
     {
         assert operators.containsKey(operator);
         assert functions.containsKey(function);
         functionalEquivalence.put(operator, function);
+        functionalAliases.put(operator, function);
+    }
+    private void addFunctionalAlias(String operator, String function)
+    {
+        assert operators.containsKey(operator);
+        assert functions.containsKey(function);
+        functionalAliases.put(operator, function);
     }
 
     private final Map<String, Value> constants = Map.of(
@@ -191,7 +199,7 @@ public class Expression
     }
 
 
-    public void addLazyUnaryOperator(String surface, int precedence, boolean leftAssoc, boolean pure, Function<Context.Type, Context.Type> staticTyper,
+    public void addLazyUnaryOperator(String surface, String function, int precedence, boolean leftAssoc, boolean pure, Function<Context.Type, Context.Type> staticTyper,
                                      TriFunction<Context, Context.Type, LazyValue, LazyValue> lazyfun)
     {
         operators.put(surface + "u", new AbstractLazyOperator(precedence, leftAssoc)
@@ -227,10 +235,45 @@ public class Expression
                 }
             }
         });
+
+        functions.put(function, new AbstractLazyFunction(1, function)
+        {
+            @Override
+            public boolean pure()
+            {
+                return pure;
+            }
+
+            @Override
+            public boolean transitive()
+            {
+                return false;
+            }
+
+            @Override
+            public Context.Type staticType(Context.Type outerType)
+            {
+                return staticTyper.apply(outerType);
+            }
+
+            @Override
+            public LazyValue lazyEval(Context c, Context.Type t, Expression e, Token token, List<LazyValue> v)
+            {
+                try
+                {
+                    return lazyfun.apply(c, t, v.get(0));
+                }
+                catch (RuntimeException exc)
+                {
+                    throw handleCodeException(c, exc, e, token);
+                }
+            }
+        });
+        addFunctionalAlias(surface + "u", function);
     }
 
 
-    public void addLazyBinaryOperatorWithDelegation(String surface, int precedence, boolean leftAssoc, boolean pure,
+    public void addLazyBinaryOperatorWithDelegation(String surface, String function, int precedence, boolean leftAssoc, boolean pure,
                                                     SexFunction<Context, Context.Type, Expression, Token, LazyValue, LazyValue, LazyValue> lazyfun)
     {
         operators.put(surface, new AbstractLazyOperator(precedence, leftAssoc)
@@ -260,6 +303,36 @@ public class Expression
                 }
             }
         });
+
+        functions.put(function, new AbstractLazyFunction(2, function)
+        {
+            @Override
+            public boolean pure()
+            {
+                return pure;
+            }
+
+            @Override
+            public boolean transitive()
+            {
+                return false;
+            }
+
+            @Override
+            public LazyValue lazyEval(Context c, Context.Type type, Expression e, Token t, List<LazyValue> v)
+            {
+                try
+                {
+                    return lazyfun.apply(c, type, e, t, v.get(0), v.get(1));
+                }
+                catch (RuntimeException exc)
+                {
+                    throw handleCodeException(c, exc, e, t);
+                }
+            }
+        });
+
+        addFunctionalAlias(surface, function);
     }
 
     public void addCustomFunction(String name, ILazyFunction fun)
@@ -333,7 +406,84 @@ public class Expression
         });
     }
 
-    public void addLazyBinaryOperator(String surface, int precedence, boolean leftAssoc, boolean pure, Function<Context.Type, Context.Type> typer,
+    public void addLazyBinaryOperator(String surface, String function, int precedence, boolean leftAssoc, boolean pure, Function<Context.Type, Context.Type> typer,
+                                      QuadFunction<Context, Context.Type, LazyValue, LazyValue, LazyValue> lazyfun, TriFunction<Context, Context.Type, List<LazyValue>, LazyValue> multiFun)
+    {
+        operators.put(surface, new AbstractLazyOperator(precedence, leftAssoc)
+        {
+
+            @Override
+            public boolean pure()
+            {
+                return pure;
+            }
+
+            @Override
+            public boolean transitive()
+            {
+                return false;
+            }
+
+            @Override
+            public Context.Type staticType(Context.Type outerType)
+            {
+                return typer.apply(outerType);
+            }
+
+            @Override
+            public LazyValue lazyEval(Context c, Context.Type t, Expression e, Token token, LazyValue v1, LazyValue v2)
+            {
+                ILazyFunction.checkInterrupts();
+                try
+                {
+                    return lazyfun.apply(c, t, v1, v2);
+                }
+                catch (RuntimeException exc)
+                {
+                    throw handleCodeException(c, exc, e, token);
+                }
+            }
+        });
+
+        functions.put(function, new AbstractLazyFunction(-1, function)
+        {
+            @Override
+            public boolean pure()
+            {
+                return true;
+            }
+
+            @Override
+            public boolean transitive()
+            {
+                return false;
+            }
+
+            @Override
+            public Context.Type staticType(Context.Type outerType)
+            {
+                return typer.apply(outerType);
+            }
+
+            @Override
+            public LazyValue lazyEval(Context c, Context.Type i, Expression e, Token t, List<LazyValue> lazyParams)
+            {
+                ILazyFunction.checkInterrupts();
+                try
+                {
+                    return multiFun.apply(c, i, lazyParams);
+                }
+                catch (RuntimeException exc)
+                {
+                    throw handleCodeException(c, exc, e, t);
+                }
+            }
+        });
+
+        addFunctionalEquivalence(surface, function);
+    }
+
+    public void addLazyBinaryOperator(String surface, String function, int precedence, boolean leftAssoc, boolean pure, Function<Context.Type, Context.Type> typer,
                                       QuadFunction<Context, Context.Type, LazyValue, LazyValue, LazyValue> lazyfun)
     {
         operators.put(surface, new AbstractLazyOperator(precedence, leftAssoc)
@@ -371,9 +521,45 @@ public class Expression
                 }
             }
         });
+
+        functions.put(function, new AbstractLazyFunction(2, function)
+        {
+            @Override
+            public boolean pure()
+            {
+                return pure;
+            }
+
+            @Override
+            public boolean transitive()
+            {
+                return false;
+            }
+
+            @Override
+            public Context.Type staticType(Context.Type outerType)
+            {
+                return typer.apply(outerType);
+            }
+
+            @Override
+            public LazyValue lazyEval(Context c, Context.Type t, Expression e, Token token, List<LazyValue> v)
+            {
+                try
+                {
+                    return lazyfun.apply(c, t, v.get(0), v.get(1));
+                }
+                catch (RuntimeException exc)
+                {
+                    throw handleCodeException(c, exc, e, token);
+                }
+            }
+        });
+
+        addFunctionalAlias(surface, function);
     }
 
-    public void addBinaryContextOperator(String surface, int precedence, boolean leftAssoc, boolean pure, boolean transitive,
+    public void addBinaryContextOperator(String surface, String function, int precedence, boolean leftAssoc, boolean pure, boolean transitive,
                                          QuadFunction<Context, Context.Type, Value, Value, Value> fun)
     {
         operators.put(surface, new AbstractLazyOperator(precedence, leftAssoc)
@@ -404,6 +590,37 @@ public class Expression
                 }
             }
         });
+
+        functions.put(function, new AbstractLazyFunction(2, function)
+        {
+            @Override
+            public boolean pure()
+            {
+                return pure;
+            }
+
+            @Override
+            public boolean transitive()
+            {
+                return transitive;
+            }
+
+            @Override
+            public LazyValue lazyEval(Context c, Context.Type t, Expression e, Token token, List<LazyValue> v)
+            {
+                try
+                {
+                    Value ret = fun.apply(c, t, v.get(0).evalValue(c, Context.NONE), v.get(1).evalValue(c, Context.NONE));
+                    return (cc, tt) -> ret;
+                }
+                catch (RuntimeException exc)
+                {
+                    throw handleCodeException(c, exc, e, token);
+                }
+            }
+        });
+
+        addFunctionalAlias(surface, function);
     }
 
     public static RuntimeException handleCodeException(Context c, RuntimeException exc, Expression e, Token token)
@@ -433,7 +650,7 @@ public class Expression
         return new ExpressionException(c, e, token, "Internal error (please report this issue to Carpet) while evaluating: " + exc);
     }
 
-    public void addUnaryOperator(String surface, boolean leftAssoc, Function<Value, Value> fun)
+    public void addUnaryOperator(String surface, String function, boolean leftAssoc, Function<Value, Value> fun)
     {
         operators.put(surface + "u", new AbstractUnaryOperator(Operators.precedence.get("unary+-!..."), leftAssoc)
         {
@@ -443,18 +660,57 @@ public class Expression
                 return fun.apply(v1);
             }
         });
+        functions.put(function, new AbstractFunction(1, function)
+        {
+            @Override
+            public Value eval(List<Value> v1)
+            {
+                return fun.apply(v1.get(0));
+            }
+        });
+        addFunctionalAlias(surface + "u", function);
     }
 
-    public void addBinaryOperator(String surface, int precedence, boolean leftAssoc, BiFunction<Value, Value, Value> fun)
+    public void addBinaryOperator(String surface, String function, int precedence, boolean leftAssoc, BiFunction<Value, Value, Value> fun, Function<List<Value>, Value> multiFun)
     {
         operators.put(surface, new AbstractOperator(precedence, leftAssoc)
         {
             @Override
-            public Value eval(Value v1, Value v2)
-            {
+            public Value eval(Value v1, Value v2) {
                 return fun.apply(v1, v2);
             }
         });
+
+        functions.put(function, new AbstractFunction(-1, function)
+        {
+            @Override
+            public Value eval(List<Value> parameters)
+            {
+                return multiFun.apply(parameters);
+            }
+        });
+        addFunctionalEquivalence(surface, function);
+    }
+
+    public void addBinaryOperator(String surface, String name, int precedence, boolean leftAssoc, BiFunction<Value, Value, Value> fun)
+    {
+        operators.put(surface, new AbstractOperator(precedence, leftAssoc)
+        {
+            @Override
+            public Value eval(Value v1, Value v2) {
+                return fun.apply(v1, v2);
+            }
+        });
+        functions.put(name, new AbstractFunction(2, name)
+        {
+            @Override
+            public Value eval(List<Value> parameters)
+            {
+                return fun.apply(parameters.get(0), parameters.get(1));
+            }
+        });
+
+        addFunctionalAlias(surface, name);
     }
 
 
@@ -623,44 +879,6 @@ public class Expression
         });
     }
 
-    public void addPureLazyFunction(String name, int num_params, Function<Context.Type, Context.Type> typer, TriFunction<Context, Context.Type, List<LazyValue>, LazyValue> fun)
-    {
-        functions.put(name, new AbstractLazyFunction(num_params, name)
-        {
-            @Override
-            public boolean pure()
-            {
-                return true;
-            }
-
-            @Override
-            public boolean transitive()
-            {
-                return false;
-            }
-
-            @Override
-            public Context.Type staticType(Context.Type outerType)
-            {
-                return typer.apply(outerType);
-            }
-
-            @Override
-            public LazyValue lazyEval(Context c, Context.Type i, Expression e, Token t, List<LazyValue> lazyParams)
-            {
-                ILazyFunction.checkInterrupts();
-                try
-                {
-                    return fun.apply(c, i, lazyParams);
-                }
-                catch (RuntimeException exc)
-                {
-                    throw handleCodeException(c, exc, e, t);
-                }
-            }
-        });
-    }
-
     public void addContextFunction(String name, int num_params, TriFunction<Context, Context.Type, List<Value>, Value> fun)
     {
         functions.put(name, new AbstractLazyFunction(num_params, name)
@@ -859,6 +1077,9 @@ public class Expression
         Threading.apply(this);
         Loops.apply(this);
         DataStructures.apply(this);
+        for(String op : operators.keySet()) {
+            assert functionalAliases.containsKey(op) : "Missing function for operator " + op;
+        }
     }
 
 
@@ -1381,6 +1602,13 @@ public class Expression
                 }
             }
         }
+
+        if (toFunctional && functionalAliases.containsKey(symbol) && !node.args.isEmpty())
+        {
+            optimized = true;
+            node.token.morph(Token.TokenType.FUNCTION, functionalAliases.get(symbol));
+        }
+
         return optimized;
     }
 

src/main/java/carpet/script/language/ControlFlow.java

@@ -22,14 +22,12 @@ public class ControlFlow
     public static void apply(Expression expression) // public just to get the javadoc right
     {
         // needs to be lazy cause of custom contextualization
-        expression.addLazyBinaryOperator(";", Operators.precedence.get("nextop;"), true, true, t -> Context.Type.VOID, (c, t, lv1, lv2) ->
+        expression.addLazyBinaryOperator(";", "then", Operators.precedence.get("nextop;"), true, true, t -> Context.Type.VOID, (c, t, lv1, lv2) ->
         {
             lv1.evalValue(c, Context.VOID);
             Value v2 = lv2.evalValue(c, t);
             return (cc, tt) -> v2;
-        });
-
-        expression.addPureLazyFunction("then", -1, t -> Context.Type.VOID, (c, t, lv) -> {
+        }, (c, t, lv) -> {
             int imax = lv.size() - 1;
             for (int i = 0; i < imax; i++)
             {
@@ -38,7 +36,6 @@ public class ControlFlow
             Value v = lv.get(imax).evalValue(c, t);
             return (cc, tt) -> v;
         });
-        expression.addFunctionalEquivalence(";", "then");
 
 
         // obvious lazy due to conditional evaluation of arguments

src/main/java/carpet/script/language/DataStructures.java

@@ -188,7 +188,7 @@ public class DataStructures
                         ? ListValue.wrap(map.getMap().entrySet().stream().map(p -> ListValue.of(p.getKey(), p.getValue())))
                         : Value.NULL);
 
-        expression.addBinaryContextOperator(":", Operators.precedence.get("attribute~:"), true, true, false, (ctx, t, container, address) ->
+        expression.addBinaryContextOperator(":", "element",  Operators.precedence.get("attribute~:"), true, true, false, (ctx, t, container, address) ->
         {
             if (container instanceof final LContainerValue lcv)
             {

src/main/java/carpet/script/language/Functions.java

@@ -126,7 +126,7 @@ public class Functions
 
         //assigns const procedure to the lhs, returning its previous value
         // must be lazy due to RHS being an expression to save to execute
-        expression.addLazyBinaryOperatorWithDelegation("->", Operators.precedence.get("def->"), false, false, (c, type, e, t, lv1, lv2) ->
+        expression.addLazyBinaryOperatorWithDelegation("->", "define", Operators.precedence.get("def->"), false, false, (c, type, e, t, lv1, lv2) ->
         {
             if (type == Context.MAPDEF)
             {

src/main/java/carpet/script/language/Operators.java

@@ -41,8 +41,7 @@ public class Operators
 
     public static void apply(Expression expression)
     {
-        expression.addBinaryOperator("+", precedence.get("addition+-"), true, Value::add);
-        expression.addFunction("sum", lv -> {
+        expression.addBinaryOperator("+", "sum", precedence.get("addition+-"), true, Value::add, lv -> {
             int size = lv.size();
             if (size == 0)
             {
@@ -55,10 +54,8 @@ public class Operators
             }
             return accumulator;
         });
-        expression.addFunctionalEquivalence("+", "sum");
 
-        expression.addBinaryOperator("-", precedence.get("addition+-"), true, Value::subtract);
-        expression.addFunction("difference", lv -> {
+        expression.addBinaryOperator("-", "difference", precedence.get("addition+-"), true, Value::subtract, lv -> {
             int size = lv.size();
             if (size == 0)
             {
@@ -71,10 +68,8 @@ public class Operators
             }
             return accumulator;
         });
-        expression.addFunctionalEquivalence("-", "difference");
 
-        expression.addBinaryOperator("*", precedence.get("multiplication*/%"), true, Value::multiply);
-        expression.addFunction("product", lv -> {
+        expression.addBinaryOperator("*", "product", precedence.get("multiplication*/%"), true, Value::multiply, lv -> {
             int size = lv.size();
             if (size == 0)
             {
@@ -87,10 +82,8 @@ public class Operators
             }
             return accumulator;
         });
-        expression.addFunctionalEquivalence("*", "product");
 
-        expression.addBinaryOperator("/", precedence.get("multiplication*/%"), true, Value::divide);
-        expression.addFunction("quotient", lv -> {
+        expression.addBinaryOperator("/", "quotient", precedence.get("multiplication*/%"), true, Value::divide, lv -> {
             int size = lv.size();
             if (size == 0)
             {
@@ -103,11 +96,11 @@ public class Operators
             }
             return accumulator;
         });
-        expression.addFunctionalEquivalence("/", "quotient");
 
-        expression.addBinaryOperator("%", precedence.get("multiplication*/%"), true, (v1, v2) ->
+        expression.addBinaryOperator("%", "modulo", precedence.get("multiplication*/%"), true, (v1, v2) ->
                 NumericValue.asNumber(v1).mod(NumericValue.asNumber(v2)));
-        expression.addBinaryOperator("^", precedence.get("exponent^"), false, (v1, v2) ->
+
+        expression.addBinaryOperator("^", "exponent", precedence.get("exponent^"), false, (v1, v2) ->
                 new NumericValue(java.lang.Math.pow(NumericValue.asNumber(v1).getDouble(), NumericValue.asNumber(v2).getDouble())));
 
         expression.addFunction("bitwise_and", lv -> {
@@ -153,13 +146,11 @@ public class Operators
         });
 
         // lazy cause RHS is only conditional
-        expression.addLazyBinaryOperator("&&", precedence.get("and&&"), false, true, t -> Context.Type.BOOLEAN, (c, t, lv1, lv2) ->
+        expression.addLazyBinaryOperator("&&", "and", precedence.get("and&&"), false, true, t -> Context.Type.BOOLEAN, (c, t, lv1, lv2) ->
         { // todo check how is optimizations going
             Value v1 = lv1.evalValue(c, Context.BOOLEAN);
             return v1.getBoolean() ? lv2 : ((cc, tt) -> v1);
-        });
-
-        expression.addPureLazyFunction("and", -1, t -> Context.Type.BOOLEAN, (c, t, lv) -> {
+        }, (c, t, lv) -> {
             int last = lv.size() - 1;
             if (last == -1)
             {
@@ -168,7 +159,7 @@ public class Operators
             for (LazyValue l : lv.subList(0, last))
             {
                 Value val = l.evalValue(c, Context.Type.BOOLEAN);
-                if (val instanceof final FunctionUnpackedArgumentsValue fuav)
+                if (val instanceof FunctionUnpackedArgumentsValue fuav)
                 {
                     for (Value it : fuav)
                     {
@@ -188,16 +179,13 @@ public class Operators
             }
             return lv.get(last);
         });
-        expression.addFunctionalEquivalence("&&", "and");
 
         // lazy cause RHS is only conditional
-        expression.addLazyBinaryOperator("||", precedence.get("or||"), false, true, t -> Context.Type.BOOLEAN, (c, t, lv1, lv2) ->
+        expression.addLazyBinaryOperator("||", "or", precedence.get("or||"), false, true, t -> Context.Type.BOOLEAN, (c, t, lv1, lv2) ->
         {
             Value v1 = lv1.evalValue(c, Context.BOOLEAN);
             return v1.getBoolean() ? ((cc, tt) -> v1) : lv2;
-        });
-
-        expression.addPureLazyFunction("or", -1, t -> Context.Type.BOOLEAN, (c, t, lv) -> {
+        }, (c, t, lv) -> {
             int last = lv.size() - 1;
             if (last == -1)
             {
@@ -226,13 +214,10 @@ public class Operators
             }
             return lv.get(last);
         });
-        expression.addFunctionalEquivalence("||", "or");
 
-        expression.addBinaryOperator("~", precedence.get("attribute~:"), true, Value::in);
+        expression.addBinaryOperator("~", "match", precedence.get("attribute~:"), true, Value::in);
 
-        expression.addBinaryOperator(">", precedence.get("compare>=><=<"), false, (v1, v2) ->
-                BooleanValue.of(v1.compareTo(v2) > 0));
-        expression.addFunction("decreasing", lv -> {
+        expression.addBinaryOperator(">", "decreasing", precedence.get("compare>=><=<"), false, (v1, v2) -> BooleanValue.of(v1.compareTo(v2) > 0), lv -> {
             int size = lv.size();
             if (size < 2)
             {
@@ -249,11 +234,8 @@ public class Operators
             }
             return Value.TRUE;
         });
-        expression.addFunctionalEquivalence(">", "decreasing");
 
-        expression.addBinaryOperator(">=", precedence.get("compare>=><=<"), false, (v1, v2) ->
-                BooleanValue.of(v1.compareTo(v2) >= 0));
-        expression.addFunction("nonincreasing", lv -> {
+        expression.addBinaryOperator(">=", "nonincreasing", precedence.get("compare>=><=<"), false, (v1, v2) -> BooleanValue.of(v1.compareTo(v2) >= 0), lv -> {
             int size = lv.size();
             if (size < 2)
             {
@@ -270,11 +252,8 @@ public class Operators
             }
             return Value.TRUE;
         });
-        expression.addFunctionalEquivalence(">=", "nonincreasing");
 
-        expression.addBinaryOperator("<", precedence.get("compare>=><=<"), false, (v1, v2) ->
-                BooleanValue.of(v1.compareTo(v2) < 0));
-        expression.addFunction("increasing", lv -> {
+        expression.addBinaryOperator("<", "increasing", precedence.get("compare>=><=<"), false, (v1, v2) -> BooleanValue.of(v1.compareTo(v2) < 0), lv -> {
             int size = lv.size();
             if (size < 2)
             {
@@ -291,11 +270,8 @@ public class Operators
             }
             return Value.TRUE;
         });
-        expression.addFunctionalEquivalence("<", "increasing");
 
-        expression.addBinaryOperator("<=", precedence.get("compare>=><=<"), false, (v1, v2) ->
-                BooleanValue.of(v1.compareTo(v2) <= 0));
-        expression.addFunction("nondecreasing", lv -> {
+        expression.addBinaryOperator("<=", "nondecreasing", precedence.get("compare>=><=<"), false, (v1, v2) -> BooleanValue.of(v1.compareTo(v2) <= 0), lv -> {
             int size = lv.size();
             if (size < 2)
             {
@@ -312,7 +288,7 @@ public class Operators
             }
             return Value.TRUE;
         });
-        expression.addFunctionalEquivalence("<=", "nondecreasing");
+
         expression.addMathematicalBinaryIntFunction("bitwise_shift_left", (num, amount) -> num << amount);
         expression.addMathematicalBinaryIntFunction("bitwise_shift_right", (num, amount) -> num >>> amount);
         expression.addMathematicalBinaryIntFunction("bitwise_arithmetic_shift_right", (num, amount) -> num >> amount);
@@ -326,9 +302,7 @@ public class Operators
         expression.addMathematicalUnaryIntFunction("double_to_long_bits", Double::doubleToLongBits);
         expression.addUnaryFunction("long_to_double_bits", v ->
                 new NumericValue(Double.longBitsToDouble(NumericValue.asNumber(v).getLong())));
-        expression.addBinaryOperator("==", precedence.get("equal==!="), false, (v1, v2) ->
-                v1.equals(v2) ? Value.TRUE : Value.FALSE);
-        expression.addFunction("equal", lv -> {
+        expression.addBinaryOperator("==", "equal", precedence.get("equal==!="), false, (v1, v2) -> v1.equals(v2) ? Value.TRUE : Value.FALSE, lv -> {
             int size = lv.size();
             if (size < 2)
             {
@@ -345,11 +319,8 @@ public class Operators
             }
             return Value.TRUE;
         });
-        expression.addFunctionalEquivalence("==", "equal");
 
-        expression.addBinaryOperator("!=", precedence.get("equal==!="), false, (v1, v2) ->
-                v1.equals(v2) ? Value.FALSE : Value.TRUE);
-        expression.addFunction("unique", lv -> {
+        expression.addBinaryOperator("!=", "unique", precedence.get("equal==!="), false, (v1, v2) -> v1.equals(v2) ? Value.FALSE : Value.TRUE, lv -> {
             int size = lv.size();
             if (size < 2)
             {
@@ -368,10 +339,9 @@ public class Operators
             }
             return Value.TRUE;
         });
-        expression.addFunctionalEquivalence("!=", "unique");
 
         // lazy cause of assignment which is non-trivial
-        expression.addLazyBinaryOperator("=", precedence.get("assign=<>"), false, false, t -> Context.Type.LVALUE, (c, t, lv1, lv2) ->
+        expression.addLazyBinaryOperator("=", "assign", precedence.get("assign=<>"), false, false, t -> Context.Type.LVALUE, (c, t, lv1, lv2) ->
         {
             Value v1 = lv1.evalValue(c, Context.LVALUE);
             Value v2 = lv2.evalValue(c);
@@ -424,7 +394,7 @@ public class Operators
         });
 
         // lazy due to assignment
-        expression.addLazyBinaryOperator("+=", precedence.get("assign=<>"), false, false, t -> Context.Type.LVALUE, (c, t, lv1, lv2) ->
+        expression.addLazyBinaryOperator("+=", "append", precedence.get("assign=<>"), false, false, t -> Context.Type.LVALUE, (c, t, lv1, lv2) ->
         {
             Value v1 = lv1.evalValue(c, Context.LVALUE);
             Value v2 = lv2.evalValue(c);
@@ -493,7 +463,7 @@ public class Operators
             return boundedLHS;
         });
 
-        expression.addBinaryContextOperator("<>", precedence.get("assign=<>"), false, false, false, (c, t, v1, v2) ->
+        expression.addBinaryContextOperator("<>", "swap", precedence.get("assign=<>"), false, false, false, (c, t, v1, v2) ->
         {
             if (v1 instanceof final ListValue.ListConstructorValue lcv1 && v2 instanceof final ListValue.ListConstructorValue lcv2)
             {
@@ -541,17 +511,17 @@ public class Operators
             return lval;
         });
 
-        expression.addUnaryOperator("-", false, v -> NumericValue.asNumber(v).opposite());
+        expression.addUnaryOperator("-", "opposite", false, v -> NumericValue.asNumber(v).opposite());
 
-        expression.addUnaryOperator("+", false, NumericValue::asNumber);
+        expression.addUnaryOperator("+", "identity", false, NumericValue::asNumber);
 
         // could be non-lazy, but who cares - its a small one.
-        expression.addLazyUnaryOperator("!", precedence.get("unary+-!..."), false, true, x -> Context.Type.BOOLEAN, (c, t, lv) ->
+        expression.addLazyUnaryOperator("!", "not", precedence.get("unary+-!..."), false, true, x -> Context.Type.BOOLEAN, (c, t, lv) ->
                 lv.evalValue(c, Context.BOOLEAN).getBoolean() ? (cc, tt) -> Value.FALSE : (cc, tt) -> Value.TRUE
         ); // might need context boolean
 
         // lazy because of typed evaluation of the argument
-        expression.addLazyUnaryOperator("...", Operators.precedence.get("unary+-!..."), false, true, t -> t == Context.Type.LOCALIZATION ? Context.NONE : t, (c, t, lv) ->
+        expression.addLazyUnaryOperator("...", "unpack", Operators.precedence.get("unary+-!..."), false, true, t -> t == Context.Type.LOCALIZATION ? Context.NONE : t, (c, t, lv) ->
         {
             if (t == Context.LOCALIZATION)
             {