Расширенные исключения

src/com/annimon/ownlang/exceptions/ArgumentsMismatchException.java

@@ -0,0 +1,11 @@
+package com.annimon.ownlang.exceptions;
+
+public final class ArgumentsMismatchException extends RuntimeException {
+
+    public ArgumentsMismatchException() {
+    }
+
+    public ArgumentsMismatchException(String message) {
+        super(message);
+    }
+}

src/com/annimon/ownlang/exceptions/LexerException.java

@@ -1,4 +1,4 @@
-package com.annimon.ownlang.parser;
+package com.annimon.ownlang.exceptions;
 
 /**
  *

src/com/annimon/ownlang/exceptions/OperationIsNotSupportedException.java

@@ -0,0 +1,8 @@
+package com.annimon.ownlang.exceptions;
+
+public final class OperationIsNotSupportedException extends RuntimeException {
+
+    public OperationIsNotSupportedException(Object operation) {
+        super("Operation " + operation + " is not supported");
+    }
+}

src/com/annimon/ownlang/exceptions/ParseException.java

@@ -1,4 +1,4 @@
-package com.annimon.ownlang.parser;
+package com.annimon.ownlang.exceptions;
 
 /**
  *

src/com/annimon/ownlang/exceptions/PatternMatchingException.java

@@ -0,0 +1,11 @@
+package com.annimon.ownlang.exceptions;
+
+public final class PatternMatchingException extends RuntimeException {
+
+    public PatternMatchingException() {
+    }
+
+    public PatternMatchingException(String message) {
+        super(message);
+    }
+}

src/com/annimon/ownlang/exceptions/TypeException.java

@@ -0,0 +1,8 @@
+package com.annimon.ownlang.exceptions;
+
+public final class TypeException extends RuntimeException {
+
+    public TypeException(String message) {
+        super(message);
+    }
+}

src/com/annimon/ownlang/exceptions/UnknownFunctionException.java

@@ -0,0 +1,15 @@
+package com.annimon.ownlang.exceptions;
+
+public final class UnknownFunctionException extends RuntimeException {
+    
+    private final String functionName;
+
+    public UnknownFunctionException(String name) {
+        super("Unknown function " + name);
+        this.functionName = name;
+    }
+
+    public String getFunctionName() {
+        return functionName;
+    }
+}

src/com/annimon/ownlang/exceptions/VariableDoesNotExistsException.java

@@ -0,0 +1,15 @@
+package com.annimon.ownlang.exceptions;
+
+public final class VariableDoesNotExistsException extends RuntimeException {
+    
+    private final String variable;
+
+    public VariableDoesNotExistsException(String variable) {
+        super("Variable " + variable + " does not exists");
+        this.variable = variable;
+    }
+
+    public String getVariable() {
+        return variable;
+    }
+}

src/com/annimon/ownlang/lib/ArrayValue.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib;
 
+import com.annimon.ownlang.exceptions.TypeException;
 import java.util.Arrays;
 import java.util.Iterator;
 
@@ -61,7 +62,7 @@ public final class ArrayValue implements Value, Iterable<Value> {
     
     @Override
     public double asNumber() {
-        throw new RuntimeException("Cannot cast array to number");
+        throw new TypeException("Cannot cast array to number");
     }
 
     @Override

src/com/annimon/ownlang/lib/FunctionValue.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib;
 
+import com.annimon.ownlang.exceptions.TypeException;
 import java.util.Objects;
 
 /**
@@ -23,7 +24,7 @@ public final class FunctionValue implements Value {
     
     @Override
     public double asNumber() {
-        throw new RuntimeException("Cannot cast function to number");
+        throw new TypeException("Cannot cast function to number");
     }
 
     @Override

src/com/annimon/ownlang/lib/Functions.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib;
 
+import com.annimon.ownlang.exceptions.UnknownFunctionException;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -20,7 +21,7 @@ public final class Functions {
     }
     
     public static Function get(String key) {
-        if (!isExists(key)) throw new RuntimeException("Unknown function " + key);
+        if (!isExists(key)) throw new UnknownFunctionException(key);
         return functions.get(key);
     }
     

src/com/annimon/ownlang/lib/MapValue.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib;
 
+import com.annimon.ownlang.exceptions.TypeException;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
@@ -46,7 +47,7 @@ public class MapValue implements Value, Iterable<Map.Entry<Value, Value>> {
 
     @Override
     public double asNumber() {
-        throw new RuntimeException("Cannot cast map to number");
+        throw new TypeException("Cannot cast map to number");
     }
 
     @Override

src/com/annimon/ownlang/lib/UserDefinedFunction.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
 import com.annimon.ownlang.parser.ast.ReturnStatement;
 import com.annimon.ownlang.parser.ast.Statement;
 import java.util.List;
@@ -30,7 +31,7 @@ public final class UserDefinedFunction implements Function {
     @Override
     public Value execute(Value... values) {
         final int size = values.length;
-        if (size != getArgsCount()) throw new RuntimeException("Args count mismatch");
+        if (size != getArgsCount()) throw new ArgumentsMismatchException("Arguments count mismatch");
 
         try {
             Variables.push();

src/com/annimon/ownlang/lib/modules/canvas.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib.modules;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
 import com.annimon.ownlang.lib.*;
 import java.awt.Color;
 import java.awt.Dimension;
@@ -89,7 +90,7 @@ public final class canvas implements Module {
     
     private static Function intConsumer4Convert(IntConsumer4 consumer) {
         return args -> {
-            if (args.length != 4) throw new RuntimeException("Four args expected");
+            if (args.length != 4) throw new ArgumentsMismatchException("Four args expected");
             int x = (int) args[0].asNumber();
             int y = (int) args[1].asNumber();
             int w = (int) args[2].asNumber();
@@ -186,7 +187,7 @@ public final class canvas implements Module {
         
         @Override
         public Value execute(Value... args) {
-            if (args.length != 3) throw new RuntimeException("Three args expected");
+            if (args.length != 3) throw new ArgumentsMismatchException("Three args expected");
             int x = (int) args[1].asNumber();
             int y = (int) args[2].asNumber();
             graphics.drawString(args[0].asString(), x, y);

src/com/annimon/ownlang/lib/modules/functions/functional_combine.java

@@ -0,0 +1,55 @@
+package com.annimon.ownlang.lib.modules.functions;
+
+import com.annimon.ownlang.lib.*;
+
+import java.util.Map;
+
+public final class functional_map implements Function {
+
+    @Override
+    public Value execute(Value... args) {
+        if (args.length < 2) throw new RuntimeException("At least two args expected");
+        
+        final Value container = args[0];
+        if (container.type() == Types.ARRAY) {
+            if (args[1].type() != Types.FUNCTION) {
+                throw new RuntimeException("Function expected in second arg");
+            }
+            final Function mapper = ((FunctionValue) args[1]).getValue();
+            return mapArray((ArrayValue) container, mapper);
+        }
+        
+        if (container.type() == Types.MAP) {
+            if (args[1].type() != Types.FUNCTION) {
+                throw new RuntimeException("Function expected in second arg");
+            }
+            if (args[2].type() != Types.FUNCTION) {
+                throw new RuntimeException("Function expected in third arg");
+            }
+            final Function keyMapper = ((FunctionValue) args[1]).getValue();
+            final Function valueMapper = ((FunctionValue) args[2]).getValue();
+            return mapMap((MapValue) container, keyMapper, valueMapper);
+        }
+
+        throw new RuntimeException("Invalid first argument. Array or map exprected");
+    }
+    
+    private Value mapArray(ArrayValue array, Function mapper) {
+        final int size = array.size();
+        final ArrayValue result = new ArrayValue(size);
+        for (int i = 0; i < size; i++) {
+            result.set(i, mapper.execute(array.get(i)));
+        }
+        return result;
+    }
+    
+    private Value mapMap(MapValue map, Function keyMapper, Function valueMapper) {
+        final MapValue result = new MapValue(map.size());
+        for (Map.Entry<Value, Value> element : map) {
+            final Value newKey = keyMapper.execute(element.getKey());
+            final Value newValue = valueMapper.execute(element.getValue());
+            result.set(newKey, newValue);
+        }
+        return result;
+    }
+}

src/com/annimon/ownlang/lib/modules/functions/functional_filter.java

@@ -1,5 +1,7 @@
 package com.annimon.ownlang.lib.modules.functions;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.exceptions.TypeException;
 import com.annimon.ownlang.lib.*;
 import java.util.ArrayList;
 import java.util.List;
@@ -10,10 +12,10 @@ public final class functional_filter implements Function {
 
     @Override
     public Value execute(Value... args) {
-        if (args.length < 2) throw new RuntimeException("At least two args expected");
+        if (args.length < 2) throw new ArgumentsMismatchException("At least two args expected");
         
         if (args[1].type() != Types.FUNCTION) {
-            throw new RuntimeException("Function expected in second arg");
+            throw new TypeException("Function expected in second arg");
         }
         final Value container = args[0];
         final Function consumer = ((FunctionValue) args[1]).getValue();
@@ -25,7 +27,7 @@ public final class functional_filter implements Function {
             return filterMap((MapValue) container, consumer);
         }
 
-        throw new RuntimeException("Invalid first argument. Array or map exprected");
+        throw new TypeException("Invalid first argument. Array or map exprected");
     }
     
     private Value filterArray(ArrayValue array, Function predicate) {

src/com/annimon/ownlang/lib/modules/functions/functional_foreach.java

@@ -1,5 +1,7 @@
 package com.annimon.ownlang.lib.modules.functions;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.exceptions.TypeException;
 import com.annimon.ownlang.lib.*;
 
 import java.util.Map;
@@ -8,10 +10,10 @@ public final class functional_foreach implements Function {
 
     @Override
     public Value execute(Value... args) {
-        if (args.length != 2) throw new RuntimeException("Two args expected");
+        if (args.length != 2) throw new ArgumentsMismatchException("Two args expected");
         
         if (args[1].type() != Types.FUNCTION) {
-            throw new RuntimeException("Function expected in second arg");
+            throw new TypeException("Function expected in second arg");
         }
         final Value container = args[0];
         final Function consumer = ((FunctionValue) args[1]).getValue();
@@ -29,6 +31,6 @@ public final class functional_foreach implements Function {
             }
             return NumberValue.ZERO;
         }
-        throw new RuntimeException("Invalid first argument. Array or map exprected");
+        throw new TypeException("Invalid first argument. Array or map exprected");
     }
 }

src/com/annimon/ownlang/lib/modules/functions/functional_map.java

@@ -1,5 +1,7 @@
 package com.annimon.ownlang.lib.modules.functions;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.exceptions.TypeException;
 import com.annimon.ownlang.lib.*;
 
 import java.util.Map;
@@ -8,12 +10,12 @@ public final class functional_map implements Function {
 
     @Override
     public Value execute(Value... args) {
-        if (args.length < 2) throw new RuntimeException("At least two args expected");
+        if (args.length < 2) throw new ArgumentsMismatchException("At least two args expected");
         
         final Value container = args[0];
         if (container.type() == Types.ARRAY) {
             if (args[1].type() != Types.FUNCTION) {
-                throw new RuntimeException("Function expected in second arg");
+                throw new TypeException("Function expected in second arg");
             }
             final Function mapper = ((FunctionValue) args[1]).getValue();
             return mapArray((ArrayValue) container, mapper);
@@ -21,17 +23,17 @@ public final class functional_map implements Function {
         
         if (container.type() == Types.MAP) {
             if (args[1].type() != Types.FUNCTION) {
-                throw new RuntimeException("Function expected in second arg");
+                throw new TypeException("Function expected in second arg");
             }
             if (args[2].type() != Types.FUNCTION) {
-                throw new RuntimeException("Function expected in third arg");
+                throw new TypeException("Function expected in third arg");
             }
             final Function keyMapper = ((FunctionValue) args[1]).getValue();
             final Function valueMapper = ((FunctionValue) args[2]).getValue();
             return mapMap((MapValue) container, keyMapper, valueMapper);
         }
 
-        throw new RuntimeException("Invalid first argument. Array or map exprected");
+        throw new TypeException("Invalid first argument. Array or map exprected");
     }
     
     private Value mapArray(ArrayValue array, Function mapper) {

src/com/annimon/ownlang/lib/modules/functions/functional_reduce.java

@@ -1,5 +1,7 @@
 package com.annimon.ownlang.lib.modules.functions;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.exceptions.TypeException;
 import com.annimon.ownlang.lib.*;
 
 import java.util.Map;
@@ -8,10 +10,10 @@ public final class functional_reduce implements Function {
 
     @Override
     public Value execute(Value... args) {
-        if (args.length != 3) throw new RuntimeException("Three args expected");
+        if (args.length != 3) throw new ArgumentsMismatchException("Three args expected");
         
         if (args[2].type() != Types.FUNCTION) {
-            throw new RuntimeException("Function expected in third arg");
+            throw new TypeException("Function expected in third arg");
         }
         final Value container = args[0];
         final Value identity = args[1];
@@ -32,6 +34,6 @@ public final class functional_reduce implements Function {
             }
             return result;
         }
-        throw new RuntimeException("Invalid first argument. Array or map exprected");
+        throw new TypeException("Invalid first argument. Array or map exprected");
     }
 }

src/com/annimon/ownlang/lib/modules/functions/http_http.java

@@ -1,5 +1,7 @@
 package com.annimon.ownlang.lib.modules.functions;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.exceptions.TypeException;
 import com.annimon.ownlang.lib.*;
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
@@ -49,7 +51,7 @@ public final class http_http implements Function {
                 
             case 4: // http(url, method, params, callback)
                 if (args[3].type() != Types.FUNCTION) {
-                    throw new RuntimeException("Fourth arg must be a function callback");
+                    throw new TypeException("Fourth arg must be a function callback");
                 }
                 url = args[0].asString();
                 method = args[1].asString();
@@ -57,17 +59,17 @@ public final class http_http implements Function {
                 
             case 5: // http(url, method, params, headerParams, callback)
                 if (args[3].type() != Types.MAP) {
-                    throw new RuntimeException("Third arg must be a map");
+                    throw new TypeException("Third arg must be a map");
                 }
                 if (args[4].type() != Types.FUNCTION) {
-                    throw new RuntimeException("Fifth arg must be a function callback");
+                    throw new TypeException("Fifth arg must be a function callback");
                 }
                 url = args[0].asString();
                 method = args[1].asString();
                 return process(url, method, args[2], (MapValue) args[3], (FunctionValue) args[4]);
                 
             default:
-                throw new RuntimeException("Wrong number of arguments");
+                throw new ArgumentsMismatchException("Wrong number of arguments");
         }
     }
     

src/com/annimon/ownlang/lib/modules/functions/http_urlencode.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib.modules.functions;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
 import com.annimon.ownlang.lib.Function;
 import com.annimon.ownlang.lib.StringValue;
 import com.annimon.ownlang.lib.Value;
@@ -10,7 +11,7 @@ public final class http_urlencode implements Function {
 
     @Override
     public Value execute(Value... args) {
-        if (args.length == 0) throw new RuntimeException("At least one arg expected");
+        if (args.length == 0) throw new ArgumentsMismatchException("At least one arg expected");
         
         String charset = "UTF-8";
         if (args.length >= 2) {

src/com/annimon/ownlang/lib/modules/functions/json_decode.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib.modules.functions;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
 import com.annimon.ownlang.lib.*;
 import java.util.Iterator;
 import org.json.*;
@@ -8,7 +9,7 @@ public final class json_decode implements Function {
 
     @Override
     public Value execute(Value... args) {
-        if (args.length != 1) throw new RuntimeException("One argument expected");
+        if (args.length != 1) throw new ArgumentsMismatchException("One argument expected");
         try {
             final String jsonRaw = args[0].asString();
             final Object root = new JSONTokener(jsonRaw).nextValue();

src/com/annimon/ownlang/lib/modules/functions/json_encode.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib.modules.functions;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
 import com.annimon.ownlang.lib.*;
 import java.util.Map;
 import org.json.*;
@@ -8,7 +9,7 @@ public final class json_encode implements Function {
 
     @Override
     public Value execute(Value... args) {
-        if (args.length != 1) throw new RuntimeException("One argument expected");
+        if (args.length != 1) throw new ArgumentsMismatchException("One argument expected");
         try {
             final Object root = process(args[0]);
             final String jsonRaw = JSONObject.valueToString(root);

src/com/annimon/ownlang/lib/modules/functions/std_foreach.java

@@ -1,5 +1,7 @@
 package com.annimon.ownlang.lib.modules.functions;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.exceptions.TypeException;
 import com.annimon.ownlang.lib.*;
 
 import java.util.Map;
@@ -8,9 +10,9 @@ public final class std_foreach implements Function {
 
     @Override
     public Value execute(Value... args) {
-        if (args.length != 2) return NumberValue.ZERO;
+        if (args.length != 2) throw new ArgumentsMismatchException("Two arguments expected");
 
-        if (args[1].type() != Types.FUNCTION) return NumberValue.ZERO;
+        if (args[1].type() != Types.FUNCTION) throw new TypeException("Second arg must be a function");
         final Function function = ((FunctionValue) args[1]).getValue();
         final Value container = args[0];
         if (container.type() == Types.ARRAY) {
@@ -27,6 +29,6 @@ public final class std_foreach implements Function {
             }
             return NumberValue.ZERO;
         }
-        return NumberValue.ZERO;
+        throw new TypeException("First arg must be an array or map");
     }
 }

src/com/annimon/ownlang/lib/modules/functions/std_length.java

@@ -1,12 +1,13 @@
 package com.annimon.ownlang.lib.modules.functions;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
 import com.annimon.ownlang.lib.*;
 
 public final class std_length implements Function {
 
     @Override
     public Value execute(Value... args) {
-        if (args.length == 0) throw new RuntimeException("At least one arg expected");
+        if (args.length == 0) throw new ArgumentsMismatchException("At least one arg expected");
         
         final Value val = args[0];
         int length;

src/com/annimon/ownlang/lib/modules/functions/std_sleep.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib.modules.functions;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
 import com.annimon.ownlang.lib.Function;
 import com.annimon.ownlang.lib.NumberValue;
 import com.annimon.ownlang.lib.Value;
@@ -8,13 +9,13 @@ public final class std_sleep implements Function {
 
     @Override
     public Value execute(Value... args) {
-        if (args.length == 1) {
+        if (args.length != 1) throw new ArgumentsMismatchException("One argument expected");
+        
         try {
             Thread.sleep((long) args[0].asNumber());
         } catch (InterruptedException ex) {
             Thread.currentThread().interrupt();
         }
-        }
         return NumberValue.ZERO;
     }
 }

src/com/annimon/ownlang/lib/modules/functions/std_thread.java

@@ -1,11 +1,7 @@
 package com.annimon.ownlang.lib.modules.functions;
 
-import com.annimon.ownlang.lib.Function;
-import com.annimon.ownlang.lib.FunctionValue;
-import com.annimon.ownlang.lib.Functions;
-import com.annimon.ownlang.lib.NumberValue;
-import com.annimon.ownlang.lib.Types;
-import com.annimon.ownlang.lib.Value;
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
+import com.annimon.ownlang.lib.*;
 
 public final class std_thread implements Function {
 
@@ -13,7 +9,7 @@ public final class std_thread implements Function {
     public Value execute(Value... args) {
         // Создаём новый поток и передаём параметры, если есть.
         // Функция может передаваться как напрямую, так и по имени
-        if (args.length == 0) throw new RuntimeException("At least one arg expected");
+        if (args.length == 0) throw new ArgumentsMismatchException("At least one arg expected");
         
         Function body;
         if (args[0].type() == Types.FUNCTION) {

src/com/annimon/ownlang/lib/modules/math.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.lib.modules;
 
+import com.annimon.ownlang.exceptions.ArgumentsMismatchException;
 import com.annimon.ownlang.lib.*;
 import java.util.function.DoubleBinaryOperator;
 import java.util.function.DoubleFunction;
@@ -57,14 +58,14 @@ public final class math implements Module {
     
     private static Function functionConvert(DoubleUnaryOperator op) {
         return args -> {
-            if (args.length != 1) throw new RuntimeException("One arg expected");
+            if (args.length != 1) throw new ArgumentsMismatchException("One arg expected");
             return doubleToNumber.apply(op.applyAsDouble(args[0].asNumber()));
         };
     }
     
     private static Function biFunctionConvert(DoubleBinaryOperator op) {
         return args -> {
-            if (args.length != 2) throw new RuntimeException("Two args expected");
+            if (args.length != 2) throw new ArgumentsMismatchException("Two args expected");
             return doubleToNumber.apply(op.applyAsDouble(args[0].asNumber(), args[1].asNumber()));
         };
     }

src/com/annimon/ownlang/parser/Lexer.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.parser;
 
+import com.annimon.ownlang.exceptions.LexerException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;

src/com/annimon/ownlang/parser/Parser.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.parser;
 
+import com.annimon.ownlang.exceptions.ParseException;
 import com.annimon.ownlang.lib.NumberValue;
 import com.annimon.ownlang.lib.StringValue;
 import com.annimon.ownlang.lib.UserDefinedFunction;

src/com/annimon/ownlang/parser/ast/ArrayAccessExpression.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.parser.ast;
 
+import com.annimon.ownlang.exceptions.TypeException;
 import com.annimon.ownlang.lib.*;
 import java.util.List;
 
@@ -56,14 +57,14 @@ public final class ArrayAccessExpression implements Expression {
     
     private ArrayValue consumeArray(Value value) {
         if (value.type() != Types.ARRAY) {
-            throw new RuntimeException("Array expected");
+            throw new TypeException("Array expected");
         }
         return (ArrayValue) value;
     }
     
     public MapValue consumeMap(Value value) {
         if (value.type() != Types.MAP) {
-            throw new RuntimeException("Map expected");
+            throw new TypeException("Map expected");
         }
         return (MapValue) value;
     }

src/com/annimon/ownlang/parser/ast/BinaryExpression.java

@@ -1,5 +1,7 @@
 package com.annimon.ownlang.parser.ast;
 
+import com.annimon.ownlang.exceptions.OperationIsNotSupportedException;
+import com.annimon.ownlang.exceptions.TypeException;
 import com.annimon.ownlang.lib.ArrayValue;
 import com.annimon.ownlang.lib.NumberValue;
 import com.annimon.ownlang.lib.StringValue;
@@ -85,7 +87,7 @@ public final class BinaryExpression implements Expression {
         switch (operation) {
             case LSHIFT:
                 if (value2.type() != Types.ARRAY)
-                    throw new RuntimeException("Cannot merge non array value to array");
+                    throw new TypeException("Cannot merge non array value to array");
                 return ArrayValue.merge(value1, (ArrayValue) value2);
             case PUSH: 
             default:
@@ -113,7 +115,7 @@ public final class BinaryExpression implements Expression {
             case URSHIFT: result = (int)number1 >>> (int)number2; break;
             
             default:
-                throw new RuntimeException("Operation " + operation + " is not supported");
+                throw new OperationIsNotSupportedException(operation);
         }
         return new NumberValue(result);
     }

src/com/annimon/ownlang/parser/ast/ConditionalExpression.java

@@ -1,7 +1,7 @@
 package com.annimon.ownlang.parser.ast;
 
+import com.annimon.ownlang.exceptions.OperationIsNotSupportedException;
 import com.annimon.ownlang.lib.NumberValue;
-import com.annimon.ownlang.lib.StringValue;
 import com.annimon.ownlang.lib.Types;
 import com.annimon.ownlang.lib.Value;
 
@@ -76,7 +76,7 @@ public final class ConditionalExpression implements Expression {
             case GTEQ: result = number1 >= number2; break;
             
             default:
-                throw new RuntimeException("Operation " + operation + " is not supported");
+                throw new OperationIsNotSupportedException(operation);
         }
         return NumberValue.fromBoolean(result);
     }

src/com/annimon/ownlang/parser/ast/MatchExpression.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.parser.ast;
 
+import com.annimon.ownlang.exceptions.PatternMatchingException;
 import com.annimon.ownlang.lib.NumberValue;
 import com.annimon.ownlang.lib.Value;
 import com.annimon.ownlang.lib.Variables;
@@ -48,7 +49,7 @@ public final class MatchExpression implements Expression {
                 }
             }
         }
-        throw new RuntimeException("No pattern were matched");
+        throw new PatternMatchingException("No pattern were matched");
     }
     
     private boolean match(Value value, Value constant) {

src/com/annimon/ownlang/parser/ast/UnaryExpression.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.parser.ast;
 
+import com.annimon.ownlang.exceptions.OperationIsNotSupportedException;
 import com.annimon.ownlang.lib.NumberValue;
 import com.annimon.ownlang.lib.Value;
 
@@ -44,7 +45,7 @@ public final class UnaryExpression implements Expression {
             case COMPLEMENT: return new NumberValue(~(int)value.asNumber());
             case NOT: return new NumberValue(value.asNumber() != 0 ? 0 : 1);
             default:
-                throw new RuntimeException("Operation " + operation + " is not supported");
+                throw new OperationIsNotSupportedException(operation);
         }
     }
     

src/com/annimon/ownlang/parser/ast/VariableExpression.java

@@ -1,5 +1,6 @@
 package com.annimon.ownlang.parser.ast;
 
+import com.annimon.ownlang.exceptions.VariableDoesNotExistsException;
 import com.annimon.ownlang.lib.Value;
 import com.annimon.ownlang.lib.Variables;
 
@@ -17,7 +18,7 @@ public final class VariableExpression implements Expression {
 
     @Override
     public Value eval() {
-        if (!Variables.isExists(name)) throw new RuntimeException("Variable does not exists: " + name);
+        if (!Variables.isExists(name)) throw new VariableDoesNotExistsException(name);
         return Variables.get(name);
     }