1 files changed, 152 insertions, 0 deletions
diff --git a/src/main/java/org/zwobble/couscous/backends/python/PythonPrimitiveMethods.java b/src/main/java/org/zwobble/couscous/backends/python/PythonPrimitiveMethods.java
new file mode 100644
index 0000000..6d6db82
--- /dev/null
+++ b/src/main/java/org/zwobble/couscous/backends/python/PythonPrimitiveMethods.java
@@ -0,0 +1,152 @@
+package org.zwobble.couscous.backends.python;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableMap.Builder;
+import org.zwobble.couscous.ast.Operator;
+import org.zwobble.couscous.ast.TypeName;
+import org.zwobble.couscous.backends.python.ast.PythonBinaryOperation;
+import org.zwobble.couscous.backends.python.ast.PythonExpressionNode;
+import org.zwobble.couscous.backends.python.ast.PythonNotNode;
+import org.zwobble.couscous.values.*;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.function.BiFunction;
+
+import static org.zwobble.couscous.backends.python.ast.PythonAttributeAccessNode.pythonAttributeAccess;
+import static org.zwobble.couscous.backends.python.ast.PythonBinaryOperation.pythonIs;
+import static org.zwobble.couscous.backends.python.ast.PythonCallNode.pythonCall;
+import static org.zwobble.couscous.backends.python.ast.PythonGetSliceNode.pythonGetSlice;
+import static org.zwobble.couscous.backends.python.ast.PythonVariableReferenceNode.pythonVariableReference;
+import static org.zwobble.couscous.util.ExtraLists.list;
+
+public class PythonPrimitiveMethods {
+    private static final Map<String, PrimitiveMethodGenerator> STRING_METHODS =
+        ImmutableMap.<String, PrimitiveMethodGenerator>builder()
+        
+            .put("length", (receiver, arguments) ->
+                pythonCall(
+                    pythonVariableReference("len"),
+                    list(receiver)))
+            
+            .put("substring", (receiver, arguments) ->
+                pythonGetSlice(receiver, arguments))
+
+            .put(Operator.ADD.getSymbol(), (receiver, arguments) ->
+                PythonBinaryOperation.pythonAdd(receiver, arguments.get(0)))
+
+            .put("toLowerCase", (receiver, arguments) ->
+                pythonCall(pythonAttributeAccess(receiver, "lower"), list()))
+
+            .put("equals", (receiver, arguments) ->
+                PythonBinaryOperation.pythonEqual(receiver, arguments.get(0)))
+
+            .build();
+    
+    private static final Map<String, PrimitiveMethodGenerator> BOOLEAN_METHODS;
+
+    static {
+        ImmutableMap.Builder<String, PrimitiveMethodGenerator> methods = ImmutableMap.builder();
+
+        methods.put(Operator.BOOLEAN_NOT.getSymbol(), (receiver, arguments) ->
+            PythonNotNode.pythonNot(receiver));
+
+        addOperation(methods, Operator.BOOLEAN_AND, PythonBinaryOperation::pythonAnd);
+        addOperation(methods, Operator.BOOLEAN_OR, PythonBinaryOperation::pythonOr);
+
+        BOOLEAN_METHODS = methods.build();
+    }
+    
+    private static final Map<String, PrimitiveMethodGenerator> INT_METHODS;
+        
+    static {
+        ImmutableMap.Builder<String, PrimitiveMethodGenerator> methods = ImmutableMap.builder();
+
+        methods.put("toString", (receiver, arguments) ->
+            pythonCall(pythonVariableReference("str"), list(receiver)));
+        
+        addOperation(methods, Operator.ADD, PythonBinaryOperation::pythonAdd);
+        addOperation(methods, Operator.SUBTRACT, PythonBinaryOperation::pythonSubtract);
+        addOperation(methods, Operator.MULTIPLY, PythonBinaryOperation::pythonMultiply);
+
+        methods.put(Operator.DIVIDE.getSymbol(), (receiver, arguments) ->
+            pythonCall(
+                internalReference("_div_round_to_zero"),
+                list(receiver, arguments.get(0))));
+        methods.put(Operator.MOD.getSymbol(), (receiver, arguments) ->
+            pythonCall(
+                internalReference("_mod_round_to_zero"),
+                list(receiver, arguments.get(0))));
+
+        addOperation(methods, Operator.EQUALS, PythonBinaryOperation::pythonEqual);
+        addOperation(methods, Operator.NOT_EQUALS, PythonBinaryOperation::pythonNotEqual);
+        addOperation(methods, Operator.GREATER_THAN, PythonBinaryOperation::pythonGreaterThan);
+        addOperation(methods, Operator.GREATER_THAN_OR_EQUAL, PythonBinaryOperation::pythonGreatThanOrEqual);
+        addOperation(methods, Operator.LESS_THAN, PythonBinaryOperation::pythonLessThan);
+        addOperation(methods, Operator.LESS_THAN_OR_EQUAL, PythonBinaryOperation::pythonLessThanOrEqual);
+        
+        INT_METHODS = methods.build();
+    }
+    
+    private static PythonExpressionNode internalReference(String name) {
+        return pythonAttributeAccess(pythonVariableReference("_couscous"), name);
+    }
+
+    private static void addOperation(
+        Builder<String, PrimitiveMethodGenerator> methods,
+        Operator operator,
+        BiFunction<PythonExpressionNode, PythonExpressionNode, PythonExpressionNode> build)
+    {
+        addOperation(methods, operator.getSymbol(), build);
+    }
+    
+    private static void addOperation(
+        Builder<String, PrimitiveMethodGenerator> methods,
+        String methodName,
+        BiFunction<PythonExpressionNode, PythonExpressionNode, PythonExpressionNode> build)
+    {
+        methods.put(methodName, (receiver, arguments) -> 
+            build.apply(receiver, arguments.get(0)));
+    }
+    
+    private static final Map<TypeName, Map<String, PrimitiveMethodGenerator>> METHODS = 
+        ImmutableMap.<TypeName, Map<String, PrimitiveMethodGenerator>>builder()
+            .put(StringValue.REF, STRING_METHODS)
+            .put(BooleanValue.REF, BOOLEAN_METHODS)
+            .put(IntegerValue.REF, INT_METHODS)
+            .put(ObjectValues.BOXED_INT, INT_METHODS)
+            .build();
+    
+    private static final Map<String, PrimitiveStaticMethodGenerator> INTERNAL_METHODS =
+        ImmutableMap.<String, PrimitiveStaticMethodGenerator>builder()
+        
+            .put("same", arguments -> pythonIs(arguments.get(0), arguments.get(1)))
+            
+            .build();
+    
+    private static final Map<TypeName, Map<String, PrimitiveStaticMethodGenerator>> STATIC_METHODS = 
+        ImmutableMap.<TypeName, Map<String, PrimitiveStaticMethodGenerator>>builder()
+            .put(InternalCouscousValue.REF, INTERNAL_METHODS)
+            .build();
+
+    public static Optional<PrimitiveMethodGenerator> getPrimitiveMethod(TypeName type, String methodName) {
+        return Optional.ofNullable(METHODS.get(type))
+            .flatMap(methodsForType -> Optional.ofNullable(methodsForType.get(methodName)));
+    }
+    
+    @FunctionalInterface
+    public interface PrimitiveMethodGenerator {
+        PythonExpressionNode generate(PythonExpressionNode receiver, List<PythonExpressionNode> arguments);
+    }
+
+    public static Optional<PrimitiveStaticMethodGenerator> getPrimitiveStaticMethod(TypeName type, String methodName) {
+        return Optional.ofNullable(STATIC_METHODS.get(type))
+            .flatMap(methodsForType -> Optional.ofNullable(methodsForType.get(methodName)));
+    }
+    
+    @FunctionalInterface
+    public interface PrimitiveStaticMethodGenerator {
+        PythonExpressionNode generate(List<PythonExpressionNode> arguments);
+    }
+}