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package org.zwobble.couscous.interpreter;
import java.util.Map;
import java.util.Optional;
import org.zwobble.couscous.Project;
import org.zwobble.couscous.ast.VariableNode;
import org.zwobble.couscous.values.ConcreteType;
import org.zwobble.couscous.values.InterpreterValue;
import org.zwobble.couscous.values.TypeReference;
import static java.util.stream.Collectors.toMap;
import static org.zwobble.couscous.util.CousCousMaps.mapKeys;
import lombok.val;
public class Environment {
private final Project project;
private final Map<Integer, Optional<InterpreterValue>> stackFrameValues;
private final Map<Integer, TypeReference> stackFrameTypes;
public Environment(Project project, Map<VariableNode, Optional<InterpreterValue>> stackFrame) {
this.project = project;
this.stackFrameValues = mapKeys(stackFrame, variable -> variable.getId());
this.stackFrameTypes = stackFrame.keySet()
.stream()
.collect(toMap(variable -> variable.getId(), variable -> variable.getType()));
}
public InterpreterValue get(int variableId) {
checkVariableIsInScope(variableId);
val value = stackFrameValues.get(variableId);
return value.orElseThrow(() -> new UnboundVariable(variableId));
}
public void put(int variableId, InterpreterValue value) {
checkVariableIsInScope(variableId);
checkVariableType(variableId, value);
stackFrameValues.put(variableId, Optional.of(value));
}
public void put(VariableNode variable, InterpreterValue value) {
put(variable.getId(), value);
}
public ConcreteType<?> findClass(String className) {
// TODO: handle missing classes
return project.findClass(className);
}
public Environment withStackFrame(Map<VariableNode, Optional<InterpreterValue>> stackFrame) {
return new Environment(project, stackFrame);
}
private void checkVariableIsInScope(int variableId) {
if (!stackFrameValues.containsKey(variableId)) {
throw new VariableNotInScope(variableId);
}
}
private void checkVariableType(int variableId, InterpreterValue value) {
val variableType = stackFrameTypes.get(variableId);
val valueType = value.getType().getReference();
if (!variableType.equals(valueType)) {
throw new UnexpectedValueType(variableType, valueType);
}
}
}
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