53 lines
2.0 KiB
Java
53 lines
2.0 KiB
Java
package Models.Statements;
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import Exceptions.BaseException;
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import Models.Expressions.IExpression;
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import Models.Program.IDictionary;
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import Models.Program.ProgramState;
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import Models.Types.IType;
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import Models.Types.ReferenceType;
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import Models.Values.ReferenceValue;
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public class NewStatement implements IStatement {
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private String variableName;
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private IExpression expression;
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public NewStatement(String variableName, IExpression expression) {
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this.variableName = variableName;
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this.expression = expression;
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}
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public IStatement copy() {
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return new NewStatement(this.variableName, this.expression.copy());
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}
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public String toString() {
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return "new(" + this.variableName + ", " + this.expression.toString() + ")";
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}
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public ProgramState execute(ProgramState programState) throws BaseException {
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var symbolTable = programState.getSymbolTable();
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var heap = programState.getHeap();
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if (!symbolTable.contains(this.variableName)) {
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throw new BaseException("NewStatement: Variable is not defined");
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}
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var value = symbolTable.get(this.variableName);
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var expressionValue = this.expression.evaluate(symbolTable, heap);
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if (!value.getType().equals(new ReferenceType(expressionValue.getType()))) {
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throw new BaseException("NewStatement: Variable is not of type ReferenceType");
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}
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var address = heap.add(expressionValue);
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symbolTable.update(this.variableName, new ReferenceValue(address, expressionValue.getType()));
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return null;
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}
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public IDictionary<String, IType> typeCheck(IDictionary<String, IType> typeTable) throws BaseException {
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var variableType = typeTable.get(this.variableName);
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var expressionType = this.expression.typeCheck(typeTable);
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if (!variableType.equals(new ReferenceType(expressionType))) {
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throw new BaseException("NewStatement: Right hand side and Left hand side have different types");
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}
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return typeTable;
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}
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}
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