27 lines
1.0 KiB
Java
27 lines
1.0 KiB
Java
package org.nfunk.jep.function;
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import java.util.Stack;
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import org.nfunk.jep.ASTVarNode;
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import org.nfunk.jep.Node;
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import org.nfunk.jep.ParseException;
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import org.nfunk.jep.ParserVisitor;
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import org.nfunk.jep.Variable;
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public class Assign extends PostfixMathCommand implements SpecialEvaluationI {
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public Object evaluate(Node paramNode, Object paramObject, ParserVisitor paramParserVisitor, Stack paramStack) throws ParseException {
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if (paramNode.jjtGetNumChildren() != 2)
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throw new ParseException("Assignment opperator must have 2 operators.");
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paramNode.jjtGetChild(1).jjtAccept(paramParserVisitor, paramObject);
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checkStack(paramStack);
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Object object = paramStack.peek();
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Node node = paramNode.jjtGetChild(0);
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if (node instanceof ASTVarNode) {
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ASTVarNode aSTVarNode = (ASTVarNode)node;
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Variable variable = aSTVarNode.getVar();
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variable.setValue(object);
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return object;
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}
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throw new ParseException("Assignment should have a variable for the lhs.");
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}
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}
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