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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.document.select.rule;
import com.yahoo.document.BucketIdFactory;
import com.yahoo.document.datatypes.NumericFieldValue;
import com.yahoo.document.select.BucketSet;
import com.yahoo.document.select.Context;
import com.yahoo.document.select.Result;
import com.yahoo.document.select.Visitor;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.List;
import java.util.ArrayList;
/**
* @author Simon Thoresen Hult
*/
public class ArithmeticNode implements ExpressionNode {
public static final int NOP = 0;
public static final int ADD = 1;
public static final int SUB = 2;
public static final int MOD = 3;
public static final int DIV = 4;
public static final int MUL = 5;
private final List<NodeItem> items = new ArrayList<>();
public ArithmeticNode() {
// empty
}
public ArithmeticNode add(String operator, ExpressionNode node) {
items.add(new NodeItem(stringToOperator(operator), node));
return this;
}
public List<NodeItem> getItems() {
return items;
}
@Override
public BucketSet getBucketSet(BucketIdFactory factory) {
return null;
}
@Override
public Object evaluate(Context context) {
StringBuilder ret = null;
Deque<ValueItem> buf = new ArrayDeque<>();
for (int i = 0; i < items.size(); ++i) {
NodeItem item = items.get(i);
Object val = item.node.evaluate(context);
if (val == null) {
throw new IllegalArgumentException("Can not perform arithmetic on null value (referencing missing field?)");
}
if (val instanceof AttributeNode.VariableValueList value) {
if (value.size() == 0) {
throw new IllegalArgumentException("Can not perform arithmetic on missing field: "
+ item.node.toString());
} else if (value.size() != 1) {
throw new IllegalStateException("Arithmetic is only valid for single values.");
} else {
val = value.get(0).getValue();
}
}
if (val instanceof NumericFieldValue) {
val = ((NumericFieldValue)val).getNumber();
}
if (val instanceof String) {
if (i == 0) {
ret = new StringBuilder();
}
if (ret != null) {
ret.append(val);
continue;
}
} else if (val instanceof Number) {
if (!buf.isEmpty()) {
while (buf.peek().operator > item.operator) {
popOffTheTop(buf);
}
}
buf.push(new ValueItem(item.operator, (Number)val));
continue;
} else if (val == Result.INVALID) {
return val;
}
throw new IllegalStateException("Term '" + item.node + " with class " + val.getClass() + "' does not evaluate to a number.");
}
if (ret != null) {
return ret.toString();
}
while (buf.size() > 1) {
popOffTheTop(buf);
}
return buf.pop().value;
}
private void popOffTheTop(Deque<ValueItem> buf) {
ValueItem rhs = buf.pop();
ValueItem lhs = buf.pop();
switch (rhs.operator) {
case ADD -> lhs.value = lhs.value.doubleValue() + rhs.value.doubleValue();
case SUB -> lhs.value = lhs.value.doubleValue() - rhs.value.doubleValue();
case DIV -> lhs.value = lhs.value.doubleValue() / rhs.value.doubleValue();
case MUL -> lhs.value = lhs.value.doubleValue() * rhs.value.doubleValue();
case MOD -> lhs.value = lhs.value.longValue() % rhs.value.longValue();
default -> throw new IllegalStateException("Arithmetic operator " + rhs.operator + " not supported.");
}
buf.push(lhs);
}
@Override
public String toString() {
StringBuilder ret = new StringBuilder();
for (NodeItem item : items) {
if (item.operator != NOP) {
ret.append(" ").append(operatorToString(item.operator)).append(" ");
}
ret.append(item.node);
}
return ret.toString();
}
public String operatorToString(int operator) {
return switch (operator) {
case NOP -> null;
case ADD -> "+";
case SUB -> "-";
case MOD -> "%";
case DIV -> "/";
case MUL -> "*";
default -> throw new IllegalStateException("Arithmetic operator " + operator + " not supported.");
};
}
private int stringToOperator(String operator) {
if (operator == null) {
return NOP;
} else if (operator.equals("+")) {
return ADD;
} else if (operator.equals("-")) {
return SUB;
} else if (operator.equals("%")) {
return MOD;
} else if (operator.equals("/")) {
return DIV;
} else if (operator.equals("*")) {
return MUL;
} else {
throw new IllegalStateException("Arithmetic operator '" + operator + "' not supported.");
}
}
@Override
public void accept(Visitor visitor) {
visitor.visit(this);
}
private static class ValueItem {
public int operator;
public Number value;
ValueItem(int operator, Number value) {
this.operator = operator;
this.value = value;
}
}
public static class NodeItem {
private final int operator;
private final ExpressionNode node;
NodeItem(int operator, ExpressionNode node) {
this.operator = operator;
this.node = node;
}
public int getOperator() {
return operator;
}
public ExpressionNode getNode() {
return node;
}
}
}
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