/*
* Redberry: symbolic tensor computations.
*
* Copyright (c) 2010-2013:
* Stanislav Poslavsky <stvlpos@mail.ru>
* Bolotin Dmitriy <bolotin.dmitriy@gmail.com>
*
* This file is part of Redberry.
*
* Redberry is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Redberry is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Redberry. If not, see <http://www.gnu.org/licenses/>.
*/
package cc.redberry.core.parser;
import cc.redberry.core.indices.Indices;
import cc.redberry.core.indices.IndicesFactory;
import cc.redberry.core.tensor.Tensor;
import cc.redberry.core.tensor.Tensors;
import java.util.Objects;
/**
* AST node for scalar functions.
*
* @author Dmitry Bolotin
* @author Stanislav Poslavsky
* @since 1.0
*/
public final class ParseTokenScalarFunction extends ParseToken {
/**
* Function string name.
*/
public String function;
/**
* @param function function string name
* @param content child nodes
*/
public ParseTokenScalarFunction(String function, ParseToken[] content) {
super(TokenType.ScalarFunction, content);
if (content.length != 1)
throw new IllegalArgumentException();
this.function = function;
}
@Override
public Indices getIndices() {
return IndicesFactory.EMPTY_INDICES;
}
@Override
public String toString() {
return function + "[" + content[0] + "]";
}
@Override
public Tensor toTensor() {
if (content.length != 1)
throw new IllegalArgumentException("Wrong scalar function node.");
Tensor arg = content[0].toTensor();
switch (function.toLowerCase()) {
case "sin":
return Tensors.sin(arg);
case "cos":
return Tensors.cos(arg);
case "tan":
return Tensors.tan(arg);
case "cot":
return Tensors.cot(arg);
case "arcsin":
return Tensors.arcsin(arg);
case "arccos":
return Tensors.arccos(arg);
case "arctan":
return Tensors.arctan(arg);
case "arccot":
return Tensors.arccot(arg);
case "log":
return Tensors.log(arg);
case "exp":
return Tensors.exp(arg);
}
throw new IllegalStateException("Unknown scalar function \"" + function + "\".");
}
@Override
public boolean equals(Object obj) {
if (!super.equals(obj))
return false;
final ParseTokenScalarFunction other = (ParseTokenScalarFunction) obj;
return Objects.equals(this.function, other.function);
}
}