69 lines
2.3 KiB
Java
69 lines
2.3 KiB
Java
/**
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* Serene (simple) - A PoC lisp to collect data on Serenes concepts
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* Copyright (C) 2019-2020 Sameer Rahmani <lxsameer@gnu.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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package serene.simple;
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import java.util.function.Function;
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public class FnSpecialForm extends SpecialForm {
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public FnSpecialForm(ListNode<Node> paramsAndBody) {
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super(paramsAndBody);
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}
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@Override
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public Object eval(final BaseScope parentScope) {
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final ListNode<Node> formalParams = (ListNode<Node>) this.node.rest().first();
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final ListNode<Node> body = this.node.rest().rest();
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return new Function<Object, Object>() {
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@Override
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public Object apply(Object arguments) {
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Object[] args = (Object[]) arguments;
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Scope scope = new Scope(parentScope);
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if (args.length != formalParams.length) {
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throw new RuntimeException(String.format("Wrong number of arguments. Expected: %s, Got: %s.",
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formalParams.length,
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args.length));
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}
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// Map parameter values to formal parameter names
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int i = 0;
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for (Node param : formalParams) {
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SymbolNode paramSymbol = (SymbolNode) param;
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scope.insertSymbol(paramSymbol.name, args[i]);
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i++;
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}
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// Evaluate body
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Object output = null;
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for (Node node : body) {
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output = node.eval(scope);
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}
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return output;
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}
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@Override
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public String toString() {
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return "Function@" + System.identityHashCode(this);
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}
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};
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}
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}
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