001/*
002 * Copyright 2020  nils.hoffmann.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package de.isas.lipidomics.palinom.sumformula;
017
018import de.isas.lipidomics.domain.Element;
019import de.isas.lipidomics.domain.ElementTable;
020import de.isas.lipidomics.palinom.SumFormulaBaseVisitor;
021import de.isas.lipidomics.palinom.SumFormulaParser;
022import java.util.Optional;
023
024/**
025 *
026 * Base visitor implementation for the SumFormula grammar.
027 *
028 * Overriding implementation of {@link SumFormulaBaseVisitor}. Creates
029 * {@link ElementTable} instances from the provided context.
030 *
031 * @see SumFormulaVisitorParser
032 * @author nils.hoffmann
033 */
034public class SumFormulaVisitorImpl extends SumFormulaBaseVisitor<ElementTable> {
035
036    @Override
037    public ElementTable visitMolecule(SumFormulaParser.MoleculeContext ctx) {
038        if (ctx.molecule_rule() != null) {
039            SumFormulaParser.Molecule_groupContext moleculeGroup = ctx.molecule_rule().molecule_group();
040            return visitMoleculeGroup(moleculeGroup, new ElementTable());
041        }
042        return new ElementTable();
043    }
044
045    private ElementTable visitMoleculeGroup(SumFormulaParser.Molecule_groupContext moleculeGroup, ElementTable table) {
046        if (moleculeGroup.element_group() != null) {
047            visitElementGroup(moleculeGroup.element_group(), table);
048        } else if (moleculeGroup.single_element() != null) {
049            visitSingleElement(moleculeGroup.single_element(), table);
050        } else if (moleculeGroup.molecule_group() != null) {
051            moleculeGroup.molecule_group().stream().forEach((moleculeGroupCtx) -> {
052                visitMoleculeGroup(moleculeGroupCtx, table);
053            });
054        }
055        return table;
056    }
057
058    private ElementTable visitSingleElement(SumFormulaParser.Single_elementContext singleElement, ElementTable table) {
059        Optional<Element> element = Element.forName(singleElement.element().getText());
060        if (element.isPresent()) {
061            table.increment(element.get());
062        }
063        return table;
064    }
065
066    private ElementTable visitElementGroup(SumFormulaParser.Element_groupContext elementGroup, ElementTable table) {
067        Integer count = 0;
068        if (elementGroup.count() == null) {
069            count = 1;
070        } else {
071            count = Integer.parseInt(elementGroup.count().getText());
072        }
073        Optional<Element> element = Element.forName(elementGroup.element().getText());
074        if (element.isPresent()) {
075            table.incrementBy(element.get(), count);
076        }
077        return table;
078    }
079}