nl.knaw.huygens.alexandria.texmecs.importer.TexMECSImporterInMemory.java Source code

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Here is the source code for nl.knaw.huygens.alexandria.texmecs.importer.TexMECSImporterInMemory.java

Source

package nl.knaw.huygens.alexandria.texmecs.importer;

/*
 * #%L
 * alexandria-markup
 * =======
 * Copyright (C) 2016 - 2018 HuC DI (KNAW)
 * =======
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import nl.knaw.huygens.alexandria.ErrorListener;
import nl.knaw.huygens.alexandria.data_model.Document;
import nl.knaw.huygens.alexandria.data_model.Limen;
import nl.knaw.huygens.alexandria.data_model.Markup;
import nl.knaw.huygens.alexandria.texmecs.grammar.TexMECSLexer;
import nl.knaw.huygens.alexandria.texmecs.grammar.TexMECSParser;
import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.tree.ParseTree;
import org.antlr.v4.runtime.tree.ParseTreeWalker;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStream;
import java.io.UncheckedIOException;
import java.util.List;

class TexMECSImporterInMemory {
    private final Logger LOG = LoggerFactory.getLogger(getClass());

    public Document importTexMECS(String input) throws TexMECSSyntaxError {
        CharStream antlrInputStream = CharStreams.fromString(input);
        return importTexMECS(antlrInputStream);
    }

    public Document importTexMECS(InputStream input) throws TexMECSSyntaxError {
        try {
            CharStream antlrInputStream = CharStreams.fromStream(input);
            return importTexMECS(antlrInputStream);
        } catch (IOException e) {
            e.printStackTrace();
            throw new UncheckedIOException(e);
        }
    }

    private Document importTexMECS(CharStream antlrInputStream) {
        TexMECSLexer lexer = new TexMECSLexer(antlrInputStream);
        ErrorListener errorListener = new ErrorListener();
        lexer.addErrorListener(errorListener);
        CommonTokenStream tokens = new CommonTokenStream(lexer);

        TexMECSParser parser = new TexMECSParser(tokens);
        parser.addErrorListener(errorListener);
        parser.setBuildParseTree(true);
        ParseTree parseTree = parser.document();
        int numberOfSyntaxErrors = parser.getNumberOfSyntaxErrors();
        LOG.debug("parsed with {} syntax errors", numberOfSyntaxErrors);
        ParseTreeWalker parseTreeWalker = new ParseTreeWalker();
        TexMECSListenerInMemory listener = new TexMECSListenerInMemory();
        parseTreeWalker.walk(listener, parseTree);
        Document document = listener.getDocument();
        handleMarkupDominance(document.value());

        String errorMsg = "";
        if (listener.hasErrors()) {
            String errors = String.join("\n", listener.getErrors());
            errorMsg = "Parsing errors:\n" + errors;
        }
        if (numberOfSyntaxErrors > 0) {
            String errors = String.join("\n", errorListener.getErrors());
            errorMsg += "\n\nTokenizing errors:\n" + errors;
        }
        if (!errorMsg.isEmpty()) {
            throw new TexMECSSyntaxError(errorMsg);
        }
        return document;
    }

    private void handleMarkupDominance(Limen limen) {
        List<Markup> markupList = limen.markupList;
        for (int i = 0; i < markupList.size() - 1; i++) {
            Markup first = markupList.get(i);
            Markup second = markupList.get(i + 1);
            if (first.textNodes.equals(second.textNodes)) {
                // LOG.info("dominance found: {} dominates {}", first.getExtendedTag(), second.getExtendedTag());
                first.setDominatedMarkup(second);
            }
        }
    }

}