iText layout.jar Source Code

layout.jar is a component in iText Java library to provide layout functionalities. iText Java library allows you to generate and manage PDF documents.

The Source Code files are provided together with the JAR file in the binary packge like iText7-Core-7.1.4.zip. You can download it at iText 7 Core Download site.

You can compile it to generate your JAR file, using layout.pom as the build configuration file.

The source code of layout-7.1.4.jar is provided below:

✍: FYIcenter.com

com/itextpdf/layout/hyphenation/PatternParser.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

package com.itextpdf.layout.hyphenation;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import javax.xml.parsers.SAXParserFactory;

import com.itextpdf.io.util.ResourceUtil;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

/**
 * <p>A SAX document handler to read and parse hyphenation patterns
 * from a XML file.</p>
 *
 * <p>This work was authored by Carlos Villegas (cav@uniscope.co.jp).</p>
 */
public class PatternParser extends DefaultHandler {

    private XMLReader parser;
    private int currElement;
    private IPatternConsumer consumer;
    private StringBuilder token;
    private ArrayList exception;
    private char hyphenChar;
    private String errMsg;
    private boolean hasClasses;

    static final int ELEM_CLASSES = 1;
    static final int ELEM_EXCEPTIONS = 2;
    static final int ELEM_PATTERNS = 3;
    static final int ELEM_HYPHEN = 4;

    /**
     * Construct a pattern parser.
     * @throws HyphenationException if a hyphenation exception is raised
     */
    private PatternParser() throws HyphenationException {
        token = new StringBuilder();
        parser = createParser();
        parser.setContentHandler(this);
        parser.setErrorHandler(this);
        hyphenChar = '-';    // default
    }

    /**
     * Construct a pattern parser.
     * @param consumer a pattern consumer
     * @throws HyphenationException if a hyphenation exception is raised
     */
    public PatternParser(IPatternConsumer consumer) throws HyphenationException {
        this();
        this.consumer = consumer;
    }

    /**
     * Parses a hyphenation pattern file.
     * @param filename the filename
     * @throws HyphenationException In case of an exception while parsing
     */
    public void parse(String filename) throws HyphenationException, FileNotFoundException {
        parse(new FileInputStream(filename), filename);
    }

    /**
     * Parses a hyphenation pattern file.
     * @param stream the InputStream for the file
     * @param name unique key representing country-language combination
     *
     * @throws HyphenationException In case of an exception while parsing
     */
    public void parse(InputStream stream, String name) throws HyphenationException {
        InputSource source = new InputSource(stream);
        source.setSystemId(name);
        try {
            parser.parse(source);
        } catch (FileNotFoundException fnfe) {
            throw new HyphenationException("File not found: " + fnfe.getMessage());
        } catch (IOException ioe) {
            throw new HyphenationException(ioe.getMessage());
        } catch (SAXException e) {
            throw new HyphenationException(errMsg);
        }
    }

    /**
     * Creates a SAX parser using JAXP
     * @return the created SAX parser
     */
    static XMLReader createParser() {
        try {
            SAXParserFactory factory = SAXParserFactory.newInstance();
            factory.setNamespaceAware(true);
            factory.setValidating(false);
            factory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
            return factory.newSAXParser().getXMLReader();
        } catch (Exception e) {
            throw new RuntimeException("Couldn't create XMLReader: " + e.getMessage());
        }
    }

    private String readToken(StringBuilder chars) {
        String word;
        boolean space = false;
        int i;
        for (i = 0; i < chars.length(); i++) {
            if (Character.isWhitespace(chars.charAt(i))) {
                space = true;
            } else {
                break;
            }
        }
        if (space) {
            // chars.delete(0,i);
            for (int countr = i; countr < chars.length(); countr++) {
                chars.setCharAt(countr - i, chars.charAt(countr));
            }
            chars.setLength(chars.length() - i);
            if (token.length() > 0) {
                word = token.toString();
                token.setLength(0);
                return word;
            }
        }
        space = false;
        for (i = 0; i < chars.length(); i++) {
            if (Character.isWhitespace(chars.charAt(i))) {
                space = true;
                break;
            }
        }
        token.append(chars.toString().substring(0, i));
        // chars.delete(0,i);
        for (int countr = i; countr < chars.length(); countr++) {
            chars.setCharAt(countr - i, chars.charAt(countr));
        }
        chars.setLength(chars.length() - i);
        if (space) {
            word = token.toString();
            token.setLength(0);
            return word;
        }
        token.append(chars);
        return null;
    }

    private static String getPattern(String word) {
        StringBuilder pat = new StringBuilder();
        int len = word.length();
        for (int i = 0; i < len; i++) {
            if (!Character.isDigit(word.charAt(i))) {
                pat.append(word.charAt(i));
            }
        }
        return pat.toString();
    }

    private ArrayList normalizeException(ArrayList ex) {
        ArrayList res = new ArrayList();
        for (int i = 0; i < ex.size(); i++) {
            Object item = ex.get(i);
            if (item instanceof String) {
                String str = (String)item;
                StringBuilder buf = new StringBuilder();
                for (int j = 0; j < str.length(); j++) {
                    char c = str.charAt(j);
                    if (c != hyphenChar) {
                        buf.append(c);
                    } else {
                        res.add(buf.toString());
                        buf.setLength(0);
                        char[] h = new char[1];
                        h[0] = hyphenChar;
                        // we use here hyphenChar which is not necessarily
                        // the one to be printed
                        res.add(new Hyphen(new String(h), null, null));
                    }
                }
                if (buf.length() > 0) {
                    res.add(buf.toString());
                }
            } else {
                res.add(item);
            }
        }
        return res;
    }

    private String getExceptionWord(ArrayList ex) {
        StringBuilder res = new StringBuilder();
        for (int i = 0; i < ex.size(); i++) {
            Object item = ex.get(i);
            if (item instanceof String) {
                res.append((String)item);
            } else {
                if (((Hyphen)item).noBreak != null) {
                    res.append(((Hyphen)item).noBreak);
                }
            }
        }
        return res.toString();
    }

    private static String getInterletterValues(String pat) {
        StringBuilder il = new StringBuilder();
        String word = pat + "a";    // add dummy letter to serve as sentinel
        int len = word.length();
        for (int i = 0; i < len; i++) {
            char c = word.charAt(i);
            if (Character.isDigit(c)) {
                il.append(c);
                i++;
            } else {
                il.append('0');
            }
        }
        return il.toString();
    }

    /** @throws SAXException if not caught */
    protected void getExternalClasses() throws SAXException {
        XMLReader mainParser = parser;
        parser = createParser();
        parser.setContentHandler(this);
        parser.setErrorHandler(this);
        InputStream stream = ResourceUtil.getResourceStream(HyphenationConstants.HYPHENATION_DEFAULT_RESOURCE + "external/classes.xml");
        InputSource source = new InputSource(stream);
        try {
            parser.parse(source);
        } catch (IOException ioe) {
            throw new SAXException(ioe.getMessage());
        } finally {
            parser = mainParser;
        }
    }

    //
    // ContentHandler methods
    //

    /**
     * {@inheritDoc}
     * @throws SAXException
     */
    public void startElement(String uri, String local, String raw,
                             Attributes attrs) throws SAXException {
        if (local.equals("hyphen-char")) {
            String h = attrs.getValue("value");
            if (h != null && h.length() == 1) {
                hyphenChar = h.charAt(0);
            }
        } else if (local.equals("classes")) {
            currElement = ELEM_CLASSES;
        } else if (local.equals("patterns")) {
            if (!hasClasses) {
                getExternalClasses();
            }
            currElement = ELEM_PATTERNS;
        } else if (local.equals("exceptions")) {
            if (!hasClasses) {
                getExternalClasses();
            }
            currElement = ELEM_EXCEPTIONS;
            exception = new ArrayList();
        } else if (local.equals("hyphen")) {
            if (token.length() > 0) {
                exception.add(token.toString());
            }
            exception.add(new Hyphen(attrs.getValue("pre"),
                                            attrs.getValue("no"),
                                            attrs.getValue("post")));
            currElement = ELEM_HYPHEN;
        }
        token.setLength(0);
    }

    /**
     * {@inheritDoc}
     */
    public void endElement(String uri, String local, String raw) {

        if (token.length() > 0) {
            String word = token.toString();
            switch (currElement) {
            case ELEM_CLASSES:
                consumer.addClass(word);
                break;
            case ELEM_EXCEPTIONS:
                exception.add(word);
                exception = normalizeException(exception);
                consumer.addException(getExceptionWord(exception),
                                      (ArrayList)exception.clone());
                break;
            case ELEM_PATTERNS:
                consumer.addPattern(getPattern(word),
                                    getInterletterValues(word));
                break;
            case ELEM_HYPHEN:
                // nothing to do
                break;
            default:
                break;
            }
            if (currElement != ELEM_HYPHEN) {
                token.setLength(0);
            }
        }
        if (currElement == ELEM_CLASSES) {
            hasClasses = true;
        }
        if (currElement == ELEM_HYPHEN) {
            currElement = ELEM_EXCEPTIONS;
        } else {
            currElement = 0;
        }

    }

    /**
     * {@inheritDoc}
     */
    public void characters(char[] ch, int start, int length) {
        StringBuilder chars = new StringBuilder(length);
        chars.append(ch, start, length);
        String word = readToken(chars);
        while (word != null) {
            // System.out.println("\"" + word + "\"");
            switch (currElement) {
            case ELEM_CLASSES:
                consumer.addClass(word);
                break;
            case ELEM_EXCEPTIONS:
                exception.add(word);
                exception = normalizeException(exception);
                consumer.addException(getExceptionWord(exception),
                                      (ArrayList)exception.clone());
                exception.clear();
                break;
            case ELEM_PATTERNS:
                consumer.addPattern(getPattern(word),
                                    getInterletterValues(word));
                break;
            default:
                break;
            }
            word = readToken(chars);
        }

    }

    //
    // ErrorHandler methods
    //

    /**
     * {@inheritDoc}
     */
    public void warning(SAXParseException ex) {
        errMsg = "[Warning] " + getLocationString(ex) + ": "
                 + ex.getMessage();
    }

    /**
     * {@inheritDoc}
     */
    public void error(SAXParseException ex) {
        errMsg = "[Error] " + getLocationString(ex) + ": " + ex.getMessage();
    }

    /**
     * {@inheritDoc}
     */
    public void fatalError(SAXParseException ex) throws SAXException {
        errMsg = "[Fatal Error] " + getLocationString(ex) + ": "
                 + ex.getMessage();
        throw ex;
    }

    /**
     * Returns a string of the location.
     */
    private String getLocationString(SAXParseException ex) {
        StringBuilder str = new StringBuilder();

        String systemId = ex.getSystemId();
        if (systemId != null) {
            int index = systemId.lastIndexOf('/');
            if (index != -1) {
                systemId = systemId.substring(index + 1);
            }
            str.append(systemId);
        }
        str.append(':');
        str.append(ex.getLineNumber());
        str.append(':');
        str.append(ex.getColumnNumber());

        return str.toString();

    }    // getLocationString(SAXParseException):String


}

com/itextpdf/layout/hyphenation/PatternParser.java

 

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2021-07-03, 9142👍, 0💬