com.itextpdf.text.pdf.HyphenationAuto Maven / Gradle / Ivy

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/*
 *
 * This file is part of the iText (R) project.
 * Copyright (c) 1998-2016 iText Group NV
 * Authors: Bruno Lowagie, Paulo Soares, et al.
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package com.itextpdf.text.pdf;

import com.itextpdf.text.pdf.hyphenation.Hyphenation;
import com.itextpdf.text.pdf.hyphenation.Hyphenator;

/** Hyphenates words automatically accordingly to the language and country.
 * The hyphenator engine was taken from FOP and uses the TEX patterns. If a language
 * is not provided and a TEX pattern for it exists, it can be easily adapted.
 *
 * @author Paulo Soares
 */
public class HyphenationAuto implements HyphenationEvent {

    /** The hyphenator engine.
     */    
    protected Hyphenator hyphenator;
    /** The second part of the hyphenated word.
     */    
    protected String post;
    
    /** Creates a new hyphenation instance usable in Chunk.
     * @param lang the language ("en" for English, for example)
     * @param country the country ("GB" for Great-Britain or "none" for no country, for example)
     * @param leftMin the minimum number of letters before the hyphen
     * @param rightMin the minimum number of letters after the hyphen
     */    
    public HyphenationAuto(String lang, String country, int leftMin, int rightMin) {
        hyphenator = new Hyphenator(lang, country, leftMin, rightMin);
    }

    /** Gets the hyphen symbol.
     * @return the hyphen symbol
     */    
    public String getHyphenSymbol() {
        return "-";
    }
    
    /** Hyphenates a word and returns the first part of it. To get
     * the second part of the hyphenated word call getHyphenatedWordPost().
     * @param word the word to hyphenate
     * @param font the font used by this word
     * @param fontSize the font size used by this word
     * @param remainingWidth the width available to fit this word in
     * @return the first part of the hyphenated word including
     * the hyphen symbol, if any
     */    
    public String getHyphenatedWordPre(String word, BaseFont font, float fontSize, float remainingWidth) {
        post = word;
        String hyphen = getHyphenSymbol();
        float hyphenWidth = font.getWidthPoint(hyphen, fontSize);
        if (hyphenWidth > remainingWidth)
            return "";
        Hyphenation hyphenation = hyphenator.hyphenate(word);
        if (hyphenation == null) {
            return "";
        }
        int len = hyphenation.length();
        int k;
        for (k = 0; k < len; ++k) {
            if (font.getWidthPoint(hyphenation.getPreHyphenText(k), fontSize) + hyphenWidth > remainingWidth)
                break;
        }
        --k;
        if (k < 0)
            return "";
        post = hyphenation.getPostHyphenText(k);
        return hyphenation.getPreHyphenText(k) + hyphen;
    }
    
    /** Gets the second part of the hyphenated word. Must be called
     * after getHyphenatedWordPre().
     * @return the second part of the hyphenated word
     */    
    public String getHyphenatedWordPost() {
        return post;
    }
    
}