Java HTML to String toText(String text)

Description

to Text

License

Open Source License

Declaration

final static public String toText(String text) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    final static public String toText(String text) {
        char[] buf = text.toCharArray();
        StringBuilder b = new StringBuilder(text.length());
        int idx = 0;
        while (idx < buf.length) {
            if (buf[idx] == '<') {
                int endTagPos = 0;
                if (idx + 2 < buf.length && buf[idx + 1] == '!' && buf[idx + 2] == '-') {
                    endTagPos = endTagPosition(buf, idx, 3000, false);
                } else {
                    endTagPos = endTagPosition(buf, idx, 300, false);
                }/* w  ww .j  a  v  a  2  s. c  om*/
                if (endTagPos > 0) {
                    //System.out.println(new String(buf, idx, endTagPos - idx + 1));
                    String string = replaceTag((new String(buf, idx, endTagPos - idx + 1)));
                    if (string != null)
                        b.append(string);
                    idx = endTagPos + 1;
                } else {
                    b.append(buf[idx]);
                    idx++;
                }
            } else {
                b.append(buf[idx]);
                idx++;
            }
        }
        return b.toString();
    }

    private static int endTagPosition(char[] buf, int pos, int maxLookup, boolean ignoreEndSentence) {
        if (pos + 1 == buf.length)
            return -1;
        char nextChar = buf[pos + 1];
        if (ignoreEndSentence && isEndSentenceTag(buf, pos + 1))
            return -1;
        if (nextChar == '!' || nextChar == '/' || Character.isLetter(nextChar)) {
            int limit = pos + maxLookup;
            if (limit > buf.length)
                limit = buf.length;
            for (int i = pos; i < limit; i++) {
                if (buf[i] == '>')
                    return i;
            }
        }
        return -1;
    }

    final static public String replaceTag(String tag) {
        tag = tag.toLowerCase();
        if (tag.startsWith("<p"))
            return " . ";
        else if (tag.startsWith("<br"))
            return " . ";
        else if (tag.startsWith("<tr"))
            return " . ";
        else if (tag.startsWith("<li"))
            return " . ";
        return null;
    }

    private static boolean isEndSentenceTag(char[] buf, int pos) {
        char ch = buf[pos];
        if (ch == 'p' || ch == 'P')
            return true;
        int nextPos = pos + 1;
        if (nextPos == buf.length)
            return false;
        char nextChar = buf[nextPos];
        if (ch == 'b' || ch == 'B') {
            if (nextChar == 'r' || nextChar == 'R')
                return true;
        } else if (ch == 'l' || ch == 'L') {
            if (nextChar == 'i' || nextChar == 'I')
                return true;
        } else if (ch == 't' || ch == 'T') {
            if (nextChar == 'r' || nextChar == 'R')
                return true;
        }
        return false;
    }
}

Related

1. htmlToText(String html)
2. htmlToText(String input)
3. htmlToText(String sHTML)
4. toText(String html)
5. toText(String html)
6. toTextareaInput(String str)