Java String Truncate truncateOnlyText(String text, int position)

Description

Truncate a text with HTML tags up to the given position.

License

Apache License

Parameter

Parameter	Description
text	containing HTML tags.
position	given position.

Return

The returned text should also contain only valid HTML tags. If the text should be truncated in the middle of some text wrapped into the tags, the resulting string should not contain this tag. Example: For text = "You ordered two pizzas with mushrooms and vanilla milkshake." and position = 50, the output should be truncateOnlyText(text, position) = "You ordered two pizzas with mushrooms and vanilla "

Declaration

public static String truncateOnlyText(String text, int position)

Method Source Code

//package com.java2s;
/**//from   www  . jav  a 2 s.c o m
 * Copyright 2015-2016 Debmalya Jash
 * <p/>
 * 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
 * <p/>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p/>
 * 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.
 */

public class Main {
    /**
     * Truncate a text with HTML tags up to the given position. The trick is,
     * the string must be truncated only by the plain text, ignoring tags. For
     * each opening tag there is a closing tag, and there are no nested tags.It
     * is also guaranteed that symbols < and > appear only in HTML tags.
     * 
     * @param text
     *            containing HTML tags.
     * @param position
     *            given position.
     * @return The returned text should also contain only valid HTML tags. If
     *         the text should be truncated in the middle of some text wrapped
     *         into the tags, the resulting string should not contain this tag.
     * 
     *         Example: For text =
     *         "You ordered <b>two</b> pizzas with <i>mushrooms</i> and vanilla <i>milkshake</i>."
     *         and position = 50, the output should be
     * 
     *         truncateOnlyText(text, position) =
     *         "You ordered <b>two</b> pizzas with <i>mushrooms</i> and vanilla "
     */
    public static String truncateOnlyText(String text, int position) {
        StringBuilder t = new StringBuilder();
        int start = 0;
        int end = 0;
        int s = 0;
        int i = 0, l = 0;
        int e = 0;
        char p = ' ';
        for (; i < text.length(); i++) {
            char c = text.charAt((i));
            if (c == '<') {
                s = 1;
                start = i;
            }
            if (s == 0) {
                l++;
            }
            if (l == position) {
                break;
            }
            if (s == 1) {
                t.append(c);
            }
            if (c == '>') {
                s = 0;
                end = i;
                if (e == 1) {
                    t.delete(0, t.length());
                    e = 0;
                }

            }
            if (p == '/' && s == 1) {
                // Beginning of end
                e = 1;
            }
            p = c;
        }

        // What next, any HTML tag?
        String a = "";
        if (i < text.length() - 1) {
            if (text.charAt(i + 1) == '<' && text.charAt(i) != ' ') {
                int j = i + 1;
                p = text.charAt(j);
                while (p != '>') {
                    a += p;
                    j++;
                    p = text.charAt(j);
                }
                a += ">";
            }
        }
        if (t.length() == 0) {
            return text.substring(0, i + 1) + a;
        } else {
            return text.substring(0, start) + text.substring(end + 1, i + 1) + a;
        }
    }
}