/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 *

 * ident	"@(#)TextUtil.java	1.10	08/05/11 SMI"

 */

package org.opensolaris.os.vp.util;

import java.util.*;

import java.util.regex.*;

public class TextUtil {

    //

    // Static methods

    //

    /**

     * Returns the base portion of a fully-qualified class name.

     */

    public static String getClassBaseName(String className) {

	return className.replaceFirst(".*\\.", "");

    }

    /**

     * Returns the base portion of a fully-qualified class name.

     */

    public static String getClassBaseName(Class clazz) {

	return getClassBaseName(clazz.getName());

    }

    /**

     * Returns the package portion of a fully-qualified class name.

     */

	return name.replaceFirst("\\.?\\.*[^.]*$", "");

    }

    /**

     * Returns the package portion of a fully-qualified class name.

     */

    }

    /**

     * Returns a random alpha {@code String} with length between {@code minLen}

     * and {@code maxLen}.

     */

    public static String getRandomAlphaString(int minLen, int maxLen) {

	StringBuffer buffer = new StringBuffer();

	int length = (int)(Math.random() * (maxLen - minLen + 1)) + minLen;

	for (int j = 0; j < length; j++) {

	    char c = (char)((Math.random() * 26) + 97);

	    buffer.append(c);

	}

	return buffer.toString();

    }

    /**

     * Replace characters with special meaning to HTML with their HTML entity

     * equivalents.

     */

    public static String escapeHTMLChars(String text) {

	StringBuffer buffer = new StringBuffer();

	for (char c : text.toCharArray()) {

	    switch (c) {

		case '<':

		    buffer.append("<");

		    break;

		case '>':

		    buffer.append(">");

		    break;

		case '\"':

		    buffer.append(""");

		    break;

		case '\'':

		    buffer.append("'");

		    break;

		case '\\':

		    buffer.append("\");

		    break;

		case '&':

		    buffer.append("&");

		    break;

		case '\n':

		    buffer.append("<br/>");

		    break;

		default:

		    buffer.append(c);

	    }

	}

	return buffer.toString();

    }

    /**

     * Splits the given string into lines.

     *

     * @param	    text

     *		    the text to format

     *

     * @param	    width

     *		    the maximum width of each line

     *

     * @param	    forceBreak

     *		    whether to force a break in the middle of a word

     *		    if the length of the word is greater than

     *		    <code>width</code>

     *

     * @return	    a wrapped string separated by newlines

     */

    public static String format(String text, int width, boolean forceBreak) {

	if (text == null) {

	    return text;

	}

	// Replace newlines

	text = text.replaceAll("\\s*[\\r\\n]\\s*", " ");

	StringBuffer buffer = new StringBuffer();

	int w = width;

	if (w < 1) {

	    w = 1;

	}

	for (int i = 0; text.length() > 0; i++) {

	    String regex = "^\\s*(.{1," + w + "})($|\\s+.*)";

	    String[] groups = match(text, regex);

	    if (groups == null) {

		// Can't break line on whitespace without exceeding width

		if (forceBreak) {

		    // Break line in middle of word

		    regex = "^\\s*(.{1," + w + "})(.*)";

		} else {

		    // Break line at next whitespace

		    regex = "^\\s*(.+?)($|\\s+.*)";

		}

		groups = match(text, regex);

	    }

	    if (i != 0) {

		buffer.append("\n");

	    }

	    buffer.append(groups[1].trim());

	    text = groups[2];

	    if (i == 0) {

		w = width;

		if (w < 1) {

		    w = 1;

		}

	    }

	}

	return buffer.toString();

    }

    public static boolean isPrintable(char c) {

	return c >= 32 && c <= 126;

    }

    public static String join(String delim, Object... list) {

	StringBuffer buffer = new StringBuffer();

	for (int i = 0; i < list.length; i++) {

	    if (i != 0 && delim != null) {

		buffer.append(delim);

	    }

	    buffer.append(list[i]);

	}

	return buffer.toString();

    }

    public static String join(String delim, byte... list) {

	Byte[] array = new Byte[list.length];

	for (int i = 0; i < array.length; i++) {

	    array[i] = list[i];

	}

	return join(delim, (Object[])array);

    }

    public static String join(String delim, char... list) {

	Character[] array = new Character[list.length];

	for (int i = 0; i < array.length; i++) {

	    array[i] = list[i];

	}

	return join(delim, (Object[])array);

    }

    public static String join(String delim, double... list) {

	Double[] array = new Double[list.length];

	for (int i = 0; i < array.length; i++) {

	    array[i] = list[i];

	}

	return join(delim, (Object[])array);

    }

    public static String join(String delim, float... list) {

	Float[] array = new Float[list.length];

	for (int i = 0; i < array.length; i++) {

	    array[i] = list[i];

	}

	return join(delim, (Object[])array);

    }

    public static String join(String delim, int... list) {

	Integer[] array = new Integer[list.length];

	for (int i = 0; i < array.length; i++) {

	    array[i] = list[i];

	}

	return join(delim, (Object[])array);

    }

    public static String join(String delim, long... list) {

	Long[] array = new Long[list.length];

	for (int i = 0; i < array.length; i++) {

	    array[i] = list[i];

	}

	return join(delim, (Object[])array);

    }

    public static String join(String delim, short... list) {

	Short[] array = new Short[list.length];

	for (int i = 0; i < array.length; i++) {

	    array[i] = list[i];

	}

	return join(delim, (Object[])array);

    }

    public static String join(String delim, Collection list) {

	return join(delim, list.toArray());

    }

    /**

     * Matches the given string against the given regular expression,

     * returning an array of the matched regular expression groups.

     *

     * @param	    text

     *		    the String to which to apply the regular

     *		    expression

     *

     * @param	    regex

     *		    a regular expression containing groups

     *

     * @return	    an array of the matched regular expression groups

     *		    (group 0 is the entire pattern), if the given

     *		    pattern matched, or {@code null} if the

     *		    pattern did not match

     *

     * @exception   PatternSyntaxException

     *		    if the given pattern was malformed

     */

    public static String[] match(String text, String regex)

	throws PatternSyntaxException {

	Matcher matcher = Pattern.compile(regex).matcher(text);

	if (!matcher.matches()) {

	    return null;

	}

	String[] groups = new String[matcher.groupCount() + 1];

	for (int i = 0; i < groups.length; i++) {

	    groups[i] = matcher.group(i);

	}

	return groups;

    }

    /**

     * Splits the given text into fields.

     *

     * @param	    delim

     *		    the regular expression delimiter for each field

     *

     * @param	    text

     *		    the text to split

     *

     * @param	    quotes

     *		    the characters that indicate a grouping of text,

     *		    eg. single quotes ("<code>'</code>") or double

     *		    quotes ("<code>"</code>"), etc., or

     *		    <code>null</code> for no quotes

     *

     * @param	    quoteEsc

     *		    an expression that can precede a quote character

     *		    so that it is interpreted normally, rather than as

     *		    a quote character, or <code>null</code> if no such

     *		    escape character is used

     *

     * @return	    the resulting fields

     */

    public static String[] split(

	String delim, String text, String quotes, String quoteEsc) {

	// Create the matching regular expression

	int ngroups = 0;

	int quoteGroup = -1;

	int quoteEscGroup = -1;

	StringBuffer reBuffer = new StringBuffer("^(.*?)(");

	int fieldGroup = ++ngroups;

	ngroups++;

	if (quotes != null) {

	    if (quoteEsc != null) {

		reBuffer.append("(\\Q").append(quoteEsc).append("\\E").

		    append("[").append(quotes).append("])|");

		quoteEscGroup = ++ngroups;

	    }

	    reBuffer.append("([").append(quotes).append("])|");

	    quoteGroup = ++ngroups;

	}

	reBuffer.append("(").append(delim).append("))(.*)");

	int delimGroup = ++ngroups;

	int textGroup = ++ngroups;

	String regex = reBuffer.toString();

	List<String> fields = new ArrayList<String>();

	// Build the field

	StringBuffer field = new StringBuffer();

	boolean inQuote = false;

	String curQuote = null;

	while (text != null && text.length() > 0) {

	    String[] groups = match(text, regex);

	    if (groups == null) {

		field.append(text);

		text = null;

	    } else {

		field.append(groups[fieldGroup]);

		// Remaining text

		text = groups[textGroup];

		// Was a delimiter reached?

		if (groups[delimGroup] != null) {

		    if (inQuote) {

			field.append(groups[delimGroup]);

		    } else {

			fields.add(field.toString());

			field.setLength(0);

		    }

		} else

		try {

		    String quote = groups[quoteGroup];

		   // Was a quote reached?

		    if (quote != null) {

			if (inQuote) {

			    if (quote.equals(curQuote)) {

				inQuote = false;

			    } else {

				field.append(quote);

			    }

			} else {

			    inQuote = true;

			    curQuote = quote;

			}

		    } else

		    // Was an escaped quote reached?

		    if (groups[quoteEscGroup] != null) {

			field.append(quotes);

		    }

		}

		catch (ArrayIndexOutOfBoundsException ignore) {}

	    }

	}

	fields.add(field.toString());

	return fields.toArray(new String[fields.size()]);

    }

}