Initial check-in.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/trunk@1940 b35dd754-fafc-0310-a699-88a17e54d16e

apps/webchat/source/java/org/jivesoftware/webchat/TextStyle.java

@@ -0,0 +1,126 @@
+/**
+ * $RCSfile$
+ * $Revision$
+ * $Date$
+ *
+ * Copyright (C) 1999-2002 CoolServlets, Inc. All rights reserved.
+ *
+ * This software is the proprietary information of CoolServlets, Inc.
+ * Use is subject to license terms.
+ */
+
+package org.jivesoftware.webchat;
+
+/**
+ * A Filter that replaces [b][/b], [i][/i], [u][/u], [pre][/pre] tags with their HTML
+ * tag equivalents.
+ */
+public class TextStyle {
+
+    public String applyFilter(String string) {
+        if (string == null || string.length() == 0) {
+            return string;
+        }
+
+        // To figure out how many times we've made text replacements, we
+        // need to pass around integer count objects.
+        int[] boldStartCount      = new int[1];
+        int[] italicsStartCount   = new int[1];
+        int[] boldEndCount        = new int[1];
+        int[] italicsEndCount     = new int[1];
+        int[] underlineStartCount = new int[1];
+        int[] underlineEndCount   = new int[1];
+        int[] preformatStartCount = new int[1];
+        int[] preformatEndCount   = new int[1];
+
+        // Bold
+        string = replaceIgnoreCase(string, "[b]", "<b>", boldStartCount);
+        string = replaceIgnoreCase(string, "[/b]", "</b>", boldEndCount);
+        int bStartCount = boldStartCount[0];
+        int bEndCount = boldEndCount[0];
+
+        while (bStartCount > bEndCount) {
+            string = string.concat("</b>");
+            bEndCount++;
+        }
+
+        // Italics
+        string = replaceIgnoreCase(string, "[i]", "<i>", italicsStartCount);
+        string = replaceIgnoreCase(string, "[/i]", "</i>", italicsEndCount);
+        int iStartCount = italicsStartCount[0];
+        int iEndCount = italicsEndCount[0];
+
+        while (iStartCount > iEndCount) {
+            string = string.concat("</i>");
+            iEndCount++;
+        }
+
+        // Underline
+        string = replaceIgnoreCase(string, "[u]", "<u>", underlineStartCount);
+        string = replaceIgnoreCase(string, "[/u]", "</u>", underlineEndCount);
+        int uStartCount = underlineStartCount[0];
+        int uEndCount = underlineEndCount[0];
+
+        while (uStartCount > uEndCount) {
+            string = string.concat("</u>");
+            uEndCount++;
+        }
+
+        // Pre
+        string = replaceIgnoreCase(string, "[pre]", "<pre>", preformatStartCount);
+        string = replaceIgnoreCase(string, "[/pre]", "</pre>", preformatEndCount);
+        int preStartCount = preformatStartCount[0];
+        int preEndCount = preformatEndCount[0];
+
+        while (preStartCount > preEndCount) {
+            string = string.concat("</pre>");
+            preEndCount++;
+        }
+
+        return string;
+    }
+
+    /**
+     * Replaces all instances of oldString with newString in line with the
+     * added feature that matches of newString in oldString ignore case.
+     * The count paramater is set to the number of replaces performed.
+     *
+     * @param line the String to search to perform replacements on
+     * @param oldString the String that should be replaced by newString
+     * @param newString the String that will replace all instances of oldString
+     * @param count a value that will be updated with the number of replaces
+     *      performed.
+     *
+     * @return a String will all instances of oldString replaced by newString
+     */
+    private static final String replaceIgnoreCase(String line, String oldString,
+            String newString, int [] count)
+    {
+        if (line == null) {
+            return null;
+        }
+        String lcLine = line.toLowerCase();
+        String lcOldString = oldString.toLowerCase();
+        int i=0;
+        if ((i=lcLine.indexOf(lcOldString, i)) >= 0) {
+            int counter = 1;
+            char [] line2 = line.toCharArray();
+            char [] newString2 = newString.toCharArray();
+            int oLength = oldString.length();
+            StringBuffer buf = new StringBuffer(line2.length);
+            buf.append(line2, 0, i).append(newString2);
+            i += oLength;
+            int j = i;
+            while ((i=lcLine.indexOf(lcOldString, i)) > 0) {
+                counter++;
+                buf.append(line2, j, i-j).append(newString2);
+                i += oLength;
+                j = i;
+            }
+            buf.append(line2, j, line2.length - j);
+            count[0] = counter;
+            return buf.toString();
+        }
+        return line;
+    }
+}