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/*******************************************************************************
* Copyright (c) 2004, 2007 Mylyn project committers and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*******************************************************************************/
package org.eclipse.mylyn.internal.tasks.core;
/**
* Utility class to handle many text quoting scenarios
* <p>
* Each line of text is quoted individually and wrapped, according to the {@link lineSize} attribute
* <p>
* The wrapping policy is the following:
* <p>
* <ol>
* <li>A substring of {@link lineSize} characters is extracted and examined
* <li>If the next character after the substring is a blank space, the substring is quoted
* <li>If don't, the substring is searched backwards for a blank space; if one is found, the substring until the blank
* space is quoted
* <li>If no blank space is found, the entire substring is quoted
* <li>The remaining of substring + line are reevaluated on step 1
* </ol>
*
* @author Willian Mitsuda
*/
public class CommentQuoter {
public static final int DEFAULT_WRAP_SIZE = 80;
private final int lineSize;
public CommentQuoter() {
this(DEFAULT_WRAP_SIZE);
}
public CommentQuoter(int lineSize) {
this.lineSize = lineSize;
}
/**
* Quote a text, wrapping if necessary
*/
public String quote(String text) {
StringBuilder sb = new StringBuilder(text.length() + text.length() / lineSize);
String[] lines = text.split("\n");
for (String line : lines) {
if (line.trim().equals("")) {
sb.append("> \n");
continue;
}
int pos = 0;
while (pos < line.length()) {
int wrapPos = pos + lineSize;
if (wrapPos < line.length()) {
// Try to find a space to wrap the line
while (wrapPos > pos) {
char wrapChar = line.charAt(wrapPos);
if (Character.isSpaceChar(wrapChar)) {
break;
}
wrapPos--;
}
if (wrapPos == pos) {
// There is no space; don't break the line and find the
// next space after the limit...
wrapPos = pos + lineSize;
while (wrapPos < line.length()) {
if (Character.isSpaceChar(line.charAt(wrapPos))) {
break;
}
wrapPos++;
}
}
// Extract the substring and recalculate the next search
// start point
String wrappedLine = line.substring(pos, wrapPos).trim();
sb.append("> " + wrappedLine + "\n");
pos = wrapPos + 1;
} else {
sb.append("> " + line.substring(pos).trim() + "\n");
break;
}
}
}
return sb.toString();
}
}
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