/*
* Copyright (C) 2003-2012 eXo Platform SAS.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.etk.sandbox.bbcode;
/**
* Created by The eXo Platform SAS
* Author : thanh_vucong
* thanh_vucong@exoplatform.com
* Sep 27, 2012
*/
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Stack;
import java.lang.StringBuilder;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
class Main {
public static class BBCode {
public final boolean closing;
public final String tag;
public final String param;
private BBCode(String tag, String param, boolean closing) {
this.tag = tag;
this.closing = closing;
this.param = param;
}
public String toString() {
if (this.closing)
return "[/" + this.tag + "]";
if (this.param != null)
return "[" + this.tag + "=" + this.param + "]";
return "[" + this.tag + "]";
}
private static Pattern openingPattern = Pattern.compile("([a-z]+)");
private static Pattern openingPatternWithParam = Pattern.compile("([a-z]+)=(.*?)");
private static Pattern closingPattern = Pattern.compile("/([a-z]+)");
public static BBCode valueOf(String s) {
Matcher m = openingPattern.matcher(s);
if (m.matches())
return new BBCode(m.group(1), null, false);
m = openingPatternWithParam.matcher(s);
if (m.matches())
return new BBCode(m.group(1), m.group(2), false);
m = closingPattern.matcher(s);
if (m.matches())
return new BBCode(m.group(1), null, true);
return null;
}
}
public static class Node {
public void render(StringBuilder buf) {
}
}
public static class TextNode extends Node {
private String text;
TextNode(String text) {
this.text = text;
}
public void render(StringBuilder buf) {
buf.append(this.text);
}
}
public static class ContainerNode extends Node {
protected ArrayList<Node> children = new ArrayList<Node>();
public void add(Node node) {
this.children.add(node);
}
public void remove(Node node) {
children.remove(node);
}
public void render(StringBuilder buf) {
renderChildren(buf);
}
protected void renderChildren(StringBuilder buf) {
for (Node node : this.children)
node.render(buf);
}
}
public static class RootNode extends ContainerNode {
}
public static class BBCodeNode extends ContainerNode {
protected BBCode bbcode;
public BBCodeNode(BBCode bbcode) {
this.bbcode = bbcode;
}
public boolean isSameTag(BBCode bbcode) {
return this.bbcode.tag.equals(bbcode.tag);
}
public void flushTo(ContainerNode target) {
target.add(new TextNode(this.bbcode.toString()));
for (Node node : this.children)
target.add(node);
}
public void render(StringBuilder buf) {
buf.append("<");
buf.append(this.bbcode.tag);
buf.append(">");
renderChildren(buf);
buf.append("</");
buf.append(this.bbcode.tag);
buf.append(">");
}
}
public static class ColorNode extends BBCodeNode {
public ColorNode(BBCode t) {
super(t);
}
public void render(StringBuilder buf) {
buf.append("<span style='color:");
buf.append(bbcode.param);
buf.append("'>");
renderChildren(buf);
buf.append("</span>");
}
}
public static class BBCodeNodeFactory {
private static HashSet<String> simpleCodes = new HashSet<String>();
static {
simpleCodes.add("b");
simpleCodes.add("i");
simpleCodes.add("s");
simpleCodes.add("u");
}
public static BBCodeNode createNode(BBCode bbcode) {
if (simpleCodes.contains(bbcode.tag))
return new BBCodeNode(bbcode);
if ("color".equals(bbcode.tag))
return new ColorNode(bbcode);
return null;
}
}
public static class BBCodeProcessor {
public static String process(String input) {
BBCodeProcessor processor = new BBCodeProcessor();
processor.parse(input);
StringBuilder buf = new StringBuilder();
processor.render(buf);
return buf.toString();
}
private Stack<ContainerNode> stack = new Stack<ContainerNode>();
private ContainerNode top = new RootNode();
private void parse(String s) {
int len = s.length(), start = 0, i = 0;
while (i < len) {
int b = s.indexOf("[", i);
if (b == -1)
break;
int e = s.indexOf("]", b + 1);
if (e == -1)
break;
BBCode bbcode = BBCode.valueOf(s.substring(b + 1, e));
if (bbcode != null) {
if (start < b)
handleText(s.substring(start, b));
handleBBCode(bbcode);
i = start = e + 1;
} else {
i = b + 1;
}
}
if (start < len)
handleText(s.substring(start));
handleEnd();
}
private void handleText(String text) {
top.add(new TextNode(text));
}
private void handleBBCode(BBCode bbcode) {
if (bbcode.closing)
handleClosing(bbcode);
else
handleOpening(bbcode);
}
private void handleOpening(BBCode bbcode) {
BBCodeNode node = BBCodeNodeFactory.createNode(bbcode);
if (node == null) {
handleText(bbcode.toString());
} else {
stack.push(top);
top = node;
}
}
private void handleClosing(BBCode bbcode) {
while (!stack.isEmpty()) {
BBCodeNode top = (BBCodeNode) this.top;
ContainerNode node = stack.pop();
this.top = node;
if (top.isSameTag(bbcode)) {
node.add(top);
this.top = node;
return;
}
top.flushTo(node);
}
top.add(new TextNode(bbcode.toString()));
}
private void handleEnd() {
while (!stack.isEmpty()) {
ContainerNode node = stack.pop();
((BBCodeNode) top).flushTo(node);
top = node;
}
}
private void render(StringBuilder buf) {
top.render(buf);
}
}
public static void main(String args[]) {
java.io.BufferedReader r = new java.io.BufferedReader(new java.io.InputStreamReader(System.in));
String s;
try {
while ((s = r.readLine()) != null) {
System.out.println(s + " -> " + BBCodeProcessor.process(s));
}
} catch (Exception e) {
}
}
}