001 // License: GPL. Copyright 2007 by Immanuel Scholz and others
002 package org.openstreetmap.josm.tools;
003
004 import java.io.BufferedReader;
005 import java.io.IOException;
006 import java.io.InputStream;
007 import java.io.InputStreamReader;
008 import java.net.URL;
009
010 import org.openstreetmap.josm.Main;
011
012 /**
013 * Read a trac-wiki page.
014 *
015 * @author imi
016 */
017 public class WikiReader {
018
019 private final String baseurl;
020
021 public WikiReader(String baseurl) {
022 this.baseurl = baseurl;
023 }
024
025 public WikiReader() {
026 this.baseurl = Main.pref.get("help.baseurl", "http://josm.openstreetmap.de");
027 }
028
029 /**
030 * Read the page specified by the url and return the content.
031 *
032 * If the url is within the baseurl path, parse it as an trac wikipage and replace relative
033 * pathes etc..
034 *
035 * @throws IOException Throws, if the page could not be loaded.
036 */
037 public String read(String url) throws IOException {
038 BufferedReader in = new BufferedReader(new InputStreamReader(new URL(url).openStream(), "utf-8"));
039 if (url.startsWith(baseurl) && !url.endsWith("?format=txt"))
040 return readFromTrac(in);
041 return readNormal(in);
042 }
043
044 public String readLang(String text) throws IOException {
045 String languageCode = LanguageInfo.getWikiLanguagePrefix();
046 String res = readLang(new URL(baseurl + "/wiki/" + languageCode + text));
047 if (res.isEmpty() && !languageCode.isEmpty()) {
048 res = readLang(new URL(baseurl + "/wiki/" + text));
049 }
050 if (res.isEmpty()) {
051 throw new IOException(text + " does not exist");
052 } else {
053 return res;
054 }
055 }
056
057 private String readLang(URL url) throws IOException {
058 InputStream in = url.openStream();
059 return readFromTrac(new BufferedReader(new InputStreamReader(in, "utf-8")));
060 }
061
062 private String readNormal(BufferedReader in) throws IOException {
063 String b = "";
064 for (String line = in.readLine(); line != null; line = in.readLine()) {
065 if (!line.contains("[[TranslatedPages]]")) {
066 b += line.replaceAll(" />", ">") + "\n";
067 }
068 }
069 return "<html>" + b + "</html>";
070 }
071
072 private String readFromTrac(BufferedReader in) throws IOException {
073 boolean inside = false;
074 boolean transl = false;
075 boolean skip = false;
076 String b = "";
077 for (String line = in.readLine(); line != null; line = in.readLine()) {
078 if (line.contains("<div id=\"searchable\">")) {
079 inside = true;
080 } else if (line.contains("<div class=\"wiki-toc trac-nav\"")) {
081 transl = true;
082 } else if (line.contains("<div class=\"wikipage searchable\">")) {
083 inside = true;
084 } else if (line.contains("<div class=\"buttons\">")) {
085 inside = false;
086 } else if (line.contains("<h3>Attachments</h3>")) {
087 inside = false;
088 } else if (line.contains("<div id=\"attachments\">")) {
089 inside = false;
090 } else if (line.contains("<div class=\"trac-modifiedby\">")) {
091 skip = true;
092 }
093 if (inside && !transl && !skip) {
094 // add a border="0" attribute to images, otherwise the internal help browser
095 // will render a thick border around images inside an <a> element
096 //
097 b += line.replaceAll("<img src=\"/", "<img border=\"0\" src=\"" + baseurl + "/").replaceAll("href=\"/",
098 "href=\"" + baseurl + "/").replaceAll(" />", ">")
099 + "\n";
100 } else if (transl && line.contains("</div>")) {
101 transl = false;
102 }
103 if (line.contains("</div>")) {
104 skip = false;
105 }
106 }
107 if (b.indexOf(" Describe ") >= 0
108 || b.indexOf(" does not exist. You can create it here.</p>") >= 0)
109 return "";
110 return "<html>" + b + "</html>";
111 }
112 }