src/org/cacert/gigi/output/template/Template.java

   1 package org.cacert.gigi.output.template;
   2
   3 import java.io.EOFException;
   4 import java.io.File;
   5 import java.io.FileInputStream;
   6 import java.io.IOException;
   7 import java.io.InputStreamReader;
   8 import java.io.PrintWriter;
   9 import java.io.Reader;
  10 import java.net.URISyntaxException;
  11 import java.net.URL;
  12 import java.util.LinkedList;
  13 import java.util.Map;
  14 import java.util.regex.Matcher;
  15 import java.util.regex.Pattern;
  16
  17 import org.cacert.gigi.DevelLauncher;
  18 import org.cacert.gigi.localisation.Language;
  19 import org.cacert.gigi.util.HTMLEncoder;
  20
  21 public class Template implements Outputable {
  22
  23     private TemplateBlock data;
  24
  25     private long lastLoaded;
  26
  27     private File source;
  28
  29     private static final Pattern CONTROL_PATTERN = Pattern.compile(" ?([a-z]+)\\(\\$([^)]+)\\) ?\\{ ?");
  30
  31     public Template(URL u) {
  32         try {
  33             Reader r = new InputStreamReader(u.openStream(), "UTF-8");
  34             try {
  35                 if (u.getProtocol().equals("file") && DevelLauncher.DEVEL) {
  36                     source = new File(u.toURI());
  37                     lastLoaded = source.lastModified() + 1000;
  38                 }
  39             } catch (URISyntaxException e) {
  40                 e.printStackTrace();
  41             }
  42             data = parse(r);
  43             r.close();
  44         } catch (IOException e) {
  45             throw new Error(e);
  46         }
  47     }
  48
  49     public Template(Reader r) {
  50         try {
  51             data = parse(r);
  52             r.close();
  53         } catch (IOException e) {
  54             throw new Error(e);
  55         }
  56     }
  57
  58     private TemplateBlock parse(Reader r) throws IOException {
  59         LinkedList<String> splitted = new LinkedList<String>();
  60         LinkedList<Outputable> commands = new LinkedList<Outputable>();
  61         StringBuffer buf = new StringBuffer();
  62         outer:
  63         while (true) {
  64             while ( !endsWith(buf, "<?")) {
  65                 int ch = r.read();
  66                 if (ch == -1) {
  67                     break outer;
  68                 }
  69                 buf.append((char) ch);
  70             }
  71             buf.delete(buf.length() - 2, buf.length());
  72             splitted.add(buf.toString());
  73             buf.delete(0, buf.length());
  74             while ( !endsWith(buf, "?>")) {
  75                 int ch = r.read();
  76                 if (ch == -1) {
  77                     throw new EOFException();
  78                 }
  79                 buf.append((char) ch);
  80             }
  81             buf.delete(buf.length() - 2, buf.length());
  82             String com = buf.toString().replace("\n", "");
  83             buf.delete(0, buf.length());
  84             Matcher m = CONTROL_PATTERN.matcher(com);
  85             if (m.matches()) {
  86                 String type = m.group(1);
  87                 String variable = m.group(2);
  88                 TemplateBlock body = parse(r);
  89                 if (type.equals("if")) {
  90                     commands.add(new IfStatement(variable, body));
  91                 } else if (type.equals("foreach")) {
  92                     commands.add(new ForeachStatement(variable, body));
  93                 } else {
  94                     throw new IOException("Syntax error: unknown control structure: " + type);
  95                 }
  96                 continue;
  97             }
  98             if (com.matches(" ?\\} ?")) {
  99                 break;
 100             }
 101             commands.add(parseCommand(com));
 102         }
 103         splitted.add(buf.toString());
 104         String[] contents = splitted.toArray(new String[splitted.size()]);
 105         Outputable[] vars = commands.toArray(new Outputable[commands.size()]);
 106         return new TemplateBlock(contents, vars);
 107     }
 108
 109     private boolean endsWith(StringBuffer buf, String string) {
 110         return buf.length() >= string.length() && buf.substring(buf.length() - string.length(), buf.length()).equals(string);
 111     }
 112
 113     private Outputable parseCommand(String s2) {
 114         if (s2.startsWith("=_")) {
 115             final String raw = s2.substring(2);
 116             return new TranslateCommand(raw);
 117         } else if (s2.startsWith("=$")) {
 118             final String raw = s2.substring(2);
 119             return new OutputVariableCommand(raw);
 120         } else if (s2.startsWith("=s,")) {
 121             String command = s2.substring(3);
 122             final LinkedList<String> store = new LinkedList<String>();
 123             while (command.startsWith("$") || command.startsWith("\"") || command.startsWith("!\"")) {
 124                 int idx;
 125                 if (command.startsWith("\"") || command.startsWith("!\"")) {
 126                     idx = command.indexOf("\"", command.charAt(0) == '!' ? 2 : 1) + 1;
 127                     store.add(command.substring(0, idx - 1));
 128                 } else {
 129                     idx = command.indexOf(",");
 130                     store.add(command.substring(0, idx));
 131                 }
 132                 command = command.substring(idx + 1);
 133             }
 134             final String text = command;
 135             return new SprintfCommand(text, store);
 136         } else {
 137             System.out.println("Unknown processing instruction: " + s2);
 138         }
 139         return null;
 140     }
 141
 142     @Override
 143     public void output(PrintWriter out, Language l, Map<String, Object> vars) {
 144         if (source != null && DevelLauncher.DEVEL) {
 145             if (lastLoaded < source.lastModified()) {
 146                 try {
 147                     System.out.println("Reloading template.... " + source);
 148                     InputStreamReader r = new InputStreamReader(new FileInputStream(source), "UTF-8");
 149                     data = parse(r);
 150                     r.close();
 151                     lastLoaded = source.lastModified() + 1000;
 152                 } catch (IOException e) {
 153                     e.printStackTrace();
 154                 }
 155             }
 156         }
 157         data.output(out, l, vars);
 158     }
 159
 160     protected static void outputVar(PrintWriter out, Language l, Map<String, Object> vars, String varname, boolean unescaped) {
 161         Object s = vars.get(varname);
 162
 163         if (s == null) {
 164             System.out.println("Empty variable: " + varname);
 165         }
 166         if (s instanceof Outputable) {
 167             ((Outputable) s).output(out, l, vars);
 168         } else {
 169             out.print(s == null ? "null" : (unescaped ? s.toString() : HTMLEncoder.encodeHTML(s.toString())));
 170         }
 171     }
 172 }