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     class ParseResult {
  24
  25         TemplateBlock block;
  26
  27         String endType;
  28
  29         public ParseResult(TemplateBlock block, String endType) {
  30             this.block = block;
  31             this.endType = endType;
  32         }
  33
  34         public String getEndType() {
  35             return endType;
  36         }
  37
  38         public TemplateBlock getBlock(String reqType) {
  39             if (endType == null && reqType == null) {
  40                 return block;
  41             }
  42             if (endType == null || reqType == null) {
  43                 throw new Error("Invalid block type: " + endType);
  44             }
  45             if (endType.equals(reqType)) {
  46                 return block;
  47             }
  48             throw new Error("Invalid block type: " + endType);
  49         }
  50     }
  51
  52     private TemplateBlock data;
  53
  54     private long lastLoaded;
  55
  56     private File source;
  57
  58     private static final Pattern CONTROL_PATTERN = Pattern.compile(" ?([a-z]+)\\(\\$([^)]+)\\) ?\\{ ?");
  59
  60     private static final Pattern ELSE_PATTERN = Pattern.compile(" ?\\} ?else ?\\{ ?");
  61
  62     public Template(URL u) {
  63         try {
  64             Reader r = new InputStreamReader(u.openStream(), "UTF-8");
  65             try {
  66                 if (u.getProtocol().equals("file") && DevelLauncher.DEVEL) {
  67                     source = new File(u.toURI());
  68                     lastLoaded = source.lastModified() + 1000;
  69                 }
  70             } catch (URISyntaxException e) {
  71                 e.printStackTrace();
  72             }
  73             data = parse(r).getBlock(null);
  74             r.close();
  75         } catch (IOException e) {
  76             throw new Error(e);
  77         }
  78     }
  79
  80     public Template(Reader r) {
  81         try {
  82             data = parse(r).getBlock(null);
  83             r.close();
  84         } catch (IOException e) {
  85             throw new Error(e);
  86         }
  87     }
  88
  89     private ParseResult parse(Reader r) throws IOException {
  90         LinkedList<String> splitted = new LinkedList<String>();
  91         LinkedList<Outputable> commands = new LinkedList<Outputable>();
  92         StringBuffer buf = new StringBuffer();
  93         String blockType = null;
  94         outer:
  95         while (true) {
  96             while ( !endsWith(buf, "<?")) {
  97                 int ch = r.read();
  98                 if (ch == -1) {
  99                     break outer;
 100                 }
 101                 buf.append((char) ch);
 102             }
 103             buf.delete(buf.length() - 2, buf.length());
 104             splitted.add(buf.toString());
 105             buf.delete(0, buf.length());
 106             while ( !endsWith(buf, "?>")) {
 107                 int ch = r.read();
 108                 if (ch == -1) {
 109                     throw new EOFException();
 110                 }
 111                 buf.append((char) ch);
 112             }
 113             buf.delete(buf.length() - 2, buf.length());
 114             String com = buf.toString().replace("\n", "");
 115             buf.delete(0, buf.length());
 116             Matcher m = CONTROL_PATTERN.matcher(com);
 117             if (m.matches()) {
 118                 String type = m.group(1);
 119                 String variable = m.group(2);
 120                 ParseResult body = parse(r);
 121                 if (type.equals("if")) {
 122                     if ("else".equals(body.getEndType())) {
 123                         commands.add(new IfStatement(variable, body.getBlock("else"), parse(r).getBlock("}")));
 124                     } else {
 125                         commands.add(new IfStatement(variable, body.getBlock("}")));
 126                     }
 127                 } else if (type.equals("foreach")) {
 128                     commands.add(new ForeachStatement(variable, body.getBlock("}")));
 129                 } else {
 130                     throw new IOException("Syntax error: unknown control structure: " + type);
 131                 }
 132                 continue;
 133             } else if ((m = ELSE_PATTERN.matcher(com)).matches()) {
 134                 blockType = "else";
 135                 break;
 136             } else if (com.matches(" ?\\} ?")) {
 137                 blockType = "}";
 138                 break;
 139             } else {
 140                 commands.add(parseCommand(com));
 141             }
 142         }
 143         splitted.add(buf.toString());
 144         return new ParseResult(new TemplateBlock(splitted.toArray(new String[splitted.size()]), commands.toArray(new Outputable[commands.size()])), blockType);
 145     }
 146
 147     private boolean endsWith(StringBuffer buf, String string) {
 148         return buf.length() >= string.length() && buf.substring(buf.length() - string.length(), buf.length()).equals(string);
 149     }
 150
 151     private Outputable parseCommand(String s2) {
 152         if (s2.startsWith("=_")) {
 153             final String raw = s2.substring(2);
 154             if ( !s2.contains("$") && !s2.contains("!'")) {
 155                 return new TranslateCommand(raw);
 156             } else {
 157                 return new SprintfCommand(raw);
 158             }
 159         } else if (s2.startsWith("=$")) {
 160             final String raw = s2.substring(2);
 161             return new OutputVariableCommand(raw);
 162         } else {
 163             throw new Error("Unknown processing instruction: " + s2);
 164         }
 165     }
 166
 167     @Override
 168     public void output(PrintWriter out, Language l, Map<String, Object> vars) {
 169         if (source != null && DevelLauncher.DEVEL) {
 170             if (lastLoaded < source.lastModified()) {
 171                 try {
 172                     System.out.println("Reloading template.... " + source);
 173                     InputStreamReader r = new InputStreamReader(new FileInputStream(source), "UTF-8");
 174                     data = parse(r).getBlock(null);
 175                     r.close();
 176                     lastLoaded = source.lastModified() + 1000;
 177                 } catch (IOException e) {
 178                     e.printStackTrace();
 179                 }
 180             }
 181         }
 182         data.output(out, l, vars);
 183     }
 184
 185     protected static void outputVar(PrintWriter out, Language l, Map<String, Object> vars, String varname, boolean unescaped) {
 186         Object s = vars.get(varname);
 187
 188         if (s == null) {
 189             System.out.println("Empty variable: " + varname);
 190         }
 191         if (s instanceof Outputable) {
 192             ((Outputable) s).output(out, l, vars);
 193         } else {
 194             out.print(s == null ? "null" : (unescaped ? s.toString() : HTMLEncoder.encodeHTML(s.toString())));
 195         }
 196     }
 197 }