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.Date;
  13 import java.util.LinkedList;
  14 import java.util.Map;
  15 import java.util.regex.Matcher;
  16 import java.util.regex.Pattern;
  17
  18 import org.cacert.gigi.localisation.Language;
  19 import org.cacert.gigi.output.DateSelector;
  20 import org.cacert.gigi.util.HTMLEncoder;
  21
  22 public class Template implements Outputable {
  23
  24     private static class ParseResult {
  25
  26         TemplateBlock block;
  27
  28         String endType;
  29
  30         public ParseResult(TemplateBlock block, String endType) {
  31             this.block = block;
  32             this.endType = endType;
  33         }
  34
  35         public String getEndType() {
  36             return endType;
  37         }
  38
  39         public TemplateBlock getBlock(String reqType) {
  40             if (endType == null && reqType == null) {
  41                 return block;
  42             }
  43             if (endType == null || reqType == null) {
  44                 throw new Error("Invalid block type: " + endType);
  45             }
  46             if (endType.equals(reqType)) {
  47                 return block;
  48             }
  49             throw new Error("Invalid block type: " + endType);
  50         }
  51     }
  52
  53     private TemplateBlock data;
  54
  55     private long lastLoaded;
  56
  57     private File source;
  58
  59     private static final Pattern CONTROL_PATTERN = Pattern.compile(" ?([a-zA-Z]+)\\(\\$([^)]+)\\) ?\\{ ?");
  60
  61     private static final Pattern ELSE_PATTERN = Pattern.compile(" ?\\} ?else ?\\{ ?");
  62
  63     public Template(URL u) {
  64         try {
  65             Reader r = new InputStreamReader(u.openStream(), "UTF-8");
  66             try {
  67                 if (u.getProtocol().equals("file")) {
  68                     source = new File(u.toURI());
  69                     lastLoaded = source.lastModified() + 1000;
  70                 }
  71             } catch (URISyntaxException e) {
  72                 e.printStackTrace();
  73             }
  74             data = parse(r).getBlock(null);
  75             r.close();
  76         } catch (IOException e) {
  77             throw new Error(e);
  78         }
  79     }
  80
  81     public Template(Reader r) {
  82         try {
  83             data = parse(r).getBlock(null);
  84             r.close();
  85         } catch (IOException e) {
  86             throw new Error(e);
  87         }
  88     }
  89
  90     private ParseResult parse(Reader r) throws IOException {
  91         LinkedList<String> splitted = new LinkedList<String>();
  92         LinkedList<Outputable> commands = new LinkedList<Outputable>();
  93         StringBuffer buf = new StringBuffer();
  94         String blockType = null;
  95         outer:
  96         while (true) {
  97             while ( !endsWith(buf, "<?")) {
  98                 int ch = r.read();
  99                 if (ch == -1) {
 100                     break outer;
 101                 }
 102                 buf.append((char) ch);
 103             }
 104             buf.delete(buf.length() - 2, buf.length());
 105             splitted.add(buf.toString());
 106             buf.delete(0, buf.length());
 107             while ( !endsWith(buf, "?>")) {
 108                 int ch = r.read();
 109                 if (ch == -1) {
 110                     throw new EOFException();
 111                 }
 112                 buf.append((char) ch);
 113             }
 114             buf.delete(buf.length() - 2, buf.length());
 115             String com = buf.toString().replace("\n", "");
 116             buf.delete(0, buf.length());
 117             Matcher m = CONTROL_PATTERN.matcher(com);
 118             if (m.matches()) {
 119                 String type = m.group(1);
 120                 String variable = m.group(2);
 121                 ParseResult body = parse(r);
 122                 if (type.equals("if")) {
 123                     if ("else".equals(body.getEndType())) {
 124                         commands.add(new IfStatement(variable, body.getBlock("else"), parse(r).getBlock("}")));
 125                     } else {
 126                         commands.add(new IfStatement(variable, body.getBlock("}")));
 127                     }
 128                 } else if (type.equals("foreach")) {
 129                     commands.add(new ForeachStatement(variable, body.getBlock("}")));
 130                 } else {
 131                     throw new IOException("Syntax error: unknown control structure: " + type);
 132                 }
 133                 continue;
 134             } else if ((m = ELSE_PATTERN.matcher(com)).matches()) {
 135                 blockType = "else";
 136                 break;
 137             } else if (com.matches(" ?\\} ?")) {
 138                 blockType = "}";
 139                 break;
 140             } else {
 141                 commands.add(parseCommand(com));
 142             }
 143         }
 144         splitted.add(buf.toString());
 145         return new ParseResult(new TemplateBlock(splitted.toArray(new String[splitted.size()]), commands.toArray(new Outputable[commands.size()])), blockType);
 146     }
 147
 148     private boolean endsWith(StringBuffer buf, String string) {
 149         return buf.length() >= string.length() && buf.substring(buf.length() - string.length(), buf.length()).equals(string);
 150     }
 151
 152     private Outputable parseCommand(String s2) {
 153         if (s2.startsWith("=_")) {
 154             final String raw = s2.substring(2);
 155             if ( !s2.contains("$") && !s2.contains("!'")) {
 156                 return new TranslateCommand(raw);
 157             } else {
 158                 return new SprintfCommand(raw);
 159             }
 160         } else if (s2.startsWith("=$")) {
 161             final String raw = s2.substring(2);
 162             return new OutputVariableCommand(raw);
 163         } else {
 164             throw new Error("Unknown processing instruction: " + s2);
 165         }
 166     }
 167
 168     @Override
 169     public void output(PrintWriter out, Language l, Map<String, Object> vars) {
 170         if (source != null && 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         data.output(out, l, vars);
 182     }
 183
 184     protected static void outputVar(PrintWriter out, Language l, Map<String, Object> vars, String varname, boolean unescaped) {
 185         Object s = vars.get(varname);
 186
 187         if (s == null) {
 188             System.out.println("Empty variable: " + varname);
 189         }
 190         if (s instanceof Outputable) {
 191             ((Outputable) s).output(out, l, vars);
 192         } else if (s instanceof Date) {
 193             out.print(DateSelector.getDateFormat().format(s));
 194         } else {
 195             out.print(s == null ? "null" : (unescaped ? s.toString() : HTMLEncoder.encodeHTML(s.toString())));
 196         }
 197     }
 198 }