Clover coverage report - groovy - 1.0-beta-7
Coverage timestamp: Wed Sep 29 2004 16:55:52 BST
file stats: LOC: 281   Methods: 10
NCLOC: 140   Classes: 2
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 Source file Conditionals Statements Methods TOTAL
GStringTemplateEngine.java 0% 0% 0% 0%
coverage
 1   
 /* $Id: GStringTemplateEngine.java,v 1.6 2004/07/27 14:23:09 tug Exp $
 2   
 
 3   
 Copyright 2004 (C) John Wilson. All Rights Reserved.
 4   
 
 5   
 Redistribution and use of this software and associated documentation
 6   
 ("Software"), with or without modification, are permitted provided
 7   
 that the following conditions are met:
 8   
 
 9   
 1. Redistributions of source code must retain copyright
 10   
    statements and notices.  Redistributions must also contain a
 11   
    copy of this document.
 12   
 
 13   
 2. Redistributions in binary form must reproduce the
 14   
    above copyright notice, this list of conditions and the
 15   
    following disclaimer in the documentation and/or other
 16   
    materials provided with the distribution.
 17   
 
 18   
 3. The name "groovy" must not be used to endorse or promote
 19   
    products derived from this Software without prior written
 20   
    permission of The Codehaus.  For written permission,
 21   
    please contact info@codehaus.org.
 22   
 
 23   
 4. Products derived from this Software may not be called "groovy"
 24   
    nor may "groovy" appear in their names without prior written
 25   
    permission of The Codehaus. "groovy" is a registered
 26   
    trademark of The Codehaus.
 27   
 
 28   
 5. Due credit should be given to The Codehaus -
 29   
    http://groovy.codehaus.org/
 30   
 
 31   
 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
 32   
 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 33   
 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 34   
 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 35   
 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 36   
 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 37   
 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 38   
 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 39   
 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 40   
 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 41   
 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 42   
 OF THE POSSIBILITY OF SUCH DAMAGE.
 43   
 
 44   
 */
 45   
 package groovy.text;
 46   
 
 47   
 import groovy.lang.*;
 48   
 
 49   
 import java.io.IOException;
 50   
 import java.io.PrintWriter;
 51   
 import java.io.Reader;
 52   
 import java.io.StringWriter;
 53   
 import java.io.Writer;
 54   
 import java.security.AccessController;
 55   
 import java.security.PrivilegedAction;
 56   
 import java.util.Map;
 57   
 
 58   
 import org.codehaus.groovy.control.CompilationFailedException;
 59   
 
 60   
 
 61   
 /**
 62   
 * @author tug@wilson.co.uk
 63   
 *
 64   
 */
 65   
 public class GStringTemplateEngine extends TemplateEngine {
 66   
     /* (non-Javadoc)
 67   
      * @see groovy.text.TemplateEngine#createTemplate(java.io.Reader)
 68   
      */
 69  0
     public Template createTemplate(final Reader reader) throws CompilationFailedException, ClassNotFoundException, IOException {
 70  0
         return new GStringTemplate(reader);
 71   
     }
 72   
     
 73   
     private static class GStringTemplate implements Template {
 74   
         final Closure template;
 75   
         
 76   
         /**
 77   
          * Turn the template into a writable Closure
 78   
          * When executed the closure evaluates all the code embedded in the 
 79   
          * template and then writes a GString containing the fixed and variable items 
 80   
          * to the writer passed as a paramater
 81   
          * 
 82   
          * For example:
 83   
          * 
 84   
          * '<%= "test" %> of expr and <% test = 1 %>${test} script.'
 85   
          * 
 86   
          * would compile into:
 87   
          * 
 88   
          * { |out| out << "${"test"} of expr and "; test = 1 ; out << "${test} script."}.asWritable()
 89   
          * 
 90   
          * @param reader
 91   
          * @throws CompilationFailedException
 92   
          * @throws ClassNotFoundException
 93   
          * @throws IOException
 94   
          */
 95  0
         public GStringTemplate(final Reader reader) throws CompilationFailedException, ClassNotFoundException, IOException {
 96  0
             final StringBuffer templateExpressions = new StringBuffer("package groovy.tmp.templates\nclass C { getTemplate() { { |out| out << \"");
 97  0
             boolean writingString = true;
 98   
        
 99  0
             while(true) {
 100  0
                 int c = reader.read();
 101   
                 
 102  0
                     if (c == -1) break;
 103   
                 
 104  0
                 if (c == '<') {
 105  0
                     c = reader.read();
 106   
                     
 107  0
                     if (c == '%') {
 108  0
                         c = reader.read();
 109   
                         
 110  0
                         if (c == '=') {
 111  0
                                 parseExpression(reader, writingString, templateExpressions);
 112  0
                                 writingString = true;
 113  0
                                 continue;
 114   
                         } else {
 115  0
                                 parseSection(reader, writingString, templateExpressions);
 116  0
                                 writingString = false;
 117  0
                                 continue;
 118   
                         }
 119   
                     } else {
 120  0
                         appendCharacter('<', templateExpressions, writingString);
 121  0
                         writingString = true;
 122   
                     }
 123  0
                 } else if (c == '"') {
 124  0
                         appendCharacter('\\', templateExpressions, writingString);
 125  0
                         writingString = true;
 126   
                    }
 127   
                    
 128  0
                     appendCharacter((char)c, templateExpressions, writingString);
 129  0
                     writingString = true;
 130   
             }
 131   
             
 132  0
             if (writingString) {
 133  0
                     templateExpressions.append("\"");
 134   
             }
 135   
             
 136  0
             templateExpressions.append("}.asWritable()}}");
 137   
             
 138   
 //            System.out.println(templateExpressions.toString());
 139   
             
 140  0
             final ClassLoader parentLoader = getClass().getClassLoader();
 141  0
             final GroovyClassLoader loader = 
 142   
                 (GroovyClassLoader) AccessController.doPrivileged(new PrivilegedAction() {
 143  0
                     public Object run() {
 144  0
                         return new GroovyClassLoader(parentLoader); 
 145   
                     }
 146   
                 });
 147  0
             final Class groovyClass = loader.parseClass(new GroovyCodeSource(templateExpressions.toString(), "C", "x"));
 148   
 
 149  0
             try {
 150  0
                 final GroovyObject object = (GroovyObject) groovyClass.newInstance();
 151   
                 
 152  0
                 this.template = (Closure)object.invokeMethod("getTemplate", null);
 153   
             } catch (InstantiationException e) {
 154  0
                 throw new ClassNotFoundException(e.getMessage());
 155   
             } catch (IllegalAccessException e) {
 156  0
                 throw new ClassNotFoundException(e.getMessage());
 157   
             }
 158   
         }
 159   
         
 160  0
         private static void appendCharacter(final char c,
 161   
                                           final StringBuffer templateExpressions,
 162   
                                           final boolean writingString)
 163   
         {
 164  0
             if (!writingString) {
 165  0
                 templateExpressions.append("out << \"");
 166   
             }
 167   
             
 168  0
             templateExpressions.append(c);
 169   
         }
 170   
         
 171   
         /**
 172   
          * Parse a <% .... %> section
 173   
          * if we are writing a GString close and append ';'
 174   
          * then write the section as a statement
 175   
          * 
 176   
          * @param reader
 177   
          * @param writingString
 178   
          * @param templateExpressions
 179   
          * @throws IOException
 180   
          */
 181  0
         private static void parseSection(final Reader reader,
 182   
                                         final boolean writingString,
 183   
                                          final StringBuffer templateExpressions)
 184   
             throws IOException
 185   
         {
 186  0
             if (writingString) {
 187  0
                 templateExpressions.append("\"; ");
 188   
             }
 189   
             
 190  0
                 while (true) {
 191  0
                     int c = reader.read();
 192   
                     
 193  0
                     if (c == -1) break;
 194   
                     
 195  0
                     if (c =='%') {
 196  0
                         c = reader.read();
 197   
                         
 198  0
                         if (c == '>') break;
 199   
                     }
 200   
                     
 201  0
                     templateExpressions.append((char)c);
 202   
                 }
 203   
                 
 204  0
                 templateExpressions.append("; ");                                
 205   
         }
 206   
         
 207   
         /**
 208   
          * Parse a <%= .... %> expression
 209   
          * 
 210   
          * @param reader
 211   
          * @param writingString
 212   
          * @param templateExpressions
 213   
          * @throws IOException
 214   
          */
 215  0
         private static void parseExpression(final Reader reader,
 216   
                                           final boolean writingString,
 217   
                                           final StringBuffer templateExpressions)
 218   
             throws IOException
 219   
         {
 220  0
             if (!writingString) {
 221  0
                 templateExpressions.append("out << \"");
 222   
             }
 223   
             
 224  0
             templateExpressions.append("${");
 225   
             
 226  0
                 while (true) {
 227  0
                     int c = reader.read();
 228   
                     
 229  0
                     if (c == -1) break;
 230   
                     
 231  0
                     if (c =='%') {
 232  0
                         c = reader.read();
 233   
                         
 234  0
                         if (c == '>') break;
 235   
                     }
 236   
                     
 237  0
                     templateExpressions.append((char)c);
 238   
                 }
 239   
                 
 240  0
             templateExpressions.append('}');
 241   
         }
 242   
 
 243  0
         public Writable make() {
 244  0
            return make(null);
 245   
        }
 246   
 
 247  0
        public Writable make(final Map map) {
 248  0
        final Closure delegatedClosure = (Closure)this.template.clone();
 249   
            
 250  0
            delegatedClosure.setDelegate(new Binding(map));
 251   
            
 252  0
            return new Writable() {
 253   
                /* (non-Javadoc)
 254   
                * @see groovy.lang.Writable#writeTo(java.io.Writer)
 255   
                */
 256  0
                public Writer writeTo(final Writer writer) throws IOException {
 257  0
                    delegatedClosure.call(new Object[] {new PrintWriter(writer)});
 258   
 
 259  0
                    return writer;
 260   
                }
 261   
 
 262   
                /* (non-Javadoc)
 263   
                * @see java.lang.Object#toString()
 264   
                */
 265  0
                public String toString() {
 266  0
                    final StringWriter stringWriter = new StringWriter();
 267   
 
 268  0
                    try {
 269  0
                        writeTo(stringWriter);
 270   
 
 271  0
                        return stringWriter.toString();
 272   
                    } catch (final IOException e) {
 273  0
                        return e.toString();
 274   
                    }
 275   
                }
 276   
 
 277   
            };
 278   
        }
 279   
     }
 280   
 }
 281