001    package org.codehaus.groovy.sandbox.markup;
002    /*
003    
004    Copyright 2004 (C) John Wilson. All Rights Reserved.
005    
006    Redistribution and use of this software and associated documentation
007    ("Software"), with or without modification, are permitted provided
008    that the following conditions are met:
009    
010    1. Redistributions of source code must retain copyright
011       statements and notices.  Redistributions must also contain a
012       copy of this document.
013    
014    2. Redistributions in binary form must reproduce the
015       above copyright notice, this list of conditions and the
016       following disclaimer in the documentation and/or other
017       materials provided with the distribution.
018    
019    3. The name "groovy" must not be used to endorse or promote
020       products derived from this Software without prior written
021       permission of The Codehaus.  For written permission,
022       please contact info@codehaus.org.
023    
024    4. Products derived from this Software may not be called "groovy"
025       nor may "groovy" appear in their names without prior written
026       permission of The Codehaus. "groovy" is a registered
027       trademark of The Codehaus.
028    
029    5. Due credit should be given to The Codehaus -
030       http://groovy.codehaus.org/
031    
032    THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
033    ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
034    NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
035    FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
036    THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
037    INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
038    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
039    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
040    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
041    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
042    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
043    OF THE POSSIBILITY OF SUCH DAMAGE.
044    
045    */
046    
047    import groovy.lang.Closure;
048    
049    import java.util.Collections;
050    import java.util.HashMap;
051    import java.util.Map;
052    
053    public class BaseMarkupBuilder extends Builder {
054            public BaseMarkupBuilder(final Map namespaceMethodMap) {
055                    super(namespaceMethodMap);
056            }
057            
058            public Object bind(final Closure root) {
059                    return new Document(root, this.namespaceMethodMap);
060            }
061            
062            private static class Document extends Built {
063                    private Object out;
064                    private final Map pendingNamespaces = new HashMap();
065                    private final Map namespaces = new HashMap();
066                    private String prefix = "";
067                    
068                    public Document(final Closure root, final Map namespaceMethodMap) {
069                            super(root, namespaceMethodMap);
070                            
071                            this.namespaces.put("xml", "http://www.w3.org/XML/1998/namespace");                             // built in namespace
072                            this.namespaces.put("mkp", "http://www.codehaus.org/Groovy/markup/keywords");   // pseudo namespace for markup keywords
073                    }
074                    
075                    /* (non-Javadoc)
076                     * @see groovy.lang.GroovyObject#invokeMethod(java.lang.String, java.lang.Object)
077                     */
078                    public Object invokeMethod(final String name, final Object args) {
079                            final Object[] arguments = (Object[]) args;
080                            Map attrs = Collections.EMPTY_MAP;
081                            Object body = null;
082                            
083                            
084                            //
085                            // Sort the parameters out
086                            //
087                            for (int i = 0; i != arguments.length; i++) {
088                                    final Object arg = arguments[i];
089                                    
090                                    if (arg instanceof Map) {
091                                            attrs = (Map)arg;
092                                    } else if (arg instanceof Closure) {
093                                            final Closure c = ((Closure) arg);
094                                            
095                                            c.setDelegate(this);
096                                            body = c.asWritable();
097                                    } else {
098                                            body = arg;
099                                    }
100                            }
101                            
102                            //
103                            // call the closure corresponding to the tag
104                            //
105                            final Object uri;
106                            
107                            if (this.pendingNamespaces.containsKey(this.prefix)) {
108                                    uri = this.pendingNamespaces.get(this.prefix);
109                            } else if (this.namespaces.containsKey(this.prefix)) {
110                                    uri = this.namespaces.get(this.prefix);
111                            } else {
112                                    uri = ":";
113                            }
114                            
115                            final Object[] info  = (Object[])this.namespaceSpecificTags.get(uri);
116                            final Map tagMap = (Map)info[2];
117                            final Closure defaultTagClosure = (Closure)info[0];
118                            
119                            final String prefix = this.prefix;
120                            this.prefix = "";
121                            
122                            if (tagMap.containsKey(name)) {
123                                    return ((Closure)tagMap.get(name)).call(new Object[]{this, this.pendingNamespaces, this.namespaces, this.namespaceSpecificTags, prefix, attrs, body, this.out});
124                            } else {
125                                    return defaultTagClosure.call(new Object[]{name, this, this.pendingNamespaces, this.namespaces, this.namespaceSpecificTags, prefix, attrs, body, this.out});            
126                            }
127                    }
128                    
129                    /* (non-Javadoc)
130                     * @see groovy.lang.GroovyObject#getProperty(java.lang.String)
131                     */
132                    public Object getProperty(final String property) {
133                            this.prefix = property;
134                            return this;
135                    }
136                    
137                    /* (non-Javadoc)
138                     * @see groovy.lang.GroovyObject#setProperty(java.lang.String, java.lang.Object)
139                     */
140                    public void setProperty(String property, Object newValue) {
141                            if ("trigger".equals(property)) {
142                                    this.out = newValue;
143                                    this.root.call();
144                            } else {
145                                    super.setProperty(property, newValue);
146                            }
147                    }
148            }
149    }