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    1   package org.codehaus.groovy.sandbox.markup;
    2   /*
    3
    4   Copyright 2004 (C) John Wilson. All Rights Reserved.
    5
    6   Redistribution and use of this software and associated documentation
    7   ("Software"), with or without modification, are permitted provided
    8   that the following conditions are met:
    9
    10  1. Redistributions of source code must retain copyright
    11     statements and notices.  Redistributions must also contain a
    12     copy of this document.
    13
    14  2. Redistributions in binary form must reproduce the
    15     above copyright notice, this list of conditions and the
    16     following disclaimer in the documentation and/or other
    17     materials provided with the distribution.
    18
    19  3. The name "groovy" must not be used to endorse or promote
    20     products derived from this Software without prior written
    21     permission of The Codehaus.  For written permission,
    22     please contact info@codehaus.org.
    23
    24  4. Products derived from this Software may not be called "groovy"
    25     nor may "groovy" appear in their names without prior written
    26     permission of The Codehaus. "groovy" is a registered
    27     trademark of The Codehaus.
    28
    29  5. Due credit should be given to The Codehaus -
    30     http://groovy.codehaus.org/
    31
    32  THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
    33  ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
    34  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
    35  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
    36  THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
    37  INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    38  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
    39  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    40  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
    41  STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    42  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
    43  OF THE POSSIBILITY OF SUCH DAMAGE.
    44
    45  */
    46
    47  import groovy.lang.Closure;
    48
    49  import java.util.Collections;
    50  import java.util.HashMap;
    51  import java.util.Map;
    52
    53  public class BaseMarkupBuilder extends Builder {
    54  	public BaseMarkupBuilder(final Map namespaceMethodMap) {
    55  		super(namespaceMethodMap);
    56  	}
    57
    58  	public Object bind(final Closure root) {
    59  		return new Document(root, this.namespaceMethodMap);
    60  	}
    61
    62  	private static class Document extends Built {
    63  		private Object out;
    64  		private final Map pendingNamespaces = new HashMap();
    65  		private final Map namespaces = new HashMap();
    66  		private String prefix = "";
    67
    68  		public Document(final Closure root, final Map namespaceMethodMap) {
    69  			super(root, namespaceMethodMap);
    70
    71  			this.namespaces.put("xml", "http://www.w3.org/XML/1998/namespace");				// built in namespace
    72  			this.namespaces.put("mkp", "http://www.codehaus.org/Groovy/markup/keywords");	// pseudo namespace for markup keywords
    73  		}
    74
    75  		/* (non-Javadoc)
    76  		 * @see groovy.lang.GroovyObject#invokeMethod(java.lang.String, java.lang.Object)
    77  		 */
    78  		public Object invokeMethod(final String name, final Object args) {
    79  			final Object[] arguments = (Object[]) args;
    80  			Map attrs = Collections.EMPTY_MAP;
    81  			Object body = null;
    82
    83
    84  			//
    85  			// Sort the parameters out
    86  			//
    87  			for (int i = 0; i != arguments.length; i++) {
    88  				final Object arg = arguments[i];
    89
    90  				if (arg instanceof Map) {
    91  					attrs = (Map)arg;
    92  				} else if (arg instanceof Closure) {
    93  					final Closure c = ((Closure) arg);
    94
    95  					c.setDelegate(this);
    96  					body = c.asWritable();
    97  				} else {
    98  					body = arg;
    99  				}
    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 }