1 /*
2 * Copyright (c) 2003 The Visigoth Software Society. All rights
3 * reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 *
17 * 3. The end-user documentation included with the redistribution, if
18 * any, must include the following acknowledgement:
19 * "This product includes software developed by the
20 * Visigoth Software Society (http://www.visigoths.org/)."
21 * Alternately, this acknowledgement may appear in the software itself,
22 * if and wherever such third-party acknowledgements normally appear.
23 *
24 * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the
25 * project contributors may be used to endorse or promote products derived
26 * from this software without prior written permission. For written
27 * permission, please contact visigoths@visigoths.org.
28 *
29 * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
30 * nor may "FreeMarker" or "Visigoth" appear in their names
31 * without prior written permission of the Visigoth Software Society.
32 *
33 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
34 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
35 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
36 * DISCLAIMED. IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
37 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
38 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
39 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
40 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
41 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
42 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
43 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44 * SUCH DAMAGE.
45 * ====================================================================
46 *
47 * This software consists of voluntary contributions made by many
48 * individuals on behalf of the Visigoth Software Society. For more
49 * information on the Visigoth Software Society, please see
50 * http://www.visigoths.org/
51 */
52
53 package freemarker.core;
54
55 import java.util.ArrayList;
56 import java.util.Collections;
57 import java.util.Iterator;
58 import java.util.List;
59 import java.util.ListIterator;
60 import freemarker.template;
61 import freemarker.template.utility.Collections12;
62 import java.io.IOException;
63
64 final class ListLiteral extends Expression {
65
66 final ArrayList values;
67
68 ListLiteral(ArrayList values) {
69 this.values = values;
70 values.trimToSize();
71 }
72
73 TemplateModel _getAsTemplateModel(Environment env) throws TemplateException {
74 SimpleSequence list = new SimpleSequence(values.size());
75 for (Iterator it = values.iterator(); it.hasNext();) {
76 Expression exp = (Expression) it.next();
77 TemplateModel tm = exp.getAsTemplateModel(env);
78 assertNonNull(tm, exp, env);
79 list.add(tm);
80 }
81 return list;
82 }
83
84 /**
85 * For the benefit of method calls, return the list of arguments as a list
86 * of values.
87 */
88 List getValueList(Environment env) throws TemplateException {
89 int size = values.size();
90 switch(size) {
91 case 0: {
92 return Collections.EMPTY_LIST;
93 }
94 case 1: {
95 return Collections12.singletonList(((Expression)values.get(0)).getStringValue(env));
96 }
97 default: {
98 List result = new ArrayList(values.size());
99 for (ListIterator iterator = values.listIterator(); iterator.hasNext();) {
100 Expression exp = (Expression)iterator.next();
101 result.add(exp.getStringValue(env));
102 }
103 return result;
104 }
105 }
106 }
107
108 /**
109 * For the benefit of extended method calls, return the list of arguments as a
110 * list of template models.
111 */
112 List getModelList(Environment env) throws TemplateException {
113 int size = values.size();
114 switch(size) {
115 case 0: {
116 return Collections.EMPTY_LIST;
117 }
118 case 1: {
119 return Collections12.singletonList(((Expression)values.get(0)).getAsTemplateModel(env));
120 }
121 default: {
122 List result = new ArrayList(values.size());
123 for (ListIterator iterator = values.listIterator(); iterator.hasNext();) {
124 Expression exp = (Expression)iterator.next();
125 result.add(exp.getAsTemplateModel(env));
126 }
127 return result;
128 }
129 }
130 }
131
132 public String getCanonicalForm() {
133 StringBuffer buf = new StringBuffer("[");
134 int size = values.size();
135 for (int i = 0; i<size; i++) {
136 Expression value = (Expression) values.get(i);
137 buf.append(value.getCanonicalForm());
138 if (i != size-1) {
139 buf.append(",");
140 }
141 }
142 buf.append("]");
143 return buf.toString();
144 }
145
146 boolean isLiteral() {
147 if (constantValue != null) {
148 return true;
149 }
150 for (int i = 0; i<values.size(); i++) {
151 Expression exp = (Expression) values.get(i);
152 if (!exp.isLiteral()) {
153 return false;
154 }
155 }
156 return true;
157 }
158
159 // A hacky routine used by VisitNode and RecurseNode
160
161 TemplateSequenceModel evaluateStringsToNamespaces(Environment env) throws TemplateException {
162 TemplateSequenceModel val = (TemplateSequenceModel) getAsTemplateModel(env);
163 SimpleSequence result = new SimpleSequence(val.size());
164 for (int i=0; i<values.size(); i++) {
165 if (values.get(i) instanceof StringLiteral) {
166 String s = ((StringLiteral) values.get(i)).getAsString();
167 try {
168 Environment.Namespace ns = env.importLib(s, null);
169 result.add(ns);
170 }
171 catch (IOException ioe) {
172 throw new TemplateException("Could not import library '" + s + "', " + ioe.getMessage(), env);
173 }
174 }
175 else {
176 result.add(val.get(i));
177 }
178 }
179 return result;
180 }
181
182 Expression _deepClone(String name, Expression subst) {
183 ArrayList clonedValues = (ArrayList)values.clone();
184 for (ListIterator iter = clonedValues.listIterator(); iter.hasNext();) {
185 iter.set(((Expression)iter.next()).deepClone(name, subst));
186 }
187 return new ListLiteral(clonedValues);
188 }
189
190 }
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