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 freemarker.template;
56 import java.io;
57
58 final class StringLiteral extends Expression implements TemplateScalarModel {
59
60 private final String value;
61 private TemplateElement interpolatedOutput;
62
63 StringLiteral(String value) {
64 this.value = value;
65 }
66
67 void checkInterpolation() throws ParseException {
68 if (value.length() > 3 && (value.indexOf("${") >= 0 || value.indexOf("#{") >= 0)) {
69 SimpleCharStream scs = new SimpleCharStream(new StringReader(value), beginLine, beginColumn+1, value.length());
70 FMParserTokenManager token_source = new FMParserTokenManager(scs);
71 token_source.onlyTextOutput = true;
72 FMParser parser = new FMParser(token_source);
73 parser.template = getTemplate();
74 try {
75 interpolatedOutput = parser.FreeMarkerText();
76 }
77 catch(ParseException e) {
78 e.setTemplateName(getTemplate().getName());
79 throw e;
80 }
81 this.constantValue = null;
82 }
83 }
84
85 TemplateModel _getAsTemplateModel(Environment env) throws TemplateException {
86 return new SimpleScalar(getStringValue(env));
87 }
88
89 public String getAsString() {
90 return value;
91 }
92
93 String getStringValue(Environment env) throws TemplateException {
94 if (interpolatedOutput == null) {
95 return value;
96 }
97 else {
98 TemplateExceptionHandler teh = env.getTemplateExceptionHandler();
99 env.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
100 try {
101 return env.renderElementToString(interpolatedOutput);
102 }
103 catch (IOException ioe) {
104 throw new TemplateException(ioe, env);
105 }
106 finally {
107 env.setTemplateExceptionHandler(teh);
108 }
109 }
110 }
111
112 public String getCanonicalForm() {
113 // return "\"" + StringUtil.FTLStringLiteralEnc(value) + "\"";
114 return "\"" + escapeString(value) + "\"";
115 }
116
117 boolean isLiteral() {
118 return interpolatedOutput == null;
119 }
120
121 Expression _deepClone(String name, Expression subst) {
122 StringLiteral cloned = new StringLiteral(value);
123 cloned.interpolatedOutput = this.interpolatedOutput;
124 return cloned;
125 }
126
127 static private String escapeString(String s) {
128 if (s.indexOf('"') == -1) {
129 return s;
130 }
131 java.util.StringTokenizer st = new java.util.StringTokenizer(s, "\"", true);
132 StringBuffer buf = new StringBuffer();
133 while (st.hasMoreTokens()) {
134 String tok = st.nextToken();
135 if (tok.equals("\"")) {
136 buf.append('\\');
137 }
138 buf.append(tok);
139 }
140 return buf.toString();
141 }
142 }
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