Source Code Cross Referenced for StringLiteral.java in  » Template-Engine » freemarker-2.3.10 » freemarker » core » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Template Engine » freemarker 2.3.10 » freemarker.core 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (c) 2003 The Visigoth Software Society. All rights
003:         * reserved.
004:         *
005:         * Redistribution and use in source and binary forms, with or without
006:         * modification, are permitted provided that the following conditions
007:         * are met:
008:         *
009:         * 1. Redistributions of source code must retain the above copyright
010:         *    notice, this list of conditions and the following disclaimer.
011:         *
012:         * 2. Redistributions in binary form must reproduce the above copyright
013:         *    notice, this list of conditions and the following disclaimer in
014:         *    the documentation and/or other materials provided with the
015:         *    distribution.
016:         *
017:         * 3. The end-user documentation included with the redistribution, if
018:         *    any, must include the following acknowledgement:
019:         *       "This product includes software developed by the
020:         *        Visigoth Software Society (http://www.visigoths.org/)."
021:         *    Alternately, this acknowledgement may appear in the software itself,
022:         *    if and wherever such third-party acknowledgements normally appear.
023:         *
024:         * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the 
025:         *    project contributors may be used to endorse or promote products derived
026:         *    from this software without prior written permission. For written
027:         *    permission, please contact visigoths@visigoths.org.
028:         *
029:         * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
030:         *    nor may "FreeMarker" or "Visigoth" appear in their names
031:         *    without prior written permission of the Visigoth Software Society.
032:         *
033:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
034:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
035:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
036:         * DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
037:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
038:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
039:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
040:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
041:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
042:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
043:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
044:         * SUCH DAMAGE.
045:         * ====================================================================
046:         *
047:         * This software consists of voluntary contributions made by many
048:         * individuals on behalf of the Visigoth Software Society. For more
049:         * information on the Visigoth Software Society, please see
050:         * http://www.visigoths.org/
051:         */
052:
053:        package freemarker.core;
054:
055:        import freemarker.template.*;
056:        import java.io.*;
057:
058:        final class StringLiteral extends Expression implements 
059:                TemplateScalarModel {
060:
061:            private final String value;
062:            private TemplateElement interpolatedOutput;
063:
064:            StringLiteral(String value) {
065:                this .value = value;
066:            }
067:
068:            void checkInterpolation() throws ParseException {
069:                if (value.indexOf("${") >= 0 || value.indexOf("#{") >= 0) {
070:                    SimpleCharStream scs = new SimpleCharStream(
071:                            new StringReader(value), beginLine,
072:                            beginColumn + 1, value.length());
073:                    FMParserTokenManager token_source = new FMParserTokenManager(
074:                            scs);
075:                    token_source.onlyTextOutput = true;
076:                    FMParser parser = new FMParser(token_source);
077:                    parser.template = getTemplate();
078:                    interpolatedOutput = parser.FreeMarkerText();
079:                    this .constantValue = null;
080:                }
081:            }
082:
083:            TemplateModel _getAsTemplateModel(Environment env)
084:                    throws TemplateException {
085:                return new SimpleScalar(getStringValue(env));
086:            }
087:
088:            public String getAsString() {
089:                return value;
090:            }
091:
092:            String getStringValue(Environment env) throws TemplateException {
093:                if (interpolatedOutput == null) {
094:                    return value;
095:                } else {
096:                    TemplateExceptionHandler teh = env
097:                            .getTemplateExceptionHandler();
098:                    env
099:                            .setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
100:                    try {
101:                        return env.renderElementToString(interpolatedOutput);
102:                    } catch (IOException ioe) {
103:                        throw new TemplateException(ioe, env);
104:                    } finally {
105:                        env.setTemplateExceptionHandler(teh);
106:                    }
107:                }
108:            }
109:
110:            public String getCanonicalForm() {
111:                //        return "\"" + StringUtil.FTLStringLiteralEnc(value) + "\""; 
112:                return "\"" + escapeString(value) + "\"";
113:            }
114:
115:            boolean isLiteral() {
116:                return interpolatedOutput == null;
117:            }
118:
119:            Expression _deepClone(String name, Expression subst) {
120:                StringLiteral cloned = new StringLiteral(value);
121:                cloned.interpolatedOutput = this .interpolatedOutput;
122:                return cloned;
123:            }
124:
125:            static private String escapeString(String s) {
126:                if (s.indexOf('"') == -1) {
127:                    return s;
128:                }
129:                java.util.StringTokenizer st = new java.util.StringTokenizer(s,
130:                        "\"", true);
131:                StringBuffer buf = new StringBuffer();
132:                while (st.hasMoreTokens()) {
133:                    String tok = st.nextToken();
134:                    if (tok.equals("\"")) {
135:                        buf.append('\\');
136:                    }
137:                    buf.append(tok);
138:                }
139:                return buf.toString();
140:            }
141:        }
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