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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