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1
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.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 interpolatedOutput = parser.FreeMarkerText();
75 this.constantValue = null;
76 }
77 }
78
79 TemplateModel _getAsTemplateModel(Environment env) throws TemplateException {
80 return new SimpleScalar(getStringValue(env));
81 }
82
83 public String getAsString() {
84 return value;
85 }
86
87 String getStringValue(Environment env) throws TemplateException {
88 if (interpolatedOutput == null) {
89 return value;
90 }
91 else {
92 TemplateExceptionHandler teh = env.getTemplateExceptionHandler();
93 env.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
94 try {
95 return env.renderElementToString(interpolatedOutput);
96 }
97 catch (IOException ioe) {
98 throw new TemplateException(ioe, env);
99 }
100 finally {
101 env.setTemplateExceptionHandler(teh);
102 }
103 }
104 }
105
106 public String getCanonicalForm() {
107 return "\"" + escapeString(value) + "\"";
109 }
110
111 boolean isLiteral() {
112 return interpolatedOutput == null;
113 }
114
115 Expression _deepClone(String name, Expression subst) {
116 StringLiteral cloned = new StringLiteral(value);
117 cloned.interpolatedOutput = this.interpolatedOutput;
118 return cloned;
119 }
120
121 static private String escapeString(String s) {
122 if (s.indexOf('"') == -1) {
123 return s;
124 }
125 java.util.StringTokenizer st = new java.util.StringTokenizer (s, "\"", true);
126 StringBuffer buf = new StringBuffer ();
127 while (st.hasMoreTokens()) {
128 String tok = st.nextToken();
129 if (tok.equals("\"")) {
130 buf.append('\\');
131 }
132 buf.append(tok);
133 }
134 return buf.toString();
135 }
136 }
137 |
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