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1
52
53 package freemarker.core;
54
55 import freemarker.template.*;
56
57
60 final class BuiltinVariable extends Expression {
61
62 static final String  NAMESPACE = "namespace";
63 static final String MAIN = "main";
64 static final String GLOBALS = "globals";
65 static final String LOCALS = "locals";
66 static final String DATA_MODEL = "data_model";
67 static final String LANG = "lang";
68 static final String LOCALE = "locale";
69 static final String CURRENT_NODE = "current_node";
70 static final String NODE = "node";
71 static final String PASS = "pass";
72 static final String VARS = "vars";
73 static final String VERSION = "version";
74 static final String ERROR = "error";
75 static final String OUTPUT_ENCODING = "output_encoding";
76 static final String URL_ESCAPING_CHARSET = "url_escaping_charset";
77
78 private final String name;
79
80 BuiltinVariable(String name) throws ParseException {
81 name = name.intern();
82 this.name = name;
83 if (name != NAMESPACE
84 && name != MAIN
85 && name != GLOBALS
86 && name != LOCALS
87 && name != LANG
88 && name != LOCALE
89 && name != DATA_MODEL
90 && name != CURRENT_NODE
91 && name != NODE
92 && name != PASS
93 && name != VARS
94 && name != VERSION
95 && name != OUTPUT_ENCODING
96 && name != URL_ESCAPING_CHARSET
97 && name != ERROR)
98 {
99 throw new ParseException("Unknown built-in variable: " + name, this);
100 }
101 }
102
103 TemplateModel _getAsTemplateModel(Environment env) throws TemplateException {
104 if (name == NAMESPACE) {
105 return env.getCurrentNamespace();
106 }
107 if (name == MAIN) {
108 return env.getMainNamespace();
109 }
110 if (name == GLOBALS) {
111 return env.getGlobalVariables();
112 }
113 if (name == LOCALS) {
114 return env.getCurrentMacroContext().getLocals();
115 }
116 if (name == DATA_MODEL) {
117 return env.getDataModel();
118 }
119 if (name == VARS) {
120 return new VarsHash(env);
121 }
122 if (name == LOCALE) {
123 return new SimpleScalar(env.getLocale().toString());
124 }
125 if (name == LANG) {
126 return new SimpleScalar(env.getLocale().getLanguage());
127 }
128 if (name == CURRENT_NODE || name == NODE) {
129 return env.getCurrentVisitorNode();
130 }
131 if (name == PASS) {
132 return Macro.DO_NOTHING_MACRO;
133 }
134 if (name == VERSION) {
135 return new SimpleScalar(Configuration.getVersionNumber());
136 }
137 if (name == OUTPUT_ENCODING) {
138 String s = env.getOutputEncoding();
139 return s != null ? new SimpleScalar(s) : null;
140 }
141 if (name == URL_ESCAPING_CHARSET) {
142 String s = env.getURLEscapingCharset();
143 return s != null ? new SimpleScalar(s) : null;
144 }
145 if (name == ERROR) {
146 return new SimpleScalar(env.getCurrentRecoveredErrorMesssage());
147 }
148 throw new TemplateException("Invalid built-in variable: " + this, env);
149 }
150
151 public String toString() {
152 return "." + name;
153 }
154
155 public String getCanonicalForm() {
156 return "." + name;
157 }
158
159 boolean isLiteral() {
160 return false;
161 }
162
163 Expression _deepClone(String name, Expression subst) {
164 return this;
165 }
166
167 class VarsHash implements TemplateHashModel {
168
169 Environment env;
170
171 VarsHash(Environment env) {
172 this.env = env;
173 }
174
175 public TemplateModel get(String key) throws TemplateModelException {
176 return env.getVariable(key);
177 }
178
179 public boolean isEmpty() {
180 return false;
181 }
182 }
183 }
184 |
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