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1
52
53 package freemarker.core;
54
55 import freemarker.template.*;
56
57
61 final class Assignment extends TemplateElement {
62
63 private String  variableName;
64 private Expression value, namespaceExp;
65 private int scope;
66
67 static final int NAMESPACE = 1;
68 static final int LOCAL = 2;
69 static final int GLOBAL = 3;
70
71
76 Assignment(String variableName,
77 Expression value,
78 int scope)
79 {
80 this.variableName = variableName;
81 this.value = value;
82 this.scope = scope;
83 }
84
85 void setNamespaceExp(Expression namespaceExp) {
86 this.namespaceExp = namespaceExp;
87 }
88
89 void accept(Environment env) throws TemplateException {
90 TemplateModel tm = value.getAsTemplateModel(env);
91 Environment.Namespace namespace = null;
92 if (namespaceExp != null) {
93 boolean oops = false;
94 try {
95 namespace = (Environment.Namespace) namespaceExp.getAsTemplateModel(env);
96 } catch (ClassCastException cce) {
97 oops = true;
98 }
99 if (oops || namespace==null) {
100 throw new InvalidReferenceException(getStartLocation() + "\nInvalid reference to namespace: " + namespaceExp, env);
101 }
102 }
103 if (tm == null) {
104 if (env.isClassicCompatible()) {
105 tm = TemplateScalarModel.EMPTY_STRING;
106 }
107 else {
108 String msg = "Error " + getStartLocation()
109 +"\n" + value + " is undefined."
110 +"\nIt cannot be assigned to " + variableName;
111 throw new InvalidReferenceException(msg, env);
112 }
113 }
114 if (scope == LOCAL) {
115 env.setLocalVariable(variableName, tm);
116 }
117 else {
118 if (namespace == null) {
119 if (scope == GLOBAL) {
120 namespace = env.getGlobalNamespace();
121 }
122 else if (scope == NAMESPACE) {
123 namespace = env.getCurrentNamespace();
124 }
125 }
126 namespace.put(variableName, tm);
127 }
128 }
129
130 public String getCanonicalForm() {
131 StringBuffer buf = new StringBuffer ();
132 if (!(parent instanceof AssignmentInstruction)) {
133 if (scope == LOCAL) {
134 buf.append("<#local ");
135 }
136 else if (scope ==GLOBAL) {
137 buf.append("<#global ");
138 }
139 else {
140 buf.append("<#assign ");
141 }
142 }
143 buf.append (variableName);
144 buf.append('=');
145 buf.append(value.getCanonicalForm());
146 if (!(parent instanceof AssignmentInstruction)) {
147 if (namespaceExp != null) {
148 buf.append(" in ");
149 buf.append(namespaceExp.getCanonicalForm());
150 }
151 buf.append(">");
152 }
153 return buf.toString();
154 }
155
156 public String getDescription() {
157 String s ="";
158 if (!(parent instanceof AssignmentInstruction)) {
159 s = "assignment: ";
160 if (scope == LOCAL) {
161 s = "local " + s;
162 }
163 else if (scope == GLOBAL) {
164 s = "global " + s;
165 }
166 }
167 return s + variableName
168 + "="
169 + value;
170 }
171 }
172 |
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