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1 package com.icl.saxon.style;
2 import com.icl.saxon.tree.AttributeCollection;
3 import com.icl.saxon.tree.NodeImpl;
4 import com.icl.saxon.Context;
5 import com.icl.saxon.Controller;
6 import com.icl.saxon.Bindery;
7 import com.icl.saxon.ParameterSet;
8 import com.icl.saxon.om.NamespaceException;
9 import com.icl.saxon.om.NodeInfo;
10 import com.icl.saxon.om.NamePool;
11 import com.icl.saxon.output.Outputter;
12 import com.icl.saxon.output.ErrorEmitter;
13 import com.icl.saxon.expr.Value;
14 import com.icl.saxon.expr.StringValue;
15 import com.icl.saxon.trace.TraceListener; import javax.xml.transform.TransformerException  ;
17 import javax.xml.transform.TransformerConfigurationException ;
18
19
24
25 public class SAXONFunction extends StyleElement {
26
27 int functionFingerprint = -1;
28 Procedure procedure = new Procedure();
29
30
36
37 protected void processExtensionElementAttribute(int nc)
38 throws TransformerConfigurationException {
39 extensionNamespaces = new short[1];
40 NamePool pool = getNamePool();
41 short uriCode = pool.getURICode(getNameCode());
42 extensionNamespaces[0] = uriCode;
43 }
44
45 public void prepareAttributes() throws TransformerConfigurationException {
46
47 StandardNames sn = getStandardNames();
48 AttributeCollection atts = getAttributeList();
49
50 String nameAtt = null;
51
52 for (int a=0; a<atts.getLength(); a++) {
53 int nc = atts.getNameCode(a);
54 int f = nc & 0xfffff;
55 if (f==sn.NAME) {
56 nameAtt = atts.getValue(a);
57 if (nameAtt.indexOf(':')<0) {
58 compileError("Function name must have a namespace prefix");
59 }
60 try {
61 int functionCode = makeNameCode(nameAtt, false);
62 functionFingerprint = functionCode & 0xfffff;
63 } catch (NamespaceException err) {
64 compileError(err.getMessage());
65 }
66 } else {
67 checkUnknownAttribute(nc);
68 }
69 }
70
71 if (nameAtt==null) {
72 reportAbsence("name");
73 }
74 }
75
76
80
81 public boolean mayContainTemplateBody() {
82 return true;
83 }
84
85 public void validate() throws TransformerConfigurationException {
86 checkTopLevel();
87 }
88
89 public void preprocess() throws TransformerConfigurationException {
90 getPrincipalStyleSheet().allocateLocalSlots(procedure.getNumberOfVariables());
91 }
92
93 public void process(Context context) {}
94
95
98
99 public Procedure getProcedure() {
100 return procedure;
101 }
102
103 public int getFunctionFingerprint() {
104 if (functionFingerprint==-1) {
105 try {
107 prepareAttributes();
108 } catch (TransformerConfigurationException err) {
109 return -1; }
111 }
112 return functionFingerprint;
113 }
114
115
119
120 public int getNthParameter(int n) {
121 NodeImpl node = (NodeImpl)getFirstChild();
122 int pos = 0;
123 while (node!=null) {
124 if (node instanceof XSLParam) {
125 if (pos==n) {
126 return ((XSLParam)node).getVariableFingerprint();
127 } else {
128 pos++;
129 }
130 }
131 node = (NodeImpl)node.getNextSibling();
132 }
133 return -1;
134 }
135
136
139
140 public Value call(ParameterSet params, Context context) throws TransformerException {
141 Bindery bindery = context.getBindery();
142 bindery.openStackFrame(params);
143 Controller controller = context.getController();
144 Outputter old = controller.getOutputter();
145 controller.changeOutputDestination(null, new ErrorEmitter());
146
147 if (controller.isTracing()) { TraceListener listener = controller.getTraceListener();
149 listener.enter(this, context);
150 processChildren(context);
151 listener.leave(this, context);
152 } else {
153 processChildren(context);
154 }
155
156 controller.resetOutputDestination(old);
157 bindery.closeStackFrame();
158 Value result = context.getReturnValue();
159 if (result==null) {
160 result = new StringValue("");
161 }
162 context.setReturnValue(null);
163 return result;
164 }
165
166 }
167
168 |
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