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1 package net.sf.saxon.trace;
2
3 import net.sf.saxon.Version;
4 import net.sf.saxon.value.Value;
5 import net.sf.saxon.expr.XPathContext;
6 import net.sf.saxon.om.Item;
7 import net.sf.saxon.om.NamePool;
8 import net.sf.saxon.om.Navigator;
9 import net.sf.saxon.om.NodeInfo;
10
11 import java.io.PrintStream  ;
12 import java.util.Iterator ;
13
14
19
20 public abstract class AbstractTraceListener implements TraceListener {
21 private int indent = 0;
22 private NamePool pool;
23 private PrintStream out = System.err;
24 private static StringBuffer spaceBuffer = new StringBuffer (" ");
25
26
29
30 public void open() {
31 out.println("<trace " +
32 "saxon-version=\"" + Version.getProductVersion()+ "\" " +
33 getOpeningAttributes() + '>');
34 indent++;
35 }
36
37 protected abstract String getOpeningAttributes();
38
39
42
43 public void close() {
44 indent--;
45 out.println("</trace>");
46 }
47
48
51
52 public void enter(InstructionInfo info, XPathContext context) {
53 int infotype = info.getConstructType();
54 int objectNameCode = info.getObjectNameCode();
55 String tag = tag(infotype);
56 if (tag==null) {
57 return;
59 }
60 String file = AbstractTraceListener.truncateURI(info.getSystemId());
61 pool = context.getController().getNamePool();
62 String msg = AbstractTraceListener.spaces(indent) + '<' + tag;
63 String name = (String )info.getProperty("name");
64 if (name!=null) {
65 msg += " name=\"" + escape(name) + '"';
66 } else if (objectNameCode != -1) {
67 msg += " name=\"" + escape(pool.getDisplayName(objectNameCode)) + '"';
68 }
69 Iterator props = info.getProperties();
70 while (props.hasNext()) {
71 String prop = (String )props.next();
72 Object val = info.getProperty(prop);
73 if (prop.startsWith("{")) {
74 int rcurly = prop.indexOf('}');
76 if (rcurly > 0) {
77 prop = prop.substring(rcurly+1);
78 }
79 }
80 if (val != null && !prop.equals("name") && !prop.equals("expression")) {
81 msg += ' ' + prop + "=\"" + escape(val.toString()) + '"';
82 }
83 }
84
85 msg += " line=\"" + info.getLineNumber() + '"';
86
87 int col = info.getColumnNumber();
88 if (col >= 0) {
89 msg += " column=\"" + info.getColumnNumber() + '"';
90 }
91
92 msg += " module=\"" + escape(file) + "\">";
93 out.println(msg);
94 indent++;
95 }
96
97
102
103 public String escape(String in) {
104 if (in==null) {
105 return "";
106 }
107 CharSequence collapsed = Value.collapseWhitespace(in);
108 StringBuffer sb = new StringBuffer (collapsed.length() + 10);
109 for (int i=0; i<collapsed.length(); i++) {
110 char c = collapsed.charAt(i);
111 if (c=='<') {
112 sb.append("<");
113 } else if (c=='>') {
114 sb.append(">");
115 } else if (c=='&') {
116 sb.append("&");
117 } else if (c=='\"') {
118 sb.append(""");
119 } else if (c=='\n') {
120 sb.append("
");
121 } else if (c=='\r') {
122 sb.append("
");
123 } else if (c=='\t') {
124 sb.append("	");
125 } else {
126 sb.append(c);
127 }
128 }
129 return sb.toString();
130 }
131
132
135
136 public void leave(InstructionInfo info) {
137 int infotype = info.getConstructType();
138 String tag = tag(infotype);
139 if (tag==null) {
140 return;
142 }
143 indent--;
144 out.println(AbstractTraceListener.spaces(indent) + "</" + tag + '>');
145 }
146
147 protected abstract String tag(int construct);
148
149
152
153 public void startCurrentItem(Item item) {
154 if (item instanceof NodeInfo) {
155 NodeInfo curr = (NodeInfo) item;
156 out.println(AbstractTraceListener.spaces(indent) + "<source node=\"" + Navigator.getPath(curr)
157 + "\" line=\"" + curr.getLineNumber()
158 + "\" file=\"" + AbstractTraceListener.truncateURI(curr.getSystemId())
159 + "\">");
160 }
161 indent++;
162 }
163
164
167
168 public void endCurrentItem(Item item) {
169 indent--;
170 if (item instanceof NodeInfo) {
171 NodeInfo curr = (NodeInfo) item;
172 out.println(AbstractTraceListener.spaces(indent) + "</source><!-- " +
173 Navigator.getPath(curr) + " -->");
174 }
175 }
176
177
180
181 private static String truncateURI(String uri) {
182 String file = uri;
183 if (file == null) file = "";
184 while (true) {
185 int i = file.indexOf('/');
186 if (i >= 0 && i < file.length() - 6) {
187 file = file.substring(i + 1);
188 } else {
189 break;
190 }
191 }
192 return file;
193 }
194
195
198
199 private static String spaces(int n) {
200 while (spaceBuffer.length() < n) {
201 spaceBuffer.append(AbstractTraceListener.spaceBuffer);
202 }
203 return AbstractTraceListener.spaceBuffer.substring(0, n);
204 }
205
206
210
211 public void setOutputDestination(PrintStream stream) {
212 out = stream;
213 }
214
215
218
219 public PrintStream getOutputDestination() {
220 return out;
221 }
222 }
223
224 |
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