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1
5
6 package com.hp.hpl.jena.n3;
7 import java.io.*;
8 import antlr.collections.AST;
9 import com.hp.hpl.jena.util.FileUtils ;
10
11
15 public class N3EventPrinter implements N3ParserEventHandler
16 {
17 public boolean printStartFinish = false ;
18
19 PrintWriter out = null;
20
21 public N3EventPrinter(OutputStream _out)
22 {
23 out = FileUtils.asPrintWriterUTF8(_out) ;
24 }
25
26
29
30 public N3EventPrinter(PrintWriter _out)
31 {
32 out = _out;
33 }
34
35 public void error(Exception  ex, String message) { println(out, "Error: "+message) ; flush(out); }
36
39 public void startDocument()
40 {
41 if ( printStartFinish )
42 {
43 println(out, "Document start");
44 flush(out);
45 }
46 }
47 public void endDocument()
48 {
49 if ( printStartFinish )
50 {
51 println(out, "Document end");
52 flush(out);
53 }
54 }
55
56 public void startFormula(int line, String context)
57 {
58 if ( printStartFinish )
59 {
60 print(out, "Formula start: "+context) ;
61 flush(out) ;
62 }
63 }
64
65 public void endFormula(int line, String context)
66 {
67 if ( printStartFinish )
68 {
69 print(out, "Formula finish: "+context) ;
70 flush(out) ;
71 }
72 }
73
74 public void directive(int line, AST directive, AST[] args, String context)
75 {
76 if ( context != null )
77 print(out, context+" ") ;
78
79 print(out, directive.getText()) ;
80
81 for (int i = 0; i < args.length; i++)
82 {
83 print(out, " ");
84 printSlot(out, args[i]) ;
85 }
86 println(out) ;
87 flush(out);
88 }
89
90 public void quad(int line, AST subj, AST prop, AST obj, String context)
91 {
92 if ( context != null )
93 print(out, context+" ") ;
94
95 print(out, "[ ");
96 printSlot(out, subj);
97 print(out, " , ");
98 printSlot(out, prop);
99 print(out, " , ");
100 printSlot(out, obj);
101 println(out, " ]");
102 flush(out);
103 }
104
105 static public String formatSlot(AST slot)
106 {
107 try {
108 StringWriter sw = new StringWriter() ;
109 printSlot(sw, slot) ;
110 sw.close() ;
111 return sw.toString() ;
112 } catch (IOException ioEx) {}
113 return null ;
114 }
115
116 private static void printSlot(Writer out, AST ast) { printSlot(out, ast, true) ; }
117 private static void printSlot(Writer out, AST ast, boolean printType)
118 {
119 try {
120 if (ast == null)
121 {
122 out.write("<null>");
123 return;
124 }
125
126 int tokenType = ast.getType();
127 String tmp = ast.toString();
128 if (tmp.equals(""))
129 tmp = "<empty string>";
130
131 switch (tokenType)
132 {
133 case N3Parser.LITERAL:
134 out.write('"');
135 printString(out, tmp);
136 out.write('"');
137
138 AST a1 = ast.getNextSibling() ;
139 AST a2 = (a1==null?null:a1.getNextSibling()) ;
140 printLiteralModifier(out, a1) ;
141 printLiteralModifier(out, a2) ;
142 break ;
143
144 case N3Parser.UVAR:
145 AST ast2 = ast.getFirstChild() ;
147 out.write(tmp) ;
148 if ( ast2 != null )
149 {
150 out.write("^^") ;
151 printSlot(out, ast2, false) ;
152 }
153 break ;
154
155 default:
157 out.write(tmp) ;
158 break ;
159 }
160
161 if ( printType )
162 {
163 out.write('(');
164 out.write(N3Parser.getTokenNames()[tokenType]);
165 out.write(')');
166 }
167 } catch (IOException ioEx) {}
168
169 }
170
171 private static void printString(Writer out, String s)
172 {
173 try {
174 for (int i = 0; i < s.length(); i++)
175 {
176 char c = s.charAt(i);
177 if (c == '\\' || c == '"')
178 {
179 out.write('\\');
180 out.write(c);
181 }
182 else if (c == '\n')
183 {
184 out.write("\\n");
185 }
186 else if (c == '\r')
187 {
188 out.write("\\r");
189 }
190 else if (c == '\t')
191 {
192 out.write("\\t");
193 }
194 else if (c >= 32 && c < 127)
195 {
196 out.write(c);
197 }
198 else
199 {
200 String hexstr = Integer.toHexString(c).toUpperCase();
201 int pad = 4 - hexstr.length();
202 out.write("\\u");
203 for (; pad > 0; pad--)
204 out.write("0");
205 out.write(hexstr);
206 }
207 }
208 } catch (IOException ioEx) {}
209 }
210
211 private static void printLiteralModifier(Writer out, AST a) throws IOException
212 {
213 if ( a == null )
214 return ;
215 int i = a.getType() ;
216 switch (a.getType())
217 {
218 case N3Parser.DATATYPE :
219 out.write("^^");
220 AST dt = a.getFirstChild() ;
221 printSlot(out, dt, false) ;
222 break;
223 case N3Parser.AT_LANG :
224 out.write(a.getText());
226 break ;
227 default :
228 System.err.println(
229 "Error in grammar - not a datatype or lang tag: "
230 + a.getText()
231 + "/"
232 + N3Parser.getTokenNames()[a.getType()]);
233 }
234 }
235
236
237 private static void print(PrintWriter out, String s)
238 {
239 out.print(s);
240 }
241 private static void println(PrintWriter out, String s)
242 {
243 out.println(s) ;
244 }
245 private static void println(PrintWriter out)
246 {
247 out.println() ;
248 }
249
250 private static void flush(PrintWriter out)
251 {
252 out.flush() ;
253 }
254 }
255
256
282 |
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