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30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
InteractiveShell.java | 0% | 0% | 0% | 0% |
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1 |
/*
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2 |
$Id: InteractiveShell.java,v 1.16 2004/12/09 21:05:07 glaforge Exp $
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3 |
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Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
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6 |
Redistribution and use of this software and associated documentation
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|
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("Software"), with or without modification, are permitted provided
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that the following conditions are met:
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9 |
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|
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1. Redistributions of source code must retain copyright
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|
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statements and notices. Redistributions must also contain a
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|
12 |
copy of this document.
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13 |
|
|
14 |
2. Redistributions in binary form must reproduce the
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|
15 |
above copyright notice, this list of conditions and the
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|
16 |
following disclaimer in the documentation and/or other
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|
17 |
materials provided with the distribution.
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19 |
3. The name "groovy" must not be used to endorse or promote
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20 |
products derived from this Software without prior written
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21 |
permission of The Codehaus. For written permission,
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22 |
please contact info@codehaus.org.
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23 |
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|
24 |
4. Products derived from this Software may not be called "groovy"
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|
25 |
nor may "groovy" appear in their names without prior written
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permission of The Codehaus. "groovy" is a registered
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trademark of The Codehaus.
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|
29 |
5. Due credit should be given to The Codehaus -
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30 |
http://groovy.codehaus.org/
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32 |
THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS
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33 |
``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
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34 |
NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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|
35 |
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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36 |
THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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37 |
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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38 |
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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|
39 |
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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|
40 |
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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|
41 |
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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|
42 |
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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OF THE POSSIBILITY OF SUCH DAMAGE.
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|
44 |
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|
45 |
*/
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|
46 |
package groovy.ui;
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|
47 |
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|
48 |
import groovy.lang.GroovyShell;
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|
49 |
import groovy.lang.Binding;
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|
50 |
import org.codehaus.groovy.control.CompilationFailedException;
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|
51 |
import org.codehaus.groovy.control.SourceUnit;
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|
52 |
import org.codehaus.groovy.runtime.InvokerHelper;
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|
53 |
import org.codehaus.groovy.sandbox.ui.Prompt;
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|
54 |
import org.codehaus.groovy.sandbox.ui.PromptFactory;
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|
55 |
import org.codehaus.groovy.syntax.CSTNode;
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|
56 |
import org.codehaus.groovy.syntax.TokenStream;
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|
57 |
import org.codehaus.groovy.tools.ErrorReporter;
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|
58 |
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|
59 |
import java.io.IOException;
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|
60 |
import java.io.InputStream;
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|
61 |
import java.io.PrintStream;
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|
62 |
import java.util.HashMap;
|
|
63 |
import java.util.Map;
|
|
64 |
import java.util.Set;
|
|
65 |
import java.util.Iterator;
|
|
66 |
|
|
67 |
/**
|
|
68 |
* A simple interactive shell for evaluating groovy expressions
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|
69 |
* on the command line
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|
70 |
*
|
|
71 |
* @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
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|
72 |
* @author <a href="mailto:cpoirier@dreaming.org" >Chris Poirier</a>
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|
73 |
* @author Yuri Schimke
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|
74 |
* @author Brian McCallistair
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|
75 |
* @author Guillaume Laforge
|
|
76 |
* @version $Revision: 1.16 $
|
|
77 |
*/
|
|
78 |
public class InteractiveShell |
|
79 |
{ |
|
80 |
private final GroovyShell shell;
|
|
81 |
private final Prompt prompt;
|
|
82 |
private final InputStream in;
|
|
83 |
private final PrintStream out;
|
|
84 |
private final PrintStream err;
|
|
85 |
|
|
86 |
|
|
87 |
/**
|
|
88 |
* Entry point when called directly.
|
|
89 |
*/
|
|
90 | 0 |
public static void main(String args[]) |
91 |
{ |
|
92 | 0 |
try
|
93 |
{ |
|
94 | 0 |
final InteractiveShell groovy = new InteractiveShell();
|
95 | 0 |
groovy.run(args); |
96 |
} |
|
97 |
catch (Exception e)
|
|
98 |
{ |
|
99 | 0 |
System.err.println("Caught: " + e);
|
100 | 0 |
e.printStackTrace(); |
101 |
} |
|
102 |
} |
|
103 |
|
|
104 |
|
|
105 |
/**
|
|
106 |
* Default constructor.
|
|
107 |
*/
|
|
108 | 0 |
public InteractiveShell()
|
109 |
{ |
|
110 | 0 |
this(System.in, System.out, System.err);
|
111 |
} |
|
112 |
|
|
113 |
|
|
114 | 0 |
public InteractiveShell(final InputStream in, final PrintStream out, final PrintStream err)
|
115 |
{ |
|
116 | 0 |
this(new Binding(), in, out, err); |
117 |
} |
|
118 |
|
|
119 | 0 |
public InteractiveShell(Binding binding, final InputStream in, final PrintStream out, final PrintStream err)
|
120 |
{ |
|
121 | 0 |
this.in = in;
|
122 | 0 |
this.out = out;
|
123 | 0 |
this.err = err;
|
124 | 0 |
prompt = PromptFactory.buildPrompt(in, out, err); |
125 | 0 |
prompt.setPrompt("groovy> ");
|
126 | 0 |
shell = new GroovyShell(binding);
|
127 |
} |
|
128 |
|
|
129 |
//---------------------------------------------------------------------------
|
|
130 |
// COMMAND LINE PROCESSING LOOP
|
|
131 |
|
|
132 |
/**
|
|
133 |
* Reads commands and statements from input stream and processes them.
|
|
134 |
*/
|
|
135 | 0 |
public void run(String[] args) throws Exception |
136 |
{ |
|
137 | 0 |
final String version = InvokerHelper.getVersion(); |
138 |
|
|
139 | 0 |
out.println("Lets get Groovy!");
|
140 | 0 |
out.println("================");
|
141 | 0 |
out.println("Version: " + version + " JVM: " + System.getProperty("java.vm.version")); |
142 | 0 |
out.println("Type 'exit' to terminate the shell");
|
143 | 0 |
out.println("Type 'help' for command help");
|
144 | 0 |
out.println("Type 'go' to execute the statements");
|
145 |
|
|
146 | 0 |
int counter = 1;
|
147 | 0 |
boolean running = true; |
148 | 0 |
while (running)
|
149 |
{ |
|
150 |
// Read a single top-level statement from the command line,
|
|
151 |
// trapping errors as they happen. We quit on null.
|
|
152 | 0 |
final String command = read(); |
153 | 0 |
if (command == null) |
154 |
{ |
|
155 | 0 |
close(); |
156 | 0 |
break;
|
157 |
} |
|
158 |
|
|
159 | 0 |
reset(); |
160 |
|
|
161 | 0 |
if (command.length() > 0)
|
162 |
{ |
|
163 |
// We have a command that parses, so evaluate it.
|
|
164 | 0 |
try
|
165 |
{ |
|
166 | 0 |
shell.evaluate(command, "CommandLine" + counter++ + ".groovy"); |
167 |
} |
|
168 |
catch (Exception e)
|
|
169 |
{ |
|
170 | 0 |
err.println("Exception: " + e.getMessage());
|
171 | 0 |
e.printStackTrace(err); |
172 | 0 |
new ErrorReporter(e, false).write(err); |
173 |
} |
|
174 |
catch (Throwable e)
|
|
175 |
{ |
|
176 | 0 |
err.println("Unrecoverable Error: " + e.getMessage());
|
177 | 0 |
e.printStackTrace(err); |
178 | 0 |
new ErrorReporter(e, false).write(err); |
179 | 0 |
err.println(">>> exiting");
|
180 |
|
|
181 |
// cleanly exit the while loop
|
|
182 | 0 |
running = false;
|
183 |
} |
|
184 |
} |
|
185 |
} |
|
186 |
} |
|
187 |
|
|
188 |
|
|
189 | 0 |
protected void close() |
190 |
{ |
|
191 | 0 |
prompt.close(); |
192 |
} |
|
193 |
|
|
194 |
|
|
195 |
//---------------------------------------------------------------------------
|
|
196 |
// COMMAND LINE PROCESSING MACHINERY
|
|
197 |
|
|
198 |
|
|
199 |
private StringBuffer accepted = new StringBuffer(); // The statement text accepted to date |
|
200 |
private String pending = null; // A line of statement text not yet accepted |
|
201 |
private int line = 1; // The current line number |
|
202 |
|
|
203 |
private boolean stale = false; // Set to force clear of accepted |
|
204 |
|
|
205 |
private SourceUnit parser = null; // A SourceUnit used to check the statement |
|
206 |
private TokenStream stream = null; // The TokenStream that backs the Parser |
|
207 |
private Exception error = null; // Any actual syntax error caught during parsing |
|
208 |
private CSTNode tree = null; // The top-level statement when parsed |
|
209 |
|
|
210 |
|
|
211 |
/**
|
|
212 |
* Resets the command-line processing machinery after use.
|
|
213 |
*/
|
|
214 |
|
|
215 | 0 |
protected void reset() |
216 |
{ |
|
217 | 0 |
stale = true;
|
218 | 0 |
pending = null;
|
219 | 0 |
line = 1; |
220 |
|
|
221 | 0 |
parser = null;
|
222 | 0 |
stream = null;
|
223 | 0 |
error = null;
|
224 | 0 |
tree = null;
|
225 |
} |
|
226 |
|
|
227 |
|
|
228 |
/**
|
|
229 |
* Reads a single statement from the command line. Also identifies
|
|
230 |
* and processes command shell commands. Returns the command text
|
|
231 |
* on success, or null when command processing is complete.
|
|
232 |
* <p/>
|
|
233 |
* NOTE: Changed, for now, to read until 'execute' is issued. At
|
|
234 |
* 'execute', the statement must be complete.
|
|
235 |
*/
|
|
236 |
|
|
237 | 0 |
protected String read()
|
238 |
{ |
|
239 | 0 |
reset(); |
240 | 0 |
out.println("");
|
241 |
|
|
242 | 0 |
boolean complete = false; |
243 | 0 |
boolean done = false; |
244 |
|
|
245 | 0 |
while (/* !complete && */ !done) |
246 |
{ |
|
247 |
|
|
248 |
// Read a line. If IOException or null, or command "exit", terminate
|
|
249 |
// processing.
|
|
250 |
|
|
251 | 0 |
try
|
252 |
{ |
|
253 | 0 |
pending = prompt.readLine(); |
254 |
} |
|
255 |
catch (IOException e) { }
|
|
256 |
|
|
257 | 0 |
if (pending == null || (COMMAND_MAPPINGS.containsKey(pending) && ((Integer) COMMAND_MAPPINGS.get(pending)).intValue() == COMMAND_ID_EXIT)) |
258 |
{ |
|
259 | 0 |
return null; // <<<< FLOW CONTROL <<<<<<<< |
260 |
} |
|
261 |
|
|
262 |
// First up, try to process the line as a command and proceed accordingly.
|
|
263 | 0 |
if (COMMAND_MAPPINGS.containsKey(pending))
|
264 |
{ |
|
265 | 0 |
int code = ((Integer) COMMAND_MAPPINGS.get(pending)).intValue();
|
266 | 0 |
switch (code)
|
267 |
{ |
|
268 |
case COMMAND_ID_HELP:
|
|
269 | 0 |
displayHelp(); |
270 | 0 |
break;
|
271 |
|
|
272 |
case COMMAND_ID_DISCARD:
|
|
273 | 0 |
reset(); |
274 | 0 |
done = true;
|
275 | 0 |
break;
|
276 |
|
|
277 |
case COMMAND_ID_DISPLAY:
|
|
278 | 0 |
displayStatement(); |
279 | 0 |
break;
|
280 |
|
|
281 |
case COMMAND_ID_EXPLAIN:
|
|
282 | 0 |
explainStatement(); |
283 | 0 |
break;
|
284 |
|
|
285 |
case COMMAND_ID_BINDING:
|
|
286 | 0 |
displayBinding(); |
287 | 0 |
break;
|
288 |
|
|
289 |
case COMMAND_ID_EXECUTE:
|
|
290 | 0 |
if (complete)
|
291 |
{ |
|
292 | 0 |
done = true;
|
293 |
} |
|
294 |
else
|
|
295 |
{ |
|
296 | 0 |
err.println("statement not complete");
|
297 |
} |
|
298 | 0 |
break;
|
299 |
} |
|
300 |
|
|
301 | 0 |
continue; // <<<< LOOP CONTROL <<<<<<<< |
302 |
} |
|
303 |
|
|
304 |
// Otherwise, it's part of a statement. If it's just whitespace,
|
|
305 |
// we'll just accept it and move on. Otherwise, parsing is attempted
|
|
306 |
// on the cumulated statement text, and errors are reported. The
|
|
307 |
// pending input is accepted or rejected based on that parsing.
|
|
308 |
|
|
309 | 0 |
freshen(); |
310 |
|
|
311 | 0 |
if (pending.trim() == "") |
312 |
{ |
|
313 | 0 |
accept(); |
314 | 0 |
continue; // <<<< LOOP CONTROL <<<<<<<< |
315 |
} |
|
316 |
|
|
317 | 0 |
final String code = current(); |
318 |
|
|
319 | 0 |
if (parse(code, 1))
|
320 |
{ |
|
321 | 0 |
accept(); |
322 | 0 |
complete = true;
|
323 |
} |
|
324 | 0 |
else if (error == null) |
325 |
{ |
|
326 | 0 |
accept(); |
327 |
} |
|
328 |
else
|
|
329 |
{ |
|
330 | 0 |
report(); |
331 |
} |
|
332 |
|
|
333 |
} |
|
334 |
|
|
335 |
// Get and return the statement.
|
|
336 | 0 |
return accepted(complete);
|
337 |
} |
|
338 |
|
|
339 |
|
|
340 |
/**
|
|
341 |
* Returns the accepted statement as a string. If not <code>complete</code>,
|
|
342 |
* returns the empty string.
|
|
343 |
*/
|
|
344 | 0 |
private String accepted(boolean complete) |
345 |
{ |
|
346 | 0 |
if (complete)
|
347 |
{ |
|
348 | 0 |
return accepted.toString();
|
349 |
} |
|
350 | 0 |
return ""; |
351 |
} |
|
352 |
|
|
353 |
|
|
354 |
/**
|
|
355 |
* Returns the current statement, including pending text.
|
|
356 |
*/
|
|
357 | 0 |
private String current()
|
358 |
{ |
|
359 | 0 |
return accepted.toString() + pending + "\n"; |
360 |
} |
|
361 |
|
|
362 |
|
|
363 |
/**
|
|
364 |
* Accepts the pending text into the statement.
|
|
365 |
*/
|
|
366 | 0 |
private void accept() |
367 |
{ |
|
368 | 0 |
accepted.append(pending).append("\n");
|
369 | 0 |
line += 1; |
370 |
} |
|
371 |
|
|
372 |
|
|
373 |
/**
|
|
374 |
* Clears accepted if stale.
|
|
375 |
*/
|
|
376 | 0 |
private void freshen() |
377 |
{ |
|
378 | 0 |
if (stale)
|
379 |
{ |
|
380 | 0 |
accepted.setLength(0); |
381 | 0 |
stale = false;
|
382 |
} |
|
383 |
} |
|
384 |
|
|
385 |
|
|
386 |
//---------------------------------------------------------------------------
|
|
387 |
// SUPPORT ROUTINES
|
|
388 |
|
|
389 |
|
|
390 |
/**
|
|
391 |
* Attempts to parse the specified code with the specified tolerance.
|
|
392 |
* Updates the <code>parser</code> and <code>error</code> members
|
|
393 |
* appropriately. Returns true if the text parsed, false otherwise.
|
|
394 |
* The attempts to identify and suppress errors resulting from the
|
|
395 |
* unfinished source text.
|
|
396 |
*/
|
|
397 | 0 |
private boolean parse(String code, int tolerance) |
398 |
{ |
|
399 | 0 |
boolean parsed = false; |
400 |
|
|
401 | 0 |
parser = null;
|
402 | 0 |
stream = null;
|
403 | 0 |
error = null;
|
404 | 0 |
tree = null;
|
405 |
|
|
406 |
// Create the parser and attempt to parse the text as a top-level statement.
|
|
407 | 0 |
try
|
408 |
{ |
|
409 | 0 |
parser = SourceUnit.create("groovysh script", code, tolerance);
|
410 | 0 |
parser.parse(); |
411 | 0 |
tree = parser.getCST(); |
412 |
|
|
413 |
/* see note on read():
|
|
414 |
* tree = parser.topLevelStatement();
|
|
415 |
*
|
|
416 |
* if( stream.atEnd() ) {
|
|
417 |
* parsed = true;
|
|
418 |
* }
|
|
419 |
*/
|
|
420 | 0 |
parsed = true;
|
421 |
} |
|
422 |
|
|
423 |
// We report errors other than unexpected EOF to the user.
|
|
424 |
catch (CompilationFailedException e)
|
|
425 |
{ |
|
426 | 0 |
if (parser.getErrorCount() > 1 || !parser.failedWithUnexpectedEOF())
|
427 |
{ |
|
428 | 0 |
error = e; |
429 |
} |
|
430 |
} |
|
431 |
|
|
432 |
catch (Exception e)
|
|
433 |
{ |
|
434 | 0 |
error = e; |
435 |
} |
|
436 |
|
|
437 | 0 |
return parsed;
|
438 |
} |
|
439 |
|
|
440 |
|
|
441 |
/**
|
|
442 |
* Reports the last parsing error to the user.
|
|
443 |
*/
|
|
444 |
|
|
445 | 0 |
private void report() |
446 |
{ |
|
447 | 0 |
err.println("Discarding invalid text:");
|
448 | 0 |
new ErrorReporter(error, false).write(err); |
449 |
} |
|
450 |
|
|
451 |
//-----------------------------------------------------------------------
|
|
452 |
// COMMANDS
|
|
453 |
|
|
454 |
private static final int COMMAND_ID_EXIT = 0; |
|
455 |
private static final int COMMAND_ID_HELP = 1; |
|
456 |
private static final int COMMAND_ID_DISCARD = 2; |
|
457 |
private static final int COMMAND_ID_DISPLAY = 3; |
|
458 |
private static final int COMMAND_ID_EXPLAIN = 4; |
|
459 |
private static final int COMMAND_ID_EXECUTE = 5; |
|
460 |
private static final int COMMAND_ID_BINDING = 6; |
|
461 |
|
|
462 |
private static final int LAST_COMMAND_ID = 6; |
|
463 |
|
|
464 |
private static final String[] COMMANDS = {"exit", "help", "discard", "display", "explain", "execute", "binding"}; |
|
465 |
|
|
466 |
private static final Map COMMAND_MAPPINGS = new HashMap(); |
|
467 |
|
|
468 |
static
|
|
469 |
{ |
|
470 | 0 |
for (int i = 0; i <= LAST_COMMAND_ID; i++) |
471 |
{ |
|
472 | 0 |
COMMAND_MAPPINGS.put(COMMANDS[i], new Integer(i));
|
473 |
} |
|
474 |
|
|
475 |
// A few synonyms
|
|
476 |
|
|
477 | 0 |
COMMAND_MAPPINGS.put("quit", new Integer(COMMAND_ID_EXIT)); |
478 | 0 |
COMMAND_MAPPINGS.put("go", new Integer(COMMAND_ID_EXECUTE)); |
479 |
} |
|
480 |
|
|
481 |
private static final Map COMMAND_HELP = new HashMap(); |
|
482 |
|
|
483 |
static
|
|
484 |
{ |
|
485 | 0 |
COMMAND_HELP.put(COMMANDS[COMMAND_ID_EXIT], "exit/quit - terminates processing");
|
486 | 0 |
COMMAND_HELP.put(COMMANDS[COMMAND_ID_HELP], "help - displays this help text");
|
487 | 0 |
COMMAND_HELP.put(COMMANDS[COMMAND_ID_DISCARD], "discard - discards the current statement");
|
488 | 0 |
COMMAND_HELP.put(COMMANDS[COMMAND_ID_DISPLAY], "display - displays the current statement");
|
489 | 0 |
COMMAND_HELP.put(COMMANDS[COMMAND_ID_EXPLAIN], "explain - explains the parsing of the current statement");
|
490 | 0 |
COMMAND_HELP.put(COMMANDS[COMMAND_ID_EXECUTE], "execute/go - temporary command to cause statement execution");
|
491 | 0 |
COMMAND_HELP.put(COMMANDS[COMMAND_ID_BINDING], "binding - shows the binding used by this interactive shell");
|
492 |
} |
|
493 |
|
|
494 |
|
|
495 |
/**
|
|
496 |
* Displays help text about available commands.
|
|
497 |
*/
|
|
498 | 0 |
private void displayHelp() |
499 |
{ |
|
500 | 0 |
out.println("Available commands (must be entered without extraneous characters):");
|
501 | 0 |
for (int i = 0; i <= LAST_COMMAND_ID; i++) |
502 |
{ |
|
503 | 0 |
out.println((String) COMMAND_HELP.get(COMMANDS[i])); |
504 |
} |
|
505 |
} |
|
506 |
|
|
507 |
|
|
508 |
/**
|
|
509 |
* Displays the accepted statement.
|
|
510 |
*/
|
|
511 | 0 |
private void displayStatement() |
512 |
{ |
|
513 | 0 |
final String[] lines = accepted.toString().split("\n");
|
514 | 0 |
for (int i = 0; i < lines.length; i++) |
515 |
{ |
|
516 | 0 |
out.println((i + 1) + "> " + lines[i]);
|
517 |
} |
|
518 |
} |
|
519 |
|
|
520 |
/**
|
|
521 |
* Displays the current binding used when instanciating the shell.
|
|
522 |
*/
|
|
523 | 0 |
private void displayBinding() |
524 |
{ |
|
525 | 0 |
out.println("Avaialble variables in the current binding");
|
526 | 0 |
Binding context = shell.getContext(); |
527 | 0 |
Map variables = context.getVariables(); |
528 | 0 |
Set set = variables.keySet(); |
529 | 0 |
if (set.isEmpty())
|
530 |
{ |
|
531 | 0 |
out.println("The current binding is empty.");
|
532 |
} |
|
533 |
else
|
|
534 |
{ |
|
535 | 0 |
for (Iterator it = set.iterator(); it.hasNext();)
|
536 |
{ |
|
537 | 0 |
String key = (String)it.next(); |
538 | 0 |
out.println(key + " = " + variables.get(key));
|
539 |
} |
|
540 |
} |
|
541 |
} |
|
542 |
|
|
543 |
|
|
544 |
/**
|
|
545 |
* Attempts to parse the accepted statement and display the
|
|
546 |
* parse tree for it.
|
|
547 |
*/
|
|
548 | 0 |
private void explainStatement() |
549 |
{ |
|
550 | 0 |
if (parse(accepted(true), 10) || error == null) |
551 |
{ |
|
552 | 0 |
out.println("Parse tree:");
|
553 | 0 |
out.println(tree); |
554 |
} |
|
555 |
else
|
|
556 |
{ |
|
557 | 0 |
out.println("Statement does not parse");
|
558 |
} |
|
559 |
} |
|
560 |
} |
|
561 |
|
|
562 |
|
|