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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% |
|
1 |
/*
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|
2 |
$Id: InteractiveShell.java,v 1.12 2004/04/19 07:29:43 cpoirier 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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5 |
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6 |
Redistribution and use of this software and associated documentation
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|
7 |
("Software"), with or without modification, are permitted provided
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|
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that the following conditions are met:
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|
9 |
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|
10 |
1. Redistributions of source code must retain copyright
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|
11 |
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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18 |
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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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26 |
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 |
|
|
48 |
import groovy.lang.GroovyShell;
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|
49 |
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|
50 |
import java.io.BufferedReader;
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|
51 |
import java.io.IOException;
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|
52 |
import java.io.InputStreamReader;
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|
53 |
import java.util.HashMap;
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|
54 |
import java.util.Map;
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|
55 |
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|
56 |
import org.codehaus.groovy.control.CompilationFailedException;
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|
57 |
import org.codehaus.groovy.control.SourceUnit;
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|
58 |
import org.codehaus.groovy.runtime.InvokerHelper;
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|
59 |
import org.codehaus.groovy.syntax.CSTNode;
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|
60 |
import org.codehaus.groovy.syntax.TokenStream;
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|
61 |
import org.codehaus.groovy.tools.ErrorReporter;
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|
62 |
|
|
63 |
|
|
64 |
/**
|
|
65 |
* A simple interactive shell for evaluating groovy expressions
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|
66 |
* on the command line
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|
67 |
*
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|
68 |
* @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
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|
69 |
* @author <a href="mailto:cpoirier@dreaming.org" >Chris Poirier</a>
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|
70 |
* @version $Revision: 1.12 $
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|
71 |
*/
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|
72 |
public class InteractiveShell { |
|
73 |
|
|
74 |
GroovyShell shell = new GroovyShell();
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|
75 |
BufferedReader reader; |
|
76 |
|
|
77 |
|
|
78 |
/**
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|
79 |
* Entry point when called directly.
|
|
80 |
*/
|
|
81 |
|
|
82 | 0 |
public static void main(String args[]) { |
83 | 0 |
try {
|
84 | 0 |
InteractiveShell groovy = new InteractiveShell();
|
85 | 0 |
groovy.run(args); |
86 |
} |
|
87 |
catch (Exception e) {
|
|
88 | 0 |
System.out.println("Caught: " + e);
|
89 | 0 |
e.printStackTrace(); |
90 |
} |
|
91 |
} |
|
92 |
|
|
93 |
|
|
94 |
/**
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|
95 |
* Default constructor.
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|
96 |
*/
|
|
97 |
|
|
98 | 0 |
public InteractiveShell() {
|
99 |
} |
|
100 |
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|
101 |
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|
102 |
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|
103 |
//---------------------------------------------------------------------------
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|
104 |
// COMMAND LINE PROCESSING LOOP
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|
105 |
|
|
106 |
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|
107 |
/**
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|
108 |
* Reads commands and statements from input stream and processes them.
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|
109 |
*/
|
|
110 |
|
|
111 | 0 |
public void run(String[] args) throws Exception { |
112 | 0 |
reader = new BufferedReader(new InputStreamReader(System.in)); |
113 |
|
|
114 | 0 |
String version = InvokerHelper.getVersion(); |
115 |
|
|
116 | 0 |
System.out.println("Lets get Groovy!");
|
117 | 0 |
System.out.println("================");
|
118 | 0 |
System.out.println("Version: " + version + " JVM: " + System.getProperty("java.vm.version")); |
119 | 0 |
System.out.println("Type 'exit' to terminate the shell");
|
120 | 0 |
System.out.println("Type 'help' for command help");
|
121 |
|
|
122 | 0 |
int counter = 1;
|
123 | 0 |
while( true ) { |
124 |
|
|
125 |
//
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|
126 |
// Read a single top-level statement from the command line,
|
|
127 |
// trapping errors as they happen. We quit on null.
|
|
128 |
|
|
129 | 0 |
String command = read(); |
130 | 0 |
if( command == null ) { |
131 | 0 |
break;
|
132 |
} |
|
133 |
|
|
134 | 0 |
reset(); |
135 |
|
|
136 | 0 |
if( command.length() > 0 ) {
|
137 |
|
|
138 |
//
|
|
139 |
// We have a command that parses, so evaluate it.
|
|
140 |
|
|
141 | 0 |
try {
|
142 | 0 |
Object answer = shell.evaluate(command, "CommandLine" + counter++ +".groovy"); |
143 |
// System.out.println(InvokerHelper.inspect(answer));
|
|
144 |
} |
|
145 |
catch( Exception e ) {
|
|
146 | 0 |
new ErrorReporter( e, false ).write( System.err ); |
147 |
} |
|
148 |
catch( Throwable e ) {
|
|
149 | 0 |
new ErrorReporter( e, false ).write( System.err ); |
150 | 0 |
System.err.println( ">>> exiting" );
|
151 | 0 |
System.exit(1); |
152 |
} |
|
153 |
} |
|
154 |
} |
|
155 |
} |
|
156 |
|
|
157 |
|
|
158 |
|
|
159 |
|
|
160 |
//---------------------------------------------------------------------------
|
|
161 |
// COMMAND LINE PROCESSING MACHINERY
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|
162 |
|
|
163 |
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|
164 |
private StringBuffer accepted = new StringBuffer(); // The statement text accepted to date |
|
165 |
private String pending = null; // A line of statement text not yet accepted |
|
166 |
private int line = 1; // The current line number |
|
167 |
|
|
168 |
private boolean stale = false; // Set to force clear of accepted |
|
169 |
|
|
170 |
private SourceUnit parser = null; // A SourceUnit used to check the statement |
|
171 |
private TokenStream stream = null; // The TokenStream that backs the Parser |
|
172 |
private Exception error = null; // Any actual syntax error caught during parsing |
|
173 |
private CSTNode tree = null; // The top-level statement when parsed |
|
174 |
|
|
175 |
|
|
176 |
|
|
177 |
/**
|
|
178 |
* Resets the command-line processing machinery after use.
|
|
179 |
*/
|
|
180 |
|
|
181 | 0 |
protected void reset() { |
182 | 0 |
stale = true;
|
183 | 0 |
pending = null;
|
184 | 0 |
line = 1; |
185 |
|
|
186 | 0 |
parser = null;
|
187 | 0 |
stream = null;
|
188 | 0 |
error = null;
|
189 | 0 |
tree = null;
|
190 |
} |
|
191 |
|
|
192 |
|
|
193 |
|
|
194 |
/**
|
|
195 |
* Reads a single statement from the command line. Also identifies
|
|
196 |
* and processes command shell commands. Returns the command text
|
|
197 |
* on success, or null when command processing is complete.
|
|
198 |
* <p>
|
|
199 |
* NOTE: Changed, for now, to read until 'execute' is issued. At
|
|
200 |
* 'execute', the statement must be complete.
|
|
201 |
*/
|
|
202 |
|
|
203 | 0 |
protected String read() {
|
204 |
|
|
205 | 0 |
reset(); |
206 | 0 |
System.out.println( "" );
|
207 |
|
|
208 | 0 |
boolean complete = false; |
209 | 0 |
boolean done = false; |
210 |
|
|
211 | 0 |
while( /* !complete && */ !done ) { |
212 |
|
|
213 |
//
|
|
214 |
// Prompt
|
|
215 |
|
|
216 | 0 |
System.out.print( line + "> ");
|
217 |
|
|
218 |
|
|
219 |
//
|
|
220 |
// Read a line. If IOException or null, or command "exit", terminate
|
|
221 |
// processing.
|
|
222 |
|
|
223 | 0 |
try { pending = reader.readLine(); } catch( IOException e ) { } |
224 |
|
|
225 | 0 |
if( pending == null || (COMMAND_MAPPINGS.containsKey(pending) && ((Integer)COMMAND_MAPPINGS.get(pending)).intValue() == COMMAND_ID_EXIT) ) { |
226 | 0 |
return null; // <<<< FLOW CONTROL <<<<<<<< |
227 |
} |
|
228 |
|
|
229 |
|
|
230 |
//
|
|
231 |
// First up, try to process the line as a command and proceed accordingly.
|
|
232 |
|
|
233 | 0 |
if( COMMAND_MAPPINGS.containsKey(pending) ) {
|
234 |
|
|
235 | 0 |
int code = ((Integer)COMMAND_MAPPINGS.get(pending)).intValue();
|
236 | 0 |
switch( code ) {
|
237 |
|
|
238 |
case COMMAND_ID_HELP:
|
|
239 | 0 |
displayHelp(); |
240 | 0 |
break;
|
241 |
|
|
242 |
case COMMAND_ID_DISCARD:
|
|
243 | 0 |
reset(); |
244 | 0 |
done = true;
|
245 | 0 |
break;
|
246 |
|
|
247 |
case COMMAND_ID_DISPLAY:
|
|
248 | 0 |
displayStatement(); |
249 | 0 |
break;
|
250 |
|
|
251 |
case COMMAND_ID_EXPLAIN:
|
|
252 | 0 |
explainStatement(); |
253 | 0 |
break;
|
254 |
|
|
255 |
case COMMAND_ID_EXECUTE:
|
|
256 | 0 |
if( complete ) {
|
257 | 0 |
done = true;
|
258 |
} |
|
259 |
else {
|
|
260 | 0 |
System.err.println( "statement not complete" );
|
261 |
} |
|
262 | 0 |
break;
|
263 |
} |
|
264 |
|
|
265 | 0 |
continue; // <<<< LOOP CONTROL <<<<<<<< |
266 |
|
|
267 |
} |
|
268 |
|
|
269 |
|
|
270 |
//
|
|
271 |
// Otherwise, it's part of a statement. If it's just whitespace,
|
|
272 |
// we'll just accept it and move on. Otherwise, parsing is attempted
|
|
273 |
// on the cumulated statement text, and errors are reported. The
|
|
274 |
// pending input is accepted or rejected based on that parsing.
|
|
275 |
|
|
276 | 0 |
freshen(); |
277 |
|
|
278 | 0 |
if( pending.trim() == "" ) { |
279 | 0 |
accept(); |
280 | 0 |
continue; // <<<< LOOP CONTROL <<<<<<<< |
281 |
} |
|
282 |
|
|
283 | 0 |
String code = current(); |
284 |
|
|
285 | 0 |
if( parse(code, 1) ) {
|
286 | 0 |
accept(); |
287 | 0 |
complete = true;
|
288 |
} |
|
289 | 0 |
else if( error == null ) { |
290 | 0 |
accept(); |
291 |
} |
|
292 |
else {
|
|
293 | 0 |
report( ); |
294 |
} |
|
295 |
|
|
296 |
} |
|
297 |
|
|
298 |
|
|
299 |
//
|
|
300 |
// Get and return the statement.
|
|
301 |
|
|
302 | 0 |
return accepted( complete );
|
303 |
} |
|
304 |
|
|
305 |
|
|
306 |
|
|
307 |
/**
|
|
308 |
* Returns the accepted statement as a string. If not <code>complete</code>,
|
|
309 |
* returns the empty string.
|
|
310 |
*/
|
|
311 |
|
|
312 | 0 |
private String accepted( boolean complete ) { |
313 | 0 |
if( complete ) {
|
314 | 0 |
return accepted.toString();
|
315 |
} |
|
316 | 0 |
return ""; |
317 |
} |
|
318 |
|
|
319 |
|
|
320 |
|
|
321 |
/**
|
|
322 |
* Returns the current statement, including pending text.
|
|
323 |
*/
|
|
324 |
|
|
325 | 0 |
private String current( ) {
|
326 | 0 |
return accepted.toString() + pending + "\n"; |
327 |
} |
|
328 |
|
|
329 |
|
|
330 |
|
|
331 |
/**
|
|
332 |
* Accepts the pending text into the statement.
|
|
333 |
*/
|
|
334 |
|
|
335 | 0 |
private void accept() { |
336 | 0 |
accepted.append( pending ).append( "\n" );
|
337 | 0 |
line += 1; |
338 |
} |
|
339 |
|
|
340 |
|
|
341 |
/**
|
|
342 |
* Clears accepted if stale.
|
|
343 |
*/
|
|
344 |
|
|
345 | 0 |
private void freshen() { |
346 | 0 |
if( stale ) {
|
347 | 0 |
accepted.setLength(0); |
348 | 0 |
stale = false;
|
349 |
} |
|
350 |
} |
|
351 |
|
|
352 |
|
|
353 |
|
|
354 |
|
|
355 |
|
|
356 |
//---------------------------------------------------------------------------
|
|
357 |
// SUPPORT ROUTINES
|
|
358 |
|
|
359 |
|
|
360 |
/**
|
|
361 |
* Attempts to parse the specified code with the specified tolerance.
|
|
362 |
* Updates the <code>parser</code> and <code>error</code> members
|
|
363 |
* appropriately. Returns true if the text parsed, false otherwise.
|
|
364 |
* The attempts to identify and suppress errors resulting from the
|
|
365 |
* unfinished source text.
|
|
366 |
*/
|
|
367 |
|
|
368 | 0 |
private boolean parse( String code, int tolerance ) { |
369 |
|
|
370 | 0 |
boolean parsed = false; |
371 |
|
|
372 | 0 |
parser = null;
|
373 | 0 |
stream = null;
|
374 | 0 |
error = null;
|
375 | 0 |
tree = null;
|
376 |
|
|
377 |
//
|
|
378 |
// Create the parser and attempt to parse the text as a top-level statement.
|
|
379 |
|
|
380 | 0 |
try {
|
381 |
|
|
382 | 0 |
parser = SourceUnit.create( "groovysh script", code, tolerance );
|
383 | 0 |
parser.parse(); |
384 | 0 |
tree = parser.getCST(); |
385 |
|
|
386 |
/* see note on read():
|
|
387 |
* tree = parser.topLevelStatement();
|
|
388 |
*
|
|
389 |
* if( stream.atEnd() ) {
|
|
390 |
* parsed = true;
|
|
391 |
* }
|
|
392 |
*/
|
|
393 |
|
|
394 | 0 |
parsed = true;
|
395 |
} |
|
396 |
|
|
397 |
//
|
|
398 |
// We report errors other than unexpected EOF to the user.
|
|
399 |
|
|
400 |
catch( CompilationFailedException e ) {
|
|
401 | 0 |
if( parser.getErrorCount() > 1 || !parser.failedWithUnexpectedEOF() ) {
|
402 | 0 |
error = e; |
403 |
} |
|
404 |
} |
|
405 |
|
|
406 |
catch( Exception e ) {
|
|
407 | 0 |
error = e; |
408 |
} |
|
409 |
|
|
410 | 0 |
return parsed;
|
411 |
} |
|
412 |
|
|
413 |
|
|
414 |
|
|
415 |
/**
|
|
416 |
* Reports the last parsing error to the user.
|
|
417 |
*/
|
|
418 |
|
|
419 | 0 |
private void report() { |
420 | 0 |
System.err.println( "discarding invalid text:" );
|
421 | 0 |
new ErrorReporter( error, false ).write( System.err ); |
422 |
} |
|
423 |
|
|
424 |
|
|
425 |
|
|
426 |
|
|
427 |
|
|
428 |
//-----------------------------------------------------------------------
|
|
429 |
// COMMANDS
|
|
430 |
|
|
431 |
private static final int COMMAND_ID_EXIT = 0; |
|
432 |
private static final int COMMAND_ID_HELP = 1; |
|
433 |
private static final int COMMAND_ID_DISCARD = 2; |
|
434 |
private static final int COMMAND_ID_DISPLAY = 3; |
|
435 |
private static final int COMMAND_ID_EXPLAIN = 4; |
|
436 |
private static final int COMMAND_ID_EXECUTE = 5; |
|
437 |
private static final int LAST_COMMAND_ID = 5; |
|
438 |
|
|
439 |
private static final String[] COMMANDS = { "exit", "help", "discard", "display", "explain", "execute" }; |
|
440 |
|
|
441 |
private static final Map COMMAND_MAPPINGS = new HashMap(); |
|
442 |
|
|
443 |
static {
|
|
444 | 0 |
for( int i = 0; i <= LAST_COMMAND_ID; i++ ) { |
445 | 0 |
COMMAND_MAPPINGS.put( COMMANDS[i], new Integer(i) );
|
446 |
} |
|
447 |
|
|
448 |
// A few synonyms
|
|
449 |
|
|
450 | 0 |
COMMAND_MAPPINGS.put( "quit", new Integer(COMMAND_ID_EXIT) ); |
451 | 0 |
COMMAND_MAPPINGS.put( "go" , new Integer(COMMAND_ID_EXECUTE) ); |
452 |
} |
|
453 |
|
|
454 |
private static final Map COMMAND_HELP = new HashMap(); |
|
455 |
|
|
456 |
static {
|
|
457 | 0 |
COMMAND_HELP.put( COMMANDS[COMMAND_ID_EXIT ], "exit/quit - terminates processing" );
|
458 | 0 |
COMMAND_HELP.put( COMMANDS[COMMAND_ID_HELP ], "help - displays this help text" );
|
459 | 0 |
COMMAND_HELP.put( COMMANDS[COMMAND_ID_DISCARD], "discard - discards the current statement" );
|
460 | 0 |
COMMAND_HELP.put( COMMANDS[COMMAND_ID_DISPLAY], "display - displays the current statement" );
|
461 | 0 |
COMMAND_HELP.put( COMMANDS[COMMAND_ID_EXPLAIN], "explain - explains the parsing of the current statement" );
|
462 | 0 |
COMMAND_HELP.put( COMMANDS[COMMAND_ID_EXECUTE], "execute/go - temporary command to cause statement execution" );
|
463 |
} |
|
464 |
|
|
465 |
|
|
466 |
|
|
467 |
/**
|
|
468 |
* Displays help text about available commands.
|
|
469 |
*/
|
|
470 |
|
|
471 | 0 |
private void displayHelp() { |
472 | 0 |
System.out.println( "Available commands (must be entered without extraneous characters):" );
|
473 | 0 |
for( int i = 0; i <= LAST_COMMAND_ID; i++ ) { |
474 | 0 |
System.out.println( (String)COMMAND_HELP.get(COMMANDS[i]) ); |
475 |
} |
|
476 |
} |
|
477 |
|
|
478 |
|
|
479 |
|
|
480 |
/**
|
|
481 |
* Displays the accepted statement.
|
|
482 |
*/
|
|
483 |
|
|
484 | 0 |
private void displayStatement() { |
485 | 0 |
String[] lines = accepted.toString().split("\n");
|
486 | 0 |
for( int i = 0; i < lines.length; i++ ) { |
487 | 0 |
System.out.println( (i+1) + "> " + lines[i] );
|
488 |
} |
|
489 |
} |
|
490 |
|
|
491 |
|
|
492 |
|
|
493 |
/**
|
|
494 |
* Attempts to parse the accepted statement and display the
|
|
495 |
* parse tree for it.
|
|
496 |
*/
|
|
497 |
|
|
498 | 0 |
private void explainStatement() { |
499 |
|
|
500 | 0 |
if( parse(accepted(true), 10) || error == null ) { |
501 | 0 |
System.out.println( "parse tree:" );
|
502 | 0 |
System.out.println( tree ); |
503 |
} |
|
504 |
else {
|
|
505 | 0 |
System.out.println( "statement does not parse" );
|
506 |
} |
|
507 |
} |
|
508 |
} |
|
509 |
|
|
510 |
|
|