Mercurial > jdk8-mips64-public > nashorn / file revision
src/jdk/nashorn/internal/runtime/ScriptingFunctions.java@2f1b9f4daec1
src/jdk/nashorn/internal/runtime/ScriptingFunctions.java
Fri, 05 Jun 2015 12:38:53 +0200
- author
- mhaupt
- date
- Fri, 05 Jun 2015 12:38:53 +0200
- changeset 1398
- 2f1b9f4daec1
- parent 1388
- d03088193a17
- child 1403
- b39a918a34a4
- permissions
- -rw-r--r--
8080087: Nashorn $ENV.PWD is originally undefined
Summary: On Windows, the PWD environment variable does not exist and cannot be imported in scripting mode, so it is set explicitly.
Reviewed-by: lagergren, sundar
1 /*
2 * Copyright (c) 2010, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package jdk.nashorn.internal.runtime;
28 import static jdk.nashorn.internal.lookup.Lookup.MH;
29 import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
30 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
32 import java.io.BufferedReader;
33 import java.io.File;
34 import java.io.IOException;
35 import java.io.InputStreamReader;
36 import java.io.OutputStreamWriter;
37 import java.io.StreamTokenizer;
38 import java.io.StringReader;
39 import java.lang.invoke.MethodHandle;
40 import java.lang.invoke.MethodHandles;
41 import java.util.ArrayList;
42 import java.util.List;
43 import java.util.Map;
45 /**
46 * Global functions supported only in scripting mode.
47 */
48 public final class ScriptingFunctions {
50 /** Handle to implementation of {@link ScriptingFunctions#readLine} - Nashorn extension */
51 public static final MethodHandle READLINE = findOwnMH("readLine", Object.class, Object.class, Object.class);
53 /** Handle to implementation of {@link ScriptingFunctions#readFully} - Nashorn extension */
54 public static final MethodHandle READFULLY = findOwnMH("readFully", Object.class, Object.class, Object.class);
56 /** Handle to implementation of {@link ScriptingFunctions#exec} - Nashorn extension */
57 public static final MethodHandle EXEC = findOwnMH("exec", Object.class, Object.class, Object.class, Object.class);
59 /** EXEC name - special property used by $EXEC API. */
60 public static final String EXEC_NAME = "$EXEC";
62 /** OUT name - special property used by $EXEC API. */
63 public static final String OUT_NAME = "$OUT";
65 /** ERR name - special property used by $EXEC API. */
66 public static final String ERR_NAME = "$ERR";
68 /** EXIT name - special property used by $EXEC API. */
69 public static final String EXIT_NAME = "$EXIT";
71 /** Names of special properties used by $ENV API. */
72 public static final String ENV_NAME = "$ENV";
74 /** Name of the environment variable for the current working directory. */
75 public static final String PWD_NAME = "PWD";
77 private ScriptingFunctions() {
78 }
80 /**
81 * Nashorn extension: global.readLine (scripting-mode-only)
82 * Read one line of input from the standard input.
83 *
84 * @param self self reference
85 * @param prompt String used as input prompt
86 *
87 * @return line that was read
88 *
89 * @throws IOException if an exception occurs
90 */
91 public static Object readLine(final Object self, final Object prompt) throws IOException {
92 if (prompt != UNDEFINED) {
93 System.out.print(JSType.toString(prompt));
94 }
95 final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
96 return reader.readLine();
97 }
99 /**
100 * Nashorn extension: Read the entire contents of a text file and return as String.
101 *
102 * @param self self reference
103 * @param file The input file whose content is read.
104 *
105 * @return String content of the input file.
106 *
107 * @throws IOException if an exception occurs
108 */
109 public static Object readFully(final Object self, final Object file) throws IOException {
110 File f = null;
112 if (file instanceof File) {
113 f = (File)file;
114 } else if (JSType.isString(file)) {
115 f = new java.io.File(((CharSequence)file).toString());
116 }
118 if (f == null || !f.isFile()) {
119 throw typeError("not.a.file", ScriptRuntime.safeToString(file));
120 }
122 return new String(Source.readFully(f));
123 }
125 /**
126 * Nashorn extension: exec a string in a separate process.
127 *
128 * @param self self reference
129 * @param string string to execute
130 * @param input input
131 *
132 * @return output string from the request
133 * @throws IOException if any stream access fails
134 * @throws InterruptedException if execution is interrupted
135 */
136 public static Object exec(final Object self, final Object string, final Object input) throws IOException, InterruptedException {
137 // Current global is need to fetch additional inputs and for additional results.
138 final ScriptObject global = Context.getGlobal();
140 // Set up initial process.
141 final ProcessBuilder processBuilder = new ProcessBuilder(tokenizeString(JSType.toString(string)));
143 // Current ENV property state.
144 final Object env = global.get(ENV_NAME);
145 if (env instanceof ScriptObject) {
146 final ScriptObject envProperties = (ScriptObject)env;
148 // If a working directory is present, use it.
149 final Object pwd = envProperties.get(PWD_NAME);
150 if (pwd != UNDEFINED) {
151 processBuilder.directory(new File(JSType.toString(pwd)));
152 }
154 // Set up ENV variables.
155 final Map<String, String> environment = processBuilder.environment();
156 environment.clear();
157 for (final Map.Entry<Object, Object> entry : envProperties.entrySet()) {
158 environment.put(JSType.toString(entry.getKey()), JSType.toString(entry.getValue()));
159 }
160 }
162 // Start the process.
163 final Process process = processBuilder.start();
164 final IOException exception[] = new IOException[2];
166 // Collect output.
167 final StringBuilder outBuffer = new StringBuilder();
168 final Thread outThread = new Thread(new Runnable() {
169 @Override
170 public void run() {
171 final char buffer[] = new char[1024];
172 try (final InputStreamReader inputStream = new InputStreamReader(process.getInputStream())) {
173 for (int length; (length = inputStream.read(buffer, 0, buffer.length)) != -1; ) {
174 outBuffer.append(buffer, 0, length);
175 }
176 } catch (final IOException ex) {
177 exception[0] = ex;
178 }
179 }
180 }, "$EXEC output");
182 // Collect errors.
183 final StringBuilder errBuffer = new StringBuilder();
184 final Thread errThread = new Thread(new Runnable() {
185 @Override
186 public void run() {
187 final char buffer[] = new char[1024];
188 try (final InputStreamReader inputStream = new InputStreamReader(process.getErrorStream())) {
189 for (int length; (length = inputStream.read(buffer, 0, buffer.length)) != -1; ) {
190 errBuffer.append(buffer, 0, length);
191 }
192 } catch (final IOException ex) {
193 exception[1] = ex;
194 }
195 }
196 }, "$EXEC error");
198 // Start gathering output.
199 outThread.start();
200 errThread.start();
202 // If input is present, pass on to process.
203 try (OutputStreamWriter outputStream = new OutputStreamWriter(process.getOutputStream())) {
204 if (input != UNDEFINED) {
205 final String in = JSType.toString(input);
206 outputStream.write(in, 0, in.length());
207 }
208 } catch (final IOException ex) {
209 // Process was not expecting input. May be normal state of affairs.
210 }
212 // Wait for the process to complete.
213 final int exit = process.waitFor();
214 outThread.join();
215 errThread.join();
217 final String out = outBuffer.toString();
218 final String err = errBuffer.toString();
220 // Set globals for secondary results.
221 global.set(OUT_NAME, out, 0);
222 global.set(ERR_NAME, err, 0);
223 global.set(EXIT_NAME, exit, 0);
225 // Propagate exception if present.
226 for (final IOException element : exception) {
227 if (element != null) {
228 throw element;
229 }
230 }
232 // Return the result from stdout.
233 return out;
234 }
236 private static MethodHandle findOwnMH(final String name, final Class<?> rtype, final Class<?>... types) {
237 return MH.findStatic(MethodHandles.lookup(), ScriptingFunctions.class, name, MH.type(rtype, types));
238 }
240 /**
241 * Break a string into tokens, honoring quoted arguments and escaped spaces.
242 *
243 * @param str a {@link String} to tokenize.
244 * @return a {@link List} of {@link String}s representing the tokens that
245 * constitute the string.
246 * @throws IOException in case {@link StreamTokenizer#nextToken()} raises it.
247 */
248 public static List<String> tokenizeString(final String str) throws IOException {
249 final StreamTokenizer tokenizer = new StreamTokenizer(new StringReader(str));
250 tokenizer.resetSyntax();
251 tokenizer.wordChars(0, 255);
252 tokenizer.whitespaceChars(0, ' ');
253 tokenizer.commentChar('#');
254 tokenizer.quoteChar('"');
255 tokenizer.quoteChar('\'');
256 final List<String> tokenList = new ArrayList<>();
257 final StringBuilder toAppend = new StringBuilder();
258 while (tokenizer.nextToken() != StreamTokenizer.TT_EOF) {
259 final String s = tokenizer.sval;
260 // The tokenizer understands about honoring quoted strings and recognizes
261 // them as one token that possibly contains multiple space-separated words.
262 // It does not recognize quoted spaces, though, and will split after the
263 // escaping \ character. This is handled here.
264 if (s.endsWith("\\")) {
265 // omit trailing \, append space instead
266 toAppend.append(s.substring(0, s.length() - 1)).append(' ');
267 } else {
268 tokenList.add(toAppend.append(s).toString());
269 toAppend.setLength(0);
270 }
271 }
272 if (toAppend.length() != 0) {
273 tokenList.add(toAppend.toString());
274 }
275 return tokenList;
276 }
277 }
