/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant.types;
import java.io.File;
import java.util.StringTokenizer;
import java.util.Vector;
import java.util.ArrayList;
import java.util.List;
import java.util.ListIterator;
import java.util.LinkedList;
import java.util.Iterator;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.ProjectComponent;
import org.apache.tools.ant.util.StringUtils;
import org.apache.tools.ant.taskdefs.condition.Os;
/**
* Commandline objects help handling command lines specifying processes to
* execute.
*
* The class can be used to define a command line as nested elements or as a
* helper to define a command line by an application.
* <p>
* <code>
* <someelement><br>
* <acommandline executable="/executable/to/run"><br>
* <argument value="argument 1" /><br>
* <argument line="argument_1 argument_2 argument_3" /><br>
* <argument value="argument 4" /><br>
* </acommandline><br>
* </someelement><br>
* </code>
* The element <code>someelement</code> must provide a method
* <code>createAcommandline</code> which returns an instance of this class.
*
*/
public class Commandline implements Cloneable {
/** win9x uses a (shudder) bat file (antRun.bat) for executing commands */
private static final boolean IS_WIN_9X = Os.isFamily("win9x");
/**
* The arguments of the command
*/
private Vector arguments = new Vector();
/**
* the program to execute
*/
private String executable = null;
protected static final String DISCLAIMER =
StringUtils.LINE_SEP
+ "The \' characters around the executable and arguments are"
+ StringUtils.LINE_SEP
+ "not part of the command."
+ StringUtils.LINE_SEP;
/**
* Create a command line from a string.
* @param toProcess the line: the first element becomes the executable, the rest
* the arguments.
*/
public Commandline(String toProcess) {
super();
String[] tmp = translateCommandline(toProcess);
if (tmp != null && tmp.length > 0) {
setExecutable(tmp[0]);
for (int i = 1; i < tmp.length; i++) {
createArgument().setValue(tmp[i]);
}
}
}
/**
* Create an empty command line.
*/
public Commandline() {
super();
}
/**
* Used for nested xml command line definitions.
*/
public static class Argument extends ProjectComponent {
private String[] parts;
/**
* Set a single commandline argument.
*
* @param value a single commandline argument.
*/
public void setValue(String value) {
parts = new String[] {value};
}
/**
* Set the line to split into several commandline arguments.
*
* @param line line to split into several commandline arguments.
*/
public void setLine(String line) {
if (line == null) {
return;
}
parts = translateCommandline(line);
}
/**
* Set a single commandline argument and treats it like a
* PATH--ensuring the right separator for the local platform
* is used.
*
* @param value a single commandline argument.
*/
public void setPath(Path value) {
parts = new String[] {value.toString()};
}
/**
* Set a single commandline argument from a reference to a
* path--ensuring the right separator for the local platform
* is used.
*
* @param value a single commandline argument.
*/
public void setPathref(Reference value) {
Path p = new Path(getProject());
p.setRefid(value);
parts = new String[] {p.toString()};
}
/**
* Set a single commandline argument to the absolute filename
* of the given file.
*
* @param value a single commandline argument.
*/
public void setFile(File value) {
parts = new String[] {value.getAbsolutePath()};
}
/**
* Return the constituent parts of this Argument.
* @return an array of strings.
*/
public String[] getParts() {
return parts;
}
}
/**
* Class to keep track of the position of an Argument.
<p>This class is there to support the srcfile and targetfile
elements of <execon> and <transform> - don't know
whether there might be additional use cases.</p> --SB
*/
public class Marker {
private int position;
private int realPos = -1;
/**
* Construct a marker for the specified position.
* @param position the position to mark.
*/
Marker(int position) {
this.position = position;
}
/**
* Return the number of arguments that preceded this marker.
*
* <p>The name of the executable -- if set -- is counted as the
* first argument.</p>
* @return the position of this marker.
*/
public int getPosition() {
if (realPos == -1) {
realPos = (executable == null ? 0 : 1);
for (int i = 0; i < position; i++) {
Argument arg = (Argument) arguments.elementAt(i);
realPos += arg.getParts().length;
}
}
return realPos;
}
}
/**
* Create an argument object.
*
* <p>Each commandline object has at most one instance of the
* argument class. This method calls
* <code>this.createArgument(false)</code>.</p>
*
* @see #createArgument(boolean)
* @return the argument object.
*/
public Argument createArgument() {
return this.createArgument(false);
}
/**
* Create an argument object and add it to our list of args.
*
* <p>Each commandline object has at most one instance of the
* argument class.</p>
*
* @param insertAtStart if true, the argument is inserted at the
* beginning of the list of args, otherwise it is appended.
* @return an argument to be configured
*/
public Argument createArgument(boolean insertAtStart) {
Argument argument = new Argument();
if (insertAtStart) {
arguments.insertElementAt(argument, 0);
} else {
arguments.addElement(argument);
}
return argument;
}
/**
* Set the executable to run. All file separators in the string
* are converted to the platform specific value.
* @param executable the String executable name.
*/
public void setExecutable(String executable) {
if (executable == null || executable.length() == 0) {
return;
}
this.executable = executable.replace('/', File.separatorChar)
.replace('\\', File.separatorChar);
}
/**
* Get the executable.
* @return the program to run--null if not yet set.
*/
public String getExecutable() {
return executable;
}
/**
* Append the arguments to the existing command.
* @param line an array of arguments to append.
*/
public void addArguments(String[] line) {
for (int i = 0; i < line.length; i++) {
createArgument().setValue(line[i]);
}
}
/**
* Return the executable and all defined arguments.
* @return the commandline as an array of strings.
*/
public String[] getCommandline() {
List commands = new LinkedList();
ListIterator list = commands.listIterator();
addCommandToList(list);
final String[] result = new String[commands.size()];
return (String[]) commands.toArray(result);
}
/**
* Add the entire command, including (optional) executable to a list.
* @param list the list to add to.
* @since Ant 1.6
*/
public void addCommandToList(ListIterator list) {
if (executable != null) {
list.add(executable);
}
addArgumentsToList(list);
}
/**
* Returns all arguments defined by <code>addLine</code>,
* <code>addValue</code> or the argument object.
* @return the arguments as an array of strings.
*/
public String[] getArguments() {
List result = new ArrayList(arguments.size() * 2);
addArgumentsToList(result.listIterator());
String [] res = new String[result.size()];
return (String[]) result.toArray(res);
}
/**
* Append all the arguments to the tail of a supplied list.
* @param list the list of arguments.
* @since Ant 1.6
*/
public void addArgumentsToList(ListIterator list) {
for (int i = 0; i < arguments.size(); i++) {
Argument arg = (Argument) arguments.elementAt(i);
String[] s = arg.getParts();
if (s != null) {
for (int j = 0; j < s.length; j++) {
list.add(s[j]);
}
}
}
}
/**
* Return the command line as a string.
* @return the command line.
*/
public String toString() {
return toString(getCommandline());
}
/**
* Put quotes around the given String if necessary.
*
* <p>If the argument doesn't include spaces or quotes, return it
* as is. If it contains double quotes, use single quotes - else
* surround the argument by double quotes.</p>
* @param argument the argument to quote if necessary.
* @return the quoted argument.
* @exception BuildException if the argument contains both, single
* and double quotes.
*/
public static String quoteArgument(String argument) {
if (argument.indexOf("\"") > -1) {
if (argument.indexOf("\'") > -1) {
throw new BuildException("Can\'t handle single and double"
+ " quotes in same argument");
} else {
return '\'' + argument + '\'';
}
} else if (argument.indexOf("\'") > -1
|| argument.indexOf(" ") > -1
// WIN9x uses a bat file for executing commands
|| (IS_WIN_9X && argument.indexOf(';') != -1)) {
return '\"' + argument + '\"';
} else {
return argument;
}
}
/**
* Quote the parts of the given array in way that makes them
* usable as command line arguments.
* @param line the list of arguments to quote.
* @return empty string for null or no command, else every argument split
* by spaces and quoted by quoting rules.
*/
public static String toString(String[] line) {
// empty path return empty string
if (line == null || line.length == 0) {
return "";
}
// path containing one or more elements
final StringBuffer result = new StringBuffer();
for (int i = 0; i < line.length; i++) {
if (i > 0) {
result.append(' ');
}
result.append(quoteArgument(line[i]));
}
return result.toString();
}
/**
* Crack a command line.
* @param toProcess the command line to process.
* @return the command line broken into strings.
* An empty or null toProcess parameter results in a zero sized array.
*/
public static String[] translateCommandline(String toProcess) {
if (toProcess == null || toProcess.length() == 0) {
//no command? no string
return new String[0];
}
// parse with a simple finite state machine
final int normal = 0;
final int inQuote = 1;
final int inDoubleQuote = 2;
int state = normal;
StringTokenizer tok = new StringTokenizer(toProcess, "\"\' ", true);
Vector v = new Vector();
StringBuffer current = new StringBuffer();
boolean lastTokenHasBeenQuoted = false;
while (tok.hasMoreTokens()) {
String nextTok = tok.nextToken();
switch (state) {
case inQuote:
if ("\'".equals(nextTok)) {
lastTokenHasBeenQuoted = true;
state = normal;
} else {
current.append(nextTok);
}
break;
case inDoubleQuote:
if ("\"".equals(nextTok)) {
lastTokenHasBeenQuoted = true;
state = normal;
} else {
current.append(nextTok);
}
break;
default:
if ("\'".equals(nextTok)) {
state = inQuote;
} else if ("\"".equals(nextTok)) {
state = inDoubleQuote;
} else if (" ".equals(nextTok)) {
if (lastTokenHasBeenQuoted || current.length() != 0) {
v.addElement(current.toString());
current = new StringBuffer();
}
} else {
current.append(nextTok);
}
lastTokenHasBeenQuoted = false;
break;
}
}
if (lastTokenHasBeenQuoted || current.length() != 0) {
v.addElement(current.toString());
}
if (state == inQuote || state == inDoubleQuote) {
throw new BuildException("unbalanced quotes in " + toProcess);
}
String[] args = new String[v.size()];
v.copyInto(args);
return args;
}
/**
* Size operator. This actually creates the command line, so it is not
* a zero cost operation.
* @return number of elements in the command, including the executable.
*/
public int size() {
return getCommandline().length;
}
/**
* Generate a deep clone of the contained object.
* @return a clone of the contained object
*/
public Object clone() {
try {
Commandline c = (Commandline) super.clone();
c.arguments = (Vector) arguments.clone();
return c;
} catch (CloneNotSupportedException e) {
throw new BuildException(e);
}
}
/**
* Clear out the whole command line.
*/
public void clear() {
executable = null;
arguments.removeAllElements();
}
/**
* Clear out the arguments but leave the executable in place for
* another operation.
*/
public void clearArgs() {
arguments.removeAllElements();
}
/**
* Return a marker.
*
* <p>This marker can be used to locate a position on the
* commandline--to insert something for example--when all
* parameters have been set.</p>
* @return a marker
*/
public Marker createMarker() {
return new Marker(arguments.size());
}
/**
* Return a String that describes the command and arguments suitable for
* verbose output before a call to <code>Runtime.exec(String[])<code>.
* @return a string that describes the command and arguments.
* @since Ant 1.5
*/
public String describeCommand() {
return describeCommand(this);
}
/**
* Return a String that describes the arguments suitable for
* verbose output before a call to <code>Runtime.exec(String[])<code>.
* @return a string that describes the arguments.
* @since Ant 1.5
*/
public String describeArguments() {
return describeArguments(this);
}
/**
* Return a String that describes the command and arguments suitable for
* verbose output before a call to <code>Runtime.exec(String[])<code>.
* @param line the Commandline to describe.
* @return a string that describes the command and arguments.
* @since Ant 1.5
*/
public static String describeCommand(Commandline line) {
return describeCommand(line.getCommandline());
}
/**
* Return a String that describes the arguments suitable for
* verbose output before a call to <code>Runtime.exec(String[])<code>.
* @param line the Commandline whose arguments to describe.
* @return a string that describes the arguments.
* @since Ant 1.5
*/
public static String describeArguments(Commandline line) {
return describeArguments(line.getArguments());
}
/**
* Return a String that describes the command and arguments suitable for
* verbose output before a call to <code>Runtime.exec(String[])<code>.
*
* <p>This method assumes that the first entry in the array is the
* executable to run.</p>
* @param args the command line to describe as an array of strings
* @return a string that describes the command and arguments.
* @since Ant 1.5
*/
public static String describeCommand(String[] args) {
if (args == null || args.length == 0) {
return "";
}
StringBuffer buf = new StringBuffer("Executing \'");
buf.append(args[0]);
buf.append("\'");
if (args.length > 1) {
buf.append(" with ");
buf.append(describeArguments(args, 1));
} else {
buf.append(DISCLAIMER);
}
return buf.toString();
}
/**
* Return a String that describes the arguments suitable for
* verbose output before a call to <code>Runtime.exec(String[])<code>.
* @param args the command line to describe as an array of strings.
* @return a string that describes the arguments.
* @since Ant 1.5
*/
public static String describeArguments(String[] args) {
return describeArguments(args, 0);
}
/**
* Return a String that describes the arguments suitable for
* verbose output before a call to <code>Runtime.exec(String[])<code>.
*
* @param args the command line to describe as an array of strings.
* @param offset ignore entries before this index.
* @return a string that describes the arguments
*
* @since Ant 1.5
*/
protected static String describeArguments(String[] args, int offset) {
if (args == null || args.length <= offset) {
return "";
}
StringBuffer buf = new StringBuffer("argument");
if (args.length > offset) {
buf.append("s");
}
buf.append(":").append(StringUtils.LINE_SEP);
for (int i = offset; i < args.length; i++) {
buf.append("\'").append(args[i]).append("\'")
.append(StringUtils.LINE_SEP);
}
buf.append(DISCLAIMER);
return buf.toString();
}
/**
* Get an iterator to the arguments list.
* @since Ant 1.7
* @return an Iterator.
*/
public Iterator iterator() {
return arguments.iterator();
}
}
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