AST解析器中的java问题
我从一个网站下载了AST浏览器代码
但我得到的错误如下。eclipse软件包不存在，我使用eclipse IDE，代码如下，请帮助我
package astexplorer;
/**
* Parses a source file and displays its nodes in a SWT Tree widget
* You should run the main method inside the Eclipse IDE.
* Do not forget to add the jvm option java.library.path specifing
* the SWT native library. On a Windows system it may look like this:
* -Djava.library.path=C:\eclipse\plugins\org.eclipse.swt.win32_3.0.2\os\win32\x86
* @author Manoel Marques
*/
import java.io.*;
import org.eclipse.core.runtime.*;
import org.eclipse.jdt.core.compiler.IProblem;
import org.eclipse.jdt.core.dom.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.*;
import org.eclipse.swt.custom.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.jface.dialogs.*;
import org.eclipse.jface.operation.*;
import java.lang.reflect.*;
public class ASTExplorer extends Composite {
private Text addressControl;
private Tree treeControl;
private StyledText textControl;
private StyledText errorsTextControl;
private IProblem[] problems;
private Color blue;
private Color red;
public ASTExplorer(Composite parent,int style) {
super(parent,style);
this.problems = new IProblem[0];
this.blue = getDisplay().getSystemColor(SWT.COLOR_BLUE);
this.red = getDisplay().getSystemColor(SWT.COLOR_RED);
GridLayout gridLayout = new GridLayout();
super.setLayout(gridLayout);
Composite composite = new Composite(this,SWT.NONE);
gridLayout = new GridLayout();
gridLayout.numColumns = 3;
composite.setLayout(gridLayout);
composite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
Button button = new Button(composite,SWT.PUSH);
button.setText("File...");
button.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_END));
button.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
Shell shell = ((Button)event.widget).getShell();
FileDialog dialog = new FileDialog(shell,SWT.PRIMARY_MODAL | SWT.OPEN);
dialog.setText("Java Source File");
dialog.setFilterExtensions(new String[] {"*.java"});
String file = dialog.open();
if (file == null) return;
addressControl.setText(file);
go();
}
});
this.addressControl = new Text(composite,SWT.BORDER);
this.addressControl.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
button = new Button(composite,SWT.PUSH);
button.setText("Go");
button.getShell().setDefaultButton(button);
button.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_END));
button.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent event) {
go();
}
});
SashForm sashFormVertical = new SashForm(this,SWT.VERTICAL);
sashFormVertical.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL |
GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_FILL));
SashForm sashFormHorizontal = new SashForm(sashFormVertical,SWT.HORIZONTAL);
sashFormHorizontal.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.GRAB_VERTICAL |
GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_FILL));
this.treeControl = new Tree(sashFormHorizontal,SWT.BORDER | SWT.SINGLE);
this.treeControl.setLayoutData(new GridData(GridData.GRAB_VERTICAL | GridData.VERTICAL_ALIGN_FILL));
this.treeControl.addSelectionListener(new SelectionAdapter() {
public void widgetSelected(SelectionEvent e) {
// first reset any previous selections
StyleRange styleRange = new StyleRange();
styleRange.start = 0;
styleRange.length = textControl.getCharCount();
textControl.setStyleRange(styleRange);
// select text
int startSelection = -1;
Tree tree = (Tree) e.widget;
Display display = tree.getDisplay();
TreeItem[] items = tree.getSelection();
for (int i=0; i < items.length; ++i) {
ASTNode node = (ASTNode) items[i].getData(ASTExplorerVisitor.NODE);
if (node != null) {
styleRange = createRange(node.getStartPosition(),node.getLength(),blue);
textControl.setStyleRange(styleRange);
if (startSelection < 0 || styleRange.start < startSelection)
startSelection = styleRange.start;
}
}
if (startSelection >= 0)
textControl.setSelection(startSelection);
// select errors
for (int i=0; i < problems.length; ++i) {
IProblem problem = problems[i];
String msg = problem.getMessage();
styleRange = createRange(problem.getSourceStart(),
problem.getSourceEnd() - problem.getSourceStart() + 1,red);
textControl.setStyleRange(styleRange);
}
}
});
this.textControl = new StyledText(sashFormHorizontal, SWT.BORDER | SWT.READ_ONLY | SWT.H_SCROLL | SWT.V_SCROLL);
this.textControl.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL
| GridData.GRAB_VERTICAL | GridData.HORIZONTAL_ALIGN_FILL
| GridData.VERTICAL_ALIGN_FILL));
this.errorsTextControl = new StyledText(sashFormVertical, SWT.BORDER | SWT.READ_ONLY | SWT.H_SCROLL | SWT.V_SCROLL);
this.errorsTextControl.setLayoutData(new GridData(GridData.GRAB_HORIZONTAL | GridData.HORIZONTAL_ALIGN_FILL));
sashFormVertical.setWeights(new int[]{80, 20});
}
static private StyleRange createRange(int start,int length,Color color) {
StyleRange styleRange = new StyleRange();
styleRange.start = start;
styleRange.length = length;
styleRange.fontStyle = SWT.BOLD;
styleRange.foreground = color;
return styleRange;
}
private void go() {
try {
SetFile(addressControl.getText());
}
catch (InterruptedException e) {
reset();
}
catch (InvocationTargetException e) {
reset();
showError(e.getTargetException());
}
catch (Exception e) {
reset();
showError(e);
}
}
private void reset() {
this.treeControl.removeAll();
this.textControl.setText("");
this.errorsTextControl.setText("");
this.problems = new IProblem[0];
}
private void SetFile(final String path) throws InterruptedException, InvocationTargetException {
reset();
ProgressMonitorDialog dialog = new ProgressMonitorDialog(getShell());
dialog.run(true, true, new IRunnableWithProgress() {
public void run(final IProgressMonitor monitor) throws InvocationTargetException {
try {
File file = new File(path);
BufferedReader in = new BufferedReader(new FileReader(file));
StringBuffer buffer = new StringBuffer();
String line = null;
while (null != (line = in.readLine())) {
buffer.append("\t" + line);
buffer.append("\n");
if (monitor.isCanceled()) return;
}
ASTParser parser = ASTParser.newParser(AST.JLS2);
if (monitor.isCanceled()) return;
parser.setKind(ASTParser.K_COMPILATION_UNIT);
if (monitor.isCanceled()) return;
final String text = buffer.toString();
parser.setSource(text.toCharArray());
if (monitor.isCanceled()) return;
final CompilationUnit node = (CompilationUnit) parser.createAST(monitor);
if (monitor.isCanceled()) return;
getDisplay().syncExec(new Runnable() {
public void run() {
ASTVisitor visitor = new ASTExplorerVisitor(treeControl,monitor);
node.accept(visitor);
if (!monitor.isCanceled()) {
textControl.setText(text);
IProblem[] errors = node.getProblems();
if (errors != null && errors.length > 0) {
problems = errors;
int startSelection = -1;
StringBuffer msg = new StringBuffer();
for (int i=0; i < problems.length; ++i) {
IProblem problem = problems[i];
StyleRange errorRange = createRange(problem.getSourceStart(),
problem.getSourceEnd() - problem.getSourceStart() + 1,red);
textControl.setStyleRange(errorRange);
if (startSelection < 0 || errorRange.start < startSelection)
startSelection = errorRange.start;
String message = problem.getMessage() + " line: " +
problem.getSourceLineNumber();
msg.append(message);
msg.append("\n");
}
if (startSelection >= 0)
textControl.setSelection(startSelection);
if (msg.length() > 0)
errorsTextControl.setText(msg.toString());
}
}
}
});
}
catch (IOException e) {
throw new InvocationTargetException(e);
}
}
});
}
// do not allow layout modifications
public void setLayout(Layout layout) {
}
private void showError(Throwable e) {
MessageBox msgBox = new MessageBox(addressControl.getShell(),
SWT.APPLICATION_MODAL | SWT.OK | SWT.ICON_ERROR);
msgBox.setText("AST Explorer Error");
String msg = e.getMessage();
if (null == msg)
msg = e.toString();
msgBox.setMessage(msg);
msgBox.open();
}
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("AST Explorer");
shell.setLayout(new FillLayout());
ASTExplorer astExplorer = new ASTExplorer(shell,SWT.NONE);
final Point minimum = shell.computeSize(SWT.DEFAULT,SWT.DEFAULT,true);
shell.addControlListener(new ControlAdapter() {
public void controlResized(ControlEvent e) {
Shell shell = (Shell)e.widget;
Point size = shell.getSize();
boolean change = false;
if (size.x < minimum.x) {
size.x = minimum.x;
change = true;
}
if (size.y < minimum.y) {
size.y = minimum.y;
change = true;
}
if (change)
shell.setSize(size);
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
}
# 1 楼答案
请阅读本课程的javadocs。你跑步时设置了这个库路径吗？Eclipse JAR是否位于要编译和运行的项目的类路径中？如果不是，那就可以解释你的问题了