/*
* 05/09/2012
*
* Copyright (C) 2012 Robert Futrell
* robert_futrell at users.sourceforge.net
* http://fifesoft.com/rsyntaxtextarea
*
* This library is distributed under a modified BSD license. See the included
* RSTALanguageSupport.License.txt file for details.
*/
package org.fife.rsta.ac.java;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.List;
import javax.swing.UIManager;
import javax.swing.event.HyperlinkEvent;
import org.fife.rsta.ac.LanguageSupportFactory;
import org.fife.rsta.ac.java.classreader.ClassFile;
import org.fife.rsta.ac.java.classreader.FieldInfo;
import org.fife.rsta.ac.java.classreader.MethodInfo;
import org.fife.ui.autocomplete.Completion;
import org.fife.ui.autocomplete.DescWindowCallback;
import org.fife.ui.autocomplete.ExternalURLHandler;
import org.fife.ui.autocomplete.Util;
import org.fife.ui.rsyntaxtextarea.SyntaxConstants;
/**
* Handles hyperlinks that are clicked in Javadoc for code completions. It's
* assumed that the links found were created via
* {@link org.fife.rsta.ac.java.Util#docCommentToHtml(String)}, so that things
* such as "@see" links are interpreted properly.
*
* @author Robert Futrell
* @version 1.0
*/
public class JavadocUrlHandler implements ExternalURLHandler {
/**
* Returns the parent package <code>backupCount</code> levels up from
* the package specified.
*
* @param pkg A package.
* @param backupCount The number of packages "up" to go.
* @return The parent package.
*/
private String doBackups(String pkg, int backupCount) {
int lastDot = pkg.length();
while (lastDot>-1 && backupCount>0) {
lastDot = pkg.lastIndexOf('.', lastDot);
backupCount--;
}
return lastDot>-1 ? pkg.substring(0, lastDot) : "";
}
/**
* Returns the Java language support.
*
* @return The Java language support
*/
private JavaLanguageSupport getJavaLanguageSupport() {
return (JavaLanguageSupport)LanguageSupportFactory.get().
getSupportFor(SyntaxConstants.SYNTAX_STYLE_JAVA);
}
/**
* Returns the anchor portion of a (relative) URL.
*
* @param url The URL.
* @return The anchor, or <code>null</code> if none.
*/
private static final String getAnchor(String url) {
int pound = url.indexOf('#');
return pound>-1 ? url.substring(pound+1) : null;
}
/**
* Gets the arguments from a method signature.
*
* @param methodSignature The method signature.
* @return The arguments, or an empty array if none.
*/
private static final String[] getArgs(String methodSignature) {
String[] args = null;
int lparen = methodSignature.indexOf('(');
if (lparen>-1) {
int rparen = methodSignature.indexOf(')', lparen); // Should be len-1
if (rparen>-1 && rparen>lparen+1) {
String temp = methodSignature.substring(lparen, rparen);
args = temp.split("\\s*,\\s*");
}
}
if (args==null) {
args = new String[0];
}
return args;
}
/**
* Returns the class for a completion (class completions return the class
* itself, member completions return the enclosing class).
*/
private String getClass(Completion c, String desc) {
String clazz = null;
if (c instanceof ClassCompletion) {
clazz = ((ClassCompletion)c).getClassName(true);
}
else if (c instanceof MemberCompletion) {
MemberCompletion mc = (MemberCompletion)c;
clazz = mc.getEnclosingClassName(true);
}
else {
System.err.println("Can't determine class from completion type: " +
c.getClass() + " (" + c.toString() + ") - href: " + desc);
}
return clazz;
}
/**
* Returns the package of the specified completion.
*
* @param c The completion.
* @param desc The description text being parsed. Used for errors if we
* cannot determine the package.
* @return The package.
*/
private String getPackage(Completion c, String desc) {
String pkg = null;
if (c instanceof ClassCompletion) {
pkg = ((ClassCompletion)c).getPackageName();
}
else if (c instanceof MemberCompletion) {
String definedIn = ((MemberCompletion)c).getEnclosingClassName(true);
if (definedIn!=null) {
int lastDot = definedIn.lastIndexOf('.');
if (lastDot>-1) {
pkg = definedIn.substring(0, lastDot);
}
}
}
else {
System.err.println("Can't determine package from completion type: " +
c.getClass() + " (" + c.toString() + ") - href: " + desc);
}
return pkg;
}
/**
* Returns whether the text is a relative URL to other Javadoc.
*
* @param text A link in Javadoc.
* @return Whether the link is a relative path to more Javadoc.
*/
private boolean isRelativeUrl(String text) {
// Javadoc is always ".html", and we support full URL's elsewhere.
final String[] EXTS = { ".html", ".htm" };
for (int i=0; i<EXTS.length; i++) {
if (text.endsWith(EXTS[i]) || text.indexOf(EXTS[i]+"#")>-1 ||
text.indexOf(EXTS[i]+"?")>-1) {
return true;
}
}
return false;
}
/**
* {@inheritDoc}
*/
public void urlClicked(HyperlinkEvent e, Completion c,
DescWindowCallback callback) {
// A "real" URL (starts with http://, for example) should be opened
// in the system browser, not the completion description window.
URL url = e.getURL();
if (url!=null) {
// Try loading in external browser (Java 6+ only).
try {
Util.browse(new URI(url.toString()));
} catch (/*IO*/URISyntaxException ioe) {
UIManager.getLookAndFeel().provideErrorFeedback(null);
ioe.printStackTrace();
}
return;
}
// A relative path URL (no leading "http://") results in a null URL.
// Class should be in the same package as the one we're currently
// viewing. Example: java.lang.String class documentation
String desc = e.getDescription();
//System.out.println(desc);
if (desc!=null) {
if (isRelativeUrl(desc)) {
int ext = desc.indexOf(".htm");
if (ext>-1) {
// Could be <a href="Character.html#section"> link. A
// popular href format is "../../util/Formatter.html#syntax".
// We must determine "relative" package location.
String anchor = getAnchor(desc);
String clazz = desc.substring(0, ext);
int backups = 0;
while (clazz.startsWith("../")) {
backups++;
clazz = clazz.substring(3);
}
clazz = clazz.replace('/', '.');
String pkg = getPackage(c, desc);
if (pkg!=null) {
clazz = doBackups(pkg, backups) + "." + clazz;
JavaLanguageSupport jls = getJavaLanguageSupport();
ClassFile cf = jls.getJarManager().getClassEntry(clazz);
if (cf!=null) {
ClassCompletion cc = new ClassCompletion(c.getProvider(), cf);
callback.showSummaryFor(cc, anchor);
}
}
}
}
// Could be format "com.mycompany.pkg.MyClass", with optional
// #method() (for example, @see's).
else {
JavaLanguageSupport jls = getJavaLanguageSupport();
String clazz = desc;
String member = null;
int pound = desc.indexOf('#');
if (pound>-1) { // TODO: Handle properly
member = clazz.substring(pound+1);
clazz = clazz.substring(0, pound);
}
// Just a class name, i.e. "String", "java.util.regex.Pattern".
if (member==null) {
boolean guessedPackage = false;
if (clazz.indexOf('.')==-1) {
String pkg = getPackage(c, desc);
if (pkg!=null) {
clazz = pkg + "." + clazz;
}
guessedPackage = true;
}
ClassFile cf = jls.getJarManager().getClassEntry(clazz);
if (cf==null && guessedPackage) {
// Wasn't in the same package as "c", try java.lang
int lastDot = clazz.lastIndexOf('.');
clazz = "java.lang." + clazz.substring(lastDot+1);
cf = jls.getJarManager().getClassEntry(clazz);
}
if (cf!=null) {
ClassCompletion cc = new ClassCompletion(c.getProvider(), cf);
callback.showSummaryFor(cc, null);
}
else {
UIManager.getLookAndFeel().provideErrorFeedback(null);
System.err.println("Unknown class: " + clazz);
}
}
// Member specified, such as "String#format(...)",
// "java.util.regex.Pattern.compile(...)", or "#method()".
else {
boolean guessedPackage = false;
if (pound==0) { // Member of this class (i.e. "#foobar(bas)")
// "clazz" was incorrect previously in this case
clazz = getClass(c, desc);
}
else { // i.e. "String#CASE_INSENSITIVE_ORDER"
// If no package specified, assume clazz is in the same
// package as the currently displayed completion.
if (clazz.indexOf('.')==-1) {
String pkg = getPackage(c, desc);
if (pkg!=null) {
clazz = pkg + "." + clazz;
}
guessedPackage = true;
}
}
ClassFile cf = jls.getJarManager().getClassEntry(clazz);
if (cf==null && guessedPackage) {
// Wasn't in the same package as "c", try java.lang
int lastDot = clazz.lastIndexOf('.');
clazz = "java.lang." + clazz.substring(lastDot+1);
cf = jls.getJarManager().getClassEntry(clazz);
}
if (cf!=null) {
Completion memberCompletion = null;
int lparen = member.indexOf('(');
if (lparen==-1) { // A field, or method with args omitted
FieldInfo fi = cf.getFieldInfoByName(member);
if (fi!=null) { // Try fields first, it's most likely
memberCompletion = new FieldCompletion(c.getProvider(), fi);
}
else { // Try methods second
List miList = cf.getMethodInfoByName(member, -1);
if (miList!=null && miList.size()>0) {
MethodInfo mi = (MethodInfo)miList.get(0);// Just show the first if multiple
memberCompletion = new MethodCompletion(c.getProvider(), mi);
}
}
}
else {
String[] args = getArgs(member);
String methodName = member.substring(0, lparen);
List miList = cf.getMethodInfoByName(methodName, args.length);
if (miList!=null && miList.size()>0) {
if (miList.size()>1) {
// TODO: Pick correct overload based on args
System.err.println("Multiple overload support not yet implemented");
}
else {
MethodInfo mi = (MethodInfo)miList.get(0);
memberCompletion = new MethodCompletion(c.getProvider(), mi);
}
}
}
if (memberCompletion!=null) {
callback.showSummaryFor(memberCompletion, null);
}
}
else {
UIManager.getLookAndFeel().provideErrorFeedback(null);
System.err.println("Unknown class: " + clazz +
" (href: " + desc + ")");
}
}
}
}
}
}