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A library adding code completion and other advanced features for Java, JavaScript, Perl, and other languages to RSyntaxTextArea.

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/*
 * 03/21/2010
 *
 * Copyright (C) 2010 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.awt.Cursor;
import java.awt.Point;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.JTextComponent;

import org.fife.rsta.ac.ShorthandCompletionCache;
import org.fife.rsta.ac.java.buildpath.LibraryInfo;
import org.fife.rsta.ac.java.buildpath.SourceLocation;
import org.fife.rsta.ac.java.classreader.ClassFile;
import org.fife.rsta.ac.java.classreader.FieldInfo;
import org.fife.rsta.ac.java.classreader.MemberInfo;
import org.fife.rsta.ac.java.classreader.MethodInfo;
import org.fife.rsta.ac.java.rjc.ast.CodeBlock;
import org.fife.rsta.ac.java.rjc.ast.CompilationUnit;
import org.fife.rsta.ac.java.rjc.ast.Field;
import org.fife.rsta.ac.java.rjc.ast.FormalParameter;
import org.fife.rsta.ac.java.rjc.ast.ImportDeclaration;
import org.fife.rsta.ac.java.rjc.ast.LocalVariable;
import org.fife.rsta.ac.java.rjc.ast.Member;
import org.fife.rsta.ac.java.rjc.ast.Method;
import org.fife.rsta.ac.java.rjc.ast.NormalClassDeclaration;
import org.fife.rsta.ac.java.rjc.ast.TypeDeclaration;
import org.fife.rsta.ac.java.rjc.lang.Type;
import org.fife.rsta.ac.java.rjc.lang.TypeArgument;
import org.fife.rsta.ac.java.rjc.lang.TypeParameter;
import org.fife.ui.autocomplete.DefaultCompletionProvider;
import org.fife.ui.rsyntaxtextarea.RSyntaxDocument;
import org.fife.ui.rsyntaxtextarea.RSyntaxTextArea;
import org.fife.ui.rsyntaxtextarea.RSyntaxUtilities;
import org.fife.ui.rsyntaxtextarea.Token;


/**
 * Parses a Java AST for code completions.  It currently scans the following:
 * 
 * 
    
 *    
  • Import statements
 *    
  • Method names
 *    
  • Field names
 * 

 *
 * Also, if the caret is inside a method, local variables up to the caret
 * position are also returned.
 *
 * @author Robert Futrell
 * @version 1.0
 */
class SourceCompletionProvider extends DefaultCompletionProvider {

	/**
	 * The parent completion provider.
	 */
	private JavaCompletionProvider javaProvider;

	/**
	 * Used to get information about what classes match imports.
	 */
	private JarManager jarManager;

	private static final String JAVA_LANG_PACKAGE			= "java.lang.*";
	private static final String THIS						= "this";
	
	//Shorthand completions (templates and comments)
	private ShorthandCompletionCache shorthandCache;
	/**
	 * Constructor.
	 */
	public SourceCompletionProvider() {
		this(null);
	}


	/**
	 * Constructor.
	 *
	 * @param jarManager The jar manager for this provider.
	 */
	public SourceCompletionProvider(JarManager jarManager) {
		if (jarManager==null) {
			jarManager = new JarManager();
		}
		this.jarManager = jarManager;
		setParameterizedCompletionParams('(', ", ", ')');
		setAutoActivationRules(false, "."); // Default - only activate after '.'
		setParameterChoicesProvider(new SourceParamChoicesProvider());
	}


	private void addCompletionsForStaticMembers(Set set,
						CompilationUnit cu, ClassFile cf, String pkg) {

		// Check us first, so if we override anything, we get the "newest"
		// version.
		int methodCount = cf.getMethodCount();
		for (int i=0; inull if
	 *         cf represents java.lang.Object (or
	 *         if the super class could not be determined).
	 */
	private ClassFile getClassFileFor(CompilationUnit cu, String className) {

		//System.err.println(">>> Getting class file for: " + className);
		if (className==null) {
			return null;
		}

		ClassFile superClass = null;

		// Determine the fully qualified class to grab
		if (!Util.isFullyQualified(className)) {

			// Check in this source file's package first
			String pkg = cu.getPackageName();
			if (pkg!=null) {
				String temp = pkg + "." + className;
				superClass = jarManager.getClassEntry(temp);
			}

			// Next, go through the imports (order is important)
			if (superClass==null) {
				for (Iterator i=cu.getImportIterator(); i.hasNext(); ) {
					ImportDeclaration id = (ImportDeclaration)i.next();
					String imported = id.getName();
					if (imported.endsWith(".*")) {
						String temp = imported.substring(
								0, imported.length()-1) + className;
						superClass = jarManager.getClassEntry(temp);
						if (superClass!=null) {
							break;
						}
					}
					else if (imported.endsWith("." + className)) {
						superClass = jarManager.getClassEntry(imported);
						break;
					}
				}
			}

			// Finally, try java.lang
			if (superClass==null) {
				String temp = "java.lang." + className;
				superClass = jarManager.getClassEntry(temp);
			}

		}

		else {
			superClass = jarManager.getClassEntry(className);
		}

		return superClass;

	}


	/**
	 * Adds completions for local variables in a method.
	 *
	 * @param set
	 * @param method
	 * @param offs The caret's offset into the source.  This should be inside
	 *        of method.
	 */
	private void addLocalVarCompletions(Set set, Method method, int offs) {

		for (int i=0; iblock.
	 */
	private void addLocalVarCompletions(Set set, CodeBlock block, int offs) {

		for (int i=0; ioffs) {
				break;
			}
		}

	}


	/**
	 * Adds a jar to read from.
	 *
	 * @param info The jar to add.  If this is null, then
	 *        the current JVM's main JRE jar (rt.jar, or classes.jar on OS X)
	 *        will be added.  If this jar has already been added, adding it
	 *        again will do nothing (except possibly update its attached source
	 *        location).
	 * @throws IOException If an IO error occurs.
	 * @see #getJars()
	 * @see #removeJar(File)
	 */
	public void addJar(LibraryInfo info) throws IOException {
		jarManager.addClassFileSource(info);
	}


	/**
	 * Checks whether the user is typing a completion for a String member after
	 * a String literal.
	 *
	 * @param comp The text component.
	 * @param alreadyEntered The text already entered.
	 * @param cu The compilation unit being parsed.
	 * @param set The set to add possible completions to.
	 * @return Whether the user is indeed typing a completion for a String
	 *         literal member.
	 */
	private boolean checkStringLiteralMember(JTextComponent comp,
											String alreadyEntered,
											CompilationUnit cu, Set set) {

		boolean stringLiteralMember = false;

		int offs = comp.getCaretPosition() - alreadyEntered.length() - 1;
		if (offs>1) {
			RSyntaxTextArea textArea = (RSyntaxTextArea)comp;
			RSyntaxDocument doc = (RSyntaxDocument)textArea.getDocument();
			try {
				//System.out.println(doc.charAt(offs) + ", " + doc.charAt(offs+1));
				if (doc.charAt(offs)=='"' && doc.charAt(offs+1)=='.') {
					int curLine = textArea.getLineOfOffset(offs);
					Token list = textArea.getTokenListForLine(curLine);
					Token prevToken = RSyntaxUtilities.getTokenAtOffset(list, offs);
					if (prevToken!=null &&
							prevToken.type==Token.LITERAL_STRING_DOUBLE_QUOTE) {
						ClassFile cf = getClassFileFor(cu, "java.lang.String");
						addCompletionsForExtendedClass(set, cu, cf,
													cu.getPackageName(), null);
						stringLiteralMember = true;
					}
					else {
						System.out.println(prevToken);
					}
				}
			} catch (BadLocationException ble) { // Never happens
				ble.printStackTrace();
			}
		}

		return stringLiteralMember;

	}


	/**
	 * Removes all jars from the "build path."
	 *
	 * @see #removeJar(File)
	 * @see #addClassFileSource(JarInfo)
	 * @see #getJars()
	 */
	public void clearJars() {
		jarManager.clearClassFileSources();
		// The memory used by the completions can be quite large, so go ahead
		// and clear out the completions list so no-longer-needed ones are
		// eligible for GC.
		clear();
	}


	/**
	 * Creates and returns a mapping of type parameters to type arguments.
	 *
	 * @param type The type of a variable/field/etc. whose fields/methods/etc.
	 *        are being code completed, as declared in the source.  This
	 *        includes type arguments.
	 * @param cf The ClassFile representing the actual type of
	 *        the variable/field/etc. being code completed
	 * @return A mapping of type parameter names to type arguments (both
	 *         Strings).
	 */
	private Map createTypeParamMap(Type type, ClassFile cf) {
		Map typeParamMap = null;
		List typeArgs = type.getTypeArguments(type.getIdentifierCount()-1);
		if (typeArgs!=null) {
			typeParamMap = new HashMap();
			List paramTypes = cf.getParamTypes();
			// Should be the same size!  Otherwise, the source code has
			// too many/too few type arguments listed for this type.
			int min = Math.min(paramTypes==null ? 0 : paramTypes.size(),
									typeArgs.size());
			for (int i=0; i0 &&
					comparator.compare(completions.get(start-1), text)==0) {
				start--;
			}
		}

		int end = Collections.binarySearch(completions, text+'{', comparator);
		end = -(end+1);

		return completions.subList(start, end);

		} finally {
			comp.setCursor(Cursor.getPredefinedCursor(Cursor.TEXT_CURSOR));
		}

	}


	/**
	 * Returns the jars on the "build path."
	 *
	 * @return A list of {@link JarInfo}s.  Modifying a JarInfo in
	 *         this list will have no effect on this completion provider; in
	 *         order to do that, you must re-add the jar via
	 *         {@link #addClassFileSource(JarInfo)}. If there are no jars on the
	 *         "build path," this will be an empty list.
	 * @see #addClassFileSource(JarInfo)
	 */
	public List getJars() {
		return jarManager.getClassFileSources();
	}



public SourceLocation  getSourceLocForClass(String className) {
	return jarManager.getSourceLocForClass(className);
}

	/**
	 * Returns whether a method defined by a super class is accessible to
	 * this class.
	 *
	 * @param info Information about the member.
	 * @param pkg The package of the source currently being parsed.
	 * @return Whether or not the method is accessible.
	 */
	private boolean isAccessible(MemberInfo info, String pkg) {

		boolean accessible = false;
		int access = info.getAccessFlags();

		if (org.fife.rsta.ac.java.classreader.Util.isPublic(access) ||
				org.fife.rsta.ac.java.classreader.Util.isProtected(access)) {
			accessible = true;
		}
		else if (org.fife.rsta.ac.java.classreader.Util.isDefault(access)) {
			String pkg2 = info.getClassFile().getPackageName();
			accessible = (pkg==null && pkg2==null) ||
						(pkg!=null && pkg.equals(pkg2));
		}

		return accessible;

	}


	/**
	 * {@inheritDoc}
	 */
	protected boolean isValidChar(char ch) {
		return Character.isJavaIdentifierPart(ch) || ch=='.';
	}


	/**
	 * Loads completions based on the current caret location in the source.  In
	 * other words:
	 * 
	 * 
    
	 *   
  • If the caret is anywhere in a class, the names of all methods and
	 *       fields in the class are loaded.  Methods and fields in super
	 *       classes are also loaded.  TODO: Get super methods/fields added
	 *       correctly by access!
	 *   
  • If the caret is in a field, local variables currently accessible
	 *       are loaded.
	 * 

	 *
	 * @param cu
	 * @param comp
	 * @param alreadyEntered
	 * @param retVal
	 */
	private void loadCompletionsForCaretPosition(CompilationUnit cu,
			JTextComponent comp, String alreadyEntered, Set retVal) {

		// Get completions for all fields and methods of all type declarations.

		//long startTime = System.currentTimeMillis();
		int caret = comp.getCaretPosition();
		//List temp = new ArrayList();
		int start, end;

		int lastDot = alreadyEntered.lastIndexOf('.');
		boolean qualified = lastDot>-1;
		String prefix = qualified ? alreadyEntered.substring(0, lastDot) : null;

		for (Iterator i=cu.getTypeDeclarationIterator(); i.hasNext(); ) {

			TypeDeclaration td = (TypeDeclaration)i.next();
			start = td.getBodyStartOffset();
			end = td.getBodyEndOffset();

			if (caret>start && caret<=end) {
				loadCompletionsForCaretPosition(cu, comp, alreadyEntered,
									retVal, td, prefix, caret);
			}

			else if (caret
	 *   
  • If the caret is anywhere in a class, the names of all methods and
	 *       fields in the class are loaded.  Methods and fields in super
	 *       classes are also loaded.  TODO: Get super methods/fields added
	 *       correctly by access!
	 *   
  • If the caret is in a field, local variables currently accessible
	 *       are loaded.
	 * 
	 *
	 * @param cu
	 * @param comp
	 * @param alreadyEntered
	 * @param retVal
	 */
	private void loadCompletionsForCaretPosition(CompilationUnit cu,
			JTextComponent comp, String alreadyEntered, Set retVal,
			TypeDeclaration td, String prefix, int caret) {

		// Do any child types first, so if any vars, etc. have duplicate names,
		// we pick up the one "closest" to us first.
		for (int i=0; i=method.getBodyStartOffset() && caretnull if
	 *        none.
	 * @param prefix The text up to the current caret position.  This is
	 *        guaranteed to be non-null not equal to
	 *        "this".
	 * @param offs The offset of the caret in the document.
	 */
	private void loadCompletionsForCaretPositionQualified(CompilationUnit cu,
			String alreadyEntered, Set retVal,
			TypeDeclaration td, Method currentMethod, String prefix, int offs) {

		// TODO: Remove this restriction.
		int dot = prefix.indexOf('.');
		if (dot>-1) {
			System.out.println("[DEBUG]: Qualified non-this completions currently only go 1 level deep");
			return;
		}

		// TODO: Remove this restriction.
		else if (!prefix.matches("[A-Za-z_][A-Za-z0-9_\\$]*")) {
			System.out.println("[DEBUG]: Only identifier non-this completions are currently supported");
			return;
		}

		String pkg = cu.getPackageName();
		boolean matched = false;

		for (Iterator j=td.getMemberIterator(); j.hasNext(); ) {

			Member m = (Member)j.next();

			// The prefix might be a field in the local class.
			if (m instanceof Field) {

				Field field = (Field)m;

				if (field.getName().equals(prefix)) {
					//System.out.println("FOUND: " + prefix + " (" + pkg + ")");
					Type type = field.getType();
					if (type.isArray()) {
						ClassFile cf = getClassFileFor(cu, "java.lang.Object");
						addCompletionsForExtendedClass(retVal, cu, cf, pkg, null);
						FieldCompletion fc = FieldCompletion.
							createLengthCompletion(this, type);
						retVal.add(fc);
					}
					else if (!type.isBasicType()) {
						String typeStr = type.getName(true, false);
						ClassFile cf = getClassFileFor(cu, typeStr);
						// Add completions for extended class type chain
						if (cf!=null) {
							Map typeParamMap = createTypeParamMap(type, cf);
							addCompletionsForExtendedClass(retVal, cu, cf, pkg, typeParamMap);
							// Add completions for all implemented interfaces
							// TODO: Only do this if type is abstract!
							for (int i=0; ioffs) {
				break;
			}
		}

	}


	/**
	 * Loads completions for a single import statement.
	 *
	 * @param importStr The import statement.
	 * @param pkgName The package of the source currently being parsed.
	 */
	private void loadCompletionsForImport(Set set, String importStr, String pkgName) {

		if (importStr.endsWith(".*")) {
			String pkg = importStr.substring(0, importStr.length()-2);
			boolean inPkg = pkg.equals(pkgName);
			List classes = jarManager.getClassesInPackage(pkg, inPkg);
			for (Iterator i=classes.iterator(); i.hasNext(); ) {
				ClassFile cf = (ClassFile)i.next();
				set.add(new ClassCompletion(this, cf));
			}
		}

		else {
			ClassFile cf = jarManager.getClassEntry(importStr);
			if (cf!=null) {
				set.add(new ClassCompletion(this, cf));
			}
		}

	}


	/**
	 * Loads completions for all import statements.
	 *
	 * @param cu The compilation unit being parsed.
	 */
	private void loadImportCompletions(Set set, String text,
									CompilationUnit cu) {

		// Fully-qualified completions are handled elsewhere, so no need to
		// duplicate the work here
		if (text.indexOf('.')>-1) {
			return;
		}

		//long startTime = System.currentTimeMillis();

		String pkgName = cu.getPackageName();
		loadCompletionsForImport(set, JAVA_LANG_PACKAGE, pkgName);
		for (Iterator i=cu.getImportIterator(); i.hasNext(); ) {
			ImportDeclaration id = (ImportDeclaration)i.next();
			String name = id.getName();
			if (!JAVA_LANG_PACKAGE.equals(name)) {
				loadCompletionsForImport(set, name, pkgName);
			}
		}
//		Collections.sort(completions);

		//long time = System.currentTimeMillis() - startTime;
		//System.out.println("imports loaded in: " + time);

	}


	/**
	 * Removes a jar from the "build path."
	 *
	 * @param jar The jar to remove.
	 * @return Whether the jar was removed.  This will be false
	 *         if the jar was not on the build path.
	 * @see #addClassFileSource(JarInfo)
	 * @see #getJars()
	 * @see #clearJars()
	 */
	public boolean removeJar(File jar) {
		boolean removed = jarManager.removeClassFileSource(jar);
		// The memory used by the completions can be quite large, so go ahead
		// and clear out the completions list so no-longer-needed ones are
		// eligible for GC.
		if (removed) {
			clear();
		}
		return removed;
	}


	/**
	 * Sets the parent Java provider.
	 * 
	 * @param javaProvider The parent completion provider.
	 */
	void setJavaProvider(JavaCompletionProvider javaProvider) {
		this.javaProvider = javaProvider;
	}


}




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