/*
* 12/14/2010
*
* 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.Graphics;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.swing.Icon;
import javax.swing.text.JTextComponent;
import org.fife.rsta.ac.LanguageSupport;
import org.fife.rsta.ac.LanguageSupportFactory;
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.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.NormalInterfaceDeclaration;
import org.fife.rsta.ac.java.rjc.ast.Package;
import org.fife.rsta.ac.java.rjc.ast.TypeDeclaration;
import org.fife.rsta.ac.java.rjc.lang.Type;
import org.fife.ui.autocomplete.BasicCompletion;
import org.fife.ui.autocomplete.CompletionProvider;
import org.fife.ui.autocomplete.EmptyIcon;
import org.fife.ui.autocomplete.ParameterChoicesProvider;
import org.fife.ui.autocomplete.ParameterizedCompletion;
import org.fife.ui.rsyntaxtextarea.RSyntaxTextArea;
import org.fife.ui.rsyntaxtextarea.SyntaxConstants;
/**
* A parameter choices provider for Java methods.<p>
* NOTE: This class is not thread-safe, but it's assumed that it is only
* ever called on the EDT, so it should be a non-issue.
*
* @author Robert Futrell
* @version 1.0
*/
class SourceParamChoicesProvider implements ParameterChoicesProvider {
/**
* The parent {@link JavaCompletionProvider}.
*/
private CompletionProvider provider;
/**
* Adds all accessible fields and getters of a specific type, from an
* extended class or implemented interface.
*
* @param type
* @param jm
* @param pkg
* @param list
*/
private void addPublicAndProtectedFieldsAndGetters(Type type,
JarManager jm, Package pkg, List list) {
// TODO: Implement me.
}
/**
* Gets all local variables, fields, and simple getters defined in a
* class, that are of a specific type, and are accessible from a given
* offset.
*
* @param ncd The class.
* @param type The type that the variables, fields, and (return value of)
* getters must be.
* @param offs The offset of the caret.
* @return The list of stuff, or an empty list if none are found.
*/
public List getLocalVarsFieldsAndGetters(NormalClassDeclaration ncd,
String type, int offs) {
List members = new ArrayList();
if (!ncd.getBodyContainsOffset(offs)) {
return members;
}
// First, if the offset is in a method, get any local variables in
// that method.
Method method = ncd.getMethodContainingOffset(offs);
if (method!=null) {
// Parameters to the method
for (Iterator i=method.getParameterIterator(); i.hasNext(); ) {
FormalParameter param = (FormalParameter)i.next();
Type paramType = param.getType();
if (isTypeCompatible(paramType, type)) {
//members.add(param.getName());
members.add(new LocalVariableCompletion(provider, param));
}
}
// Local variables in the method
CodeBlock body = method.getBody();
if (body!=null) { // Should always be true?
CodeBlock block = body.getDeepestCodeBlockContaining(offs);
List vars = block.getLocalVarsBefore(offs);
for (Iterator i=vars.iterator(); i.hasNext(); ) {
LocalVariable var = (LocalVariable)i.next();
Type varType = var.getType();
if (isTypeCompatible(varType, type)) {
//members.add(var.getName());
members.add(new LocalVariableCompletion(provider, var));
}
}
}
}
// Next, any fields/getters taking no parameters (for simplicity)
// in this class.
for (Iterator i=ncd.getMemberIterator(); i.hasNext(); ) {
Member member = (Member)i.next();
if (member instanceof Field) {
Type fieldType = member.getType();
if (isTypeCompatible(fieldType, type)) {
//members.add(member.getName());
members.add(new FieldCompletion(provider, (Field)member));
}
}
else { // Method
method = (Method)member;
if (isSimpleGetter(method)) {
if (isTypeCompatible(method.getType(), type)) {
//members.add(member.getName() + "()");
members.add(new MethodCompletion(provider, method));
}
}
}
}
return members;
}
/**
* {@inheritDoc}
*/
public List getParameterChoices(JTextComponent tc,
ParameterizedCompletion.Parameter param) {
// Get the language support for Java
LanguageSupportFactory lsf = LanguageSupportFactory.get();
LanguageSupport support = lsf.getSupportFor(SyntaxConstants.
SYNTAX_STYLE_JAVA);
JavaLanguageSupport jls = (JavaLanguageSupport)support;
JarManager jm = jls.getJarManager();
// Get the deepest TypeDeclaration AST containing the caret position
// for the source code in the editor.
RSyntaxTextArea textArea = (RSyntaxTextArea)tc;
JavaParser parser = jls.getParser(textArea);
if (parser==null) {
return null;
}
CompilationUnit cu = parser.getCompilationUnit();
if (cu==null) {
return null;
}
int dot = tc.getCaretPosition();
TypeDeclaration typeDec = cu.getDeepestTypeDeclarationAtOffset(dot);
if (typeDec==null) {
return null;
}
List list = null;
Package pkg = typeDec.getPackage();
provider = jls.getCompletionProvider(textArea);
// If we're in a class, we'll have to check for local variables, etc.
if (typeDec instanceof NormalClassDeclaration) {
// Get accessible members of this type.
NormalClassDeclaration ncd = (NormalClassDeclaration)typeDec;
list = getLocalVarsFieldsAndGetters(ncd, param.getType(), dot);
// list = typeDec.getAccessibleMembersOfType(param.getType(), dot);
// Get accessible members of the extended type.
Type extended = ncd.getExtendedType();
if (extended!=null) {
addPublicAndProtectedFieldsAndGetters(extended, jm, pkg, list);
}
// Get accessible members of any implemented interfaces.
for (Iterator i=ncd.getImplementedIterator(); i.hasNext(); ) {
Type implemented = (Type)i.next();
addPublicAndProtectedFieldsAndGetters(implemented,jm,pkg,list);
}
}
// If we're an interface, local vars, etc. don't exist
else if (typeDec instanceof NormalInterfaceDeclaration) {
// Nothing to do
}
// If we're in an enum...
else {//if (typeDec instanceof EnumDeclaration) {
// TODO: Implement me
}
// Check for any public/protected fields/getters in enclosing type.
if (!typeDec.isStatic()) {
// TODO: Implement me.
}
// Add defaults for common types - "0" for primitive numeric types,
// "null" for Objects, etc.
Object typeObj = param.getTypeObject();
// TODO: Not all Parameters have typeObj set to a Type yet! Make me so
if (typeObj instanceof Type) {
Type type = (Type)typeObj;
if (type.isBasicType()) {
if (isPrimitiveNumericType(type)) {
list.add(new SimpleCompletion(provider, "0"));
}
else { // is a "boolean" type
list.add(new SimpleCompletion(provider, "false"));
list.add(new SimpleCompletion(provider, "true"));
}
}
else {
list.add(new SimpleCompletion(provider, "null"));
}
}
// And we're done!
return list;
}
private boolean isPrimitiveNumericType(Type type) {
String str = type.getName(true);
return "byte".equals(str) || "float".equals(str) ||
"double".equals(str) || "int".equals(str) ||
"short".equals(str) || "long".equals(str);
}
/**
* Returns whether a method is a no-argument getter method.
*
* @param method The method.
* @return Whether it is a no-argument getter.
*/
private boolean isSimpleGetter(Method method) {
return method.getParameterCount()==0 &&
method.getName().startsWith("get");
}
/**
* Returns whether a <code>Type</code> and a type name are type
* compatible. This method currently is a sham!
*
* @param type
* @param typeName
* @return
*/
// TODO: Get me working! Probably need better parameters passed in!!!
private boolean isTypeCompatible(Type type, String typeName) {
String typeName2 = type.getName(false);
// Remove generics info for now
// TODO: Handle messy generics cases
int lt = typeName2.indexOf('<');
if (lt>-1) {
String arrayDepth = null;
int brackets = typeName2.indexOf('[', lt);
if (brackets>-1) {
arrayDepth = typeName2.substring(brackets);
}
typeName2 = typeName2.substring(lt);
if (arrayDepth!=null) {
typeName2 += arrayDepth;
}
}
return typeName2.equalsIgnoreCase(typeName);
}
/**
* A very simple, low-relevance parameter choice completion. This is
* never used as a general-purpose completion in Java code, as it cannot
* render itself.
*/
private static class SimpleCompletion extends BasicCompletion
implements JavaSourceCompletion {
private Icon ICON = new EmptyIcon(16);
public SimpleCompletion(CompletionProvider provider, String text) {
super(provider, text);
setRelevance(-1);
}
public Icon getIcon() {
return ICON;
}
public void rendererText(Graphics g, int x, int y, boolean selected) {
// Never called
}
}
}