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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
package scala.tools.scaladoc;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import ch.epfl.lamp.util.Position;
import scalac.Global;
import scalac.ast.Tree;
import scalac.ast.Tree.*;
import scalac.symtab.Kinds;
import scalac.symtab.Modifiers;
import scalac.symtab.Symbol;
import scalac.symtab.TermSymbol;
import scalac.util.*;
/**
* This class is used to merge several compilation units into one
* single tree by creating nodes for java packages. It addionally
* removes any node which is not a declaration.
*/
public class OneTree {
/**
* Global compiler environment.
*/
protected Global global;
/**
* Root node of the unique tree.
*/
protected Node.PackageNode rootNode;
/**
* ..
*/
OneTree(Global global) {
super();
this.global = global;
rootNode = Node.PackageNode(global.definitions.ROOT, new LinkedList());
}
/**
* Main function.
*/
public static Tree apply(Global global) {
return new OneTree(global).enterNodes();
}
/**
* Returns the symbol in the unique tree corresponding to the given symbol.
*
* @param sym
*/
public static Symbol symbol(Symbol sym) {
if (sym.isRoot())
return sym.moduleClass();
else if (sym.isPackage() && (sym.kind == Kinds.CLASS))
return sym.module();
else if (sym.isModuleClass())
return sym.module();
else return sym;
}
/**
* Enters all the nodes in the unique tree.
*/
protected Tree enterNodes() {
for (int i = 0; i < global.units.length; i++)
enter(global.units[i].body);
return rootNode.toTree(global);
}
/**
* Transforms a Java package symbol into a tree definition.
*
* @param sym
* @param body
* @param global
*/
protected static Tree packageSymbolTree(Symbol sym, Tree[] body, Global global) {
if (sym.isRoot())
return global.treeGen.ClassDef(sym.moduleClass(), Tree.EMPTY_ARRAY, Symbol.NONE, body);
else {
Template t = global.make.Template(Position.NOPOS,
Tree.EMPTY_ARRAY,
body);
return global.make.ModuleDef(Position.NOPOS, sym.module(), Tree.Empty, t);
}
}
/**
* Intermediate datastructure representing the unique tree.
*/
protected static class Node {
case PackageNode(Symbol sym, List decls); // package
case TreeNode(Tree tree); // tree (class or object)
/** Lookups for a child node in a package node. */
Node.PackageNode lookup(Symbol sym) {
Iterator it = ((Node.PackageNode) this).decls.iterator();
while (it.hasNext()) {
Node node = (Node) it.next();
switch(node) {
case PackageNode(Symbol sym1, List decls1):
if (sym == sym1)
return (Node.PackageNode) node;
break;
}
}
return null;
}
/** Adds a child node to a package node.
*/
void add(Node node) {
((Node.PackageNode) this).decls.add(node);
}
/** Transforms a node into a tree.
*/
static Tree[] nodeToTree(Node[] nodes, Global global) {
Tree[] trees = new Tree[nodes.length];
for(int i = 0; i < nodes.length; i++)
trees[i] = nodes[i].toTree(global);
return trees;
}
Tree toTree(Global global) {
Tree res = null;
switch(this) {
case TreeNode(Tree tree):
res = tree;
break;
case PackageNode(Symbol sym, List decls):
res = packageSymbolTree(sym,
nodeToTree((Node[]) decls.toArray(new Node[decls.size()]),
global),
global);
break;
}
return res;
}
}
/**
* Returns the node associated with this symbol, creates it if it
* does not exist.
*
* @param sym
*/
protected Node.PackageNode getNode(Symbol sym) {
if (sym.isRoot())
return rootNode;
else {
Node.PackageNode parent = getNode(sym.owner());
Node.PackageNode thisnode = parent.lookup(sym);
if (thisnode == null) {
thisnode = Node.PackageNode(sym, new LinkedList());
parent.add(thisnode);
}
return thisnode;
}
}
/**
* Enter a global declaration in the unique tree.
*
* @param body
*/
protected void enter(Tree[] body) {
for(int i = 0; i< body.length; i++)
enter(body[i]);
}
protected void enter(Tree tree) {
if (tree instanceof PackageDef)
enter(((PackageDef) tree).impl.body);
else if ((tree instanceof ClassDef || tree instanceof ModuleDef) &&
tree.symbol().owner().isPackage())
//getNode(tree.symbol().owner()).add(Node.TreeNode(tree));
getNode(tree.symbol().owner()).add(Node.TreeNode(keepDeclarations(tree, new LinkedList())));
}
/** Do we keep this symbol ?
*/
protected boolean keep(Tree tree) {
return tree.hasSymbol() &&
!tree.symbol().isPrivate() &&
!ScalaSearch.isGenerated(tree.symbol());
}
/**
* Removes nodes which are not declarations in a tree.
*
* @param tree
* @param ownerDeclList
*/
protected Tree keepDeclarations(Tree tree, List ownerDeclList) {
if (!keep(tree) && !(tree instanceof Template))
return null;
switch (tree) {
case ClassDef(int mods, Name name, AbsTypeDef[] tparams, ValDef[][] vparams, Tree tpe, Template impl):
List declList = new LinkedList();
Template impl1 = (Template) keepDeclarations(impl, declList);
//Tree tree1 = global.make.ClassDef(tree.pos, mods, name, tparams, vparams, tpe, impl1);
Tree tree1 = global.treeGen.ClassDef(tree.symbol(), impl1.parents, TermSymbol.newLocalDummy(tree.symbol()), impl1.body);
ownerDeclList.add(tree1);
return tree1;
case ModuleDef(int mods, Name name, Tree tpe, Template impl):
List declList = new LinkedList();
Template impl1 = (Template) keepDeclarations(impl, declList);
assert impl1 != null: "Null impl";
Tree tree1 = global.make.ModuleDef(tree.pos, tree.symbol(), tpe, impl1);
ownerDeclList.add(tree1);
return tree1;
case ValDef(int mods, Name name, Tree tpe, Tree rhs):
ownerDeclList.add(tree);
return tree;
case DefDef(int mods, Name name, AbsTypeDef[] tparams, ValDef[][] vparams, Tree tpe, Tree rhs):
ownerDeclList.add(tree);
return tree;
case AbsTypeDef(_, _, _, _):
case AliasTypeDef(_, _, _, _):
ownerDeclList.add(tree);
return tree;
case Template(Tree[] parents, Tree[] body):
for(int i = 0; i < body.length; i++)
keepDeclarations(body[i], ownerDeclList);
Tree[] ownerDecls = (Tree[]) ownerDeclList.toArray(new Tree[ownerDeclList.size()]);
return global.make.Template(tree.pos, parents, ownerDecls);
default:
return tree;
}
}
}
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