/*     ____ ____  ____ ____  ______                                     *\
**    / __// __ \/ __// __ \/ ____/    SOcos COmpiles Scala             **
**  __\_ \/ /_/ / /__/ /_/ /\_ \       (c) 2002, LAMP/EPFL              **
** /_____/\____/\___/\____/____/                                        **
\*                                                                      */

// $Id$

package scalac.typechecker;

import ch.epfl.lamp.util.Position;
import scalac.*;
import scalac.util.*;
import scalac.ast.*;
import scalac.symtab.*;
import scalac.checkers.*;
import java.util.HashMap;
import java.util.ArrayList;

public class AnalyzerPhase extends Phase {

    final Context startContext;
    final Context consoleContext;
    final HashMap/*<Unit,Context>*/ contexts = new HashMap();
    final ArrayList/*<Unit>*/ newSources = new ArrayList();

    /** Initializes this instance. */
    public AnalyzerPhase(Global global, PhaseDescriptor descriptor) {
        super(global, descriptor);
        Definitions definitions = global.definitions;
        this.startContext = new Context(
            Tree.Empty,
            definitions.ROOT_CLASS,
            definitions.ROOT_CLASS.members(),
            Context.NONE);
        this.startContext.enclClass = this.startContext;

        if (!global.noimports) {
            TreeFactory make = global.make;
            Tree java = make.Ident(Position.NOPOS, Names.java)
                .setSymbol(definitions.JAVA)
                .setType(Type.singleType(definitions.ROOT_TYPE, definitions.JAVA));
            Tree javalang = make.Select(Position.NOPOS, java, Names.lang)
                .setSymbol(definitions.JAVALANG)
                .setType(Type.singleType(java.type, definitions.JAVALANG));
            Tree importjavalang = make.Import(
                Position.NOPOS, javalang, new Name[]{Names.IMPORT_WILDCARD})
                .setSymbol(definitions.JAVALANG)
                .setType(definitions.UNIT_TYPE);
            startContext.imports = new ImportList(
                importjavalang, startContext.scope, startContext.imports);

            Tree scala = make.Ident(Position.NOPOS, Names.scala)
                .setSymbol(definitions.SCALA)
                .setType(Type.singleType(definitions.ROOT_TYPE, definitions.SCALA));
            Tree importscala = make.Import(
                Position.NOPOS, scala, new Name[]{Names.IMPORT_WILDCARD})
                .setSymbol(definitions.SCALA)
                .setType(definitions.UNIT_TYPE);
            startContext.imports = new ImportList(
                importscala, new Scope(), startContext.imports);
        }

        if (!global.noimports && !global.nopredefs) {
            TreeFactory make = global.make;

            Tree scala = make.Ident(Position.NOPOS, Names.scala)
                .setSymbol(definitions.SCALA)
                .setType(Type.singleType(definitions.ROOT_TYPE, definitions.SCALA));
            Symbol scalaPredefSym = definitions.getModule(Names.scala_Predef);
            Tree scalaPredef = make.Select(Position.NOPOS, scala, Names.Predef)
                .setSymbol(scalaPredefSym)
                .setType(Type.singleType(scala.type, scalaPredefSym));

            Tree importscalaPredef = make.Import(
                Position.NOPOS, scalaPredef, new Name[]{Names.IMPORT_WILDCARD})
                .setSymbol(scalaPredefSym)
                .setType(definitions.UNIT_TYPE);
            startContext.imports = new ImportList(
                importscalaPredef, new Scope(), startContext.imports);
        }

        this.consoleContext = new Context(
            Tree.Empty,
            definitions.ROOT_CLASS,
            definitions.ROOT_CLASS.members(),
            startContext);
    }

    public void addConsoleImport(Global global, Symbol module) {
        Definitions definitions = global.definitions;
        TreeFactory make = global.make;

        Tree console = make.Ident(Position.NOPOS, module.name)
            .setSymbol(module)
            .setType(Type.singleType(definitions.ROOT_TYPE, module));

        Tree importConsole = make.Import(
            Position.NOPOS, console, new Name[]{Names.IMPORT_WILDCARD})
            .setSymbol(module)
            .setType(definitions.UNIT_TYPE);
        consoleContext.imports = new ImportList(
            importConsole, new Scope(), consoleContext.imports);
    }

    public void apply(Unit[] units) {
        new Analyzer(global, this).apply(units);
    }

    public void lateEnter(Global global, Unit unit, Symbol symbol) {
        new Analyzer(global, this).lateEnter(unit, symbol);
    }

    public Checker[] postCheckers(Global global) {
        return new Checker[] {
            new CheckSymbols(global),
            new CheckTypes(global),
            new CheckOwners(global),
            new CheckNames(global)
        };
    }
}