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// Copyright (c) 2008 Roberto Raggi <roberto.raggi@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include "Symbol.h"
#include "Symbols.h"
#include "Control.h"
#include "Names.h"
#include "TranslationUnit.h"
#include "Literals.h"
#include "MemoryPool.h"
#include "SymbolVisitor.h"
#include "NameVisitor.h"
#include <cstddef>
#include <cassert>

CPLUSPLUS_BEGIN_NAMESPACE

class Symbol::HashCode: protected NameVisitor
{
public:
    HashCode()
        : _value(0)
    { }

    virtual ~HashCode()
    { }

    unsigned operator()(Name *name)
    {
        unsigned previousValue = switchValue(0);
        accept(name);
        return switchValue(previousValue);
    }

protected:
    unsigned switchValue(unsigned value)
    {
        unsigned previousValue = _value;
        _value = value;
        return previousValue;
    }

    virtual void visit(NameId *name)
    { _value = name->identifier()->hashCode(); }

    virtual void visit(TemplateNameId *name)
    { _value = name->identifier()->hashCode(); }

    virtual void visit(DestructorNameId *name)
    { _value = name->identifier()->hashCode(); }

    virtual void visit(OperatorNameId *name)
    { _value = unsigned(name->kind()); }

    virtual void visit(ConversionNameId *)
    { _value = 0; } // ### TODO: implement me

    virtual void visit(QualifiedNameId *name)
    { _value = operator()(name->unqualifiedNameId()); }

private:
    unsigned _value;
};

class Symbol::IdentityForName: protected NameVisitor
{
public:
    IdentityForName()
        : _identity(0)
    { }

    virtual ~IdentityForName()
    { }

    Name *operator()(Name *name)
    {
        Name *previousIdentity = switchIdentity(0);
        accept(name);
        return switchIdentity(previousIdentity);
    }

protected:
    Name *switchIdentity(Name *identity)
    {
        Name *previousIdentity = _identity;
        _identity = identity;
        return previousIdentity;
    }

    virtual void visit(NameId *name)
    { _identity = name; }

    virtual void visit(TemplateNameId *name)
    { _identity = name; }

    virtual void visit(DestructorNameId *name)
    { _identity = name; }

    virtual void visit(OperatorNameId *name)
    { _identity = name; }

    virtual void visit(ConversionNameId *name)
    { _identity = name; }

    virtual void visit(QualifiedNameId *name)
    { _identity = name->unqualifiedNameId(); }

private:
    Name *_identity;
};

Symbol::Symbol(TranslationUnit *translationUnit, unsigned sourceLocation, Name *name)
    : _control(translationUnit->control()),
      _sourceLocation(sourceLocation),
      _sourceOffset(0),
      _name(0),
      _hashCode(0),
      _storage(Symbol::NoStorage),
      _visibility(Symbol::Public),
      _scope(0),
      _index(0),
      _next(0)
{
    if (sourceLocation)
        _sourceOffset = translationUnit->tokenAt(sourceLocation).offset;

    setName(name);
}

Symbol::~Symbol()
{ }

Control *Symbol::control() const
{ return _control; }

TranslationUnit *Symbol::translationUnit() const
{ return _control->translationUnit(); }

void Symbol::visitSymbol(SymbolVisitor *visitor)
{
    if (visitor->preVisit(this))
        visitSymbol0(visitor);
    visitor->postVisit(this);
}

void Symbol::visitSymbol(Symbol *symbol, SymbolVisitor *visitor)
{
    if (! symbol)
        return;

    symbol->visitSymbol(visitor);
}

unsigned Symbol::sourceLocation() const
{ return _sourceLocation; }

unsigned Symbol::sourceOffset() const
{ return _sourceOffset; }

unsigned Symbol::line() const
{
    unsigned line = 0, column = 0;
    StringLiteral *fileId = 0;
    translationUnit()->getPosition(_sourceOffset, &line, &column, &fileId);
    return line;
}

unsigned Symbol::column() const
{
#ifdef CPLUSPLUS_WITH_COLUMNS
    unsigned line = 0, column = 0;
    StringLiteral *fileId = 0;
    translationUnit()->getPosition(_sourceOffset, &line, &column, &fileId);
    return column;
#else
    return 0;
#endif
}

StringLiteral *Symbol::fileId() const
{
    unsigned line = 0, column = 0;
    StringLiteral *fileId = 0;
    translationUnit()->getPosition(_sourceOffset, &line, &column, &fileId);
    return fileId;
}

const char *Symbol::fileName() const
{ return fileId()->chars(); }

unsigned Symbol::fileNameLength() const
{ return fileId()->size(); }

Name *Symbol::identity() const
{
    IdentityForName id;
    return id(_name);
}

Name *Symbol::name() const
{ return _name; }

void Symbol::setName(Name *name)
{
    _name = name;

    if (! _name)
        _hashCode = 0;
    else {
        IdentityForName identityForName;
        HashCode hh;
        _hashCode = hh(identityForName(_name));
    }
}

Scope *Symbol::scope() const
{ return _scope; }

void Symbol::setScope(Scope *scope)
{
    assert(! _scope);
    _scope = scope;
}

unsigned Symbol::index() const
{ return _index; }

Symbol *Symbol::next() const
{ return _next; }

unsigned Symbol::hashCode() const
{ return _hashCode; }

int Symbol::storage() const
{ return _storage; }

void Symbol::setStorage(int storage)
{ _storage = storage; }

int Symbol::visibility() const
{ return _visibility; }

void Symbol::setVisibility(int visibility)
{ _visibility = visibility; }

bool Symbol::isFriend() const
{ return _storage == Friend; }

bool Symbol::isRegister() const
{ return _storage == Register; }

bool Symbol::isStatic() const
{ return _storage == Static; }

bool Symbol::isExtern() const
{ return _storage == Extern; }

bool Symbol::isMutable() const
{ return _storage == Mutable; }

bool Symbol::isTypedef() const
{ return _storage == Typedef; }

bool Symbol::isPublic() const
{ return _visibility == Public; }

bool Symbol::isProtected() const
{ return _visibility == Protected; }

bool Symbol::isPrivate() const
{ return _visibility == Private; }

bool Symbol::isScopedSymbol() const
{ return asScopedSymbol() != 0; }

bool Symbol::isEnum() const
{ return asEnum()  != 0; }

bool Symbol::isFunction() const
{ return asFunction() != 0; }

bool Symbol::isNamespace() const
{ return asNamespace() != 0; }

bool Symbol::isClass() const
{ return asClass() != 0; }

bool Symbol::isForwardClassDeclaration() const
{ return asForwardClassDeclaration() != 0; }

bool Symbol::isBlock() const
{ return asBlock() != 0; }

bool Symbol::isUsingNamespaceDirective() const
{ return asUsingNamespaceDirective() != 0; }

bool Symbol::isUsingDeclaration() const
{ return asUsingDeclaration() != 0; }

bool Symbol::isDeclaration() const
{ return asDeclaration() != 0; }

bool Symbol::isArgument() const
{ return asArgument() != 0; }

bool Symbol::isBaseClass() const
{ return asBaseClass() != 0; }

CPLUSPLUS_END_NAMESPACE