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** GNU Lesser General Public License Usage
**
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** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
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#ifndef CPLUSPLUS_CHECKUNDEFINEDSYMBOLS_H
#define CPLUSPLUS_CHECKUNDEFINEDSYMBOLS_H

#include "CppDocument.h"
#include "LookupContext.h"
#include <ASTVisitor.h>
#include <QtCore/QSet>

namespace CPlusPlus {

class CPLUSPLUS_EXPORT CheckUndefinedSymbols: protected ASTVisitor
{
public:
    CheckUndefinedSymbols(TranslationUnit *unit, const LookupContext &context);
    virtual ~CheckUndefinedSymbols();

    QList<Document::DiagnosticMessage> operator()(AST *ast);

    struct Use { // ### remove me
        unsigned line;
        unsigned column;
        unsigned length;

        Use(unsigned line = 0, unsigned column = 0, unsigned length = 0)
            : line(line), column(column), length(length) {}
    };

    QList<Use> typeUsages() const;

protected:
    using ASTVisitor::visit;
    using ASTVisitor::endVisit;

    bool warning(unsigned line, unsigned column, const QString &text, unsigned length = 0);
    bool warning(AST *ast, const QString &text);

    void checkName(NameAST *ast);
    void checkNamespace(NameAST *name);
    void addTypeUsage(ClassOrNamespace *b, NameAST *ast);
    void addTypeUsage(const QList<Symbol *> &candidates, NameAST *ast);

    virtual bool visit(NamespaceAST *);
    virtual bool visit(UsingDirectiveAST *);
    virtual bool visit(SimpleDeclarationAST *);
    virtual bool visit(NamedTypeSpecifierAST *);

    virtual bool visit(SimpleNameAST *ast);
    virtual bool visit(DestructorNameAST *ast);
    virtual bool visit(QualifiedNameAST *ast);
    virtual bool visit(TemplateIdAST *ast);

    virtual bool visit(TemplateDeclarationAST *ast);
    virtual void endVisit(TemplateDeclarationAST *ast);

    virtual bool visit(TypenameTypeParameterAST *ast);
    virtual bool visit(TemplateTypeParameterAST *ast);

    unsigned startOfTemplateDeclaration(TemplateDeclarationAST *ast) const;
    Scope *findScope(AST *ast) const;

private:
    LookupContext _context;
    QString _fileName;
    QList<Document::DiagnosticMessage> _diagnosticMessages;
    QSet<QByteArray> _potentialTypes;
    QList<ScopedSymbol *> _scopes;
    QList<Use> _typeUsages;
    QList<TemplateDeclarationAST *> _templateDeclarationStack;
};

} // end of namespace CPlusPlus

#endif // CPLUSPLUS_CHECKUNDEFINEDSYMBOLS_H