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**
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** General Public License version 2.1 as published by the Free Software
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#ifndef CPLUSPLUS_LOOKUPCONTEXT_H
#define CPLUSPLUS_LOOKUPCONTEXT_H

#include "CppDocument.h"
#include <QPair>

namespace CPlusPlus {

class CPLUSPLUS_EXPORT LookupContext
{
public:
    LookupContext(Control *control = 0);

    LookupContext(Symbol *symbol,
                  Document::Ptr expressionDocument,
                  Document::Ptr thisDocument,
                  const Snapshot &snapshot);

    bool isValid() const;

    Control *control() const;
    Symbol *symbol() const;
    Document::Ptr expressionDocument() const;
    Document::Ptr thisDocument() const;
    Document::Ptr document(const QString &fileName) const;
    Snapshot snapshot() const;

    QList<Symbol *> resolve(Name *name) const
    { return resolve(name, visibleScopes()); }

    QList<Symbol *> resolveNamespace(Name *name) const
    { return resolveNamespace(name, visibleScopes()); }

    QList<Symbol *> resolveClass(Name *name) const
    { return resolveClass(name, visibleScopes()); }

    QList<Symbol *> resolveClassOrNamespace(Name *name) const
    { return resolveClassOrNamespace(name, visibleScopes()); }

    enum ResolveMode {
        ResolveSymbol           = 0x01,
        ResolveClass            = 0x02,
        ResolveNamespace        = 0x04,
        ResolveClassOrNamespace = ResolveClass  | ResolveNamespace,
        ResolveAll              = ResolveSymbol | ResolveClassOrNamespace
    };

    QList<Symbol *> resolve(Name *name, const QList<Scope *> &visibleScopes,
                            ResolveMode mode = ResolveAll) const;

    QList<Symbol *> resolveNamespace(Name *name, const QList<Scope *> &visibleScopes) const
    { return resolve(name, visibleScopes, ResolveNamespace); }

    QList<Symbol *> resolveClass(Name *name, const QList<Scope *> &visibleScopes) const
    { return resolve(name, visibleScopes, ResolveClass); }

    QList<Symbol *> resolveClassOrNamespace(Name *name, const QList<Scope *> &visibleScopes) const
    { return resolve(name, visibleScopes, ResolveClassOrNamespace); }

    QList<Scope *> visibleScopes() const
    { return _visibleScopes; }

    QList<Scope *> visibleScopes(const QPair<FullySpecifiedType, Symbol *> &result) const;

    QList<Scope *> expand(const QList<Scope *> &scopes) const;

    void expand(const QList<Scope *> &scopes, QList<Scope *> *expandedScopes) const;

    void expand(Scope *scope, const QList<Scope *> &visibleScopes,
                QList<Scope *> *expandedScopes) const;

    void expandNamespace(Namespace *namespaceSymbol,
                         const QList<Scope *> &visibleScopes,
                         QList<Scope *> *expandedScopes) const;

    void expandClass(Class *classSymbol,
                     const QList<Scope *> &visibleScopes,
                     QList<Scope *> *expandedScopes) const;

    void expandBlock(Block *blockSymbol,
                     const QList<Scope *> &visibleScopes,
                     QList<Scope *> *expandedScopes) const;

    void expandFunction(Function *functionSymbol,
                        const QList<Scope *> &visibleScopes,
                        QList<Scope *> *expandedScopes) const;

    void expandEnumOrAnonymousSymbol(ScopedSymbol *scopedSymbol,
                                     QList<Scope *> *expandedScopes) const;

private:
    QList<Symbol *> resolveQualifiedNameId(QualifiedNameId *q,
                                           const QList<Scope *> &visibleScopes,
                                           ResolveMode mode) const;

    QList<Symbol *> resolveOperatorNameId(OperatorNameId *opId,
                                          const QList<Scope *> &visibleScopes,
                                          ResolveMode mode) const;

    QList<Scope *> resolveNestedNameSpecifier(QualifiedNameId *q,
                                               const QList<Scope *> &visibleScopes) const;

    Identifier *identifier(const Name *name) const;

    QList<Scope *> buildVisibleScopes();

    void buildVisibleScopes_helper(Document::Ptr doc, QList<Scope *> *scopes,
                                   QSet<QString> *processed);

    static bool maybeValidSymbol(Symbol *symbol,
                                 ResolveMode mode,
                                 const QList<Symbol *> &candidates);

private:
    Control *_control;

    // The current symbol.
    Symbol *_symbol;

    // The current expression.
    Document::Ptr _expressionDocument;

    // The current document.
    Document::Ptr _thisDocument;

    // All documents.
    Snapshot _snapshot;

    // Visible scopes.
    QList<Scope *> _visibleScopes;
};

} // end of namespace CPlusPlus

#endif // CPLUSPLUS_LOOKUPCONTEXT_H
