JavaScriptCore-7600.1.4.16.1.tar.gz

[apple/javascriptcore.git] / parser / SourceProvider.h

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 *
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 *
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 *     notice, this list of conditions and the following disclaimer.
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#ifndef SourceProvider_h
#define SourceProvider_h

#include <wtf/PassOwnPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/text/TextPosition.h>
#include <wtf/text/WTFString.h>

namespace JSC {

    class SourceProvider : public RefCounted<SourceProvider> {
    public:
        static const intptr_t nullID = 1;
        
        JS_EXPORT_PRIVATE SourceProvider(const String& url, const TextPosition& startPosition);

        JS_EXPORT_PRIVATE virtual ~SourceProvider();

        virtual const String& source() const = 0;
        String getRange(int start, int end) const
        {
            return source().substringSharingImpl(start, end - start);
        }

        const String& url() { return m_url; }
        TextPosition startPosition() const { return m_startPosition; }
        intptr_t asID()
        {
            ASSERT(this);
            if (!this) // Be defensive in release mode.
                return nullID;
            if (!m_id)
                getID();
            return m_id;
        }

        bool isValid() const { return m_validated; }
        void setValid() { m_validated = true; }

    private:

        JS_EXPORT_PRIVATE void getID();
        Vector<size_t>& lineStarts();

        String m_url;
        TextPosition m_startPosition;
        bool m_validated : 1;
        uintptr_t m_id : sizeof(uintptr_t) * 8 - 1;
    };

    class StringSourceProvider : public SourceProvider {
    public:
        static PassRefPtr<StringSourceProvider> create(const String& source, const String& url, const TextPosition& startPosition = TextPosition::minimumPosition())
        {
            return adoptRef(new StringSourceProvider(source, url, startPosition));
        }

        virtual const String& source() const override
        {
            return m_source;
        }

    private:
        StringSourceProvider(const String& source, const String& url, const TextPosition& startPosition)
            : SourceProvider(url, startPosition)
            , m_source(source)
        {
        }

        String m_source;
    };
    
} // namespace JSC

#endif // SourceProvider_h