cqlparserstate.h

Pegasus is an open-source implementationof the DMTF CIM and WBEM standards. It is designed to be por

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// Author: Humberto Rivero ([e-mail]) 
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// Modified By:
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//%/////////////////////////////////////////////////////////////////////////////

#ifndef Pegasus_CQLParserState_h
#define Pegasus_CQLParserState_h

#include <Pegasus/Common/Config.h>
#include <Pegasus/Common/ArrayInternal.h>
#include <Pegasus/CQL/CQLSelectStatement.h>

#ifdef PEGASUS_USE_EXPERIMENTAL_INTERFACES

PEGASUS_NAMESPACE_BEGIN

/** This is an internal structure used for holding parser state information
    during parsing (while inside the WQLParser::parse() method). Instances
    of this class are created and destroyed by WQLParser::parse().
*/
struct CQLParserState
{
    //
    // Text containing SELECT statement (must be null-terminated).
    //

    const char* text;

    //
    // Size in bytes (including null terminator) of the text.
    //

    Uint32 textSize;

    //
    // Offset to current parser position in the above text.
    //

    Uint32 offset;

    //
    // The output object being initialized during parsing. This object is
    // set to point to the statement argument passed to the WQLParser::parse()
    // method.
    //

    CQLSelectStatement* statement;

    //
    // Set to true when there is an error (set by WQL_error()).
    //

    Boolean error;

    //
    // Error message if any (set by WQL_error()).
    //

    String errorMessage;

    //
    // A list of strings created by lexer. These are deleted by the
    // WQLParser when cleaning up in the parse() method. It is not possible
    // to reliably clean them up anywhere else due to potential parse errors
    // which prevent YACC actions (which might attempt to free them) from
    // being reached. These strings are outstanding in the sense that they
    // need to be cleaned up (not in the sense that they are excellent examples
    // of strings).
    //

    Array<char*> outstandingStrings;

    //
    // This tracks the current token position within the Select Statement being parsed
    // This is incremented and cleared in CQL.l
    //
    Uint32 currentTokenPos;

    //
    // This tracks the token number we are curently processing.
    // This is incremented and cleared in CQL.l
    //
    Uint32 tokenCount;

    //
    // This tracks the current rule in String format in the Select Statement we are currently parsing
    // This is updated with each production in CQL.y
    //
    String currentRule;

};

PEGASUS_NAMESPACE_END
#endif
#endif /* Pegasus_CQLParserState_h */