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/* $Id: expreval.h $ */
/** @file
* IPRT - Expression Evaluator.
*/
/*
* Copyright (C) 2022-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef IPRT_INCLUDED_expreval_h
#define IPRT_INCLUDED_expreval_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include <iprt/types.h>
RT_C_DECLS_BEGIN
/** @defgroup grp_rt_expr_eval RTExprEval - Expression Evaluator
* @ingroup grp_rt
* @{ */
/** Handle to an expression evaluator. */
typedef struct RTEXPREVALINT *RTEXPREVAL;
/** Pointer to an expression evaluator handle. */
typedef RTEXPREVAL *PRTEXPREVAL;
/** NIL expression evaluator handle. */
#define NIL_RTEXPREVAL ((RTEXPREVAL)~(uintptr_t)0)
/**
* Variable getter (supplied by user).
*
* @returns IPRT status code.
* @retval VERR_NOT_FOUND if the variable does not exist.
*/
typedef DECLCALLBACKTYPE(int, FNRTEXPREVALQUERYVARIABLE,(const char *pchName, size_t cchName, void *pvUser, char **ppszValue));
/** Pointer to a variable getter. */
typedef FNRTEXPREVALQUERYVARIABLE *PFNRTEXPREVALQUERYVARIABLE;
/** @name Expression evaluator flags.
* @sa RTExprEvalCreate
* @{ */
/** Default to hexadecimal instead of decimal numbers. */
#define RTEXPREVAL_F_DEFAULT_BASE_16 RT_BIT_64(0)
/** Enables C-ish octal style, i.e. 0777 be read as 0x1ff (in hex). */
#define RTEXPREVAL_F_C_OCTAL RT_BIT_64(1)
/** Enables the 'exists' operator that can be used to check if a path exists.
* @sa RTPathExists */
#define RTEXPREVAL_F_EXISTS_OP RT_BIT_64(2)
/** Valid mask. */
#define RTEXPREVAL_F_VALID_MASK UINT64_MAX(3)
/** @} */
/**
* Creates an expression evaluator.
*
* @returns IPRT status code.
* @param phEval Where to return the handle to the evaluator.
* @param fFlags RTEXPREVAL_F_XXX.
* @param pszName The evaluator name (for logging).
* @param pvUser User argument for callbacks.
* @param pfnQueryVariable Callback for querying variables. Optional.
*/
RTDECL(int) RTExprEvalCreate(PRTEXPREVAL phEval, uint64_t fFlags, const char *pszName,
void *pvUser, PFNRTEXPREVALQUERYVARIABLE pfnQueryVariable);
/**
* Retains a reference to the evaluator.
*
* @returns New reference count, UINT32_MAX if @a hEval is not valid.
* @param hEval Handle to the evaluator.
*/
RTDECL(uint32_t) RTExprEvalRetain(RTEXPREVAL hEval);
/**
* Releases a reference to the evaluator.
*
* @returns New reference count, UINT32_MAX if @a hEval is not valid. (The
* evaluator was destroyed when 0 is returned.)
* @param hEval Handle to the evaluator.
*/
RTDECL(uint32_t) RTExprEvalRelease(RTEXPREVAL hEval);
/**
* Evaluates the given if expression to a boolean result.
*
* @returns IPRT status code
* @param hEval Handle to the evaluator.
* @param pch The expression string. Does not need to be zero
* terminated.
* @param cch The length of the expression. Pass RTSTR_MAX if not
* known.
* @param pfResult Where to return the result.
* @param pErrInfo Where to return additional error info.
*/
RTDECL(int) RTExprEvalToBool(RTEXPREVAL hEval, const char *pch, size_t cch, bool *pfResult, PRTERRINFO pErrInfo);
/**
* Evaluates the given if expression to an integer (signed 64-bit) result.
*
* @returns IPRT status code
* @param hEval Handle to the evaluator.
* @param pch The expression string. Does not need to be zero
* terminated.
* @param cch The length of the expression. Pass RTSTR_MAX if not
* known.
* @param piResult Where to return the result.
* @param pErrInfo Where to return additional error info.
*/
RTDECL(int) RTExprEvalToInteger(RTEXPREVAL hEval, const char *pch, size_t cch, int64_t *piResult, PRTERRINFO pErrInfo);
/**
* Evaluates the given if expression to a string result.
*
* @returns IPRT status code
* @param hEval Handle to the evaluator.
* @param pch The expression string. Does not need to be zero
* terminated.
* @param cch The length of the expression. Pass RTSTR_MAX if not
* known.
* @param ppszResult Where to return the result. This must be freed using
* RTStrFree.
* @param pErrInfo Where to return additional error info.
*/
RTDECL(int) RTExprEvalToString(RTEXPREVAL hEval, const char *pch, size_t cch, char **ppszResult, PRTERRINFO pErrInfo);
/** @} */
RT_C_DECLS_END
#endif /* !IPRT_INCLUDED_expreval_h */
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