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/*
* Copyright (C) 2020 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2020 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-runtime-lib
* Created on: 16 сент. 2019 г.
*
* lsp-runtime-lib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* lsp-runtime-lib 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with lsp-runtime-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_EXPR_EXPRESSION_H_
#define LSP_PLUG_IN_EXPR_EXPRESSION_H_
#include <lsp-plug.in/runtime/version.h>
#include <lsp-plug.in/common/status.h>
#include <lsp-plug.in/runtime/LSPString.h>
#include <lsp-plug.in/io/IInSequence.h>
#include <lsp-plug.in/expr/types.h>
#include <lsp-plug.in/expr/Resolver.h>
#include <lsp-plug.in/lltl/darray.h>
#include <lsp-plug.in/lltl/parray.h>
namespace lsp
{
namespace expr
{
struct expr_t;
class Tokenizer;
class Expression
{
private:
Expression & operator = (const Expression &);
public:
enum expr_flags
{
FLAG_NONE = 0,
FLAG_MULTIPLE = 1 << 0,
FLAG_STRING = 1 << 1
};
protected:
typedef struct root_t
{
expr_t *expr;
value_t result;
} root_t;
protected:
Resolver *pResolver;
lltl::darray<root_t> vRoots;
lltl::parray<LSPString> vDependencies;
protected:
void destroy_all_data();
status_t prepend_string(expr_t **expr, const LSPString *str, bool force);
status_t parse_substitution(expr_t **expr, Tokenizer *t);
status_t parse_regular(io::IInSequence *seq, size_t flags);
status_t parse_string(io::IInSequence *seq, size_t flags);
status_t post_process();
status_t scan_dependencies(expr_t *expr);
status_t add_dependency(const LSPString *str);
public:
explicit Expression();
explicit Expression(Resolver *res);
virtual ~Expression();
void destroy();
public:
/**
* Parse the expression
* @param expr string containing expression in UTF-8
* @param flags additional flags
* @return status of operation
*/
status_t parse(const char *expr, size_t flags = FLAG_NONE);
/**
* Parse the expression
* @param expr string containing expression
* @param charset character set, UTF-8 if NULL
* @param flags additional flags
* @return status of operation
*/
status_t parse(const char *expr, const char *charset = NULL, size_t flags = FLAG_NONE);
/**
* Parse the expression
* @param expr string containing expression
* @param flags additional flags
* @return status of operation
*/
status_t parse(const LSPString *expr, size_t flags = FLAG_NONE);
/**
* Parse the expression
* @param seq character input sequence
* @param flags additional flags
* @return status of operation
*/
status_t parse(io::IInSequence *seq, size_t flags = FLAG_NONE);
/**
* Check that expression is valid
* @return true if the expression is valid
*/
inline bool valid() const { return vRoots.size() > 0; };
/**
* Evaluate all the expressions
* @param result pointer to return value of the zero-indexed expression
* @return status of operation
*/
status_t evaluate(value_t *result = NULL);
/**
* Evaluate the specific expression
* @param index expression index
* @param result pointer to return value of the specified expression
* @return status of operation
*/
status_t evaluate(size_t idx, value_t *result = NULL);
/**
* Get number of results
* @return number of results
*/
inline size_t results() const { return vRoots.size(); };
/**
* Get result of the specific expression
* @param result the pointer to store the result
* @param idx the result indes
* @return status of operation
*/
status_t result(value_t *result, size_t idx);
/**
* Get variable resolver
* @return variable resolver
*/
inline Resolver *resolver() { return pResolver; }
/**
* Sett variable resolver
* @param resolver variable resolver
*/
inline void set_resolver(Resolver *resolver) { pResolver = resolver; }
/**
* Get number of dependencies
* @return number of dependencies
*/
inline size_t dependencies() const { return vDependencies.size(); }
/**
* Get dependency
* @param idx the index of dependency
* @return dependency name or NULL
*/
inline const LSPString *dependency(size_t idx) const { return vDependencies.get(idx); }
/**
* Check that expression has dependency
* @param str dependency name
* @return true if expression has dependency
*/
bool has_dependency(const LSPString *str) const;
/**
* Check that expression has dependency
* @param str dependency name
* @return true if expression has dependency
*/
bool has_dependency(const char *str) const;
};
} /* namespace calc */
} /* namespace lsp */
#endif /* LSP_PLUG_IN_EXPR_EXPRESSION_H_ */
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