#ifndef __FINSH_H__
#define __FINSH_H__

#include <rtthread.h>

/* -- the beginning of option -- */
#define FINSH_NAME_MAX			16		/* max length of identifier */
#define FINSH_NODE_MAX			16		/* max number of node */

#define FINSH_HEAP_MAX			128		/* max length of heap */
#define FINSH_STRING_MAX		128		/* max length of string */
#define FINSH_VARIABLE_MAX		8		/* max number of variable */

#define FINSH_STACK_MAX			128		/* max stack size */
#define FINSH_TEXT_MAX 			128		/* max text segment size */

#define HEAP_ALIGNMENT			4		/* heap alignment */

#define FINSH_GET16(x)    (*(x)) | (*((x)+1) << 8)
#define FINSH_GET32(x)    (*(x)) | (*((x)+1) << 8) | (*((x)+2) << 16) | (*((x)+3) << 24)

#define FINSH_SET16(x, v)			\
    do                          	\
    {                           	\
        *(x)     = (v) & 0x00ff; 	\
        (*((x)+1)) = (v) >> 8;     	\
    } while ( 0 )

#define FINSH_SET32(x, v)						\
    do                                      	\
    {                                       	\
        *(x)     = (v)  & 0x000000ff;        	\
        (*((x)+1)) = ((v) >> 8) & 0x000000ff;  	\
        (*((x)+2)) = ((v) >> 16) & 0x000000ff; 	\
        (*((x)+3)) = ((v) >> 24);              	\
    } while ( 0 )

/* -- the end of option -- */

 /**
 * @defgroup finsh finsh shell
 *
 * finsh is a C-expression shell which gives user access to some symbols present in RT-Thread.
 */
/*@{*/

#if defined(RT_USING_NEWLIB) || defined (RT_USING_MINILIBC)
#include <string.h>
#else
typedef unsigned char  u_char;
typedef unsigned short u_short;
typedef unsigned long  u_long;

#if !defined(__CC_ARM) && !defined(__ICCARM__)
typedef unsigned int size_t;

#ifndef NULL
#define NULL RT_NULL
#endif

#define memset	rt_memset
#define strlen	rt_strlen
#define strncpy	rt_strncpy
#define strncmp	rt_strncmp
#else
#include <string.h>
#endif

int strcmp (const char *s1, const char *s2);
char *strdup(const char *s);

int isalpha( int ch );
int atoi(const char* s);
#endif

#define FINSH_VERSION_MAJOR			0
#define FINSH_VERSION_MINOR			5

/* error code */
#define FINSH_ERROR_OK              0   /** No error */
#define FINSH_ERROR_INVALID_TOKEN	1	/**  Invalid token */
#define FINSH_ERROR_EXPECT_TYPE		2	/** Expect a type */
#define FINSH_ERROR_UNKNOWN_TYPE	3	/** Unknown type */
#define FINSH_ERROR_VARIABLE_EXIST	4	/** Variable exist */
#define FINSH_ERROR_EXPECT_OPERATOR	5	/** Expect a operater */
#define FINSH_ERROR_MEMORY_FULL		6	/** Memory full */
#define FINSH_ERROR_UNKNOWN_OP		7 	/** Unknown operator */
#define FINSH_ERROR_UNKNOWN_NODE	8	/** Unknown node */
#define FINSH_ERROR_EXPECT_CHAR		9	/** Expect a character */
#define FINSH_ERROR_UNEXPECT_END	10	/** Unexpect end */
#define FINSH_ERROR_UNKNOWN_TOKEN	11	/** Unknown token */
#define FINSH_ERROR_NO_FLOAT		12	/** Float not supported */
#define FINSH_ERROR_UNKNOWN_SYMBOL	13	/** Unknown symbol */
#define FINSH_ERROR_NULL_NODE		14	/** Null node */

typedef long (*syscall_func)();

/* system call table */
struct finsh_syscall
{
	const char*		name;		/* the name of system call */
#if defined(FINSH_USING_DESCRIPTION) && defined(FINSH_USING_SYMTAB)
	const char*		desc;		/* description of system call */
#endif
	syscall_func func;		/* the function address of system call */
};
/* system call item */
struct finsh_syscall_item
{
	struct finsh_syscall_item* next;	/* next item */
	struct finsh_syscall syscall;		/* syscall */
};
extern struct finsh_syscall *_syscall_table_begin, *_syscall_table_end;
extern struct finsh_syscall_item *global_syscall_list;

/* find out system call, which should be implemented in user program */
struct finsh_syscall* finsh_syscall_lookup(const char* name);

/* system variable table */
struct finsh_sysvar
{
	const char*		name;		/* the name of variable */
#if defined(FINSH_USING_DESCRIPTION) && defined(FINSH_USING_SYMTAB)
	const char* 	desc;		/* description of system variable */
#endif
	u_char		 type;		/* the type of variable */
	void*		 var ;		/* the address of variable */
};
/* system variable item */
struct finsh_sysvar_item
{
	struct finsh_sysvar_item *next;		/* next item */
	struct finsh_sysvar sysvar;			/* system variable */
};
extern struct finsh_sysvar *_sysvar_table_begin, *_sysvar_table_end;
extern struct finsh_sysvar_item* global_sysvar_list;

/* find out system variable, which should be implemented in user program */
struct finsh_sysvar* finsh_sysvar_lookup(const char* name);

#ifdef FINSH_USING_SYMTAB
	#ifdef FINSH_USING_DESCRIPTION
		#define FINSH_FUNCTION_EXPORT(name, desc)					 \
		const char __fsym_##name##_name[] = #name;					 \
		const char __fsym_##name##_desc[] = #desc;					 \
		const struct finsh_syscall __fsym_##name SECTION("FSymTab")= \
		{							\
			__fsym_##name##_name,	\
			__fsym_##name##_desc,	\
			(syscall_func)&name		\
		};

		#define FINSH_VAR_EXPORT(name, type, desc)					\
		const char __vsym_##name##_name[] = #name;					\
		const char __vsym_##name##_desc[] = #desc;					\
		const struct finsh_sysvar __vsym_##name SECTION("VSymTab")=	\
		{							\
			__vsym_##name##_name,	\
			__vsym_##name##_desc,	\
			type, 					\
			(void*)&name			\
		};
	#else
		#define FINSH_FUNCTION_EXPORT(name, desc)					 \
		const char __fsym_##name##_name[] = #name;					 \
		const struct finsh_syscall __fsym_##name SECTION("FSymTab")= \
		{							\
			__fsym_##name##_name,	\
			(syscall_func)&name		\
		};

		#define FINSH_VAR_EXPORT(name, type, desc)					\
		const char __vsym_##name##_name[] = #name;					\
		const struct finsh_sysvar __vsym_##name SECTION("VSymTab")=	\
		{							\
			__vsym_##name##_name,	\
			type, 					\
			(void*)&name			\
		};
	#endif
#else
	#define FINSH_FUNCTION_EXPORT(name, desc)
	#define FINSH_VAR_EXPORT(name, type, desc)
#endif

struct finsh_token
{
	char eof;
	char replay;

	int  position;
	u_char current_token;

	union {
		char char_value;
		int int_value;
		long long_value;
	} value;
	u_char string[128];

	u_char* line;
};

#define FINSH_IDTYPE_VAR		0x01
#define FINSH_IDTYPE_SYSVAR		0x02
#define FINSH_IDTYPE_SYSCALL	0x04
#define FINSH_IDTYPE_ADDRESS	0x08
struct finsh_node
{
	u_char node_type;	/* node node_type */
	u_char data_type;	/* node data node_type */
	u_char idtype;		/* id node information */

	union {			/* value node */
		char 	char_value;
		short 	short_value;
		int 	int_value;
		long 	long_value;
		void* 	ptr;
	} value;
	union
	{
		/* point to variable identifier or function identifier */
		struct finsh_var	*var;
		struct finsh_sysvar	*sysvar;
		struct finsh_syscall*syscall;
	}id;

	/* sibling and child node */
	struct finsh_node *sibling, *child;
};

struct finsh_parser
{
	u_char* parser_string;

    struct finsh_token token;
	struct finsh_node* root;
};

/**
 * finsh basic data type
 */
enum finsh_type {
	finsh_type_unknown = 0,
	finsh_type_void,		/** void  			*/
	finsh_type_voidp,		/** void pointer  	*/
	finsh_type_char,		/** char  			*/
	finsh_type_uchar,		/** unsigned char  	*/
	finsh_type_charp,		/** char pointer  	*/
	finsh_type_short,		/** short  			*/
	finsh_type_ushort,		/** unsigned short 	*/
	finsh_type_shortp,		/** short pointer  	*/
	finsh_type_int,			/** int 			*/
	finsh_type_uint,		/** unsigned int 	*/
	finsh_type_intp,		/** int pointer 	*/
	finsh_type_long,		/** long 			*/
	finsh_type_ulong,		/** unsigned long 	*/
	finsh_type_longp		/** long pointer 	*/
};

/* init finsh environment */
int finsh_init(struct finsh_parser* parser);
/* flush finsh node, text segment */
int finsh_flush(struct finsh_parser* parser);
/* reset all of finsh */
int finsh_reset(struct finsh_parser* parser);
#ifdef RT_USING_DEVICE
/* set finsh device */
void finsh_set_device(char* device_name);
#endif

/* run finsh parser to generate abstract synatx tree */
void finsh_parser_run (struct finsh_parser* parser, const unsigned char* string);
/* run compiler to compile abstract syntax tree */
int finsh_compiler_run(struct finsh_node* node);
/* run finsh virtual machine */
void finsh_vm_run(void);

/* get variable value */
struct finsh_var* finsh_var_lookup(const char* name);
/* get bottom value of stack */
long finsh_stack_bottom(void);

/* get error number of finsh */
u_char finsh_errno(void);
/* get error string */
const char* finsh_error_string(u_char type);

#ifdef RT_USING_HEAP
/**
 * append a system call to finsh runtime environment
 * @param name the name of system call
 * @param func the function pointer of system call
 */
void finsh_syscall_append(const char* name, syscall_func func);
/**
 * append a system variable to finsh runtime environment
 * @param name the name of system variable
 * @param type the data type of system variable
 * @param addr the address of system variable
 */
void finsh_sysvar_append(const char* name, u_char type, void* addr);
#endif

/*@}*/

#endif
