netcdf-c/ncgen/data.h

/*********************************************************************
 *   Copyright 2009, UCAR/Unidata
 *   See netcdf/COPYRIGHT file for copying and redistribution conditions.
 *********************************************************************/

#ifndef DATA_H
#define DATA_H 1

#ifndef NO_STDARG
#  include <stdarg.h>
#else
#  include <varargs.h>
#endif

/* nmemonic*/
#define TOPLEVEL 1

/* Forward types */
struct Datalist;
struct Symbol;
struct Dimset;
typedef struct Generator Generator;

/* any one possible value*/
typedef union Constvalue {
    struct Datalist* compoundv; /* NC_COMPOUND*/
    char charv;                 /* NC_CHAR*/
    signed char int8v;          /* NC_BYTE*/
    unsigned char uint8v;       /* NC_UBYTE*/
    short int16v;               /* NC_SHORT*/
    unsigned short uint16v;     /* NC_USHORT*/
    int int32v;                 /* NC_INT*/
    unsigned int uint32v;       /* NC_UINT*/
    long long int64v;           /* NC_INT64*/
    unsigned long long uint64v; /* NC_UINT64*/
    float floatv;               /* NC_FLOAT*/
    double doublev;             /* NC_DOUBLE*/
    struct Stringv {		/* NC_STRING*/
	int len;
	char* stringv; 
    } stringv;
    struct Opaquev {     /* NC_OPAQUE*/
	int len; /* length as originally written (rounded to even number)*/
	char* stringv; /*as  constant was written*/
		      /* (padded to even # chars >= 16)*/
		      /* without leading 0x*/
    } opaquev;
    struct Symbol* enumv;   /* NC_ECONST*/
} Constvalue;

typedef struct Constant {
    nc_type 	  nctype;
    int		  lineno;
    Constvalue    value;
    int           filled; /* was this originally NC_FILLVALUE? */
} Constant;

typedef struct Datalist {
    struct Datalist* next; /* chain of all known datalists*/
    int           readonly; /* data field is shared with another Datalist*/
    size_t  length; /* |data| */
    size_t  alloc;  /* track total allocated space for data field*/
    Constant*     data; /* actual list of constants constituting the datalist*/
    /* Track various values associated with the datalist*/
    /* (used to be in Constvalue.compoundv)*/
    struct Vlen {
        struct Symbol* schema; /* type/var that defines structure of this*/
        unsigned int count; /* # of vlen basetype instances*/
	unsigned int uid;       /* unique id for NC_VLEN*/
    } vlen;
} Datalist;

/* Define a structure to track
   location of current read point in the Datalist sequence
   In effect, we are parsing the data sequence.
   Push and pop of data sources is supported (see srcpush() below).*/
typedef struct Datasrc {
    Constant*    data;     /* duplicate pointer; so do not free.*/
    int index;        
    int length;
    int spliced;           /* Was this list spliced into our parent ? */
    struct Datasrc* prev; /* linked list for debugging */
} Datasrc;

/* Define a holder for passing a start/count array */
struct Vlendata {
    char* data;
    unsigned long count;
};
extern struct Vlendata* vlendata;

/* from: data.c */
int issublist(Datasrc* src);
int isstring(Datasrc* src);
int isfillvalue(Datasrc* src);
int istype(Datasrc* src, nc_type);
int isstringable(nc_type nctype);

Datasrc* datalist2src(Datalist* list);
Datasrc* const2src(Constant*);
Constant list2const(Datalist*);
Datalist* const2list(Constant* con);
void freedatasrc(Datasrc* src);

void srcpush(Datasrc*);
void srcpushlist(Datasrc* src, Datalist* cmpd);
void srcpop(Datasrc*);
void srcsetfill(Datasrc* ds, Datalist* list);

int       datalistline(Datalist*);
#define   datalistith(dl,i) ((dl)==NULL?NULL:((i) >= (dl)->length?NULL:&(dl)->data[i]))

Constant* srcnext(Datasrc*);
int srcmore(Datasrc*);
int srcline(Datasrc* ds);

#define islistconst(con) ((con)!=NULL && (con)->nctype == NC_COMPOUND)
#define isfillconst(con) ((con)!=NULL && (con)->nctype == NC_FILLVALUE)
#define constline(con) (con==NULL?0:(con)->lineno)

Constant* emptystringconst(int,Constant*);

Constant cloneconstant(Constant* con); /* shallow clone*/

void alignbuffer(struct Constant* prim, Bytebuffer* buf);

/* Code dump support procedures */
void bbindent(Bytebuffer*,const int);
void bbprintf(Bytebuffer*,const char *fmt, ...); /* append */
void bbprintf0(Bytebuffer*,const char *fmt, ...); /* clear, then append*/
/* Following dump to codebuffer */
void codeprintf(const char *fmt, ...);
void codedump(Bytebuffer*);
void codepartial(const char*);
void codeline(const char*);
void codelined(int n,const char*);
void codeflush(void); /* flush codebuffer to stdout */

void commify(Bytebuffer* buf);
char* word(char* p, Bytebuffer* buf);

/* Provide buffers for language based generators */
extern Bytebuffer* codebuffer; /* buffer over the std output */
extern Bytebuffer* stmt; /* single stmt text generation */

#ifdef FASTDATASRC
#define srcpeek(ds) ((ds)==NULL || (ds)->index >= (ds)->max?NULL:(ds)->data+(ds)->index)
#else
Constant* srcpeek(Datasrc*);
#endif

/* Aliases */
#define srcincr(src) srcnext(src)
#define srcget(src) srcpeek(src)

extern Constant nullconstant;
extern Constant fillconstant;

/* From genchar.c */
void gen_charattr(Datalist*, Bytebuffer*);
void gen_charvlen(Datalist*, Bytebuffer*);
void gen_chararray(struct Dimset*, Datalist*, Bytebuffer*, Datalist* fillsrc);
#ifndef CHARBUG
void gen_leafchararray(struct Dimset*,int,Datalist*,Bytebuffer* databuf, Datalist* fillsrc);
#endif

/* Mnemonic */
#define UNKNOWN ((size_t)0)

typedef enum ListClass {
    LISTDATA, LISTATTR, LISTVLEN, LISTCOMPOUND, LISTFIELDARRAY
} ListClass;

struct Generator {
    void* state;
        int (*charconstant)(Generator*,Bytebuffer*,...);
        int (*constant)(Generator*,Constant*,Bytebuffer*,...);
        int (*listbegin)(Generator*,ListClass,size_t,Bytebuffer*,int*,...);
        int (*list)(Generator*,ListClass,int,size_t,Bytebuffer*,...);
        int (*listend)(Generator*,ListClass,int,size_t,Bytebuffer*,...);
	int (*vlendecl)(Generator*,Bytebuffer*,struct Symbol*,int,size_t,...);
        int (*vlenstring)(Generator*,Bytebuffer*,int*,size_t*,...);
};

extern int generator_getstate(Generator*,void**);
extern int generator_reset(Generator*,void*);

typedef int (*Writer)(Generator*,struct Symbol*,Bytebuffer*,int,size_t*,size_t*);

extern void generate_attrdata(struct Symbol*, Generator*, Writer writer, Bytebuffer*);
extern void generate_vardata(struct Symbol*, Generator*, Writer writer,Bytebuffer*);
extern void generate_basetype(struct Symbol*,Constant*,Bytebuffer*,Datalist*,Generator*);


#endif /*DATA_H*/