reposting of xlisp.h
Jay C. Weber
jcw at cvl.UUCP
Sat Aug 18 00:54:53 AEST 1984
This is a reposting of the header file for the XLISP set of sources,
motivated by several messages from people who never received the
last posting.
Tear at the dotted line, run sh(1) over it.
Jay Weber
..!seismo!rlgvax!cvl!jcw
jcw at cvl.arpa
..!seismo!rochester!jay
jay at rochester.arpa
--------------------------------------------------------
/* xlisp - a small subset of lisp */
/* system specific definitions */
/* DEFEXT define to enable default extension of '.lsp' on 'load' */
/* FGETNAME define if system supports 'fgetname' */
/* NNODES number of nodes to allocate in each request */
/* TDEPTH trace stack depth */
/* KEYMAPCLASS define to include the 'Keymap' class */
/* for the VAX-11 C compiler */
#ifdef vms
#define DEFEXT
#define FGETNAME
#define KEYMAPCLASS
#define NNODES 2000
#define TDEPTH 1000
#endif
/* for the DECUS C compiler */
#ifdef decus
#define DEFEXT
#define KEYMAPCLASS
#define NNODES 200
#define TDEPTH 100
#endif
/* for unix compilers */
#ifdef unix
#define KEYMAPCLASS
#define NNODES 200
#define TDEPTH 100
#endif
/* for the AZTEC C compiler */
#ifdef AZTEC
#define DEFEXT
#define KEYMAPCLASS
#define NNODES 200
#define TDEPTH 100
#define getc(fp) getch(fp)
#define kbin() CPM(6,0xFF)
#define malloc alloc
#endif
/* for the CI_86 PC compiler */
#ifdef CI_86
#define REALS /* Enables real arithmetic code */
/* #define DEBUG Enables debug code */
/* Module XLDEBUG need not be linked
if DEBUG is undefined */
#define DEFEXT
#define KEYMAPCLASS
#define NNODES 200
#define TDEPTH 100
#define strchr index
#endif
/* default important definitions */
#ifndef NNODES
#define NNODES 200
#endif
#ifndef TDEPTH
#define TDEPTH 100
#endif
/* useful definitions */
#define TRUE 1
#define FALSE 0
/* program limits */
#define STRMAX 100 /* maximum length of a string constant */
/* node types */
#define FREE 0
#define SUBR 1
#define LIST 2
#define SYM 3
#define INT 4
#define STR 5
#define OBJ 6
#define FPTR 7
#define KMAP 8
#define REAL 9
/* node flags */
#define MARK 1
#define LEFT 2
/* string types */
#define DYNAMIC 0
#define STATIC 1
/* struct defines */
struct xsym {
char *xsy_name; /* symbol name */
struct node *xsy_value; /* the current value */
};
/* subr node structure */
struct xsubr {
struct node *(*xsu_subr)(); /* pointer to an internal routine */
};
/* list node structure */
struct xlist {
struct node *xl_value; /* value at this node */
struct node *xl_next; /* next node */
};
/* integer node structure */
struct xint {
int xi_int; /* integer value */
};
#ifdef REALS
/* real node structure */
struct xreal {
long float xr_real; /* real value */
};
#endif
/* string node structure */
struct xstr {
int xst_type; /* string type */
char *xst_str; /* string pointer */
};
/* object node structure */
struct xobj {
struct node *xo_obclass; /* class of object */
struct node *xo_obdata; /* instance data */
};
/* file pointer node structure */
struct xfptr {
FILE *xf_fp; /* the file pointer */
};
/* keymap structure */
struct xkmap {
struct node *(*xkm_map)[]; /* selection pointer */
};
/* shorthand macros for accessing node substructures */
/* symbol node */
#define n_symname n_info.n_xsym.xsy_name
#define n_symvalue n_info.n_xsym.xsy_value
/* subr node */
#define n_subr n_info.n_xsubr.xsu_subr
/* list node (and message node and binding node) */
#define n_listvalue n_info.n_xlist.xl_value
#define n_listnext n_info.n_xlist.xl_next
#define n_msg n_info.n_xlist.xl_value
#define n_msgcode n_info.n_xlist.xl_next
#define n_bndsym n_info.n_xlist.xl_value
#define n_bndvalue n_info.n_xlist.xl_next
#define n_left n_info.n_xlist.xl_value
#define n_right n_info.n_xlist.xl_next
#define n_ptr n_info.n_xlist.xl_value
/* integer, real and string nodes */
#define n_int n_info.n_xint.xi_int
#define n_real n_info.n_xreal.xr_real
#define n_str n_info.n_xstr.xst_str
#define n_strtype n_info.n_xstr.xst_type
/* object node */
#define n_obclass n_info.n_xobj.xo_obclass
#define n_obdata n_info.n_xobj.xo_obdata
/* file pointer node */
#define n_fname n_info.n_xfptr.xf_name
#define n_fp n_info.n_xfptr.xf_fp
/* key map node */
#define n_kmap n_info.n_xkmap.xkm_map
/* node structure */
struct node {
char n_type; /* type of node */
char n_flags; /* flag bits */
union { /* value */
struct xsym n_xsym; /* symbol node */
struct xsubr n_xsubr; /* subr node */
struct xlist n_xlist; /* list node */
struct xint n_xint; /* integer node */
#ifdef REALS
struct xreal n_xreal; /* real node */
#endif
struct xstr n_xstr; /* string node */
struct xobj n_xobj; /* object node */
struct xfptr n_xfptr; /* file pointer node */
struct xkmap n_xkmap; /* key map node */
} n_info;
};
#define null_node = {'\0','\0'}
/* external procedure declarations */
extern struct node *xlread(); /* read an expression */
extern struct node *xleval(); /* evaluate an expression */
extern struct node *xlarg(); /* fetch an argument */
extern struct node *xlevarg(); /* fetch and evaluate an argument */
extern struct node *xlmatch(); /* fetch an typed argument */
extern struct node *xlevmatch(); /* fetch and evaluate a typed arg */
extern struct node *xlsend(); /* send a message to an object */
extern struct node *xlmfind(); /* find the method for a message */
extern struct node *xlxsend(); /* execute a message method */
extern struct node *xlenter(); /* enter a symbol into the oblist */
extern struct node *xlsave(); /* generate a stack frame */
extern struct node *xlobsym(); /* find an object's class or instance
variable */
extern struct node *xlclass(); /* enter a class definition */
extern struct node *xlivar(); /* get an instance variable */
extern struct node *xlcvar(); /* get an instance variable */
extern struct node *newnode(); /* allocate a new node */
extern char *stralloc(); /* allocate string space */
extern char *strsave(); /* make a safe copy of a string */
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