/* plist - parse a list */
LOCAL LVAL plist(LVAL fptr)
{
LVAL val,expr,lastnptr,nptr;
/* protect some pointers */
xlstkcheck(2);
xlsave(val);
xlsave(expr);
/* keep appending nodes until a closing paren is found */
for (lastnptr = NIL; nextch(fptr) != ')'; )
/* get the next expression */
switch (readone(fptr,&expr)) {
case EOF:
badeof(fptr);
case TRUE:
/* check for a dotted tail */
if (expr == s_dot) {
/* make sure there's a node */
if (lastnptr == NIL)
xlfail("invalid dotted pair");
/* parse the expression after the dot */
if (!xlread(fptr,&expr,TRUE))
badeof(fptr);
rplacd(lastnptr,expr);
/* make sure its followed by a close paren */
if (nextch(fptr) != ')')
xlfail("invalid dotted pair");
}
/* otherwise, handle a normal list element */
else {
nptr = consa(expr);
if (lastnptr == NIL)
val = nptr;
else
rplacd(lastnptr,nptr);
lastnptr = nptr;
}
break;
}
/* skip the closing paren */
xlgetc(fptr);
/* restore the stack */
xlpopn(2);
/* return successfully */
return (val);
}
nyx_rval nyx_eval_expression(const char *expr_string)
{
LVAL expr = NULL;
nyx_expr_string = expr_string;
nyx_expr_len = strlen(nyx_expr_string);
nyx_expr_pos = 0;
nyx_result = NULL;
nyx_parse_error_flag = 0;
xlprot1(expr);
/* setup the error return */
xlbegin(&nyx_cntxt,CF_TOPLEVEL|CF_CLEANUP|CF_BRKLEVEL,(LVAL)1);
if (setjmp(nyx_cntxt.c_jmpbuf))
goto finish;
while(nyx_expr_pos < nyx_expr_len) {
expr = NULL;
/* read an expression */
if (!xlread(getvalue(s_stdin), &expr, FALSE))
break;
#if 0
/* save the input expression (so the user can refer to it
as +, ++, or +++) */
xlrdsave(expr);
#endif
/* evaluate the expression */
nyx_result = xleval(expr);
}
xlflush();
finish:
xlend(&nyx_cntxt);
xlpop(); /* unprotect expr */
/* reset the globals to their initial state */
obarray = nyx_old_obarray;
setvalue(xlenter("S"), NULL);
gc();
return nyx_get_type(nyx_result);
}
/* xread - read an expression */
LVAL xread(void)
{
LVAL fptr,eof,rflag,val;
/* get file pointer and eof value */
fptr = (moreargs() ? xlgetfile() : getvalue(s_stdin));
eof = (moreargs() ? xlgetarg() : NIL);
rflag = (moreargs() ? xlgetarg() : NIL);
xllastarg();
/* read an expression */
if (!xlread(fptr,&val,rflag != NIL))
val = eof;
/* return the expression */
return (val);
}
static int breakloop(char *hdr, char *cmsg, char *emsg, NODE *arg, int cflag)
{
NODE ***oldstk,*expr,*val;
CONTEXT cntxt;
int type;
xlerrprint(hdr,cmsg,emsg,arg);
xlflush();
if (((s_tracenable)->n_info.n_xsym.xsy_value)) {
val = ((s_tlimit)->n_info.n_xsym.xsy_value);
xlbaktrace(((val) && (val)->n_type == 5) ? (int)((val)->n_info.n_xint.xi_int) : -1);
}
oldstk = xlsave(&expr,(NODE **)0);
xldebug++;
xlbegin(&cntxt,8|16|32,true);
for (type = 0; type == 0; ) {
if (type = setjmp(cntxt.c_jmpbuf))
switch (type) {
case 8:
xlflush();
type = 0;
continue;
case 16:
continue;
case 32:
if (cflag) {
stdputstr("[ continue from break loop ]\n");
continue;
}
else xlabort("this error can't be continued");
}
if (!xlread(((s_stdin)->n_info.n_xsym.xsy_value),&expr,0)) {
type = 16;
break;
}
expr = xleval(expr);
xlprint(((s_stdout)->n_info.n_xsym.xsy_value),expr,1);
xlterpri(((s_stdout)->n_info.n_xsym.xsy_value));
}
xlend(&cntxt);
xldebug--;
xlstack = oldstk;
if (type == 16) {
stdputstr("[ abort to previous level ]\n");
xlsignal(0,(NODE *)0);
}
}
main(int argc, char **argv)
{
CONTEXT cntxt;
NODE *expr;
int i;
osinit("XLISP version 1.6, Copyright (c) 1985, by David Betz");
xlbegin(&cntxt,64|8,(NODE *) 1);
if (setjmp(cntxt.c_jmpbuf)) {
printf("fatal initialization error\n");
osfinish();
exit(1);
}
xlinit();
xlend(&cntxt);
xlbegin(&cntxt,64|8,true);
if (setjmp(cntxt.c_jmpbuf) == 0)
xlload("init.lsp",0,0);
if (setjmp(cntxt.c_jmpbuf) == 0)
for (i = 1; i < argc; i++)
if (!xlload(argv[i],1,0))
xlfail("can't load file");
xlsave(&expr,(NODE **)0);
while (1) {
if (i = setjmp(cntxt.c_jmpbuf)) {
if (i == 64)
stdputstr("[ back to the top level ]\n");
((s_evalhook)->n_info.n_xsym.xsy_value = ((NODE *)0));
((s_applyhook)->n_info.n_xsym.xsy_value = ((NODE *)0));
xldebug = 0;
xlflush();
}
if (!xlread(((s_stdin)->n_info.n_xsym.xsy_value),&expr,0))
break;
expr = xleval(expr);
stdprint(expr);
}
xlend(&cntxt);
osfinish ();
exit (0);
}
/* pquote - parse a quoted expression */
LOCAL LVAL pquote(LVAL fptr, LVAL sym)
{
LVAL val,p;
/* protect some pointers */
xlsave1(val);
/* allocate two nodes */
val = consa(sym);
rplacd(val,consa(NIL));
/* initialize the second to point to the quoted expression */
if (!xlread(fptr,&p,TRUE))
badeof(fptr);
rplaca(cdr(val),p);
/* restore the stack */
xlpop();
/* return the quoted expression */
return (val);
}
nyx_rval nyx_eval_expression(const char *expr_string)
{
LVAL expr = NULL;
#if defined(NYX_MEMORY_STATS) && NYX_MEMORY_STATS
printf("\nnyx_eval_expression before\n");
xmem();
#endif
nyx_result = NULL;
nyx_result_type = nyx_error;
// Check argument
if (!expr_string || !strlen(expr_string)) {
return nyx_get_type(nyx_result);
}
nyx_expr_string = expr_string;
nyx_expr_len = strlen(nyx_expr_string);
nyx_expr_pos = 0;
// Protect the expression from being garbage collected
xlprot1(expr);
// Setup a new context
xlbegin(&nyx_cntxt, CF_TOPLEVEL|CF_CLEANUP|CF_BRKLEVEL|CF_ERROR, s_true);
// Set the context jump destination
if (setjmp(nyx_cntxt.c_jmpbuf)) {
// If the script is cancelled or some other condition occurs that causes
// the script to exit and return to this level, then we don't need to
// restore the previous context.
goto finish;
}
while (nyx_expr_pos < nyx_expr_len) {
expr = NULL;
// Read an expression
if (!xlread(getvalue(s_stdin), &expr, FALSE)) {
break;
}
#if 0
/* save the input expression (so the user can refer to it
as +, ++, or +++) */
xlrdsave(expr);
#endif
// Evaluate the expression
nyx_result = xleval(expr);
}
// This will unwind the xlisp context and restore internals to a point just
// before we issued our xlbegin() above. This is important since the internal
// xlisp stacks will contain pointers to invalid objects otherwise.
//
// Also note that execution will jump back up to the statement following the
// setjmp() above.
xljump(&nyx_cntxt, CF_TOPLEVEL, NIL);
// Never reached
finish:
xlflush();
xlpop(); // unprotect expr
gc();
#if defined(NYX_MEMORY_STATS) && NYX_MEMORY_STATS
printf("\nnyx_eval_expression after\n");
xmem();
#endif
return nyx_get_type(nyx_result);
}
/* xlload - load a file of xlisp expressions */
int xlload(char *fname, int vflag, int pflag)
{
char fullname[STRMAX+1];
char *ptr;
LVAL fptr,expr;
XLCONTEXT cntxt;
FILE *fp;
int sts;
/* protect some pointers */
xlstkcheck(2);
xlsave(fptr);
xlsave(expr);
/* space for copy + extension? */
if (strlen(fname) > STRMAX - 4) goto toolong;
strcpy(fullname,fname);
#ifdef WINDOWS
#ifdef WINGUI
if (strcmp(fullname, "*") == 0) {
if (sfn_valid) {
strcpy(fullname, save_file_name);
} else {
strcpy(fullname, "*.*");
}
}
if (strcmp(fullname, "*.*") == 0) {
char *name = getfilename(NULL, "lsp", "r", "Load file");
if (name) {
strcpy(fullname, name);
strcpy(save_file_name, name);
sfn_valid = TRUE;
} else {
xlpopn(2);
return FALSE;
}
}
#endif
/* replace "/" with "\" so that (current-path) will work */
for (ptr = fullname; *ptr; ptr++) {
if (*ptr == '/') *ptr = '\\';
}
#endif
/* default the extension if there is room */
if (needsextension(fullname)) {
strcat(fullname,".lsp");
}
/* allocate a file node */
fptr = cvfile(NULL);
/* open the file */
if ((fp = osaopen(fullname,"r")) == NULL) {
#ifdef UNIX
if (fname[0] != '/') {
char *paths = getenv("XLISPPATH");
if (!paths || !*paths) {
char msg[512];
sprintf(msg, "\n%s\n%s\n%s\n%s\n%s\n",
"Warning: XLISP failed to find XLISPPATH in the environment.",
"If you are using Nyquist, probably you should cd to the",
"nyquist directory and type:",
" setenv XLISPPATH `pwd`/runtime:`pwd`/lib",
"or set XLISPPATH in your .login or .cshrc file.");
errputstr(msg);
}
/* make sure we got paths, and the list is not empty */
while (paths && *paths) {
char *ptr = fullname;
/* skip over separator */
while (*paths == ':') paths++;
/* scan next directory into fullname */
while (*paths && (*paths != ':')) {
if ((ptr - fullname) >= STRMAX) goto toolong;
*ptr++ = *paths++;
}
/* add "/" if needed */
if (ptr[-1] != '/') *ptr++ = '/';
/* append the file name */
if ((ptr - fullname) + strlen(fname) + 4 > STRMAX)
goto toolong;
strcpy(ptr, fname);
/* append the .lsp extension */
if (needsextension(fullname)) {
strcat(fullname, ".lsp");
}
if (fp = osaopen(fullname, "r")) goto gotfile;
}
}
#endif
#ifdef WINDOWS
/* is this a relative path? */
if (fname[0] != '\\' && (strlen(fname) < 2 || fname[1] != ':')) {
#define paths_max 1024
char paths[paths_max];
char *p = paths;
get_xlisp_path(paths, paths_max);
/* make sure we got paths, and the list is not empty */
if (!*p) {
sprintf(paths, "\n%s\n%s\n%s\n",
"Warning: XLISP failed to find XLISPPATH in the Registry.",
"You should follow the installation instructions. Enter an",
"empty string if you really want no search path.");
errputstr(paths);
*p = 0;
}
while (*p) {
char *ptr = fullname;
/* skiip over separator */
while (*p == ',') p++;
/* scan next directory into fullname */
while (*p && (*p != ',')) {
if ((ptr - fullname) >= STRMAX) goto toolong;
*ptr++ = *p++;
}
/* add "\" if needed */
if (ptr[-1] != '\\') *ptr++ = '\\';
/* append the file name */
if ((ptr - fullname) + strlen(fname) + 4 > STRMAX)
goto toolong;
strcpy(ptr, fname);
/* append the .lsp extension */
if (needsextension(fullname)) {
strcat(fullname, ".lsp");
}
/* printf("Trying to open \"%s\"\n", fullname); */
if (fp = osaopen(fullname, "r")) goto gotfile;
}
}
#endif
#ifdef MACINTOSH
/* is this a relative path? I don't know how to do this
* correctly, so we'll assume it's relative if there is no
* embedded colon (:)
*/
if (strchr(fname, ':') == NULL) {
#define paths_max 1024
char paths[paths_max];
char *p = paths;
int prefs_found = false;
get_xlisp_path(paths, paths_max, &prefs_found);
/* make sure we got paths, and the list is not empty */
if (!*p) {
if (prefs_found) {
sprintf(paths, "\n%s\n%s\n%s\n",
"Warning: XLISP failed to find XLISPPATH in XLisp Preferences.",
"You should probably delete XLisp Preferences and let XLisp",
"create a new one for you.");
} else {
sprintf(paths, "\n%s\n%s\n%s\n%s\n%s\n",
"Warning: XLISP failed to find XLisp Preferences.",
"You should manually locate and load the file runtime:init.lsp",
"Nyquist will create an XLisp Preferences file to automatically",
"find the file next time. You may edit XLisp Preferences to add",
"additional search paths, using a comma as separator.");
}
errputstr(paths);
*p = 0;
}
while (*p) {
char *ptr = fullname;
/* skiip over separator */
while (*p == ',') p++;
/* scan next directory into fullname */
while (*p && (*p != ',')) {
if ((ptr - fullname) >= STRMAX) goto toolong;
*ptr++ = *p++;
}
/* add ":" if needed */
if (ptr[-1] != ':') *ptr++ = ':';
/* append the file name */
if ((ptr - fullname) + strlen(fname) + 4 > STRMAX)
goto toolong;
strcpy(ptr, fname);
/* append the .lsp extension */
if (needsextension(fullname)) {
strcat(fullname, ".lsp");
}
/* printf("Trying to open \"%s\"\n", fullname); */
if (fp = osaopen(fullname, "r")) goto gotfile;
}
}
#endif
xlpopn(2);
return (FALSE);
}
gotfile:
#ifdef MACINTOSH
/* We found the file ok, call setup_preferences to create
* XLisp Preferences file (this only happens if previous
* attempt to find the file failed
*/
setup_preferences(fullname);
#endif
setfile(fptr,fp);
setvalue(s_loadingfiles, cons(fptr, getvalue(s_loadingfiles)));
setvalue(s_loadingfiles, cons(cvstring(fullname), getvalue(s_loadingfiles)));
/* print the information line */
if (vflag)
{ sprintf(buf,"; loading \"%s\"\n",fullname); stdputstr(buf); }
/* read, evaluate and possibly print each expression in the file */
xlbegin(&cntxt,CF_ERROR,s_true);
if (setjmp(cntxt.c_jmpbuf))
sts = FALSE;
else {
while (xlread(fptr,&expr,FALSE)) {
expr = xleval(expr);
if (pflag)
stdprint(expr);
}
sts = TRUE;
}
xlend(&cntxt);
/* close the file */
osclose(getfile(fptr));
setfile(fptr,NULL);
if (consp(getvalue(s_loadingfiles)) &&
consp(cdr(getvalue(s_loadingfiles))) &&
car(cdr(getvalue(s_loadingfiles))) == fptr) {
setvalue(s_loadingfiles, cdr(cdr(getvalue(s_loadingfiles))));
}
/* restore the stack */
xlpopn(2);
/* return status */
return (sts);
toolong:
xlcerror("ignore file", "file name too long", NIL);
xlpopn(2);
return FALSE;
}
