/* pname - parse a symbol/package name */
LOCAL int pname(LVAL fptr,int *pescflag)
{
int mode,ch,i;
LVAL type;
/* initialize */
*pescflag = FALSE;
mode = NORMAL;
i = 0;
/* accumulate the symbol name */
while (mode != DONE) {
/* handle normal mode */
while (mode == NORMAL)
if ((ch = xlgetc(fptr)) == EOF)
mode = DONE;
else if ((type = tentry(ch)) == k_sescape) {
i = storech(buf,i,checkeof(fptr));
*pescflag = TRUE;
}
else if (type == k_mescape) {
*pescflag = TRUE;
mode = ESCAPE;
}
else if (type == k_const
|| (consp(type) && car(type) == k_nmacro))
i = storech(buf,i,islower(ch) ? toupper(ch) : ch);
else
mode = DONE;
/* handle multiple escape mode */
while (mode == ESCAPE)
if ((ch = xlgetc(fptr)) == EOF)
badeof(fptr);
else if ((type = tentry(ch)) == k_sescape)
i = storech(buf,i,checkeof(fptr));
else if (type == k_mescape)
mode = NORMAL;
else
i = storech(buf,i,ch);
}
buf[i] = 0;
/* check for a zero length name */
if (i == 0)
xlerror("zero length name", s_unbound);
/* unget the last character and return it */
xlungetc(fptr,ch);
return (ch);
}
/*
* local function to read an expression
*/
static LVAL _readexpr(tpLspObject pLSP,FILE *f)
{
int ch,ch1,ch2,i;
LVAL p;
char *s;
double dval;
long lval;
spaceat(ch,f);
if( ch == EOF )
{
return NIL;
}
if( ch == pLSP->cClose )
{
return NIL;
}
if( ch == pLSP->cOpen )/* Read a cons node. */
return readcons(pLSP,f);
/**** Note: XLISP allows 1E++10 as a symbol. This is dangerous.
We do not change XLISP (so far), but here I exclude all symbol
names starting with numeral. */
if( const_p1(ch) )/* Read a symbol. */
{
for( i = 0 ; const_p(ch) ; i++ ){
if( storech(pLSP,i,ch) )return NIL;
ch = getC(pLSP,f);
}
UNGETC(ch);
/* Recognize NIL and nil symbols. */
if( !strcmp(BUFFER,"NIL") || !strcmp(BUFFER,"nil") )
return NIL;
p = newsymbol();
s = StrDup( BUFFER );
if( null(p) || s == NULL )return NIL;
setsymbol(p,s);
return p;
}
if( ch == '\"' ){
ch = GETC(f);
storech(pLSP,0,0); /* inititalize the buffer */
if( ch != '\"' )goto SimpleString;
ch = GETC(f);
if( ch != '\"' ){
UNGETC(ch);
ch = '\"';/* ch should hold the first character of the string that is " now */
goto SimpleString;
}
ch = GETC(f);
/* multi line string */
for( i = 0 ; ch != EOF ; i++ ){
if( ch == '\"' ){
ch1 = GETC(f);
ch2 = GETC(f);
if( ch1 == '\"' && ch2 == '\"' )break;
UNGETC(ch2);
UNGETC(ch1);
}
if( ch == '\\' ){
ch = GETC(f);
s = escapers;
while( *s ){
if( *s++ == ch ){
ch = *s;
break;
}
if( *s )s++;
}
}
if( storech(pLSP,i,ch) )return NIL;
ch = GETC(f);
}
p = newstring();
s = StrDup( BUFFER );
if( null(p) || s == NULL )return NIL;
setstring(p,s);
return p;
}
if( ch == '\"' ){/* Read a string. */
ch = GETC(f);/* Eat the " character. */
SimpleString:
for( i = 0 ; ch != '\"' && ch != EOF ; i++ ){
if( ch == '\\' ){
ch = GETC(f);
s = escapers;
while( *s ){
if( *s++ == ch ){
ch = *s;
break;
}
if( *s )s++;
}
}
if( ch == '\n' )return NIL;
if( storech(pLSP,i,ch) )return NIL;
ch = GETC(f);
}
p = newstring();
s = StrDup( BUFFER );
if( null(p) || s == NULL )
{
return NIL;
}
setstring(p,s);
return p;
}
if( numeral1(ch) )
{
for( i = 0 ; isinset(ch,"0123456789+-eE.") ; i++ )
{
if( storech(pLSP,i,ch) )return NIL;
ch = getC(pLSP,f);
}
UNGETC(ch);
cnumeric(BUFFER,&i,&dval,&lval);
switch( i )
{
case 0:
return NIL;
case 1:
/* A float number is coming. */
p = newfloat();
if( null(p) )
{
return NIL;
}
setfloat(p,dval);
return p;
case 2:
/* An integer is coming. */
p = newint();
if( null(p) )
{
return NIL;
}
setint(p,lval);
return p;
default:
return NIL;
}
}
return NIL;
}
