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/* Copyright (c) 1997-2004 Miller Puckette, krzYszcz, and others.
* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef MIXED_STANDALONE
#include "unstable/standalone.h"
#else
#include "m_pd.h"
#endif
#include "lex.h"
static int lex_nextbyte(t_lex *lx, unsigned char *buf)
{
int ich;
if (lx->l_fp)
{
if ((ich = fgetc(lx->l_fp)) == EOF)
return (0);
}
else if (lx->l_buf)
{
if (lx->l_bufndx < lx->l_bufsize)
ich = lx->l_buf[lx->l_bufndx++];
else
return (0);
}
else return (0);
if (ich)
{
*buf = (unsigned char)ich;
return (1);
}
else
{
lx->l_errbinary = 1;
return (0);
}
}
static void lex_ungetbyte(t_lex *lx, unsigned char ch)
{
if (lx->l_fp)
{
ungetc(ch, lx->l_fp);
}
else if (lx->l_buf)
{
if (lx->l_bufndx > 0)
lx->l_buf[--lx->l_bufndx] = ch;
}
}
/* single pass of binbuf_text(), optionally int-preserving version */
int lex_nextatom(t_lex *lx, t_atom *ap)
{
char buf[1001], *bufp, *ebuf = buf + 1000;
int ready;
unsigned char ch;
ap->a_type = A_NULL;
while ((ready = lex_nextbyte(lx, &ch)) &&
(ch == ' ' || ch == '\n' || ch == '\r' || ch == '\t'));
if (!ready)
{
/* ??? */
if (lx->l_lasttype == A_SEMI)
return (0);
else
ap->a_type = A_SEMI;
}
else if (ch == ';')
ap->a_type = A_SEMI;
else if (ch == ',')
ap->a_type = A_COMMA;
else
{
int floatstate = 0, slash = 0, lastslash = 0, firstslash = (ch == '\\');
bufp = buf;
do
{
*bufp = ch;
lastslash = slash;
slash = (ch == '\\');
if (floatstate >= 0)
{
int digit = (ch >= '0' && ch <= '9'),
dot = (ch == '.'), minus = (ch == '-'),
plusminus = (minus || (ch == '+')),
expon = (ch == 'e' || ch == 'E');
if (floatstate == 0) /* beginning */
{
if (minus) floatstate = 1;
else if (digit) floatstate = 2;
else if (dot) floatstate = 3;
else floatstate = -1;
}
else if (floatstate == 1) /* got minus */
{
if (digit) floatstate = 2;
else if (dot) floatstate = 3;
else floatstate = -1;
}
else if (floatstate == 2) /* got digits */
{
if (dot) floatstate = 4;
else if (expon) floatstate = 6;
else if (!digit) floatstate = -1;
}
else if (floatstate == 3) /* got '.' without digits */
{
if (digit) floatstate = 5;
else floatstate = -1;
}
else if (floatstate == 4) /* got '.' after digits */
{
if (digit) floatstate = 5;
else if (expon) floatstate = 6;
else floatstate = -1;
}
else if (floatstate == 5) /* got digits after . */
{
if (expon) floatstate = 6;
else if (!digit) floatstate = -1;
}
else if (floatstate == 6) /* got 'e' */
{
if (plusminus) floatstate = 7;
else if (digit) floatstate = 8;
else floatstate = -1;
}
else if (floatstate == 7) /* got plus or minus */
{
if (digit) floatstate = 8;
else floatstate = -1;
}
else if (floatstate == 8) /* got digits */
{
if (!digit) floatstate = -1;
}
}
if (!slash) bufp++;
}
while ((ready = lex_nextbyte(lx, &ch)) && bufp != ebuf
&& (slash || (ch != ' ' && ch != '\n' && ch != '\r'
&& ch != '\t' && ch != ',' && ch != ';')));
if (ready && (ch == ',' || ch == ';'))
lex_ungetbyte(lx, ch);
*bufp = 0;
#if 0
fprintf(stderr, "buf %s\n", buf);
#endif
if (*buf == '$' && buf[1] >= '0' && buf[1] <= '9' && !firstslash)
{
for (bufp = buf+2; *bufp; bufp++)
{
if (*bufp < '0' || *bufp > '9')
{
ap->a_type = A_DOLLSYM;
ap->a_w.w_symbol = gensym(buf+1);
break;
}
}
if (ap->a_type == A_NULL)
{
ap->a_type = A_DOLLAR;
ap->a_w.w_index = atoi(buf+1);
}
}
else if (floatstate == 2)
{
if (lx->l_inttype == A_FLOAT)
{
ap->a_type = A_FLOAT;
ap->a_w.w_float = (float)atof(buf);
}
else
{
ap->a_type = lx->l_inttype;
ap->a_w.w_index = atoi(buf);
}
}
else if (floatstate == 4 || floatstate == 5 || floatstate == 8)
{
ap->a_type = A_FLOAT;
ap->a_w.w_float = (float)atof(buf);
}
else
{
ap->a_type = A_SYMBOL;
ap->a_w.w_symbol = gensym(buf);
}
}
lx->l_lasttype = ap->a_type;
return (1);
}
void lex_atomstring(t_atom *ap, char *buf, int bufsize, t_atomtype inttype)
{
char *sp, *bp, *ep;
switch(ap->a_type)
{
case A_SEMI:
strcpy(buf, ";"); break;
case A_COMMA:
strcpy(buf, ","); break;
case A_FLOAT:
sprintf(buf, "%#f", ap->a_w.w_float);
ep = buf + strlen(buf) - 1;
while (ep > buf && *ep == '0') *ep-- = 0;
break;
case A_SYMBOL:
sp = ap->a_w.w_symbol->s_name;
bp = buf;
ep = buf + (bufsize-5);
while (bp < ep && *sp)
{
if (*sp == ';' || *sp == ',' || *sp == '\\' ||
(*sp == '$' && bp == buf && sp[1] >= '0' && sp[1] <= '9'))
*bp++ = '\\';
if ((unsigned char)*sp < 127)
*bp++ = *sp++;
else
/* FIXME this is temporary -- codepage horror */
sprintf(bp, "\\%.3o", (unsigned char)*sp++), bp += 4;
}
if (*sp) *bp++ = '*';
*bp = 0;
break;
case A_DOLLAR:
sprintf(buf, "$%d", ap->a_w.w_index);
break;
case A_DOLLSYM:
sprintf(buf, "$%s", ap->a_w.w_symbol->s_name);
break;
default:
if (ap->a_type == inttype)
sprintf(buf, "%d", ap->a_w.w_index);
else
{
#ifdef MIXED_STANDALONE
fprintf(stderr, "BUG (lex): bad atom type\n");
#else
bug("lex_atomstring (bad atom type)");
#endif
strcpy(buf, "???");
}
}
}
int lex_isbinary(t_lex *lx)
{
return (lx->l_errbinary);
}
void lex_free(t_lex *lx)
{
freebytes(lx, sizeof(*lx));
}
t_lex *lex_new(FILE *fp, t_atomtype inttype)
{
t_lex *lx = (t_lex *)getbytes(sizeof(*lx));
lx->l_fp = fp;
lx->l_buf = 0; /* FIXME */
lx->l_inttype = inttype;
lx->l_lasttype = A_SEMI;
lx->l_errbinary = 0;
return (lx);
}
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