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/*****************************************************************************
Small parser. It supports all the functions found in ML's parser except the
use of ,base.
Created by Burton Radons <loth@pacificcoast.net>.
Size of code with gcc 2.8.1 and -O2: 3224 bytes.
*****************************************************************************/
#include <math.h>
#include <setjmp.h>
#define Uses_ctype
#define Uses_stdio
#define Uses_stdlib
#define Uses_string
#define CLY_DoNotDefineUTypes
#include <compatlayer.h>
#define isintvar(STR) (STR == '_' || (STR >= 'a' && STR <= 'z') || (STR >= 'A' && STR <= 'Z') || (STR >= '0' && STR <= '9'))
#define isexpr(STR) (!isintvar (STR))
#define opsdo(NAME, EXPR) if (matchops (NAME)) EXPR
#ifdef TVComp_GCC
#define ltype long long
#define lprint "ll"
#endif
#if defined(TVComp_BCPP) || defined(TVComp_MSC)
#define ltype __int64
#define lprint "i64"
#endif
#define ftype long double
#define fprint "L"
static char *str, *ret;
static jmp_buf jmp;
static int pradix;
typedef ftype (*funtype) (ftype a);
#define easy(NAME) static ftype fun_##NAME (ftype a) { return NAME (a); }
easy (sin); easy (cos); easy (tan); easy (sinh); easy (cosh); easy (tanh); easy (asin);
easy (acos); easy (atan); easy (log); easy (log10); easy (exp); easy (abs); easy (sqrt);
easy (ceil); easy (floor);
#undef easy
#define easy(NAME, RADIX) static ftype fun_##NAME (ftype a) { pradix = RADIX; return a; }
easy (bin, 2); easy (oct, 8); easy (dec, 10); easy (hex, 16);
#undef easy
static char *funn [] = { "sin", "cos", "tan", "sinh", "cosh", "tanh", "asin", "acos",
"atan", "log", "log10", "exp", "abs", "sqrt", "ceil", "floor",
"bin", "oct", "dec", "hex" };
static funtype funp [] = { fun_sin, fun_cos, fun_tan, fun_sinh, fun_cosh, fun_tanh, fun_asin,
fun_acos, fun_atan, fun_log, fun_log10, fun_exp, fun_abs, fun_sqrt,
fun_ceil, fun_floor, fun_bin, fun_oct, fun_dec, fun_hex };
#define nfun (int) (sizeof (funn) / sizeof (*funn))
static ftype expr (void);
static void error (int num)
{
longjmp (jmp, num);
}
static void skipspace (void)
{
while (isspace (*str))
str ++;
}
int matchops (char *name)
{
skipspace ();
if (strncmp (str, name, strlen (name)))
return 0;
str += strlen (name);
return 1;
}
static ftype readnum (void)
{
int c, len;
char *top, *end;
ftype val;
skipspace ();
if (*str == '.' || (*str >= '0' && *str <= '9'))
{
if (*str == '0')
{
if (*++ str == 'x')
return strtol (str + 1, &str, 16);
else if (*str == 'b')
return strtol (str + 1, &str, 2);
else if (*str != '.')
return strtol (str, &str, 8);
}
return strtod (str, &str);
}
else if (isexpr (*str))
{
opsdo ("-", return -readnum ());
else opsdo ("~", return ~(ltype) readnum ());
else if (matchops ("("))
{
val = expr ();
if (!matchops (")"))
error (-3);
return val;
}
}
else
{
for (top = str; isintvar (*str); str ++); end = str;
if (!matchops ("("))
error (-3);
val = expr ();
if (!matchops (")"))
error (-3);
for (c = 0; c < nfun; c ++)
if ((int) (end - top) == (len = strlen (funn [c])) && !strncasecmp (top, funn [c], len))
return funp [c] (val);
}
error (-1);
return 0;
}
static ftype term (int lvl)
{
ftype val;
if (lvl -- < 0)
return readnum ();
val = term (lvl);
while (1)
{
switch (lvl + 1)
{
case 0: opsdo ("**", val = pow (val, term (lvl)));
else return val;
break;
case 1: opsdo ("*", val *= term (lvl));
else opsdo ("/", val /= term (lvl));
else opsdo ("%", val = fmod (val, term (lvl)));
else return val;
break;
case 2: opsdo ("+", val += term (lvl));
else opsdo ("-", val -= term (lvl));
else return val;
break;
case 3: opsdo ("<<", val = (ltype) val << (ltype) term (lvl));
else opsdo (">>", val = (ltype) val >> (ltype) term (lvl));
else return val;
break;
case 4: opsdo ("&", val = (ltype) val & (ltype) term (lvl));
else return val;
break;
case 5: opsdo ("^", val = (ltype) val ^ (ltype) term (lvl));
else return val;
break;
case 6: opsdo ("|", val = (ltype) val | (ltype) term (lvl));
else return val;
break;
}
}
}
static ftype expr (void)
{
return term (6);
}
static char ret_buffer[140];
/* Evaluate str, printing the result to ret, return -1 on failure */
int eval (char *_str, char **_ret)
{
ftype val;
int c;
pradix = 10;
str = _str;
*_ret = ret_buffer;
ret = ret_buffer;
if ((c = setjmp (jmp)))
return c;
val = expr ();
if (*str != '\0' && *str != '\n')
error (-3);
if (pradix == 10)
sprintf (ret, "%.10" fprint "g", val);
else if (pradix == 16)
sprintf (ret, "0x%" lprint "X", (ltype) val);
else if (pradix == 8)
sprintf (ret, "0%" lprint "o", (ltype) val);
else if (pradix == 2)
{
ltype bin = val;
*ret ++ = '0';
*ret ++ = 'b';
for (c = 0; bin >> c; c ++);
if (c == 0)
*ret ++ = '0';
ret += c;
*ret -- = '\0';
for (; bin; bin >>= 1)
*ret -- = (bin & 1) + '0';
}
return 0;
}
#ifdef TEST
int main (int argc, char *argv [])
{
char buf [256], *res, *s;
int c;
printf ("Write expression, get answer.\n");
while (fgets (buf, 256, stdin) == buf)
{
for (s=buf; *s && *s!='\n'; s++); *s=0;
c = eval (buf, &res);
if (c == 0)
printf (" = %s\n", res);
else
printf (" Error %d\n", c);
}
return 0;
}
#endif /* TEST */
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