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/* This is a simple demo program for the S-Lang interpreter. */
#include "config.h"
#include <stdio.h>
#include <math.h>
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#define BENCHMARK_TESTING 0
#if BENCHMARK_TESTING
# include <sys/time.h>
# include <sys/resource.h>
# include <unistd.h>
#endif
#include "slang.h"
static int open_readline (void);
static void close_readline (void);
static void help (void)
{
puts("ALL statements MUST be terminated with a ';' character, e.g., quit();\n");
puts("Available functions:");
puts(" cos, sin, tan, atan, acos, asin, exp, log, sqrt, fabs, log10, pow, PI, E");
puts("\nas well as other intrinsic S-Lang functions.");
puts("See S-Lang language documentation for further details.\n");
SLang_run_hooks ("calc_help", 0);
}
/* The following three functions will be callable from the interpreter */
static void quit_calc (void)
{
close_readline ();
exit (1);
}
static void exit_calc (int *status)
{
close_readline ();
exit (*status);
}
/* Now here is a table that provides the link between the above functions and
the S-Lang interpreter */
static SLang_Intrin_Fun_Type Calc_Intrinsics [] =
{
MAKE_INTRINSIC("quit", quit_calc, SLANG_VOID_TYPE, 0),
MAKE_INTRINSIC_I("exit", exit_calc, SLANG_VOID_TYPE),
MAKE_INTRINSIC("help", help, SLANG_VOID_TYPE, 0),
SLANG_END_INTRIN_FUN_TABLE
};
typedef struct
{
int i_value;
char *s_value;
double d_value;
}
My_Struct_Type;
static My_Struct_Type My_Struct =
{
-41,
NULL,
7.18
};
static My_Struct_Type *My_Struct_Ptr = &My_Struct;
static SLang_IStruct_Field_Type My_Struct_Field_Table [] =
{
MAKE_ISTRUCT_FIELD(My_Struct_Type, i_value, "i", SLANG_INT_TYPE, 0),
MAKE_ISTRUCT_FIELD(My_Struct_Type, s_value, "s", SLANG_STRING_TYPE, 0),
MAKE_ISTRUCT_FIELD(My_Struct_Type, d_value, "d", SLANG_DOUBLE_TYPE, 0),
SLANG_END_ISTRUCT_TABLE
};
static int add_my_struct_type (void)
{
return SLadd_istruct_table (My_Struct_Field_Table,
(VOID_STAR) &My_Struct_Ptr,
"MyS");
}
static int take_input (void);
int main (int argc, char **argv)
{
if ((-1 == SLang_init_all ())
/* || (-1 == SLang_init_import ()) / * dynamic linking */
|| (-1 == add_my_struct_type ())
|| (-1 == SLadd_intrin_fun_table (Calc_Intrinsics, NULL)))
{
fprintf(stderr, "Unable to initialize S-Lang.\n");
exit (1);
}
SLang_Traceback = 1;
if (argc == 1)
SLang_load_file("calc.sl");
while (--argc && !SLang_get_error ())
{
argv++;
SLang_load_file (*argv);
}
fputs("Type 'help();' for help and a list of available functions.\n", stdout);
fputs("All statements must end with a ';' character, e.g, 2*7+3;\n", stdout);
fputs("\nType `quit;' to exit this program.\n", stdout);
if (-1 == open_readline ())
return 1;
while (1)
{
if (SLang_get_error ())
{
SLang_restart (1);
/* SLang_set_error (0); */
}
SLKeyBoard_Quit = 0;
take_input ();
}
}
/* For a detailed explanation of all of this, see slang/demo/useropen.c */
static SLrline_Type *Calc_RLI;
SLang_Load_Type *Readline_Load_Object;
static char *read_using_readline (SLang_Load_Type *x)
{
static char *input_hook = "calc_take_input_hook";
char *prompt, *line;
if (x->parse_level == 0)
{
if ((input_hook != NULL)
&& (-1 == SLang_run_hooks (input_hook, 0)))
{
input_hook = NULL;
return NULL;
}
prompt = "Calc> ";
}
else
prompt = " ";
if (NULL == (line = SLrline_read_line (Calc_RLI, prompt, NULL)))
return SLmake_string ("quit();");
putc ('\n', stdout); fflush (stdout);
SLrline_save_line (Calc_RLI);
return line;
}
static int open_readline (void)
{
if (SLang_init_tty (-1, 0, 1))
{
fprintf(stderr, "Unable to initialize tty.\n");
return -1;
}
SLang_set_abort_signal (NULL);
if (Calc_RLI == NULL)
{
Calc_RLI = SLrline_open (80, SL_RLINE_BLINK_MATCH);
if (Calc_RLI == NULL)
return -1;
}
if (NULL == (Readline_Load_Object = SLallocate_load_type ("<stdin>")))
{
close_readline ();
return -1;
}
Readline_Load_Object->read = read_using_readline;
return 0;
}
static void close_readline (void)
{
if (Readline_Load_Object != NULL)
{
SLdeallocate_load_type (Readline_Load_Object);
Readline_Load_Object = NULL;
}
SLrline_close (Calc_RLI);
Calc_RLI = NULL;
SLang_reset_tty ();
}
static int take_input (void)
{
return SLang_load_object (Readline_Load_Object);
}
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