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/* Runnr - a library that deals with running Lua scripts.
*/
#include "Runnr.h"
void dumpStack(lua_State *L, int i)
{
int type = lua_type(L, i);
switch (type)
{
case LUA_TNONE : printf("Stack %d is empty\n", i); break;
case LUA_TNIL : printf("Stack %d is a nil\n", i); break;
case LUA_TBOOLEAN : printf("Stack %d is a boolean - %d\n", i, lua_toboolean(L, i)); break;
case LUA_TNUMBER : printf("Stack %d is a number\n - %f", i, lua_tonumber(L, i)); break;
case LUA_TSTRING : printf("Stack %d is a string - %s\n", i, lua_tostring(L, i)); break;
case LUA_TFUNCTION : printf("Stack %d is a function\n", i); break;
case LUA_TTHREAD : printf("Stack %d is a thread\n", i); break;
case LUA_TTABLE :
{
int j;
printf("Stack %d is a table", i);
lua_getfield(L, i, "_NAME");
j = lua_gettop(L);
if (lua_isstring(L, j))
printf(" - %s", lua_tostring(L, j));
lua_pop(L, 1);
printf("\n");
break;
}
case LUA_TUSERDATA : printf("Stack %d is a userdata\n", i); break;
case LUA_TLIGHTUSERDATA : printf("Stack %d is a light userdata\n", i); break;
default : printf("Stack %d is unknown\n", i); break;
}
}
// These are what the various symbols are for each type -
// int %
// num #
// str $
// bool !
// C func &
// table.field @ Expects an integer and a string.
// nil ~
// table {} Starts and stops filling up a new table.
// ( Just syntax sugar for call.
// call ) Expects an integer, the number of results left after the call.
// FIXME: Still to do, if we ever use them -
// stack = Get a value from the stack, expects a stack index.
// userdata +
// lightuserdata *
// thread ^
static char *_push_name(lua_State *L, char *q, int *idx) // Stack usage [-0, +1, e or m]
{
char *p = q;
char temp = '\0';
// A simplistic scan through an identifier, it's wrong, but it's quick,
// and we don't mind that it's wrong, coz this is only internal.
while (isalnum((int)*q))
q++;
temp = *q;
*q = '\0';
if (*idx > 0)
lua_getfield(L, *idx, p); // Stack usage [-0, +1, e]
else
{
if (p != q)
lua_pushstring(L, p); // Stack usage [-0, +1, m]
else
{
lua_pushnumber(L, (lua_Number) (0 - (*idx)));
(*idx)--;
}
}
*q = temp;
return q;
}
int pull_lua(lua_State *L, int i, char *params, ...) // Stack usage -
// if i is a table
// [-n, +n, e]
// else
// [-0, +0, -]
{
va_list vl;
char *f = strdup(params);
char *p = f;
int n = 0, j = i, count = 0;
Eina_Bool table = EINA_FALSE;
if (!f) return -1;
va_start(vl, params);
if (lua_istable(L, i)) // Stack usage [-0, +0, -]
{
j = -1;
table = EINA_TRUE;
}
while (*p)
{
char *q;
Eina_Bool get = EINA_TRUE;
while (isspace((int)*p))
p++;
q = p + 1;
switch (*p)
{
case '%':
{
if (table) q = _push_name(L, q, &i); // Stack usage [-0, +1, e]
if (lua_isnumber(L, j)) // Stack usage [-0, +0, -]
{
int *v = va_arg(vl, int *);
*v = lua_tointeger(L, j); // Stack usage [-0, +0, -]
n++;
}
break;
}
case '#':
{
if (table) q = _push_name(L, q, &i); // Stack usage [-0, +1, e]
if (lua_isnumber(L, j)) // Stack usage [-0, +0, -]
{
double *v = va_arg(vl, double *);
*v = lua_tonumber(L, j); // Stack usage [-0, +0, -]
n++;
}
break;
}
case '$':
{
if (table) q = _push_name(L, q, &i); // Stack usage [-0, +1, e]
if (lua_isstring(L, j)) // Stack usage [-0, +0, -]
{
char **v = va_arg(vl, char **);
size_t len;
char *temp = (char *) lua_tolstring(L, j, &len); // Stack usage [-0, +0, m]
len++; // Cater for the null at the end.
*v = malloc(len);
if (*v)
{
memcpy(*v, temp, len);
n++;
}
}
break;
}
case '!':
{
if (table) q = _push_name(L, q, &i); // Stack usage [-0, +1, e]
if (lua_isboolean(L, j)) // Stack usage [-0, +0, -]
{
int *v = va_arg(vl, int *);
*v = lua_toboolean(L, j); // Stack usage [-0, +0, -]
n++;
}
break;
}
default:
{
get = EINA_FALSE;
break;
}
}
if (get)
{
if (table)
{
// If this is a table, then we pushed a value on the stack, pop it off.
lua_pop(L, 1); // Stack usage [-n, +0, -]
}
else
j++;
count++;
}
p = q;
}
va_end(vl);
free(f);
if (count > n)
n = 0;
else if (table)
n = 1;
return n;
}
int push_lua(lua_State *L, char *params, ...) // Stack usage [-0, +n, em]
{
va_list vl;
char *f = strdup(params);
char *p = f;
int n = 0, table = 0, i = -1;
if (!f) return -1;
va_start(vl, params);
while (*p)
{
char *q;
Eina_Bool set = EINA_TRUE;
while (isspace((int)*p))
p++;
q = p + 1;
switch (*p)
{
case '%':
{
if (table) q = _push_name(L, q, &i); // Stack usage [-0, +1, m]
lua_pushinteger(L, va_arg(vl, int)); // Stack usage [-0, +1, -]
break;
}
case '#':
{
if (table) q = _push_name(L, q, &i); // Stack usage [-0, +1, m]
lua_pushnumber(L, va_arg(vl, double)); // Stack usage [-0, +1, -]
break;
}
case '$':
{
if (table) q = _push_name(L, q, &i); // Stack usage [-0, +1, m]
lua_pushstring(L, va_arg(vl, char *)); // Stack usage [-0, +1, m]
break;
}
case '!':
{
if (table) q = _push_name(L, q, &i); // Stack usage [-0, +1, m]
lua_pushboolean(L, va_arg(vl, int)); // Stack usage [-0, +1, -]
break;
}
case '=':
{
if (table) q = _push_name(L, q, &i); // Stack usage [-0, +1, m]
lua_pushvalue(L, va_arg(vl, int)); // Stack usage [-0, +1, -]
break;
}
case '@':
{
int tabl = va_arg(vl, int);
char *field = va_arg(vl, char *);
if (table) q = _push_name(L, q, &i); // Stack usage [-0, +1, m]
lua_getfield(L, tabl, field); // Stack usage [-0, +1, e]
break;
}
case '&':
{
if (table) q = _push_name(L, q, &i); // Stack usage [-0, +1, m]
lua_pushcfunction(L, va_arg(vl, void *)); // Stack usage [-0, +1, m]
break;
}
case '~':
{
if (table) q = _push_name(L, q, &i); // Stack usage [-0, +1, m]
lua_pushnil(L); // Stack usage [-0, +1, -]
break;
}
case '(': // Just syntax sugar.
{
set = EINA_FALSE;
break;
}
case ')':
{
lua_call(L, n - 1, va_arg(vl, int));
n = 0;
set = EINA_FALSE;
break;
}
case '{':
{
lua_newtable(L);
table++;
n++;
set = EINA_FALSE;
break;
}
case '}':
{
table--;
set = EINA_FALSE;
break;
}
default:
{
set = EINA_FALSE;
break;
}
}
if (set)
{
if (table > 0)
lua_settable(L, -3); // Stack usage [-2, +0, e]
else
n++;
}
p = q;
}
va_end(vl);
free(f);
return n;
}
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