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#include <HsFFI.h>
#include <stdio.h>
#include <string.h>
#include "hslua.h"
#include "hslcall.h"
/* ***************************************************************
* Transforming Lua errors to Haskell errors
* ***************************************************************/
/*
** arith auxiliary function.
*/
static int auxhslua_arith(lua_State *L)
{
int op = lua_tointeger(L, -1);
lua_pop(L, 1);
lua_arith(L, op);
return 1;
}
/*
** Compares two values on the stack. Behaves mostly like lua_compare,
** but takes an additional parameter `status`, the referent of which is
** assigned the result of calling the helper function.
*/
void hslua_arith(lua_State *L, int op, int *status)
{
int nops = op == LUA_OPUNM ? 1 : 2;
lua_pushcfunction(L, auxhslua_arith);
lua_insert(L, -(nops + 1));
lua_pushinteger(L, op);
int outcome = lua_pcall(L, nops + 1, 1, 0);
if (status != NULL) {
*status = outcome;
}
}
/*
** compare
*/
static int hslua__compare(lua_State *L)
{
int op = lua_tointeger(L, 3);
int res = lua_compare(L, 1, 2, op);
lua_pushinteger(L, res);
return 1;
}
/*
** Compares two values on the stack. Behaves mostly like lua_compare,
** but takes an additional parameter `status`, the referent of which is
** assigned the result of calling the helper function.
*/
int hslua_compare(lua_State *L, int index1, int index2, int op, int *status)
{
index1 = lua_absindex(L, index1);
index2 = lua_absindex(L, index2);
lua_pushcfunction(L, hslua__compare);
lua_pushvalue(L, index1);
lua_pushvalue(L, index2);
lua_pushinteger(L, op);
int outcome = lua_pcall(L, 3, 1, 0);
if (status != NULL) {
*status = outcome;
}
if (outcome != LUA_OK) {
return 0;
}
int result = lua_tointeger(L, -1);
lua_pop(L, 1);
return result;
}
/*
** concat
*/
static int hslua__concat(lua_State *L)
{
lua_concat(L, lua_gettop(L));
return 1;
}
void hslua_concat(lua_State *L, int n, int *status)
{
lua_pushcfunction(L, hslua__concat);
lua_insert(L, -n - 1);
*status = lua_pcall(L, n, 1, 0);
}
/*
** getglobal
*/
static int hslua__getglobal(lua_State *L)
{
lua_gettable(L, 1);
return 1;
}
int hslua_getglobal(lua_State *L, const char *name, size_t len, int *status)
{
lua_pushcfunction(L, hslua__getglobal);
lua_pushglobaltable(L);
lua_pushlstring(L, name, len);
if (status == NULL) {
lua_pcall(L, 2, 1, 0);
} else {
*status = lua_pcall(L, 2, 1, 0);
}
return lua_type(L, -1);
}
/*
** gettable
*/
static int hslua__gettable(lua_State *L)
{
lua_pushvalue(L, 1);
lua_gettable(L, 2);
return 1;
}
int hslua_gettable(lua_State *L, int index, int *status)
{
lua_pushvalue(L, index);
lua_pushcfunction(L, hslua__gettable);
lua_insert(L, -3);
if (status == NULL) {
lua_pcall(L, 2, 1, 0);
} else {
*status = lua_pcall(L, 2, 1, 0);
}
return lua_type(L, -1);
}
/*
** setglobal
*/
static int hslua__setglobal(lua_State *L)
{
/* index 1: value */
/* index 2: the global table */
/* index 3: key */
lua_pushvalue(L, 1);
lua_settable(L, 2);
return 0;
}
void hslua_setglobal(lua_State *L, const char *name, size_t len, int *status)
{
/* we expect the new value to be at the top of the stack */
lua_pushglobaltable(L);
lua_pushlstring(L, name, len);
lua_pushcfunction(L, hslua__setglobal);
lua_insert(L, -4);
if (status == NULL) {
lua_pcall(L, 3, 0, 0);
} else {
*status = lua_pcall(L, 3, 0, 0);
}
}
/*
** settable
*/
static int hslua__settable(lua_State *L)
{
lua_pushvalue(L, 1); /* key */
lua_pushvalue(L, 2); /* value */
lua_settable(L, 3); /* table is the third argument */
return 0;
}
void hslua_settable(lua_State *L, int index, int *status)
{
lua_pushvalue(L, index);
lua_pushcfunction(L, hslua__settable);
lua_insert(L, -4);
*status = lua_pcall(L, 3, 0, 0);
}
/*
** next
*/
static int hslua__next(lua_State *L)
{
lua_pushvalue(L, 1);
return lua_next(L, 2) ? 2 : 0;
}
int hslua_next(lua_State *L, int index, int *status)
{
int oldsize = lua_gettop(L);
lua_pushvalue(L, index);
lua_pushcfunction(L, hslua__next);
lua_insert(L, -3);
*status = lua_pcall(L, 2, LUA_MULTRET, 0);
if (*status != 0) {
/* error */
return 0;
}
/* success */
return (lua_gettop(L) - oldsize + 1); /* correct for popped value */
}
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