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/*
* LSPIPAT - LUA SPIPAT WRAPPER
* Copyright (C) 2010, Robin Haberkorn
* License: LGPL
*
* CORE: UNARY OPERATORS (ALSO USED AS PRIMITIVES)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdbool.h>
#include <string.h>
#include "lspipat.h"
static void
setcurFncHandler(unsigned pos, void *global __attribute__((unused)), void *local)
{
struct simplefncRefs *simplefnc = local;
lua_State *L = simplefnc->cb.L;
lua_rawgeti(L, LUA_REGISTRYINDEX, simplefnc->cb.function);
lua_pushinteger(L, pos);
lua_rawgeti(L, LUA_REGISTRYINDEX, simplefnc->cb.cookie);
#if 0
lua_rawgeti(L, LUA_REGISTRYINDEX, *(int *)global);
#endif
lua_call(L, 2, 0);
}
/*
* if called as an operator, there will be a nil on top of the stack
*/
LUA_SIG(l_setcur)
{
int top = lua_gettop(L);
PATTERN_WRAPPER *new;
struct simplefncRefs *simplefnc;
luaL_argcheck(L, top == 1 || top == 2, top, L_NUMBER);
luaL_argcheck(L, lua_isfunction(L, 1), 1, L_TYPE);
if (!(new = lua_newuserdata(L, sizeof(PATTERN_WRAPPER))))
L_ERROR(L_ALLOC);
memset(new, 0, sizeof(PATTERN_WRAPPER));
lua_insert(L, 1); /* move wrapper to bottom */
if (top == 1)
lua_pushnil(L); /* cookie will be LUA_REFNIL */
new->type = PATTERN_SIMPLEFNC;
simplefnc = &new->u.simplefnc;
simplefnc->cb.L = L;
simplefnc->cb.cookie = luaL_ref(L, LUA_REGISTRYINDEX);
simplefnc->cb.function = luaL_ref(L, LUA_REGISTRYINDEX);
/* wrapper at top again */
new->pattern = spipat_setcur_fnc(setcurFncHandler, simplefnc);
if (!new->pattern)
L_ERROR(L_ALLOC);
luaL_getmetatable(L, PATTERN_MT);
lua_setmetatable(L, -2);
return 1;
}
static void
predFncHandler(void *global __attribute__((unused)), void *local, struct dynamic *ret)
{
struct retfncRefs *retfnc = local;
lua_State *L = retfnc->cb.L;
lua_rawgeti(L, LUA_REGISTRYINDEX, retfnc->cb.function);
lua_rawgeti(L, LUA_REGISTRYINDEX, retfnc->cb.cookie);
#if 0
lua_rawgeti(L, LUA_REGISTRYINDEX, *(int *)global);
#endif
lua_call(L, 1, 1);
switch (lua_type(L, -1)) {
case LUA_TNUMBER:
case LUA_TSTRING: {
VString *str = &ret->val.str;
ret->type = DY_VSTR;
str->ptr = lua_tolstring(L, -1, (size_t *)&str->len);
str->release = retfncUnrefRet;
str->cookie = retfnc;
/*
* Register value so Lua doesn't free it until spipat
* doesn't need it anymore (value has to be popped now)
*/
retfnc->ret = luaL_ref(L, LUA_REGISTRYINDEX);
return;
}
case LUA_TNIL: /* default behaviour: continue matching (Succeed) */
ret->type = DY_BOOL;
ret->val.pred = true;
lua_pop(L, 1);
return;
case LUA_TBOOLEAN:
ret->type = DY_BOOL;
ret->val.pred = lua_toboolean(L, -1);
lua_pop(L, 1);
return;
case LUA_TUSERDATA: { /* FIXME: check whether it's really a Pattern */
PATTERN_WRAPPER *wrapper = lua_touserdata(L, -1);
if (!wrapper->pattern) {
lua_pop(L, 1);
L_ERROR(L_RETURN);
}
ret->type = DY_PAT;
ret->val.pat.p = wrapper->pattern;
ret->val.pat.release = retfncUnrefRet;
ret->val.pat.cookie = retfnc;
/*
* Register value so Lua doesn't free it until spipat
* doesn't need it anymore (value has to be popped now)
*/
retfnc->ret = luaL_ref(L, LUA_REGISTRYINDEX);
return;
}
default:
lua_pop(L, 1);
L_ERROR(L_RETURN);
}
/* not reached */
}
LUA_SIG(l_pred)
{
int top = lua_gettop(L);
PATTERN_WRAPPER *new;
struct retfncRefs *retfnc;
luaL_argcheck(L, top == 1 || top == 2, top, L_NUMBER);
luaL_argcheck(L, lua_isfunction(L, 1), 1, L_TYPE);
if (!(new = lua_newuserdata(L, sizeof(PATTERN_WRAPPER))))
L_ERROR(L_ALLOC);
memset(new, 0, sizeof(PATTERN_WRAPPER));
lua_insert(L, 1); /* move wrapper to bottom */
if (top == 1)
lua_pushnil(L); /* cookie will be LUA_REFNIL */
new->type = PATTERN_RETFNC;
retfnc = &new->u.retfnc;
retfnc->cb.L = L;
retfnc->cb.cookie = luaL_ref(L, LUA_REGISTRYINDEX);
retfnc->cb.function = luaL_ref(L, LUA_REGISTRYINDEX);
/* wrapper at top again */
new->pattern = spipat_dynamic_fnc(predFncHandler, retfnc);
if (!new->pattern)
L_ERROR(L_ALLOC);
luaL_getmetatable(L, PATTERN_MT);
lua_setmetatable(L, -2);
return 1;
}
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