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/*

** $Id: ldblib.c,v 1.131 2011/10/24 14:54:05 roberto Exp $

** Interface from Lua to its debug API

** See Copyright Notice in lua.h

*/

#include 

#include 

#include 

#define ldblib_c

#define LUA_LIB

#include "lua.h"

#include "lauxlib.h"

#include "lualib.h"

#define HOOKKEY		"_HKEY"

static int db_getregistry (lua_State *L) {

  lua_pushvalue(L, LUA_REGISTRYINDEX);

  return 1;

}

static int db_getmetatable (lua_State *L) {

  luaL_checkany(L, 1);

  if (!lua_getmetatable(L, 1)) {

    lua_pushnil(L);  /* no metatable */

  }

  return 1;

}

static int db_setmetatable (lua_State *L) {

  int t = lua_type(L, 2);

  luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,

                    "nil or table expected");

  lua_settop(L, 2);

  lua_setmetatable(L, 1);

  return 1;  /* return 1st argument */

}

static int db_getuservalue (lua_State *L) {

  if (lua_type(L, 1) != LUA_TUSERDATA)

    lua_pushnil(L);

  else

    lua_getuservalue(L, 1);

  return 1;

}

static int db_setuservalue (lua_State *L) {

  if (lua_type(L, 1) == LUA_TLIGHTUSERDATA)

    luaL_argerror(L, 1, "full userdata expected, got light userdata");

  luaL_checktype(L, 1, LUA_TUSERDATA);

  if (!lua_isnoneornil(L, 2))

    luaL_checktype(L, 2, LUA_TTABLE);

  lua_settop(L, 2);

  lua_setuservalue(L, 1);

  return 1;

}

static void settabss (lua_State *L, const char *i, const char *v) {

  lua_pushstring(L, v);

  lua_setfield(L, -2, i);

}

static void settabsi (lua_State *L, const char *i, int v) {

  lua_pushinteger(L, v);

  lua_setfield(L, -2, i);

}

static void settabsb (lua_State *L, const char *i, int v) {

  lua_pushboolean(L, v);

  lua_setfield(L, -2, i);

}

static lua_State *getthread (lua_State *L, int *arg) {

  if (lua_isthread(L, 1)) {

    *arg = 1;

    return lua_tothread(L, 1);

  }

  else {

    *arg = 0;

    return L;

  }

}

static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) {

  if (L == L1) {

    lua_pushvalue(L, -2);

    lua_remove(L, -3);

  }

  else

    lua_xmove(L1, L, 1);

  lua_setfield(L, -2, fname);

}

static int db_getinfo (lua_State *L) {

  lua_Debug ar;

  int arg;

  lua_State *L1 = getthread(L, &arg);

  const char *options = luaL_optstring(L, arg+2, "flnStu");

  if (lua_isnumber(L, arg+1)) {

    if (!lua_getstack(L1, (int)lua_tointeger(L, arg+1), &ar)) {

      lua_pushnil(L);  /* level out of range */

      return 1;

    }

  }

  else if (lua_isfunction(L, arg+1)) {

    lua_pushfstring(L, ">%s", options);

    options = lua_tostring(L, -1);

    lua_pushvalue(L, arg+1);

    lua_xmove(L, L1, 1);

  }

  else

    return luaL_argerror(L, arg+1, "function or level expected");

  if (!lua_getinfo(L1, options, &ar))

    return luaL_argerror(L, arg+2, "invalid option");

  lua_createtable(L, 0, 2);

  if (strchr(options, 'S')) {

    settabss(L, "source", ar.source);

    settabss(L, "short_src", ar.short_src);

    settabsi(L, "linedefined", ar.linedefined);

    settabsi(L, "lastlinedefined", ar.lastlinedefined);

    settabss(L, "what", ar.what);

  }

  if (strchr(options, 'l'))

    settabsi(L, "currentline", ar.currentline);

  if (strchr(options, 'u')) {

    settabsi(L, "nups", ar.nups);

    settabsi(L, "nparams", ar.nparams);

    settabsb(L, "isvararg", ar.isvararg);

  }

  if (strchr(options, 'n')) {

    settabss(L, "name", ar.name);

    settabss(L, "namewhat", ar.namewhat);

  }

  if (strchr(options, 't'))

    settabsb(L, "istailcall", ar.istailcall);

  if (strchr(options, 'L'))

    treatstackoption(L, L1, "activelines");

  if (strchr(options, 'f'))

    treatstackoption(L, L1, "func");

  return 1;  /* return table */

}

static int db_getlocal (lua_State *L) {

  int arg;

  lua_State *L1 = getthread(L, &arg);

  lua_Debug ar;

  const char *name;

  int nvar = luaL_checkint(L, arg+2);  /* local-variable index */

  if (lua_isfunction(L, arg + 1)) {  /* function argument? */

    lua_pushvalue(L, arg + 1);  /* push function */

    lua_pushstring(L, lua_getlocal(L, NULL, nvar));  /* push local name */

    return 1;

  }

  else {  /* stack-level argument */

    if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar))  /* out of range? */

      return luaL_argerror(L, arg+1, "level out of range");

    name = lua_getlocal(L1, &ar, nvar);

    if (name) {

      lua_xmove(L1, L, 1);  /* push local value */

      lua_pushstring(L, name);  /* push name */

      lua_pushvalue(L, -2);  /* re-order */

      return 2;

    }

    else {

      lua_pushnil(L);  /* no name (nor value) */

      return 1;

    }

  }

}

static int db_setlocal (lua_State *L) {

  int arg;

  lua_State *L1 = getthread(L, &arg);

  lua_Debug ar;

  if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar))  /* out of range? */

    return luaL_argerror(L, arg+1, "level out of range");

  luaL_checkany(L, arg+3);

  lua_settop(L, arg+3);

  lua_xmove(L, L1, 1);

  lua_pushstring(L, lua_setlocal(L1, &ar, luaL_checkint(L, arg+2)));

  return 1;

}

static int auxupvalue (lua_State *L, int get) {

  const char *name;

  int n = luaL_checkint(L, 2);

  luaL_checktype(L, 1, LUA_TFUNCTION);

  name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n);

  if (name == NULL) return 0;

  lua_pushstring(L, name);

  lua_insert(L, -(get+1));

  return get + 1;

}

static int db_getupvalue (lua_State *L) {

  return auxupvalue(L, 1);

}

static int db_setupvalue (lua_State *L) {

  luaL_checkany(L, 3);

  return auxupvalue(L, 0);

}

static int checkupval (lua_State *L, int argf, int argnup) {

  lua_Debug ar;

  int nup = luaL_checkint(L, argnup);

  luaL_checktype(L, argf, LUA_TFUNCTION);

  lua_pushvalue(L, argf);

  lua_getinfo(L, ">u", &ar);

  luaL_argcheck(L, 1 <= nup && nup <= ar.nups, argnup, "invalid upvalue index");

  return nup;

}

static int db_upvalueid (lua_State *L) {

  int n = checkupval(L, 1, 2);

  lua_pushlightuserdata(L, lua_upvalueid(L, 1, n));

  return 1;

}

static int db_upvaluejoin (lua_State *L) {

  int n1 = checkupval(L, 1, 2);

  int n2 = checkupval(L, 3, 4);

  luaL_argcheck(L, !lua_iscfunction(L, 1), 1, "Lua function expected");

  luaL_argcheck(L, !lua_iscfunction(L, 3), 3, "Lua function expected");

  lua_upvaluejoin(L, 1, n1, 3, n2);

  return 0;

}

#define gethooktable(L)	luaL_getsubtable(L, LUA_REGISTRYINDEX, HOOKKEY);

static void hookf (lua_State *L, lua_Debug *ar) {

  static const char *const hooknames[] =

    {"call", "return", "line", "count", "tail call"};

  gethooktable(L);

  lua_rawgetp(L, -1, L);

  if (lua_isfunction(L, -1)) {

    lua_pushstring(L, hooknames[(int)ar->event]);

    if (ar->currentline >= 0)

      lua_pushinteger(L, ar->currentline);

    else lua_pushnil(L);

    lua_assert(lua_getinfo(L, "lS", ar));

    lua_call(L, 2, 0);

  }

}

static int makemask (const char *smask, int count) {

  int mask = 0;

  if (strchr(smask, 'c')) mask |= LUA_MASKCALL;

  if (strchr(smask, 'r')) mask |= LUA_MASKRET;

  if (strchr(smask, 'l')) mask |= LUA_MASKLINE;

  if (count > 0) mask |= LUA_MASKCOUNT;

  return mask;

}

static char *unmakemask (int mask, char *smask) {

  int i = 0;

  if (mask & LUA_MASKCALL) smask[i++] = 'c';

  if (mask & LUA_MASKRET) smask[i++] = 'r';

  if (mask & LUA_MASKLINE) smask[i++] = 'l';

  smask[i] = '\0';

  return smask;

}

static int db_sethook (lua_State *L) {

  int arg, mask, count;

  lua_Hook func;

  lua_State *L1 = getthread(L, &arg);

  if (lua_isnoneornil(L, arg+1)) {

    lua_settop(L, arg+1);

    func = NULL; mask = 0; count = 0;  /* turn off hooks */

  }

  else {

    const char *smask = luaL_checkstring(L, arg+2);

    luaL_checktype(L, arg+1, LUA_TFUNCTION);

    count = luaL_optint(L, arg+3, 0);

    func = hookf; mask = makemask(smask, count);

  }

  gethooktable(L);

  lua_pushvalue(L, arg+1);

  lua_rawsetp(L, -2, L1);  /* set new hook */

  lua_pop(L, 1);  /* remove hook table */

  lua_sethook(L1, func, mask, count);  /* set hooks */

  return 0;

}

static int db_gethook (lua_State *L) {

  int arg;

  lua_State *L1 = getthread(L, &arg);

  char buff[5];

  int mask = lua_gethookmask(L1);

  lua_Hook hook = lua_gethook(L1);

  if (hook != NULL && hook != hookf)  /* external hook? */

    lua_pushliteral(L, "external hook");

  else {

    gethooktable(L);

    lua_rawgetp(L, -1, L1);   /* get hook */

    lua_remove(L, -2);  /* remove hook table */

  }

  lua_pushstring(L, unmakemask(mask, buff));

  lua_pushinteger(L, lua_gethookcount(L1));

  return 3;

}

static int db_debug (lua_State *L) {

  for (;;) {

    char buffer[250];

    luai_writestringerror("%s", "lua_debug> ");

    if (fgets(buffer, sizeof(buffer), stdin) == 0 ||

        strcmp(buffer, "cont\n") == 0)

      return 0;

    if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") ||

        lua_pcall(L, 0, 0, 0))

      luai_writestringerror("%s\n", lua_tostring(L, -1));

    lua_settop(L, 0);  /* remove eventual returns */

  }

}

static int db_traceback (lua_State *L) {

  int arg;

  lua_State *L1 = getthread(L, &arg);

  const char *msg = lua_tostring(L, arg + 1);

  if (msg == NULL && !lua_isnoneornil(L, arg + 1))  /* non-string 'msg'? */

    lua_pushvalue(L, arg + 1);  /* return it untouched */

  else {

    int level = luaL_optint(L, arg + 2, (L == L1) ? 1 : 0);

    luaL_traceback(L, L1, msg, level);

  }

  return 1;

}

static const luaL_Reg dblib[] = {

  {"debug", db_debug},

  {"getuservalue", db_getuservalue},

  {"gethook", db_gethook},

  {"getinfo", db_getinfo},

  {"getlocal", db_getlocal},

  {"getregistry", db_getregistry},

  {"getmetatable", db_getmetatable},

  {"getupvalue", db_getupvalue},

  {"upvaluejoin", db_upvaluejoin},

  {"upvalueid", db_upvalueid},

  {"setuservalue", db_setuservalue},

  {"sethook", db_sethook},

  {"setlocal", db_setlocal},

  {"setmetatable", db_setmetatable},

  {"setupvalue", db_setupvalue},

  {"traceback", db_traceback},

  {NULL, NULL}

};

LUAMOD_API int luaopen_debug (lua_State *L) {

  luaL_newlib(L, dblib);

  return 1;

}