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l-crawl.cc
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/**
* @file
* @brief General game bindings.
**/
/*
--- General game bindings
module "crawl"
*/
#include "AppHdr.h"
#include "l-libs.h"
#include "chardump.h"
#include "cluautil.h"
#include "command.h"
#include "delay.h"
#include "dlua.h"
#include "end.h"
#include "english.h"
#include "fight.h"
#include "hints.h"
#include "initfile.h"
#include "item-name.h"
#include "libutil.h"
#include "macro.h"
#include "menu.h"
#include "message.h"
#include "notes.h"
#include "output.h"
#include "perlin.h"
#include "prompt.h"
#include "religion.h"
#include "sound.h"
#include "state.h"
#include "state.h"
#include "stringutil.h"
#include "tutorial.h"
#include "unwind.h"
#include "version.h"
#include "view.h"
#include "worley.h"
#ifdef TARGET_OS_WINDOWS
# include "windows.h"
#else
# include <sys/time.h>
# include <time.h>
#endif
/////////////////////////////////////////////////////////////////////
// User accessible
//
/*
--- Print a message.
-- @param message message to print
-- @channel channel to print on; defaults to 0 (<code>MSGCH_PLAIN</code>)
function mpr(message, channel) */
static int crawl_mpr(lua_State *ls)
{
if (!crawl_state.io_inited)
return 0;
const char *message = luaL_checkstring(ls, 1);
if (!message)
return 0;
int ch = MSGCH_PLAIN;
if (lua_isnumber(ls, 2))
ch = luaL_checkint(ls, 2);
else
{
const char *channel = lua_tostring(ls, 2);
if (channel)
ch = str_to_channel(channel);
}
if (ch < 0 || ch >= NUM_MESSAGE_CHANNELS)
ch = MSGCH_PLAIN;
mprf(static_cast<msg_channel_type>(ch), "%s", message);
return 0;
}
/*
---
function formatted_mpr(message, channel) */
static int crawl_formatted_mpr(lua_State *ls)
{
if (!crawl_state.io_inited)
return 0;
const char *message = luaL_checkstring(ls, 1);
if (!message)
return 0;
int ch = MSGCH_PLAIN;
if (lua_isnumber(ls, 2))
ch = luaL_checkint(ls, 2);
else
{
const char *channel = lua_tostring(ls, 2);
if (channel)
ch = str_to_channel(channel);
}
if (ch < 0 || ch >= NUM_MESSAGE_CHANNELS)
ch = MSGCH_PLAIN;
formatted_mpr(formatted_string::parse_string(message),
static_cast<msg_channel_type>(ch));
return 0;
}
/*
--- Print to stderr for debugging hooks.
function stderr(text) */
LUAFN(crawl_stderr)
{
const char *text = luaL_checkstring(ls, 1);
fprintf(stderr, "%s\n", text);
return 0;
}
/*
--- Debugging spew.
function dpr(text) */
LUAFN(crawl_dpr)
{
#ifdef DEBUG_DIAGNOSTICS
const char *text = luaL_checkstring(ls, 1);
if (crawl_state.io_inited)
dprf("%s", text);
#endif
return 0;
}
/*
---
function delay(ms) */
LUAWRAP(crawl_delay, delay(luaL_checkint(ls, 1)))
/*
---
function more() */
LUAWRAP(crawl_more, more())
/*
---
function flush_prev_message() */
LUAWRAP(crawl_flush_prev_message, flush_prev_message())
/*
---
function clear_messages(force) */
LUAWRAP(crawl_clear_messages,
clear_messages(lua_isboolean(ls, 1) ? lua_toboolean(ls, 1) : false))
/*
---
function redraw_screen() */
LUAWRAP(crawl_redraw_screen, redraw_screen())
/*
---
function set_more_autoclear(flag) */
static int crawl_set_more_autoclear(lua_State *ls)
{
if (lua_isnone(ls, 1))
{
luaL_argerror(ls, 1, "needs a boolean argument");
return 0;
}
set_more_autoclear(lua_toboolean(ls, 1));
return 0;
}
/*
---
function enable_more(flag) */
static int crawl_enable_more(lua_State *ls)
{
if (lua_isnone(ls, 1))
{
luaL_argerror(ls, 1, "needs a boolean argument");
return 0;
}
crawl_state.show_more_prompt = lua_toboolean(ls, 1);
return 0;
}
/*
--- Wrapper for <code>cancellable_get_line()</code>. Since that takes
-- a pre-allocated buffer, an arbitrary 500-character limit is
-- currently imposed.
-- @return Either a string if one is input, or nil if input is cancelled
function c_input_line() */
static int crawl_c_input_line(lua_State *ls)
{
char linebuf[500];
bool valid = !cancellable_get_line(linebuf, sizeof linebuf);
if (valid)
lua_pushstring(ls, linebuf);
else
lua_pushnil(ls);
return 1;
}
/*
--- Get input key (combo).
-- @return integer representing the key (combo) input
function getch() */
LUARET1(crawl_getch, number, getchm())
/*
--- Check for pending input.
-- @return 1 if there is, 0 otherwise
function kbhit() */
LUARET1(crawl_kbhit, number, kbhit())
/*
--- Flush the input buffer (typeahead).
function flush_input() */
LUAWRAP(crawl_flush_input, flush_input_buffer(FLUSH_LUA))
static char _lua_char(lua_State *ls, int ndx, char defval = 0)
{
return lua_isnone(ls, ndx) || !lua_isstring(ls, ndx)? defval
: lua_tostring(ls, ndx)[0];
}
/*
--- Ask the player a yes/no question.
-- The player is supposed to answer by pressing Y or N.
-- @param prompt question for the user
-- @param safe accept lowercase answers?
-- @param safeanswer if a letter, this will be considered a safe default
-- @param clear_after clear the question after the user answers?
-- @param noprompt if true, skip asking the question; just wait for the answer
function yesno(prompt, safe, safeanswer, clear_after, interrupt_delays, noprompt) */
static int crawl_yesno(lua_State *ls)
{
const char *prompt = luaL_checkstring(ls, 1);
const bool safe = lua_toboolean(ls, 2);
const int safeanswer = _lua_char(ls, 3);
const bool clear_after =
lua_isnone(ls, 4) ? true : lua_toboolean(ls, 4);
const bool interrupt_delays =
lua_isnone(ls, 5) ? true : lua_toboolean(ls, 5);
const bool noprompt =
lua_isnone(ls, 6) ? false : lua_toboolean(ls, 6);
lua_pushboolean(ls, yesno(prompt, safe, safeanswer, clear_after,
interrupt_delays, noprompt));
return 1;
}
/*
--- Ask the player a yes/no/quit question.
-- Mostly like <code>yesno()</code>, but doesn't yet support as many
-- parameters in this Lua binding.
-- @param allow_all actually ask a yes/no/quit/all question
function yesnoquit(prompt, safe, safeanswer, allow_all, clear_after) */
static int crawl_yesnoquit(lua_State *ls)
{
const char *prompt = luaL_checkstring(ls, 1);
const bool safe = lua_toboolean(ls, 2);
const int safeanswer = _lua_char(ls, 3);
const bool allow_all =
lua_isnone(ls, 4) ? false : lua_toboolean(ls, 4);
const bool clear_after =
lua_isnone(ls, 5) ? true : lua_toboolean(ls, 5);
// Skipping the other params until somebody needs them.
lua_pushnumber(ls, yesnoquit(prompt, safe, safeanswer, allow_all,
clear_after));
return 1;
}
static void crawl_sendkeys_proc(lua_State *ls, int argi)
{
if (lua_isstring(ls, argi))
{
const char *keys = luaL_checkstring(ls, argi);
if (!keys)
return;
char32_t wc;
while (int len = utf8towc(&wc, keys))
{
macro_sendkeys_end_add_expanded(wc);
keys += len;
}
}
else if (lua_istable(ls, argi))
{
for (int i = 1; ; ++i)
{
lua_rawgeti(ls, argi, i);
if (lua_isnil(ls, -1))
{
lua_pop(ls, 1);
return;
}
crawl_sendkeys_proc(ls, lua_gettop(ls));
lua_pop(ls, 1);
}
}
else if (lua_isnumber(ls, argi))
macro_sendkeys_end_add_expanded(luaL_checkint(ls, argi));
}
/*
--- XXX vararg function
--
function sendkeys() */
static int crawl_sendkeys(lua_State *ls)
{
int top = lua_gettop(ls);
for (int i = 1; i <= top; ++i)
crawl_sendkeys_proc(ls, i);
return 0;
}
/*
--- Tell Crawl to process one command.
-- @return whether it will actually do so?
function process_command() */
static int crawl_process_command(lua_State *ls)
{
const bool will_process =
!you_are_delayed() || current_delay()->is_macro();
if (will_process)
{
// This should only be called from a macro delay, but run_macro
// may not have started the macro delay; do so now.
if (!you_are_delayed())
start_delay<MacroDelay>();
start_delay<MacroProcessKeyDelay>();
}
lua_pushboolean(ls, will_process);
return 1;
}
static bool _check_can_do_command(lua_State *ls)
{
auto delay = current_delay();
if (delay && !delay->is_macro())
{
luaL_error(ls, "Cannot currently process new keys (%s delay active)",
delay->name());
return false;
}
if (you.turn_is_over)
{
luaL_error(ls, "Cannot currently process new keys (turn is over)");
return false;
}
return true;
}
/*
---
function process_keys() */
static int crawl_process_keys(lua_State *ls)
{
if (!_check_can_do_command(ls))
return 0;
// if there's pending input, pushing to the end of the buffer may separate
// the first element of the sequence from the rest. TODO: should this be
// changed to push the key sequence to the beginning of the buffer? See
// crawl_do_commands below.
if (has_pending_input())
{
luaL_error(ls,
"Cannot currently process new keys (there is pending input)");
return 0;
}
const char* keys = luaL_checkstring(ls, 1);
if (strlen(keys) == 0)
{
luaL_argerror(ls, 1, "Must have at least one key to process.");
return 0;
}
command_type cmd = key_to_command(keys[0], KMC_DEFAULT);
if (cmd == CMD_NO_CMD)
{
luaL_argerror(ls, 1, "First key is invalid command");
return 0;
}
unwind_bool gen(crawl_state.invisible_targeting,
lua_isboolean(ls, 2) && lua_toboolean(ls, 2));
flush_input_buffer(FLUSH_BEFORE_COMMAND);
for (int i = 1, len = strlen(keys); i < len; i++)
macro_sendkeys_end_add_expanded(keys[i]);
process_command_on_record(cmd);
return 0;
}
static int crawl_set_sendkeys_errors(lua_State *ls)
{
// enable or disable crashing on flushing an incomplete sendkeys buffer.
// used for tests, not generally useful in real life. Crashing only happens
// in wizmode.
const bool errors = lua_toboolean(ls, 1);
crawl_state.nonempty_buffer_flush_errors = errors;
return 0;
}
static int crawl_do_commands(lua_State *ls)
{
if (!_check_can_do_command(ls))
return 0;
unwind_bool gen(crawl_state.invisible_targeting,
lua_isboolean(ls, 2) && lua_toboolean(ls, 2));
if (lua_isboolean(ls, 2))
lua_pop(ls, 1);
if (!lua_istable(ls, 1))
{
luaL_argerror(ls, 1, "Must be an array");
return 0;
}
vector<string> commands;
lua_pushnil(ls);
while (lua_next(ls, 1))
{
if (!lua_isstring(ls, -1))
{
luaL_argerror(ls, 1, "Table contains non-string");
return 0;
}
commands.push_back(lua_tostring(ls, -1));
lua_pop(ls, 1);
}
bool first = true;
command_type firstcmd = CMD_NO_CMD;
deque<command_type> cmd_seq;
for (const auto& command : commands)
{
command_type cmd = name_to_command(command);
if (cmd == CMD_NO_CMD)
{
luaL_argerror(ls, 1, ("Invalid command: " + command).c_str());
return 0;
}
if (first)
{
firstcmd = cmd;
first = false;
}
else
cmd_seq.push_front(cmd); // reverse order for adding below
}
flush_input_buffer(FLUSH_BEFORE_COMMAND);
// insert commands to the front of the macro buffer so that they are
// guaranteed to be processed adjacent to firstcmd
for (auto c : cmd_seq)
macro_buf_add_cmd(c, true);
process_command_on_record(firstcmd);
return 0;
}
#ifdef USE_SOUND
/*
--- Play a sound.
-- @param sf filename of sound to play
function playsound(sf) */
static int crawl_playsound(lua_State *ls)
{
const char *sf = luaL_checkstring(ls, 1);
if (!sf)
return 0;
play_sound(sf);
return 0;
}
#endif
/*
--- Run a macro.
-- @param macroname name of macro to run
function runmacro(macroname) */
static int crawl_runmacro(lua_State *ls)
{
const char *macroname = luaL_checkstring(ls, 1);
if (!macroname)
return 0;
run_macro(macroname);
return 0;
}
/*
--- Set user options from string.
-- @param s string of options to set, in same format as <tt>init.txt</tt>/<tt>.crawlrc</tt>.
function setopt(s) */
static int crawl_setopt(lua_State *ls)
{
if (!lua_isstring(ls, 1))
return 0;
const char *s = lua_tostring(ls, 1);
if (s)
{
// Note that the conditional script can contain nested Lua[ ]Lua code.
read_options(s, true);
}
return 0;
}
/*
--- Read options from file.
-- @param filename name of file to read from
function read_options(filename) */
static int crawl_read_options(lua_State *ls)
{
if (!lua_isstring(ls, 1))
return 0;
const char* filename = lua_tostring(ls, 1);
Options.include(filename, true, true);
return 0;
}
static int crawl_bindkey(lua_State *ls)
{
const char *s = nullptr;
if (lua_isstring(ls, 1))
s = lua_tostring(ls, 1);
if (!s || !lua_isfunction(ls, 2) || lua_gettop(ls) != 2)
return 0;
lua_pushvalue(ls, 2);
string name = clua.setuniqregistry();
if (lua_gettop(ls) != 2)
{
fprintf(stderr, "Stack top has changed!\n");
lua_settop(ls, 2);
}
macro_userfn(s, name.c_str());
return 0;
}
static int crawl_msgch_num(lua_State *ls)
{
const char *s = luaL_checkstring(ls, 1);
if (!s)
return 0;
int ch = str_to_channel(s);
if (ch == -1)
return 0;
lua_pushnumber(ls, ch);
return 1;
}
static int crawl_msgch_name(lua_State *ls)
{
int num = luaL_checkint(ls, 1);
string name = channel_to_str(num);
lua_pushstring(ls, name.c_str());
return 1;
}
static int crawl_take_note(lua_State *ls)
{
const char* msg = luaL_checkstring(ls, 1);
take_note(Note(NOTE_MESSAGE, 0, 0, msg));
return 0;
}
static int crawl_messages(lua_State *ls)
{
const int count = luaL_checkint(ls, 1);
lua_pushstring(ls, get_last_messages(count).c_str());
return 1;
}
#define REGEX_METATABLE "crawl.regex"
#define MESSF_METATABLE "crawl.messf"
static int crawl_regex(lua_State *ls)
{
const char *s = luaL_checkstring(ls, 1);
if (!s)
return 0;
text_pattern **tpudata =
clua_new_userdata< text_pattern* >(ls, REGEX_METATABLE);
if (tpudata)
{
*tpudata = new text_pattern(s);
return 1;
}
return 0;
}
static int crawl_regex_find(lua_State *ls)
{
text_pattern **pattern =
clua_get_userdata< text_pattern* >(ls, REGEX_METATABLE);
if (!pattern)
return 0;
const char *text = luaL_checkstring(ls, -1);
if (!text)
return 0;
lua_pushboolean(ls, (*pattern)->matches(text));
return 1;
}
static int crawl_regex_equals(lua_State *ls)
{
text_pattern **pattern =
clua_get_userdata< text_pattern* >(ls, REGEX_METATABLE);
text_pattern **arg =
clua_get_userdata< text_pattern* >(ls, REGEX_METATABLE, 2);
lua_pushboolean(ls, pattern && arg && **pattern == **arg);
return 1;
}
static const luaL_reg crawl_regex_ops[] =
{
{ "matches", crawl_regex_find },
{ "equals", crawl_regex_equals },
{ nullptr, nullptr }
};
static int crawl_message_filter(lua_State *ls)
{
const char *pattern = luaL_checkstring(ls, 1);
if (!pattern)
return 0;
int num = lua_isnumber(ls, 2)? luaL_checkint(ls, 2) : -1;
message_filter **mf =
clua_new_userdata< message_filter* >(ls, MESSF_METATABLE);
if (mf)
{
*mf = new message_filter(num, pattern);
return 1;
}
return 0;
}
static int crawl_messf_matches(lua_State *ls)
{
message_filter **mf =
clua_get_userdata< message_filter* >(ls, MESSF_METATABLE);
if (!mf)
return 0;
const char *pattern = luaL_checkstring(ls, 2);
int ch = luaL_checkint(ls, 3);
if (pattern)
{
bool filt = (*mf)->is_filtered(ch, pattern);
lua_pushboolean(ls, filt);
return 1;
}
return 0;
}
static int crawl_messf_equals(lua_State *ls)
{
message_filter **mf =
clua_get_userdata< message_filter* >(ls, MESSF_METATABLE);
message_filter **arg =
clua_get_userdata< message_filter* >(ls, MESSF_METATABLE, 2);
lua_pushboolean(ls, mf && arg && **mf == **arg);
return 1;
}
static const luaL_reg crawl_messf_ops[] =
{
{ "matches", crawl_messf_matches },
{ "equals", crawl_messf_equals },
{ nullptr, nullptr }
};
static int crawl_trim(lua_State *ls)
{
const char *s = luaL_checkstring(ls, 1);
if (!s)
return 0;
string text = s;
trim_string(text);
lua_pushstring(ls, text.c_str());
return 1;
}
static int crawl_split(lua_State *ls)
{
const char *s = luaL_checkstring(ls, 1),
*token = luaL_checkstring(ls, 2);
if (!s || !token)
return 0;
vector<string> segs = split_string(token, s);
if (lua_isboolean(ls, 3) && lua_toboolean(ls, 3))
reverse(segs.begin(), segs.end());
lua_newtable(ls);
for (int i = 0, count = segs.size(); i < count; ++i)
{
lua_pushstring(ls, segs[i].c_str());
lua_rawseti(ls, -2, i + 1);
}
return 1;
}
static int _crawl_grammar(lua_State *ls)
{
description_level_type ndesc = DESC_PLAIN;
if (lua_isstring(ls, 2))
ndesc = description_type_by_name(lua_tostring(ls, 2));
PLUARET(string,
thing_do_grammar(ndesc, false,
false, luaL_checkstring(ls, 1)).c_str());
}
static int crawl_article_a(lua_State *ls)
{
const char *s = luaL_checkstring(ls, 1);
bool lowercase = true;
if (lua_isboolean(ls, 2))
lowercase = lua_toboolean(ls, 2);
lua_pushstring(ls, article_a(s, lowercase).c_str());
return 1;
}
LUARET1(crawl_game_started, boolean, crawl_state.need_save
|| crawl_state.map_stat_gen
|| crawl_state.obj_stat_gen
|| crawl_state.test)
LUARET1(crawl_stat_gain_prompt, boolean, crawl_state.stat_gain_prompt)
LUARET1(crawl_random2, number, random2(luaL_checkint(ls, 1)))
LUARET1(crawl_one_chance_in, boolean, one_chance_in(luaL_checkint(ls, 1)))
LUARET1(crawl_random2avg, number,
random2avg(luaL_checkint(ls, 1), luaL_checkint(ls, 2)))
LUARET1(crawl_random_range, number,
random_range(luaL_checkint(ls, 1), luaL_checkint(ls, 2),
lua_isnumber(ls, 3)? luaL_checkint(ls, 3) : 1))
LUARET1(crawl_coinflip, boolean, coinflip())
LUARET1(crawl_roll_dice, number,
lua_gettop(ls) == 1
? roll_dice(1, luaL_checkint(ls, 1))
: roll_dice(luaL_checkint(ls, 1), luaL_checkint(ls, 2)))
LUARET1(crawl_x_chance_in_y, boolean, x_chance_in_y(luaL_checkint(ls, 1),
luaL_checkint(ls, 2)))
LUARET1(crawl_div_rand_round, number, div_rand_round(luaL_checkint(ls, 1),
luaL_checkint(ls, 2)))
LUARET1(crawl_random_real, number, random_real())
LUARET1(crawl_weapon_check, boolean, wielded_weapon_check(you.weapon()))
// Get the full worley noise datum for a given point
static int crawl_worley(lua_State *ls)
{
double px = lua_tonumber(ls,1);
double py = lua_tonumber(ls,2);
double pz = lua_tonumber(ls,3);
worley::noise_datum n = worley::noise(px,py,pz);
lua_pushnumber(ls, n.distance[0]);
lua_pushnumber(ls, n.distance[1]);
lua_pushnumber(ls, n.id[0]);
lua_pushnumber(ls, n.id[1]);
lua_pushnumber(ls, n.pos[0][0]);
lua_pushnumber(ls, n.pos[0][1]);
lua_pushnumber(ls, n.pos[0][2]);
lua_pushnumber(ls, n.pos[1][0]);
lua_pushnumber(ls, n.pos[1][1]);
lua_pushnumber(ls, n.pos[1][2]);
return 10;
}
// Simpler return value for normal situations where we just
// want the difference between the nearest point distances.
// Also returns the id in case we want a per-node number.
static int crawl_worley_diff(lua_State *ls)
{
double px = lua_tonumber(ls,1);
double py = lua_tonumber(ls,2);
double pz = lua_tonumber(ls,3);
worley::noise_datum n = worley::noise(px,py,pz);
lua_pushnumber(ls, n.distance[1]-n.distance[0]);
lua_pushnumber(ls, n.id[0]);
return 2;
}
// Splits a 32-bit integer into four bytes. This is useful
// in conjunction with worley ids to get four random numbers
// instead of one from the current node id.
static int crawl_split_bytes(lua_State *ls)
{
uint32_t val = lua_tonumber(ls,1);
uint8_t bytes[4] =
{
(uint8_t)(val >> 24),
(uint8_t)(val >> 16),
(uint8_t)(val >> 8),
(uint8_t)(val)
};
lua_pushnumber(ls, bytes[0]);
lua_pushnumber(ls, bytes[1]);
lua_pushnumber(ls, bytes[2]);
lua_pushnumber(ls, bytes[3]);
return 4;
}
// Supports 2D-4D Simplex noise. The first two parameters are required
// for 2D noise, the next two are optional for 3D or 4D.
// TODO: Could support octaves here but maybe it can be handled more
// flexibly in lua
static int crawl_simplex(lua_State *ls)
{
int dims = 0;
double vals[4];
if (lua_isnumber(ls,1))
{
vals[dims] = lua_tonumber(ls,1);
dims++;
}
if (lua_isnumber(ls,2))
{
vals[dims] = lua_tonumber(ls,2);
dims++;
}
if (lua_isnumber(ls,3))
{
vals[dims] = lua_tonumber(ls,3);
dims++;
}
if (lua_isnumber(ls,4))
{
vals[dims] = lua_tonumber(ls,4);
dims++;
}
double result;
switch (dims)
{
case 2:
result = perlin::noise(vals[0],vals[1]);
break;
case 3:
result = perlin::noise(vals[0],vals[1],vals[2]);
break;
case 4:
result = perlin::noise(vals[0],vals[1],vals[2],vals[3]);
break;
default:
return 0; // TODO: Throw error?
}
lua_pushnumber(ls, result);
return 1;
}
static int crawl_is_tiles(lua_State *ls)
{
lua_pushboolean(ls, is_tiles());
return 1;
}
static int crawl_is_webtiles(lua_State *ls)
{
#ifdef USE_TILE_WEB
lua_pushboolean(ls, true);
#else
lua_pushboolean(ls, false);
#endif
return 1;
}
static int crawl_is_touch_ui(lua_State *ls)
{
#ifdef TOUCH_UI
lua_pushboolean(ls, true);
#else
lua_pushboolean(ls, false);
#endif
return 1;
}
static int crawl_get_command(lua_State *ls)
{
if (lua_gettop(ls) == 0)
{
lua_pushnil(ls);
return 1;
}
const command_type cmd = name_to_command(luaL_checkstring(ls, 1));
string cmd_name = command_to_string(cmd, true);
if (strcmp(cmd_name.c_str(), "<") == 0)
cmd_name = "<<";
lua_pushstring(ls, cmd_name.c_str());
return 1;
}
LUAWRAP(crawl_endgame, screen_end_game(luaL_checkstring(ls, 1)))
LUAWRAP(crawl_tutorial_hunger, set_tutorial_hunger(luaL_checkint(ls, 1)))
LUAWRAP(crawl_tutorial_skill, set_tutorial_skill(luaL_checkstring(ls, 1), luaL_checkint(ls, 2)))
LUAWRAP(crawl_tutorial_hint, tutorial_init_hint(luaL_checkstring(ls, 1)))
LUAWRAP(crawl_print_hint, print_hint(luaL_checkstring(ls, 1)))
/**
* A random choice function crawl.random_element for clua.
*
* @param[in] list A lua array or table of elements to choose from. If list is
* an array, a random element is chosen from list. If list is a table, the
* values should be numeric or convertible to numeric and give the weights for
* their corresponding keys. A value with no key will default to a weight of
* 1. A random key is then returned based on these weights.
* @returns A random element from list.
*/
static int crawl_random_element(lua_State *ls)
{
const int table_idx = 1;
const int value_idx = 2;
if (lua_gettop(ls) == 0)
{
lua_pushnil(ls);
return 1;
}
// Only the first arg does anything now. Maybe this should
// select from a variable number of table args?
lua_pop(ls, lua_gettop(ls) - 1);
// Keep max value on the stack, as it could be any type of value.
lua_pushnil(ls);
int rollsize = 0;
lua_pushnil(ls);
while (lua_next(ls, table_idx) != 0)
{
const int weight_idx = -1;
const int key_idx = -2;
int this_weight = lua_isnil(ls, weight_idx) ?
1 : (int)lua_tonumber(ls, weight_idx);
if (rollsize > 0)
{
rollsize += this_weight;
if (x_chance_in_y(this_weight, rollsize))
{
lua_pushvalue(ls, key_idx);
lua_replace(ls, value_idx);
}
}
else
{
lua_pushvalue(ls, key_idx);
lua_replace(ls, value_idx);
rollsize = this_weight;
}
lua_pop(ls, 1);
}
lua_pushvalue(ls, value_idx);