openmw/files/lua_api/global.doclua

-------------------------------------------------------------------------------
-- Lua global variables.
-- The basic library provides some core functions to Lua.
-- All the preloaded module of Lua are declared here.
-- @module global

------------------------------------------------------------------------------
-- This library provides generic functions for coroutine manipulation.
-- This is a global variable which hold the preloaded @{coroutine} module.
-- @field[parent = #global] coroutine#coroutine coroutine preloaded module

------------------------------------------------------------------------------
-- This library provides generic functions for string manipulation.
-- This is a global variable which hold the preloaded @{string} module.
-- @field[parent = #global] string#string string preloaded module

------------------------------------------------------------------------------
-- This library provides generic functions for table manipulation.
-- This is a global variable which hold the preloaded @{table} module.
-- @field[parent = #global] table#table table preloaded module

------------------------------------------------------------------------------
-- This library is an interface to the standard C math library.
-- This is a global variable which hold the preloaded @{math} module.
-- @field[parent = #global] math#math math preloaded module

-------------------------------------------------------------------------------
-- Issues an error when the value of its argument `v` is false (i.e.,
-- **nil** or **false**); otherwise, returns all its arguments. `message` is an error
-- message; when absent, it defaults to *"assertion failed!"*.
-- @function [parent=#global] assert
-- @param v if this argument is false an error is issued.
-- @param #string message an error message. defaults value is *"assertion failed"*.
-- @return All its arguments.

-------------------------------------------------------------------------------
-- Terminates the last protected function called and returns `message`
-- as the error message. Function `error` never returns.
--
-- Usually, `error` adds some information about the error position at the
-- beginning of the message. The `level` argument specifies how to get the
-- error position.  
-- With level 1 (the default), the error position is where the
-- `error` function was called.  
-- Level 2 points the error to where the function
-- that called `error` was called; and so on.  
-- Passing a level 0 avoids the addition of error position information to the message.
-- @function [parent=#global] error
-- @param #string message an error message.
-- @param #number level specifies how to get the error position, default value is `1`.

-------------------------------------------------------------------------------
-- If `object` does not have a metatable, returns nil. Otherwise, if the
-- object's metatable has a `"__metatable"` field, returns the associated
-- value. Otherwise, returns the metatable of the given object.
-- @function [parent=#global] getmetatable
-- @param object
-- @return #table the metatable of object.

-------------------------------------------------------------------------------
-- Use to iterate over a table by index.
-- Returns three values: an iterator function, the table `t`, and 0,
-- so that the construction :
-- 
--     for i,v in ipairs(t) do *body* end
-- will iterate over the pairs (`1,t[1]`), (`2,t[2]`), ..., up to the
-- first integer key absent from the table.
-- @function [parent=#global] ipairs
-- @param #table t a table by index.

-------------------------------------------------------------------------------
-- Allows a program to traverse all fields of a table. Its first argument is
-- a table and its second argument is an index in this table. `next` returns
-- the next index of the table and its associated value.
--
-- When called with nil
-- as its second argument, `next` returns an initial index and its associated
-- value. When called with the last index, or with nil in an empty table, `next`
-- returns nil.
--
-- If the second argument is absent, then it is interpreted as
-- nil. In particular, you can use `next(t)` to check whether a table is empty.
-- The order in which the indices are enumerated is not specified, *even for
-- numeric indices*. (To traverse a table in numeric order, use a numerical
-- for or the `ipairs` function.)
--
-- The behavior of `next` is *undefined* if, during the traversal, you assign
-- any value to a non-existent field in the table. You may however modify
-- existing fields. In particular, you may clear existing fields.
-- @function [parent=#global] next
-- @param #table table table to traverse.
-- @param index initial index.

-------------------------------------------------------------------------------
-- Use to iterate over a table.
-- Returns three values: the `next` function, the table `t`, and nil,
-- so that the construction :
-- 
--     for k,v in pairs(t) do *body* end
-- will iterate over all key-value pairs of table `t`.
-- 
-- See function `next` for the caveats of modifying the table during its
-- traversal.
-- @function [parent=#global] pairs
-- @param #table t table to traverse.

-------------------------------------------------------------------------------
-- Calls function `f` with the given arguments in *protected mode*. This
-- means that any error inside `f` is not propagated; instead, `pcall` catches
-- the error and returns a status code. Its first result is the status code (a
-- boolean), which is true if the call succeeds without errors. In such case,
-- `pcall` also returns all results from the call, after this first result. In
-- case of any error, `pcall` returns false plus the error message.
-- @function [parent=#global] pcall
-- @param f function to be call in *protected mode*.
-- @param ... function arguments.
-- @return #boolean true plus the result of `f` function if its call succeeds without errors.
-- @return #boolean,#string  false plus the error message in case of any error.

-------------------------------------------------------------------------------
-- Receives any number of arguments, and prints their values to OpenMW log,
-- using the `tostring` function to convert them to strings. `print` is not
-- intended for formatted output, but only as a quick way to show a value,
-- typically for debugging. For formatted output, use `string.format`.
-- 
-- @function [parent=#global] print
-- @param ... values to print to `stdout`.

-------------------------------------------------------------------------------
-- Checks whether `v1` is equal to `v2`, without invoking any
-- metamethod. Returns a boolean.
-- @function [parent=#global] rawequal
-- @param v1
-- @param v2
-- @return #boolean true if `v1` is equal to `v2`. 

-------------------------------------------------------------------------------
-- Gets the real value of `table[index]`, without invoking any
-- metamethod. `table` must be a table; `index` may be any value.
-- @function [parent=#global] rawget
-- @param #table table
-- @param index may be any value.
-- @return The real value of `table[index]`, without invoking any
-- metamethod.

-------------------------------------------------------------------------------
-- Sets the real value of `table[index]` to `value`, without invoking any
-- metamethod. `table` must be a table, `index` any value different from nil,
-- and `value` any Lua value.  
-- This function returns `table`.
-- @function [parent=#global] rawset
-- @param #table table
-- @param index any value different from nil.
-- @param value any Lua value.

-------------------------------------------------------------------------------
-- If `index` is a number, returns all arguments after argument number
-- `index`. Otherwise, `index` must be the string `"#"`, and `select` returns
-- the total number of extra arguments it received.
-- @function [parent=#global] select
-- @param index a number or the string `"#"`
-- @param ...

-------------------------------------------------------------------------------
-- Sets the metatable for the given table. (You cannot change the metatable
-- of other types from Lua, only from C.) If `metatable` is nil, removes the
-- metatable of the given table. If the original metatable has a `"__metatable"`
-- field, raises an error.  
-- This function returns `table`.
-- @function [parent=#global] setmetatable
-- @param #table table 
-- @param #table metatable
-- @return The first argument `table`. 

-------------------------------------------------------------------------------
-- Tries to convert its argument to a number. If the argument is already
-- a number or a string convertible to a number, then `tonumber` returns this
-- number; otherwise, it returns **nil.**
--
-- An optional argument specifies the base to interpret the numeral. The base
-- may be any integer between 2 and 36, inclusive. In bases above 10, the
-- letter '`A`' (in either upper or lower case) represents 10, '`B`' represents
-- 11, and so forth, with '`Z`' representing 35. In base 10 (the default),
-- the number can have a decimal part, as well as an optional exponent part.
-- In other bases, only unsigned integers are accepted.
-- @function [parent=#global] tonumber
-- @param e a number or string to convert to a number.
-- @param #number base the base to interpret the numeral, any integer between 2 and 36.(default is 10).
-- @return #number a number if conversion succeeds else **nil**.

-------------------------------------------------------------------------------
-- Receives an argument of any type and converts it to a string in a
-- reasonable format. For complete control of how numbers are converted, use
-- `string.format`.
--
-- If the metatable of `e` has a `"__tostring"` field, then `tostring` calls
-- the corresponding value with `e` as argument, and uses the result of the
-- call as its result.
-- @function [parent=#global] tostring
-- @param e an argument of any type.
-- @return #string a string in a reasonable format.

-------------------------------------------------------------------------------
-- Returns the type of its only argument, coded as a string. The possible
-- results of this function are "
-- `nil`" (a string, not the value nil), "`number`", "`string`", "`boolean`",
-- "`table`", "`function`", "`thread`", and "`userdata`".
-- @function [parent=#global] type
-- @param v any value.
-- @return #string the type of `v`.

-------------------------------------------------------------------------------
-- Returns the elements from the given table. This function is equivalent to
-- 
--     return list[i], list[i+1], ..., list[j]
-- except that the above code can be written only for a fixed number of
-- elements. By default, `i` is 1 and `j` is the length of the list, as
-- defined by the length operator.
-- @function [parent=#global] unpack
-- @param #table list a table by index
-- @param i index of first value.
-- @param j index of last value.

-------------------------------------------------------------------------------
-- A global variable (not a function) that holds a string containing the
-- current interpreter version. The current contents of this variable is
-- "`Lua 5.1`".
-- @field [parent = #global] #string _VERSION

-------------------------------------------------------------------------------
-- This function is similar to `pcall`, except that you can set a new
-- error handler.
--
-- `xpcall` calls function `f` in protected mode, using `err` as the error
-- handler. Any error inside `f` is not propagated; instead, `xpcall` catches
-- the error, calls the `err` function with the original error object, and
-- returns a status code. Its first result is the status code (a boolean),
-- which is true if the call succeeds without errors. In this case, `xpcall`
-- also returns all results from the call, after this first result. In case
-- of any error, `xpcall` returns false plus the result from `err`.
-- @function [parent=#global] xpcall
-- @param f function to be call in *protected mode*.
-- @param err function used as error handler.
-- @return #boolean true plus the result of `f` function if its call succeeds without errors.
-- @return #boolean,#string  false plus the result of `err` function. 

-------------------------------------------------------------------------------
-- Loads the given module. 
-- If the requested module is one of the allowed standard libraries
-- (`coroutine`, `math`, `string`, `table`), then returns the library.
-- If it is one of the built-in OpenMW API packages, then returns the package.
-- Otherwise it searches for a Lua source file with such name in OpenMW data folders.
-- For example `require('my_lua_library.something')` will try to open the file
-- `my_lua_library/something.lua`.
--
-- Loading DLLs and precompiled Lua files is intentionally prohibited for reasons
-- of safety and compatibility between different platforms.
--
-- If there is any error loading or running the module, or if it cannot find
-- any loader for the module, then `require` signals an error.
-- @function [parent=#global] require
-- @param #string modname name of module to load.

return nil