Lua In Free Pascal

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[Free Pascal] is a well-supported Pascal compiler available on many platforms.

All routines from the C API and auxiliary library mentioned in the Lua 5.1 reference manual are supported in the lua, lualib or lauxlib libraries of Free Pascal 2.4. There is no documentation, but you can use the Lua manual since the call sequences are basically identical, with a few exceptions.

In order to split strings over multiple lines in Free Pascal, create multiple string constants that are concatenated via the '+' operator. Alternatively, you can store your Lua code in files, or put it all on one line.

Type names

luaL_Reg    => lua_CFunction

Most others are obvious, with P used for pointer, e.g.

luaState*   => Plua_State

or standard, e.g.

void*       => Pointer
int         => Integer

You can always look at the interface of lauxlib.pas etc (package fpc-source on Ubuntu) to make sure.

Routine names

Some names starting with lua_L are different (probably typos):

luaL_dofile         => lua_dofile
luaL_dostring       => lua_dostring
luaL_getmetatable   => lua_Lgetmetatable

Minimal usage example

uses lua, lualib, lauxlib;

var L: Plua_State;

begin
    L := lua_open(); luaL_openlibs(L);
    result := lua_dostring(L, 
'for k in string.gmatch("a,b,c,d,e,f,g,h","([^,]+),") do print(k) end'
);
    lua_close(L);
end.

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Last edited April 20, 2011 9:49 am GMT (diff)