#!/usr/bin/env lua

-- Metatables
t = <beginfold id='1'>{</beginfold id='1'>
    __add=<beginfold id='2'>function</beginfold id='2'>(a,b)return a+b <endfold id='2'>end</endfold id='2'>,
    __sub=<beginfold id='2'>function</beginfold id='2'>(a,b)return a-b <endfold id='2'>end</endfold id='2'>,
    __mul=<beginfold id='2'>function</beginfold id='2'>(a,b)return a*b <endfold id='2'>end</endfold id='2'>,
    __div=<beginfold id='2'>function</beginfold id='2'>(a,b)return a/b <endfold id='2'>end</endfold id='2'>,
    __mod=<beginfold id='2'>function</beginfold id='2'>(a,b)return a%b <endfold id='2'>end</endfold id='2'>,
    __pow=<beginfold id='2'>function</beginfold id='2'>(a,b)return a^b <endfold id='2'>end</endfold id='2'>,
    __unm=<beginfold id='2'>function</beginfold id='2'>(a)return -a <endfold id='2'>end</endfold id='2'>,
    __idiv=<beginfold id='2'>function</beginfold id='2'>(a,b)return a//b <endfold id='2'>end</endfold id='2'>,
    __band=<beginfold id='2'>function</beginfold id='2'>(a,b)return a&b <endfold id='2'>end</endfold id='2'>,
    __bor=<beginfold id='2'>function</beginfold id='2'>(a,b)return a|b <endfold id='2'>end</endfold id='2'>,
    __bxor=<beginfold id='2'>function</beginfold id='2'>(a,b)return a~b <endfold id='2'>end</endfold id='2'>,
    __bnot=<beginfold id='2'>function</beginfold id='2'>(a)return ~a <endfold id='2'>end</endfold id='2'>,
    __shl=<beginfold id='2'>function</beginfold id='2'>(a,b)return a<<b <endfold id='2'>end</endfold id='2'>,
    __shr=<beginfold id='2'>function</beginfold id='2'>(a,b)return a>>b <endfold id='2'>end</endfold id='2'>,
    __concat=<beginfold id='2'>function</beginfold id='2'>(a,b)return a..b <endfold id='2'>end</endfold id='2'>,
    __len=<beginfold id='2'>function</beginfold id='2'>(a)return #a <endfold id='2'>end</endfold id='2'>,
    __eq=<beginfold id='2'>function</beginfold id='2'>(a,b)return a==b <endfold id='2'>end</endfold id='2'>,
    __lt=<beginfold id='2'>function</beginfold id='2'>(a,b)return a<b <endfold id='2'>end</endfold id='2'>,
    __le=<beginfold id='2'>function</beginfold id='2'>(a,b)return a<=b <endfold id='2'>end</endfold id='2'>,
    __index=<beginfold id='2'>function</beginfold id='2'>(t,k)return t[k] <endfold id='2'>end</endfold id='2'>,
    __newindex=<beginfold id='2'>function</beginfold id='2'>(t,k,v)return t[k]=v <endfold id='2'>end</endfold id='2'>,
    __call=<beginfold id='2'>function</beginfold id='2'>(f, ...)return f(...) <endfold id='2'>end</endfold id='2'>,

   __tostring=<beginfold id='2'>function</beginfold id='2'>(a)return tostring(a) <endfold id='2'>end</endfold id='2'>,
   __pairs=<beginfold id='2'>function</beginfold id='2'>(t)return pairs(a) <endfold id='2'>end</endfold id='2'>,
   -- setmetatable
   __metatable=true
   -- Garbage collector
   __gc=<beginfold id='2'>function</beginfold id='2'>() <endfold id='2'>end</endfold id='2'>
   -- Weak table
   __mode='k' -- or 'v'
<endfold id='1'>}</endfold id='1'>

a or b
a and b
a~=b
a>=b
true or false
a or nil
a::m
a.m
a;a


-- String
'\a'
'\b'
'\f'
'\n'
'\r'
'\t'
'\v'
'\\'
'\"'
'\''
'\z'
'\xff'
'\xFF'
'\231'
'\23'
'\2'
'\u{100201}' -- max 6 digits
'\2a\ks' -- error

'multi\
line'
'multi\z
line'
'multi\z    line\
2'

a = 'alo\n123"'
a = "alo\n123\""
a = '\97lo\10\04923"'
a = [[alo
123"]]
a = [==[
alo
123"]==]


-- Decimal
3
345
0xff
0xBEBADA

-- Float
3.
.3
3.0
3.1416
314.16e-2
314.e+2
0.31416E1
34e1
0.e3
0x0.1E
0xA23p-4
0xA.p+4
0x.ap4
0X1.921FB54442D18P+1
-- error
32p
0xp-4
0x.p-4
3.x


-- single comment
xyz()
<beginfold id='3'>--[[</beginfold id='3'>
 long comment
<endfold id='3'>]]</endfold id='3'>
xyz()


a = <beginfold id='1'>{</beginfold id='1'> [f(1)] = g; "x", "y"; x = 1, f(x), [30] = 23; 45 <endfold id='1'>}</endfold id='1'>

-- is equivalent to

<beginfold id='2'>do</beginfold id='2'>
  local t = <beginfold id='1'>{</beginfold id='1'><endfold id='1'>}</endfold id='1'>
  t[f(1)] = g
  t[1] = "x" -- 1st exp
  t[2] = "y" -- 2nd exp
  t.x = 1 -- t["x"] = 1
  t[3] = f(x) -- 3rd exp
  t[30] = 23
  t[4] = 45 -- 4th exp
  a = t
<endfold id='2'>end</endfold id='2'>

32-0x43+0x2-5
return"a"
return'a'
return<beginfold id='1'>{</beginfold id='1'><endfold id='1'>}</endfold id='1'>
f(3)
f'a'
f"a"
f<beginfold id='1'>{</beginfold id='1'>s=2<endfold id='1'>}</endfold id='1'>
f[[s]]
f[=[s]=]
#a

local CONSTANT = a

a = <beginfold id='1'>{</beginfold id='1'><endfold id='1'>}</endfold id='1'>
local x = 20
for i=1,10 <beginfold id='2'>do</beginfold id='2'>
  local y = 0
  a[i] = <beginfold id='2'>function</beginfold id='2'> () y=y+1; return x+y <endfold id='2'>end</endfold id='2'>
<endfold id='2'>end</endfold id='2'>

local <beginfold id='2'>function</beginfold id='2'> foo()
<endfold id='2'>end</endfold id='2'>

--! \brief gfind is deprecated
string.gfind('s')
string.gmatch('f')

<beginfold id='2'>function</beginfold id='2'> foo()
  <beginfold id='2'>if</beginfold id='2'> x then
    <beginfold id='2'>function</beginfold id='2'>() <endfold id='2'>end</endfold id='2'>
    bar=<beginfold id='2'>function</beginfold id='2'>()
      <beginfold id='2'>if</beginfold id='2'> y then
        <beginfold id='2'>if</beginfold id='2'> z then <endfold id='2'>end</endfold id='2'>
      <endfold id='2'>end</endfold id='2'>
    <endfold id='2'>end</endfold id='2'>
  <endfold id='2'>end</endfold id='2'>
<endfold id='2'>end</endfold id='2'>

-- attributes
local a<const> = 2
local a<const> print(a)
local f <close>, const <    const >
local a <cloe>, b< cons >, c<const, d<close> ; a<b
local a <cloe> -- bla, 
b< cons >
local a <close> <beginfold id='3'>--[[</beginfold id='3'>
b <const><endfold id='3'>]]</endfold id='3'>, b <const> <beginfold id='3'>--[[</beginfold id='3'> xyz <endfold id='3'>]]</endfold id='3'> , c <close>
b< cons >

--- <beginfold id='4'>\code</beginfold id='4'>
--! a = 3
--! <endfold id='4'>\endcode</endfold id='4'>
a = 3
