-- $Id: constructs.lua,v 1.39 2015/03/04 13:09:38 roberto Exp $

;;print "testing syntax";;

local debug = require "debug"

-- testing semicollons
do ;;; end
; do ; a = 3; assert(a == 3) end;
;


-- invalid operations should not raise errors when not executed
if false then a = 3 // 0; a = 0 % 0 end


-- testing priorities

assert(2^3^2 == 2^(3^2));
assert(2^3*4 == (2^3)*4);
assert(2.0^-2 == 1/4 and -2^- -2 == - - -4);
assert(not nil and 2 and not(2>3 or 3<2));
assert(-3-1-5 == 0+0-9);
assert(-2^2 == -4 and (-2)^2 == 4 and 2*2-3-1 == 0);
assert(-3%5 == 2 and -3+5 == 2)
assert(2*1+3/3 == 3 and 1+2 .. 3*1 == "33");
assert(not(2+1 > 3*1) and "a".."b" > "a");

assert("7" .. 3 << 1 == 146)
assert(10 >> 1 .. "9" == 0)
assert(10 | 1 .. "9" == 27)

assert(0xF0 | 0xCC ~ 0xAA & 0xFD == 0xF4)
assert(0xFD & 0xAA ~ 0xCC | 0xF0 == 0xF4)
assert(0xF0 & 0x0F + 1 == 0x10)

assert(3^4//2^3//5 == 2)

assert(-3+4*5//2^3^2//9+4%10/3 == (-3)+(((4*5)//(2^(3^2)))//9)+((4%10)/3))

assert(not ((true or false) and nil))
assert(      true or false  and nil)

-- old bug
assert((((1 or false) and true) or false) == true)
assert((((nil and true) or false) and true) == false)

local a,b = 1,nil;
assert(-(1 or 2) == -1 and (1 and 2)+(-1.25 or -4) == 0.75);
x = ((b or a)+1 == 2 and (10 or a)+1 == 11); assert(x);
x = (((2<3) or 1) == true and (2<3 and 4) == 4); assert(x);

x,y=1,2;
assert((x>y) and x or y == 2);
x,y=2,1;
assert((x>y) and x or y == 2);

assert(1234567890 == tonumber('1234567890') and 1234567890+1 == 1234567891)


-- silly loops
repeat until 1; repeat until true;
while false do end; while nil do end;

do  -- test old bug (first name could not be an `upvalue')
 local a; function f(x) x={a=1}; x={x=1}; x={G=1} end
end

function f (i)
  if type(i) ~= 'number' then return i,'jojo'; end;
  if i > 0 then return i, f(i-1); end;
end

x = {f(3), f(5), f(10);};
assert(x[1] == 3 and x[2] == 5 and x[3] == 10 and x[4] == 9 and x[12] == 1);
assert(x[nil] == nil)
x = {f'alo', f'xixi', nil};
assert(x[1] == 'alo' and x[2] == 'xixi' and x[3] == nil);
x = {f'alo'..'xixi'};
assert(x[1] == 'aloxixi')
x = {f{}}
assert(x[2] == 'jojo' and type(x[1]) == 'table')


local f = function (i)
  if i < 10 then return 'a';
  elseif i < 20 then return 'b';
  elseif i < 30 then return 'c';
  end;
end

assert(f(3) == 'a' and f(12) == 'b' and f(26) == 'c' and f(100) == nil)

for i=1,1000 do break; end;
n=100;
i=3;
t = {};
a=nil
while not a do
  a=0; for i=1,n do for i=i,1,-1 do a=a+1; t[i]=1; end; end;
end
assert(a == n*(n+1)/2 and i==3);
assert(t[1] and t[n] and not t[0] and not t[n+1])

function f(b)
  local x = 1;
  repeat
    local a;
    if b==1 then local b=1; x=10; break
    elseif b==2 then x=20; break;
    elseif b==3 then x=30;
    else local a,b,c,d=math.sin(1); x=x+1;
    end
  until x>=12;
  return x;
end;

assert(f(1) == 10 and f(2) == 20 and f(3) == 30 and f(4)==12)


local f = function (i)
  if i < 10 then return 'a'
  elseif i < 20 then return 'b'
  elseif i < 30 then return 'c'
  else return 8
  end
end

assert(f(3) == 'a' and f(12) == 'b' and f(26) == 'c' and f(100) == 8)

local a, b = nil, 23
x = {f(100)*2+3 or a, a or b+2}
assert(x[1] == 19 and x[2] == 25)
x = {f=2+3 or a, a = b+2}
assert(x.f == 5 and x.a == 25)

a={y=1}
x = {a.y}
assert(x[1] == 1)

function f(i)
  while 1 do
    if i>0 then i=i-1;
    else return; end;
  end;
end;

function g(i)
  while 1 do
    if i>0 then i=i-1
    else return end
  end
end

f(10); g(10);

do
  function f () return 1,2,3; end
  local a, b, c = f();
  assert(a==1 and b==2 and c==3)
  a, b, c = (f());
  assert(a==1 and b==nil and c==nil)
end

local a,b = 3 and f();
assert(a==1 and b==nil)

function g() f(); return; end;
assert(g() == nil)
function g() return nil or f() end
a,b = g()
assert(a==1 and b==nil)

print'+';


f = [[
return function ( a , b , c , d , e )
  local x = a >= b or c or ( d and e ) or nil
  return x
end , { a = 1 , b = 2 >= 1 , } or { 1 };
]]
f = string.gsub(f, "%s+", "\n");   -- force a SETLINE between opcodes
f,a = load(f)();
assert(a.a == 1 and a.b)

function g (a,b,c,d,e)
  if not (a>=b or c or d and e or nil) then return 0; else return 1; end;
end

function h (a,b,c,d,e)
  while (a>=b or c or (d and e) or nil) do return 1; end;
  return 0;
end;

assert(f(2,1) == true and g(2,1) == 1 and h(2,1) == 1)
assert(f(1,2,'a') == 'a' and g(1,2,'a') == 1 and h(1,2,'a') == 1)
assert(f(1,2,'a')
~=          -- force SETLINE before nil
nil, "")
assert(f(1,2,'a') == 'a' and g(1,2,'a') == 1 and h(1,2,'a') == 1)
assert(f(1,2,nil,1,'x') == 'x' and g(1,2,nil,1,'x') == 1 and
                                   h(1,2,nil,1,'x') == 1)
assert(f(1,2,nil,nil,'x') == nil and g(1,2,nil,nil,'x') == 0 and
                                     h(1,2,nil,nil,'x') == 0)
assert(f(1,2,nil,1,nil) == nil and g(1,2,nil,1,nil) == 0 and
                                   h(1,2,nil,1,nil) == 0)

assert(1 and 2<3 == true and 2<3 and 'a'<'b' == true)
x = 2<3 and not 3; assert(x==false)
x = 2<1 or (2>1 and 'a'); assert(x=='a')


do
  local a; if nil then a=1; else a=2; end;    -- this nil comes as PUSHNIL 2
  assert(a==2)
end

function F(a)
  assert(debug.getinfo(1, "n").name == 'F')
  return a,2,3
end

a,b = F(1)~=nil; assert(a == true and b == nil);
a,b = F(nil)==nil; assert(a == true and b == nil)

----------------------------------------------------------------
------------------------------------------------------------------

-- sometimes will be 0, sometimes will not...
_ENV.GLOB1 = math.floor(os.time()) % 2

-- basic expressions with their respective values
local basiccases = {
  {"nil", nil},
  {"false", false},
  {"true", true},
  {"10", 10},
  {"(0==_ENV.GLOB1)", 0 == _ENV.GLOB1},
}

print('testing short-circuit optimizations (' .. _ENV.GLOB1 .. ')')


-- operators with their respective values
local binops = {
  {" and ", function (a,b) if not a then return a else return b end end},
  {" or ", function (a,b) if a then return a else return b end end},
}

local cases = {}

-- creates all combinations of '(cases[i] op cases[n-i])' plus
-- 'not(cases[i] op cases[n-i])' (syntax + value)
local function createcases (n)
  local res = {}
  for i = 1, n - 1 do
    for _, v1 in ipairs(cases[i]) do
      for _, v2 in ipairs(cases[n - i]) do
        for _, op in ipairs(binops) do
            local t = {
              "(" .. v1[1] .. op[1] .. v2[1] .. ")",
              op[2](v1[2], v2[2])
            }
            res[#res + 1] = t
            res[#res + 1] = {"not" .. t[1], not t[2]}
        end
      end
    end
  end
  return res
end

-- do not do too many combinations for soft tests
local level = _soft and 3 or 4

cases[1] = basiccases
for i = 2, level do cases[i] = createcases(i) end
print("+")

local prog = [[if %s then IX = true end; return %s]]

local i = 0
for n = 1, level do
  for _, v in pairs(cases[n]) do
    local s = v[1]
    local p = load(string.format(prog, s, s), "")
    IX = false
    assert(p() == v[2] and IX == not not v[2])
    i = i + 1
    if i % 60000 == 0 then print('+') end
  end
end
------------------------------------------------------------------

-- testing some syntax errors (chosen through 'gcov')
assert(string.find(select(2, load("for x do")), "expected"))
assert(string.find(select(2, load("x:call")), "expected"))

print'OK'