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pretty/test/test_function.lua

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local SUITE = require('TestSuite').new('function')
SUITE:setEnviroment{
format = require('pretty')
}
--------------------------------------------------------------------------------
local HAS_ADV_GETLOCAL = not not debug.getinfo(1, 'u').nparams -- Lua 5.1 compat
if not loadstring then loadstring = load end -- Lua 5.3 compat
local function format_test (t)
if t.longterm then return end
if t.adv_getlocal and not HAS_ADV_GETLOCAL then return end
SUITE:addTest(t.name or t.expect, function ()
local input_value = t.input
local input_options = t.options
local expected_result = t.expect
local actual_result = format(input_value, input_options)
if not t.approx or type(actual_result) ~= 'string' then
assert_equal(expected_result, actual_result)
else
if not actual_result:match(expected_result) then
error(ASSERT_ERROR_APPROX:format(expected_result, actual_result))
end
end
end)
end
local function curline (delta)
return debug.getinfo(2).currentline + (delta or 0)
end
--------------------------------------------------------------------------------
-- Function printing
format_test {
adv_getlocal = true,
input = function () end,
expect = 'function () ... end',
}
format_test {
adv_getlocal = true,
input = function (a) end,
expect = 'function (a) ... end',
}
format_test {
adv_getlocal = true,
input = function (a, b) end,
expect = 'function (a, b) ... end',
}
format_test {
adv_getlocal = true,
input = function (...) end,
expect = 'function (...) ... end',
}
format_test {
adv_getlocal = true,
input = function (a, b, ...) end,
expect = 'function (a, b, ...) ... end',
}
do
local SOME_RANDOM_UPVALUE = false
format_test {
adv_getlocal = true,
input = function () l = SOME_RANDOM_UPVALUE end,
expect = 'function () ... end',
}
format_test {
adv_getlocal = true,
input = function () SOME_RANDOM_UPVALUE = true end,
expect = 'function () ... end',
}
format_test {
-- More function info is ignored if not at depth 0.
adv_getlocal = true,
input = { a = function () SOME_RANDOM_UPVALUE = true end },
options = { more_function_info = true },
expect = '{\n\ta = function () ... end\n}',
}
local func_line = curline(2) -- Must be exactly 2 lines above function
format_test {
input = function () l = SOME_RANDOM_UPVALUE end,
adv_getlocal = true,
options = { more_function_info = true },
expect = 'function ()\n\t-- source_file: \'./test/test_function.lua\' [Line: '..func_line..']\n\t-- up_values: { SOME_RANDOM_UPVALUE = false }\n\n\t...\nend'
}
local func_line = curline(2) -- Must be exactly 2 lines above function
format_test {
input = function () SOME_RANDOM_UPVALUE = true end,
adv_getlocal = true,
options = { more_function_info = true },
expect = 'function ()\n\t-- source_file: \'./test/test_function.lua\' [Line: '..func_line..']\n\t-- up_values: { SOME_RANDOM_UPVALUE = false }\n\n\t...\nend'
}
end
do
local func_line = curline(2) -- Must be exactly 2 lines above function
format_test {
input = function () end,
adv_getlocal = true,
options = { more_function_info = true },
expect = 'function ()\n\t-- source_file: \'./test/test_function.lua\' [Line: '..func_line..']\n\n\t...\nend'
}
end
do
local index = 0
format_test {
input = function () index = index + 1; return index end,
adv_getlocal = true,
expect = 'function () ... end'
}
local func_line = curline(2) -- Must be exactly 2 lines above function
format_test {
input = function () index = index + 1; return index end,
adv_getlocal = true,
options = { more_function_info = true },
expect = 'function ()\n\t-- source_file: \'./test/test_function.lua\' [Line: '..func_line..']\n\t-- up_values: { index = 0 }\n\n\t...\nend'
}
end
format_test {
adv_getlocal = true,
input = loadstring('return function () end')(),
expect = 'function () end',
}
format_test {
adv_getlocal = true,
input = loadstring('return function () return function () end end')(),
expect = 'function () return function () end end',
}
format_test {
adv_getlocal = true,
input = loadstring('return function () return function () end\nend')()(),
expect = 'function () end',
}
format_test {
-- NOTE: This is HARD to fix. It's thus longerterm
adv_getlocal = true,
input = loadstring('return function () return function () end end')()(),
expect = 'function () end',
}
format_test {
-- More function info allows one to even get the function whole, if it was defined in a string.
input = loadstring('return function (a, b) return a + b end')(),
options = { more_function_info = true },
expect = 'function (a, b) return a + b end',
}
format_test {
-- More function info allows one to even get the function whole, if it was defined in a string.
input = loadstring('return function (a, b)\n\treturn a + b\nend')(),
options = { more_function_info = true },
expect = 'function (a, b)\n\treturn a + b\nend',
}
do
local func_line = curline(2) -- Must be exactly 2 lines above function
format_test {
input = function ()
-- NOTE: This function must cover 3 lines of code!
end,
adv_getlocal = true,
options = { more_function_info = true },
expect = 'function ()\n\t-- source_file: \'./test/test_function.lua\' [Lines: '..func_line..' - '..(func_line+2)..']\n\n\t...\nend',
}
local func_line = curline(2) -- Must be exactly 2 lines above function
format_test {
input = function () --[[ NOTE: This function must cover a single line of code! ]] end,
adv_getlocal = true,
options = { more_function_info = true },
expect = 'function ()\n\t-- source_file: \'./test/test_function.lua\' [Line: '..func_line..']\n\n\t...\nend',
}
end
format_test {
input = math.abs,
expect = 'builtin function (x) ... end',
}
format_test {
input = math.abs,
options = { more_function_info = true },
expect = 'builtin function (x)\n\t-- math.abs\n\t-- Returns the absolute value of x.\n\n\t...\nend',
}
format_test {
input = math.random,
expect = 'builtin function ([m [, n]) ... end',
}
format_test {
input = math.random,
options = { more_function_info = true },
expect = 'builtin function ([m [, n])\n\t-- math.random\n\t-- When called without arguments, returns a uniform pseudo-random real number in the range [0,1). When called with an integer number m, math.random returns a uniform pseudo-random integer in the range [1, m]. When called with two integer numbers m and n, math.random returns a uniform pseudo-random integer in the range [m, n].\n\n\t...\nend',
}
format_test {
input = string.byte,
options = { more_function_info = true },
expect = 'builtin function (s [, i [, j]])\n\t-- string.byte\n\t-- Returns the internal numerical codes of the characters s[i], s[i+1], ..., s[j]. The default value for i is 1; the default value for j is i.\n\t-- Note that numerical codes are not necessarily portable across platforms.\n\n\t...\nend',
}
-- short_builtins option: If an builtin is expected to be available by some name
-- in a standard enviroment, return that name, instead of other complex info.
format_test {
input = math.random,
options = { short_builtins = true },
expect = 'math.random',
}
format_test {
input = { math.cos, math.sin, math.abs },
options = { short_builtins = true },
expect = '{\n\tmath.cos,\n\tmath.sin,\n\tmath.abs\n}',
}
--------------------------------------------------------------------------------
-- Closure creation
-- include_closure option: If a function uses upvalues, return code that creates
-- a closure for that function, including the function code.
-- NOTE: Without AST traversal, it's impossible to garentee that values refered
-- by multiple recursive closures are the same, because they can actually refer
-- to different variables with the same name, as the following example shows:
--
-- local val_a = 1
-- local func_a = function () return val_a end
-- local val_a = 2
-- local func_c = function () return func_a() + val_a end
do
format_test {
adv_getlocal = true,
options = { more_function_info = true, include_closure = true },
input = function (a, b) return (a > b) and a or b end,
expect = 'function (a, b) return (a > b) and a or b end',
}
end
do
local input_func = (function ()
local i = 0
return function (a) i = i + a; return i end
end)()
for i = 1, 10 do input_func(1) end
format_test {
adv_getlocal = true,
options = { more_function_info = true, include_closure = true },
input = input_func,
expect = '(function () local i = 10; return function (a) i = i + a; return i end end)()',
}
end
do
local input_func = loadstring([[
return function ()
local i = 0
return function (a) i = i + a; return i end
end]])()()
for i = 1, 10 do input_func(1) end
format_test {
name = 'Can include variables in closure',
adv_getlocal = true,
options = { more_function_info = true, include_closure = true },
input = input_func,
expect = '(function () local i = 10; return function (a) i = i + a; return i end end)()',
}
end
format_test {
name = 'Can include functions in closure',
adv_getlocal = true,
options = { more_function_info = true, include_closure = true },
input = (function ()
local custom_max = function (a, b) return (a > b) and a or b end
return function (a, b) return custom_max(a, b) + 2 end
end)(),
expect = '(function () local custom_max = function (a, b) return (a > b) and a or b end; return function (a, b) return custom_max(a, b) + 2 end end)()',
}
format_test {
name = 'Can include functions defined with `function <name> () ...` style',
adv_getlocal = true,
options = { more_function_info = true, include_closure = true },
input = (function ()
local function custom_max (a, b) return (a > b) and a or b end
return function (a, b) return custom_max(a, b) + 2 end
end)(),
expect = '(function () local custom_max = function (a, b) return (a > b) and a or b end; return function (a, b) return custom_max(a, b) + 2 end end)()',
}
do
local custom_max = function (a, b) return (a > b) and a or b end
format_test {
name = 'Can include functions from outside scope into closure',
adv_getlocal = true,
options = { more_function_info = true, include_closure = true },
input = (function ()
return function (a, b) return custom_max(a, b) + 2 end
end)(),
expect = '(function () local custom_max = function (a, b) return (a > b) and a or b end; return function (a, b) return custom_max(a, b) + 2 end end)()',
}
end
do
local a_func = function (x) return x + 2 end
local b_func = function (x) return a_func(x) * a_func(x) end
local c_func = function (x) return b_func(a_func(x)) end
format_test {
name = 'Can support recursive closures',
adv_getlocal = true,
options = { more_function_info = true, include_closure = true },
input = c_func,
expect = '(function () local b_func = (function () local a_func = function (x) return x + 2 end; return function (x) return a_func(x) * a_func(x) end end)(); local a_func = function (x) return x + 2 end; return function (x) return b_func(a_func(x)) end end)()',
}
end
format_test {
name = 'Closures do not affect builtins',
input = math.abs,
options = { more_function_info = true, include_closure = true },
expect = 'builtin function (x)\n\t-- math.abs\n\t-- Returns the absolute value of x.\n\n\t...\nend',
}
--------------------------------------------------------------------------------
-- Indent functions nicely
format_test {
-- The tail part should align, letting people focus on the important aspects.
input = { random = math.random, abs = math.abs },
expect = '{\n\tabs = builtin function (x) ... end,\n\trandom = builtin function ([m [, n]) ... end\n}',
}
format_test {
-- The function part should align, if some are builtin and some are not.
adv_getlocal = true,
input = { random = math.random, abs = function (x) return x < 0 and -x or x end },
expect = '{\n\tabs = function (x) ... end,\n\trandom = builtin function ([m [, n]) ... end\n}',
}
format_test {
-- No special indent if no special function modifier.
adv_getlocal = true,
input = { max = function(a, b) return a > b and a or b end,
abs = function (x) return x < 0 and -x or x end
},
expect = '{\n\tabs = function (x) ... end,\n\tmax = function (a, b) ... end\n}',
}
--------------------------------------------------------------------------------
--[[
format_test {
adv_getlocal = true,
options = { more_function_info = true, _all_function_info = true, max_depth = 2 },
input = function() end,
expect = '',
}
--]]
return SUITE
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