pretty/test/test_pretty.lua

local SUITE = require('TestSuite').new('pretty')
SUITE:setEnviroment{
    format  = require('pretty')
}

local ASSERT_ERROR_APPROX = [[
Approximate strings not similar enough:
    Should match: %s
    Gotten:       %s
]]

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

-- Lua 5.1 compat:

local HAS_ADV_GETLOCAL = not not debug.getinfo(1, 'u').nparams

-- Lua 5.3 compat:

if not loadstring then
    loadstring = load
end

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.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(actual_result, expected_result)
        else
            if not actual_result:match(expected_result) then
                error(ASSERT_ERROR_APPROX:format(expected_result, actual_result))
            end
        end
    end)
end

--------------------------------------------------------------------------------
-- Strings

format_test {
    input  = 'Hello World',
    expect = '\'Hello World\'',
}

format_test {
    input  = 'Hello \'World\'',
    expect = '\"Hello \'World\'\"',
}

format_test {
    input  = 'Hello \"World\"',
    expect = '\'Hello \"World\"\'',
}

format_test {
    input  = 'Hello [[World]]',
    expect = '\'Hello [[World]]\'',
}

format_test {
    input  = '\'Hello\' [[World]]',
    expect = '\"\'Hello\' [[World]]\"',
}

format_test {
    input  = '\'Hello\' \"there\" [[World]]',
    expect = '[=[\'Hello\' \"there\" [[World]]]=]',
}

format_test {
    input  = '\'Hello\' \"there\" [=[World]=]',
    expect = '[[\'Hello\' \"there\" [=[World]=]]]',
}

format_test {
    input  = '\nHello World',
    expect = '\'\\nHello World\'',
}

format_test {
    input  = '\'\"\n',
    expect = '[[\n\'\"\n]]',
}

format_test {
    input  = '\n',
    expect = '\'\\n\'',
}

format_test {
    input  = '\\',
    expect = '\'\\\\\'',
}

format_test {
    input  = '\000',
    expect = '\'\\000\'',
}

format_test {
    input  = '\a\b\v\r\f',
    expect = '\'\\a\\b\\v\\r\\f\'',
}

format_test {
    input  = 'ø',
    expect = '\'ø\'',
}

--------------------------------------------------------------------------------
-- Numbers

format_test {
    input  = 0,
    expect = '0',
}

format_test {
    input  = 2000,
    expect = '2000',
}

format_test {
    input  = -2000,
    expect = '-2000',
}

format_test {
    input  = 1/0,   -- Same as math.huge
    expect = '1/0',
}

format_test {
    input  = -1/0,   -- Same as -math.huge
    expect = '-1/0',
}

format_test {
    input  = 0/0,   -- Same as nan
    expect = '0/0',
}

format_test {
    input  = 1/0,       -- Same as math.huge
    options = { math_shorthand = true },
    expect = 'inf',
}

format_test {
    input  = -1/0,       -- Same as -math.huge
    options = { math_shorthand = true },
    expect = '-inf',
}

format_test {
    input  = 0/0,       -- Same as nan
    options = { math_shorthand = true },
    expect = 'nan',
}

--------------------------------------------------------------------------------
-- Primitive types

format_test {
    input  = nil,
    expect = 'nil',
}

format_test {
    input  = true,
    expect = 'true',
}

format_test {
    input  = false,
    expect = 'false',
}

--------------------------------------------------------------------------------
-- 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 = debug.getinfo(1).currentline + 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_pretty.lua\' [Line: '..func_line..']\n\t-- up_values:   { SOME_RANDOM_UPVALUE = false }\n\n\t...\nend'
    }

    local func_line = debug.getinfo(1).currentline + 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_pretty.lua\' [Line: '..func_line..']\n\t-- up_values:   { SOME_RANDOM_UPVALUE = false }\n\n\t...\nend'
    }
end

do
    local func_line = debug.getinfo(1).currentline + 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_pretty.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 = debug.getinfo(1).currentline + 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_pretty.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 {
    longterm = true,
    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
    longterm = true,
    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 = debug.getinfo(1).currentline + 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_pretty.lua\' [Lines: '..func_line..' - '..(func_line+2)..']\n\n\t...\nend',
    }

    local func_line = debug.getinfo(1).currentline + 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_pretty.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',
}

-- 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}',
}

--------------------------------------------------------------------------------
-- Userdata printing

-- TODO. First off figure out a way to test this stuff.
-- Maybe look into using the one available debug.getupvalue(pairs, 1)

--------------------------------------------------------------------------------
-- Thread printing

do
    local suspended_coroutine = coroutine.create(function () end)
    format_test {
        input  = suspended_coroutine,
        approx = true,
        expect = 'suspended coroutine: 0x%x+',
    }
end

do
    local dead_coroutine      = coroutine.create(function () end)
    coroutine.resume(dead_coroutine)
    format_test {
        input  = dead_coroutine,
        approx = true,
        expect = 'dead coroutine: 0x%x+',
    }
end

--------------------------------------------------------------------------------
-- Single-line tables

format_test {
    input  = {},
    expect = '{}',
}

format_test {
    input  = {1, 2, 3},
    expect = '{ 1, 2, 3 }',
}

format_test {
    input  = { 'Hello', 'World' },
    expect = '{ \'Hello\', \'World\' }',
}

format_test {
    input  = { a = 1, b = 2 },
    expect = '{ a = 1, b = 2 }',
}

format_test {
    input  = { __hello = true },
    expect = '{ __hello = true }',
}

format_test {
    input  = { [']]'] = true },
    expect = '{ [\']]\'] = true }',
}

format_test {
    input  = { ['and'] = true },
    expect = '{ [\'and\'] = true }',
}

format_test {
    input  = { [false] = false, [true] = true },
    expect = '{ [false] = false, [true] = true }',
}

format_test {
    input  = { [100] = 'Hi', [300] = 'Hello' },
    expect = '{ [100] = \'Hi\', [300] = \'Hello\' }',
}

format_test { -- Order does not matter
    input  = { b = 1, a = 2 },
    expect = '{ a = 2, b = 1 }',
}

format_test {  -- Can include empty tables
    input  = { {}, {}, {} },
    expect = '{ {}, {}, {} }',
}

format_test {  -- Can include very small tables
    input  = { {1}, {2}, {3} },
    expect = '{ { 1 }, { 2 }, { 3 } }',
}


--------------------------------------------------------------------------------
-- Multi-line tables

format_test {
    input  = { {1, 2, 3}, {4, 5, 6} },
    expect = '{\n\t{ 1, 2, 3 },\n\t{ 4, 5, 6 }\n}',
}

format_test {
    input  = { a = {1, 2, 3}, b = {4, 5, 6} },
    expect = '{\n\ta = { 1, 2, 3 },\n\tb = { 4, 5, 6 }\n}',
}

format_test {
    input  = { 'Hi', [300] = 'Hello' },
    expect = '{\n\t[1]   = \'Hi\',\n\t[300] = \'Hello\'\n}',
}

format_test {
    input  = { { {} } },
    expect = '{\n\t{ {} }\n}',
}

format_test {
    input  = { [{ 1, 2 }] = { 2, 1 } },
    expect = '{\n\t[{ 1, 2 }] = { 2, 1 }\n}',
}

format_test {
    input  = { { {1, 2}, {3, 4} }, {5, 6} },
    expect = '{\n\t{\n\t\t{ 1, 2 },\n\t\t{ 3, 4 }\n\t},\n\t{ 5, 6 }\n}',
}

format_test {
    input   = { { {1, 2}, {3, 4} }, {5, 6} },
    options = { max_depth = 0 },
    expect  = '{...}',
}

format_test {
    input   = { { {1, 2}, {3, 4} }, {5, 6} },
    options = { max_depth = 1 },
    expect  = '{\n\t{...},\n\t{...}\n}',
}

format_test {
    input   = { { {1, 2}, {3, 4} }, {5, 6} },
    options = { max_depth = 2 },
    expect  = '{\n\t{\n\t\t{...},\n\t\t{...}\n\t},\n\t{ 5, 6 }\n}',
}

format_test {
    input   = { { {1, 2}, {3, 4} }, {5, 6} },
    options = { max_depth = 3 },
    expect  = '{\n\t{\n\t\t{ 1, 2 },\n\t\t{ 3, 4 }\n\t},\n\t{ 5, 6 }\n}',
}

format_test {
    input  = { [{ {1,2}, {3,4} }] = 'Hello World' },
    expect = '{\n\t[{...}] = \'Hello World\'\n}',
}

format_test {
    input  = { a = {1,2}, bcdefg = {3,4} },
    expect = '{\n\ta      = { 1, 2 },\n\tbcdefg = { 3, 4 }\n}',
}

format_test {
    input  = { [true] = 1, [1] = false },
    expect = '{\n\t[true] = 1,\n\t[1]    = false\n}',
}

format_test {
    -- Proper indent
    input  = { [1] = 1, ['whatever'] = false },
    expect = '{\n\t[1]          = 1,\n\t[\'whatever\'] = false\n}',
}

format_test {
    -- Table view, with indent.
    input  = { { a = 'hello', b = 'hi' }, { a = 'hi', b = 'hello' } },
    expect = '{\n\t{ a = \'hello\', b = \'hi\'    },\n\t{ a = \'hi\',    b = \'hello\' }\n}',
}

--------------------------------------------------------------------------------
-- CDATA

-- TODO: Add more advanced understanding of cdata.

if type(jit) == 'table' then

    local ffi = require('ffi')
    ffi.cdef[[
        int poll(struct pollfd *fds, unsigned long nfds, int timeout);
    ]]

    format_test {
        input  = ffi.C.poll,
        approx = true,
        expect = 'cdata<.+>: 0x%x+',
    }

    format_test {
        input  = ffi.new('int[10]'),
        approx = true,
        expect = 'cdata<.+>: 0x%x+',
    }
end

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

return SUITE