pretty/test/test_pretty.lua

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

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

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

-- Compat
if not loadstring then  loadstring = load  end                        -- Lua 5.3 compat
local HAS_ADV_GETLOCAL  =  not not debug.getinfo(1, 'u').nparams      -- Lua 5.1 compat
local HAS_UNICODE_IDEN  =  not not loadstring 'local ϕ = 1; return ϕ' -- Lua 5.1 compat
local HAS_JIT_LIBRARY   =  type(rawget(_G, 'jit')) == 'table'         -- Non-LuaJIT 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 actual_result    =  format(t.input, t.options)
        if not t.approx or type(actual_result) ~= 'string' then
            assert_equal(t.expect, actual_result)
        else
            if not actual_result:match(t.expect) then
                error(ASSERT_ERROR_APPROX:format(t.expect, actual_result))
            end
        end
    end, { line = debug.getinfo(2).currentline })
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\'',
}

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

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

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

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

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

-- TODO: Figure out a way to print userdata.
-- 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 { -- 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 = '{ { 1, 2, 3 }, { 4, 5, 6 } }',
}

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

format_test {
    name = 'Unicode characters can be used as string keys in tables',
    input  = { ['a'] = 1, ['ψ'] = 2 },
    expect = '{ a = 1, ψ = 2 }',
}

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

format_test {
    input  = { 'Hi', [300] = 'Hello' },
    expect = '{ [1] = \'Hi\', [300] = \'Hello\' }',
}

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

format_test {
    input  = { [{ 1, 2 }] = { 2, 1 } },
    expect = '{ [{ 1, 2 }] = { 2, 1 } }',
}

format_test {
    input  = { { {1, 2}, {3, 4} }, {5, 6} },
    expect  = '{ { { 1, 2 }, { 3, 4 } }, { 5, 6 } }',
}

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  = '{ {...}, {...} }',
}

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

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

format_test {
    input  = { [{ {1,2}, {3,4} }] = 'Hello World' },
    expect = '{ [{...}] = \'Hello World\' }',
}

format_test {
    input  = { a = {1,2}, bcdefg = {3,4} },
    expect = '{ a = { 1, 2 }, bcdefg = { 3, 4 } }',
}

format_test {
    input  = { [true] = 1, [1] = false },
    expect = '{ [1] = false, [true] = 1 }',
}

format_test {
    -- Proper indent
    input  = { [1] = 1, ['whatever'] = false },
    expect = '{ [1] = 1, [\'whatever\'] = false }',
}

format_test {
    -- Table view, with indent.
    input  = { { a = 'hello', b = 'hi' }, { a = 'hi', b = 'hello' } },
    expect = '{\n    { a = \'hello\', b = \'hi\'    },\n    { a = \'hi\',    b = \'hello\' }\n}',
}

format_test {
    name = 'Proper alignment when using unicode characters as keys',
    input  = {
        ['djævle'] = 'dyr?',
        ['europa'] = 'måne',
        ['øå']     = 'en å på en ø?',
    },
    expect = '{\n    djævle = \'dyr?\',\n    europa = \'måne\',\n    øå     = \'en å på en ø?\'\n}',
}

--------------------------------------------------------------------------------
-- Table recursion

do
    local recursive = {}
          recursive[1] = recursive
    format_test {
        input   = recursive,
        options = { max_depth = 5 },
        expect  = '{ {...} }',
    }
    format_test {
      input   = recursive,
      options = { max_depth = 5, recursion = 'ignore' },
      expect  = '{ {...} }',
    }
    format_test {
      input   = recursive,
      options = { max_depth = 5, recursion = 'marked' },
      expect  = '<1>{ <1>{...} }',
    }
end

do
    local a = {}
    local b = { a }
          a[1] = b
    local rec = { a = a, b = b }
    format_test {
        name    = 'Top layers should be expanded, rather than lower layers.',
        input   = rec,
        options = { max_depth = 5 },
        expect  = '{\n    a = { {...} },\n    b = { {...} }\n}',
    }
end

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

-- TODO: Add more advanced understanding of cdata.

if HAS_JIT_LIBRARY 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

--------------------------------------------------------------------------------
-- General

SUITE:addTest('UseCase: Can print _G with max_depth = 1', function ()
    format(_G, {max_depth = 1})
    assert(true)
end)

SUITE:addTest('UseCase: Can load function from file that is shortly deleted', function ()
    local module_name = 'tmp_'..os.time()
    -- Create module
    local file = io.open('./'..module_name..'.lua', 'w')
          file:write '\nlocal function yo ()\n    -- Hello World\n    return math.random()\nend\n\nreturn yo\n'
          file:close()
    -- Load module
    local yo = require(module_name)
    -- Remove module
    os.remove('./'..module_name..'.lua')
    package.loaded[module_name] = nil

    -- Format the function, even though the module it came from is gone.
    format(yo)
    assert(true)
end)

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

return SUITE