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More robust super_tostring.

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This commit is contained in:
Jon Michael Aanes 2017-10-22 11:55:05 +02:00
parent 79b036e51e
commit 5e657c6504
2 changed files with 9 additions and 8 deletions
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8
analyze_structure.lua
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@ -42,6 +42,8 @@ local LEAF_VALUE_TYPES = {
local SHORT_STRING_MAX_LEN = 7
local MINIMUM_NUMBER_OF_SET_ELEMENTS = 2
local RECURSIVE_TOSTRING_TIMEOUT = 10
--------------------------------------------------------------------------------
local function is_identifier(s)
@ -226,12 +228,14 @@ local function super_tostring (t)
-- function cannot find a string.
local seen = { [t] = true }
while true do
local nt = tostring(t)
for i = 1, RECURSIVE_TOSTRING_TIMEOUT do
local success, nt = pcall(tostring, t)
if not success then return 'error on tostring: '..tostring(nt) end
if type(nt) == 'string' or nt == nil then return tostring(nt) end
if seen[nt] then return nil end
seen[nt], t = true, nt
end
return nil
end
--------------------------------------------------------------------------------

9
test/test_resilience.lua
View File

@ -161,13 +161,10 @@ end
--------------------------------------------------------------------------------
-- Strange metatable
SUITE:addTest('Metatable: Error on %s operator', function (op)
pretty( setmetatable( { a = 2, b = 4, 1, 2, 3 } , {['__'..op] = function() error 'This should be unreachable!' end}) )
SUITE:addTest('Metatable: Error on operator', function (op)
pretty( setmetatable( { a = 2, b = 4, 1, 2, 3 } , {[op] = function() error 'This should be unreachable!' end}) )
assert(true)
end, { data = {
{'add'}, {'sub'}, {'mul'}, {'div'}, {'mod'},{'pow'}, {'unm'}, {'concat'},
{'len'}, {'eq'}, {'lt'}, {'le'}, {'index'}, {'newindex'}, {'call'} }
})
end, { data = { '__add', '__sub', '__mul', '__div', '__mod', '__pow', '__unm', '__concat','__len', '__eq', '__lt', '__le', '__index', '__newindex', '__call', '__tostring' } })
SUITE:addTest('Metatable: # returns bogus length', function ()
assert_equal('{ 1, 2, 3, 4 }', pretty( setmetatable({ 1, 2, 3, 4 }, {__len = function() return 2 end})))