-
-
Save chobie/bcff5c74c915422a3075 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
inspect = require("inspect") | |
print(inspect("hello")) |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
local inspect ={ | |
_VERSION = 'inspect.lua 3.0.0', | |
_URL = 'http://github.com/kikito/inspect.lua', | |
_DESCRIPTION = 'human-readable representations of tables', | |
_LICENSE = [[ | |
MIT LICENSE | |
Copyright (c) 2013 Enrique García Cota | |
Permission is hereby granted, free of charge, to any person obtaining a | |
copy of this software and associated documentation files (the | |
"Software"), to deal in the Software without restriction, including | |
without limitation the rights to use, copy, modify, merge, publish, | |
distribute, sublicense, and/or sell copies of the Software, and to | |
permit persons to whom the Software is furnished to do so, subject to | |
the following conditions: | |
The above copyright notice and this permission notice shall be included | |
in all copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. | |
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY | |
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | |
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | |
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
]] | |
} | |
inspect.KEY = setmetatable({}, {__tostring = function() return 'inspect.KEY' end}) | |
inspect.METATABLE = setmetatable({}, {__tostring = function() return 'inspect.METATABLE' end}) | |
-- Apostrophizes the string if it has quotes, but not aphostrophes | |
-- Otherwise, it returns a regular quoted string | |
local function smartQuote(str) | |
if str:match('"') and not str:match("'") then | |
return "'" .. str .. "'" | |
end | |
return '"' .. str:gsub('"', '\\"') .. '"' | |
end | |
local controlCharsTranslation = { | |
["\a"] = "\\a", ["\b"] = "\\b", ["\f"] = "\\f", ["\n"] = "\\n", | |
["\r"] = "\\r", ["\t"] = "\\t", ["\v"] = "\\v" | |
} | |
local function escape(str) | |
local result = str:gsub("\\", "\\\\"):gsub("(%c)", controlCharsTranslation) | |
return result | |
end | |
local function isIdentifier(str) | |
return type(str) == 'string' and str:match( "^[_%a][_%a%d]*$" ) | |
end | |
local function isSequenceKey(k, length) | |
return type(k) == 'number' | |
and 1 <= k | |
and k <= length | |
and math.floor(k) == k | |
end | |
local defaultTypeOrders = { | |
['number'] = 1, ['boolean'] = 2, ['string'] = 3, ['table'] = 4, | |
['function'] = 5, ['userdata'] = 6, ['thread'] = 7 | |
} | |
local function sortKeys(a, b) | |
local ta, tb = type(a), type(b) | |
-- strings and numbers are sorted numerically/alphabetically | |
if ta == tb and (ta == 'string' or ta == 'number') then return a < b end | |
local dta, dtb = defaultTypeOrders[ta], defaultTypeOrders[tb] | |
-- Two default types are compared according to the defaultTypeOrders table | |
if dta and dtb then return defaultTypeOrders[ta] < defaultTypeOrders[tb] | |
elseif dta then return true -- default types before custom ones | |
elseif dtb then return false -- custom types after default ones | |
end | |
-- custom types are sorted out alphabetically | |
return ta < tb | |
end | |
local function getNonSequentialKeys(t) | |
local keys, length = {}, #t | |
for k,_ in pairs(t) do | |
if not isSequenceKey(k, length) then table.insert(keys, k) end | |
end | |
table.sort(keys, sortKeys) | |
return keys | |
end | |
local function getToStringResultSafely(t, mt) | |
local __tostring = type(mt) == 'table' and rawget(mt, '__tostring') | |
local str, ok | |
if type(__tostring) == 'function' then | |
ok, str = pcall(__tostring, t) | |
str = ok and str or 'error: ' .. tostring(str) | |
end | |
if type(str) == 'string' and #str > 0 then return str end | |
end | |
local maxIdsMetaTable = { | |
__index = function(self, typeName) | |
rawset(self, typeName, 0) | |
return 0 | |
end | |
} | |
local idsMetaTable = { | |
__index = function (self, typeName) | |
local col = setmetatable({}, {__mode = "kv"}) | |
rawset(self, typeName, col) | |
return col | |
end | |
} | |
local function countTableAppearances(t, tableAppearances) | |
tableAppearances = tableAppearances or setmetatable({}, {__mode = "k"}) | |
if type(t) == 'table' then | |
if not tableAppearances[t] then | |
tableAppearances[t] = 1 | |
for k,v in pairs(t) do | |
countTableAppearances(k, tableAppearances) | |
countTableAppearances(v, tableAppearances) | |
end | |
countTableAppearances(getmetatable(t), tableAppearances) | |
else | |
tableAppearances[t] = tableAppearances[t] + 1 | |
end | |
end | |
return tableAppearances | |
end | |
local copySequence = function(s) | |
local copy, len = {}, #s | |
for i=1, len do copy[i] = s[i] end | |
return copy, len | |
end | |
local function makePath(path, ...) | |
local keys = {...} | |
local newPath, len = copySequence(path) | |
for i=1, #keys do | |
newPath[len + i] = keys[i] | |
end | |
return newPath | |
end | |
local function processRecursive(process, item, path) | |
if item == nil then return nil end | |
local processed = process(item, path) | |
if type(processed) == 'table' then | |
local processedCopy = {} | |
local processedKey | |
for k,v in pairs(processed) do | |
processedKey = processRecursive(process, k, makePath(path, k, inspect.KEY)) | |
if processedKey ~= nil then | |
processedCopy[processedKey] = processRecursive(process, v, makePath(path, processedKey)) | |
end | |
end | |
local mt = processRecursive(process, getmetatable(processed), makePath(path, inspect.METATABLE)) | |
setmetatable(processedCopy, mt) | |
processed = processedCopy | |
end | |
return processed | |
end | |
------------------------------------------------------------------- | |
local Inspector = {} | |
local Inspector_mt = {__index = Inspector} | |
function Inspector:puts(...) | |
local args = {...} | |
local buffer = self.buffer | |
local len = #buffer | |
for i=1, #args do | |
len = len + 1 | |
buffer[len] = tostring(args[i]) | |
end | |
end | |
function Inspector:down(f) | |
self.level = self.level + 1 | |
f() | |
self.level = self.level - 1 | |
end | |
function Inspector:tabify() | |
self:puts(self.newline, string.rep(self.indent, self.level)) | |
end | |
function Inspector:alreadyVisited(v) | |
return self.ids[type(v)][v] ~= nil | |
end | |
function Inspector:getId(v) | |
local tv = type(v) | |
local id = self.ids[tv][v] | |
if not id then | |
id = self.maxIds[tv] + 1 | |
self.maxIds[tv] = id | |
self.ids[tv][v] = id | |
end | |
return id | |
end | |
function Inspector:putKey(k) | |
if isIdentifier(k) then return self:puts(k) end | |
self:puts("[") | |
self:putValue(k) | |
self:puts("]") | |
end | |
function Inspector:putTable(t) | |
if t == inspect.KEY or t == inspect.METATABLE then | |
self:puts(tostring(t)) | |
elseif self:alreadyVisited(t) then | |
self:puts('<table ', self:getId(t), '>') | |
elseif self.level >= self.depth then | |
self:puts('{...}') | |
else | |
if self.tableAppearances[t] > 1 then self:puts('<', self:getId(t), '>') end | |
local nonSequentialKeys = getNonSequentialKeys(t) | |
local length = #t | |
local mt = getmetatable(t) | |
local toStringResult = getToStringResultSafely(t, mt) | |
self:puts('{') | |
self:down(function() | |
if toStringResult then | |
self:puts(' -- ', escape(toStringResult)) | |
if length >= 1 then self:tabify() end | |
end | |
local count = 0 | |
for i=1, length do | |
if count > 0 then self:puts(',') end | |
self:puts(' ') | |
self:putValue(t[i]) | |
count = count + 1 | |
end | |
for _,k in ipairs(nonSequentialKeys) do | |
if count > 0 then self:puts(',') end | |
self:tabify() | |
self:putKey(k) | |
self:puts(' = ') | |
self:putValue(t[k]) | |
count = count + 1 | |
end | |
if mt then | |
if count > 0 then self:puts(',') end | |
self:tabify() | |
self:puts('<metatable> = ') | |
self:putValue(mt) | |
end | |
end) | |
if #nonSequentialKeys > 0 or mt then -- result is multi-lined. Justify closing } | |
self:tabify() | |
elseif length > 0 then -- array tables have one extra space before closing } | |
self:puts(' ') | |
end | |
self:puts('}') | |
end | |
end | |
function Inspector:putValue(v) | |
local tv = type(v) | |
if tv == 'string' then | |
self:puts(smartQuote(escape(v))) | |
elseif tv == 'number' or tv == 'boolean' or tv == 'nil' then | |
self:puts(tostring(v)) | |
elseif tv == 'table' then | |
self:putTable(v) | |
else | |
self:puts('<',tv,' ',self:getId(v),'>') | |
end | |
end | |
------------------------------------------------------------------- | |
function inspect.inspect(root, options) | |
options = options or {} | |
local depth = options.depth or math.huge | |
local newline = options.newline or '\n' | |
local indent = options.indent or ' ' | |
local process = options.process | |
if process then | |
root = processRecursive(process, root, {}) | |
end | |
local inspector = setmetatable({ | |
depth = depth, | |
buffer = {}, | |
level = 0, | |
ids = setmetatable({}, idsMetaTable), | |
maxIds = setmetatable({}, maxIdsMetaTable), | |
newline = newline, | |
indent = indent, | |
tableAppearances = countTableAppearances(root) | |
}, Inspector_mt) | |
inspector:putValue(root) | |
return table.concat(inspector.buffer) | |
end | |
setmetatable(inspect, { __call = function(_, ...) return inspect.inspect(...) end }) | |
return inspect |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
macbook% ../bin/glua bug.lua
inspect.lua:300: attempt to index a non-table object(nil)
stack traceback:
inspect.lua:300: in inspect.lua:297
(tailcall): ?
bug.lua:2: in main chunk
[G]: ?
macbook% lua bug.lua
"hello"