mirror of
https://github.com/kikito/inspect.lua.git
synced 2024-12-15 14:34:21 +00:00
350 lines
9.6 KiB
Lua
350 lines
9.6 KiB
Lua
local inspect ={
|
|
_VERSION = 'inspect.lua 3.0.3',
|
|
_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, sequenceLength)
|
|
return type(k) == 'number'
|
|
and 1 <= k
|
|
and k <= sequenceLength
|
|
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
|
|
|
|
-- For implementation reasons, the behavior of rawlen & # is "undefined" when
|
|
-- tables aren't pure sequences. So we implement our own # operator.
|
|
local function getSequenceLength(t)
|
|
local len = 1
|
|
local v = rawget(t,len)
|
|
while v ~= nil do
|
|
len = len + 1
|
|
v = rawget(t,len)
|
|
end
|
|
return len - 1
|
|
end
|
|
|
|
local function getNonSequentialKeys(t)
|
|
local keys = {}
|
|
local sequenceLength = getSequenceLength(t)
|
|
for k,_ in pairs(t) do
|
|
if not isSequenceKey(k, sequenceLength) then table.insert(keys, k) end
|
|
end
|
|
table.sort(keys, sortKeys)
|
|
return keys, sequenceLength
|
|
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 = {}
|
|
rawset(self, typeName, col)
|
|
return col
|
|
end
|
|
}
|
|
|
|
local function countTableAppearances(t, tableAppearances)
|
|
tableAppearances = tableAppearances or {}
|
|
|
|
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)
|
|
local visited = {}
|
|
|
|
local function processRecursive2(item2, path2)
|
|
if item2 == nil then return nil end
|
|
if visited[item2] then return visited[item2] end
|
|
|
|
local processed = process(item2, path2)
|
|
if type(processed) == 'table' then
|
|
local processedCopy = {}
|
|
visited[item2] = processedCopy
|
|
local processedKey
|
|
|
|
for k,v in pairs(processed) do
|
|
processedKey = processRecursive2(k, makePath(path2, k, inspect.KEY))
|
|
if processedKey ~= nil then
|
|
processedCopy[processedKey] = processRecursive2(v, makePath(path2, processedKey))
|
|
end
|
|
end
|
|
|
|
local mt = processRecursive2(getmetatable(processed), makePath(path2, inspect.METATABLE))
|
|
setmetatable(processedCopy, mt)
|
|
processed = processedCopy
|
|
end
|
|
return processed
|
|
end
|
|
|
|
return processRecursive2(item, path)
|
|
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, sequenceLength = getNonSequentialKeys(t)
|
|
local mt = getmetatable(t)
|
|
local toStringResult = getToStringResultSafely(t, mt)
|
|
|
|
self:puts('{')
|
|
self:down(function()
|
|
if toStringResult then
|
|
self:puts(' -- ', escape(toStringResult))
|
|
if sequenceLength >= 1 then self:tabify() end
|
|
end
|
|
|
|
local count = 0
|
|
for i=1, sequenceLength 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 sequenceLength > 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
|
|
|