335 lines
9.3 KiB
Lua
335 lines
9.3 KiB
Lua
local inspect ={
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_VERSION = 'inspect.lua 3.1.0',
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_URL = 'http://github.com/kikito/inspect.lua',
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_DESCRIPTION = 'human-readable representations of tables',
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_LICENSE = [[
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MIT LICENSE
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Copyright (c) 2013 Enrique García Cota
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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]]
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}
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local tostring = tostring
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inspect.KEY = setmetatable({}, {__tostring = function() return 'inspect.KEY' end})
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inspect.METATABLE = setmetatable({}, {__tostring = function() return 'inspect.METATABLE' end})
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local function rawpairs(t)
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return next, t, nil
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end
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-- Apostrophizes the string if it has quotes, but not aphostrophes
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-- Otherwise, it returns a regular quoted string
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local function smartQuote(str)
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if str:match('"') and not str:match("'") then
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return "'" .. str .. "'"
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end
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return '"' .. str:gsub('"', '\\"') .. '"'
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end
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-- \a => '\\a', \0 => '\\0', 31 => '\31'
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local shortControlCharEscapes = {
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["\a"] = "\\a", ["\b"] = "\\b", ["\f"] = "\\f", ["\n"] = "\\n",
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["\r"] = "\\r", ["\t"] = "\\t", ["\v"] = "\\v"
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}
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local longControlCharEscapes = {} -- \a => nil, \0 => \000, 31 => \031
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for i=0, 31 do
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local ch = string.char(i)
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if not shortControlCharEscapes[ch] then
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shortControlCharEscapes[ch] = "\\"..i
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longControlCharEscapes[ch] = string.format("\\%03d", i)
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end
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end
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local function escape(str)
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return (str:gsub("\\", "\\\\")
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:gsub("(%c)%f[0-9]", longControlCharEscapes)
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:gsub("%c", shortControlCharEscapes))
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end
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local function isIdentifier(str)
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return type(str) == 'string' and str:match( "^[_%a][_%a%d]*$" )
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end
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local function isSequenceKey(k, sequenceLength)
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return type(k) == 'number'
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and 1 <= k
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and k <= sequenceLength
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and math.floor(k) == k
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end
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local defaultTypeOrders = {
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['number'] = 1, ['boolean'] = 2, ['string'] = 3, ['table'] = 4,
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['function'] = 5, ['userdata'] = 6, ['thread'] = 7
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}
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local function sortKeys(a, b)
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local ta, tb = type(a), type(b)
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-- strings and numbers are sorted numerically/alphabetically
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if ta == tb and (ta == 'string' or ta == 'number') then return a < b end
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local dta, dtb = defaultTypeOrders[ta], defaultTypeOrders[tb]
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-- Two default types are compared according to the defaultTypeOrders table
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if dta and dtb then return defaultTypeOrders[ta] < defaultTypeOrders[tb]
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elseif dta then return true -- default types before custom ones
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elseif dtb then return false -- custom types after default ones
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end
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-- custom types are sorted out alphabetically
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return ta < tb
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end
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-- For implementation reasons, the behavior of rawlen & # is "undefined" when
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-- tables aren't pure sequences. So we implement our own # operator.
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local function getSequenceLength(t)
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local len = 1
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local v = rawget(t,len)
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while v ~= nil do
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len = len + 1
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v = rawget(t,len)
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end
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return len - 1
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end
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local function getNonSequentialKeys(t)
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local keys, keysLength = {}, 0
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local sequenceLength = getSequenceLength(t)
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for k,_ in rawpairs(t) do
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if not isSequenceKey(k, sequenceLength) then
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keysLength = keysLength + 1
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keys[keysLength] = k
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end
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end
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table.sort(keys, sortKeys)
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return keys, keysLength, sequenceLength
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end
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local function countTableAppearances(t, tableAppearances)
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tableAppearances = tableAppearances or {}
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if type(t) == 'table' then
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if not tableAppearances[t] then
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tableAppearances[t] = 1
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for k,v in rawpairs(t) do
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countTableAppearances(k, tableAppearances)
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countTableAppearances(v, tableAppearances)
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end
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countTableAppearances(getmetatable(t), tableAppearances)
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else
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tableAppearances[t] = tableAppearances[t] + 1
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end
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end
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return tableAppearances
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end
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local copySequence = function(s)
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local copy, len = {}, #s
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for i=1, len do copy[i] = s[i] end
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return copy, len
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end
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local function makePath(path, ...)
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local keys = {...}
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local newPath, len = copySequence(path)
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for i=1, #keys do
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newPath[len + i] = keys[i]
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end
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return newPath
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end
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local function processRecursive(process, item, path, visited)
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if item == nil then return nil end
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if visited[item] then return visited[item] end
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local processed = process(item, path)
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if type(processed) == 'table' then
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local processedCopy = {}
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visited[item] = processedCopy
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local processedKey
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for k,v in rawpairs(processed) do
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processedKey = processRecursive(process, k, makePath(path, k, inspect.KEY), visited)
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if processedKey ~= nil then
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processedCopy[processedKey] = processRecursive(process, v, makePath(path, processedKey), visited)
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end
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end
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local mt = processRecursive(process, getmetatable(processed), makePath(path, inspect.METATABLE), visited)
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if type(mt) ~= 'table' then mt = nil end -- ignore not nil/table __metatable field
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setmetatable(processedCopy, mt)
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processed = processedCopy
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end
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return processed
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end
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-------------------------------------------------------------------
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local Inspector = {}
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local Inspector_mt = {__index = Inspector}
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function Inspector:puts(...)
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local args = {...}
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local buffer = self.buffer
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local len = #buffer
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for i=1, #args do
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len = len + 1
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buffer[len] = args[i]
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end
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end
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function Inspector:down(f)
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self.level = self.level + 1
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f()
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self.level = self.level - 1
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end
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function Inspector:tabify()
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self:puts(self.newline, string.rep(self.indent, self.level))
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end
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function Inspector:alreadyVisited(v)
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return self.ids[v] ~= nil
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end
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function Inspector:getId(v)
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local id = self.ids[v]
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if not id then
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local tv = type(v)
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id = (self.maxIds[tv] or 0) + 1
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self.maxIds[tv] = id
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self.ids[v] = id
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end
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return tostring(id)
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end
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function Inspector:putKey(k)
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if isIdentifier(k) then return self:puts(k) end
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self:puts("[")
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self:putValue(k)
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self:puts("]")
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end
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function Inspector:putTable(t)
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if t == inspect.KEY or t == inspect.METATABLE then
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self:puts(tostring(t))
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elseif self:alreadyVisited(t) then
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self:puts('<table ', self:getId(t), '>')
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elseif self.level >= self.depth then
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self:puts('{...}')
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else
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if self.tableAppearances[t] > 1 then self:puts('<', self:getId(t), '>') end
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local nonSequentialKeys, nonSequentialKeysLength, sequenceLength = getNonSequentialKeys(t)
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local mt = getmetatable(t)
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self:puts('{')
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self:down(function()
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local count = 0
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for i=1, sequenceLength do
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if count > 0 then self:puts(',') end
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self:puts(' ')
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self:putValue(t[i])
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count = count + 1
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end
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for i=1, nonSequentialKeysLength do
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local k = nonSequentialKeys[i]
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if count > 0 then self:puts(',') end
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self:tabify()
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self:putKey(k)
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self:puts(' = ')
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self:putValue(t[k])
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count = count + 1
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end
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if type(mt) == 'table' then
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if count > 0 then self:puts(',') end
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self:tabify()
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self:puts('<metatable> = ')
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self:putValue(mt)
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end
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end)
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if nonSequentialKeysLength > 0 or type(mt) == 'table' then -- result is multi-lined. Justify closing }
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self:tabify()
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elseif sequenceLength > 0 then -- array tables have one extra space before closing }
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self:puts(' ')
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end
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self:puts('}')
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end
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end
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function Inspector:putValue(v)
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local tv = type(v)
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if tv == 'string' then
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self:puts(smartQuote(escape(v)))
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elseif tv == 'number' or tv == 'boolean' or tv == 'nil' or
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tv == 'cdata' or tv == 'ctype' then
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self:puts(tostring(v))
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elseif tv == 'table' then
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self:putTable(v)
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else
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self:puts('<', tv, ' ', self:getId(v), '>')
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end
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end
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-------------------------------------------------------------------
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function inspect.inspect(root, options)
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options = options or {}
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local depth = options.depth or math.huge
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local newline = options.newline or '\n'
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local indent = options.indent or ' '
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local process = options.process
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if process then
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root = processRecursive(process, root, {}, {})
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end
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local inspector = setmetatable({
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depth = depth,
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level = 0,
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buffer = {},
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ids = {},
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maxIds = {},
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newline = newline,
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indent = indent,
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tableAppearances = countTableAppearances(root)
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}, Inspector_mt)
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inspector:putValue(root)
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return table.concat(inspector.buffer)
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end
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setmetatable(inspect, { __call = function(_, ...) return inspect.inspect(...) end })
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return inspect
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