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112 lines
3.2 KiB
112 lines
3.2 KiB
inspect.lua
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===========
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[](https://travis-ci.org/kikito/inspect.lua)
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This function transform any Lua table into a human-readable representation of that table.
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The objective here is human understanding (i.e. for debugging), not serialization or compactness.
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Examples of use
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===============
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"Array-like" tables are rendered horizontally:
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inspect({1,2,3,4}) == "{ 1, 2, 3, 4 }"
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"dictionary-like" tables are rendered with one element per line:
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inspect({a=1,b=2}) == [[{
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a = 1,
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b = 2
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}]]
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The keys will be sorted alphanumerically when possible.
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"Hybrid" tables will have the array part on the first line, and the dictionary part just below them:
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inspect({1,2,3,b=2,a=1}) == [[{ 1, 2, 3,
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a = 1,
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b = 2
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}]]
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Tables can be nested, and will be indented with two spaces per level.
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inspect({a={b=2}}) == [[{
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a = {
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b = 2
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}
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}]]
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`inspect`'s second parameter allows controlling the maximum depth that will be printed out. When the max depth is reached, it'll just return `{...}`:
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local t5 = {a = {b = {c = {d = {e = 5}}}}}
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inspect(t5, 4) == [[{
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a = {
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b = {
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c = {
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d = {...}
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}
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}
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}
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}]]
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inspect(t5, 2) == [[{
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a = {
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b = {...}
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}
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}]])
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Functions, userdata and threads are simply rendered as `<function x>`, `<userdata x>` and `<thread x>` respectively:
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inspect({ f = print, ud = some_user_data, thread = a_thread} ) == [[{
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f = <function 1>,
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u = <userdata 1>,
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thread = <thread 1>
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}]])
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If the table has a metatable, inspect will include it at the end, in a special field called `<metatable>`:
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inspect(setmetatable({a=1}, {b=2}) == [[{
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a = 1
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<metatable> = {
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b = 2
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}
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}]])
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`inspect` can handle tables with loops inside them. It will print `<id>` right before the table is printed out the first time, and replace the whole table with `<table id>` from then on, preventing infinite loops.
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a = {1, 2}
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b = {3, 4, a}
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a[3] = b -- a references b, and b references a
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inspect(a) = "<1>{ 1, 2, { 3, 4, <table 1> } }"
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Notice that since both `a` appears more than once in the expression, it is prefixed by `<1>` and replaced by `<table 1>` every time it appears later on.
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Gotchas / Warnings
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==================
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This method is *not* appropiate for saving/restoring tables. It is ment to be used by the programmer mainly while debugging a program.
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Installation
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============
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Just copy the inspect.lua file somewhere in your projects (maybe inside a /lib/ folder) and require it accordingly.
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Remember to store the value returned by require somewhere! (I suggest a local variable named inspect, altough others might like table.inspect)
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local inspect = require 'inspect'
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-- or --
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table.inspect = require 'inspect'
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Also, make sure to read the license file; the text of that license file must appear somewhere in your projects' files.
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Specs
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=====
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This project uses [busted](http://olivinelabs.com/busted/) for its specs. If you want to run the specs, you will have to install telescope first. Then just execute the following from the root inspect folder:
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busted
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