1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
--[[
Author: Julio Manuel Fernandez-Diaz
Date: January 12, 2007
(For Lua 5.1)
Modified slightly by RiciLake to avoid the unnecessary table traversal in tablecount()
Formats tables with cycles recursively to any depth.
The output is returned as a string.
References to other tables are shown as values.
Self references are indicated.
The string returned is "Lua code", which can be procesed
(in the case in which indent is composed by spaces or "--").
Userdata and function keys and values are shown as strings,
which logically are exactly not equivalent to the original code.
This routine can serve for pretty formating tables with
proper indentations, apart from printing them:
print(table.show(t, "t")) -- a typical use
Heavily based on "Saving tables with cycles", PIL2, p. 113.
Arguments:
t is the table.
name is the name of the table (optional)
indent is a first indentation (optional).
--]]
local debug = require('debug')
local dbg_getfenv = debug.getfenv or debug.getuservalue
function table.show(t, name, indent)
local cart -- a container
local autoref -- for self references
--[[ counts the number of elements in a table
local function tablecount(t)
local n = 0
for _, _ in pairs(t) do n = n+1 end
return n
end
]]
-- (RiciLake) returns true if the table is empty
local function isemptytable(t) return type(t) == "table" and next(t) == nil end
local function basicSerialize (o)
local so = tostring(o)
if type(o) == "function" then
local info = debug.getinfo(o, "S")
-- info.name is nil because o is not a calling level
if info.what == "C" then
return string.format("%q", so .. ", C function")
else
-- the information is defined through lines
return string.format("%q", so .. ", defined in (" ..
info.linedefined .. "-" .. info.lastlinedefined ..
")" .. info.source)
end
elseif type(o) == "number" or type(o) == "boolean" then
return so
else
return string.format("%q", so)
end
end
local function addtocart (value, name, indent, saved, field)
indent = indent or ""
saved = saved or {}
field = field or name
cart = cart .. indent .. field
if type(value) == "table" then
if saved[value] then
cart = cart .. " = {}; -- " .. saved[value] .. " (self reference)\n"
autoref = autoref .. name .. " = " .. saved[value] .. ";\n"
else
saved[value] = name
--if tablecount(value) == 0 then
if isemptytable(value) then
cart = cart .. " = {};\n"
else
cart = cart .. " = {\n"
for k, v in pairs(value) do
k = basicSerialize(k)
local fname = string.format("%s[%s]", name, k)
field = string.format("[%s]", k)
-- three spaces between levels
addtocart(v, fname, indent .. " ", saved, field)
end
for k, v in pairs{env = dbg_getfenv(value), mt = debug.getmetatable(value)} do
k = basicSerialize(k)
local fname = string.format("%s[%s]", name, k)
field = string.format("[%s]", k)
-- three spaces between levels
addtocart(v, fname, indent .. " ", saved, field)
end
cart = cart .. indent .. "};\n"
end
end
elseif type(value) == "userdata" then
if saved[value] then
cart = cart .. " = " .. basicSerialize(value) .. "; -- " .. saved[value] .. " (self reference)\n"
autoref = autoref .. name .. " = " .. saved[value] .. ";\n"
else
saved[value] = name
cart = cart .. " = " .. basicSerialize(value) .. " {\n"
for k, v in pairs{env = dbg_getfenv(value), mt = debug.getmetatable(value)} do
k = basicSerialize(k)
local fname = string.format("%s[%s]", name, k)
field = string.format("[%s]", k)
-- three spaces between levels
addtocart(v, fname, indent .. " ", saved, field)
end
cart = cart .. indent .. "};\n"
end
elseif type(value) == "function" then
cart = cart .. " = " .. basicSerialize(value)
if debug.getupvalue(value, 1) == nil then
cart = cart .. ";\n"
else
cart = cart .. " {\n"
local i = 1
while true do
local k, v = debug.getupvalue(value, i)
if k == nil and v == nil then break end
k = basicSerialize(i)
local fname = string.format("%s[%s]", name, k)
field = string.format("[%s]", k)
-- three spaces between levels
addtocart(v, fname, indent .. " ", saved, field)
i = i + 1
end
cart = cart .. indent .. "};\n"
end
else
cart = cart .. " = " .. basicSerialize(value) .. ";\n"
end
end
name = name or "__unnamed__"
if type(t) ~= "table" and type(t) ~= 'userdata' then
return name .. " = " .. basicSerialize(t)
end
cart, autoref = "", ""
addtocart(t, name, indent)
return cart .. autoref
end
|
