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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
-- Variables ending with these names will not
-- have their values printed ('password' includes
-- 'new_password', etc.)
--
-- luacheck: ignore 122/debug
local censored_names = {
password = true;
passwd = true;
pass = true;
pwd = true;
};
local optimal_line_length = 65;
local termcolours = require "util.termcolours";
local getstring = termcolours.getstring;
local styles;
do
local _ = termcolours.getstyle;
styles = {
boundary_padding = _("bright");
filename = _("bright", "blue");
level_num = _("green");
funcname = _("yellow");
location = _("yellow");
};
end
local function get_locals_table(thread, level)
local locals = {};
for local_num = 1, math.huge do
local name, value;
if thread then
name, value = debug.getlocal(thread, level, local_num);
else
name, value = debug.getlocal(level+1, local_num);
end
if not name then break; end
table.insert(locals, { name = name, value = value });
end
return locals;
end
local function get_upvalues_table(func)
local upvalues = {};
if func then
for upvalue_num = 1, math.huge do
local name, value = debug.getupvalue(func, upvalue_num);
if not name then break; end
if name == "" then name = ("[%d]"):format(upvalue_num); end
table.insert(upvalues, { name = name, value = value });
end
end
return upvalues;
end
local function string_from_var_table(var_table, max_line_len, indent_str)
local var_string = {};
local col_pos = 0;
max_line_len = max_line_len or math.huge;
indent_str = "\n"..(indent_str or "");
for _, var in ipairs(var_table) do
local name, value = var.name, var.value;
if name:sub(1,1) ~= "(" then
if type(value) == "string" then
if censored_names[name:match("%a+$")] then
value = "<hidden>";
else
value = ("%q"):format(value);
end
else
value = tostring(value);
end
if #value > max_line_len then
value = value:sub(1, max_line_len-3).."…";
end
local str = ("%s = %s"):format(name, tostring(value));
col_pos = col_pos + #str;
if col_pos > max_line_len then
table.insert(var_string, indent_str);
col_pos = 0;
end
table.insert(var_string, str);
end
end
if #var_string == 0 then
return nil;
else
return "{ "..table.concat(var_string, ", "):gsub(indent_str..", ", indent_str).." }";
end
end
local function get_traceback_table(thread, start_level)
local levels = {};
for level = start_level, math.huge do
local info;
if thread then
info = debug.getinfo(thread, level);
else
info = debug.getinfo(level+1);
end
if not info then break; end
levels[(level-start_level)+1] = {
level = level;
info = info;
locals = get_locals_table(thread, level+(thread and 0 or 1));
upvalues = get_upvalues_table(info.func);
};
end
return levels;
end
local function build_source_boundary_marker(last_source_desc)
local padding = string.rep("-", math.floor(((optimal_line_length - 6) - #last_source_desc)/2));
return getstring(styles.boundary_padding, "v"..padding).." "..
getstring(styles.filename, last_source_desc).." "..
getstring(styles.boundary_padding, padding..(#last_source_desc%2==0 and "-v" or "v "));
end
local function _traceback(thread, message, level)
-- Lua manual says: debug.traceback ([thread,] [message [, level]])
-- I fathom this to mean one of:
-- ()
-- (thread)
-- (message, level)
-- (thread, message, level)
if thread == nil then -- Defaults
thread, message, level = coroutine.running(), message, level;
elseif type(thread) == "string" then
thread, message, level = coroutine.running(), thread, message;
elseif type(thread) ~= "thread" then
return nil; -- debug.traceback() does this
end
level = level or 0;
message = message and (message.."\n") or "";
-- +3 counts for this function, and the pcall() and wrapper above us, the +1... I don't know.
local levels = get_traceback_table(thread, level+(thread == nil and 4 or 0));
local last_source_desc;
local lines = {};
for nlevel, current_level in ipairs(levels) do
local info = current_level.info;
local line;
local func_type = info.namewhat.." ";
local source_desc = (info.short_src == "[C]" and "C code") or info.short_src or "Unknown";
if func_type == " " then func_type = ""; end;
if info.short_src == "[C]" then
line = "[ C ] "..func_type.."C function "..getstring(styles.location, (info.name and ("%q"):format(info.name) or "(unknown name)"));
elseif info.what == "main" then
line = "[Lua] "..getstring(styles.location, info.short_src.." line "..info.currentline);
else
local name = info.name or " ";
if name ~= " " then
name = ("%q"):format(name);
end
if func_type == "global " or func_type == "local " then
func_type = func_type.."function ";
end
line = "[Lua] "..getstring(styles.location, info.short_src.." line "..
info.currentline).." in "..func_type..getstring(styles.funcname, name)..
" (defined on line "..info.linedefined..")";
end
if source_desc ~= last_source_desc then -- Venturing into a new source, add marker for previous
last_source_desc = source_desc;
table.insert(lines, "\t "..build_source_boundary_marker(last_source_desc));
end
nlevel = nlevel-1;
table.insert(lines, "\t"..(nlevel==0 and ">" or " ")..getstring(styles.level_num, "("..nlevel..") ")..line);
local npadding = (" "):rep(#tostring(nlevel));
if current_level.locals then
local locals_str = string_from_var_table(current_level.locals, optimal_line_length, "\t "..npadding);
if locals_str then
table.insert(lines, "\t "..npadding.."Locals: "..locals_str);
end
end
local upvalues_str = string_from_var_table(current_level.upvalues, optimal_line_length, "\t "..npadding);
if upvalues_str then
table.insert(lines, "\t "..npadding.."Upvals: "..upvalues_str);
end
end
-- table.insert(lines, "\t "..build_source_boundary_marker(last_source_desc));
return message.."stack traceback:\n"..table.concat(lines, "\n");
end
local function traceback(...)
local ok, ret = pcall(_traceback, ...);
if not ok then
return "Error in error handling: "..ret;
end
return ret;
end
local function use()
debug.traceback = traceback;
end
return {
get_locals_table = get_locals_table;
get_upvalues_table = get_upvalues_table;
string_from_var_table = string_from_var_table;
get_traceback_table = get_traceback_table;
traceback = traceback;
use = use;
};
|
