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-rw-r--r--util/debug.lua135
1 files changed, 135 insertions, 0 deletions
diff --git a/util/debug.lua b/util/debug.lua
new file mode 100644
index 00000000..0f0e24c0
--- /dev/null
+++ b/util/debug.lua
@@ -0,0 +1,135 @@
+-- Variables ending with these names will not
+-- have their values printed ('password' includes
+-- 'new_password', etc.)
+local censored_names = {
+ password = true;
+ passwd = true;
+ pass = true;
+ pwd = true;
+};
+
+local function get_locals_table(level)
+ local locals = {};
+ for local_num = 1, math.huge do
+ local name, value = debug.getlocal(level, local_num);
+ 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 = {};
+ for upvalue_num = 1, math.huge do
+ local name, value = debug.getupvalue(func, upvalue_num);
+ if not name then break; end
+ table.insert(upvalues, { name = name, value = value });
+ 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
+
+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);
+ end
+ if not info then break; end
+
+ levels[(level-start_level)+1] = {
+ level = level;
+ info = info;
+ locals = get_locals_table(level);
+ upvalues = get_upvalues_table(info.func);
+ };
+ end
+ return levels;
+end
+
+function debug.traceback(thread, message, level)
+ if type(thread) ~= "thread" then
+ thread, message, level = coroutine.running(), thread, message;
+ end
+ if level and type(message) ~= "string" then
+ return nil, "invalid message";
+ elseif not level then
+ level = message or 2;
+ end
+
+ message = message and (message.."\n") or "";
+
+ local levels = get_traceback_table(thread, level+2);
+
+ local lines = {};
+ for nlevel, level in ipairs(levels) do
+ local info = level.info;
+ local line = "...";
+ local func_type = info.namewhat.." ";
+ if func_type == " " then func_type = ""; end;
+ if info.short_src == "[C]" then
+ line = "[ C ] "..func_type.."C function "..(info.name and ("%q"):format(info.name) or "(unknown name)")
+ elseif info.what == "main" then
+ line = "[Lua] "..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] "..info.short_src.." line "..info.currentline.." in "..func_type..name.." defined on line "..info.linedefined;
+ end
+ nlevel = nlevel-1;
+ table.insert(lines, "\t"..(nlevel==0 and ">" or " ").."("..nlevel..") "..line);
+ local npadding = (" "):rep(#tostring(nlevel));
+ local locals_str = string_from_var_table(level.locals, 65, "\t "..npadding);
+ if locals_str then
+ table.insert(lines, "\t "..npadding.."Locals: "..locals_str);
+ end
+ local upvalues_str = string_from_var_table(level.upvalues, 65, "\t "..npadding);
+ if upvalues_str then
+ table.insert(lines, "\t "..npadding.."Upvals: "..upvalues_str);
+ end
+ end
+ return message.."stack traceback:\n"..table.concat(lines, "\n");
+end