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util/debug.lua @ 4539:3cbfa768eb06
moduleapi: Add module:shared(), a way to easily share data between multiple loaded modules
author | Matthew Wild <mwild1@gmail.com> |
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date | Sun, 22 Jan 2012 19:48:53 +0000 |
parent | 4465:41c4252526bd |
child | 4519:510f4ba7080f |
child | 4680:8834f220ab91 |
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-- 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) level = level + 1; -- Skip this function itself 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 = {}; if func then 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 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