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Module:debug

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This module is used to debug templates and other modules, and to help track down problems or incorrect usage.

dump

[baguhin]

dump(value)

Converts any value (except for functions) into a string representation. The string is formatted as Lua syntax, so you should be able to take the output of this function and insert it back into a Lua module. Tables are processed recursively. Tabs are converted into spaces.

highlight_dump

[baguhin]

highlight_dump(value)

Does the same as dump, except it adds Lua syntax highlighting, and tabs are preserved.

error

[baguhin]

{{[[Template:#invoke:debug|#invoke:debug]]|error|message}}

This function is invoked from templates, and simply triggers a script error with a message. This is useful if you want to trigger a script error but don't have the time or knowledge to convert a template to Lua.

track

[baguhin]

track(key)

Convenience function which transcludes a tracking subtemplate. The key is a string or a list of strings: track("key") or track{ "key1", "key2", "key3", ... }.

Usually invocations of this functions should look like this: require('Module:debug/track')(key) or require('Module:debug').track(key). Loading this module on the spot instead of ahead of time may prevent unnecessary transclusion list overload.

highlight

[baguhin]

This function creates the equivalent of a <source> or <syntaxhighlight> tag using the frame:extensionTag() function from Scribunto. Depending on the arguments, it behaves in two different ways:

highlight(content, options)
Highlight the given content (which should be a string) using the table of options. 
require("Module:debug").highlight('<span class="Latn" lang="en">word</span>', { lang = "html" }) -- generate syntax-highlighted HTML code
highlight(options)
Returns a highlighting function that uses the given table of options. This is useful when a given set of options are used multiple times in a module. The highlighting function receives a string as argument.
local highlight_HTML = require("Module:debug").highlight{ lang = "html" } -- generate syntax-highlighting function for HTML
highlight_HTML('<span class="Latn" lang="en">word</span>') -- generates syntax-highlighted HTML code

The function recognizes two fields in the table of options:

lang
Language or file format. (See the full list.) Defaults to "lua".
inline
Display the code inline, rather than as a block.
local export = {}

local escape
do
	local escapes = {
		["\a"] = "a", ["\b"] = "b", ["\f"] = "f", ["\n"] = "n", ["\r"] = "r",
		["\t"] = "t", ["\v"] = "v", ["\\"] = "\\", ["\""] = '"', ["'"] = "'",
	}
	
	local function helper(char)
		return escapes[char] and "\\" .. escapes[char]
			or ("\\%03d"):format(char:byte())
	end
	
	-- Escape control characters, backslash, double quote, and bytes that aren't
	-- used in UTF-8.
	-- Escape stuff that can't be saved in a MediaWiki page, like invalid UTF-8
	-- and NFD character sequences? Hard.
	-- Similar to string.format("%q", str), which does not use C-like simple
	-- escapes and does not escape bytes that are not used in UTF-8.
	escape = function (str)
		return (str:gsub("[%c\\\"\192\193\245-\255]", helper))
	end
end

export.escape = escape

-- Convert a value to a string
function export.dump(value, prefix, tsort)
	local t = type(value)
	
	prefix = prefix or ""
	
	if t == "string" then
		return '"' .. escape(value) .. '"'
	elseif t == "table" then
		local str_table = {}
		
		table.insert(str_table, " {")
		
		for key, val in require("Module:table").sortedPairs(value, tsort) do
			table.insert(str_table, " " .. prefix .. "\t[" .. export.dump(key, prefix .. "\t") .. "] = " .. export.dump(val, prefix .. "\t"):gsub("^ ", "") .. ",")
		end
		
		table.insert(str_table, " " .. prefix .. "}")
		
		return table.concat(str_table, "\n")
	else
		return tostring(value)
	end
end


function export.highlight_dump(value, prefix, tsort, options)
	options = options or {}
	
	local func = options.modified and "modified_dump" or "dump"
	
	local dump = export[func](value, prefix, tsort)
	
	-- Remove spaces at beginnings of lines (which are simply to force a <pre></pre> tag).
	dump = dump:gsub("%f[^%z\n] ", "")
	
	return export.highlight(dump)
end


-- Returns true if table contains a table as one of its values
local function containsTable(t)
	for key, value in pairs(t) do
		if type(value) == "table" then
			return true
		end
	end
	return false
end


local function containsTablesWithSize(t, size)
	for key, value in pairs(t) do
		if type(value) == "table" and require("Module:table").size(value) ~= size then
			return false
		end
	end
	return true
end	


--[=[
	Convert a value to a string.
	Like dump below, but if a table has consecutive numbered keys and does not
	have a table as one of its values, it will be placed on a single line.
	Used by [[Module:User:Erutuon/script recognition]].
]=]
function export.modified_dump(value, prefix, tsort)
	local t = type(value)
	
	prefix = prefix or ""
	
	if t == "string" then
		return '"' .. value .. '"'
	elseif t == "table" then
		local str_table = {}
		
		local containsTable = containsTable(value)
		local consecutive = require("Module:table").isArray(value)
		if consecutive and not containsTable or containsTable and containsTablesWithSize(value, 3) then
			table.insert(str_table, "{")
			
			for key, val in require("Module:table").sortedPairs(value, tsort) do
				if containsTable then
					table.insert(str_table, "\n\t" .. prefix)
				else
					table.insert(str_table, " ")
				end
				
				if type(key) == "string" then
					table.insert(str_table, "[" .. export.modified_dump(key) .. "] = ")
				end
				
				table.insert(str_table, type(key) == "number" and type(val) == "number" and string.format("0x%05X", val) or export.modified_dump(val))
				
				if not (consecutive and #value == 3) or type(key) == "number" and value[key + 1] then
					table.insert(str_table, ",")
				end
			end
			
			if containsTable then
				table.insert(str_table, "\n" .. prefix)
			else
				table.insert(str_table, " ")
			end
			
			table.insert(str_table, "}")
			return table.concat(str_table)
		end
		
		table.insert(str_table, " {")
		
		for key, val in require("Module:table").sortedPairs(value, tsort) do
			table.insert(str_table, " " .. prefix .. "\t[" .. export.modified_dump(key, prefix .. "\t") .. "] = " .. export.modified_dump(val, prefix .. "\t"):gsub("^ ", "") .. ",")
		end
		
		table.insert(str_table, " " .. prefix .. "}")
		
		return table.concat(str_table, "\n")
	elseif t == "number" and value > 46 then
		return string.format("0x%05X", value)
	else
		return tostring(value)
	end
end
	

export.track = require("Module:debug/track")


-- Trigger a script error from a template
function export.error(frame)
	error(frame.args[1] or "(no message specified)")
end

--[[
	Convenience function for generating syntaxhighlight tags.
	Display defaults to block.
	Options is a table. To display inline text with HTML highlighting:
		{ inline = true, lang = "html" }
]]
function export.highlight(content, options)
	if type(content) == "table" then
		options = content
		options = {
			lang = options.lang or "lua",
			inline = options.inline and true
		}
		return function(content)
			return mw.getCurrentFrame():extensionTag{
				name = "syntaxhighlight",
				content = content,
				args = options
			}
		end
	else
		return mw.getCurrentFrame():extensionTag{
			name = "syntaxhighlight",
			content = content,
			args = {
				lang = options and options.lang or "lua",
				inline = options and options.inline and true or nil
			}
		}
	end
end

function export.track_unrecognized_args(args, template_name)
	local function track(code)
		export.track(template_name .. "/" .. code)
	end
	
    track("unrecognized arg")
	
	local arg_list = {}
	for arg, value in pairs(args) do
		track("unrecognized arg/" .. arg)
		table.insert(arg_list, ("|%s=%s"):format(arg, value))
	end
	
	mw.log(
		("Unrecognized parameter%s in {{%s}}: %s."):format(
			arg_list[2] and "s" or "",
			template_name,
			table.concat(arg_list, ", ")))
end

do
	local placeholder = "_message_"
	
	function export.placeholder_error(frame)
		-- A dummy function that throws an error with a placeholder message.
		error(placeholder, (frame.args.level or 1) + 6)
	end
	
	-- Throw an error via callParserFunction, which generates a real error with traceback, automatic categorization in [[CAT:E]] etc., but the error message is returned as a string. Then, replace the placeholder error message with `message`, which is preprocessed. This is necessary when preprocessing needs to be applied (e.g. when using <pre> tags), since otherwise strip markers and other half-processed text gets displayed instead.
	function export.formatted_error(message, level)
		local frame = mw.getCurrentFrame()
		return (frame:callParserFunction("#invoke", {"debug", "placeholder_error", level = level})
			:gsub(placeholder, frame:preprocess(message)))
	end
end

return export
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