[modified] moved tablex.stringify to stringx.pretty

stringx.lua

@@ -8,15 +8,24 @@ local stringx = setmetatable({}, {
 
 --split a string on a delimiter into an ordered table
 function stringx:split(delim)
-	--try to create as little garbage as possible!
-	--one table to contain the result, plus the split strings should be all we need
-	--as such we work with the bytes underlying the string, as string.find is not compiled on older luajit :)
+	--we try to create as little garbage as possible!
+	--only one table to contain the result, plus the split strings.
+	--so we do two passes, and  work with the bytes underlying the string
+	--partly because string.find is not compiled on older luajit :)
+	local res = {}
 	local length = self:len()
 	--
 	local delim_length = delim:len()
+	--empty delim? split to individual characters
+	if delim_length == 0 then
+		for i = 1, length do
+			table.insert(res, self:sub(i, i))
+		end
+		return res
+	end
 	local delim_start = delim:byte(1)
-	--iterate through and collect split sites
-	local res = {}
+	--pass 1
+	--collect split sites
 	local i = 1
 	while i <= length do
 		--scan for delimiter
@@ -38,7 +47,8 @@ function stringx:split(delim)
 			i = i + 1
 		end
 	end
-	--re-iterate, collecting substrings
+	--pass 2
+	--collect substrings
 	i = 1
 	for si, j in ipairs(res) do
 		res[si] = self:sub(i, j-1)
@@ -50,4 +60,47 @@ function stringx:split(delim)
 	return res
 end
 
+
+--turn input into a vaguely easy to read string
+--(which is also able to be parsed by lua in many cases)
+--todo: multi-line for big tables
+--todo: support self-referential tables at least without crashing :)
+function stringx.pretty(input)
+	--if the input is not a table, or it has a tostring metamethod
+	--then we can just use tostring
+	local mt = getmetatable(input)
+	if type(input) ~= "table" or mt and mt.__tostring then
+		local s = tostring(input)
+		--quote strings
+		if type(input) == "string" then
+			s = '"' .. s .. '"'
+		end
+		return s
+	end
+
+	--otherwise, we've got to build up a table representation
+	--collate into member chunks
+	local chunks = {}
+	--(tracking for already-seen elements from ipairs)
+	local seen = {}
+	--sequential part first
+	--(in practice, pairs already does this, but the order isn't guaranteed)
+	for i, v in ipairs(input) do
+		seen[i] = true
+		table.insert(chunks, stringx.pretty(v))
+	end
+	--non sequential follows
+	for k, v in pairs(input) do
+		if not seen[k] then
+			--encapsulate anything that's not a string
+			--todo: also keywords
+			if type(k) ~= "string" then
+				k = "[" .. tostring(k) .. "]"
+			end
+			table.insert(chunks, k .. " = " .. stringx.pretty(v))
+		end
+	end
+	return "{" .. table.concat(chunks, ", ") .. "}"
+end
+
 return stringx

tablex.lua

@@ -269,44 +269,6 @@ function tablex.overlay(to, from)
 	return to
 end
 
---turn a table into a vaguely easy to read string
---which is also able to be parsed by lua in most cases
-function tablex.stringify(t)
-	--if the input is not a table, or it has a tostring metamethod
-	--just use tostring
-	local mt = getmetatable(t)
-	if type(t) ~= "table" or mt and mt.__tostring then
-		local s = tostring(t)
-		--quote strings
-		if type(t) == "string" then
-			s = '"' .. s .. '"'
-		end
-		return s
-	end
-
-	--otherwise, collate into member chunks
-	local chunks = {}
-	--(tracking for already-seen elements from ipairs)
-	local seen = {}
-	--sequential part first
-	for i, v in ipairs(t) do
-		seen[i] = true
-		table.insert(chunks, tablex.stringify(v))
-	end
-	--non sequential follows
-	for k, v in pairs(t) do
-		if not seen[k] then
-			--encapsulate anything that's not a string
-			--todo: also keywords
-			if type(k) ~= "string" then
-				k = "[" .. tostring(k) .. "]"
-			end
-			table.insert(chunks, k .. " = " .. tablex.stringify(v))
-		end
-	end
-	return "{" .. table.concat(chunks, ", ") .. "}"
-end
-
 --faster unpacking for known-length tables up to 8
 --gets around nyi in luajit
 --note: you can use a larger unpack than you need as the rest