Module:Template input parse: Difference between revisions

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@@ Line 48: / Line 48: @@
 		return nil
 	end
+end
+-- Helper function
+-- Parses a pair of numeric values
+function p.parse_numeric_pair(unparsed, delimiter)
+	local parsed = {}
+	local delimiter = delimiter or ':'
+	local expr = '([^' .. delimiter .. ']+)'
+	for entry in string.gmatch(unparsed, expr) do
+		local trimmed = entry:gsub("^%s*(.-)%s*$", "%1")
+		local numeric = tonumber(trimmed)
+		table.insert(parsed, numeric)		-- Add to array
+	end
+	if #parsed == 2 then
+		return parsed
+	else
+		return nil
+	end
+end
+-- Helper function
+-- Parses a list of numeric pairs
+-- Delimiter between each pair must be a semicolon
+-- Delimiter between the pair's two values can be anything; default is slash
+-- as the intended use is parsing ratios a/b
+function p.parse_numeric_pairs(unparsed, delimiter)
+	local delimiter = delimiter or "/"
+	-- Split the string of unparsed pairs
+	local parsed = p.parse_entries(unparsed)
+	-- Then tokenize the tokens into numeric pairs
+	local pairs_ = {}
+	for i = 1, #parsed do
+		local pair = p.parse_numeric_pair(parsed[i], delimiter)
+		if pair ~= nil and #pair == 2 then
+			table.insert(pair)
+		end
+	end
+	return pairs_
 end