alter extension parsingHEADtrunk

1 files changed, 29 insertions, 10 deletions

diff --git a/prose.lua b/prose.lua
index 90172ec..83e6f5d 100644
--- a/prose.lua
+++ b/prose.lua
@@ -24,17 +24,24 @@ local function prose(S, text)
 			function(a,x,b) return a..emplace(T[tagname](x))..b end
 		}
 	end
-
+	local function strip(s)
+		local q = s:match("^%s*(.-)%s*$")
+		return q or s
+	end
+	local function split(s)
+		local r = {}
+		for u in s:gmatch("%w+") do table.insert(r,u) end
+		return r
+	end
 	local function extension(str)
-		local verb, rest = str:match("^{(%w+);%s*(.*)}$")
-		if verb then
-			return emplace(extensions[verb](S, rest))
-		end
-		local verbonly = str:match("^{(%w+)}$")
-		if verbonly then
-			return emplace(extensions[verbonly](S))
-		end
-		error("invalid extension syntax: "..str)
+		local verb, rest = assert(str:match("^{%s*([^%s;]+)(.*)}$"))
+		local args, body = rest:match("(.-);(.*)")
+		if not args then args = rest; body = '' end
+		verb = strip(verb)
+		args = split(args)
+		body = strip(body)
+		-- return verb, args, body
+		return emplace(extensions[verb](S, body, table.unpack(args)))
 	end
 
 	local subs = {
@@ -100,6 +107,18 @@ extensions.a = function(S,text)
 	return T.a({href=url},body)
 end
 
+extensions.def = function(S,text,name)
+	if extensions[name] then
+		io.stderr:write("warning: redefining extension "..name.."\n")
+	end
+	local fn = assert(load(
+		string.format("return %s", text),
+		"def "..name, "t",
+		setmetatable({S=S, T=T, html=html, prose=prose}, {__index=_G})
+	))
+	extensions[name]=fn()
+end
+
 setmetatable(extensions, {__index = function(t, k)
 	return function(S, text)
 		io.stderr:write("warning: unknown extension "..k.."\n")