libs/web: drop the Lua template parser, the C implementation is faster in almost every case, even without caching

1 files changed, 11 insertions, 141 deletions

diff --git a/libs/web/luasrc/template.lua b/libs/web/luasrc/template.lua
index 7cc6e11b0..90ac69fba 100644
--- a/libs/web/luasrc/template.lua
+++ b/libs/web/luasrc/template.lua
@@ -30,7 +30,6 @@ local util = require "luci.util"
 local table = require "table"
 local string = require "string"
 local config = require "luci.config"
-local coroutine = require "coroutine"
 local nixio = require "nixio", require "nixio.util"
 local tparser = require "luci.template.parser"
 
@@ -43,84 +42,12 @@ local assert, type, error = assert, type, error
 module "luci.template"
 
 config.template = config.template or {}
-
-viewdir    = config.template.viewdir or util.libpath() .. "/view"
-compiledir = config.template.compiledir or util.libpath() .. "/view"
-
-
--- Compile modes:
--- memory:	Always compile, do not save compiled files, ignore precompiled 
--- file:	Compile on demand, save compiled files, update precompiled
-compiler_mode = config.template.compiler_mode or "memory"
+viewdir = config.template.viewdir or util.libpath() .. "/view"
 
 
 -- Define the namespace for template modules
 context = util.threadlocal()
 
---- Manually  compile a given template into an executable Lua function
--- @param template	LuCI template
--- @return 			Lua template function
-function compile(template)	
-	local expr = {}
-
-	-- Search all <% %> expressions
-	local function expr_add(ws1, skip1, command, skip2, ws2)
-		expr[#expr+1] = command
-		return ( #skip1 > 0 and "" or ws1 ) .. 
-		       "<%" .. tostring(#expr) .. "%>" ..
-		       ( #skip2 > 0 and "" or ws2 )
-	end
-	
-	-- Save all expressiosn to table "expr"
-	template = template:gsub("(%s*)<%%(%-?)(.-)(%-?)%%>(%s*)", expr_add)
-	
-	local function sanitize(s)
-		s = "%q" % s
-		return s:sub(2, #s-1)
-	end
-	
-	-- Escape and sanitize all the template (all non-expressions)
-	template = sanitize(template)
-
-	-- Template module header/footer declaration
-	local header = 'write("'
-	local footer = '")'
-	
-	template = header .. template .. footer
-	
-	-- Replacements
-	local r_include = '")\ninclude("%s")\nwrite("'
-	local r_i18n    = '")\nwrite(translate("%1","%2"))\nwrite("'
-	local r_i18n2   = '")\nwrite(translate("%1", ""))\nwrite("'
-	local r_pexec   = '")\nwrite(tostring(%s or ""))\nwrite("'
-	local r_exec    = '")\n%s\nwrite("'
-	
-	-- Parse the expressions
-	for k,v in pairs(expr) do
-		local p = v:sub(1, 1)
-		v = v:gsub("%%", "%%%%")
-		local re = nil
-		if p == "+" then
-			re = r_include:format(sanitize(string.sub(v, 2)))
-		elseif p == ":" then
-			if v:find(" ") then
-				re = sanitize(v):gsub(":(.-) (.*)", r_i18n)
-			else
-				re = sanitize(v):gsub(":(.+)", r_i18n2)
-			end
-		elseif p == "=" then
-			re = r_pexec:format(v:sub(2))
-		elseif p == "#" then
-			re = ""
-		else
-			re = r_exec:format(v)
-		end
-		template = template:gsub("<%%"..tostring(k).."%%>", re)
-	end
-
-	return loadstring(template)
-end
-
 --- Render a certain template.
 -- @param name		Template name
 -- @param scope		Scope to assign to template (optional)
@@ -138,21 +65,6 @@ Template.cache = setmetatable({}, {__mode = "v"})
 
 -- Constructor - Reads and compiles the template on-demand
 function Template.__init__(self, name)	
-	local function _encode_filename(str)
-
-		local function __chrenc( chr )
-			return "%%%02x" % string.byte( chr )
-		end
-
-		if type(str) == "string" then
-			str = str:gsub(
-				"([^a-zA-Z0-9$_%-%.%+!*'(),])",
-				__chrenc
-			)
-		end
-
-		return str
-	end
 
 	self.template = self.cache[name]
 	self.name = name
@@ -161,60 +73,18 @@ function Template.__init__(self, name)
 	self.viewns = context.viewns
 	
 	-- If we have a cached template, skip compiling and loading
-	if self.template then
-		return
-	end
-	
-	-- Enforce cache security
-	local cdir = compiledir .. "/" .. sys.process.info("uid")
-	
-	-- Compile and build
-	local sourcefile   = viewdir    .. "/" .. name
-	local compiledfile = cdir .. "/" .. _encode_filename(name) .. ".lua"
-	local err	
-	
-	if compiler_mode == "file" then
-		local tplmt = fs.stat(sourcefile, "mtime") or fs.stat(sourcefile .. ".htm", "mtime")
-		local commt = fs.stat(compiledfile, "mtime")
-		
-		if not fs.stat(cdir, "mtime") then
-			fs.mkdirr(cdir)
-			fs.chmod(fs.dirname(cdir), 777)
-		end
-		
-		assert(tplmt or commt, "No such template: " .. name)
-				
-		-- Build if there is no compiled file or if compiled file is outdated
-		if not commt or (commt and tplmt and commt < tplmt) then
-			local source
-			source, err = fs.readfile(sourcefile) or fs.readfile(sourcefile .. ".htm")
-			
-			if source then
-				local compiled, err = compile(source)
-				
-				local f = nixio.open(compiledfile, "w", 600)
-				f:writeall(util.get_bytecode(compiled))
-				f:close()
-				self.template = compiled
-			end
+	if not self.template then
+
+		-- Compile template
+		local sourcefile = viewdir .. "/" .. name .. ".htm"
+		self.template, _, err = tparser.parse(sourcefile)
+
+		-- If we have no valid template throw error, otherwise cache the template
+		if not self.template then
+			error(err)
 		else
-			assert(
-				sys.process.info("uid") == fs.stat(compiledfile, "uid")
-				and fs.stat(compiledfile, "modestr") == "rw-------",
-				"Fatal: Cachefile is not sane!"
-			)
-			self.template, err = loadfile(compiledfile)
+			self.cache[name] = self.template
 		end
-		
-	elseif compiler_mode == "memory" then
-		self.template, _, err = tparser.parse(sourcefile .. ".htm")
-	end
-	
-	-- If we have no valid template throw error, otherwise cache the template
-	if not self.template then
-		error(err)
-	else
-		self.cache[name] = self.template
 	end
 end