template renderer

core/runner/sandbox.lua

@@ -430,6 +430,108 @@ local util = {
     }
 }
 
+-- ======================================================================
+-- TEMPLATE RENDER FUNCTION
+-- ======================================================================
+
+_G.render = function(template_str, env)
+	local OPEN_TAG, CLOSE_TAG = "<?", "?>"
+
+	-- Helper functions
+	local function escape_html(s)
+		local entities = {['&']='&amp;', ['<']='&lt;', ['>']='&gt;', ['"']='&quot;', ["'"]='&#039;'}
+		return (s:gsub([=[["><'&]]=], entities))
+	end
+
+	local function get_line(s, ln)
+		for line in s:gmatch("([^\n]*)\n?") do
+		if ln == 1 then return line end
+		ln = ln - 1
+		end
+	end
+
+	local function pos_to_line(s, pos)
+		local line = 1
+		for _ in s:sub(1, pos):gmatch("\n") do line = line + 1 end
+		return line
+	end
+
+	-- Parse template
+	local pos, chunks = 1, {}
+	while pos <= #template_str do
+		local start, stop = template_str:find(OPEN_TAG, pos, true)
+		if not start then
+			table.insert(chunks, template_str:sub(pos))
+			break
+		end
+
+		if start > pos then
+			table.insert(chunks, template_str:sub(pos, start-1))
+		end
+
+		pos = stop + 1
+		local modifier = template_str:match("^[=-]", pos)
+		if modifier then pos = pos + 1 end
+
+		local close_start, close_stop = template_str:find(CLOSE_TAG, pos, true)
+		if not close_start then
+			error("Failed to find closing tag at position " .. pos)
+		end
+
+		local trim_newline = false
+		if template_str:sub(close_start-1, close_start-1) == "-" then
+			close_start = close_start - 1
+			trim_newline = true
+		end
+
+		local code = template_str:sub(pos, close_start-1)
+		table.insert(chunks, {modifier or "code", code, pos})
+
+		pos = close_stop + 1
+		if trim_newline and template_str:sub(pos, pos) == "\n" then
+			pos = pos + 1
+		end
+	end
+
+	-- Compile chunks to Lua code
+	local buffer = {"local _tostring, _escape, _b, _b_i = ...\n"}
+	for _, chunk in ipairs(chunks) do
+		local t = type(chunk)
+		if t == "string" then
+			table.insert(buffer, "_b_i = _b_i + 1\n")
+			table.insert(buffer, "_b[_b_i] = " .. string.format("%q", chunk) .. "\n")
+		else
+			t = chunk[1]
+			if t == "code" then
+				table.insert(buffer, "--[[" .. chunk[3] .. "]] " .. chunk[2] .. "\n")
+			elseif t == "=" or t == "-" then
+				table.insert(buffer, "_b_i = _b_i + 1\n")
+				table.insert(buffer, "--[[" .. chunk[3] .. "]] _b[_b_i] = ")
+				if t == "=" then
+					table.insert(buffer, "_escape(_tostring(" .. chunk[2] .. "))\n")
+				else
+					table.insert(buffer, "_tostring(" .. chunk[2] .. ")\n")
+				end
+			end
+		end
+	end
+	table.insert(buffer, "return _b")
+
+	-- Load the compiled code
+	local fn, err = loadstring(table.concat(buffer))
+	if not fn then error(err) end
+
+	-- Create execution environment
+	env = env or {}
+	local runtime_env = setmetatable({}, {__index = function(_, k) return env[k] or _G[k] end})
+
+	setfenv(fn, runtime_env)
+
+	local output_buffer = {}
+	fn(tostring, escape_html, output_buffer, 0)
+	return table.concat(output_buffer)
+end
+
 -- ======================================================================
 -- REGISTER MODULES GLOBALLY
 -- ======================================================================

go.sum

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