Feat: Add syntax highlighting for a lot more languages

samples/lua.lua

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+#!/usr/bin/env lua
+-- Lua syntax highlighting test file
+
+-- Constants
+PI = 3.14159
+MAX_COUNT = 100
+
+-- Variables
+local counter = 0
+local name = "Lua"
+
+-- Built-in variable
+print(self)
+
+-- Functions
+function greet(user)
+	print("Hello, " .. user)
+end
+
+local function add(a, b)
+	return a + b
+end
+
+-- Method definitions
+local obj = {}
+function obj:sayHi()
+	print("Hi from method!")
+end
+
+obj.sayHello = function()
+	print("Hello from field function!")
+end
+
+-- Arrow-style anonymous function (LuaJIT/CFFI style)
+local arrow = function(x)
+	return x * 2
+end
+
+-- Table constructors
+local t = {
+	foo = 123,
+	bar = function()
+		return "bar"
+	end,
+	nested = {
+		a = 1,
+		b = 2,
+	},
+}
+
+-- Loops
+for i = 1, MAX_COUNT do
+	counter = counter + i
+end
+
+while counter > 0 do
+	counter = counter - 1
+end
+
+repeat
+	counter = counter + 1
+until counter == 10
+
+-- Conditionals
+if counter > 5 then
+	print("Big number")
+elseif counter == 5 then
+	print("Exactly five")
+else
+	print("Small number")
+end
+
+-- Operators
+local x, y = 10, 20
+local z = x + y * 2 - (x / y) ^ 2
+local ok = x == y or x ~= y and not false
+
+-- Function calls
+greet("World")
+obj:sayHi()
+obj.sayHello()
+add(5, 10)
+
+-- Built-in function calls
+assert(x > 0)
+pcall(function()
+	print("safe")
+end)
+tonumber("123")
+
+-- CFFI injection example
+local ffi = require("ffi")
+ffi.cdef([[
+    int printf(const char *fmt, ...);
+    typedef struct { int x; int y; } point;
+]])
+
+-- Boolean and nil
+local flag = true
+local nothing = nil
+
+-- Comments
+-- Single line
+--[[
+    Multi-line
+    comment
+]]
+
+-- Strings
+local s1 = "Hello\nWorld"
+local s2 = [[Long
+multi-line
+string]]
+
+-- Template strings (LuaJIT-style)
+local tpl = `Value: ${counter}`
+
+-- Regex-like string (for testing injection highlighting)
+local re = "/^%a+$/"