diff --git a/lint.py b/lint.py
new file mode 100644
index 0000000..2c444da
--- /dev/null
+++ b/lint.py
@@ -0,0 +1,174 @@
+import re
+import toml
+import argparse
+import sys
+from collections import defaultdict
+import time
+
+class LintRule:
+	def __init__(self, name, pattern, exception_names=None, enforce=False, comment=""):
+		self.name = name
+		self.pattern = re.compile(pattern)
+		self.exception_names = exception_names if exception_names else []
+		self.exceptions = []  # 将被填充为实际的规则对象
+		self.enforce = enforce
+		self.comment = comment
+		self.depth = 0  # 用于检测循环引用
+
+	def add_exception(self, rule):
+		"""添加例外规则引用"""
+		self.exceptions.append(rule)
+
+class Linter:
+	def __init__(self, config_file="lint.toml"):
+		self.rules = []
+		self.rule_map = {}
+		self.load_rules(config_file)
+		self.resolve_exceptions()
+
+	def load_rules(self, config_file):
+		"""从TOML文件加载规则配置"""
+		try:
+			with open(config_file, "r") as f:
+				config = toml.load(f)
+		except FileNotFoundError:
+			print(f"Error: Config file '{config_file}' not found", file=sys.stderr)
+			sys.exit(1)
+		except toml.TomlDecodeError as e:
+			print(f"Error parsing TOML: {e}", file=sys.stderr)
+			sys.exit(1)
+
+		for rule_config in config.get("rule", []):
+			try:
+				rule = LintRule(
+					name=rule_config["name"],
+					pattern=rule_config["pattern"],
+					exception_names=rule_config.get("exceptions"),
+					enforce=rule_config.get("enforce", False),
+					comment=rule_config.get("comment", "")
+				)
+				self.rules.append(rule)
+				self.rule_map[rule.name] = rule
+			except KeyError as e:
+				print(f"Error: Missing required field '{e}' in rule", file=sys.stderr)
+				sys.exit(1)
+			except re.error as e:
+				print(f"Error compiling regex in rule '{rule_config.get('name', '')}': {e}", file=sys.stderr)
+				sys.exit(1)
+
+	def resolve_exceptions(self):
+		"""解析规则间的依赖关系"""
+		# 第一遍：添加直接例外引用
+		for rule in self.rules:
+			for exception_name in rule.exception_names:
+				if exception_name in self.rule_map:
+					rule.add_exception(self.rule_map[exception_name])
+				else:
+					print(f"Error: Rule '{rule.name}' references undefined exception rule '{exception_name}'", file=sys.stderr)
+					sys.exit(1)
+
+		# 第二遍：计算规则深度（用于检测循环依赖）
+		changed = True
+		while changed:
+			changed = False
+			for rule in self.rules:
+				if rule.exceptions:
+					new_depth = max(e.depth for e in rule.exceptions) + 1
+					if new_depth > len(self.rules):
+						print(f"Error: Circular dependency detected in rule '{rule.name}'", file=sys.stderr)
+						sys.exit(1)
+					if new_depth > rule.depth:
+						rule.depth = new_depth
+						changed = True
+
+	def match_rule(self, rule, text, visited=None):
+		"""
+		递归检查规则匹配
+		- 主规则匹配成功
+		- 所有例外规则都不匹配
+		"""
+		if visited is None:
+			visited = set()
+
+		# 检测循环引用
+		if rule.name in visited:
+			print(f"Warning: Circular rule reference detected while matching '{rule.name}', skipping")
+			return False
+
+		visited.add(rule.name)
+
+		# 检查主规则是否匹配
+		if not rule.pattern.search(text):
+			return False
+
+		# 检查例外规则：任何一个例外规则匹配则整个规则不匹配
+		for exception in rule.exceptions:
+			if self.match_rule(exception, text, visited.copy()):
+				return False
+
+		return True
+
+	def lint_file(self, file_path):
+		"""检查单个文件并返回违规列表"""
+		try:
+			with open(file_path, "r") as f:
+				lines = f.readlines()
+		except IOError as e:
+			print(f"Error reading file {file_path}: {e}", file=sys.stderr)
+			return []
+
+		violations = []
+		for line_num, line in enumerate(lines, start=1):
+			# 保留行尾换行符以正确匹配行尾模式
+			line_with_nl = line
+
+			for rule in self.rules:
+				if rule.enforce and self.match_rule(rule, line_with_nl):
+					violations.append({
+						"file": file_path,
+						"line": line_num,
+						"rule": rule.name,
+						"comment": rule.comment,
+						"text": line.rstrip('\n')  # 去除换行符用于显示
+					})
+
+		return violations
+
+def main():
+	parser = argparse.ArgumentParser(description="Simple Document Format Linter")
+	parser.add_argument("files", nargs="+", help="Files to lint")
+	parser.add_argument("--config", default="lint.toml", help="Path to config file")
+	args = parser.parse_args()
+
+	start_time = time.time()  # Start timing
+
+	linter = Linter(args.config)
+
+	total_violations = 0
+	is_tty = sys.stdout.isatty()
+	RED = "\033[31m" if is_tty else ""
+	RESET = "\033[0m" if is_tty else ""
+	GRAY = "\033[90m" if is_tty else ""
+	GREEN = "\033[32m" if is_tty else ""
+
+	for file_path in args.files:
+		violations = linter.lint_file(file_path)
+		total_violations += len(violations)
+
+		for v in violations:
+			comment = f" - {v['comment']}" if v['comment'] else ""
+			# Highlight violation header in red, violation text in gray if TTY
+			print(f"{RED}{v['file']}:{v['line']}{RESET} [{v['rule']}]{comment}")
+			print(f"{GRAY}  | {v['text']}{RESET}")
+
+	elapsed = time.time() - start_time  # End timing
+
+	if total_violations == 0:
+		print(f"{GREEN}[OK] No violations found.{RESET}")
+	else:
+		print(f"\nFound {total_violations} violation(s).")
+	print(f"Lint done in {elapsed:.3f} seconds.")  # Show elapsed time
+	sys.exit(1 if total_violations > 0 else 0)
+
+if __name__ == "__main__":
+	main()
diff --git a/lint.toml b/lint.toml
new file mode 100644
index 0000000..22c4c03
--- /dev/null
+++ b/lint.toml
@@ -0,0 +1,17 @@
+[[rule]]
+name = "trailing-whitespace"
+pattern = "\\s+\\n$"
+enforce = true
+comment = "Trailing whitespace at line end"
+
+[[rule]]
+name = "not-centered-dots-within-big-notations"
+pattern = "[=+][\\s&]*dots[^\\.]"
+enforce = true
+comment = "Please use dots.c within = or +"
+
+[[rule]]
+name = "centered-dots-within-small-notations"
+pattern = "[,][\\s&]*dots\\.c"
+enforce = true
+comment = "Please use dots within ,"