Add source code files

src/codeguard/utils/ignore.py

@@ -0,0 +1,89 @@
+"""Ignore file parser for CodeGuard."""
+
+from pathlib import Path
+
+
+class IgnoreParser:
+    def __init__(self):
+        self.patterns: list[dict] = []
+
+    def load_from_file(self, file_path: Path) -> None:
+        if not file_path.exists():
+            return
+
+        with open(file_path, "r") as f:
+            for line in f:
+                line = line.strip()
+                if line and not line.startswith("#"):
+                    self.add_pattern(line)
+
+    def add_pattern(self, pattern: str) -> None:
+        negate = pattern.startswith("!")
+        if negate:
+            pattern = pattern[1:]
+
+        if pattern.startswith("/"):
+            pattern = pattern[1:]
+            is_absolute = True
+        else:
+            is_absolute = False
+
+        self.patterns.append({
+            "pattern": pattern,
+            "negate": negate,
+            "is_absolute": is_absolute,
+        })
+
+    def should_ignore(self, path: str) -> bool:
+        path_parts = path.split("/")
+
+        for p in self.patterns:
+            if p["is_absolute"]:
+                if self._match_absolute(p["pattern"], path):
+                    return not p["negate"]
+            else:
+                if self._match_relative(p["pattern"], path_parts):
+                    return not p["negate"]
+
+        return False
+
+    def _match_absolute(self, pattern: str, path: str) -> bool:
+        if pattern.endswith("/"):
+            pattern = pattern.rstrip("/")
+            return path.startswith(pattern + "/") or path == pattern
+
+        return pattern in path or self._glob_match(pattern, path)
+
+    def _match_relative(self, pattern: str, path_parts: list[str]) -> bool:
+        pattern_parts = pattern.split("/")
+
+        if pattern.startswith("**"):
+            return True
+
+        if len(pattern_parts) > len(path_parts):
+            return False
+
+        for i, pp in enumerate(pattern_parts):
+            if pp == "**":
+                return True
+            if pp == "*":
+                continue
+            if i >= len(path_parts) or not self._glob_match(pp, path_parts[i]):
+                return False
+
+        return True
+
+    def _glob_match(self, pattern: str, string: str) -> bool:
+        if pattern == "*":
+            return True
+
+        if pattern.startswith("*") and pattern.endswith("*"):
+            return pattern[1:-1] in string
+
+        if pattern.startswith("*"):
+            return string.endswith(pattern[1:])
+
+        if pattern.endswith("*"):
+            return string.startswith(pattern[:-1])
+
+        return pattern == string