Add source files: models and parser

src/gdiffer/models.py

@@ -0,0 +1,108 @@
+"""Data models for git diff parsing and analysis."""
+
+from dataclasses import dataclass, field
+from typing import Optional
+
+
+@dataclass
+class DiffHunk:
+    """Represents a single hunk (chunk) of changes in a diff."""
+    old_start: int
+    old_lines: int
+    new_start: int
+    new_lines: int
+    old_lines_content: list[str] = field(default_factory=list)
+    new_lines_content: list[str] = field(default_factory=list)
+    header: str = ""
+
+    def get_added_lines(self) -> list[tuple[int, str]]:
+        result = []
+        for i, line in enumerate(self.new_lines_content):
+            if line.startswith('+') and not line.startswith('+++'):
+                result.append((self.new_start + i, line[1:]))
+        return result
+
+    def get_removed_lines(self) -> list[tuple[int, str]]:
+        result = []
+        for i, line in enumerate(self.old_lines_content):
+            if line.startswith('-') and not line.startswith('---'):
+                result.append((self.old_start + i, line[1:]))
+        return result
+
+    def get_modified_lines(self) -> list[tuple[int, str, str]]:
+        result = []
+        added = self.get_added_lines()
+        removed = self.get_removed_lines()
+        for i, (old_line, old_content) in enumerate(removed):
+            if i < len(added):
+                new_line, new_content = added[i]
+                if old_content != new_content:
+                    result.append((old_line, old_content, new_content))
+        return result
+
+
+@dataclass
+class DiffFile:
+    """Represents a file in the diff with its changes."""
+    old_path: Optional[str]
+    new_path: Optional[str]
+    new_file_mode: Optional[str] = None
+    deleted_file_mode: Optional[str] = None
+    similarity_index: Optional[str] = None
+    rename_from: Optional[str] = None
+    rename_to: Optional[str] = None
+    hunks: list[DiffHunk] = field(default_factory=list)
+    change_type: str = "modify"
+
+    @property
+    def filename(self) -> str:
+        if self.new_path:
+            return self.new_path
+        return self.old_path or ""
+
+    @property
+    def is_new(self) -> bool:
+        return self.new_file_mode is not None or self.old_path in [None, "/dev/null"]
+
+    @property
+    def is_deleted(self) -> bool:
+        return self.deleted_file_mode is not None
+
+    @property
+    def is_rename(self) -> bool:
+        return self.rename_from is not None
+
+    @property
+    def extension(self) -> str:
+        filename = self.filename
+        if '.' in filename:
+            return filename.rsplit('.', 1)[-1].lower()
+        return ""
+
+
+@dataclass
+class CodeChange:
+    """Represents a code change with context."""
+    file: DiffFile
+    hunk: Optional[DiffHunk]
+    old_code: str
+    new_code: str
+    language: str = "unknown"
+    summary: str = ""
+    issues: list[dict] = field(default_factory=list)
+    suggestions: list[str] = field(default_factory=list)
+
+
+@dataclass
+class DiffAnalysis:
+    """Complete analysis result for a diff."""
+    files: list[DiffFile] = field(default_factory=list)
+    total_files: int = 0
+    files_added: int = 0
+    files_deleted: int = 0
+    files_modified: int = 0
+    files_renamed: int = 0
+    total_changes: int = 0
+    language_breakdown: dict[str, int] = field(default_factory=dict)
+    all_issues: list[dict] = field(default_factory=list)
+    all_suggestions: list[str] = field(default_factory=list)