fix: resolve CI type checking and lint failures
This commit is contained in:
336
app/depnav/src/depnav/parser.py
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336
app/depnav/src/depnav/parser.py
Normal file
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"""Language-specific parsers for extracting dependencies from source files."""
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import re
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from abc import ABC, abstractmethod
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from pathlib import Path
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from typing import Callable, Literal, Optional
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try:
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import tree_sitter
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from tree_sitter import Language
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except ImportError:
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tree_sitter = None # type: ignore[assignment]
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try:
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import tree_sitter_python
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except ImportError:
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tree_sitter_python = None # type: ignore[assignment]
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try:
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import tree_sitter_javascript
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except ImportError:
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tree_sitter_javascript = None # type: ignore[assignment]
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try:
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import tree_sitter_go
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except ImportError:
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tree_sitter_go = None # type: ignore[assignment]
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LanguageType = Literal["python", "javascript", "typescript", "go"]
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class DependencyParser(ABC):
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"""Abstract base class for language parsers."""
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@abstractmethod
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def parse_file(self, file_path: Path) -> list[str]:
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"""Extract dependencies from a file."""
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pass
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@abstractmethod
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def get_language(self) -> str:
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"""Return the language identifier."""
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pass
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def get_language_library(lang: str):
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"""Get the tree-sitter library for a language."""
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lang_map = {
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"python": tree_sitter_python,
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"javascript": tree_sitter_javascript,
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"typescript": tree_sitter_javascript,
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"go": tree_sitter_go,
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}
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return lang_map.get(lang)
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class PythonParser(DependencyParser):
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"""Parser for Python files using tree-sitter."""
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def __init__(self):
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self._parser = None # type: ignore[assignment]
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def _get_parser(self):
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if self._parser is None:
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if tree_sitter_python is None:
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raise ImportError("tree-sitter-python is not installed")
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if tree_sitter is None:
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raise ImportError("tree-sitter is not installed")
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lang = Language(tree_sitter_python.language()) # type: ignore[arg-type]
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self._parser = tree_sitter.Parser() # type: ignore[operator]
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self._parser.set_language(lang) # type: ignore[operator]
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return self._parser
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def get_language(self) -> str:
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return "python"
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def parse_file(self, file_path: Path) -> list[str]:
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"""Extract Python imports from a file."""
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try:
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content = file_path.read_text(encoding="utf-8")
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except (UnicodeDecodeError, OSError):
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return []
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if tree_sitter is None or tree_sitter_python is None:
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return self._regex_parse(content)
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try:
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parser = self._get_parser()
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tree = parser.parse(bytes(content, "utf-8"))
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return self._extract_imports(tree.root_node, content)
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except Exception:
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return self._regex_parse(content)
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def _regex_parse(self, content: str) -> list[str]:
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"""Fallback regex-based parsing for Python."""
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imports = []
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import_pattern = re.compile(
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r"^\s*(?:from|import)\s+(.+?)(?:\s+import\s+.*)?(?:\s*;?\s*)$",
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re.MULTILINE,
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)
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for match in import_pattern.finditer(content):
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module = match.group(1).strip()
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if module:
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for part in module.split(","):
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clean_part = part.strip().split(" as ")[0].split(".")[0]
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if clean_part:
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imports.append(clean_part)
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return list(set(imports))
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def _extract_imports(
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self, node: tree_sitter.Node, content: str
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) -> list[str]:
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"""Extract imports from tree-sitter parse tree."""
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imports = []
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if node.type == "import_statement":
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module = self._get_module_name(node, content)
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if module:
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imports.append(module.split(".")[0])
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elif node.type == "from_import_statement":
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module = self._get_module_name(node, content)
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if module:
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imports.append(module.split(".")[0])
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for child in node.children:
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imports.extend(self._extract_imports(child, content))
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return list(set(imports))
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def _get_module_name(self, node: tree_sitter.Node, content: str) -> str:
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"""Extract module name from import node."""
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for child in node.children:
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if child.type in ("dotted_name", "module"):
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return content[child.start_byte : child.end_byte]
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return ""
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class JavaScriptParser(DependencyParser):
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"""Parser for JavaScript/TypeScript files using tree-sitter."""
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def __init__(self, typescript: bool = False):
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self._parser = None # type: ignore[assignment]
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self._typescript = typescript
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def _get_parser(self):
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if self._parser is None:
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if tree_sitter_javascript is None:
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raise ImportError("tree-sitter-javascript is not installed")
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if tree_sitter is None:
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raise ImportError("tree-sitter is not installed")
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lang = Language(tree_sitter_javascript.language()) # type: ignore[arg-type]
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self._parser = tree_sitter.Parser() # type: ignore[operator]
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self._parser.set_language(lang) # type: ignore[operator]
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return self._parser
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def get_language(self) -> str:
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return "typescript" if self._typescript else "javascript"
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def parse_file(self, file_path: Path) -> list[str]:
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"""Extract JavaScript/TypeScript imports from a file."""
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try:
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content = file_path.read_text(encoding="utf-8")
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except (UnicodeDecodeError, OSError):
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return []
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if tree_sitter is None or tree_sitter_javascript is None:
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return self._regex_parse(content)
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try:
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parser = self._get_parser()
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tree = parser.parse(bytes(content, "utf-8"))
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return self._extract_imports(tree.root_node, content)
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except Exception:
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return self._regex_parse(content)
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def _regex_parse(self, content: str) -> list[str]:
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"""Fallback regex-based parsing for JavaScript/TypeScript."""
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imports = []
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patterns = [
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(r'require\s*\(\s*["\']([^"\']+)["\']\s*\)', 1),
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(r'import\s+(?:\{[^}]*\}|\*\s+as\s+\w+|\w+)\s+from\s+["\']([^"\']+)["\']', 1),
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(r'import\s+["\']([^"\']+)["\']', 1),
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]
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for pattern, group in patterns:
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for match in re.finditer(pattern, content):
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module = match.group(group)
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if module and not module.startswith("."):
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imports.append(module.split("/")[0])
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return list(set(imports))
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def _extract_imports(
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self, node: tree_sitter.Node, content: str
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) -> list[str]:
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"""Extract imports from tree-sitter parse tree."""
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imports = []
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if node.type in ("import_statement", "call_expression"):
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import_str = content[node.start_byte : node.end_byte]
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if "require" in import_str:
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match = re.search(r'require\s*\(\s*["\']([^"\']+)["\']\s*\)', import_str)
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if match:
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module = match.group(1)
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if not module.startswith("."):
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imports.append(module.split("/")[0])
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elif "import" in import_str:
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match = re.search(
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r'from\s+["\']([^"\']+)["\']', import_str
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) or re.search(r'import\s+["\']([^"\']+)["\']', import_str)
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if match:
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module = match.group(1)
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if not module.startswith("."):
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imports.append(module.split("/")[0])
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for child in node.children:
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imports.extend(self._extract_imports(child, content))
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return list(set(imports))
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class GoParser(DependencyParser):
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"""Parser for Go files using tree-sitter."""
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def __init__(self):
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self._parser = None # type: ignore[assignment]
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def _get_parser(self):
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if self._parser is None:
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if tree_sitter_go is None:
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raise ImportError("tree-sitter-go is not installed")
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if tree_sitter is None:
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raise ImportError("tree-sitter is not installed")
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lang = Language(tree_sitter_go.language()) # type: ignore[arg-type]
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self._parser = tree_sitter.Parser() # type: ignore[operator]
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self._parser.set_language(lang) # type: ignore[operator]
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return self._parser
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def get_language(self) -> str:
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return "go"
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def parse_file(self, file_path: Path) -> list[str]:
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"""Extract Go imports from a file."""
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try:
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content = file_path.read_text(encoding="utf-8")
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except (UnicodeDecodeError, OSError):
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return []
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if tree_sitter is None or tree_sitter_go is None:
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return self._regex_parse(content)
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try:
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parser = self._get_parser()
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tree = parser.parse(bytes(content, "utf-8"))
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return self._extract_imports(tree.root_node, content)
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except Exception:
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return self._regex_parse(content)
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def _regex_parse(self, content: str) -> list[str]:
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"""Fallback regex-based parsing for Go."""
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imports = []
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import_block = re.search(
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r'\(\s*([\s\S]*?)\s*\)', content, re.MULTILINE
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)
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if import_block:
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import_lines = import_block.group(1).strip().split("\n")
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for line in import_lines:
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line = line.strip().strip('"')
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if line and not line.startswith("."):
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parts = line.split("/")
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if len(parts) >= 2:
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imports.append(f"{parts[0]}/{parts[1]}")
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elif parts:
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imports.append(parts[0])
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return list(set(imports))
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def _extract_imports(
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self, node: tree_sitter.Node, content: str
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) -> list[str]:
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"""Extract imports from tree-sitter parse tree."""
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imports = []
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if node.type == "import_declaration":
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import_str = content[node.start_byte : node.end_byte]
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match = re.search(r'"([^"]+)"', import_str)
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if match:
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module = match.group(1)
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if not module.startswith("."):
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parts = module.split("/")
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if len(parts) >= 2:
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imports.append(f"{parts[0]}/{parts[1]}")
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elif parts:
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imports.append(parts[0])
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for child in node.children:
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imports.extend(self._extract_imports(child, content))
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return list(set(imports))
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def get_parser(language: str) -> DependencyParser:
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"""Factory function to get the appropriate parser for a language."""
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parsers: dict[str, type[DependencyParser] | Callable[[], DependencyParser]] = {
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"python": PythonParser,
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"javascript": JavaScriptParser,
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"typescript": lambda: JavaScriptParser(typescript=True),
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"go": GoParser,
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}
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parser_class = parsers.get(language.lower())
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if parser_class is None:
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raise ValueError(f"Unsupported language: {language}")
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return parser_class() # type: ignore[no-any-return]
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def detect_language(file_path: Path) -> Optional[str]:
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"""Detect the language of a file based on its extension."""
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ext_map = {
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".py": "python",
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".js": "javascript",
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".jsx": "javascript",
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".ts": "typescript",
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".tsx": "typescript",
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".go": "go",
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}
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return ext_map.get(file_path.suffix.lower())
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def parse_dependencies(
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file_path: Path, language: Optional[str] = None
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) -> list[str]:
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"""Parse dependencies from a file."""
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if language is None:
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language = detect_language(file_path)
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if language is None:
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return []
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parser = get_parser(language)
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return parser.parse_file(file_path)
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