Snippets
Created by
Василий Шередеко
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from __future__ import annotations
import abc
import ast
import dataclasses
import os
import sys
from typing import Sequence, TypeVar, List, cast, Union
import multidict
import multimethod
T = TypeVar('T')
def unique_sequence(sequence: Sequence[T]) -> List[T]:
seen = set()
seen_add = seen.add
return [x for x in sequence if not (x in seen or seen_add(x))]
# noinspection PyPep8Naming
class cached_property(object):
def __init__(self, func):
self.func = func
def __get__(self, instance, cls=None):
if instance is not None:
result = instance.__dict__[self.func.__name__] = self.func(instance)
return result
return None # ABC
@dataclasses.dataclass
class Position:
# Line position in a document (one-based).
line: int = 1
# Character offset on a line in a document (one-based).
column: int = 1
@staticmethod
def __add(lhs: int, rhs: int, min: int) -> int:
"""Compute max(min, lhs+rhs) (provided min <= lhs)."""
return rhs + lhs if 0 < rhs or -rhs < lhs else min
def lines(self, count: int = 1) -> Position:
"""(line related) Advance to the COUNT next lines."""
if count:
line = self.__add(self.line, count, 1)
return Position(line, 1)
return self
def columns(self, count: int = 1) -> Position:
"""(column related) Advance to the COUNT next columns."""
column = self.__add(self.column, count, 1)
return Position(self.line, column)
def __str__(self) -> str:
return f"{self.line}:{self.column}"
@dataclasses.dataclass
class Location:
# The location's filename
filename: str
# The location's begin position.
begin: Position = Position()
# The end's begin position.
end: Position = Position()
def step(self) -> Location:
"""Reset initial location to final location."""
return Location(self.filename, self.end, self.end)
def columns(self, count: int = 1) -> Location:
"""Extend the current location to the COUNT next columns."""
end = self.end.columns(count)
return Location(self.filename, self.begin, end)
def lines(self, count: int = 1) -> Location:
"""Extend the current location to the COUNT next lines."""
end = self.end.lines(count)
return Location(self.filename, self.begin, end)
def __add__(self, other: Location) -> Location:
return Location(self.filename, self.begin, other.end)
def __str__(self) -> str:
if self.begin == self.end:
return f"{self.filename}:{self.begin}"
elif self.begin.line == self.end.line:
return f"{self.filename}:{self.begin}-{self.end.column}"
else:
return f"{self.filename}:{self.begin}-{self.end}"
class Context:
def __init__(self):
self.__paths = unique_sequence([
os.path.join(os.getcwd(), 'stdlib'),
os.path.dirname(os.path.abspath(__file__))
])
self.__filenames = {}
self.__modules = {}
print(self.__paths)
@staticmethod
def get_filename(module_name: str) -> str:
filename = module_name.replace('.', os.path.sep) + '.orx'
return filename
@staticmethod
def get_module_name(filename: str) -> str:
module_name, _ = os.path.splitext(filename)
module_name = module_name.replace(os.path.sep, '.')
return module_name
@cached_property
def builtins_module(self) -> Module:
return self.load('__builtins__')
def open(self, filename: str, *, name: str = None) -> Module:
fullname = os.path.abspath(filename)
if fullname in self.__filenames:
model = self.__filenames[fullname]
else:
with open(filename, 'r', encoding='utf-8') as stream:
tree = ast.parse(stream.read(), filename)
name = name or self.get_module_name(filename)
model = Model(self, tree, name, filename)
self.__filenames[fullname] = model
model.analyze()
return model.module
def load(self, name: str) -> Module:
filename = self.get_filename(name)
for path in self.__paths:
fullname = os.path.join(path, filename)
if os.path.exists(fullname):
return self.open(fullname, name=name)
raise RuntimeError(f'Module `{name}` is not found')
class Model:
def __init__(self, context: Context, tree: ast.Module, name: str, filename: str):
self.context = context
self.tree = tree
self.name = name
self.filename = filename
self.__symbols = {}
@property
def module(self) -> Module:
return cast(Module, self.get_symbol(self.tree))
def get_symbol(self, node: ast.AST) -> Union[Member, Container]:
if node not in self.__symbols:
self.__symbols[node] = self.annotate_node(node)
return self.__symbols[node]
def analyze(self):
# Define types
for member in self.tree.body:
if isinstance(member, ast.ClassDef):
self.get_symbol(member)
@multimethod.multimethod
def annotate_node(self: Model, node: ast.AST):
class_name = type(node).__name__
raise NotImplementedError(f'Not found annotate method for class {class_name}')
@multimethod.multimethod
def annotate_node(self: Model, node: ast.Module) -> Module:
return Module(self.context, self.name, self.filename)
@multimethod.multimethod
def annotate_node(self: Model, node: ast.ClassDef) -> Type:
if self.module is self.context.builtins_module:
if node.name == 'str':
return StringType(self.module)
elif node.name == 'int':
return IntegerType(self.module)
elif node.name == 'bool':
return BooleanType(self.module)
print(self.module)
print(self.context.builtins_module)
raise NotImplementedError
class Container:
def __init__(self):
self.__members = []
self.__scope = multidict.MultiDict()
@property
def members(self) -> Sequence[Member]:
return self.__members
def add_member(self, member: Member):
self.__members.append(member)
self.__scope.add(member.name, member)
def find_member(self, name: str) -> Union[None, Member, Sequence[Function]]:
members = self.__scope.getall(name)
if members:
first_member = members[0]
if isinstance(first_member, Function):
return members
return first_member
return None
class Member(abc.ABC):
@property
@abc.abstractmethod
def name(self) -> str:
raise NotImplementedError
@property
@abc.abstractmethod
def owner(self) -> Container:
raise NotImplementedError
@property
def module(self) -> Module:
if isinstance(self.owner, Module):
return cast(Module, self.owner)
return cast(Member, self.owner).module
class Module(Container):
def __init__(self, context: Context, name: str, filename: str):
super(Module, self).__init__()
self.context = context
self.name = name
self.filename = filename
self.owner = None
self.__types = []
self.__functions = []
def __str__(self):
return self.name
def add_type(self, clazz: Type):
self.__types.append(clazz)
def add_function(self, func: Function):
self.__functions.append(func)
class Type(Member, Container):
def __init__(self, owner: Container, name: str):
super(Type, self).__init__()
self.__owner = owner
self.__name = name
self.owner.add_member(self)
self.module.add_type(self)
@property
def name(self) -> str:
return self.__name
@property
def owner(self) -> Container:
return self.__owner
class BooleanType(Type):
def __init__(self, owner: Module):
super().__init__(owner, 'bool')
class IntegerType(Type):
def __init__(self, owner: Module):
super().__init__(owner, 'int')
class StringType(Type):
def __init__(self, owner: Module):
super().__init__(owner, 'str')
class Function(Member):
def __init__(self, owner: Container, name: str):
self.__name = name
self.__owner = owner
self.owner.add_member(self)
self.module.add_function(self)
@property
def name(self) -> str:
return self.__name
@property
def owner(self) -> Container:
return self.__owner
def main():
context = Context()
module = context.open(sys.argv[1])
print(module.name, module.filename)
breakpoint()
if __name__ == '__main__':
main()
|
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