There's also a pattern matching implementation here.
"""
+# mypy: allow-untyped-defs
+
+from typing import (
+ Any,
+ Callable,
+ Dict,
+ Iterator,
+ List,
+ Optional,
+ Text,
+ Tuple,
+ TypeVar,
+ Union,
+ Set,
+ Iterable,
+ Sequence,
+)
+from blib2to3.pgen2.grammar import Grammar
+
__author__ = "Guido van Rossum <guido@python.org>"
import sys
from io import StringIO
-HUGE = 0x7FFFFFFF # maximum repeat count, default max
+HUGE: int = 0x7FFFFFFF # maximum repeat count, default max
+
+_type_reprs: Dict[int, Union[Text, int]] = {}
+
-_type_reprs = {}
-def type_repr(type_num):
+def type_repr(type_num: int) -> Union[Text, int]:
global _type_reprs
if not _type_reprs:
from .pygram import python_symbols
+
# printing tokens is possible but not as useful
# from .pgen2 import token // token.__dict__.items():
- for name, val in python_symbols.__dict__.items():
- if type(val) == int: _type_reprs[val] = name
+ for name in dir(python_symbols):
+ val = getattr(python_symbols, name)
+ if type(val) == int:
+ _type_reprs[val] = name
return _type_reprs.setdefault(type_num, type_num)
+
+_P = TypeVar("_P")
+
+NL = Union["Node", "Leaf"]
+Context = Tuple[Text, Tuple[int, int]]
+RawNode = Tuple[int, Optional[Text], Optional[Context], Optional[List[NL]]]
+
+
class Base(object):
"""
"""
# Default values for instance variables
- type = None # int: token number (< 256) or symbol number (>= 256)
- parent = None # Parent node pointer, or None
- children = () # Tuple of subnodes
- was_changed = False
- was_checked = False
+ type: int # int: token number (< 256) or symbol number (>= 256)
+ parent: Optional["Node"] = None # Parent node pointer, or None
+ children: List[NL] # List of subnodes
+ was_changed: bool = False
+ was_checked: bool = False
def __new__(cls, *args, **kwds):
"""Constructor that prevents Base from being instantiated."""
assert cls is not Base, "Cannot instantiate Base"
return object.__new__(cls)
- def __eq__(self, other):
+ def __eq__(self, other: Any) -> bool:
"""
Compare two nodes for equality.
return NotImplemented
return self._eq(other)
- __hash__ = None # For Py3 compatibility.
+ __hash__ = None # type: Any # For Py3 compatibility.
+
+ @property
+ def prefix(self) -> Text:
+ raise NotImplementedError
- def _eq(self, other):
+ def _eq(self: _P, other: _P) -> bool:
"""
Compare two nodes for equality.
"""
raise NotImplementedError
- def clone(self):
+ def clone(self: _P) -> _P:
"""
Return a cloned (deep) copy of self.
"""
raise NotImplementedError
- def post_order(self):
+ def post_order(self) -> Iterator[NL]:
"""
Return a post-order iterator for the tree.
"""
raise NotImplementedError
- def pre_order(self):
+ def pre_order(self) -> Iterator[NL]:
"""
Return a pre-order iterator for the tree.
"""
raise NotImplementedError
- def replace(self, new):
+ def replace(self, new: Union[NL, List[NL]]) -> None:
"""Replace this node with a new one in the parent."""
assert self.parent is not None, str(self)
assert new is not None
else:
l_children.append(ch)
assert found, (self.children, self, new)
- self.parent.changed()
self.parent.children = l_children
+ self.parent.changed()
+ self.parent.invalidate_sibling_maps()
for x in new:
x.parent = self.parent
self.parent = None
- def get_lineno(self):
+ def get_lineno(self) -> Optional[int]:
"""Return the line number which generated the invocant node."""
node = self
while not isinstance(node, Leaf):
if not node.children:
- return
+ return None
node = node.children[0]
return node.lineno
- def changed(self):
+ def changed(self) -> None:
+ if self.was_changed:
+ return
if self.parent:
self.parent.changed()
self.was_changed = True
- def remove(self):
+ def remove(self) -> Optional[int]:
"""
Remove the node from the tree. Returns the position of the node in its
parent's children before it was removed.
if self.parent:
for i, node in enumerate(self.parent.children):
if node is self:
- self.parent.changed()
del self.parent.children[i]
+ self.parent.changed()
+ self.parent.invalidate_sibling_maps()
self.parent = None
return i
+ return None
@property
- def next_sibling(self):
+ def next_sibling(self) -> Optional[NL]:
"""
The node immediately following the invocant in their parent's children
list. If the invocant does not have a next sibling, it is None
if self.parent is None:
return None
- # Can't use index(); we need to test by identity
- for i, child in enumerate(self.parent.children):
- if child is self:
- try:
- return self.parent.children[i+1]
- except IndexError:
- return None
+ if self.parent.next_sibling_map is None:
+ self.parent.update_sibling_maps()
+ assert self.parent.next_sibling_map is not None
+ return self.parent.next_sibling_map[id(self)]
@property
- def prev_sibling(self):
+ def prev_sibling(self) -> Optional[NL]:
"""
The node immediately preceding the invocant in their parent's children
list. If the invocant does not have a previous sibling, it is None.
if self.parent is None:
return None
- # Can't use index(); we need to test by identity
- for i, child in enumerate(self.parent.children):
- if child is self:
- if i == 0:
- return None
- return self.parent.children[i-1]
+ if self.parent.prev_sibling_map is None:
+ self.parent.update_sibling_maps()
+ assert self.parent.prev_sibling_map is not None
+ return self.parent.prev_sibling_map[id(self)]
- def leaves(self):
+ def leaves(self) -> Iterator["Leaf"]:
for child in self.children:
yield from child.leaves()
- def depth(self):
+ def depth(self) -> int:
if self.parent is None:
return 0
return 1 + self.parent.depth()
- def get_suffix(self):
+ def get_suffix(self) -> Text:
"""
Return the string immediately following the invocant node. This is
effectively equivalent to node.next_sibling.prefix
next_sib = self.next_sibling
if next_sib is None:
return ""
- return next_sib.prefix
+ prefix = next_sib.prefix
+ return prefix
- if sys.version_info < (3, 0):
- def __str__(self):
- return str(self).encode("ascii")
class Node(Base):
"""Concrete implementation for interior nodes."""
- def __init__(self,type, children,
- context=None,
- prefix=None,
- fixers_applied=None):
+ fixers_applied: Optional[List[Any]]
+ used_names: Optional[Set[Text]]
+
+ def __init__(
+ self,
+ type: int,
+ children: List[NL],
+ context: Optional[Any] = None,
+ prefix: Optional[Text] = None,
+ fixers_applied: Optional[List[Any]] = None,
+ ) -> None:
"""
Initializer.
for ch in self.children:
assert ch.parent is None, repr(ch)
ch.parent = self
+ self.invalidate_sibling_maps()
if prefix is not None:
self.prefix = prefix
if fixers_applied:
else:
self.fixers_applied = None
- def __repr__(self):
+ def __repr__(self) -> Text:
"""Return a canonical string representation."""
- return "%s(%s, %r)" % (self.__class__.__name__,
- type_repr(self.type),
- self.children)
+ assert self.type is not None
+ return "%s(%s, %r)" % (
+ self.__class__.__name__,
+ type_repr(self.type),
+ self.children,
+ )
- def __unicode__(self):
+ def __str__(self) -> Text:
"""
Return a pretty string representation.
"""
return "".join(map(str, self.children))
- if sys.version_info > (3, 0):
- __str__ = __unicode__
-
- def _eq(self, other):
+ def _eq(self, other) -> bool:
"""Compare two nodes for equality."""
return (self.type, self.children) == (other.type, other.children)
- def clone(self):
+ def clone(self) -> "Node":
+ assert self.type is not None
"""Return a cloned (deep) copy of self."""
- return Node(self.type, [ch.clone() for ch in self.children],
- fixers_applied=self.fixers_applied)
+ return Node(
+ self.type,
+ [ch.clone() for ch in self.children],
+ fixers_applied=self.fixers_applied,
+ )
- def post_order(self):
+ def post_order(self) -> Iterator[NL]:
"""Return a post-order iterator for the tree."""
for child in self.children:
yield from child.post_order()
yield self
- def pre_order(self):
+ def pre_order(self) -> Iterator[NL]:
"""Return a pre-order iterator for the tree."""
yield self
for child in self.children:
yield from child.pre_order()
@property
- def prefix(self):
+ def prefix(self) -> Text:
"""
The whitespace and comments preceding this node in the input.
"""
return self.children[0].prefix
@prefix.setter
- def prefix(self, prefix):
+ def prefix(self, prefix) -> None:
if self.children:
self.children[0].prefix = prefix
- def set_child(self, i, child):
+ def set_child(self, i: int, child: NL) -> None:
"""
Equivalent to 'node.children[i] = child'. This method also sets the
child's parent attribute appropriately.
self.children[i].parent = None
self.children[i] = child
self.changed()
+ self.invalidate_sibling_maps()
- def insert_child(self, i, child):
+ def insert_child(self, i: int, child: NL) -> None:
"""
Equivalent to 'node.children.insert(i, child)'. This method also sets
the child's parent attribute appropriately.
child.parent = self
self.children.insert(i, child)
self.changed()
+ self.invalidate_sibling_maps()
- def append_child(self, child):
+ def append_child(self, child: NL) -> None:
"""
Equivalent to 'node.children.append(child)'. This method also sets the
child's parent attribute appropriately.
child.parent = self
self.children.append(child)
self.changed()
+ self.invalidate_sibling_maps()
+
+ def invalidate_sibling_maps(self) -> None:
+ self.prev_sibling_map: Optional[Dict[int, Optional[NL]]] = None
+ self.next_sibling_map: Optional[Dict[int, Optional[NL]]] = None
+
+ def update_sibling_maps(self) -> None:
+ _prev: Dict[int, Optional[NL]] = {}
+ _next: Dict[int, Optional[NL]] = {}
+ self.prev_sibling_map = _prev
+ self.next_sibling_map = _next
+ previous: Optional[NL] = None
+ for current in self.children:
+ _prev[id(current)] = previous
+ _next[id(previous)] = current
+ previous = current
+ _next[id(current)] = None
class Leaf(Base):
"""Concrete implementation for leaf nodes."""
# Default values for instance variables
+ value: Text
+ fixers_applied: List[Any]
+ bracket_depth: int
+ opening_bracket: "Leaf"
+ used_names: Optional[Set[Text]]
_prefix = "" # Whitespace and comments preceding this token in the input
- lineno = 0 # Line where this token starts in the input
- column = 0 # Column where this token tarts in the input
-
- def __init__(self, type, value,
- context=None,
- prefix=None,
- fixers_applied=[]):
+ lineno: int = 0 # Line where this token starts in the input
+ column: int = 0 # Column where this token starts in the input
+
+ def __init__(
+ self,
+ type: int,
+ value: Text,
+ context: Optional[Context] = None,
+ prefix: Optional[Text] = None,
+ fixers_applied: List[Any] = [],
+ ) -> None:
"""
Initializer.
Takes a type constant (a token number < 256), a string value, and an
optional context keyword argument.
"""
+
assert 0 <= type < 256, type
if context is not None:
self._prefix, (self.lineno, self.column) = context
self.value = value
if prefix is not None:
self._prefix = prefix
- self.fixers_applied = fixers_applied[:]
+ self.fixers_applied: Optional[List[Any]] = fixers_applied[:]
+ self.children = []
- def __repr__(self):
+ def __repr__(self) -> str:
"""Return a canonical string representation."""
from .pgen2.token import tok_name
- return "%s(%s, %r)" % (self.__class__.__name__,
- tok_name.get(self.type, self.type),
- self.value)
- def __unicode__(self):
+ assert self.type is not None
+ return "%s(%s, %r)" % (
+ self.__class__.__name__,
+ tok_name.get(self.type, self.type),
+ self.value,
+ )
+
+ def __str__(self) -> Text:
"""
Return a pretty string representation.
"""
return self.prefix + str(self.value)
- if sys.version_info > (3, 0):
- __str__ = __unicode__
-
- def _eq(self, other):
+ def _eq(self, other) -> bool:
"""Compare two nodes for equality."""
return (self.type, self.value) == (other.type, other.value)
- def clone(self):
+ def clone(self) -> "Leaf":
+ assert self.type is not None
"""Return a cloned (deep) copy of self."""
- return Leaf(self.type, self.value,
- (self.prefix, (self.lineno, self.column)),
- fixers_applied=self.fixers_applied)
-
- def leaves(self):
+ return Leaf(
+ self.type,
+ self.value,
+ (self.prefix, (self.lineno, self.column)),
+ fixers_applied=self.fixers_applied,
+ )
+
+ def leaves(self) -> Iterator["Leaf"]:
yield self
- def post_order(self):
+ def post_order(self) -> Iterator["Leaf"]:
"""Return a post-order iterator for the tree."""
yield self
- def pre_order(self):
+ def pre_order(self) -> Iterator["Leaf"]:
"""Return a pre-order iterator for the tree."""
yield self
@property
- def prefix(self):
+ def prefix(self) -> Text:
"""
The whitespace and comments preceding this token in the input.
"""
return self._prefix
@prefix.setter
- def prefix(self, prefix):
+ def prefix(self, prefix) -> None:
self.changed()
self._prefix = prefix
-def convert(gr, raw_node):
+
+def convert(gr: Grammar, raw_node: RawNode) -> NL:
"""
Convert raw node information to a Node or Leaf instance.
if children or type in gr.number2symbol:
# If there's exactly one child, return that child instead of
# creating a new node.
+ assert children is not None
if len(children) == 1:
return children[0]
return Node(type, children, context=context)
else:
- return Leaf(type, value, context=context)
+ return Leaf(type, value or "", context=context)
+
+
+_Results = Dict[Text, NL]
class BasePattern(object):
"""
# Defaults for instance variables
- type = None # Node type (token if < 256, symbol if >= 256)
- content = None # Optional content matching pattern
- name = None # Optional name used to store match in results dict
+ type: Optional[int]
+ type = None # Node type (token if < 256, symbol if >= 256)
+ content: Any = None # Optional content matching pattern
+ name: Optional[Text] = None # Optional name used to store match in results dict
def __new__(cls, *args, **kwds):
"""Constructor that prevents BasePattern from being instantiated."""
assert cls is not BasePattern, "Cannot instantiate BasePattern"
return object.__new__(cls)
- def __repr__(self):
+ def __repr__(self) -> Text:
+ assert self.type is not None
args = [type_repr(self.type), self.content, self.name]
while args and args[-1] is None:
del args[-1]
return "%s(%s)" % (self.__class__.__name__, ", ".join(map(repr, args)))
- def optimize(self):
+ def _submatch(self, node, results=None) -> bool:
+ raise NotImplementedError
+
+ def optimize(self) -> "BasePattern":
"""
A subclass can define this as a hook for optimizations.
"""
return self
- def match(self, node, results=None):
+ def match(self, node: NL, results: Optional[_Results] = None) -> bool:
"""
Does this pattern exactly match a node?
if self.type is not None and node.type != self.type:
return False
if self.content is not None:
- r = None
+ r: Optional[_Results] = None
if results is not None:
r = {}
if not self._submatch(node, r):
return False
if r:
+ assert results is not None
results.update(r)
if results is not None and self.name:
results[self.name] = node
return True
- def match_seq(self, nodes, results=None):
+ def match_seq(self, nodes: List[NL], results: Optional[_Results] = None) -> bool:
"""
Does this pattern exactly match a sequence of nodes?
return False
return self.match(nodes[0], results)
- def generate_matches(self, nodes):
+ def generate_matches(self, nodes: List[NL]) -> Iterator[Tuple[int, _Results]]:
"""
Generator yielding all matches for this pattern.
Default implementation for non-wildcard patterns.
"""
- r = {}
+ r: _Results = {}
if nodes and self.match(nodes[0], r):
yield 1, r
class LeafPattern(BasePattern):
-
- def __init__(self, type=None, content=None, name=None):
+ def __init__(
+ self,
+ type: Optional[int] = None,
+ content: Optional[Text] = None,
+ name: Optional[Text] = None,
+ ) -> None:
"""
Initializer. Takes optional type, content, and name.
self.content = content
self.name = name
- def match(self, node, results=None):
+ def match(self, node: NL, results=None):
"""Override match() to insist on a leaf node."""
if not isinstance(node, Leaf):
return False
class NodePattern(BasePattern):
- wildcards = False
+ wildcards: bool = False
- def __init__(self, type=None, content=None, name=None):
+ def __init__(
+ self,
+ type: Optional[int] = None,
+ content: Optional[Iterable[Text]] = None,
+ name: Optional[Text] = None,
+ ) -> None:
"""
Initializer. Takes optional type, content, and name.
assert type >= 256, type
if content is not None:
assert not isinstance(content, str), repr(content)
- content = list(content)
- for i, item in enumerate(content):
+ newcontent = list(content)
+ for i, item in enumerate(newcontent):
assert isinstance(item, BasePattern), (i, item)
if isinstance(item, WildcardPattern):
self.wildcards = True
self.type = type
- self.content = content
+ self.content = newcontent
self.name = name
- def _submatch(self, node, results=None):
+ def _submatch(self, node, results=None) -> bool:
"""
Match the pattern's content to the node's children.
except it always uses non-greedy matching.
"""
- def __init__(self, content=None, min=0, max=HUGE, name=None):
+ min: int
+ max: int
+
+ def __init__(
+ self,
+ content: Optional[Text] = None,
+ min: int = 0,
+ max: int = HUGE,
+ name: Optional[Text] = None,
+ ) -> None:
"""
Initializer.
"""
assert 0 <= min <= max <= HUGE, (min, max)
if content is not None:
- content = tuple(map(tuple, content)) # Protect against alterations
+ f = lambda s: tuple(s)
+ wrapped_content = tuple(map(f, content)) # Protect against alterations
# Check sanity of alternatives
- assert len(content), repr(content) # Can't have zero alternatives
- for alt in content:
- assert len(alt), repr(alt) # Can have empty alternatives
- self.content = content
+ assert len(wrapped_content), repr(
+ wrapped_content
+ ) # Can't have zero alternatives
+ for alt in wrapped_content:
+ assert len(alt), repr(alt) # Can have empty alternatives
+ self.content = wrapped_content
self.min = min
self.max = max
self.name = name
- def optimize(self):
+ def optimize(self) -> Any:
"""Optimize certain stacked wildcard patterns."""
subpattern = None
- if (self.content is not None and
- len(self.content) == 1 and len(self.content[0]) == 1):
+ if (
+ self.content is not None
+ and len(self.content) == 1
+ and len(self.content[0]) == 1
+ ):
subpattern = self.content[0][0]
if self.min == 1 and self.max == 1:
if self.content is None:
return NodePattern(name=self.name)
- if subpattern is not None and self.name == subpattern.name:
+ if subpattern is not None and self.name == subpattern.name:
return subpattern.optimize()
- if (self.min <= 1 and isinstance(subpattern, WildcardPattern) and
- subpattern.min <= 1 and self.name == subpattern.name):
- return WildcardPattern(subpattern.content,
- self.min*subpattern.min,
- self.max*subpattern.max,
- subpattern.name)
+ if (
+ self.min <= 1
+ and isinstance(subpattern, WildcardPattern)
+ and subpattern.min <= 1
+ and self.name == subpattern.name
+ ):
+ return WildcardPattern(
+ subpattern.content,
+ self.min * subpattern.min,
+ self.max * subpattern.max,
+ subpattern.name,
+ )
return self
- def match(self, node, results=None):
+ def match(self, node, results=None) -> bool:
"""Does this pattern exactly match a node?"""
return self.match_seq([node], results)
- def match_seq(self, nodes, results=None):
+ def match_seq(self, nodes, results=None) -> bool:
"""Does this pattern exactly match a sequence of nodes?"""
for c, r in self.generate_matches(nodes):
if c == len(nodes):
return True
return False
- def generate_matches(self, nodes):
+ def generate_matches(self, nodes) -> Iterator[Tuple[int, _Results]]:
"""
Generator yielding matches for a sequence of nodes.
if hasattr(sys, "getrefcount"):
sys.stderr = save_stderr
- def _iterative_matches(self, nodes):
+ def _iterative_matches(self, nodes) -> Iterator[Tuple[int, _Results]]:
"""Helper to iteratively yield the matches."""
nodelen = len(nodes)
if 0 >= self.min:
new_results.append((c0 + c1, r))
results = new_results
- def _bare_name_matches(self, nodes):
+ def _bare_name_matches(self, nodes) -> Tuple[int, _Results]:
"""Special optimized matcher for bare_name."""
count = 0
- r = {}
+ r = {} # type: _Results
done = False
max = len(nodes)
while not done and count < max:
count += 1
done = False
break
+ assert self.name is not None
r[self.name] = nodes[:count]
return count, r
- def _recursive_matches(self, nodes, count):
+ def _recursive_matches(self, nodes, count) -> Iterator[Tuple[int, _Results]]:
"""Helper to recursively yield the matches."""
assert self.content is not None
if count >= self.min:
if count < self.max:
for alt in self.content:
for c0, r0 in generate_matches(alt, nodes):
- for c1, r1 in self._recursive_matches(nodes[c0:], count+1):
+ for c1, r1 in self._recursive_matches(nodes[c0:], count + 1):
r = {}
r.update(r0)
r.update(r1)
class NegatedPattern(BasePattern):
-
- def __init__(self, content=None):
+ def __init__(self, content: Optional[Any] = None) -> None:
"""
Initializer.
assert isinstance(content, BasePattern), repr(content)
self.content = content
- def match(self, node):
+ def match(self, node, results=None) -> bool:
# We never match a node in its entirety
return False
- def match_seq(self, nodes):
+ def match_seq(self, nodes, results=None) -> bool:
# We only match an empty sequence of nodes in its entirety
return len(nodes) == 0
- def generate_matches(self, nodes):
+ def generate_matches(self, nodes) -> Iterator[Tuple[int, _Results]]:
if self.content is None:
# Return a match if there is an empty sequence
if len(nodes) == 0:
yield 0, {}
-def generate_matches(patterns, nodes):
+def generate_matches(
+ patterns: List[BasePattern], nodes: List[NL]
+) -> Iterator[Tuple[int, _Results]]:
"""
Generator yielding matches for a sequence of patterns and nodes.
(count, results) tuples where:
count: the entire sequence of patterns matches nodes[:count];
results: dict containing named submatches.
- """
+ """
if not patterns:
yield 0, {}
else:
r.update(r0)
r.update(r1)
yield c0 + c1, r
+
+
+_Convert = Callable[[Grammar, RawNode], Any]
projects / etc / vim.git / blobdiff