mirror of
https://github.com/davidhalter/jedi.git
synced 2026-02-21 13:08:28 +08:00
Separate the python syntax tree stuff from the non python stuff.
This commit is contained in:
Dave Halter
@@ -0,0 +1,353 @@
|
||||
from jedi._compatibility import utf8_repr, encoding, is_py3
|
||||
|
||||
|
||||
class _NodeOrLeaf(object):
|
||||
"""
|
||||
This is just here to have an isinstance check, which is also used on
|
||||
evaluate classes. But since they have sometimes a special type of
|
||||
delegation, it is important for those classes to override this method.
|
||||
|
||||
I know that there is a chance to do such things with __instancecheck__, but
|
||||
since Python 2.5 doesn't support it, I decided to do it this way.
|
||||
"""
|
||||
__slots__ = ()
|
||||
|
||||
def get_root_node(self):
|
||||
scope = self
|
||||
while scope.parent is not None:
|
||||
scope = scope.parent
|
||||
return scope
|
||||
|
||||
def get_next_sibling(self):
|
||||
"""
|
||||
The node immediately following the invocant in their parent's children
|
||||
list. If the invocant does not have a next sibling, it is 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
|
||||
|
||||
def get_previous_sibling(self):
|
||||
"""
|
||||
The node/leaf immediately preceding the invocant in their parent's
|
||||
children list. If the invocant does not have a previous sibling, it is
|
||||
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]
|
||||
|
||||
def get_previous_leaf(self):
|
||||
"""
|
||||
Returns the previous leaf in the parser tree.
|
||||
Raises an IndexError if it's the first element.
|
||||
"""
|
||||
node = self
|
||||
while True:
|
||||
c = node.parent.children
|
||||
i = c.index(node)
|
||||
if i == 0:
|
||||
node = node.parent
|
||||
if node.parent is None:
|
||||
return None
|
||||
else:
|
||||
node = c[i - 1]
|
||||
break
|
||||
|
||||
while True:
|
||||
try:
|
||||
node = node.children[-1]
|
||||
except AttributeError: # A Leaf doesn't have children.
|
||||
return node
|
||||
|
||||
def get_next_leaf(self):
|
||||
"""
|
||||
Returns the previous leaf in the parser tree.
|
||||
Raises an IndexError if it's the last element.
|
||||
"""
|
||||
node = self
|
||||
while True:
|
||||
c = node.parent.children
|
||||
i = c.index(node)
|
||||
if i == len(c) - 1:
|
||||
node = node.parent
|
||||
if node.parent is None:
|
||||
return None
|
||||
else:
|
||||
node = c[i + 1]
|
||||
break
|
||||
|
||||
while True:
|
||||
try:
|
||||
node = node.children[0]
|
||||
except AttributeError: # A Leaf doesn't have children.
|
||||
return node
|
||||
|
||||
|
||||
class Leaf(_NodeOrLeaf):
|
||||
__slots__ = ('value', 'parent', 'line', 'indent', 'prefix')
|
||||
|
||||
def __init__(self, value, start_pos, prefix=''):
|
||||
self.value = value
|
||||
self.start_pos = start_pos
|
||||
self.prefix = prefix
|
||||
self.parent = None
|
||||
|
||||
@property
|
||||
def start_pos(self):
|
||||
return self.line, self.indent
|
||||
|
||||
@start_pos.setter
|
||||
def start_pos(self, value):
|
||||
self.line = value[0]
|
||||
self.indent = value[1]
|
||||
|
||||
def get_start_pos_of_prefix(self):
|
||||
previous_leaf = self.get_previous_leaf()
|
||||
if previous_leaf is None:
|
||||
return self.line - self.prefix.count('\n'), 0 # It's the first leaf.
|
||||
return previous_leaf.end_pos
|
||||
|
||||
@property
|
||||
def end_pos(self):
|
||||
return self.line, self.indent + len(self.value)
|
||||
|
||||
def move(self, line_offset):
|
||||
self.line += line_offset
|
||||
|
||||
def get_first_leaf(self):
|
||||
return self
|
||||
|
||||
def get_last_leaf(self):
|
||||
return self
|
||||
|
||||
def get_code(self, normalized=False, include_prefix=True):
|
||||
if normalized:
|
||||
return self.value
|
||||
if include_prefix:
|
||||
return self.prefix + self.value
|
||||
else:
|
||||
return self.value
|
||||
|
||||
def nodes_to_execute(self, last_added=False):
|
||||
return []
|
||||
|
||||
@utf8_repr
|
||||
def __repr__(self):
|
||||
return "<%s: %s start=%s>" % (type(self).__name__, self.value, self.start_pos)
|
||||
|
||||
|
||||
class LeafWithNewlines(Leaf):
|
||||
__slots__ = ()
|
||||
|
||||
@property
|
||||
def end_pos(self):
|
||||
"""
|
||||
Literals and whitespace end_pos are more complicated than normal
|
||||
end_pos, because the containing newlines may change the indexes.
|
||||
"""
|
||||
lines = self.value.split('\n')
|
||||
end_pos_line = self.line + len(lines) - 1
|
||||
# Check for multiline token
|
||||
if self.line == end_pos_line:
|
||||
end_pos_indent = self.indent + len(lines[-1])
|
||||
else:
|
||||
end_pos_indent = len(lines[-1])
|
||||
return end_pos_line, end_pos_indent
|
||||
|
||||
@utf8_repr
|
||||
def __repr__(self):
|
||||
return "<%s: %r>" % (type(self).__name__, self.value)
|
||||
|
||||
|
||||
class BaseNode(_NodeOrLeaf):
|
||||
"""
|
||||
The super class for all nodes.
|
||||
|
||||
If you create custom nodes, you will probably want to inherit from this
|
||||
``BaseNode``.
|
||||
"""
|
||||
__slots__ = ('children', 'parent')
|
||||
type = None
|
||||
|
||||
def __init__(self, children):
|
||||
"""
|
||||
Initialize :class:`BaseNode`.
|
||||
|
||||
:param children: The module in which this Python object locates.
|
||||
"""
|
||||
for c in children:
|
||||
c.parent = self
|
||||
self.children = children
|
||||
self.parent = None
|
||||
|
||||
def move(self, line_offset):
|
||||
"""
|
||||
Move the Node's start_pos.
|
||||
"""
|
||||
for c in self.children:
|
||||
c.move(line_offset)
|
||||
|
||||
@property
|
||||
def start_pos(self):
|
||||
return self.children[0].start_pos
|
||||
|
||||
def get_start_pos_of_prefix(self):
|
||||
return self.children[0].get_start_pos_of_prefix()
|
||||
|
||||
@property
|
||||
def end_pos(self):
|
||||
return self.children[-1].end_pos
|
||||
|
||||
def _get_code_for_children(self, children, normalized, include_prefix):
|
||||
# TODO implement normalized (depending on context).
|
||||
if include_prefix:
|
||||
return "".join(c.get_code(normalized) for c in children)
|
||||
else:
|
||||
first = children[0].get_code(include_prefix=False)
|
||||
return first + "".join(c.get_code(normalized) for c in children[1:])
|
||||
|
||||
def get_code(self, normalized=False, include_prefix=True):
|
||||
return self._get_code_for_children(self.children, normalized, include_prefix)
|
||||
|
||||
def get_leaf_for_position(self, position, include_prefixes=False):
|
||||
def binary_search(lower, upper):
|
||||
if lower == upper:
|
||||
element = self.children[lower]
|
||||
if not include_prefixes and position < element.start_pos:
|
||||
# We're on a prefix.
|
||||
return None
|
||||
# In case we have prefixes, a leaf always matches
|
||||
try:
|
||||
return element.get_leaf_for_position(position, include_prefixes)
|
||||
except AttributeError:
|
||||
return element
|
||||
|
||||
|
||||
index = int((lower + upper) / 2)
|
||||
element = self.children[index]
|
||||
if position <= element.end_pos:
|
||||
return binary_search(lower, index)
|
||||
else:
|
||||
return binary_search(index + 1, upper)
|
||||
|
||||
if not ((1, 0) <= position <= self.children[-1].end_pos):
|
||||
raise ValueError('Please provide a position that exists within this node.')
|
||||
return binary_search(0, len(self.children) - 1)
|
||||
|
||||
def get_first_leaf(self):
|
||||
return self.children[0].get_first_leaf()
|
||||
|
||||
def get_last_leaf(self):
|
||||
return self.children[-1].get_last_leaf()
|
||||
|
||||
def get_following_comment_same_line(self):
|
||||
"""
|
||||
returns (as string) any comment that appears on the same line,
|
||||
after the node, including the #
|
||||
"""
|
||||
try:
|
||||
if self.type == 'for_stmt':
|
||||
whitespace = self.children[5].get_first_leaf().prefix
|
||||
elif self.type == 'with_stmt':
|
||||
whitespace = self.children[3].get_first_leaf().prefix
|
||||
else:
|
||||
whitespace = self.get_last_leaf().get_next_leaf().prefix
|
||||
except AttributeError:
|
||||
return None
|
||||
except ValueError:
|
||||
# TODO in some particular cases, the tree doesn't seem to be linked
|
||||
# correctly
|
||||
return None
|
||||
if "#" not in whitespace:
|
||||
return None
|
||||
comment = whitespace[whitespace.index("#"):]
|
||||
if "\r" in comment:
|
||||
comment = comment[:comment.index("\r")]
|
||||
if "\n" in comment:
|
||||
comment = comment[:comment.index("\n")]
|
||||
return comment
|
||||
|
||||
@utf8_repr
|
||||
def __repr__(self):
|
||||
code = self.get_code().replace('\n', ' ').strip()
|
||||
if not is_py3:
|
||||
code = code.encode(encoding, 'replace')
|
||||
return "<%s: %s@%s,%s>" % \
|
||||
(type(self).__name__, code, self.start_pos[0], self.start_pos[1])
|
||||
|
||||
|
||||
class Node(BaseNode):
|
||||
"""Concrete implementation for interior nodes."""
|
||||
__slots__ = ('type',)
|
||||
|
||||
_IGNORE_EXECUTE_NODES = set([
|
||||
'suite', 'subscriptlist', 'subscript', 'simple_stmt', 'sliceop',
|
||||
'testlist_comp', 'dictorsetmaker', 'trailer', 'decorators',
|
||||
'decorated', 'arglist', 'argument', 'exprlist', 'testlist',
|
||||
'testlist_safe', 'testlist1'
|
||||
])
|
||||
|
||||
def __init__(self, type, children):
|
||||
"""
|
||||
Initializer.
|
||||
|
||||
Takes a type constant (a symbol number >= 256), a sequence of
|
||||
child nodes, and an optional context keyword argument.
|
||||
|
||||
As a side effect, the parent pointers of the children are updated.
|
||||
"""
|
||||
super(Node, self).__init__(children)
|
||||
self.type = type
|
||||
|
||||
def nodes_to_execute(self, last_added=False):
|
||||
"""
|
||||
For static analysis.
|
||||
"""
|
||||
result = []
|
||||
if self.type not in Node._IGNORE_EXECUTE_NODES and not last_added:
|
||||
result.append(self)
|
||||
last_added = True
|
||||
|
||||
for child in self.children:
|
||||
result += child.nodes_to_execute(last_added)
|
||||
return result
|
||||
|
||||
def __repr__(self):
|
||||
return "%s(%s, %r)" % (self.__class__.__name__, self.type, self.children)
|
||||
|
||||
|
||||
class ErrorNode(BaseNode):
|
||||
"""
|
||||
TODO doc
|
||||
"""
|
||||
__slots__ = ()
|
||||
type = 'error_node'
|
||||
|
||||
def nodes_to_execute(self, last_added=False):
|
||||
return []
|
||||
|
||||
|
||||
class ErrorLeaf(LeafWithNewlines):
|
||||
"""
|
||||
TODO doc
|
||||
"""
|
||||
__slots__ = ('original_type')
|
||||
type = 'error_leaf'
|
||||
|
||||
def __init__(self, original_type, value, start_pos, prefix=''):
|
||||
super(ErrorLeaf, self).__init__(value, start_pos, prefix)
|
||||
self.original_type = original_type
|
||||
|
||||
def __repr__(self):
|
||||
return "<%s: %s:%s, %s)>" % \
|
||||
(type(self).__name__, self.original_type, repr(self.value), self.start_pos)
|
||||
|
||||
|
||||
|
||||
Reference in New Issue
Block a user