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364 lines
11 KiB
364 lines
11 KiB
from abc import abstractmethod, abstractproperty
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from parso._compatibility import utf8_repr, encoding, py_version
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def search_ancestor(node, *node_types):
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"""
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Recursively looks at the parents of a node and returns the first found node
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that matches node_types. Returns ``None`` if no matching node is found.
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:param node: The ancestors of this node will be checked.
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:param node_types: type names that are searched for.
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:type node_types: tuple of str
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"""
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while True:
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node = node.parent
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if node is None or node.type in node_types:
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return node
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class NodeOrLeaf(object):
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"""
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The base class for nodes and leaves.
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"""
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__slots__ = ()
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type = None
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'''
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The type is a string that typically matches the types of the grammar file.
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'''
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def get_root_node(self):
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"""
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Returns the root node of a parser tree. The returned node doesn't have
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a parent node like all the other nodes/leaves.
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"""
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scope = self
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while scope.parent is not None:
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scope = scope.parent
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return scope
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def get_next_sibling(self):
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"""
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Returns the node immediately following this node in this parent's
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children list. If this node does not have a next sibling, it is None
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"""
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# Can't use index(); we need to test by identity
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for i, child in enumerate(self.parent.children):
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if child is self:
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try:
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return self.parent.children[i + 1]
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except IndexError:
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return None
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def get_previous_sibling(self):
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"""
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Returns the node immediately preceding this node in this parent's
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children list. If this node does not have a previous sibling, it is
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None.
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"""
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# Can't use index(); we need to test by identity
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for i, child in enumerate(self.parent.children):
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if child is self:
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if i == 0:
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return None
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return self.parent.children[i - 1]
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def get_previous_leaf(self):
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"""
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Returns the previous leaf in the parser tree.
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Returns `None` if this is the first element in the parser tree.
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"""
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node = self
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while True:
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c = node.parent.children
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i = c.index(node)
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if i == 0:
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node = node.parent
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if node.parent is None:
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return None
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else:
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node = c[i - 1]
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break
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while True:
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try:
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node = node.children[-1]
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except AttributeError: # A Leaf doesn't have children.
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return node
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def get_next_leaf(self):
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"""
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Returns the next leaf in the parser tree.
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Returns None if this is the last element in the parser tree.
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"""
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node = self
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while True:
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c = node.parent.children
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i = c.index(node)
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if i == len(c) - 1:
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node = node.parent
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if node.parent is None:
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return None
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else:
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node = c[i + 1]
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break
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while True:
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try:
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node = node.children[0]
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except AttributeError: # A Leaf doesn't have children.
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return node
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@abstractproperty
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def start_pos(self):
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"""
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Returns the starting position of the prefix as a tuple, e.g. `(3, 4)`.
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:return tuple of int: (line, column)
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"""
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@abstractproperty
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def end_pos(self):
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"""
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Returns the end position of the prefix as a tuple, e.g. `(3, 4)`.
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:return tuple of int: (line, column)
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"""
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@abstractmethod
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def get_start_pos_of_prefix(self):
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"""
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Returns the start_pos of the prefix. This means basically it returns
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the end_pos of the last prefix. The `get_start_pos_of_prefix()` of the
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prefix `+` in `2 + 1` would be `(1, 1)`, while the start_pos is
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`(1, 2)`.
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:return tuple of int: (line, column)
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"""
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@abstractmethod
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def get_first_leaf(self):
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"""
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Returns the first leaf of a node or itself if this is a leaf.
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"""
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@abstractmethod
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def get_last_leaf(self):
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"""
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Returns the last leaf of a node or itself if this is a leaf.
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"""
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@abstractmethod
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def get_code(self, include_prefix=True):
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"""
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Returns the code that was input the input for the parser for this node.
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:param include_prefix: Removes the prefix (whitespace and comments) of
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e.g. a statement.
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"""
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class Leaf(NodeOrLeaf):
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'''
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Leafs are basically tokens with a better API. Leafs exactly know where they
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were defined and what text preceeds them.
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'''
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__slots__ = ('value', 'parent', 'line', 'column', 'prefix')
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def __init__(self, value, start_pos, prefix=''):
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self.value = value
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'''
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:py:func:`str` The value of the current token.
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'''
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self.start_pos = start_pos
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self.prefix = prefix
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'''
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:py:func:`str` Typically a mixture of whitespace and comments. Stuff
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that is syntactically irrelevant for the syntax tree.
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'''
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self.parent = None
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'''
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The parent :class:`BaseNode` of this leaf.
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'''
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@property
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def start_pos(self):
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return self.line, self.column
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@start_pos.setter
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def start_pos(self, value):
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self.line = value[0]
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self.column = value[1]
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def get_start_pos_of_prefix(self):
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previous_leaf = self.get_previous_leaf()
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if previous_leaf is None:
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return self.line - self.prefix.count('\n'), 0 # It's the first leaf.
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return previous_leaf.end_pos
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def get_first_leaf(self):
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return self
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def get_last_leaf(self):
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return self
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def get_code(self, include_prefix=True):
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if include_prefix:
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return self.prefix + self.value
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else:
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return self.value
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@property
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def end_pos(self):
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lines = self.value.split('\n')
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end_pos_line = self.line + len(lines) - 1
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# Check for multiline token
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if self.line == end_pos_line:
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end_pos_column = self.column + len(lines[-1])
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else:
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end_pos_column = len(lines[-1])
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return end_pos_line, end_pos_column
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@utf8_repr
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def __repr__(self):
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value = self.value
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if not value:
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value = self.type
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return "<%s: %s>" % (type(self).__name__, value)
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class TypedLeaf(Leaf):
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__slots__ = ('type',)
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def __init__(self, type, value, start_pos, prefix=''):
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super(TypedLeaf, self).__init__(value, start_pos, prefix)
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self.type = type
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class BaseNode(NodeOrLeaf):
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"""
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The super class for all nodes.
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A node has children, a type and possibly a parent node.
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"""
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__slots__ = ('children', 'parent')
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type = None
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def __init__(self, children):
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for c in children:
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c.parent = self
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self.children = children
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"""
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A list of :class:`NodeOrLeaf` child nodes.
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"""
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self.parent = None
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'''
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The parent :class:`BaseNode` of this leaf.
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None if this is the root node.
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'''
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@property
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def start_pos(self):
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return self.children[0].start_pos
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def get_start_pos_of_prefix(self):
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return self.children[0].get_start_pos_of_prefix()
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@property
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def end_pos(self):
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return self.children[-1].end_pos
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def _get_code_for_children(self, children, include_prefix):
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if include_prefix:
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return "".join(c.get_code() for c in children)
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else:
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first = children[0].get_code(include_prefix=False)
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return first + "".join(c.get_code() for c in children[1:])
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def get_code(self, include_prefix=True):
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return self._get_code_for_children(self.children, include_prefix)
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def get_leaf_for_position(self, position, include_prefixes=False):
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"""
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Get the :py:class:`parso.tree.Leaf` at ``position``
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:param tuple position: A position tuple, row, column. Rows start from 1
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:param bool include_prefixes: If ``False``, ``None`` will be returned if ``position`` falls
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on whitespace or comments before a leaf
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:return: :py:class:`parso.tree.Leaf` at ``position``, or ``None``
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"""
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def binary_search(lower, upper):
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if lower == upper:
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element = self.children[lower]
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if not include_prefixes and position < element.start_pos:
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# We're on a prefix.
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return None
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# In case we have prefixes, a leaf always matches
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try:
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return element.get_leaf_for_position(position, include_prefixes)
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except AttributeError:
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return element
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index = int((lower + upper) / 2)
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element = self.children[index]
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if position <= element.end_pos:
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return binary_search(lower, index)
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else:
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return binary_search(index + 1, upper)
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if not ((1, 0) <= position <= self.children[-1].end_pos):
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raise ValueError('Please provide a position that exists within this node.')
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return binary_search(0, len(self.children) - 1)
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def get_first_leaf(self):
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return self.children[0].get_first_leaf()
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def get_last_leaf(self):
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return self.children[-1].get_last_leaf()
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@utf8_repr
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def __repr__(self):
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code = self.get_code().replace('\n', ' ').strip()
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if not py_version >= 30:
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code = code.encode(encoding, 'replace')
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return "<%s: %s@%s,%s>" % \
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(type(self).__name__, code, self.start_pos[0], self.start_pos[1])
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class Node(BaseNode):
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"""Concrete implementation for interior nodes."""
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__slots__ = ('type',)
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def __init__(self, type, children):
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super(Node, self).__init__(children)
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self.type = type
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def __repr__(self):
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return "%s(%s, %r)" % (self.__class__.__name__, self.type, self.children)
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class ErrorNode(BaseNode):
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"""
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A node that contains valid nodes/leaves that we're follow by a token that
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was invalid. This basically means that the leaf after this node is where
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Python would mark a syntax error.
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"""
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__slots__ = ()
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type = 'error_node'
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class ErrorLeaf(Leaf):
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"""
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A leaf that is either completely invalid in a language (like `$` in Python)
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or is invalid at that position. Like the star in `1 +* 1`.
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"""
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__slots__ = ('token_type',)
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type = 'error_leaf'
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def __init__(self, token_type, value, start_pos, prefix=''):
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super(ErrorLeaf, self).__init__(value, start_pos, prefix)
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self.token_type = token_type
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def __repr__(self):
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return "<%s: %s:%s, %s>" % \
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(type(self).__name__, self.token_type, repr(self.value), self.start_pos)
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