def evaluate_current_attribute(cursor_offset, line, namespace=None):
"""Safely evaluates the expression having an attributed accesssed"""
# this function runs user code in case of custom descriptors,
# so could fail in any way
obj = evaluate_current_expression(cursor_offset, line, namespace)
attr = line_properties.current_expression_attribute(cursor_offset, line)
if attr is None:
raise EvaluationError("No attribute found to look up")
try:
return getattr(obj, attr.word)
except AttributeError:
raise EvaluationError("can't lookup attribute %s on %r" %
(attr.word, obj))
def evaluate_current_attribute(cursor_offset, line, namespace=None):
"""Safely evaluates the expression having an attributed accesssed"""
# this function runs user code in case of custom descriptors,
# so could fail in any way
obj = evaluate_current_expression(cursor_offset, line, namespace)
attr = line_properties.current_expression_attribute(cursor_offset, line)
if attr is None:
raise EvaluationError("No attribute found to look up")
try:
return getattr(obj, attr.word)
except AttributeError:
raise EvaluationError(
"can't lookup attribute %s on %r" % (attr.word, obj))
def evaluate_current_expression(cursor_offset, line, namespace=None):
"""
Return evaluated expression to the right of the dot of current attribute.
Only evaluates builtin objects, and do any attribute lookup.
"""
# Builds asts from with increasing numbers of characters back from cursor.
# Find the biggest valid ast.
# Once our attribute access is found, return its .value subtree
if namespace is None:
namespace = {}
# in case attribute is blank, e.g. foo.| -> foo.xxx|
temp_line = line[:cursor_offset] + 'xxx' + line[cursor_offset:]
temp_cursor = cursor_offset + 3
temp_attribute = line_properties.current_expression_attribute(
temp_cursor, temp_line)
if temp_attribute is None:
raise EvaluationError("No current attribute")
attr_before_cursor = temp_line[temp_attribute.start:temp_cursor]
def parse_trees(cursor_offset, line):
for i in range(cursor_offset - 1, -1, -1):
try:
tree = ast.parse(line[i:cursor_offset])
yield tree
except SyntaxError:
continue
largest_ast = None
for tree in parse_trees(temp_cursor, temp_line):
attribute_access = find_attribute_with_name(tree, attr_before_cursor)
if attribute_access:
largest_ast = attribute_access.value
if largest_ast is None:
raise EvaluationError(
"Corresponding ASTs to right of cursor are invalid")
try:
return simple_eval(largest_ast, namespace)
except ValueError:
raise EvaluationError("Could not safely evaluate")
def evaluate_current_expression(cursor_offset, line, namespace=None):
"""
Return evaluated expression to the right of the dot of current attribute.
Only evaluates builtin objects, and do any attribute lookup.
"""
# Builds asts from with increasing numbers of characters back from cursor.
# Find the biggest valid ast.
# Once our attribute access is found, return its .value subtree
if namespace is None:
namespace = {}
# in case attribute is blank, e.g. foo.| -> foo.xxx|
temp_line = line[:cursor_offset] + 'xxx' + line[cursor_offset:]
temp_cursor = cursor_offset + 3
temp_attribute = line_properties.current_expression_attribute(
temp_cursor, temp_line)
if temp_attribute is None:
raise EvaluationError("No current attribute")
attr_before_cursor = temp_line[temp_attribute.start:temp_cursor]
def parse_trees(cursor_offset, line):
for i in range(cursor_offset - 1, -1, -1):
try:
tree = ast.parse(line[i:cursor_offset])
yield tree
except SyntaxError:
continue
largest_ast = None
for tree in parse_trees(temp_cursor, temp_line):
attribute_access = find_attribute_with_name(tree, attr_before_cursor)
if attribute_access:
largest_ast = attribute_access.value
if largest_ast is None:
raise EvaluationError(
"Corresponding ASTs to right of cursor are invalid")
try:
return simple_eval(largest_ast, namespace)
except ValueError:
raise EvaluationError("Could not safely evaluate")
def locate(self, current_offset, line):
return lineparts.current_expression_attribute(current_offset, line)
def locate(self, current_offset, line):
return lineparts.current_expression_attribute(current_offset, line)
