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# encoding: utf-8
"""Extracting and changing portions of the current line
All functions take cursor offset from the beginning of the line and the line of
Python code, and return None, or a tuple of the start index, end index, and the
word."""
from __future__ import unicode_literals, absolute_import
from itertools import chain
from collections import namedtuple
from .lazyre import LazyReCompile
LinePart = namedtuple('LinePart', ['start', 'stop', 'word'])
current_word_re = LazyReCompile(
r'(?<![)\]\w_.])'
r'([\w_][\w0-9._]*[(]?)')
def current_word(cursor_offset, line):
"""the object.attribute.attribute just before or under the cursor"""
pos = cursor_offset
matches = current_word_re.finditer(line)
start = pos
end = pos
word = None
for m in matches:
if m.start(1) < pos and m.end(1) >= pos:
start = m.start(1)
end = m.end(1)
word = m.group(1)
if word is None:
return None
return LinePart(start, end, word)
current_dict_key_re = LazyReCompile(r'''[\w_][\w0-9._]*\[([\w0-9._(), '"]*)''')
def current_dict_key(cursor_offset, line):
"""If in dictionary completion, return the current key"""
matches = current_dict_key_re.finditer(line)
for m in matches:
if m.start(1) <= cursor_offset and m.end(1) >= cursor_offset:
return LinePart(m.start(1), m.end(1), m.group(1))
return None
current_dict_re = LazyReCompile(r'''([\w_][\w0-9._]*)\[([\w0-9._(), '"]*)''')
def current_dict(cursor_offset, line):
"""If in dictionary completion, return the dict that should be used"""
matches = current_dict_re.finditer(line)
for m in matches:
if m.start(2) <= cursor_offset and m.end(2) >= cursor_offset:
return LinePart(m.start(1), m.end(1), m.group(1))
return None
current_string_re = LazyReCompile(
'''(?P<open>(?:""")|"|(?:''\')|')(?:((?P<closed>.+?)(?P=open))|'''
'''(?P<unclosed>.+))''')
def current_string(cursor_offset, line):
"""If inside a string of nonzero length, return the string (excluding
quotes)
Weaker than bpython.Repl's current_string, because that checks that a
string is a string based on previous lines in the buffer."""
for m in current_string_re.finditer(line):
i = 3 if m.group(3) else 4
if m.start(i) <= cursor_offset and m.end(i) >= cursor_offset:
return LinePart(m.start(i), m.end(i), m.group(i))
return None
current_object_re = LazyReCompile(r'([\w_][\w0-9_]*)[.]')
def current_object(cursor_offset, line):
"""If in attribute completion, the object on which attribute should be
looked up."""
match = current_word(cursor_offset, line)
if match is None:
return None
start, end, word = match
matches = current_object_re.finditer(word)
s = ''
for m in matches:
if m.end(1) + start < cursor_offset:
if s:
s += '.'
s += m.group(1)
if not s:
return None
return LinePart(start, start + len(s), s)
current_object_attribute_re = LazyReCompile(r'([\w_][\w0-9_]*)[.]?')
def current_object_attribute(cursor_offset, line):
"""If in attribute completion, the attribute being completed"""
# TODO replace with more general current_expression_attribute
match = current_word(cursor_offset, line)
if match is None:
return None
start, end, word = match
matches = current_object_attribute_re.finditer(word)
next(matches)
for m in matches:
if (m.start(1) + start <= cursor_offset and
m.end(1) + start >= cursor_offset):
return LinePart(m.start(1) + start, m.end(1) + start, m.group(1))
return None
current_from_import_from_re = LazyReCompile(
r'from ([\w0-9_.]*)(?:\s+import\s+([\w0-9_]+[,]?\s*)+)*')
def current_from_import_from(cursor_offset, line):
"""If in from import completion, the word after from
returns None if cursor not in or just after one of the two interesting
parts of an import: from (module) import (name1, name2)
"""
# TODO allow for as's
tokens = line.split()
if not ('from' in tokens or 'import' in tokens):
return None
matches = current_from_import_from_re.finditer(line)
for m in matches:
if ((m.start(1) < cursor_offset and m.end(1) >= cursor_offset) or
(m.start(2) < cursor_offset and m.end(2) >= cursor_offset)):
return LinePart(m.start(1), m.end(1), m.group(1))
return None
current_from_import_import_re_1 = LazyReCompile(r'from\s([\w0-9_.]*)\s+import')
current_from_import_import_re_2 = LazyReCompile(r'([\w0-9_]+)')
current_from_import_import_re_3 = LazyReCompile(r'[,][ ]([\w0-9_]*)')
def current_from_import_import(cursor_offset, line):
"""If in from import completion, the word after import being completed
returns None if cursor not in or just after one of these words
"""
baseline = current_from_import_import_re_1.search(line)
if baseline is None:
return None
match1 = current_from_import_import_re_2.search(line[baseline.end():])
if match1 is None:
return None
matches = current_from_import_import_re_3.finditer(line[baseline.end():])
for m in chain((match1, ), matches):
start = baseline.end() + m.start(1)
end = baseline.end() + m.end(1)
if start < cursor_offset and end >= cursor_offset:
return LinePart(start, end, m.group(1))
return None
current_import_re_1 = LazyReCompile(r'import')
current_import_re_2 = LazyReCompile(r'([\w0-9_.]+)')
current_import_re_3 = LazyReCompile(r'[,][ ]([\w0-9_.]*)')
def current_import(cursor_offset, line):
# TODO allow for multiple as's
baseline = current_import_re_1.search(line)
if baseline is None:
return None
match1 = current_import_re_2.search(line[baseline.end():])
if match1 is None:
return None
matches = current_import_re_3.finditer(line[baseline.end():])
for m in chain((match1, ), matches):
start = baseline.end() + m.start(1)
end = baseline.end() + m.end(1)
if start < cursor_offset and end >= cursor_offset:
return LinePart(start, end, m.group(1))
current_method_definition_name_re = LazyReCompile("def\s+([a-zA-Z_][\w]*)")
def current_method_definition_name(cursor_offset, line):
"""The name of a method being defined"""
matches = current_method_definition_name_re.finditer(line)
for m in matches:
if (m.start(1) <= cursor_offset and m.end(1) >= cursor_offset):
return LinePart(m.start(1), m.end(1), m.group(1))
return None
current_single_word_re = LazyReCompile(r"(?<![.])\b([a-zA-Z_][\w]*)")
def current_single_word(cursor_offset, line):
"""the un-dotted word just before or under the cursor"""
matches = current_single_word_re.finditer(line)
for m in matches:
if m.start(1) <= cursor_offset and m.end(1) >= cursor_offset:
return LinePart(m.start(1), m.end(1), m.group(1))
return None
def current_dotted_attribute(cursor_offset, line):
"""The dotted attribute-object pair before the cursor"""
match = current_word(cursor_offset, line)
if match is None:
return None
start, end, word = match
if '.' in word[1:]:
return LinePart(start, end, word)
current_expression_attribute_re = LazyReCompile(
r'[.]\s*((?:[\w_][\w0-9_]*)|(?:))')
def current_expression_attribute(cursor_offset, line):
"""If after a dot, the attribute being completed"""
# TODO replace with more general current_expression_attribute
matches = current_expression_attribute_re.finditer(line)
for m in matches:
if (m.start(1) <= cursor_offset and m.end(1) >= cursor_offset):
return LinePart(m.start(1), m.end(1), m.group(1))
return None