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GeezerVison is showing github.com — pythonVSCode/pythonFiles/jedi/refactoring.py at master · dannyzed/pythonVSCode

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"""
Introduce some basic refactoring functions to |jedi|. This module is still in a
very early development stage and needs much testing and improvement.
.. warning:: I won't do too much here, but if anyone wants to step in, please
do. Refactoring is none of my priorities
It uses the |jedi| `API <plugin-api.html>`_ and supports currently the
following functions (sometimes bug-prone):
- rename
- extract variable
- inline variable
"""
import difflib
from jedi import common
from jedi.evaluate import helpers
from jedi.parser import tree as pt
class Refactoring(object):
def __init__(self, change_dct):
"""
:param change_dct: dict(old_path=(new_path, old_lines, new_lines))
"""
self.change_dct = change_dct
def old_files(self):
dct = {}
for old_path, (new_path, old_l, new_l) in self.change_dct.items():
dct[new_path] = '\n'.join(new_l)
return dct
def new_files(self):
dct = {}
for old_path, (new_path, old_l, new_l) in self.change_dct.items():
dct[new_path] = '\n'.join(new_l)
return dct
def diff(self):
texts = []
for old_path, (new_path, old_l, new_l) in self.change_dct.items():
if old_path:
udiff = difflib.unified_diff(old_l, new_l)
else:
udiff = difflib.unified_diff(old_l, new_l, old_path, new_path)
texts.append('\n'.join(udiff))
return '\n'.join(texts)
def rename(script, new_name):
""" The `args` / `kwargs` params are the same as in `api.Script`.
:param operation: The refactoring operation to execute.
:type operation: str
:type source: str
:return: list of changed lines/changed files
"""
return Refactoring(_rename(script.usages(), new_name))
def _rename(names, replace_str):
""" For both rename and inline. """
order = sorted(names, key=lambda x: (x.module_path, x.line, x.column),
reverse=True)
def process(path, old_lines, new_lines):
if new_lines is not None: # goto next file, save last
dct[path] = path, old_lines, new_lines
dct = {}
current_path = object()
new_lines = old_lines = None
for name in order:
if name.in_builtin_module():
continue
if current_path != name.module_path:
current_path = name.module_path
process(current_path, old_lines, new_lines)
if current_path is not None:
# None means take the source that is a normal param.
with open(current_path) as f:
source = f.read()
new_lines = common.splitlines(common.source_to_unicode(source))
old_lines = new_lines[:]
nr, indent = name.line, name.column
line = new_lines[nr - 1]
new_lines[nr - 1] = line[:indent] + replace_str + \
line[indent + len(name.name):]
process(current_path, old_lines, new_lines)
return dct
def extract(script, new_name):
""" The `args` / `kwargs` params are the same as in `api.Script`.
:param operation: The refactoring operation to execute.
:type operation: str
:type source: str
:return: list of changed lines/changed files
"""
new_lines = common.splitlines(common.source_to_unicode(script.source))
old_lines = new_lines[:]
user_stmt = script._parser.user_stmt()
# TODO care for multiline extracts
dct = {}
if user_stmt:
pos = script._pos
line_index = pos[0] - 1
arr, index = helpers.array_for_pos(user_stmt, pos)
if arr is not None:
start_pos = arr[index].start_pos
end_pos = arr[index].end_pos
# take full line if the start line is different from end line
e = end_pos[1] if end_pos[0] == start_pos[0] else None
start_line = new_lines[start_pos[0] - 1]
text = start_line[start_pos[1]:e]
for l in range(start_pos[0], end_pos[0] - 1):
text += '\n' + l
if e is None:
end_line = new_lines[end_pos[0] - 1]
text += '\n' + end_line[:end_pos[1]]
# remove code from new lines
t = text.lstrip()
del_start = start_pos[1] + len(text) - len(t)
text = t.rstrip()
del_end = len(t) - len(text)
if e is None:
new_lines[end_pos[0] - 1] = end_line[end_pos[1] - del_end:]
e = len(start_line)
else:
e = e - del_end
start_line = start_line[:del_start] + new_name + start_line[e:]
new_lines[start_pos[0] - 1] = start_line
new_lines[start_pos[0]:end_pos[0] - 1] = []
# add parentheses in multiline case
open_brackets = ['(', '[', '{']
close_brackets = [')', ']', '}']
if '\n' in text and not (text[0] in open_brackets and text[-1] ==
close_brackets[open_brackets.index(text[0])]):
text = '(%s)' % text
# add new line before statement
indent = user_stmt.start_pos[1]
new = "%s%s = %s" % (' ' * indent, new_name, text)
new_lines.insert(line_index, new)
dct[script.path] = script.path, old_lines, new_lines
return Refactoring(dct)
def inline(script):
"""
:type script: api.Script
"""
new_lines = common.splitlines(common.source_to_unicode(script.source))
dct = {}
definitions = script.goto_assignments()
with common.ignored(AssertionError):
assert len(definitions) == 1
stmt = definitions[0]._definition
usages = script.usages()
inlines = [r for r in usages
if not stmt.start_pos <= (r.line, r.column) <= stmt.end_pos]
inlines = sorted(inlines, key=lambda x: (x.module_path, x.line, x.column),
reverse=True)
expression_list = stmt.expression_list()
# don't allow multiline refactorings for now.
assert stmt.start_pos[0] == stmt.end_pos[0]
index = stmt.start_pos[0] - 1
line = new_lines[index]
replace_str = line[expression_list[0].start_pos[1]:stmt.end_pos[1] + 1]
replace_str = replace_str.strip()
# tuples need parentheses
if expression_list and isinstance(expression_list[0], pr.Array):
arr = expression_list[0]
if replace_str[0] not in ['(', '[', '{'] and len(arr) > 1:
replace_str = '(%s)' % replace_str
# if it's the only assignment, remove the statement
if len(stmt.get_defined_names()) == 1:
line = line[:stmt.start_pos[1]] + line[stmt.end_pos[1]:]
dct = _rename(inlines, replace_str)
# remove the empty line
new_lines = dct[script.path][2]
if line.strip():
new_lines[index] = line
else:
new_lines.pop(index)
return Refactoring(dct)
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