pythonVSCode/pythonFiles/rope/base/codeanalyze.py at master · SpenHanley/pythonVSCode · GitHub

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import bisect

import re

import token

import tokenize

class ChangeCollector(object):

def __init__(self, text):

self.text = text

self.changes = []

def add_change(self, start, end, new_text=None):

if new_text is None:

new_text = self.text[start:end]

self.changes.append((start, end, new_text))

def get_changed(self):

if not self.changes:

return None

self.changes.sort(key=lambda x: x[:2])

pieces = []

last_changed = 0

for change in self.changes:

start, end, text = change

pieces.append(self.text[last_changed:start] + text)

last_changed = end

if last_changed < len(self.text):

pieces.append(self.text[last_changed:])

result = ''.join(pieces)

if result != self.text:

return result

class SourceLinesAdapter(object):

"""Adapts source to Lines interface

Note: The creation of this class is expensive.

"""

def __init__(self, source_code):

self.code = source_code

self.starts = None

self._initialize_line_starts()

def _initialize_line_starts(self):

self.starts = []

self.starts.append(0)

try:

i = 0

while True:

i = self.code.index('\n', i) + 1

self.starts.append(i)

except ValueError:

pass

self.starts.append(len(self.code) + 1)

def get_line(self, lineno):

return self.code[self.starts[lineno - 1]:

self.starts[lineno] - 1]

def length(self):

return len(self.starts) - 1

def get_line_number(self, offset):

return bisect.bisect(self.starts, offset)

def get_line_start(self, lineno):

return self.starts[lineno - 1]

def get_line_end(self, lineno):

return self.starts[lineno] - 1

class ArrayLinesAdapter(object):

def __init__(self, lines):

self.lines = lines

def get_line(self, line_number):

return self.lines[line_number - 1]

def length(self):

return len(self.lines)

class LinesToReadline(object):

def __init__(self, lines, start):

self.lines = lines

self.current = start

def readline(self):

if self.current <= self.lines.length():

self.current += 1

return self.lines.get_line(self.current - 1) + '\n'

return ''

def __call__(self):

return self.readline()

class _CustomGenerator(object):

def __init__(self, lines):

self.lines = lines

self.in_string = ''

self.open_count = 0

self.continuation = False

def __call__(self):

size = self.lines.length()

result = []

i = 1

while i <= size:

while i <= size and not self.lines.get_line(i).strip():

i += 1

if i <= size:

start = i

while True:

line = self.lines.get_line(i)

self._analyze_line(line)

if not (self.continuation or self.open_count or

self.in_string) or i == size:

break

i += 1

result.append((start, i))

i += 1

return result

# Matches all backslashes before the token, to detect escaped quotes

_main_tokens = re.compile(r'(\\*)((\'\'\'|"""|\'|")|#|\[|\]|\{|\}|\(|\))')

def _analyze_line(self, line):

token = None

for match in self._main_tokens.finditer(line):

prefix = match.group(1)

token = match.group(2)

# Skip any tokens which are escaped

if len(prefix) % 2 == 1:

continue

if token in ["'''", '"""', "'", '"']:

if not self.in_string:

self.in_string = token

elif self.in_string == token:

self.in_string = ''

if self.in_string:

continue

if token == '#':

break

if token in '([{':

self.open_count += 1

elif token in ')]}':

self.open_count -= 1

if line and token != '#' and line.endswith('\\'):

self.continuation = True

else:

self.continuation = False

def custom_generator(lines):

return _CustomGenerator(lines)()

class LogicalLineFinder(object):

def __init__(self, lines):

self.lines = lines

def logical_line_in(self, line_number):

indents = count_line_indents(self.lines.get_line(line_number))

tries = 0

while True:

block_start = get_block_start(self.lines, line_number, indents)

try:

return self._block_logical_line(block_start, line_number)

except IndentationError as e:

tries += 1

if tries == 5:

raise e

lineno = e.lineno + block_start - 1

indents = count_line_indents(self.lines.get_line(lineno))

def generate_starts(self, start_line=1, end_line=None):

for start, end in self.generate_regions(start_line, end_line):

yield start

def generate_regions(self, start_line=1, end_line=None):

# XXX: `block_start` should be at a better position!

block_start = 1

readline = LinesToReadline(self.lines, block_start)

try:

for start, end in self._logical_lines(readline):

real_start = start + block_start - 1

real_start = self._first_non_blank(real_start)

if end_line is not None and real_start >= end_line:

break

real_end = end + block_start - 1

if real_start >= start_line:

yield (real_start, real_end)

except tokenize.TokenError:

pass

def _block_logical_line(self, block_start, line_number):

readline = LinesToReadline(self.lines, block_start)

shifted = line_number - block_start + 1

region = self._calculate_logical(readline, shifted)

start = self._first_non_blank(region[0] + block_start - 1)

if region[1] is None:

end = self.lines.length()

else:

end = region[1] + block_start - 1

return start, end

def _calculate_logical(self, readline, line_number):

last_end = 1

try:

for start, end in self._logical_lines(readline):

if line_number <= end:

return (start, end)

last_end = end + 1

except tokenize.TokenError as e:

current = e.args[1][0]

return (last_end, max(last_end, current - 1))

return (last_end, None)

def _logical_lines(self, readline):

last_end = 1

for current_token in tokenize.generate_tokens(readline):

current = current_token[2][0]

if current_token[0] == token.NEWLINE:

yield (last_end, current)

last_end = current + 1

def _first_non_blank(self, line_number):

current = line_number

while current < self.lines.length():

line = self.lines.get_line(current).strip()

if line and not line.startswith('#'):

return current

current += 1

return current

def tokenizer_generator(lines):

return LogicalLineFinder(lines).generate_regions()

class CachingLogicalLineFinder(object):

def __init__(self, lines, generate=custom_generator):

self.lines = lines

self._generate = generate

_starts = None

@property

def starts(self):

if self._starts is None:

self._init_logicals()

return self._starts

_ends = None

@property

def ends(self):

if self._ends is None:

self._init_logicals()

return self._ends

def _init_logicals(self):

"""Should initialize _starts and _ends attributes"""

size = self.lines.length() + 1

self._starts = [None] * size

self._ends = [None] * size

for start, end in self._generate(self.lines):

self._starts[start] = True

self._ends[end] = True

def logical_line_in(self, line_number):

start = line_number

while start > 0 and not self.starts[start]:

start -= 1

if start == 0:

try:

start = self.starts.index(True, line_number)

except ValueError:

return (line_number, line_number)

return (start, self.ends.index(True, start))

def generate_starts(self, start_line=1, end_line=None):

if end_line is None:

end_line = self.lines.length()

for index in range(start_line, end_line):

if self.starts[index]:

yield index

def get_block_start(lines, lineno, maximum_indents=80):

"""Approximate block start"""

pattern = get_block_start_patterns()

for i in range(lineno, 0, -1):

match = pattern.search(lines.get_line(i))

if match is not None and \

count_line_indents(lines.get_line(i)) <= maximum_indents:

striped = match.string.lstrip()

# Maybe we're in a list comprehension or generator expression

if i > 1 and striped.startswith('if') or striped.startswith('for'):

bracs = 0

for j in range(i, min(i + 5, lines.length() + 1)):

for c in lines.get_line(j):

if c == '#':

break

if c in '[(':

bracs += 1

if c in ')]':

bracs -= 1

if bracs < 0:

break

if bracs < 0:

break

if bracs < 0:

continue

return i

return 1

_block_start_pattern = None

def get_block_start_patterns():

global _block_start_pattern

if not _block_start_pattern:

'((try|else|finally|except)\\s*:))'

_block_start_pattern = re.compile(pattern, re.M)

return _block_start_pattern

def count_line_indents(line):

indents = 0

for char in line:

if char == ' ':

indents += 1

elif char == '\t':

indents += 8

else:

return indents

return 0

def get_string_pattern():

start = r'(\b[uU]?[rR]?)?'

longstr = r'%s"""(\\.|"(?!"")|\\\n|[^"\\])*"""' % start

shortstr = r'%s"(\\.|\\\n|[^"\\])*"' % start

return '|'.join([longstr, longstr.replace('"', "'"),

shortstr, shortstr.replace('"', "'")])

def get_comment_pattern():

return r'#[^\n]*'

pythonVSCode/pythonFiles/rope/base/codeanalyze.py at master · SpenHanley/pythonVSCode · GitHub

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