# -*- coding: utf-8 -*-

"""

This tokenizer has been copied from the ``tokenize.py`` standard library

tokenizer. The reason was simple: The standard library tokenizer fails

if the indentation is not right. To make it possible to do error recovery the

tokenizer needed to be rewritten.

Basically this is a stripped down version of the standard library module, so

you can read the documentation there. Additionally we included some speed and

memory optimizations here.

"""

from __future__ import absolute_import

import sys

import string

import re

from collections import namedtuple

import itertools as _itertools

from codecs import BOM_UTF8

from parso.python.token import (tok_name, ENDMARKER, STRING, NUMBER, opmap,

NAME, ERRORTOKEN, NEWLINE, INDENT, DEDENT,

ERROR_DEDENT, FSTRING_STRING, FSTRING_START,

FSTRING_END)

from parso._compatibility import py_version

from parso.utils import split_lines

TokenCollection = namedtuple(

'TokenCollection',

'pseudo_token single_quoted triple_quoted endpats fstring_pattern_map always_break_tokens',

)

BOM_UTF8_STRING = BOM_UTF8.decode('utf-8')

_token_collection_cache = {}

if py_version >= 30:

# Python 3 has str.isidentifier() to check if a char is a valid identifier

is_identifier = str.isidentifier

else:

namechars = string.ascii_letters + '_'

is_identifier = lambda s: s in namechars

def group(*choices, **kwargs):

capture = kwargs.pop('capture', False) # Python 2, arrghhhhh :(

assert not kwargs

start = '('

if not capture:

start += '?:'

return start + '|'.join(choices) + ')'

def maybe(*choices):

return group(*choices) + '?'

# Return the empty string, plus all of the valid string prefixes.

def _all_string_prefixes(version_info, include_fstring=False, only_fstring=False):

def different_case_versions(prefix):

for s in _itertools.product(*[(c, c.upper()) for c in prefix]):

yield ''.join(s)

# The valid string prefixes. Only contain the lower case versions,

# and don't contain any permuations (include 'fr', but not

# 'rf'). The various permutations will be generated.

valid_string_prefixes = ['b', 'r', 'u']

if version_info >= (3, 0):

valid_string_prefixes.append('br')

result = set([''])

if version_info >= (3, 6) and include_fstring:

f = ['f', 'fr']

if only_fstring:

valid_string_prefixes = f

result = set()

else:

valid_string_prefixes += f

elif only_fstring:

return set()

# if we add binary f-strings, add: ['fb', 'fbr']

for prefix in valid_string_prefixes:

for t in _itertools.permutations(prefix):

# create a list with upper and lower versions of each

# character

result.update(different_case_versions(t))

if version_info <= (2, 7):

# In Python 2 the order cannot just be random.

result.update(different_case_versions('ur'))

result.update(different_case_versions('br'))

return result

def _compile(expr):

return re.compile(expr, re.UNICODE)

def _get_token_collection(version_info):

try:

return _token_collection_cache[tuple(version_info)]

except KeyError:

_token_collection_cache[tuple(version_info)] = result = \

_create_token_collection(version_info)

return result

fstring_string_single_line = _compile(r'(?:[^{}\r\n]+|\{\{|\}\})+')

fstring_string_multi_line = _compile(r'(?:[^{}]+|\{\{|\}\})+')

def _create_token_collection(version_info):

# Note: we use unicode matching for names ("\w") but ascii matching for

# number literals.

Whitespace = r'[ \f\t]*'

Comment = r'#[^\r\n]*'

Name = r'\w+'

if version_info >= (3, 6):

Hexnumber = r'0[xX](?:_?[0-9a-fA-F])+'

Binnumber = r'0[bB](?:_?[01])+'

Octnumber = r'0[oO](?:_?[0-7])+'

Decnumber = r'(?:0(?:_?0)*|[1-9](?:_?[0-9])*)'

Intnumber = group(Hexnumber, Binnumber, Octnumber, Decnumber)

Exponent = r'[eE][-+]?[0-9](?:_?[0-9])*'

Pointfloat = group(r'[0-9](?:_?[0-9])*\.(?:[0-9](?:_?[0-9])*)?',

r'\.[0-9](?:_?[0-9])*') + maybe(Exponent)

Expfloat = r'[0-9](?:_?[0-9])*' + Exponent

Floatnumber = group(Pointfloat, Expfloat)

Imagnumber = group(r'[0-9](?:_?[0-9])*[jJ]', Floatnumber + r'[jJ]')

else:

Hexnumber = r'0[xX][0-9a-fA-F]+'

Binnumber = r'0[bB][01]+'

if version_info >= (3, 0):

Octnumber = r'0[oO][0-7]+'

else:

Octnumber = '0[oO]?[0-7]+'

Decnumber = r'(?:0+|[1-9][0-9]*)'

Intnumber = group(Hexnumber, Binnumber, Octnumber, Decnumber)

Exponent = r'[eE][-+]?[0-9]+'

Pointfloat = group(r'[0-9]+\.[0-9]*', r'\.[0-9]+') + maybe(Exponent)

Expfloat = r'[0-9]+' + Exponent

Floatnumber = group(Pointfloat, Expfloat)

Imagnumber = group(r'[0-9]+[jJ]', Floatnumber + r'[jJ]')

Number = group(Imagnumber, Floatnumber, Intnumber)

# Note that since _all_string_prefixes includes the empty string,

# StringPrefix can be the empty string (making it optional).

possible_prefixes = _all_string_prefixes(version_info)

StringPrefix = group(*possible_prefixes)

StringPrefixWithF = group(*_all_string_prefixes(version_info, include_fstring=True))

fstring_prefixes = _all_string_prefixes(version_info, include_fstring=True, only_fstring=True)

FStringStart = group(*fstring_prefixes)

# Tail end of ' string.

Single = r"[^'\\]*(?:\\.[^'\\]*)*'"

# Tail end of " string.

Double = r'[^"\\]*(?:\\.[^"\\]*)*"'

# Tail end of ''' string.

Single3 = r"[^'\\]*(?:(?:\\.|'(?!''))[^'\\]*)*'''"

# Tail end of """ string.

Double3 = r'[^"\\]*(?:(?:\\.|"(?!""))[^"\\]*)*"""'

Triple = group(StringPrefixWithF + "'''", StringPrefixWithF + '"""')

# Because of leftmost-then-longest match semantics, be sure to put the

# longest operators first (e.g., if = came before ==, == would get

# recognized as two instances of =).

Operator = group(r"\*\*=?", r">>=?", r"<<=?",

r"//=?", r"->",

r"[+\-*/%&@`|^!=<>]=?",

r"~")

Bracket = '[][(){}]'

special_args = [r'\r?\n', r'[:;.,@]']

if version_info >= (3, 0):

special_args.insert(0, r'\.\.\.')

Special = group(*special_args)

Funny = group(Operator, Bracket, Special)

# First (or only) line of ' or " string.

ContStr = group(StringPrefix + r"'[^\n'\\]*(?:\\.[^\n'\\]*)*" +

group("'", r'\\\r?\n'),

StringPrefix + r'"[^\n"\\]*(?:\\.[^\n"\\]*)*' +

group('"', r'\\\r?\n'))

pseudo_extra_pool = [Comment, Triple]

all_quotes = '"', "'", '"""', "'''"

if fstring_prefixes:

pseudo_extra_pool.append(FStringStart + group(*all_quotes))

PseudoExtras = group(r'\\\r?\n|\Z', *pseudo_extra_pool)

PseudoToken = group(Whitespace, capture=True) + \

group(PseudoExtras, Number, Funny, ContStr, Name, capture=True)

# For a given string prefix plus quotes, endpats maps it to a regex

# to match the remainder of that string. _prefix can be empty, for

# a normal single or triple quoted string (with no prefix).

endpats = {}

for _prefix in possible_prefixes:

endpats[_prefix + "'"] = _compile(Single)

endpats[_prefix + '"'] = _compile(Double)

endpats[_prefix + "'''"] = _compile(Single3)

endpats[_prefix + '"""'] = _compile(Double3)

# A set of all of the single and triple quoted string prefixes,

# including the opening quotes.

single_quoted = set()

triple_quoted = set()

fstring_pattern_map = {}

for t in possible_prefixes:

for quote in '"', "'":

single_quoted.add(t + quote)

for quote in '"""', "'''":

triple_quoted.add(t + quote)

for t in fstring_prefixes:

for quote in all_quotes:

fstring_pattern_map[t + quote] = quote

ALWAYS_BREAK_TOKENS = (';', 'import', 'class', 'def', 'try', 'except',

'finally', 'while', 'with', 'return')

pseudo_token_compiled = _compile(PseudoToken)

return TokenCollection(

pseudo_token_compiled, single_quoted, triple_quoted, endpats,

fstring_pattern_map, ALWAYS_BREAK_TOKENS

)

class Token(namedtuple('Token', ['type', 'string', 'start_pos', 'prefix'])):

@property

def end_pos(self):

lines = split_lines(self.string)

if len(lines) > 1:

return self.start_pos[0] + len(lines) - 1, 0

else:

return self.start_pos[0], self.start_pos[1] + len(self.string)

class PythonToken(Token):

def _get_type_name(self, exact=True):

return tok_name[self.type]

def __repr__(self):

return ('TokenInfo(type=%s, string=%r, start=%r, prefix=%r)' %

self._replace(type=self._get_type_name()))

class FStringNode(object):

def __init__(self, quote):

self.quote = quote

self.parentheses_count = 0

self.previous_lines = ''

self.last_string_start_pos = None

# In the syntax there can be multiple format_spec's nested:

# {x:{y:3}}

self.format_spec_count = 0

def open_parentheses(self, character):

self.parentheses_count += 1

def close_parentheses(self, character):

self.parentheses_count -= 1

def allow_multiline(self):

return len(self.quote) == 3

def is_in_expr(self):

return (self.parentheses_count - self.format_spec_count) > 0

def _check_fstring_ending(fstring_stack, token, from_start=False):

fstring_end = float('inf')

fstring_index = None

for i, node in enumerate(fstring_stack):

if from_start:

if token.startswith(node.quote):

fstring_index = i

fstring_end = len(node.quote)

else:

continue

else:

try:

end = token.index(node.quote)

except ValueError:

pass

else:

if fstring_index is None or end < fstring_end:

fstring_index = i

fstring_end = end

return fstring_index, fstring_end

def _find_fstring_string(fstring_stack, line, lnum, pos):

tos = fstring_stack[-1]

if tos.is_in_expr():

return '', pos

else:

new_pos = pos

allow_multiline = tos.allow_multiline()

if allow_multiline:

match = fstring_string_multi_line.match(line, pos)

else:

match = fstring_string_single_line.match(line, pos)

if match is None:

string = tos.previous_lines

else:

if not tos.previous_lines:

tos.last_string_start_pos = (lnum, pos)

string = match.group(0)

for fstring_stack_node in fstring_stack:

try:

string = string[:string.index(fstring_stack_node.quote)]

except ValueError:

pass # The string was not found.

new_pos += len(string)

if allow_multiline and string.endswith('\n'):

tos.previous_lines += string

string = ''

else:

string = tos.previous_lines + string

return string, new_pos

def tokenize(code, version_info, start_pos=(1, 0)):

"""Generate tokens from a the source code (string)."""

lines = split_lines(code, keepends=True)

return tokenize_lines(lines, version_info, start_pos=start_pos)

def _print_tokens(func):

"""

A small helper function to help debug the tokenize_lines function.

"""

def wrapper(*args, **kwargs):

for token in func(*args, **kwargs):

print(token)

yield token

return wrapper

# @_print_tokens

def tokenize_lines(lines, version_info, start_pos=(1, 0)):

"""

A heavily modified Python standard library tokenizer.

Additionally to the default information, yields also the prefix of each

token. This idea comes from lib2to3. The prefix contains all information

that is irrelevant for the parser like newlines in parentheses or comments.

"""

pseudo_token, single_quoted, triple_quoted, endpats, fstring_pattern_map, always_break_tokens, = \

_get_token_collection(version_info)

paren_level = 0 # count parentheses

indents = [0]

max = 0

numchars = '0123456789'

contstr = ''

contline = None

# We start with a newline. This makes indent at the first position

# possible. It's not valid Python, but still better than an INDENT in the

# second line (and not in the first). This makes quite a few things in

# Jedi's fast parser possible.

new_line = True

prefix = '' # Should never be required, but here for safety

additional_prefix = ''

first = True

lnum = start_pos[0] - 1

fstring_stack = []

for line in lines: # loop over lines in stream

lnum += 1

pos = 0

max = len(line)

if first:

if line.startswith(BOM_UTF8_STRING):

additional_prefix = BOM_UTF8_STRING

line = line[1:]

max = len(line)

# Fake that the part before was already parsed.

line = '^' * start_pos[1] + line

pos = start_pos[1]

max += start_pos[1]

first = False

if contstr: # continued string

endmatch = endprog.match(line)

if endmatch:

pos = endmatch.end(0)

yield PythonToken(STRING, contstr + line[:pos], contstr_start, prefix)

contstr = ''

contline = None

else:

contstr = contstr + line

contline = contline + line

continue

while pos < max:

if fstring_stack:

string, pos = _find_fstring_string(fstring_stack, line, lnum, pos)

if string:

yield PythonToken(

FSTRING_STRING, string,

fstring_stack[-1].last_string_start_pos,

# Never has a prefix because it can start anywhere and

# include whitespace.

prefix=''

)

fstring_stack[-1].previous_lines = ''

continue

if pos == max:

break

rest = line[pos:]

fstring_index, end = _check_fstring_ending(fstring_stack, rest, from_start=True)

if fstring_index is not None:

yield PythonToken(

FSTRING_END,

fstring_stack[fstring_index].quote,

(lnum, pos),

prefix=additional_prefix,

)

additional_prefix = ''

del fstring_stack[fstring_index:]

pos += end

continue

pseudomatch = pseudo_token.match(line, pos)

if not pseudomatch: # scan for tokens

txt = line[pos:]

if txt.endswith('\n'):

new_line = True

yield PythonToken(ERRORTOKEN, txt, (lnum, pos), additional_prefix)

additional_prefix = ''

break

prefix = additional_prefix + pseudomatch.group(1)

additional_prefix = ''

start, pos = pseudomatch.span(2)

spos = (lnum, start)

token = pseudomatch.group(2)

if token == '':

assert prefix

additional_prefix = prefix

# This means that we have a line with whitespace/comments at

# the end, which just results in an endmarker.

break

initial = token[0]

if new_line and initial not in '\r\n#':

new_line = False

if paren_level == 0 and not fstring_stack:

i = 0

while line[i] == '\f':

i += 1

# TODO don't we need to change spos as well?

start -= 1

if start > indents[-1]:

yield PythonToken(INDENT, '', spos, '')

indents.append(start)

while start < indents[-1]:

if start > indents[-2]:

yield PythonToken(ERROR_DEDENT, '', (lnum, 0), '')

break

yield PythonToken(DEDENT, '', spos, '')

indents.pop()

if fstring_stack:

fstring_index, end = _check_fstring_ending(fstring_stack, token)

if fstring_index is not None:

if end != 0:

yield PythonToken(ERRORTOKEN, token[:end], spos, prefix)

prefix = ''

yield PythonToken(

FSTRING_END,

fstring_stack[fstring_index].quote,

(lnum, spos[1] + 1),

prefix=prefix

)

del fstring_stack[fstring_index:]

pos -= len(token) - end

continue

if (initial in numchars or # ordinary number

(initial == '.' and token != '.' and token != '...')):

yield PythonToken(NUMBER, token, spos, prefix)

elif initial in '\r\n':

if any(not f.allow_multiline() for f in fstring_stack):

# Would use fstring_stack.clear, but that's not available

# in Python 2.

fstring_stack[:] = []

if not new_line and paren_level == 0 and not fstring_stack:

yield PythonToken(NEWLINE, token, spos, prefix)

else:

additional_prefix = prefix + token

new_line = True

elif initial == '#': # Comments

assert not token.endswith("\n")

additional_prefix = prefix + token

elif token in triple_quoted:

endprog = endpats[token]

endmatch = endprog.match(line, pos)

if endmatch: # all on one line

pos = endmatch.end(0)

token = line[start:pos]

yield PythonToken(STRING, token, spos, prefix)

else:

contstr_start = (lnum, start) # multiple lines

contstr = line[start:]

contline = line

break

elif initial in single_quoted or \

token[:2] in single_quoted or \

token[:3] in single_quoted:

if token[-1] == '\n': # continued string

contstr_start = lnum, start

endprog = (endpats.get(initial) or endpats.get(token[1])

or endpats.get(token[2]))

contstr = line[start:]

contline = line

break

else: # ordinary string

yield PythonToken(STRING, token, spos, prefix)

elif token in fstring_pattern_map: # The start of an fstring.

fstring_stack.append(FStringNode(fstring_pattern_map[token]))

yield PythonToken(FSTRING_START, token, spos, prefix)

elif is_identifier(initial): # ordinary name

if token in always_break_tokens:

fstring_stack[:] = []

paren_level = 0

while True:

indent = indents.pop()

if indent > start:

yield PythonToken(DEDENT, '', spos, '')

else:

indents.append(indent)

break

yield PythonToken(NAME, token, spos, prefix)

elif initial == '\\' and line[start:] in ('\\\n', '\\\r\n'): # continued stmt

additional_prefix += prefix + line[start:]

break

else:

if token in '([{':

if fstring_stack:

fstring_stack[-1].open_parentheses(token)

else:

paren_level += 1

elif token in ')]}':

if fstring_stack:

fstring_stack[-1].close_parentheses(token)

else:

paren_level -= 1

elif token == ':' and fstring_stack \

and fstring_stack[-1].parentheses_count == 1:

fstring_stack[-1].format_spec_count += 1

try:

# This check is needed in any case to check if it's a valid

# operator or just some random unicode character.

typ = opmap[token]

except KeyError:

typ = ERRORTOKEN

yield PythonToken(typ, token, spos, prefix)

if contstr:

yield PythonToken(ERRORTOKEN, contstr, contstr_start, prefix)

if contstr.endswith('\n'):

new_line = True

end_pos = lnum, max

# As the last position we just take the maximally possible position. We

# remove -1 for the last new line.

for indent in indents[1:]:

yield PythonToken(DEDENT, '', end_pos, '')

yield PythonToken(ENDMARKER, '', end_pos, additional_prefix)

if __name__ == "__main__":

if len(sys.argv) >= 2:

path = sys.argv[1]

with open(path) as f:

code = f.read()

else:

code = sys.stdin.read()

from parso.utils import python_bytes_to_unicode, parse_version_string

if isinstance(code, bytes):

code = python_bytes_to_unicode(code)

for token in tokenize(code, parse_version_string()):

print(token)