# Copyright 2004-2005 Elemental Security, Inc. All Rights Reserved. # Licensed to PSF under a Contributor Agreement. # # Modifications: # Copyright David Halter and Contributors # Modifications are dual-licensed: MIT and PSF. # 99% of the code is different from pgen2, now. # # A fork of `parso.python.tokenize`. # https://github.com/davidhalter/parso/blob/master/parso/python/tokenize.py # # The following changes were made: # - Changes to be compatible with PythonTokenTypes # - Removed main section # - Applied type stubs directly # - Removed Python 2 shims # - Added support for Python 3.6 ASYNC/AWAIT hacks # # -*- 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. # pyre-unsafe from __future__ import absolute_import import itertools as _itertools import re import sys from codecs import BOM_UTF8 from collections import namedtuple from dataclasses import dataclass from typing import Dict, Generator, Iterable, Optional, Pattern, Set, Tuple from libcst import CSTLogicError from libcst._parser.parso.python.token import PythonTokenTypes from libcst._parser.parso.utils import PythonVersionInfo, split_lines # Maximum code point of Unicode 6.0: 0x10ffff (1,114,111) MAX_UNICODE = "\U0010ffff" BOM_UTF8_STRING = BOM_UTF8.decode("utf-8") STRING = PythonTokenTypes.STRING NAME = PythonTokenTypes.NAME NUMBER = PythonTokenTypes.NUMBER OP = PythonTokenTypes.OP NEWLINE = PythonTokenTypes.NEWLINE INDENT = PythonTokenTypes.INDENT DEDENT = PythonTokenTypes.DEDENT ASYNC = PythonTokenTypes.ASYNC AWAIT = PythonTokenTypes.AWAIT ENDMARKER = PythonTokenTypes.ENDMARKER ERRORTOKEN = PythonTokenTypes.ERRORTOKEN ERROR_DEDENT = PythonTokenTypes.ERROR_DEDENT FSTRING_START = PythonTokenTypes.FSTRING_START FSTRING_STRING = PythonTokenTypes.FSTRING_STRING FSTRING_END = PythonTokenTypes.FSTRING_END @dataclass(frozen=True) class TokenCollection: pseudo_token: Pattern single_quoted: Set[str] triple_quoted: Set[str] endpats: Dict[str, Pattern] whitespace: Pattern fstring_pattern_map: Dict[str, str] always_break_tokens: Set[str] _token_collection_cache: Dict[PythonVersionInfo, TokenCollection] = {} def group(*choices: str, **kwargs: object) -> str: capture = kwargs.pop("capture", False) # Python 2, arrghhhhh :( assert not kwargs start = "(" if not capture: start += "?:" return start + "|".join(choices) + ")" def maybe(*choices: str) -> str: return group(*choices) + "?" # Return the empty string, plus all of the valid string prefixes. def _all_string_prefixes( version_info: PythonVersionInfo, include_fstring: bool = False, only_fstring: bool = False, ) -> Set[str]: 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"] if version_info >= (3, 0): valid_string_prefixes.append("br") if version_info < (3, 0) or version_info >= (3, 3): valid_string_prefixes.append("u") result = {""} 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: str) -> Pattern: return re.compile(expr, re.UNICODE) def _get_token_collection(version_info: PythonVersionInfo) -> TokenCollection: try: return _token_collection_cache[version_info] except KeyError: _token_collection_cache[version_info] = result = _create_token_collection( version_info ) return result fstring_raw_string = _compile(r"(?:[^{}]+|\{\{|\}\})+") unicode_character_name = r"[A-Za-z0-9\-]+(?: [A-Za-z0-9\-]+)*" fstring_string_single_line = _compile( r"(?:\{\{|\}\}|\\N\{" + unicode_character_name + r"\}|\\(?:\r\n?|\n)|\\[^\r\nN]|[^{}\r\n\\])+" ) fstring_string_multi_line = _compile( r"(?:\{\{|\}\}|\\N\{" + unicode_character_name + r"\}|\\[^N]|[^{}\\])+" ) fstring_format_spec_single_line = _compile(r"(?:\\(?:\r\n?|\n)|[^{}\r\n])+") fstring_format_spec_multi_line = _compile(r"[^{}]+") def _create_token_collection( # noqa: C901 version_info: PythonVersionInfo, ) -> TokenCollection: # Note: we use unicode matching for names ("\w") but ascii matching for # number literals. Whitespace = r"[ \f\t]*" Comment = r"#[^\r\n]*" # Python 2 is pretty much not working properly anymore, we just ignore # parsing unicode properly, which is fine, I guess. if version_info.major == 2: Name = r"([A-Za-z_0-9]+)" elif sys.version_info[0] == 2: # Unfortunately the regex engine cannot deal with the regex below, so # just use this one. Name = r"(\w+)" else: Name = "([A-Za-z_0-9\u0080-" + MAX_UNICODE + "]+)" 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) if version_info.major < 3: Intnumber += "[lL]?" 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"\n", r"[;.,@]"] if version_info >= (3, 0): special_args.insert(0, r"\.\.\.") if version_info >= (3, 8): special_args.insert(0, ":=?") else: special_args.insert(0, ":") Special = group(*special_args) Funny = group(Operator, Bracket, Special) # First (or only) line of ' or " string. ContStr = group( StringPrefix + r"'[^\r\n'\\]*(?:\\.[^\r\n'\\]*)*" + group("'", r"\\(?:\r\n?|\n)"), StringPrefix + r'"[^\r\n"\\]*(?:\\.[^\r\n"\\]*)*' + group('"', r"\\(?:\r\n?|\n)"), ) pseudo_extra_pool = [Comment, Triple] all_quotes = '"', "'", '"""', "'''" if fstring_prefixes: pseudo_extra_pool.append(FStringStart + group(*all_quotes)) PseudoExtras = group(r"\\(?:\r\n?|\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 pseudo_token_compiled = _compile(PseudoToken) return TokenCollection( pseudo_token_compiled, single_quoted, triple_quoted, endpats, _compile(Whitespace), fstring_pattern_map, { ";", "import", "class", "def", "try", "except", "finally", "while", "with", "return", }, ) 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 __repr__(self): return "TokenInfo(type=%s, string=%r, start_pos=%r, prefix=%r)" % self._replace( type=self.type.name ) class FStringNode: def __init__(self, quote, raw): self.quote = quote self.raw = raw 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 if self.parentheses_count == 0: # No parentheses means that the format spec is also finished. self.format_spec_count = 0 def allow_multiline(self): return len(self.quote) == 3 def is_in_expr(self): return self.parentheses_count > self.format_spec_count def is_in_format_spec(self): return not self.is_in_expr() and self.format_spec_count def _close_fstring_if_necessary(fstring_stack, string, start_pos, additional_prefix): for fstring_stack_index, node in enumerate(fstring_stack): if string.startswith(node.quote): token = PythonToken( FSTRING_END, node.quote, start_pos, prefix=additional_prefix ) additional_prefix = "" assert not node.previous_lines del fstring_stack[fstring_stack_index:] return token, "", len(node.quote) return None, additional_prefix, 0 def _find_fstring_string(endpats, fstring_stack, line, lnum, pos): tos = fstring_stack[-1] allow_multiline = tos.allow_multiline() if tos.is_in_format_spec(): if allow_multiline: regex = fstring_format_spec_multi_line else: regex = fstring_format_spec_single_line else: if tos.raw: regex = fstring_raw_string elif allow_multiline: regex = fstring_string_multi_line else: regex = fstring_string_single_line match = regex.match(line, pos) if match is None: return tos.previous_lines, pos if not tos.previous_lines: tos.last_string_start_pos = (lnum, pos) string = match.group(0) for fstring_stack_node in fstring_stack: end_match = endpats[fstring_stack_node.quote].match(string) if end_match is not None: string = end_match.group(0)[: -len(fstring_stack_node.quote)] new_pos = pos new_pos += len(string) # even if allow_multiline is False, we still need to check for trailing # newlines, because a single-line f-string can contain line continuations if string.endswith("\n") or string.endswith("\r"): tos.previous_lines += string string = "" else: string = tos.previous_lines + string return string, new_pos def tokenize( code: str, version_info: PythonVersionInfo, start_pos: Tuple[int, int] = (1, 0) ) -> Generator[PythonToken, None, None]: """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 tokenize_lines( # noqa: C901 lines: Iterable[str], version_info: PythonVersionInfo, start_pos: Tuple[int, int] = (1, 0), ) -> Generator[PythonToken, None, None]: token_collection = _get_token_collection(version_info) if version_info >= PythonVersionInfo(3, 7): return _tokenize_lines_py37_or_above( lines, version_info, token_collection, start_pos=start_pos ) else: return _tokenize_lines_py36_or_below( lines, version_info, token_collection, start_pos=start_pos ) def _tokenize_lines_py36_or_below( # noqa: C901 lines: Iterable[str], version_info: PythonVersionInfo, token_collection: TokenCollection, start_pos: Tuple[int, int] = (1, 0), ) -> Generator[PythonToken, None, None]: """ 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. """ 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 endprog = None # Should not be required, but here for lint contstr_start: Optional[Tuple[int, int]] = None additional_prefix = "" first = True lnum = start_pos[0] - 1 fstring_stack = [] # stash and async_* are used for async/await parsing stashed: Optional[PythonToken] = None async_def: bool = False async_def_indent: int = 0 async_def_newline: bool = False def dedent_if_necessary(start): nonlocal stashed nonlocal async_def nonlocal async_def_indent nonlocal async_def_newline while start < indents[-1]: if start > indents[-2]: yield PythonToken(ERROR_DEDENT, "", (lnum, 0), "") break if stashed is not None: yield stashed stashed = None if async_def and async_def_newline and async_def_indent >= indents[-1]: # We exited an 'async def' block, so stop tracking for indents async_def = False async_def_newline = False async_def_indent = 0 yield PythonToken(DEDENT, "", spos, "") indents.pop() 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 if endprog is None: raise CSTLogicError("Logic error!") endmatch = endprog.match(line) if endmatch: pos = endmatch.end(0) if contstr_start is None: raise CSTLogicError("Logic error!") if stashed is not None: raise CSTLogicError("Logic error!") 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: tos = fstring_stack[-1] if not tos.is_in_expr(): string, pos = _find_fstring_string( token_collection.endpats, fstring_stack, line, lnum, pos ) if string: if stashed is not None: raise CSTLogicError("Logic error!") yield PythonToken( FSTRING_STRING, string, tos.last_string_start_pos, # Never has a prefix because it can start anywhere and # include whitespace. prefix="", ) tos.previous_lines = "" continue if pos == max: break rest = line[pos:] ( fstring_end_token, additional_prefix, quote_length, ) = _close_fstring_if_necessary( fstring_stack, rest, (lnum, pos), additional_prefix ) pos += quote_length if fstring_end_token is not None: if stashed is not None: raise CSTLogicError("Logic error!") yield fstring_end_token continue pseudomatch = token_collection.pseudo_token.match(line, pos) if not pseudomatch: # scan for tokens match = token_collection.whitespace.match(line, pos) if pos == 0: # pyre-fixme[16]: `Optional` has no attribute `end`. yield from dedent_if_necessary(match.end()) pos = match.end() new_line = False yield PythonToken( ERRORTOKEN, line[pos], (lnum, pos), # pyre-fixme[16]: `Optional` has no attribute `group`. additional_prefix + match.group(0), ) additional_prefix = "" pos += 1 continue 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 indent_start = start while line[i] == "\f": i += 1 # TODO don't we need to change spos as well? indent_start -= 1 if indent_start > indents[-1]: if stashed is not None: yield stashed stashed = None yield PythonToken(INDENT, "", spos, "") indents.append(indent_start) yield from dedent_if_necessary(indent_start) if initial in numchars or ( # ordinary number initial == "." and token != "." and token != "..." ): if stashed is not None: yield stashed stashed = None yield PythonToken(NUMBER, token, spos, prefix) elif pseudomatch.group(3) is not None: # ordinary name if token in token_collection.always_break_tokens: fstring_stack[:] = [] paren_level = 0 # We only want to dedent if the token is on a new line. if re.match(r"[ \f\t]*$", line[:start]): while True: indent = indents.pop() if indent > start: if ( async_def and async_def_newline and async_def_indent >= indent ): # We dedented outside of an 'async def' block. async_def = False async_def_newline = False async_def_indent = 0 if stashed is not None: yield stashed stashed = None yield PythonToken(DEDENT, "", spos, "") else: indents.append(indent) break if str.isidentifier(token): should_yield_identifier = True if token in ("async", "await") and async_def: # We're inside an 'async def' block, all async/await are # tokens. if token == "async": yield PythonToken(ASYNC, token, spos, prefix) else: yield PythonToken(AWAIT, token, spos, prefix) should_yield_identifier = False # We are possibly starting an 'async def' section elif token == "async" and not stashed: stashed = PythonToken(NAME, token, spos, prefix) should_yield_identifier = False # We actually are starting an 'async def' section elif ( token == "def" and stashed is not None and stashed[0] is NAME and stashed[1] == "async" ): async_def = True async_def_indent = indents[-1] yield PythonToken(ASYNC, stashed[1], stashed[2], stashed[3]) stashed = None # We are either not stashed, or we output an ASYNC token above. elif stashed: yield stashed stashed = None # If we didn't bail early due to possibly recognizing an 'async def', # then we should yield this token as normal. if should_yield_identifier: yield PythonToken(NAME, token, spos, prefix) else: yield from _split_illegal_unicode_name(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: if async_def: async_def_newline = True if stashed: yield stashed stashed = None 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 token_collection.triple_quoted: endprog = token_collection.endpats[token] endmatch = endprog.match(line, pos) if endmatch: # all on one line pos = endmatch.end(0) token = line[start:pos] if stashed is not None: yield stashed stashed = None yield PythonToken(STRING, token, spos, prefix) else: contstr_start = (lnum, start) # multiple lines contstr = line[start:] contline = line break # Check up to the first 3 chars of the token to see if # they're in the single_quoted set. If so, they start # a string. # We're using the first 3, because we're looking for # "rb'" (for example) at the start of the token. If # we switch to longer prefixes, this needs to be # adjusted. # Note that initial == token[:1]. # Also note that single quote checking must come after # triple quote checking (above). elif ( initial in token_collection.single_quoted or token[:2] in token_collection.single_quoted or token[:3] in token_collection.single_quoted ): if token[-1] in "\r\n": # continued string # This means that a single quoted string ends with a # backslash and is continued. contstr_start = lnum, start endprog = ( token_collection.endpats.get(initial) or token_collection.endpats.get(token[1]) or token_collection.endpats.get(token[2]) ) contstr = line[start:] contline = line break else: # ordinary string if stashed is not None: yield stashed stashed = None yield PythonToken(STRING, token, spos, prefix) elif ( token in token_collection.fstring_pattern_map ): # The start of an fstring. fstring_stack.append( FStringNode( token_collection.fstring_pattern_map[token], "r" in token or "R" in token, ) ) if stashed is not None: yield stashed stashed = None yield PythonToken(FSTRING_START, token, spos, prefix) elif initial == "\\" and line[start:] in ( "\\\n", "\\\r\n", "\\\r", ): # 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: if paren_level: paren_level -= 1 elif ( token == ":" and fstring_stack and fstring_stack[-1].parentheses_count - fstring_stack[-1].format_spec_count == 1 ): fstring_stack[-1].format_spec_count += 1 if stashed is not None: yield stashed stashed = None yield PythonToken(OP, token, spos, prefix) if contstr: yield PythonToken(ERRORTOKEN, contstr, contstr_start, prefix) if contstr.endswith("\n") or contstr.endswith("\r"): new_line = True if stashed is not None: yield stashed stashed = None 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) def _tokenize_lines_py37_or_above( # noqa: C901 lines: Iterable[str], version_info: PythonVersionInfo, token_collection: TokenCollection, start_pos: Tuple[int, int] = (1, 0), ) -> Generator[PythonToken, None, None]: """ 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. """ def dedent_if_necessary(start): while start < indents[-1]: if start > indents[-2]: yield PythonToken(ERROR_DEDENT, "", (lnum, 0), "") break yield PythonToken(DEDENT, "", spos, "") indents.pop() 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 endprog = None # Should not be required, but here for lint contstr_start: Optional[Tuple[int, int]] = None 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 if endprog is None: raise CSTLogicError("Logic error!") endmatch = endprog.match(line) if endmatch: pos = endmatch.end(0) if contstr_start is None: raise CSTLogicError("Logic error!") 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: tos = fstring_stack[-1] if not tos.is_in_expr(): string, pos = _find_fstring_string( token_collection.endpats, fstring_stack, line, lnum, pos ) if string: yield PythonToken( FSTRING_STRING, string, tos.last_string_start_pos, # Never has a prefix because it can start anywhere and # include whitespace. prefix="", ) tos.previous_lines = "" continue if pos == max: break rest = line[pos:] ( fstring_end_token, additional_prefix, quote_length, ) = _close_fstring_if_necessary( fstring_stack, rest, (lnum, pos), additional_prefix ) pos += quote_length if fstring_end_token is not None: yield fstring_end_token continue pseudomatch = token_collection.pseudo_token.match(line, pos) if not pseudomatch: # scan for tokens match = token_collection.whitespace.match(line, pos) if pos == 0: # pyre-fixme[16]: `Optional` has no attribute `end`. for t in dedent_if_necessary(match.end()): yield t pos = match.end() new_line = False yield PythonToken( ERRORTOKEN, line[pos], (lnum, pos), # pyre-fixme[16]: `Optional` has no attribute `group`. additional_prefix + match.group(0), ) additional_prefix = "" pos += 1 continue 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 indent_start = start while line[i] == "\f": i += 1 # TODO don't we need to change spos as well? indent_start -= 1 if indent_start > indents[-1]: yield PythonToken(INDENT, "", spos, "") indents.append(indent_start) for t in dedent_if_necessary(indent_start): yield t if initial in numchars or ( # ordinary number initial == "." and token != "." and token != "..." ): yield PythonToken(NUMBER, token, spos, prefix) elif pseudomatch.group(3) is not None: # ordinary name if token in token_collection.always_break_tokens: fstring_stack[:] = [] paren_level = 0 # We only want to dedent if the token is on a new line. if re.match(r"[ \f\t]*$", line[:start]): while True: indent = indents.pop() if indent > start: yield PythonToken(DEDENT, "", spos, "") else: indents.append(indent) break if str.isidentifier(token): # py37 doesn't need special tokens for async/await, and we could # emit NAME, but then we'd need different grammar for py36 and py37. if token == "async": yield PythonToken(ASYNC, token, spos, prefix) elif token == "await": yield PythonToken(AWAIT, token, spos, prefix) else: yield PythonToken(NAME, token, spos, prefix) else: for t in _split_illegal_unicode_name(token, spos, prefix): yield t # yield from Python 2 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 token_collection.triple_quoted: endprog = token_collection.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 # Check up to the first 3 chars of the token to see if # they're in the single_quoted set. If so, they start # a string. # We're using the first 3, because we're looking for # "rb'" (for example) at the start of the token. If # we switch to longer prefixes, this needs to be # adjusted. # Note that initial == token[:1]. # Also note that single quote checking must come after # triple quote checking (above). elif ( initial in token_collection.single_quoted or token[:2] in token_collection.single_quoted or token[:3] in token_collection.single_quoted ): if token[-1] in "\r\n": # continued string # This means that a single quoted string ends with a # backslash and is continued. contstr_start = lnum, start endprog = ( token_collection.endpats.get(initial) or token_collection.endpats.get(token[1]) or token_collection.endpats.get(token[2]) ) contstr = line[start:] contline = line break else: # ordinary string yield PythonToken(STRING, token, spos, prefix) elif ( token in token_collection.fstring_pattern_map ): # The start of an fstring. fstring_stack.append( FStringNode( token_collection.fstring_pattern_map[token], "r" in token or "R" in token, ) ) yield PythonToken(FSTRING_START, token, spos, prefix) elif initial == "\\" and line[start:] in ( "\\\n", "\\\r\n", "\\\r", ): # 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: if paren_level: paren_level -= 1 elif ( token == ":" and fstring_stack and fstring_stack[-1].parentheses_count - fstring_stack[-1].format_spec_count == 1 ): fstring_stack[-1].format_spec_count += 1 yield PythonToken(OP, token, spos, prefix) if contstr: yield PythonToken(ERRORTOKEN, contstr, contstr_start, prefix) if contstr.endswith("\n") or contstr.endswith("\r"): 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) def _split_illegal_unicode_name( token: str, start_pos: Tuple[int, int], prefix: str ) -> Generator[PythonToken, None, None]: def create_token(): return PythonToken(ERRORTOKEN if is_illegal else NAME, found, pos, prefix) found = "" is_illegal = False pos = start_pos for i, char in enumerate(token): if is_illegal: if str.isidentifier(char): yield create_token() found = char is_illegal = False prefix = "" pos = start_pos[0], start_pos[1] + i else: found += char else: new_found = found + char if str.isidentifier(new_found): found = new_found else: if found: yield create_token() prefix = "" pos = start_pos[0], start_pos[1] + i found = char is_illegal = True if found: yield create_token()