# -*- 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. The fast parser of jedi however requires "wrong" indentation. 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 string import re from collections import namedtuple from io import StringIO from jedi.parser.token import (tok_name, N_TOKENS, ENDMARKER, STRING, NUMBER, opmap, NAME, OP, ERRORTOKEN, NEWLINE, INDENT, DEDENT) from jedi._compatibility import is_py3 cookie_re = re.compile("coding[:=]\s*([-\w.]+)") if is_py3: # 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 COMMENT = N_TOKENS tok_name[COMMENT] = 'COMMENT' def group(*choices): return '(' + '|'.join(choices) + ')' def maybe(*choices): return group(*choices) + '?' # 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+' hex_number = r'0[xX][0-9a-fA-F]+' bin_number = r'0[bB][01]+' if is_py3: oct_number = r'0[oO][0-7]+' else: oct_number = '0[0-7]+' dec_number = r'(?:0+|[1-9][0-9]*)' int_number = group(hex_number, bin_number, oct_number, dec_number) exponent = r'[eE][-+]?[0-9]+' point_float = group(r'[0-9]+\.[0-9]*', r'\.[0-9]+') + maybe(exponent) Expfloat = r'[0-9]+' + exponent float_number = group(point_float, Expfloat) imag_number = group(r'[0-9]+[jJ]', float_number + r'[jJ]') number = group(imag_number, float_number, int_number) # 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("[uUbB]?[rR]?'''", '[uUbB]?[rR]?"""') # Single-line ' or " string. # 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"[+\-*@/%&|^=<>]=?", r"~") bracket = '[][(){}]' special = group(r'\r?\n', r'\.\.\.', r'[:;.,@]') funny = group(operator, bracket, special) # First (or only) line of ' or " string. cont_str = group(r"[bBuU]?[rR]?'[^\n'\\]*(?:\\.[^\n'\\]*)*" + group("'", r'\\\r?\n'), r'[bBuU]?[rR]?"[^\n"\\]*(?:\\.[^\n"\\]*)*' + group('"', r'\\\r?\n')) pseudo_extras = group(r'\\\r?\n', comment, triple) pseudo_token = group(whitespace) + \ group(pseudo_extras, number, funny, cont_str, name) def _compile(expr): return re.compile(expr, re.UNICODE) pseudoprog, single3prog, double3prog = map( _compile, (pseudo_token, single3, double3)) endprogs = {"'": _compile(single), '"': _compile(double), "'''": single3prog, '"""': double3prog, "r'''": single3prog, 'r"""': double3prog, "b'''": single3prog, 'b"""': double3prog, "u'''": single3prog, 'u"""': double3prog, "R'''": single3prog, 'R"""': double3prog, "B'''": single3prog, 'B"""': double3prog, "U'''": single3prog, 'U"""': double3prog, "br'''": single3prog, 'br"""': double3prog, "bR'''": single3prog, 'bR"""': double3prog, "Br'''": single3prog, 'Br"""': double3prog, "BR'''": single3prog, 'BR"""': double3prog, "ur'''": single3prog, 'ur"""': double3prog, "uR'''": single3prog, 'uR"""': double3prog, "Ur'''": single3prog, 'Ur"""': double3prog, "UR'''": single3prog, 'UR"""': double3prog, 'r': None, 'R': None, 'b': None, 'B': None} triple_quoted = {} for t in ("'''", '"""', "r'''", 'r"""', "R'''", 'R"""', "b'''", 'b"""', "B'''", 'B"""', "u'''", 'u"""', "U'''", 'U"""', "br'''", 'br"""', "Br'''", 'Br"""', "bR'''", 'bR"""', "BR'''", 'BR"""', "ur'''", 'ur"""', "Ur'''", 'Ur"""', "uR'''", 'uR"""', "UR'''", 'UR"""'): triple_quoted[t] = t single_quoted = {} for t in ("'", '"', "r'", 'r"', "R'", 'R"', "b'", 'b"', "B'", 'B"', "u'", 'u"', "U'", 'U"', "br'", 'br"', "Br'", 'Br"', "bR'", 'bR"', "BR'", 'BR"', "ur'", 'ur"', "Ur'", 'Ur"', "uR'", 'uR"', "UR'", 'UR"'): single_quoted[t] = t del _compile tabsize = 8 # TODO add with? ALWAYS_BREAK_TOKENS = (';', 'import', 'class', 'def', 'try', 'except', 'finally', 'while', 'return') class TokenInfo(namedtuple('Token', ['type', 'string', 'start_pos', 'prefix'])): def __repr__(self): annotated_type = tok_name[self.type] return ('TokenInfo(type=%s, string=%r, start=%r, prefix=%r)' % self._replace(type=annotated_type)) @property def exact_type(self): if self.type == OP and self.string in opmap: return opmap[self.string] else: return self.type def source_tokens(source, use_exact_op_types=False): """Generate tokens from a the source code (string).""" source = source readline = StringIO(source).readline return generate_tokens(readline, use_exact_op_types) def generate_tokens(readline, use_exact_op_types=False): """ 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] lnum = 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 = '' while True: # loop over lines in stream line = readline() # readline returns empty when finished. See StringIO if not line: if contstr: yield TokenInfo(ERRORTOKEN, contstr, contstr_start, prefix) break lnum += 1 pos, max = 0, len(line) if contstr: # continued string endmatch = endprog.match(line) if endmatch: pos = endmatch.end(0) yield TokenInfo(STRING, contstr + line[:pos], contstr_start, prefix) contstr = '' contline = None else: contstr = contstr + line contline = contline + line continue while pos < max: pseudomatch = pseudoprog.match(line, pos) if not pseudomatch: # scan for tokens txt = line[pos] if line[pos] in '"\'': # If a literal starts but doesn't end the whole rest of the # line is an error token. txt = line[pos:] yield TokenInfo(ERRORTOKEN, txt, (lnum, pos), prefix) pos += 1 continue prefix = additional_prefix + pseudomatch.group(1) additional_prefix = '' start, pos = pseudomatch.span(2) spos = (lnum, start) token, initial = line[start:pos], line[start] if new_line and initial not in '\r\n#': new_line = False if paren_level == 0: i = 0 while line[i] == '\f': i += 1 start -= 1 if start > indents[-1]: yield TokenInfo(INDENT, '', spos, '') indents.append(start) while start < indents[-1]: yield TokenInfo(DEDENT, '', spos, '') indents.pop() if (initial in numchars or # ordinary number (initial == '.' and token != '.' and token != '...')): yield TokenInfo(NUMBER, token, spos, prefix) elif initial in '\r\n': if not new_line and paren_level == 0: yield TokenInfo(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 = endprogs[token] endmatch = endprog.match(line, pos) if endmatch: # all on one line pos = endmatch.end(0) token = line[start:pos] yield TokenInfo(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 = (endprogs.get(initial) or endprogs.get(token[1]) or endprogs.get(token[2])) contstr = line[start:] contline = line break else: # ordinary string yield TokenInfo(STRING, token, spos, prefix) elif is_identifier(initial): # ordinary name if token in ALWAYS_BREAK_TOKENS: paren_level = 0 while True: indent = indents.pop() if indent > start: yield TokenInfo(DEDENT, '', spos, '') else: indents.append(indent) break yield TokenInfo(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 '([{': paren_level += 1 elif token in ')]}': paren_level -= 1 try: # This check is needed in any case to check if it's a valid # operator or just some random unicode character. exact_type = opmap[token] except KeyError: exact_type = typ = ERRORTOKEN if use_exact_op_types: typ = exact_type else: typ = OP yield TokenInfo(typ, token, spos, prefix) if new_line or additional_prefix[-1:] == '\n': end_pos = lnum + 1, 0 else: 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 TokenInfo(DEDENT, '', end_pos, '') yield TokenInfo(ENDMARKER, '', end_pos, additional_prefix)