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https://github.com/davidhalter/jedi.git
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c4906e0e3f
This also includes a rework for error recovery in the parser. This is now just possible for file_input parsing, which means for full files. Includes also a refactoring of the tokenizer. No more do we have to add an additional newline, because it now works correctly (removes certain confusion.
295 lines
11 KiB
Python
295 lines
11 KiB
Python
# -*- coding: utf-8 -*-
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"""
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This tokenizer has been copied from the ``tokenize.py`` standard library
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tokenizer. The reason was simple: The standard library tokenizer fails
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if the indentation is not right. The fast parser of jedi however requires
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"wrong" indentation.
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Basically this is a stripped down version of the standard library module, so
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you can read the documentation there. Additionally we included some speed and
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memory optimizations here.
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"""
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from __future__ import absolute_import
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import string
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import re
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from io import StringIO
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from jedi.parser.token import (tok_name, N_TOKENS, ENDMARKER, STRING, NUMBER,
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NAME, OP, ERRORTOKEN, NEWLINE, INDENT, DEDENT)
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from jedi._compatibility import is_py3
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cookie_re = re.compile("coding[:=]\s*([-\w.]+)")
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if is_py3:
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# Python 3 has str.isidentifier() to check if a char is a valid identifier
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is_identifier = str.isidentifier
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else:
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namechars = string.ascii_letters + '_'
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is_identifier = lambda s: s in namechars
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COMMENT = N_TOKENS
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tok_name[COMMENT] = 'COMMENT'
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def group(*choices):
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return '(' + '|'.join(choices) + ')'
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def maybe(*choices):
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return group(*choices) + '?'
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# Note: we use unicode matching for names ("\w") but ascii matching for
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# number literals.
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whitespace = r'[ \f\t]*'
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comment = r'#[^\r\n]*'
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name = r'\w+'
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hex_number = r'0[xX][0-9a-fA-F]+'
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bin_number = r'0[bB][01]+'
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oct_number = r'0[oO][0-7]+'
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dec_number = r'(?:0+|[1-9][0-9]*)'
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int_number = group(hex_number, bin_number, oct_number, dec_number)
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exponent = r'[eE][-+]?[0-9]+'
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point_float = group(r'[0-9]+\.[0-9]*', r'\.[0-9]+') + maybe(exponent)
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Expfloat = r'[0-9]+' + exponent
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float_number = group(point_float, Expfloat)
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imag_number = group(r'[0-9]+[jJ]', float_number + r'[jJ]')
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number = group(imag_number, float_number, int_number)
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# Tail end of ' string.
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single = r"[^'\\]*(?:\\.[^'\\]*)*'"
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# Tail end of " string.
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double = r'[^"\\]*(?:\\.[^"\\]*)*"'
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# Tail end of ''' string.
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single3 = r"[^'\\]*(?:(?:\\.|'(?!''))[^'\\]*)*'''"
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# Tail end of """ string.
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double3 = r'[^"\\]*(?:(?:\\.|"(?!""))[^"\\]*)*"""'
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triple = group("[uUbB]?[rR]?'''", '[uUbB]?[rR]?"""')
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# Single-line ' or " string.
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# Because of leftmost-then-longest match semantics, be sure to put the
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# longest operators first (e.g., if = came before ==, == would get
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# recognized as two instances of =).
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operator = group(r"\*\*=?", r">>=?", r"<<=?", r"!=",
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r"//=?", r"->",
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r"[+\-*/%&|^=<>]=?",
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r"~")
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bracket = '[][(){}]'
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special = group(r'\r?\n', r'\.\.\.', r'[:;.,@]')
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funny = group(operator, bracket, special)
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# First (or only) line of ' or " string.
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cont_str = group(r"[bBuU]?[rR]?'[^\n'\\]*(?:\\.[^\n'\\]*)*" +
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group("'", r'\\\r?\n'),
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r'[bBuU]?[rR]?"[^\n"\\]*(?:\\.[^\n"\\]*)*' +
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group('"', r'\\\r?\n'))
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pseudo_extras = group(r'\\\r?\n', comment, triple)
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pseudo_token = group(whitespace) + \
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group(pseudo_extras, number, funny, cont_str, name)
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def _compile(expr):
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return re.compile(expr, re.UNICODE)
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pseudoprog, single3prog, double3prog = map(
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_compile, (pseudo_token, single3, double3))
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endprogs = {"'": _compile(single), '"': _compile(double),
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"'''": single3prog, '"""': double3prog,
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"r'''": single3prog, 'r"""': double3prog,
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"b'''": single3prog, 'b"""': double3prog,
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"u'''": single3prog, 'u"""': double3prog,
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"R'''": single3prog, 'R"""': double3prog,
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"B'''": single3prog, 'B"""': double3prog,
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"U'''": single3prog, 'U"""': double3prog,
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"br'''": single3prog, 'br"""': double3prog,
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"bR'''": single3prog, 'bR"""': double3prog,
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"Br'''": single3prog, 'Br"""': double3prog,
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"BR'''": single3prog, 'BR"""': double3prog,
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"ur'''": single3prog, 'ur"""': double3prog,
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"uR'''": single3prog, 'uR"""': double3prog,
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"Ur'''": single3prog, 'Ur"""': double3prog,
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"UR'''": single3prog, 'UR"""': double3prog,
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'r': None, 'R': None, 'b': None, 'B': None}
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triple_quoted = {}
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for t in ("'''", '"""',
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"r'''", 'r"""', "R'''", 'R"""',
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"b'''", 'b"""', "B'''", 'B"""',
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"u'''", 'u"""', "U'''", 'U"""',
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"br'''", 'br"""', "Br'''", 'Br"""',
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"bR'''", 'bR"""', "BR'''", 'BR"""',
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"ur'''", 'ur"""', "Ur'''", 'Ur"""',
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"uR'''", 'uR"""', "UR'''", 'UR"""'):
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triple_quoted[t] = t
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single_quoted = {}
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for t in ("'", '"',
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"r'", 'r"', "R'", 'R"',
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"b'", 'b"', "B'", 'B"',
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"u'", 'u"', "U'", 'U"',
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"br'", 'br"', "Br'", 'Br"',
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"bR'", 'bR"', "BR'", 'BR"',
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"ur'", 'ur"', "Ur'", 'Ur"',
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"uR'", 'uR"', "UR'", 'UR"'):
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single_quoted[t] = t
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del _compile
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tabsize = 8
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ALWAYS_BREAK_TOKENS = (';', 'import', 'from', 'class', 'def', 'try', 'except',
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'finally', 'while', 'return')
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def source_tokens(source):
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"""Generate tokens from a the source code (string)."""
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source = source
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readline = StringIO(source).readline
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return generate_tokens(readline)
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def generate_tokens(readline):
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"""
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A heavily modified Python standard library tokenizer.
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Additionally to the default information, yields also the prefix of each
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token. This idea comes from lib2to3. The prefix contains all information
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that is irrelevant for the parser like newlines in parentheses or comments.
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"""
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paren_level = 0 # count parentheses
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indents = [0]
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lnum = 0
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max = 0
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numchars = '0123456789'
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contstr = ''
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contline = None
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# We start with a newline. This makes indent at the first position
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# possible. It's not valid Python, but still better than an INDENT in the
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# second line (and not in the first). This makes quite a few things in
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# Jedi's fast parser possible.
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new_line = True
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prefix = '' # Should never be required, but here for safety
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additional_prefix = ''
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while True: # loop over lines in stream
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line = readline() # readline returns empty when finished. See StringIO
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if not line:
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if contstr:
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yield ERRORTOKEN, contstr, contstr_start, prefix
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break
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lnum += 1
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pos, max = 0, len(line)
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if contstr: # continued string
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endmatch = endprog.match(line)
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if endmatch:
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pos = endmatch.end(0)
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yield STRING, contstr + line[:pos], contstr_start, prefix
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contstr = ''
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contline = None
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else:
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contstr = contstr + line
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contline = contline + line
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continue
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while pos < max:
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pseudomatch = pseudoprog.match(line, pos)
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if not pseudomatch: # scan for tokens
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txt = line[pos]
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if line[pos] in '"\'':
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# If a literal starts but doesn't end the whole rest of the
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# line is an error token.
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txt = line[pos:]
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yield ERRORTOKEN, txt, (lnum, pos), prefix
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pos += 1
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continue
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prefix = additional_prefix + pseudomatch.group(1)
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additional_prefix = ''
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start, pos = pseudomatch.span(2)
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spos = (lnum, start)
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token, initial = line[start:pos], line[start]
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if new_line and initial not in '\r\n#':
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new_line = False
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if paren_level == 0:
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if start > indents[-1]:
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yield INDENT, '', spos, ''
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indents.append(start)
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while start < indents[-1]:
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yield DEDENT, '', spos, ''
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indents.pop()
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if (initial in numchars or # ordinary number
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(initial == '.' and token != '.' and token != '...')):
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yield NUMBER, token, spos, prefix
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elif initial in '\r\n':
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if not new_line and paren_level == 0:
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yield NEWLINE, token, spos, prefix
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else:
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additional_prefix = prefix + token
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new_line = True
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elif initial == '#': # Comments
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assert not token.endswith("\n")
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additional_prefix = prefix + token
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elif token in triple_quoted:
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endprog = endprogs[token]
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endmatch = endprog.match(line, pos)
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if endmatch: # all on one line
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pos = endmatch.end(0)
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token = line[start:pos]
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yield STRING, token, spos, prefix
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else:
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contstr_start = (lnum, start) # multiple lines
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contstr = line[start:]
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contline = line
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break
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elif initial in single_quoted or \
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token[:2] in single_quoted or \
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token[:3] in single_quoted:
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if token[-1] == '\n': # continued string
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contstr_start = lnum, start
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endprog = (endprogs.get(initial) or endprogs.get(token[1])
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or endprogs.get(token[2]))
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contstr = line[start:]
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contline = line
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break
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else: # ordinary string
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yield STRING, token, spos, prefix
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elif is_identifier(initial): # ordinary name
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if token in ALWAYS_BREAK_TOKENS:
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paren_level = 0
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while True:
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indent = indents.pop()
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if indent > start:
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yield DEDENT, '', spos, ''
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else:
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indents.append(indent)
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break
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yield NAME, token, spos, prefix
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elif initial == '\\' and line[start:] in ('\\\n', '\\\r\n'): # continued stmt
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additional_prefix += prefix + line[start:]
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break
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else:
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if token in '([{':
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paren_level += 1
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elif token in ')]}':
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paren_level -= 1
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yield OP, token, spos, prefix
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if new_line:
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end_pos = lnum + 1, 0
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else:
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end_pos = lnum, max - 1
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# As the last position we just take the maximally possible position. We
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# remove -1 for the last new line.
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for indent in indents[1:]:
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yield DEDENT, '', end_pos, ''
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yield ENDMARKER, '', end_pos, additional_prefix
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