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|
# coding: utf-8
from __future__ import absolute_import
# This module contains abstractions for the input stream. You don't have to
# looks further, there are no pretty code.
#
# We define two classes here.
#
# Mark(source, line, column)
# It's just a record and its only use is producing nice error messages.
# Parser does not use it for any other purposes.
#
# Reader(source, data)
# Reader determines the encoding of `data` and converts it to unicode.
# Reader provides the following methods and attributes:
# reader.peek(length=1) - return the next `length` characters
# reader.forward(length=1) - move the current position to `length`
# characters.
# reader.index - the number of the current character.
# reader.line, stream.column - the line and the column of the current
# character.
import codecs
from ruamel.yaml.error import YAMLError, FileMark, StringMark, YAMLStreamError
from ruamel.yaml.compat import text_type, binary_type, PY3, UNICODE_SIZE
from ruamel.yaml.util import RegExp
if False: # MYPY
from typing import Any, Dict, Optional, List, Union, Text, Tuple, Optional # NOQA
# from ruamel.yaml.compat import StreamTextType # NOQA
__all__ = ['Reader', 'ReaderError']
class ReaderError(YAMLError):
def __init__(self, name, position, character, encoding, reason):
# type: (Any, Any, Any, Any, Any) -> None
self.name = name
self.character = character
self.position = position
self.encoding = encoding
self.reason = reason
def __str__(self):
# type: () -> str
if isinstance(self.character, binary_type):
return "'%s' codec can't decode byte #x%02x: %s\n" ' in "%s", position %d' % (
self.encoding,
ord(self.character),
self.reason,
self.name,
self.position,
)
else:
return 'unacceptable character #x%04x: %s\n' ' in "%s", position %d' % (
self.character,
self.reason,
self.name,
self.position,
)
class Reader(object):
# Reader:
# - determines the data encoding and converts it to a unicode string,
# - checks if characters are in allowed range,
# - adds '\0' to the end.
# Reader accepts
# - a `str` object (PY2) / a `bytes` object (PY3),
# - a `unicode` object (PY2) / a `str` object (PY3),
# - a file-like object with its `read` method returning `str`,
# - a file-like object with its `read` method returning `unicode`.
# Yeah, it's ugly and slow.
def __init__(self, stream, loader=None):
# type: (Any, Any) -> None
self.loader = loader
if self.loader is not None and getattr(self.loader, '_reader', None) is None:
self.loader._reader = self
self.reset_reader()
self.stream = stream # type: Any # as .read is called
def reset_reader(self):
# type: () -> None
self.name = None # type: Any
self.stream_pointer = 0
self.eof = True
self.buffer = ""
self.pointer = 0
self.raw_buffer = None # type: Any
self.raw_decode = None
self.encoding = None # type: Optional[Text]
self.index = 0
self.line = 0
self.column = 0
@property
def stream(self):
# type: () -> Any
try:
return self._stream
except AttributeError:
raise YAMLStreamError('input stream needs to specified')
@stream.setter
def stream(self, val):
# type: (Any) -> None
if val is None:
return
self._stream = None
if isinstance(val, text_type):
self.name = '<unicode string>'
self.check_printable(val)
self.buffer = val + u'\0' # type: ignore
elif isinstance(val, binary_type):
self.name = '<byte string>'
self.raw_buffer = val
self.determine_encoding()
else:
if not hasattr(val, 'read'):
raise YAMLStreamError('stream argument needs to have a read() method')
self._stream = val
self.name = getattr(self.stream, 'name', '<file>')
self.eof = False
self.raw_buffer = None
self.determine_encoding()
def peek(self, index=0):
# type: (int) -> Text
try:
return self.buffer[self.pointer + index]
except IndexError:
self.update(index + 1)
return self.buffer[self.pointer + index]
def prefix(self, length=1):
# type: (int) -> Any
if self.pointer + length >= len(self.buffer):
self.update(length)
return self.buffer[self.pointer : self.pointer + length]
def forward_1_1(self, length=1):
# type: (int) -> None
if self.pointer + length + 1 >= len(self.buffer):
self.update(length + 1)
while length != 0:
ch = self.buffer[self.pointer]
self.pointer += 1
self.index += 1
if ch in u'\n\x85\u2028\u2029' or (
ch == u'\r' and self.buffer[self.pointer] != u'\n'
):
self.line += 1
self.column = 0
elif ch != u'\uFEFF':
self.column += 1
length -= 1
def forward(self, length=1):
# type: (int) -> None
if self.pointer + length + 1 >= len(self.buffer):
self.update(length + 1)
while length != 0:
ch = self.buffer[self.pointer]
self.pointer += 1
self.index += 1
if ch == u'\n' or (ch == u'\r' and self.buffer[self.pointer] != u'\n'):
self.line += 1
self.column = 0
elif ch != u'\uFEFF':
self.column += 1
length -= 1
def get_mark(self):
# type: () -> Any
if self.stream is None:
return StringMark(
self.name, self.index, self.line, self.column, self.buffer, self.pointer
)
else:
return FileMark(self.name, self.index, self.line, self.column)
def determine_encoding(self):
# type: () -> None
while not self.eof and (self.raw_buffer is None or len(self.raw_buffer) < 2):
self.update_raw()
if isinstance(self.raw_buffer, binary_type):
if self.raw_buffer.startswith(codecs.BOM_UTF16_LE):
self.raw_decode = codecs.utf_16_le_decode # type: ignore
self.encoding = 'utf-16-le'
elif self.raw_buffer.startswith(codecs.BOM_UTF16_BE):
self.raw_decode = codecs.utf_16_be_decode # type: ignore
self.encoding = 'utf-16-be'
else:
self.raw_decode = codecs.utf_8_decode # type: ignore
self.encoding = 'utf-8'
self.update(1)
if UNICODE_SIZE == 2:
NON_PRINTABLE = RegExp(
u'[^\x09\x0A\x0D\x20-\x7E\x85' u'\xA0-\uD7FF' u'\uE000-\uFFFD' u']'
)
else:
NON_PRINTABLE = RegExp(
u'[^\x09\x0A\x0D\x20-\x7E\x85'
u'\xA0-\uD7FF'
u'\uE000-\uFFFD'
u'\U00010000-\U0010FFFF'
u']'
)
_printable_ascii = ('\x09\x0A\x0D' + "".join(map(chr, range(0x20, 0x7F)))).encode('ascii')
@classmethod
def _get_non_printable_ascii(cls, data): # type: ignore
# type: (Text, bytes) -> Optional[Tuple[int, Text]]
ascii_bytes = data.encode('ascii')
non_printables = ascii_bytes.translate(None, cls._printable_ascii) # type: ignore
if not non_printables:
return None
non_printable = non_printables[:1]
return ascii_bytes.index(non_printable), non_printable.decode('ascii')
@classmethod
def _get_non_printable_regex(cls, data):
# type: (Text) -> Optional[Tuple[int, Text]]
match = cls.NON_PRINTABLE.search(data)
if not bool(match):
return None
return match.start(), match.group()
@classmethod
def _get_non_printable(cls, data):
# type: (Text) -> Optional[Tuple[int, Text]]
try:
return cls._get_non_printable_ascii(data) # type: ignore
except UnicodeEncodeError:
return cls._get_non_printable_regex(data)
def check_printable(self, data):
# type: (Any) -> None
non_printable_match = self._get_non_printable(data)
if non_printable_match is not None:
start, character = non_printable_match
position = self.index + (len(self.buffer) - self.pointer) + start
raise ReaderError(
self.name,
position,
ord(character),
'unicode',
'special characters are not allowed',
)
def update(self, length):
# type: (int) -> None
if self.raw_buffer is None:
return
self.buffer = self.buffer[self.pointer :]
self.pointer = 0
while len(self.buffer) < length:
if not self.eof:
self.update_raw()
if self.raw_decode is not None:
try:
data, converted = self.raw_decode(self.raw_buffer, 'strict', self.eof)
except UnicodeDecodeError as exc:
if PY3:
character = self.raw_buffer[exc.start]
else:
character = exc.object[exc.start]
if self.stream is not None:
position = self.stream_pointer - len(self.raw_buffer) + exc.start
elif self.stream is not None:
position = self.stream_pointer - len(self.raw_buffer) + exc.start
else:
position = exc.start
raise ReaderError(self.name, position, character, exc.encoding, exc.reason)
else:
data = self.raw_buffer
converted = len(data)
self.check_printable(data)
self.buffer += data
self.raw_buffer = self.raw_buffer[converted:]
if self.eof:
self.buffer += '\0'
self.raw_buffer = None
break
def update_raw(self, size=None):
# type: (Optional[int]) -> None
if size is None:
size = 4096 if PY3 else 1024
data = self.stream.read(size)
if self.raw_buffer is None:
self.raw_buffer = data
else:
self.raw_buffer += data
self.stream_pointer += len(data)
if not data:
self.eof = True
# try:
# import psyco
# psyco.bind(Reader)
# except ImportError:
# pass
|
