mirror of
https://github.com/clearml/clearml-agent
synced 2025-02-26 05:59:24 +00:00
276 lines
9.7 KiB
Python
276 lines
9.7 KiB
Python
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# coding: utf-8
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# This module contains abstractions for the input stream. You don't have to
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# looks further, there are no pretty code.
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#
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# We define two classes here.
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#
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# Mark(source, line, column)
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# It's just a record and its only use is producing nice error messages.
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# Parser does not use it for any other purposes.
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#
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# Reader(source, data)
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# Reader determines the encoding of `data` and converts it to unicode.
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# Reader provides the following methods and attributes:
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# reader.peek(length=1) - return the next `length` characters
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# reader.forward(length=1) - move the current position to `length`
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# characters.
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# reader.index - the number of the current character.
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# reader.line, stream.column - the line and the column of the current
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# character.
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import codecs
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from ...._vendor.ruamel.yaml.error import YAMLError, FileMark, StringMark, YAMLStreamError
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from ...._vendor.ruamel.yaml.util import RegExp
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from typing import Any, Dict, Optional, List, Union, Text, Tuple, Optional # NOQA
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# from ruamel.yaml.compat import StreamTextType # NOQA
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__all__ = ['Reader', 'ReaderError']
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class ReaderError(YAMLError):
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def __init__(
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self, name: Any, position: Any, character: Any, encoding: Any, reason: Any,
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) -> None:
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self.name = name
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self.character = character
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self.position = position
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self.encoding = encoding
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self.reason = reason
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def __str__(self) -> Any:
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if isinstance(self.character, bytes):
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return (
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f"'{self.encoding!s}' codec can't decode byte #x{ord(self.character):02x}: "
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f'{self.reason!s}\n'
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f' in "{self.name!s}", position {self.position:d}'
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)
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else:
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return (
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f'unacceptable character #x{self.character:04x}: {self.reason!s}\n'
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f' in "{self.name!s}", position {self.position:d}'
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)
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class Reader:
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# Reader:
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# - determines the data encoding and converts it to a unicode string,
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# - checks if characters are in allowed range,
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# - adds '\0' to the end.
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# Reader accepts
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# - a `bytes` object,
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# - a `str` object,
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# - a file-like object with its `read` method returning `str`,
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# - a file-like object with its `read` method returning `unicode`.
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# Yeah, it's ugly and slow.
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def __init__(self, stream: Any, loader: Any = None) -> None:
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self.loader = loader
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if self.loader is not None and getattr(self.loader, '_reader', None) is None:
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self.loader._reader = self
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self.reset_reader()
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self.stream: Any = stream # as .read is called
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def reset_reader(self) -> None:
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self.name: Any = None
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self.stream_pointer = 0
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self.eof = True
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self.buffer = ""
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self.pointer = 0
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self.raw_buffer: Any = None
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self.raw_decode = None
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self.encoding: Optional[Text] = None
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self.index = 0
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self.line = 0
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self.column = 0
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@property
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def stream(self) -> Any:
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try:
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return self._stream
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except AttributeError:
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raise YAMLStreamError('input stream needs to be specified')
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@stream.setter
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def stream(self, val: Any) -> None:
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if val is None:
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return
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self._stream = None
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if isinstance(val, str):
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self.name = '<unicode string>'
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self.check_printable(val)
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self.buffer = val + '\0'
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elif isinstance(val, bytes):
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self.name = '<byte string>'
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self.raw_buffer = val
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self.determine_encoding()
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else:
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if not hasattr(val, 'read'):
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raise YAMLStreamError('stream argument needs to have a read() method')
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self._stream = val
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self.name = getattr(self.stream, 'name', '<file>')
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self.eof = False
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self.raw_buffer = None
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self.determine_encoding()
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def peek(self, index: int = 0) -> Text:
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try:
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return self.buffer[self.pointer + index]
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except IndexError:
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self.update(index + 1)
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return self.buffer[self.pointer + index]
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def prefix(self, length: int = 1) -> Any:
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if self.pointer + length >= len(self.buffer):
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self.update(length)
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return self.buffer[self.pointer : self.pointer + length]
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def forward_1_1(self, length: int = 1) -> None:
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if self.pointer + length + 1 >= len(self.buffer):
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self.update(length + 1)
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while length != 0:
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ch = self.buffer[self.pointer]
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self.pointer += 1
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self.index += 1
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if ch in '\n\x85\u2028\u2029' or (
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ch == '\r' and self.buffer[self.pointer] != '\n'
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):
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self.line += 1
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self.column = 0
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elif ch != '\uFEFF':
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self.column += 1
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length -= 1
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def forward(self, length: int = 1) -> None:
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if self.pointer + length + 1 >= len(self.buffer):
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self.update(length + 1)
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while length != 0:
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ch = self.buffer[self.pointer]
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self.pointer += 1
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self.index += 1
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if ch == '\n' or (ch == '\r' and self.buffer[self.pointer] != '\n'):
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self.line += 1
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self.column = 0
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elif ch != '\uFEFF':
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self.column += 1
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length -= 1
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def get_mark(self) -> Any:
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if self.stream is None:
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return StringMark(
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self.name, self.index, self.line, self.column, self.buffer, self.pointer,
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)
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else:
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return FileMark(self.name, self.index, self.line, self.column)
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def determine_encoding(self) -> None:
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while not self.eof and (self.raw_buffer is None or len(self.raw_buffer) < 2):
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self.update_raw()
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if isinstance(self.raw_buffer, bytes):
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if self.raw_buffer.startswith(codecs.BOM_UTF16_LE):
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self.raw_decode = codecs.utf_16_le_decode # type: ignore
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self.encoding = 'utf-16-le'
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elif self.raw_buffer.startswith(codecs.BOM_UTF16_BE):
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self.raw_decode = codecs.utf_16_be_decode # type: ignore
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self.encoding = 'utf-16-be'
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else:
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self.raw_decode = codecs.utf_8_decode # type: ignore
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self.encoding = 'utf-8'
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self.update(1)
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NON_PRINTABLE = RegExp(
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'[^\x09\x0A\x0D\x20-\x7E\x85' '\xA0-\uD7FF' '\uE000-\uFFFD' '\U00010000-\U0010FFFF' ']' # NOQA
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)
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_printable_ascii = ('\x09\x0A\x0D' + "".join(map(chr, range(0x20, 0x7F)))).encode('ascii')
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@classmethod
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def _get_non_printable_ascii(cls: Text, data: bytes) -> Optional[Tuple[int, Text]]: # type: ignore # NOQA
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ascii_bytes = data.encode('ascii') # type: ignore
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non_printables = ascii_bytes.translate(None, cls._printable_ascii) # type: ignore
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if not non_printables:
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return None
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non_printable = non_printables[:1]
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return ascii_bytes.index(non_printable), non_printable.decode('ascii')
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@classmethod
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def _get_non_printable_regex(cls, data: Text) -> Optional[Tuple[int, Text]]:
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match = cls.NON_PRINTABLE.search(data)
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if not bool(match):
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return None
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return match.start(), match.group()
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@classmethod
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def _get_non_printable(cls, data: Text) -> Optional[Tuple[int, Text]]:
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try:
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return cls._get_non_printable_ascii(data) # type: ignore
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except UnicodeEncodeError:
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return cls._get_non_printable_regex(data)
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def check_printable(self, data: Any) -> None:
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non_printable_match = self._get_non_printable(data)
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if non_printable_match is not None:
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start, character = non_printable_match
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position = self.index + (len(self.buffer) - self.pointer) + start
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raise ReaderError(
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self.name,
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position,
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ord(character),
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'unicode',
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'special characters are not allowed',
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)
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def update(self, length: int) -> None:
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if self.raw_buffer is None:
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return
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self.buffer = self.buffer[self.pointer :]
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self.pointer = 0
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while len(self.buffer) < length:
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if not self.eof:
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self.update_raw()
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if self.raw_decode is not None:
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try:
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data, converted = self.raw_decode(self.raw_buffer, 'strict', self.eof)
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except UnicodeDecodeError as exc:
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character = self.raw_buffer[exc.start]
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if self.stream is not None:
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position = self.stream_pointer - len(self.raw_buffer) + exc.start
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elif self.stream is not None:
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position = self.stream_pointer - len(self.raw_buffer) + exc.start
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else:
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position = exc.start
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raise ReaderError(self.name, position, character, exc.encoding, exc.reason)
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else:
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data = self.raw_buffer
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converted = len(data)
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self.check_printable(data)
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self.buffer += data
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self.raw_buffer = self.raw_buffer[converted:]
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if self.eof:
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self.buffer += '\0'
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self.raw_buffer = None
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break
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def update_raw(self, size: Optional[int] = None) -> None:
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if size is None:
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size = 4096
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data = self.stream.read(size)
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if self.raw_buffer is None:
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self.raw_buffer = data
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else:
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self.raw_buffer += data
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self.stream_pointer += len(data)
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if not data:
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self.eof = True
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# try:
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# import psyco
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# psyco.bind(Reader)
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# except ImportError:
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# pass
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