1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
|
# coding: utf-8
# 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.util import RegExp
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: Any, position: Any, character: Any, encoding: Any, reason: Any,
) -> None:
self.name = name
self.character = character
self.position = position
self.encoding = encoding
self.reason = reason
def __str__(self) -> Any:
if isinstance(self.character, bytes):
return (
f"'{self.encoding!s}' codec can't decode byte #x{ord(self.character):02x}: "
f'{self.reason!s}\n'
f' in "{self.name!s}", position {self.position:d}'
)
else:
return (
f'unacceptable character #x{self.character:04x}: {self.reason!s}\n'
f' in "{self.name!s}", position {self.position:d}'
)
class Reader:
# 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 `bytes` object,
# - a `str` object,
# - 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: Any, loader: Any = None) -> 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: Any = stream # as .read is called
def reset_reader(self) -> None:
self.name: Any = None
self.stream_pointer = 0
self.eof = True
self.buffer = ""
self.pointer = 0
self.raw_buffer: Any = None
self.raw_decode = None
self.encoding: Optional[Text] = None
self.index = 0
self.line = 0
self.column = 0
@property
def stream(self) -> Any:
try:
return self._stream
except AttributeError:
raise YAMLStreamError('input stream needs to be specified')
@stream.setter
def stream(self, val: Any) -> None:
if val is None:
return
self._stream = None
if isinstance(val, str):
self.name = '<unicode string>'
self.check_printable(val)
self.buffer = val + '\0'
elif isinstance(val, bytes):
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: int = 0) -> Text:
try:
return self.buffer[self.pointer + index]
except IndexError:
self.update(index + 1)
return self.buffer[self.pointer + index]
def prefix(self, length: int = 1) -> 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: int = 1) -> 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 '\n\x85\u2028\u2029' or (
ch == '\r' and self.buffer[self.pointer] != '\n'
):
self.line += 1
self.column = 0
elif ch != '\uFEFF':
self.column += 1
length -= 1
def forward(self, length: int = 1) -> 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 == '\n' or (ch == '\r' and self.buffer[self.pointer] != '\n'):
self.line += 1
self.column = 0
elif ch != '\uFEFF':
self.column += 1
length -= 1
def get_mark(self) -> 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) -> 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, bytes):
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)
NON_PRINTABLE = RegExp(
'[^\x09\x0A\x0D\x20-\x7E\x85' '\xA0-\uD7FF' '\uE000-\uFFFD' '\U00010000-\U0010FFFF' ']' # NOQA
)
_printable_ascii = ('\x09\x0A\x0D' + "".join(map(chr, range(0x20, 0x7F)))).encode('ascii')
@classmethod
def _get_non_printable_ascii(cls: Text, data: bytes) -> Optional[Tuple[int, Text]]: # type: ignore # NOQA
ascii_bytes = data.encode('ascii') # type: ignore
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: 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: 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: 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: 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:
character = self.raw_buffer[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: Optional[int] = None) -> None:
if size is None:
size = 4096
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
|
