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html5lib-python/html5lib/_inputstream.py at master · astanley18074/html5lib-python · GitHub
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from
__future__
import
absolute_import
,
division
,
unicode_literals
from
six
import
text_type
,
binary_type
from
six
.
moves
import
http_client
,
urllib
import
codecs
import
re
import
webencodings
from
.
constants
import
EOF
,
spaceCharacters
,
asciiLetters
,
asciiUppercase
from
.
constants
import
ReparseException
from
.
import
_utils
from
io
import
StringIO
try
:
from
io
import
BytesIO
except
ImportError
:
BytesIO
=
StringIO
# Non-unicode versions of constants for use in the pre-parser
spaceCharactersBytes
=
frozenset
([
item
.
encode
(
"ascii"
)
for
item
in
spaceCharacters
])
asciiLettersBytes
=
frozenset
([
item
.
encode
(
"ascii"
)
for
item
in
asciiLetters
])
asciiUppercaseBytes
=
frozenset
([
item
.
encode
(
"ascii"
)
for
item
in
asciiUppercase
])
spacesAngleBrackets
=
spaceCharactersBytes
|
frozenset
([
b">"
,
b"<"
])
invalid_unicode_no_surrogate
=
"[
\u0001
-
\u0008
\u000B
\u000E
-
\u001F
\u007F
-
\u009F
\uFDD0
-
\uFDEF
\uFFFE
\uFFFF
\U0001FFFE
\U0001FFFF
\U0002FFFE
\U0002FFFF
\U0003FFFE
\U0003FFFF
\U0004FFFE
\U0004FFFF
\U0005FFFE
\U0005FFFF
\U0006FFFE
\U0006FFFF
\U0007FFFE
\U0007FFFF
\U0008FFFE
\U0008FFFF
\U0009FFFE
\U0009FFFF
\U000AFFFE
\U000AFFFF
\U000BFFFE
\U000BFFFF
\U000CFFFE
\U000CFFFF
\U000DFFFE
\U000DFFFF
\U000EFFFE
\U000EFFFF
\U000FFFFE
\U000FFFFF
\U0010FFFE
\U0010FFFF
]"
# noqa
if
_utils
.
supports_lone_surrogates
:
# Use one extra step of indirection and create surrogates with
# eval. Not using this indirection would introduce an illegal
# unicode literal on platforms not supporting such lone
# surrogates.
assert
invalid_unicode_no_surrogate
[
-
1
]
==
"]"
and
invalid_unicode_no_surrogate
.
count
(
"]"
)
==
1
invalid_unicode_re
=
re
.
compile
(
invalid_unicode_no_surrogate
[:
-
1
]
+
eval
(
'"
\\
uD800-
\\
uDFFF"'
)
+
# pylint:disable=eval-used
"]"
)
else
:
invalid_unicode_re
=
re
.
compile
(
invalid_unicode_no_surrogate
)
non_bmp_invalid_codepoints
=
set
([
0x1FFFE
,
0x1FFFF
,
0x2FFFE
,
0x2FFFF
,
0x3FFFE
,
0x3FFFF
,
0x4FFFE
,
0x4FFFF
,
0x5FFFE
,
0x5FFFF
,
0x6FFFE
,
0x6FFFF
,
0x7FFFE
,
0x7FFFF
,
0x8FFFE
,
0x8FFFF
,
0x9FFFE
,
0x9FFFF
,
0xAFFFE
,
0xAFFFF
,
0xBFFFE
,
0xBFFFF
,
0xCFFFE
,
0xCFFFF
,
0xDFFFE
,
0xDFFFF
,
0xEFFFE
,
0xEFFFF
,
0xFFFFE
,
0xFFFFF
,
0x10FFFE
,
0x10FFFF
])
ascii_punctuation_re
=
re
.
compile
(
"[
\u0009
-
\u000D
\u0020
-
\u002F
\u003A
-
\u0040
\u005B
-
\u0060
\u007B
-
\u007E
]"
)
# Cache for charsUntil()
charsUntilRegEx
=
{}
class
BufferedStream
(
object
):
"""Buffering for streams that do not have buffering of their own
The buffer is implemented as a list of chunks on the assumption that
joining many strings will be slow since it is O(n**2)
"""
def
__init__
(
self
,
stream
):
self
.
stream
=
stream
self
.
buffer
=
[]
self
.
position
=
[
-
1
,
0
]
# chunk number, offset
def
tell
(
self
):
pos
=
0
for
chunk
in
self
.
buffer
[:
self
.
position
[
0
]]:
pos
+=
len
(
chunk
)
pos
+=
self
.
position
[
1
]
return
pos
def
seek
(
self
,
pos
):
assert
pos
<=
self
.
_bufferedBytes
()
offset
=
pos
i
=
0
while
len
(
self
.
buffer
[
i
])
<
offset
:
offset
-=
len
(
self
.
buffer
[
i
])
i
+=
1
self
.
position
=
[
i
,
offset
]
def
read
(
self
,
bytes
):
if
not
self
.
buffer
:
return
self
.
_readStream
(
bytes
)
elif
(
self
.
position
[
0
]
==
len
(
self
.
buffer
)
and
self
.
position
[
1
]
==
len
(
self
.
buffer
[
-
1
])):
return
self
.
_readStream
(
bytes
)
else
:
return
self
.
_readFromBuffer
(
bytes
)
def
_bufferedBytes
(
self
):
return
sum
([
len
(
item
)
for
item
in
self
.
buffer
])
def
_readStream
(
self
,
bytes
):
data
=
self
.
stream
.
read
(
bytes
)
self
.
buffer
.
append
(
data
)
self
.
position
[
0
]
+=
1
self
.
position
[
1
]
=
len
(
data
)
return
data
def
_readFromBuffer
(
self
,
bytes
):
remainingBytes
=
bytes
rv
=
[]
bufferIndex
=
self
.
position
[
0
]
bufferOffset
=
self
.
position
[
1
]
while
bufferIndex
<
len
(
self
.
buffer
)
and
remainingBytes
!=
0
:
assert
remainingBytes
>
0
bufferedData
=
self
.
buffer
[
bufferIndex
]
if
remainingBytes
<=
len
(
bufferedData
)
-
bufferOffset
:
bytesToRead
=
remainingBytes
self
.
position
=
[
bufferIndex
,
bufferOffset
+
bytesToRead
]
else
:
bytesToRead
=
len
(
bufferedData
)
-
bufferOffset
self
.
position
=
[
bufferIndex
,
len
(
bufferedData
)]
bufferIndex
+=
1
rv
.
append
(
bufferedData
[
bufferOffset
:
bufferOffset
+
bytesToRead
])
remainingBytes
-=
bytesToRead
bufferOffset
=
0
if
remainingBytes
:
rv
.
append
(
self
.
_readStream
(
remainingBytes
))
return
b""
.
join
(
rv
)
def
HTMLInputStream
(
source
,
**
kwargs
):
# Work around Python bug #20007: read(0) closes the connection.
# http://bugs.python.org/issue20007
if
(
isinstance
(
source
,
http_client
.
HTTPResponse
)
or
# Also check for addinfourl wrapping HTTPResponse
(
isinstance
(
source
,
urllib
.
response
.
addbase
)
and
isinstance
(
source
.
fp
,
http_client
.
HTTPResponse
))):
isUnicode
=
False
elif
hasattr
(
source
,
"read"
):
isUnicode
=
isinstance
(
source
.
read
(
0
),
text_type
)
else
:
isUnicode
=
isinstance
(
source
,
text_type
)
if
isUnicode
:
encodings
=
[
x
for
x
in
kwargs
if
x
.
endswith
(
"_encoding"
)]
if
encodings
:
raise
TypeError
(
"Cannot set an encoding with a unicode input, set %r"
%
encodings
)
return
HTMLUnicodeInputStream
(
source
,
**
kwargs
)
else
:
return
HTMLBinaryInputStream
(
source
,
**
kwargs
)
class
HTMLUnicodeInputStream
(
object
):
"""Provides a unicode stream of characters to the HTMLTokenizer.
This class takes care of character encoding and removing or replacing
incorrect byte-sequences and also provides column and line tracking.
"""
_defaultChunkSize
=
10240
def
__init__
(
self
,
source
):
"""Initialises the HTMLInputStream.
HTMLInputStream(source, [encoding]) -> Normalized stream from source
for use by html5lib.
source can be either a file-object, local filename or a string.
The optional encoding parameter must be a string that indicates
the encoding. If specified, that encoding will be used,
regardless of any BOM or later declaration (such as in a meta
element)
"""
if
not
_utils
.
supports_lone_surrogates
:
# Such platforms will have already checked for such
# surrogate errors, so no need to do this checking.
self
.
reportCharacterErrors
=
None
elif
len
(
"
\U0010FFFF
"
)
==
1
:
self
.
reportCharacterErrors
=
self
.
characterErrorsUCS4
else
:
self
.
reportCharacterErrors
=
self
.
characterErrorsUCS2
# List of where new lines occur
self
.
newLines
=
[
0
]
self
.
charEncoding
=
(
lookupEncoding
(
"utf-8"
),
"certain"
)
self
.
dataStream
=
self
.
openStream
(
source
)
self
.
reset
()
def
reset
(
self
):
self
.
chunk
=
""
self
.
chunkSize
=
0
self
.
chunkOffset
=
0
self
.
errors
=
[]
# number of (complete) lines in previous chunks
self
.
prevNumLines
=
0
# number of columns in the last line of the previous chunk
self
.
prevNumCols
=
0
# Deal with CR LF and surrogates split over chunk boundaries
self
.
_bufferedCharacter
=
None
def
openStream
(
self
,
source
):
"""Produces a file object from source.
source can be either a file object, local filename or a string.
"""
# Already a file object
if
hasattr
(
source
,
'read'
):
stream
=
source
else
:
stream
=
StringIO
(
source
)
return
stream
def
_position
(
self
,
offset
):
chunk
=
self
.
chunk
nLines
=
chunk
.
count
(
'
\n
'
,
0
,
offset
)
positionLine
=
self
.
prevNumLines
+
nLines
lastLinePos
=
chunk
.
rfind
(
'
\n
'
,
0
,
offset
)
if
lastLinePos
==
-
1
:
positionColumn
=
self
.
prevNumCols
+
offset
else
:
positionColumn
=
offset
-
(
lastLinePos
+
1
)
return
(
positionLine
,
positionColumn
)
def
position
(
self
):
"""Returns (line, col) of the current position in the stream."""
line
,
col
=
self
.
_position
(
self
.
chunkOffset
)
return
(
line
+
1
,
col
)
def
char
(
self
):
""" Read one character from the stream or queue if available. Return
EOF when EOF is reached.
"""
# Read a new chunk from the input stream if necessary
if
self
.
chunkOffset
>=
self
.
chunkSize
:
if
not
self
.
readChunk
():
return
EOF
chunkOffset
=
self
.
chunkOffset
char
=
self
.
chunk
[
chunkOffset
]
self
.
chunkOffset
=
chunkOffset
+
1
return
char
def
readChunk
(
self
,
chunkSize
=
None
):
if
chunkSize
is
None
:
chunkSize
=
self
.
_defaultChunkSize
self
.
prevNumLines
,
self
.
prevNumCols
=
self
.
_position
(
self
.
chunkSize
)
self
.
chunk
=
""
self
.
chunkSize
=
0
self
.
chunkOffset
=
0
data
=
self
.
dataStream
.
read
(
chunkSize
)
# Deal with CR LF and surrogates broken across chunks
if
self
.
_bufferedCharacter
:
data
=
self
.
_bufferedCharacter
+
data
self
.
_bufferedCharacter
=
None
elif
not
data
:
# We have no more data, bye-bye stream
return
False
if
len
(
data
)
>
1
:
lastv
=
ord
(
data
[
-
1
])
if
lastv
==
0x0D
or
0xD800
<=
lastv
<=
0xDBFF
:
self
.
_bufferedCharacter
=
data
[
-
1
]
data
=
data
[:
-
1
]
if
self
.
reportCharacterErrors
:
self
.
reportCharacterErrors
(
data
)
# Replace invalid characters
data
=
data
.
replace
(
"
\r
\n
"
,
"
\n
"
)
data
=
data
.
replace
(
"
\r
"
,
"
\n
"
)
self
.
chunk
=
data
self
.
chunkSize
=
len
(
data
)
return
True
def
characterErrorsUCS4
(
self
,
data
):
for
_
in
range
(
len
(
invalid_unicode_re
.
findall
(
data
))):
self
.
errors
.
append
(
"invalid-codepoint"
)
def
characterErrorsUCS2
(
self
,
data
):
# Someone picked the wrong compile option
# You lose
skip
=
False
for
match
in
invalid_unicode_re
.
finditer
(
data
):
if
skip
:
continue
codepoint
=
ord
(
match
.
group
())
pos
=
match
.
start
()
# Pretty sure there should be endianness issues here
if
_utils
.
isSurrogatePair
(
data
[
pos
:
pos
+
2
]):
# We have a surrogate pair!
char_val
=
_utils
.
surrogatePairToCodepoint
(
data
[
pos
:
pos
+
2
])
if
char_val
in
non_bmp_invalid_codepoints
:
self
.
errors
.
append
(
"invalid-codepoint"
)
skip
=
True
elif
(
codepoint
>=
0xD800
and
codepoint
<=
0xDFFF
and
pos
==
len
(
data
)
-
1
):
self
.
errors
.
append
(
"invalid-codepoint"
)
else
:
skip
=
False
self
.
errors
.
append
(
"invalid-codepoint"
)
def
charsUntil
(
self
,
characters
,
opposite
=
False
):
""" Returns a string of characters from the stream up to but not
including any character in 'characters' or EOF. 'characters' must be
a container that supports the 'in' method and iteration over its
characters.
"""
# Use a cache of regexps to find the required characters
try
:
chars
=
charsUntilRegEx
[(
characters
,
opposite
)]
except
KeyError
:
if
__debug__
:
for
c
in
characters
:
assert
(
ord
(
c
)
<
128
)
regex
=
""
.
join
([
"
\\
x%02x"
%
ord
(
c
)
for
c
in
characters
])
if
not
opposite
:
regex
=
"^%s"
%
regex
chars
=
charsUntilRegEx
[(
characters
,
opposite
)]
=
re
.
compile
(
"[%s]+"
%
regex
)
rv
=
[]
while
True
:
# Find the longest matching prefix
m
=
chars
.
match
(
self
.
chunk
,
self
.
chunkOffset
)
if
m
is
None
:
# If nothing matched, and it wasn't because we ran out of chunk,
# then stop
if
self
.
chunkOffset
!=
self
.
chunkSize
:
break
else
:
end
=
m
.
end
()
# If not the whole chunk matched, return everything
# up to the part that didn't match
if
end
!=
self
.
chunkSize
:
rv
.
append
(
self
.
chunk
[
self
.
chunkOffset
:
end
])
self
.
chunkOffset
=
end
break
# If the whole remainder of the chunk matched,
# use it all and read the next chunk
rv
.
append
(
self
.
chunk
[
self
.
chunkOffset
:])
if
not
self
.
readChunk
():
# Reached EOF
break
r
=
""
.
join
(
rv
)
return
r
def
unget
(
self
,
char
):
# Only one character is allowed to be ungotten at once - it must
# be consumed again before any further call to unget
if
char
is
not
None
:
if
self
.
chunkOffset
==
0
:
# unget is called quite rarely, so it's a good idea to do
# more work here if it saves a bit of work in the frequently
# called char and charsUntil.
# So, just prepend the ungotten character onto the current
# chunk:
self
.
chunk
=
char
+
self
.
chunk
self
.
chunkSize
+=
1
else
:
self
.
chunkOffset
-=
1
assert
self
.
chunk
[
self
.
chunkOffset
]
==
char
class
HTMLBinaryInputStream
(
HTMLUnicodeInputStream
):
"""Provides a unicode stream of characters to the HTMLTokenizer.
This class takes care of character encoding and removing or replacing
incorrect byte-sequences and also provides column and line tracking.
"""
def
__init__
(
self
,
source
,
override_encoding
=
None
,
transport_encoding
=
None
,
same_origin_parent_encoding
=
None
,
likely_encoding
=
None
,
default_encoding
=
"windows-1252"
,
useChardet
=
True
):
"""Initialises the HTMLInputStream.
HTMLInputStream(source, [encoding]) -> Normalized stream from source
for use by html5lib.
source can be either a file-object, local filename or a string.
The optional encoding parameter must be a string that indicates
the encoding. If specified, that encoding will be used,
regardless of any BOM or later declaration (such as in a meta
element)
"""
# Raw Stream - for unicode objects this will encode to utf-8 and set
# self.charEncoding as appropriate
self
.
rawStream
=
self
.
openStream
(
source
)
HTMLUnicodeInputStream
.
__init__
(
self
,
self
.
rawStream
)
# Encoding Information
# Number of bytes to use when looking for a meta element with
# encoding information
self
.
numBytesMeta
=
1024
# Number of bytes to use when using detecting encoding using chardet
self
.
numBytesChardet
=
100
# Things from args
self
.
override_encoding
=
override_encoding
self
.
transport_encoding
=
transport_encoding
self
.
same_origin_parent_encoding
=
same_origin_parent_encoding
self
.
likely_encoding
=
likely_encoding
self
.
default_encoding
=
default_encoding
# Determine encoding
self
.
charEncoding
=
self
.
determineEncoding
(
useChardet
)
assert
self
.
charEncoding
[
0
]
is
not
None
# Call superclass
self
.
reset
()
def
reset
(
self
):
self
.
dataStream
=
self
.
charEncoding
[
0
].
codec_info
.
streamreader
(
self
.
rawStream
,
'replace'
)
HTMLUnicodeInputStream
.
reset
(
self
)
def
openStream
(
self
,
source
):
"""Produces a file object from source.
source can be either a file object, local filename or a string.
"""
# Already a file object
if
hasattr
(
source
,
'read'
):
stream
=
source
else
:
stream
=
BytesIO
(
source
)
try
:
stream
.
seek
(
stream
.
tell
())
except
:
# pylint:disable=bare-except
stream
=
BufferedStream
(
stream
)
return
stream
def
determineEncoding
(
self
,
chardet
=
True
):
# BOMs take precedence over everything
# This will also read past the BOM if present
charEncoding
=
self
.
detectBOM
(),
"certain"
if
charEncoding
[
0
]
is
not
None
:
return
charEncoding
# If we've been overriden, we've been overriden
charEncoding
=
lookupEncoding
(
self
.
override_encoding
),
"certain"
if
charEncoding
[
0
]
is
not
None
:
return
charEncoding
# Now check the transport layer
charEncoding
=
lookupEncoding
(
self
.
transport_encoding
),
"certain"
if
charEncoding
[
0
]
is
not
None
:
return
charEncoding
# Look for meta elements with encoding information
charEncoding
=
self
.
detectEncodingMeta
(),
"tentative"
if
charEncoding
[
0
]
is
not
None
:
return
charEncoding
# Parent document encoding
charEncoding
=
lookupEncoding
(
self
.
same_origin_parent_encoding
),
"tentative"
if
charEncoding
[
0
]
is
not
None
and
not
charEncoding
[
0
].
name
.
startswith
(
"utf-16"
):
return
charEncoding
# "likely" encoding
charEncoding
=
lookupEncoding
(
self
.
likely_encoding
),
"tentative"
if
charEncoding
[
0
]
is
not
None
:
return
charEncoding
# Guess with chardet, if available
if
chardet
:
try
:
from
chardet
.
universaldetector
import
UniversalDetector
except
ImportError
:
pass
else
:
buffers
=
[]
detector
=
UniversalDetector
()
while
not
detector
.
done
:
buffer
=
self
.
rawStream
.
read
(
self
.
numBytesChardet
)
assert
isinstance
(
buffer
,
bytes
)
if
not
buffer
:
break
buffers
.
append
(
buffer
)
detector
.
feed
(
buffer
)
detector
.
close
()
encoding
=
lookupEncoding
(
detector
.
result
[
'encoding'
])
self
.
rawStream
.
seek
(
0
)
if
encoding
is
not
None
:
return
encoding
,
"tentative"
# Try the default encoding
charEncoding
=
lookupEncoding
(
self
.
default_encoding
),
"tentative"
if
charEncoding
[
0
]
is
not
None
:
return
charEncoding
# Fallback to html5lib's default if even that hasn't worked
return
lookupEncoding
(
"windows-1252"
),
"tentative"
def
changeEncoding
(
self
,
newEncoding
):
assert
self
.
charEncoding
[
1
]
!=
"certain"
newEncoding
=
lookupEncoding
(
newEncoding
)
if
newEncoding
is
None
:
return
if
newEncoding
.
name
in
(
"utf-16be"
,
"utf-16le"
):
newEncoding
=
lookupEncoding
(
"utf-8"
)
assert
newEncoding
is
not
None
elif
newEncoding
==
self
.
charEncoding
[
0
]:
self
.
charEncoding
=
(
self
.
charEncoding
[
0
],
"certain"
)
else
:
self
.
rawStream
.
seek
(
0
)
self
.
charEncoding
=
(
newEncoding
,
"certain"
)
self
.
reset
()
raise
ReparseException
(
"Encoding changed from %s to %s"
%
(
self
.
charEncoding
[
0
],
newEncoding
))
def
detectBOM
(
self
):
"""Attempts to detect at BOM at the start of the stream. If
an encoding can be determined from the BOM return the name of the
encoding otherwise return None"""
bomDict
=
{
codecs
.
BOM_UTF8
:
'utf-8'
,
codecs
.
BOM_UTF16_LE
:
'utf-16le'
,
codecs
.
BOM_UTF16_BE
:
'utf-16be'
,
codecs
.
BOM_UTF32_LE
:
'utf-32le'
,
codecs
.
BOM_UTF32_BE
:
'utf-32be'
}
# Go to beginning of file and read in 4 bytes
string
=
self
.
rawStream
.
read
(
4
)
assert
isinstance
(
string
,
bytes
)
# Try detecting the BOM using bytes from the string
encoding
=
bomDict
.
get
(
string
[:
3
])
# UTF-8
seek
=
3
if
not
encoding
:
# Need to detect UTF-32 before UTF-16
encoding
=
bomDict
.
get
(
string
)
# UTF-32
seek
=
4
if
not
encoding
:
encoding
=
bomDict
.
get
(
string
[:
2
])
# UTF-16
seek
=
2
# Set the read position past the BOM if one was found, otherwise
# set it to the start of the stream
if
encoding
:
self
.
rawStream
.
seek
(
seek
)
return
lookupEncoding
(
encoding
)
else
:
self
.
rawStream
.
seek
(
0
)
return
None
def
detectEncodingMeta
(
self
):
"""Report the encoding declared by the meta element
"""
buffer
=
self
.
rawStream
.
read
(
self
.
numBytesMeta
)
assert
isinstance
(
buffer
,
bytes
)
parser
=
EncodingParser
(
buffer
)
self
.
rawStream
.
seek
(
0
)
encoding
=
parser
.
getEncoding
()
if
encoding
is
not
None
and
encoding
.
name
in
(
"utf-16be"
,
"utf-16le"
):
encoding
=
lookupEncoding
(
"utf-8"
)
return
encoding
class
EncodingBytes
(
bytes
):
"""String-like object with an associated position and various extra methods
If the position is ever greater than the string length then an exception is
raised"""
def
__new__
(
self
,
value
):
assert
isinstance
(
value
,
bytes
)
return
bytes
.
__new__
(
self
,
value
.
lower
())
def
__init__
(
self
,
value
):
# pylint:disable=unused-argument
self
.
_position
=
-
1
def
__iter__
(
self
):
return
self
def
__next__
(
self
):
p
=
self
.
_position
=
self
.
_position
+
1
if
p
>=
len
(
self
):
raise
StopIteration
elif
p
<
0
:
raise
TypeError
return
self
[
p
:
p
+
1
]
def
next
(
self
):
# Py2 compat
return
self
.
__next__
()
def
previous
(
self
):
p
=
self
.
_position
if
p
>=
len
(
self
):
raise
StopIteration
elif
p
<
0
:
raise
TypeError
self
.
_position
=
p
=
p
-
1
return
self
[
p
:
p
+
1
]
def
setPosition
(
self
,
position
):
if
self
.
_position
>=
len
(
self
):
raise
StopIteration
self
.
_position
=
position
def
getPosition
(
self
):
if
self
.
_position
>=
len
(
self
):
raise
StopIteration
if
self
.
_position
>=
0
:
return
self
.
_position
else
:
return
None
position
=
property
(
getPosition
,
setPosition
)
def
getCurrentByte
(
self
):
return
self
[
self
.
position
:
self
.
position
+
1
]
currentByte
=
property
(
getCurrentByte
)
def
skip
(
self
,
chars
=
spaceCharactersBytes
):
"""Skip past a list of characters"""
p
=
self
.
position
# use property for the error-checking
while
p
<
len
(
self
):
c
=
self
[
p
:
p
+
1
]
if
c
not
in
chars
:
self
.
_position
=
p
return
c
p
+=
1
self
.
_position
=
p
return
None
def
skipUntil
(
self
,
chars
):
p
=
self
.
position
while
p
<
len
(
self
):
c
=
self
[
p
:
p
+
1
]
if
c
in
chars
:
self
.
_position
=
p
return
c
p
+=
1
self
.
_position
=
p
return
None
def
matchBytes
(
self
,
bytes
):
"""Look for a sequence of bytes at the start of a string. If the bytes
are found return True and advance the position to the byte after the
match. Otherwise return False and leave the position alone"""
p
=
self
.
position
data
=
self
[
p
:
p
+
len
(
bytes
)]
rv
=
data
.
startswith
(
bytes
)
if
rv
:
self
.
position
+=
len
(
bytes
)
return
rv
def
jumpTo
(
self
,
bytes
):
"""Look for the next sequence of bytes matching a given sequence. If
a match is found advance the position to the last byte of the match"""
newPosition
=
self
[
self
.
position
:].
find
(
bytes
)
if
newPosition
>
-
1
:
# XXX: This is ugly, but I can't see a nicer way to fix this.
if
self
.
_position
==
-
1
:
self
.
_position
=
0
self
.
_position
+=
(
newPosition
+
len
(
bytes
)
-
1
)
return
True
else
:
raise
StopIteration
class
EncodingParser
(
object
):
"""Mini parser for detecting character encoding from meta elements"""
def
__init__
(
self
,
data
):
"""string - the data to work on for encoding detection"""
self
.
data
=
EncodingBytes
(
data
)
self
.
encoding
=
None
def
getEncoding
(
self
):
methodDispatch
=
(
(
b"<!--"
,
self
.
handleComment
),
(
b"<meta"
,
self
.
handleMeta
),
(
b"</"
,
self
.
handlePossibleEndTag
),
(
b"<!"
,
self
.
handleOther
),
(
b"<?"
,
self
.
handleOther
),
(
b"<"
,
self
.
handlePossibleStartTag
))
for
_
in
self
.
data
:
keepParsing
=
True
for
key
,
method
in
methodDispatch
:
if
self
.
data
.
matchBytes
(
key
):
try
:
keepParsing
=
method
()
break
except
StopIteration
:
keepParsing
=
False
break
if
not
keepParsing
:
break
return
self
.
encoding
def
handleComment
(
self
):
"""Skip over comments"""
return
self
.
data
.
jumpTo
(
b"-->"
)
def
handleMeta
(
self
):
if
self
.
data
.
currentByte
not
in
spaceCharactersBytes
:
# if we have <meta not followed by a space so just keep going
return
True
# We have a valid meta element we want to search for attributes
hasPragma
=
False
pendingEncoding
=
None
while
True
:
# Try to find the next attribute after the current position
attr
=
self
.
getAttribute
()
if
attr
is
None
:
return
True
else
:
if
attr
[
0
]
==
b"http-equiv"
:
hasPragma
=
attr
[
1
]
==
b"content-type"
if
hasPragma
and
pendingEncoding
is
not
None
:
self
.
encoding
=
pendingEncoding
return
False
elif
attr
[
0
]
==
b"charset"
:
tentativeEncoding
=
attr
[
1
]
codec
=
lookupEncoding
(
tentativeEncoding
)
if
codec
is
not
None
:
self
.
encoding
=
codec
return
False
elif
attr
[
0
]
==
b"content"
:
contentParser
=
ContentAttrParser
(
EncodingBytes
(
attr
[
1
]))
tentativeEncoding
=
contentParser
.
parse
()
if
tentativeEncoding
is
not
None
:
codec
=
lookupEncoding
(
tentativeEncoding
)
if
codec
is
not
None
:
if
hasPragma
:
self
.
encoding
=
codec
return
False
else
:
pendingEncoding
=
codec
def
handlePossibleStartTag
(
self
):
return
self
.
handlePossibleTag
(
False
)
def
handlePossibleEndTag
(
self
):
next
(
self
.
data
)
return
self
.
handlePossibleTag
(
True
)
def
handlePossibleTag
(
self
,
endTag
):
data
=
self
.
data
if
data
.
currentByte
not
in
asciiLettersBytes
:
# If the next byte is not an ascii letter either ignore this
# fragment (possible start tag case) or treat it according to
# handleOther
if
endTag
:
data
.
previous
()
self
.
handleOther
()
return
True
c
=
data
.
skipUntil
(
spacesAngleBrackets
)
if
c
==
b"<"
:
# return to the first step in the overall "two step" algorithm
# reprocessing the < byte
data
.
previous
()
else
:
# Read all attributes
attr
=
self
.
getAttribute
()
while
attr
is
not
None
:
attr
=
self
.
getAttribute
()
return
True
def
handleOther
(
self
):
return
self
.
data
.
jumpTo
(
b">"
)
def
getAttribute
(
self
):
"""Return a name,value pair for the next attribute in the stream,
if one is found, or None"""
data
=
self
.
data
# Step 1 (skip chars)
c
=
data
.
skip
(
spaceCharactersBytes
|
frozenset
([
b"/"
]))
assert
c
is
None
or
len
(
c
)
==
1
# Step 2
if
c
in
(
b">"
,
None
):
return
None
# Step 3
attrName
=
[]
attrValue
=
[]
# Step 4 attribute name
while
True
:
if
c
==
b"="
and
attrName
:
break
elif
c
in
spaceCharactersBytes
:
# Step 6!
c
=
data
.
skip
()
break
elif
c
in
(
b"/"
,
b">"
):
return
b""
.
join
(
attrName
),
b""
elif
c
in
asciiUppercaseBytes
:
attrName
.
append
(
c
.
lower
())
elif
c
is
None
:
return
None
else
:
attrName
.
append
(
c
)
# Step 5
c
=
next
(
data
)
# Step 7
if
c
!=
b"="
:
data
.
previous
()
return
b""
.
join
(
attrName
),
b""
# Step 8
next
(
data
)
# Step 9
c
=
data
.
skip
()
# Step 10
if
c
in
(
b"'"
,
b'"'
):
# 10.1
quoteChar
=
c
while
True
:
# 10.2
c
=
next
(
data
)
# 10.3
if
c
==
quoteChar
:
next
(
data
)
return
b""
.
join
(
attrName
),
b""
.
join
(
attrValue
)
# 10.4
elif
c
in
asciiUppercaseBytes
:
attrValue
.
append
(
c
.
lower
())
# 10.5
else
:
attrValue
.
append
(
c
)
elif
c
==
b">"
:
return
b""
.
join
(
attrName
),
b""
elif
c
in
asciiUppercaseBytes
:
attrValue
.
append
(
c
.
lower
())
elif
c
is
None
:
return
None
else
:
attrValue
.
append
(
c
)
# Step 11
while
True
:
c
=
next
(
data
)
if
c
in
spacesAngleBrackets
:
return
b""
.
join
(
attrName
),
b""
.
join
(
attrValue
)
elif
c
in
asciiUppercaseBytes
:
attrValue
.
append
(
c
.
lower
())
elif
c
is
None
:
return
None
else
:
attrValue
.
append
(
c
)
class
ContentAttrParser
(
object
):
def
__init__
(
self
,
data
):
assert
isinstance
(
data
,
bytes
)
self
.
data
=
data
def
parse
(
self
):
try
:
# Check if the attr name is charset
# otherwise return
self
.
data
.
jumpTo
(
b"charset"
)
self
.
data
.
position
+=
1
self
.
data
.
skip
()
if
not
self
.
data
.
currentByte
==
b"="
:
# If there is no = sign keep looking for attrs
return
None
self
.
data
.
position
+=
1
self
.
data
.
skip
()
# Look for an encoding between matching quote marks
if
self
.
data
.
currentByte
in
(
b'"'
,
b"'"
):
quoteMark
=
self
.
data
.
currentByte
self
.
data
.
position
+=
1
oldPosition
=
self
.
data
.
position
if
self
.
data
.
jumpTo
(
quoteMark
):
return
self
.
data
[
oldPosition
:
self
.
data
.
position
]
else
:
return
None
else
:
# Unquoted value
oldPosition
=
self
.
data
.
position
try
:
self
.
data
.
skipUntil
(
spaceCharactersBytes
)
return
self
.
data
[
oldPosition
:
self
.
data
.
position
]
except
StopIteration
:
# Return the whole remaining value
return
self
.
data
[
oldPosition
:]
except
StopIteration
:
return
None
def
lookupEncoding
(
encoding
):
"""Return the python codec name corresponding to an encoding or None if the
string doesn't correspond to a valid encoding."""
if
isinstance
(
encoding
,
binary_type
):
try
:
encoding
=
encoding
.
decode
(
"ascii"
)
except
UnicodeDecodeError
:
return
None
if
encoding
is
not
None
:
try
:
return
webencodings
.
lookup
(
encoding
)
except
AttributeError
:
return
None
else
:
return
None
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