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Edit: reader.py
# 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. __all__ = ['Reader', 'ReaderError'] from .error import YAMLError, Mark import codecs, re class ReaderError(YAMLError): def __init__(self, name, position, character, encoding, reason): self.name = name self.character = character self.position = position self.encoding = encoding self.reason = reason def __str__(self): if isinstance(self.character, bytes): 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 `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): self.name = None self.stream = None self.stream_pointer = 0 self.eof = True self.buffer = '' self.pointer = 0 self.raw_buffer = None self.raw_decode = None self.encoding = None self.index = 0 self.line = 0 self.column = 0 if isinstance(stream, str): self.name = "<unicode string>" self.check_printable(stream) self.buffer = stream+'\0' elif isinstance(stream, bytes): self.name = "<byte string>" self.raw_buffer = stream self.determine_encoding() else: self.stream = stream self.name = getattr(stream, 'name', "<file>") self.eof = False self.raw_buffer = None self.determine_encoding() def peek(self, index=0): try: return self.buffer[self.pointer+index] except IndexError: self.update(index+1) return self.buffer[self.pointer+index] def prefix(self, length=1): if self.pointer+length >= len(self.buffer): self.update(length) return self.buffer[self.pointer:self.pointer+length] def forward(self, length=1): if self.pointer+length+1 >= len(self.buffer): self.update(length+1) while length: 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 get_mark(self): if self.stream is None: return Mark(self.name, self.index, self.line, self.column, self.buffer, self.pointer) else: return Mark(self.name, self.index, self.line, self.column, None, None) def determine_encoding(self): 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 self.encoding = 'utf-16-le' elif self.raw_buffer.startswith(codecs.BOM_UTF16_BE): self.raw_decode = codecs.utf_16_be_decode self.encoding = 'utf-16-be' else: self.raw_decode = codecs.utf_8_decode self.encoding = 'utf-8' self.update(1) NON_PRINTABLE = re.compile('[^\x09\x0A\x0D\x20-\x7E\x85\xA0-\uD7FF\uE000-\uFFFD\U00010000-\U0010ffff]') def check_printable(self, data): match = self.NON_PRINTABLE.search(data) if match: character = match.group() position = self.index+(len(self.buffer)-self.pointer)+match.start() raise ReaderError(self.name, position, ord(character), 'unicode', "special characters are not allowed") def update(self, length): 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 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=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