mirror of https://github.com/morpheus65535/bazarr
1981 lines
70 KiB
Python
1981 lines
70 KiB
Python
# coding: utf-8
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from __future__ import print_function, absolute_import, division, unicode_literals
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# Scanner produces tokens of the following types:
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# STREAM-START
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# STREAM-END
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# DIRECTIVE(name, value)
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# DOCUMENT-START
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# DOCUMENT-END
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# BLOCK-SEQUENCE-START
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# BLOCK-MAPPING-START
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# BLOCK-END
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# FLOW-SEQUENCE-START
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# FLOW-MAPPING-START
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# FLOW-SEQUENCE-END
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# FLOW-MAPPING-END
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# BLOCK-ENTRY
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# FLOW-ENTRY
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# KEY
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# VALUE
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# ALIAS(value)
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# ANCHOR(value)
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# TAG(value)
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# SCALAR(value, plain, style)
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#
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# RoundTripScanner
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# COMMENT(value)
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#
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# Read comments in the Scanner code for more details.
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#
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from .error import MarkedYAMLError
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from .tokens import * # NOQA
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from .compat import utf8, unichr, PY3, check_anchorname_char, nprint # NOQA
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if False: # MYPY
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from typing import Any, Dict, Optional, List, Union, Text # NOQA
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from .compat import VersionType # NOQA
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__all__ = ['Scanner', 'RoundTripScanner', 'ScannerError']
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_THE_END = '\n\0\r\x85\u2028\u2029'
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_THE_END_SPACE_TAB = ' \n\0\t\r\x85\u2028\u2029'
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_SPACE_TAB = ' \t'
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class ScannerError(MarkedYAMLError):
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pass
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class SimpleKey(object):
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# See below simple keys treatment.
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def __init__(self, token_number, required, index, line, column, mark):
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# type: (Any, Any, int, int, int, Any) -> None
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self.token_number = token_number
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self.required = required
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self.index = index
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self.line = line
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self.column = column
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self.mark = mark
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class Scanner(object):
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def __init__(self, loader=None):
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# type: (Any) -> None
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"""Initialize the scanner."""
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# It is assumed that Scanner and Reader will have a common descendant.
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# Reader do the dirty work of checking for BOM and converting the
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# input data to Unicode. It also adds NUL to the end.
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#
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# Reader supports the following methods
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# self.peek(i=0) # peek the next i-th character
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# self.prefix(l=1) # peek the next l characters
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# self.forward(l=1) # read the next l characters and move the pointer
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self.loader = loader
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if self.loader is not None and getattr(self.loader, '_scanner', None) is None:
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self.loader._scanner = self
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self.reset_scanner()
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self.first_time = False
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self.yaml_version = None # type: Any
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@property
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def flow_level(self):
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# type: () -> int
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return len(self.flow_context)
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def reset_scanner(self):
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# type: () -> None
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# Had we reached the end of the stream?
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self.done = False
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# flow_context is an expanding/shrinking list consisting of '{' and '['
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# for each unclosed flow context. If empty list that means block context
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self.flow_context = [] # type: List[Text]
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# List of processed tokens that are not yet emitted.
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self.tokens = [] # type: List[Any]
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# Add the STREAM-START token.
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self.fetch_stream_start()
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# Number of tokens that were emitted through the `get_token` method.
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self.tokens_taken = 0
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# The current indentation level.
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self.indent = -1
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# Past indentation levels.
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self.indents = [] # type: List[int]
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# Variables related to simple keys treatment.
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# A simple key is a key that is not denoted by the '?' indicator.
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# Example of simple keys:
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# ---
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# block simple key: value
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# ? not a simple key:
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# : { flow simple key: value }
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# We emit the KEY token before all keys, so when we find a potential
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# simple key, we try to locate the corresponding ':' indicator.
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# Simple keys should be limited to a single line and 1024 characters.
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# Can a simple key start at the current position? A simple key may
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# start:
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# - at the beginning of the line, not counting indentation spaces
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# (in block context),
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# - after '{', '[', ',' (in the flow context),
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# - after '?', ':', '-' (in the block context).
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# In the block context, this flag also signifies if a block collection
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# may start at the current position.
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self.allow_simple_key = True
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# Keep track of possible simple keys. This is a dictionary. The key
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# is `flow_level`; there can be no more that one possible simple key
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# for each level. The value is a SimpleKey record:
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# (token_number, required, index, line, column, mark)
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# A simple key may start with ALIAS, ANCHOR, TAG, SCALAR(flow),
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# '[', or '{' tokens.
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self.possible_simple_keys = {} # type: Dict[Any, Any]
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@property
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def reader(self):
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# type: () -> Any
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try:
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return self._scanner_reader # type: ignore
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except AttributeError:
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if hasattr(self.loader, 'typ'):
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self._scanner_reader = self.loader.reader
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else:
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self._scanner_reader = self.loader._reader
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return self._scanner_reader
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@property
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def scanner_processing_version(self): # prefix until un-composited
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# type: () -> Any
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if hasattr(self.loader, 'typ'):
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return self.loader.resolver.processing_version
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return self.loader.processing_version
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# Public methods.
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def check_token(self, *choices):
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# type: (Any) -> bool
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# Check if the next token is one of the given types.
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while self.need_more_tokens():
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self.fetch_more_tokens()
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if bool(self.tokens):
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if not choices:
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return True
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for choice in choices:
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if isinstance(self.tokens[0], choice):
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return True
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return False
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def peek_token(self):
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# type: () -> Any
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# Return the next token, but do not delete if from the queue.
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while self.need_more_tokens():
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self.fetch_more_tokens()
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if bool(self.tokens):
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return self.tokens[0]
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def get_token(self):
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# type: () -> Any
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# Return the next token.
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while self.need_more_tokens():
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self.fetch_more_tokens()
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if bool(self.tokens):
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self.tokens_taken += 1
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return self.tokens.pop(0)
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# Private methods.
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def need_more_tokens(self):
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# type: () -> bool
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if self.done:
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return False
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if not self.tokens:
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return True
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# The current token may be a potential simple key, so we
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# need to look further.
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self.stale_possible_simple_keys()
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if self.next_possible_simple_key() == self.tokens_taken:
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return True
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return False
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def fetch_comment(self, comment):
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# type: (Any) -> None
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raise NotImplementedError
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def fetch_more_tokens(self):
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# type: () -> Any
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# Eat whitespaces and comments until we reach the next token.
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comment = self.scan_to_next_token()
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if comment is not None: # never happens for base scanner
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return self.fetch_comment(comment)
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# Remove obsolete possible simple keys.
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self.stale_possible_simple_keys()
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# Compare the current indentation and column. It may add some tokens
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# and decrease the current indentation level.
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self.unwind_indent(self.reader.column)
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# Peek the next character.
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ch = self.reader.peek()
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# Is it the end of stream?
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if ch == '\0':
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return self.fetch_stream_end()
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# Is it a directive?
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if ch == '%' and self.check_directive():
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return self.fetch_directive()
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# Is it the document start?
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if ch == '-' and self.check_document_start():
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return self.fetch_document_start()
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# Is it the document end?
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if ch == '.' and self.check_document_end():
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return self.fetch_document_end()
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# TODO: support for BOM within a stream.
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# if ch == u'\uFEFF':
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# return self.fetch_bom() <-- issue BOMToken
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# Note: the order of the following checks is NOT significant.
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# Is it the flow sequence start indicator?
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if ch == '[':
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return self.fetch_flow_sequence_start()
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# Is it the flow mapping start indicator?
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if ch == '{':
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return self.fetch_flow_mapping_start()
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# Is it the flow sequence end indicator?
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if ch == ']':
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return self.fetch_flow_sequence_end()
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# Is it the flow mapping end indicator?
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if ch == '}':
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return self.fetch_flow_mapping_end()
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# Is it the flow entry indicator?
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if ch == ',':
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return self.fetch_flow_entry()
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# Is it the block entry indicator?
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if ch == '-' and self.check_block_entry():
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return self.fetch_block_entry()
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# Is it the key indicator?
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if ch == '?' and self.check_key():
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return self.fetch_key()
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# Is it the value indicator?
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if ch == ':' and self.check_value():
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return self.fetch_value()
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# Is it an alias?
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if ch == '*':
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return self.fetch_alias()
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# Is it an anchor?
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if ch == '&':
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return self.fetch_anchor()
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# Is it a tag?
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if ch == '!':
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return self.fetch_tag()
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# Is it a literal scalar?
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if ch == '|' and not self.flow_level:
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return self.fetch_literal()
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# Is it a folded scalar?
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if ch == '>' and not self.flow_level:
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return self.fetch_folded()
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# Is it a single quoted scalar?
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if ch == "'":
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return self.fetch_single()
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# Is it a double quoted scalar?
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if ch == '"':
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return self.fetch_double()
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# It must be a plain scalar then.
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if self.check_plain():
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return self.fetch_plain()
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# No? It's an error. Let's produce a nice error message.
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raise ScannerError(
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'while scanning for the next token',
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None,
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'found character %r that cannot start any token' % utf8(ch),
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self.reader.get_mark(),
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)
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# Simple keys treatment.
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def next_possible_simple_key(self):
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# type: () -> Any
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# Return the number of the nearest possible simple key. Actually we
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# don't need to loop through the whole dictionary. We may replace it
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# with the following code:
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# if not self.possible_simple_keys:
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# return None
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# return self.possible_simple_keys[
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# min(self.possible_simple_keys.keys())].token_number
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min_token_number = None
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for level in self.possible_simple_keys:
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key = self.possible_simple_keys[level]
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if min_token_number is None or key.token_number < min_token_number:
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min_token_number = key.token_number
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return min_token_number
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def stale_possible_simple_keys(self):
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# type: () -> None
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# Remove entries that are no longer possible simple keys. According to
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# the YAML specification, simple keys
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# - should be limited to a single line,
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# - should be no longer than 1024 characters.
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# Disabling this procedure will allow simple keys of any length and
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# height (may cause problems if indentation is broken though).
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for level in list(self.possible_simple_keys):
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key = self.possible_simple_keys[level]
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if key.line != self.reader.line or self.reader.index - key.index > 1024:
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if key.required:
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raise ScannerError(
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'while scanning a simple key',
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key.mark,
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"could not find expected ':'",
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self.reader.get_mark(),
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)
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del self.possible_simple_keys[level]
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def save_possible_simple_key(self):
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# type: () -> None
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# The next token may start a simple key. We check if it's possible
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# and save its position. This function is called for
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# ALIAS, ANCHOR, TAG, SCALAR(flow), '[', and '{'.
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# Check if a simple key is required at the current position.
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required = not self.flow_level and self.indent == self.reader.column
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# The next token might be a simple key. Let's save it's number and
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# position.
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if self.allow_simple_key:
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self.remove_possible_simple_key()
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token_number = self.tokens_taken + len(self.tokens)
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key = SimpleKey(
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token_number,
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required,
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self.reader.index,
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self.reader.line,
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self.reader.column,
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self.reader.get_mark(),
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)
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self.possible_simple_keys[self.flow_level] = key
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def remove_possible_simple_key(self):
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# type: () -> None
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# Remove the saved possible key position at the current flow level.
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if self.flow_level in self.possible_simple_keys:
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key = self.possible_simple_keys[self.flow_level]
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if key.required:
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raise ScannerError(
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'while scanning a simple key',
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key.mark,
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"could not find expected ':'",
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self.reader.get_mark(),
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)
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del self.possible_simple_keys[self.flow_level]
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# Indentation functions.
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def unwind_indent(self, column):
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# type: (Any) -> None
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# In flow context, tokens should respect indentation.
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# Actually the condition should be `self.indent >= column` according to
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# the spec. But this condition will prohibit intuitively correct
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# constructions such as
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# key : {
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# }
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# ####
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# if self.flow_level and self.indent > column:
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# raise ScannerError(None, None,
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# "invalid intendation or unclosed '[' or '{'",
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# self.reader.get_mark())
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# In the flow context, indentation is ignored. We make the scanner less
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# restrictive then specification requires.
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if bool(self.flow_level):
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return
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# In block context, we may need to issue the BLOCK-END tokens.
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while self.indent > column:
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mark = self.reader.get_mark()
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self.indent = self.indents.pop()
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self.tokens.append(BlockEndToken(mark, mark))
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def add_indent(self, column):
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# type: (int) -> bool
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# Check if we need to increase indentation.
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if self.indent < column:
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self.indents.append(self.indent)
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self.indent = column
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return True
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return False
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# Fetchers.
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def fetch_stream_start(self):
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# type: () -> None
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# We always add STREAM-START as the first token and STREAM-END as the
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# last token.
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# Read the token.
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mark = self.reader.get_mark()
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# Add STREAM-START.
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self.tokens.append(StreamStartToken(mark, mark, encoding=self.reader.encoding))
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def fetch_stream_end(self):
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# type: () -> None
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# Set the current intendation to -1.
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self.unwind_indent(-1)
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# Reset simple keys.
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self.remove_possible_simple_key()
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self.allow_simple_key = False
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self.possible_simple_keys = {}
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# Read the token.
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mark = self.reader.get_mark()
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# Add STREAM-END.
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self.tokens.append(StreamEndToken(mark, mark))
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# The steam is finished.
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self.done = True
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def fetch_directive(self):
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# type: () -> None
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# Set the current intendation to -1.
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self.unwind_indent(-1)
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# Reset simple keys.
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self.remove_possible_simple_key()
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self.allow_simple_key = False
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# Scan and add DIRECTIVE.
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self.tokens.append(self.scan_directive())
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def fetch_document_start(self):
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# type: () -> None
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self.fetch_document_indicator(DocumentStartToken)
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def fetch_document_end(self):
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# type: () -> None
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self.fetch_document_indicator(DocumentEndToken)
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def fetch_document_indicator(self, TokenClass):
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# type: (Any) -> None
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# Set the current intendation to -1.
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self.unwind_indent(-1)
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# Reset simple keys. Note that there could not be a block collection
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# after '---'.
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self.remove_possible_simple_key()
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self.allow_simple_key = False
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# Add DOCUMENT-START or DOCUMENT-END.
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start_mark = self.reader.get_mark()
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self.reader.forward(3)
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end_mark = self.reader.get_mark()
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self.tokens.append(TokenClass(start_mark, end_mark))
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def fetch_flow_sequence_start(self):
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# type: () -> None
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self.fetch_flow_collection_start(FlowSequenceStartToken, to_push='[')
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def fetch_flow_mapping_start(self):
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# type: () -> None
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self.fetch_flow_collection_start(FlowMappingStartToken, to_push='{')
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def fetch_flow_collection_start(self, TokenClass, to_push):
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# type: (Any, Text) -> None
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# '[' and '{' may start a simple key.
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self.save_possible_simple_key()
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# Increase the flow level.
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self.flow_context.append(to_push)
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# Simple keys are allowed after '[' and '{'.
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self.allow_simple_key = True
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# Add FLOW-SEQUENCE-START or FLOW-MAPPING-START.
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start_mark = self.reader.get_mark()
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self.reader.forward()
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end_mark = self.reader.get_mark()
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self.tokens.append(TokenClass(start_mark, end_mark))
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def fetch_flow_sequence_end(self):
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# type: () -> None
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self.fetch_flow_collection_end(FlowSequenceEndToken)
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def fetch_flow_mapping_end(self):
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# type: () -> None
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self.fetch_flow_collection_end(FlowMappingEndToken)
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def fetch_flow_collection_end(self, TokenClass):
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# type: (Any) -> None
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# Reset possible simple key on the current level.
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self.remove_possible_simple_key()
|
|
# Decrease the flow level.
|
|
try:
|
|
popped = self.flow_context.pop() # NOQA
|
|
except IndexError:
|
|
# We must not be in a list or object.
|
|
# Defer error handling to the parser.
|
|
pass
|
|
# No simple keys after ']' or '}'.
|
|
self.allow_simple_key = False
|
|
# Add FLOW-SEQUENCE-END or FLOW-MAPPING-END.
|
|
start_mark = self.reader.get_mark()
|
|
self.reader.forward()
|
|
end_mark = self.reader.get_mark()
|
|
self.tokens.append(TokenClass(start_mark, end_mark))
|
|
|
|
def fetch_flow_entry(self):
|
|
# type: () -> None
|
|
# Simple keys are allowed after ','.
|
|
self.allow_simple_key = True
|
|
# Reset possible simple key on the current level.
|
|
self.remove_possible_simple_key()
|
|
# Add FLOW-ENTRY.
|
|
start_mark = self.reader.get_mark()
|
|
self.reader.forward()
|
|
end_mark = self.reader.get_mark()
|
|
self.tokens.append(FlowEntryToken(start_mark, end_mark))
|
|
|
|
def fetch_block_entry(self):
|
|
# type: () -> None
|
|
# Block context needs additional checks.
|
|
if not self.flow_level:
|
|
# Are we allowed to start a new entry?
|
|
if not self.allow_simple_key:
|
|
raise ScannerError(
|
|
None, None, 'sequence entries are not allowed here', self.reader.get_mark()
|
|
)
|
|
# We may need to add BLOCK-SEQUENCE-START.
|
|
if self.add_indent(self.reader.column):
|
|
mark = self.reader.get_mark()
|
|
self.tokens.append(BlockSequenceStartToken(mark, mark))
|
|
# It's an error for the block entry to occur in the flow context,
|
|
# but we let the parser detect this.
|
|
else:
|
|
pass
|
|
# Simple keys are allowed after '-'.
|
|
self.allow_simple_key = True
|
|
# Reset possible simple key on the current level.
|
|
self.remove_possible_simple_key()
|
|
|
|
# Add BLOCK-ENTRY.
|
|
start_mark = self.reader.get_mark()
|
|
self.reader.forward()
|
|
end_mark = self.reader.get_mark()
|
|
self.tokens.append(BlockEntryToken(start_mark, end_mark))
|
|
|
|
def fetch_key(self):
|
|
# type: () -> None
|
|
# Block context needs additional checks.
|
|
if not self.flow_level:
|
|
|
|
# Are we allowed to start a key (not nessesary a simple)?
|
|
if not self.allow_simple_key:
|
|
raise ScannerError(
|
|
None, None, 'mapping keys are not allowed here', self.reader.get_mark()
|
|
)
|
|
|
|
# We may need to add BLOCK-MAPPING-START.
|
|
if self.add_indent(self.reader.column):
|
|
mark = self.reader.get_mark()
|
|
self.tokens.append(BlockMappingStartToken(mark, mark))
|
|
|
|
# Simple keys are allowed after '?' in the block context.
|
|
self.allow_simple_key = not self.flow_level
|
|
|
|
# Reset possible simple key on the current level.
|
|
self.remove_possible_simple_key()
|
|
|
|
# Add KEY.
|
|
start_mark = self.reader.get_mark()
|
|
self.reader.forward()
|
|
end_mark = self.reader.get_mark()
|
|
self.tokens.append(KeyToken(start_mark, end_mark))
|
|
|
|
def fetch_value(self):
|
|
# type: () -> None
|
|
# Do we determine a simple key?
|
|
if self.flow_level in self.possible_simple_keys:
|
|
# Add KEY.
|
|
key = self.possible_simple_keys[self.flow_level]
|
|
del self.possible_simple_keys[self.flow_level]
|
|
self.tokens.insert(
|
|
key.token_number - self.tokens_taken, KeyToken(key.mark, key.mark)
|
|
)
|
|
|
|
# If this key starts a new block mapping, we need to add
|
|
# BLOCK-MAPPING-START.
|
|
if not self.flow_level:
|
|
if self.add_indent(key.column):
|
|
self.tokens.insert(
|
|
key.token_number - self.tokens_taken,
|
|
BlockMappingStartToken(key.mark, key.mark),
|
|
)
|
|
|
|
# There cannot be two simple keys one after another.
|
|
self.allow_simple_key = False
|
|
|
|
# It must be a part of a complex key.
|
|
else:
|
|
|
|
# Block context needs additional checks.
|
|
# (Do we really need them? They will be caught by the parser
|
|
# anyway.)
|
|
if not self.flow_level:
|
|
|
|
# We are allowed to start a complex value if and only if
|
|
# we can start a simple key.
|
|
if not self.allow_simple_key:
|
|
raise ScannerError(
|
|
None,
|
|
None,
|
|
'mapping values are not allowed here',
|
|
self.reader.get_mark(),
|
|
)
|
|
|
|
# If this value starts a new block mapping, we need to add
|
|
# BLOCK-MAPPING-START. It will be detected as an error later by
|
|
# the parser.
|
|
if not self.flow_level:
|
|
if self.add_indent(self.reader.column):
|
|
mark = self.reader.get_mark()
|
|
self.tokens.append(BlockMappingStartToken(mark, mark))
|
|
|
|
# Simple keys are allowed after ':' in the block context.
|
|
self.allow_simple_key = not self.flow_level
|
|
|
|
# Reset possible simple key on the current level.
|
|
self.remove_possible_simple_key()
|
|
|
|
# Add VALUE.
|
|
start_mark = self.reader.get_mark()
|
|
self.reader.forward()
|
|
end_mark = self.reader.get_mark()
|
|
self.tokens.append(ValueToken(start_mark, end_mark))
|
|
|
|
def fetch_alias(self):
|
|
# type: () -> None
|
|
# ALIAS could be a simple key.
|
|
self.save_possible_simple_key()
|
|
# No simple keys after ALIAS.
|
|
self.allow_simple_key = False
|
|
# Scan and add ALIAS.
|
|
self.tokens.append(self.scan_anchor(AliasToken))
|
|
|
|
def fetch_anchor(self):
|
|
# type: () -> None
|
|
# ANCHOR could start a simple key.
|
|
self.save_possible_simple_key()
|
|
# No simple keys after ANCHOR.
|
|
self.allow_simple_key = False
|
|
# Scan and add ANCHOR.
|
|
self.tokens.append(self.scan_anchor(AnchorToken))
|
|
|
|
def fetch_tag(self):
|
|
# type: () -> None
|
|
# TAG could start a simple key.
|
|
self.save_possible_simple_key()
|
|
# No simple keys after TAG.
|
|
self.allow_simple_key = False
|
|
# Scan and add TAG.
|
|
self.tokens.append(self.scan_tag())
|
|
|
|
def fetch_literal(self):
|
|
# type: () -> None
|
|
self.fetch_block_scalar(style='|')
|
|
|
|
def fetch_folded(self):
|
|
# type: () -> None
|
|
self.fetch_block_scalar(style='>')
|
|
|
|
def fetch_block_scalar(self, style):
|
|
# type: (Any) -> None
|
|
# A simple key may follow a block scalar.
|
|
self.allow_simple_key = True
|
|
# Reset possible simple key on the current level.
|
|
self.remove_possible_simple_key()
|
|
# Scan and add SCALAR.
|
|
self.tokens.append(self.scan_block_scalar(style))
|
|
|
|
def fetch_single(self):
|
|
# type: () -> None
|
|
self.fetch_flow_scalar(style="'")
|
|
|
|
def fetch_double(self):
|
|
# type: () -> None
|
|
self.fetch_flow_scalar(style='"')
|
|
|
|
def fetch_flow_scalar(self, style):
|
|
# type: (Any) -> None
|
|
# A flow scalar could be a simple key.
|
|
self.save_possible_simple_key()
|
|
# No simple keys after flow scalars.
|
|
self.allow_simple_key = False
|
|
# Scan and add SCALAR.
|
|
self.tokens.append(self.scan_flow_scalar(style))
|
|
|
|
def fetch_plain(self):
|
|
# type: () -> None
|
|
# A plain scalar could be a simple key.
|
|
self.save_possible_simple_key()
|
|
# No simple keys after plain scalars. But note that `scan_plain` will
|
|
# change this flag if the scan is finished at the beginning of the
|
|
# line.
|
|
self.allow_simple_key = False
|
|
# Scan and add SCALAR. May change `allow_simple_key`.
|
|
self.tokens.append(self.scan_plain())
|
|
|
|
# Checkers.
|
|
|
|
def check_directive(self):
|
|
# type: () -> Any
|
|
# DIRECTIVE: ^ '%' ...
|
|
# The '%' indicator is already checked.
|
|
if self.reader.column == 0:
|
|
return True
|
|
return None
|
|
|
|
def check_document_start(self):
|
|
# type: () -> Any
|
|
# DOCUMENT-START: ^ '---' (' '|'\n')
|
|
if self.reader.column == 0:
|
|
if self.reader.prefix(3) == '---' and self.reader.peek(3) in _THE_END_SPACE_TAB:
|
|
return True
|
|
return None
|
|
|
|
def check_document_end(self):
|
|
# type: () -> Any
|
|
# DOCUMENT-END: ^ '...' (' '|'\n')
|
|
if self.reader.column == 0:
|
|
if self.reader.prefix(3) == '...' and self.reader.peek(3) in _THE_END_SPACE_TAB:
|
|
return True
|
|
return None
|
|
|
|
def check_block_entry(self):
|
|
# type: () -> Any
|
|
# BLOCK-ENTRY: '-' (' '|'\n')
|
|
return self.reader.peek(1) in _THE_END_SPACE_TAB
|
|
|
|
def check_key(self):
|
|
# type: () -> Any
|
|
# KEY(flow context): '?'
|
|
if bool(self.flow_level):
|
|
return True
|
|
# KEY(block context): '?' (' '|'\n')
|
|
return self.reader.peek(1) in _THE_END_SPACE_TAB
|
|
|
|
def check_value(self):
|
|
# type: () -> Any
|
|
# VALUE(flow context): ':'
|
|
if self.scanner_processing_version == (1, 1):
|
|
if bool(self.flow_level):
|
|
return True
|
|
else:
|
|
if bool(self.flow_level):
|
|
if self.flow_context[-1] == '[':
|
|
if self.reader.peek(1) not in _THE_END_SPACE_TAB:
|
|
return False
|
|
elif self.tokens and isinstance(self.tokens[-1], ValueToken):
|
|
# mapping flow context scanning a value token
|
|
if self.reader.peek(1) not in _THE_END_SPACE_TAB:
|
|
return False
|
|
return True
|
|
# VALUE(block context): ':' (' '|'\n')
|
|
return self.reader.peek(1) in _THE_END_SPACE_TAB
|
|
|
|
def check_plain(self):
|
|
# type: () -> Any
|
|
# A plain scalar may start with any non-space character except:
|
|
# '-', '?', ':', ',', '[', ']', '{', '}',
|
|
# '#', '&', '*', '!', '|', '>', '\'', '\"',
|
|
# '%', '@', '`'.
|
|
#
|
|
# It may also start with
|
|
# '-', '?', ':'
|
|
# if it is followed by a non-space character.
|
|
#
|
|
# Note that we limit the last rule to the block context (except the
|
|
# '-' character) because we want the flow context to be space
|
|
# independent.
|
|
srp = self.reader.peek
|
|
ch = srp()
|
|
if self.scanner_processing_version == (1, 1):
|
|
return ch not in '\0 \t\r\n\x85\u2028\u2029-?:,[]{}#&*!|>\'"%@`' or (
|
|
srp(1) not in _THE_END_SPACE_TAB
|
|
and (ch == '-' or (not self.flow_level and ch in '?:'))
|
|
)
|
|
# YAML 1.2
|
|
if ch not in '\0 \t\r\n\x85\u2028\u2029-?:,[]{}#&*!|>\'"%@`':
|
|
# ################### ^ ???
|
|
return True
|
|
ch1 = srp(1)
|
|
if ch == '-' and ch1 not in _THE_END_SPACE_TAB:
|
|
return True
|
|
if ch == ':' and bool(self.flow_level) and ch1 not in _SPACE_TAB:
|
|
return True
|
|
|
|
return srp(1) not in _THE_END_SPACE_TAB and (
|
|
ch == '-' or (not self.flow_level and ch in '?:')
|
|
)
|
|
|
|
# Scanners.
|
|
|
|
def scan_to_next_token(self):
|
|
# type: () -> Any
|
|
# We ignore spaces, line breaks and comments.
|
|
# If we find a line break in the block context, we set the flag
|
|
# `allow_simple_key` on.
|
|
# The byte order mark is stripped if it's the first character in the
|
|
# stream. We do not yet support BOM inside the stream as the
|
|
# specification requires. Any such mark will be considered as a part
|
|
# of the document.
|
|
#
|
|
# TODO: We need to make tab handling rules more sane. A good rule is
|
|
# Tabs cannot precede tokens
|
|
# BLOCK-SEQUENCE-START, BLOCK-MAPPING-START, BLOCK-END,
|
|
# KEY(block), VALUE(block), BLOCK-ENTRY
|
|
# So the checking code is
|
|
# if <TAB>:
|
|
# self.allow_simple_keys = False
|
|
# We also need to add the check for `allow_simple_keys == True` to
|
|
# `unwind_indent` before issuing BLOCK-END.
|
|
# Scanners for block, flow, and plain scalars need to be modified.
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
if self.reader.index == 0 and srp() == '\uFEFF':
|
|
srf()
|
|
found = False
|
|
_the_end = _THE_END
|
|
while not found:
|
|
while srp() == ' ':
|
|
srf()
|
|
if srp() == '#':
|
|
while srp() not in _the_end:
|
|
srf()
|
|
if self.scan_line_break():
|
|
if not self.flow_level:
|
|
self.allow_simple_key = True
|
|
else:
|
|
found = True
|
|
return None
|
|
|
|
def scan_directive(self):
|
|
# type: () -> Any
|
|
# See the specification for details.
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
start_mark = self.reader.get_mark()
|
|
srf()
|
|
name = self.scan_directive_name(start_mark)
|
|
value = None
|
|
if name == 'YAML':
|
|
value = self.scan_yaml_directive_value(start_mark)
|
|
end_mark = self.reader.get_mark()
|
|
elif name == 'TAG':
|
|
value = self.scan_tag_directive_value(start_mark)
|
|
end_mark = self.reader.get_mark()
|
|
else:
|
|
end_mark = self.reader.get_mark()
|
|
while srp() not in _THE_END:
|
|
srf()
|
|
self.scan_directive_ignored_line(start_mark)
|
|
return DirectiveToken(name, value, start_mark, end_mark)
|
|
|
|
def scan_directive_name(self, start_mark):
|
|
# type: (Any) -> Any
|
|
# See the specification for details.
|
|
length = 0
|
|
srp = self.reader.peek
|
|
ch = srp(length)
|
|
while '0' <= ch <= '9' or 'A' <= ch <= 'Z' or 'a' <= ch <= 'z' or ch in '-_:.':
|
|
length += 1
|
|
ch = srp(length)
|
|
if not length:
|
|
raise ScannerError(
|
|
'while scanning a directive',
|
|
start_mark,
|
|
'expected alphabetic or numeric character, but found %r' % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
value = self.reader.prefix(length)
|
|
self.reader.forward(length)
|
|
ch = srp()
|
|
if ch not in '\0 \r\n\x85\u2028\u2029':
|
|
raise ScannerError(
|
|
'while scanning a directive',
|
|
start_mark,
|
|
'expected alphabetic or numeric character, but found %r' % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
return value
|
|
|
|
def scan_yaml_directive_value(self, start_mark):
|
|
# type: (Any) -> Any
|
|
# See the specification for details.
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
while srp() == ' ':
|
|
srf()
|
|
major = self.scan_yaml_directive_number(start_mark)
|
|
if srp() != '.':
|
|
raise ScannerError(
|
|
'while scanning a directive',
|
|
start_mark,
|
|
"expected a digit or '.', but found %r" % utf8(srp()),
|
|
self.reader.get_mark(),
|
|
)
|
|
srf()
|
|
minor = self.scan_yaml_directive_number(start_mark)
|
|
if srp() not in '\0 \r\n\x85\u2028\u2029':
|
|
raise ScannerError(
|
|
'while scanning a directive',
|
|
start_mark,
|
|
"expected a digit or ' ', but found %r" % utf8(srp()),
|
|
self.reader.get_mark(),
|
|
)
|
|
self.yaml_version = (major, minor)
|
|
return self.yaml_version
|
|
|
|
def scan_yaml_directive_number(self, start_mark):
|
|
# type: (Any) -> Any
|
|
# See the specification for details.
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
ch = srp()
|
|
if not ('0' <= ch <= '9'):
|
|
raise ScannerError(
|
|
'while scanning a directive',
|
|
start_mark,
|
|
'expected a digit, but found %r' % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
length = 0
|
|
while '0' <= srp(length) <= '9':
|
|
length += 1
|
|
value = int(self.reader.prefix(length))
|
|
srf(length)
|
|
return value
|
|
|
|
def scan_tag_directive_value(self, start_mark):
|
|
# type: (Any) -> Any
|
|
# See the specification for details.
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
while srp() == ' ':
|
|
srf()
|
|
handle = self.scan_tag_directive_handle(start_mark)
|
|
while srp() == ' ':
|
|
srf()
|
|
prefix = self.scan_tag_directive_prefix(start_mark)
|
|
return (handle, prefix)
|
|
|
|
def scan_tag_directive_handle(self, start_mark):
|
|
# type: (Any) -> Any
|
|
# See the specification for details.
|
|
value = self.scan_tag_handle('directive', start_mark)
|
|
ch = self.reader.peek()
|
|
if ch != ' ':
|
|
raise ScannerError(
|
|
'while scanning a directive',
|
|
start_mark,
|
|
"expected ' ', but found %r" % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
return value
|
|
|
|
def scan_tag_directive_prefix(self, start_mark):
|
|
# type: (Any) -> Any
|
|
# See the specification for details.
|
|
value = self.scan_tag_uri('directive', start_mark)
|
|
ch = self.reader.peek()
|
|
if ch not in '\0 \r\n\x85\u2028\u2029':
|
|
raise ScannerError(
|
|
'while scanning a directive',
|
|
start_mark,
|
|
"expected ' ', but found %r" % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
return value
|
|
|
|
def scan_directive_ignored_line(self, start_mark):
|
|
# type: (Any) -> None
|
|
# See the specification for details.
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
while srp() == ' ':
|
|
srf()
|
|
if srp() == '#':
|
|
while srp() not in _THE_END:
|
|
srf()
|
|
ch = srp()
|
|
if ch not in _THE_END:
|
|
raise ScannerError(
|
|
'while scanning a directive',
|
|
start_mark,
|
|
'expected a comment or a line break, but found %r' % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
self.scan_line_break()
|
|
|
|
def scan_anchor(self, TokenClass):
|
|
# type: (Any) -> Any
|
|
# The specification does not restrict characters for anchors and
|
|
# aliases. This may lead to problems, for instance, the document:
|
|
# [ *alias, value ]
|
|
# can be interpteted in two ways, as
|
|
# [ "value" ]
|
|
# and
|
|
# [ *alias , "value" ]
|
|
# Therefore we restrict aliases to numbers and ASCII letters.
|
|
srp = self.reader.peek
|
|
start_mark = self.reader.get_mark()
|
|
indicator = srp()
|
|
if indicator == '*':
|
|
name = 'alias'
|
|
else:
|
|
name = 'anchor'
|
|
self.reader.forward()
|
|
length = 0
|
|
ch = srp(length)
|
|
# while u'0' <= ch <= u'9' or u'A' <= ch <= u'Z' or u'a' <= ch <= u'z' \
|
|
# or ch in u'-_':
|
|
while check_anchorname_char(ch):
|
|
length += 1
|
|
ch = srp(length)
|
|
if not length:
|
|
raise ScannerError(
|
|
'while scanning an %s' % (name,),
|
|
start_mark,
|
|
'expected alphabetic or numeric character, but found %r' % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
value = self.reader.prefix(length)
|
|
self.reader.forward(length)
|
|
# ch1 = ch
|
|
# ch = srp() # no need to peek, ch is already set
|
|
# assert ch1 == ch
|
|
if ch not in '\0 \t\r\n\x85\u2028\u2029?:,[]{}%@`':
|
|
raise ScannerError(
|
|
'while scanning an %s' % (name,),
|
|
start_mark,
|
|
'expected alphabetic or numeric character, but found %r' % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
end_mark = self.reader.get_mark()
|
|
return TokenClass(value, start_mark, end_mark)
|
|
|
|
def scan_tag(self):
|
|
# type: () -> Any
|
|
# See the specification for details.
|
|
srp = self.reader.peek
|
|
start_mark = self.reader.get_mark()
|
|
ch = srp(1)
|
|
if ch == '<':
|
|
handle = None
|
|
self.reader.forward(2)
|
|
suffix = self.scan_tag_uri('tag', start_mark)
|
|
if srp() != '>':
|
|
raise ScannerError(
|
|
'while parsing a tag',
|
|
start_mark,
|
|
"expected '>', but found %r" % utf8(srp()),
|
|
self.reader.get_mark(),
|
|
)
|
|
self.reader.forward()
|
|
elif ch in _THE_END_SPACE_TAB:
|
|
handle = None
|
|
suffix = '!'
|
|
self.reader.forward()
|
|
else:
|
|
length = 1
|
|
use_handle = False
|
|
while ch not in '\0 \r\n\x85\u2028\u2029':
|
|
if ch == '!':
|
|
use_handle = True
|
|
break
|
|
length += 1
|
|
ch = srp(length)
|
|
handle = '!'
|
|
if use_handle:
|
|
handle = self.scan_tag_handle('tag', start_mark)
|
|
else:
|
|
handle = '!'
|
|
self.reader.forward()
|
|
suffix = self.scan_tag_uri('tag', start_mark)
|
|
ch = srp()
|
|
if ch not in '\0 \r\n\x85\u2028\u2029':
|
|
raise ScannerError(
|
|
'while scanning a tag',
|
|
start_mark,
|
|
"expected ' ', but found %r" % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
value = (handle, suffix)
|
|
end_mark = self.reader.get_mark()
|
|
return TagToken(value, start_mark, end_mark)
|
|
|
|
def scan_block_scalar(self, style, rt=False):
|
|
# type: (Any, Optional[bool]) -> Any
|
|
# See the specification for details.
|
|
srp = self.reader.peek
|
|
if style == '>':
|
|
folded = True
|
|
else:
|
|
folded = False
|
|
|
|
chunks = [] # type: List[Any]
|
|
start_mark = self.reader.get_mark()
|
|
|
|
# Scan the header.
|
|
self.reader.forward()
|
|
chomping, increment = self.scan_block_scalar_indicators(start_mark)
|
|
# block scalar comment e.g. : |+ # comment text
|
|
block_scalar_comment = self.scan_block_scalar_ignored_line(start_mark)
|
|
|
|
# Determine the indentation level and go to the first non-empty line.
|
|
min_indent = self.indent + 1
|
|
if increment is None:
|
|
# no increment and top level, min_indent could be 0
|
|
if min_indent < 1 and (
|
|
style not in '|>'
|
|
or (self.scanner_processing_version == (1, 1))
|
|
and getattr(
|
|
self.loader, 'top_level_block_style_scalar_no_indent_error_1_1', False
|
|
)
|
|
):
|
|
min_indent = 1
|
|
breaks, max_indent, end_mark = self.scan_block_scalar_indentation()
|
|
indent = max(min_indent, max_indent)
|
|
else:
|
|
if min_indent < 1:
|
|
min_indent = 1
|
|
indent = min_indent + increment - 1
|
|
breaks, end_mark = self.scan_block_scalar_breaks(indent)
|
|
line_break = ""
|
|
|
|
# Scan the inner part of the block scalar.
|
|
while self.reader.column == indent and srp() != '\0':
|
|
chunks.extend(breaks)
|
|
leading_non_space = srp() not in ' \t'
|
|
length = 0
|
|
while srp(length) not in _THE_END:
|
|
length += 1
|
|
chunks.append(self.reader.prefix(length))
|
|
self.reader.forward(length)
|
|
line_break = self.scan_line_break()
|
|
breaks, end_mark = self.scan_block_scalar_breaks(indent)
|
|
if style in '|>' and min_indent == 0:
|
|
# at the beginning of a line, if in block style see if
|
|
# end of document/start_new_document
|
|
if self.check_document_start() or self.check_document_end():
|
|
break
|
|
if self.reader.column == indent and srp() != '\0':
|
|
|
|
# Unfortunately, folding rules are ambiguous.
|
|
#
|
|
# This is the folding according to the specification:
|
|
|
|
if rt and folded and line_break == '\n':
|
|
chunks.append('\a')
|
|
if folded and line_break == '\n' and leading_non_space and srp() not in ' \t':
|
|
if not breaks:
|
|
chunks.append(' ')
|
|
else:
|
|
chunks.append(line_break)
|
|
|
|
# This is Clark Evans's interpretation (also in the spec
|
|
# examples):
|
|
#
|
|
# if folded and line_break == u'\n':
|
|
# if not breaks:
|
|
# if srp() not in ' \t':
|
|
# chunks.append(u' ')
|
|
# else:
|
|
# chunks.append(line_break)
|
|
# else:
|
|
# chunks.append(line_break)
|
|
else:
|
|
break
|
|
|
|
# Process trailing line breaks. The 'chomping' setting determines
|
|
# whether they are included in the value.
|
|
trailing = [] # type: List[Any]
|
|
if chomping in [None, True]:
|
|
chunks.append(line_break)
|
|
if chomping is True:
|
|
chunks.extend(breaks)
|
|
elif chomping in [None, False]:
|
|
trailing.extend(breaks)
|
|
|
|
# We are done.
|
|
token = ScalarToken("".join(chunks), False, start_mark, end_mark, style)
|
|
if block_scalar_comment is not None:
|
|
token.add_pre_comments([block_scalar_comment])
|
|
if len(trailing) > 0:
|
|
# nprint('trailing 1', trailing) # XXXXX
|
|
# Eat whitespaces and comments until we reach the next token.
|
|
comment = self.scan_to_next_token()
|
|
while comment:
|
|
trailing.append(' ' * comment[1].column + comment[0])
|
|
comment = self.scan_to_next_token()
|
|
|
|
# Keep track of the trailing whitespace and following comments
|
|
# as a comment token, if isn't all included in the actual value.
|
|
comment_end_mark = self.reader.get_mark()
|
|
comment = CommentToken("".join(trailing), end_mark, comment_end_mark)
|
|
token.add_post_comment(comment)
|
|
return token
|
|
|
|
def scan_block_scalar_indicators(self, start_mark):
|
|
# type: (Any) -> Any
|
|
# See the specification for details.
|
|
srp = self.reader.peek
|
|
chomping = None
|
|
increment = None
|
|
ch = srp()
|
|
if ch in '+-':
|
|
if ch == '+':
|
|
chomping = True
|
|
else:
|
|
chomping = False
|
|
self.reader.forward()
|
|
ch = srp()
|
|
if ch in '0123456789':
|
|
increment = int(ch)
|
|
if increment == 0:
|
|
raise ScannerError(
|
|
'while scanning a block scalar',
|
|
start_mark,
|
|
'expected indentation indicator in the range 1-9, ' 'but found 0',
|
|
self.reader.get_mark(),
|
|
)
|
|
self.reader.forward()
|
|
elif ch in '0123456789':
|
|
increment = int(ch)
|
|
if increment == 0:
|
|
raise ScannerError(
|
|
'while scanning a block scalar',
|
|
start_mark,
|
|
'expected indentation indicator in the range 1-9, ' 'but found 0',
|
|
self.reader.get_mark(),
|
|
)
|
|
self.reader.forward()
|
|
ch = srp()
|
|
if ch in '+-':
|
|
if ch == '+':
|
|
chomping = True
|
|
else:
|
|
chomping = False
|
|
self.reader.forward()
|
|
ch = srp()
|
|
if ch not in '\0 \r\n\x85\u2028\u2029':
|
|
raise ScannerError(
|
|
'while scanning a block scalar',
|
|
start_mark,
|
|
'expected chomping or indentation indicators, but found %r' % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
return chomping, increment
|
|
|
|
def scan_block_scalar_ignored_line(self, start_mark):
|
|
# type: (Any) -> Any
|
|
# See the specification for details.
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
prefix = ''
|
|
comment = None
|
|
while srp() == ' ':
|
|
prefix += srp()
|
|
srf()
|
|
if srp() == '#':
|
|
comment = prefix
|
|
while srp() not in _THE_END:
|
|
comment += srp()
|
|
srf()
|
|
ch = srp()
|
|
if ch not in _THE_END:
|
|
raise ScannerError(
|
|
'while scanning a block scalar',
|
|
start_mark,
|
|
'expected a comment or a line break, but found %r' % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
self.scan_line_break()
|
|
return comment
|
|
|
|
def scan_block_scalar_indentation(self):
|
|
# type: () -> Any
|
|
# See the specification for details.
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
chunks = []
|
|
max_indent = 0
|
|
end_mark = self.reader.get_mark()
|
|
while srp() in ' \r\n\x85\u2028\u2029':
|
|
if srp() != ' ':
|
|
chunks.append(self.scan_line_break())
|
|
end_mark = self.reader.get_mark()
|
|
else:
|
|
srf()
|
|
if self.reader.column > max_indent:
|
|
max_indent = self.reader.column
|
|
return chunks, max_indent, end_mark
|
|
|
|
def scan_block_scalar_breaks(self, indent):
|
|
# type: (int) -> Any
|
|
# See the specification for details.
|
|
chunks = []
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
end_mark = self.reader.get_mark()
|
|
while self.reader.column < indent and srp() == ' ':
|
|
srf()
|
|
while srp() in '\r\n\x85\u2028\u2029':
|
|
chunks.append(self.scan_line_break())
|
|
end_mark = self.reader.get_mark()
|
|
while self.reader.column < indent and srp() == ' ':
|
|
srf()
|
|
return chunks, end_mark
|
|
|
|
def scan_flow_scalar(self, style):
|
|
# type: (Any) -> Any
|
|
# See the specification for details.
|
|
# Note that we loose indentation rules for quoted scalars. Quoted
|
|
# scalars don't need to adhere indentation because " and ' clearly
|
|
# mark the beginning and the end of them. Therefore we are less
|
|
# restrictive then the specification requires. We only need to check
|
|
# that document separators are not included in scalars.
|
|
if style == '"':
|
|
double = True
|
|
else:
|
|
double = False
|
|
srp = self.reader.peek
|
|
chunks = [] # type: List[Any]
|
|
start_mark = self.reader.get_mark()
|
|
quote = srp()
|
|
self.reader.forward()
|
|
chunks.extend(self.scan_flow_scalar_non_spaces(double, start_mark))
|
|
while srp() != quote:
|
|
chunks.extend(self.scan_flow_scalar_spaces(double, start_mark))
|
|
chunks.extend(self.scan_flow_scalar_non_spaces(double, start_mark))
|
|
self.reader.forward()
|
|
end_mark = self.reader.get_mark()
|
|
return ScalarToken("".join(chunks), False, start_mark, end_mark, style)
|
|
|
|
ESCAPE_REPLACEMENTS = {
|
|
'0': '\0',
|
|
'a': '\x07',
|
|
'b': '\x08',
|
|
't': '\x09',
|
|
'\t': '\x09',
|
|
'n': '\x0A',
|
|
'v': '\x0B',
|
|
'f': '\x0C',
|
|
'r': '\x0D',
|
|
'e': '\x1B',
|
|
' ': '\x20',
|
|
'"': '"',
|
|
'/': '/', # as per http://www.json.org/
|
|
'\\': '\\',
|
|
'N': '\x85',
|
|
'_': '\xA0',
|
|
'L': '\u2028',
|
|
'P': '\u2029',
|
|
}
|
|
|
|
ESCAPE_CODES = {'x': 2, 'u': 4, 'U': 8}
|
|
|
|
def scan_flow_scalar_non_spaces(self, double, start_mark):
|
|
# type: (Any, Any) -> Any
|
|
# See the specification for details.
|
|
chunks = [] # type: List[Any]
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
while True:
|
|
length = 0
|
|
while srp(length) not in ' \n\'"\\\0\t\r\x85\u2028\u2029':
|
|
length += 1
|
|
if length != 0:
|
|
chunks.append(self.reader.prefix(length))
|
|
srf(length)
|
|
ch = srp()
|
|
if not double and ch == "'" and srp(1) == "'":
|
|
chunks.append("'")
|
|
srf(2)
|
|
elif (double and ch == "'") or (not double and ch in '"\\'):
|
|
chunks.append(ch)
|
|
srf()
|
|
elif double and ch == '\\':
|
|
srf()
|
|
ch = srp()
|
|
if ch in self.ESCAPE_REPLACEMENTS:
|
|
chunks.append(self.ESCAPE_REPLACEMENTS[ch])
|
|
srf()
|
|
elif ch in self.ESCAPE_CODES:
|
|
length = self.ESCAPE_CODES[ch]
|
|
srf()
|
|
for k in range(length):
|
|
if srp(k) not in '0123456789ABCDEFabcdef':
|
|
raise ScannerError(
|
|
'while scanning a double-quoted scalar',
|
|
start_mark,
|
|
'expected escape sequence of %d hexdecimal '
|
|
'numbers, but found %r' % (length, utf8(srp(k))),
|
|
self.reader.get_mark(),
|
|
)
|
|
code = int(self.reader.prefix(length), 16)
|
|
chunks.append(unichr(code))
|
|
srf(length)
|
|
elif ch in '\n\r\x85\u2028\u2029':
|
|
self.scan_line_break()
|
|
chunks.extend(self.scan_flow_scalar_breaks(double, start_mark))
|
|
else:
|
|
raise ScannerError(
|
|
'while scanning a double-quoted scalar',
|
|
start_mark,
|
|
'found unknown escape character %r' % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
else:
|
|
return chunks
|
|
|
|
def scan_flow_scalar_spaces(self, double, start_mark):
|
|
# type: (Any, Any) -> Any
|
|
# See the specification for details.
|
|
srp = self.reader.peek
|
|
chunks = []
|
|
length = 0
|
|
while srp(length) in ' \t':
|
|
length += 1
|
|
whitespaces = self.reader.prefix(length)
|
|
self.reader.forward(length)
|
|
ch = srp()
|
|
if ch == '\0':
|
|
raise ScannerError(
|
|
'while scanning a quoted scalar',
|
|
start_mark,
|
|
'found unexpected end of stream',
|
|
self.reader.get_mark(),
|
|
)
|
|
elif ch in '\r\n\x85\u2028\u2029':
|
|
line_break = self.scan_line_break()
|
|
breaks = self.scan_flow_scalar_breaks(double, start_mark)
|
|
if line_break != '\n':
|
|
chunks.append(line_break)
|
|
elif not breaks:
|
|
chunks.append(' ')
|
|
chunks.extend(breaks)
|
|
else:
|
|
chunks.append(whitespaces)
|
|
return chunks
|
|
|
|
def scan_flow_scalar_breaks(self, double, start_mark):
|
|
# type: (Any, Any) -> Any
|
|
# See the specification for details.
|
|
chunks = [] # type: List[Any]
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
while True:
|
|
# Instead of checking indentation, we check for document
|
|
# separators.
|
|
prefix = self.reader.prefix(3)
|
|
if (prefix == '---' or prefix == '...') and srp(3) in _THE_END_SPACE_TAB:
|
|
raise ScannerError(
|
|
'while scanning a quoted scalar',
|
|
start_mark,
|
|
'found unexpected document separator',
|
|
self.reader.get_mark(),
|
|
)
|
|
while srp() in ' \t':
|
|
srf()
|
|
if srp() in '\r\n\x85\u2028\u2029':
|
|
chunks.append(self.scan_line_break())
|
|
else:
|
|
return chunks
|
|
|
|
def scan_plain(self):
|
|
# type: () -> Any
|
|
# See the specification for details.
|
|
# We add an additional restriction for the flow context:
|
|
# plain scalars in the flow context cannot contain ',', ': ' and '?'.
|
|
# We also keep track of the `allow_simple_key` flag here.
|
|
# Indentation rules are loosed for the flow context.
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
chunks = [] # type: List[Any]
|
|
start_mark = self.reader.get_mark()
|
|
end_mark = start_mark
|
|
indent = self.indent + 1
|
|
# We allow zero indentation for scalars, but then we need to check for
|
|
# document separators at the beginning of the line.
|
|
# if indent == 0:
|
|
# indent = 1
|
|
spaces = [] # type: List[Any]
|
|
while True:
|
|
length = 0
|
|
if srp() == '#':
|
|
break
|
|
while True:
|
|
ch = srp(length)
|
|
if ch == ':' and srp(length + 1) not in _THE_END_SPACE_TAB:
|
|
pass
|
|
elif ch == '?' and self.scanner_processing_version != (1, 1):
|
|
pass
|
|
elif (
|
|
ch in _THE_END_SPACE_TAB
|
|
or (
|
|
not self.flow_level
|
|
and ch == ':'
|
|
and srp(length + 1) in _THE_END_SPACE_TAB
|
|
)
|
|
or (self.flow_level and ch in ',:?[]{}')
|
|
):
|
|
break
|
|
length += 1
|
|
# It's not clear what we should do with ':' in the flow context.
|
|
if (
|
|
self.flow_level
|
|
and ch == ':'
|
|
and srp(length + 1) not in '\0 \t\r\n\x85\u2028\u2029,[]{}'
|
|
):
|
|
srf(length)
|
|
raise ScannerError(
|
|
'while scanning a plain scalar',
|
|
start_mark,
|
|
"found unexpected ':'",
|
|
self.reader.get_mark(),
|
|
'Please check '
|
|
'http://pyyaml.org/wiki/YAMLColonInFlowContext '
|
|
'for details.',
|
|
)
|
|
if length == 0:
|
|
break
|
|
self.allow_simple_key = False
|
|
chunks.extend(spaces)
|
|
chunks.append(self.reader.prefix(length))
|
|
srf(length)
|
|
end_mark = self.reader.get_mark()
|
|
spaces = self.scan_plain_spaces(indent, start_mark)
|
|
if (
|
|
not spaces
|
|
or srp() == '#'
|
|
or (not self.flow_level and self.reader.column < indent)
|
|
):
|
|
break
|
|
|
|
token = ScalarToken("".join(chunks), True, start_mark, end_mark)
|
|
if spaces and spaces[0] == '\n':
|
|
# Create a comment token to preserve the trailing line breaks.
|
|
comment = CommentToken("".join(spaces) + '\n', start_mark, end_mark)
|
|
token.add_post_comment(comment)
|
|
return token
|
|
|
|
def scan_plain_spaces(self, indent, start_mark):
|
|
# type: (Any, Any) -> Any
|
|
# See the specification for details.
|
|
# The specification is really confusing about tabs in plain scalars.
|
|
# We just forbid them completely. Do not use tabs in YAML!
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
chunks = []
|
|
length = 0
|
|
while srp(length) in ' ':
|
|
length += 1
|
|
whitespaces = self.reader.prefix(length)
|
|
self.reader.forward(length)
|
|
ch = srp()
|
|
if ch in '\r\n\x85\u2028\u2029':
|
|
line_break = self.scan_line_break()
|
|
self.allow_simple_key = True
|
|
prefix = self.reader.prefix(3)
|
|
if (prefix == '---' or prefix == '...') and srp(3) in _THE_END_SPACE_TAB:
|
|
return
|
|
breaks = []
|
|
while srp() in ' \r\n\x85\u2028\u2029':
|
|
if srp() == ' ':
|
|
srf()
|
|
else:
|
|
breaks.append(self.scan_line_break())
|
|
prefix = self.reader.prefix(3)
|
|
if (prefix == '---' or prefix == '...') and srp(3) in _THE_END_SPACE_TAB:
|
|
return
|
|
if line_break != '\n':
|
|
chunks.append(line_break)
|
|
elif not breaks:
|
|
chunks.append(' ')
|
|
chunks.extend(breaks)
|
|
elif whitespaces:
|
|
chunks.append(whitespaces)
|
|
return chunks
|
|
|
|
def scan_tag_handle(self, name, start_mark):
|
|
# type: (Any, Any) -> Any
|
|
# See the specification for details.
|
|
# For some strange reasons, the specification does not allow '_' in
|
|
# tag handles. I have allowed it anyway.
|
|
srp = self.reader.peek
|
|
ch = srp()
|
|
if ch != '!':
|
|
raise ScannerError(
|
|
'while scanning a %s' % (name,),
|
|
start_mark,
|
|
"expected '!', but found %r" % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
length = 1
|
|
ch = srp(length)
|
|
if ch != ' ':
|
|
while '0' <= ch <= '9' or 'A' <= ch <= 'Z' or 'a' <= ch <= 'z' or ch in '-_':
|
|
length += 1
|
|
ch = srp(length)
|
|
if ch != '!':
|
|
self.reader.forward(length)
|
|
raise ScannerError(
|
|
'while scanning a %s' % (name,),
|
|
start_mark,
|
|
"expected '!', but found %r" % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
length += 1
|
|
value = self.reader.prefix(length)
|
|
self.reader.forward(length)
|
|
return value
|
|
|
|
def scan_tag_uri(self, name, start_mark):
|
|
# type: (Any, Any) -> Any
|
|
# See the specification for details.
|
|
# Note: we do not check if URI is well-formed.
|
|
srp = self.reader.peek
|
|
chunks = []
|
|
length = 0
|
|
ch = srp(length)
|
|
while (
|
|
'0' <= ch <= '9'
|
|
or 'A' <= ch <= 'Z'
|
|
or 'a' <= ch <= 'z'
|
|
or ch in "-;/?:@&=+$,_.!~*'()[]%"
|
|
or ((self.scanner_processing_version > (1, 1)) and ch == '#')
|
|
):
|
|
if ch == '%':
|
|
chunks.append(self.reader.prefix(length))
|
|
self.reader.forward(length)
|
|
length = 0
|
|
chunks.append(self.scan_uri_escapes(name, start_mark))
|
|
else:
|
|
length += 1
|
|
ch = srp(length)
|
|
if length != 0:
|
|
chunks.append(self.reader.prefix(length))
|
|
self.reader.forward(length)
|
|
length = 0
|
|
if not chunks:
|
|
raise ScannerError(
|
|
'while parsing a %s' % (name,),
|
|
start_mark,
|
|
'expected URI, but found %r' % utf8(ch),
|
|
self.reader.get_mark(),
|
|
)
|
|
return "".join(chunks)
|
|
|
|
def scan_uri_escapes(self, name, start_mark):
|
|
# type: (Any, Any) -> Any
|
|
# See the specification for details.
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
code_bytes = [] # type: List[Any]
|
|
mark = self.reader.get_mark()
|
|
while srp() == '%':
|
|
srf()
|
|
for k in range(2):
|
|
if srp(k) not in '0123456789ABCDEFabcdef':
|
|
raise ScannerError(
|
|
'while scanning a %s' % (name,),
|
|
start_mark,
|
|
'expected URI escape sequence of 2 hexdecimal numbers,'
|
|
' but found %r' % utf8(srp(k)),
|
|
self.reader.get_mark(),
|
|
)
|
|
if PY3:
|
|
code_bytes.append(int(self.reader.prefix(2), 16))
|
|
else:
|
|
code_bytes.append(chr(int(self.reader.prefix(2), 16)))
|
|
srf(2)
|
|
try:
|
|
if PY3:
|
|
value = bytes(code_bytes).decode('utf-8')
|
|
else:
|
|
value = unicode(b"".join(code_bytes), 'utf-8')
|
|
except UnicodeDecodeError as exc:
|
|
raise ScannerError('while scanning a %s' % (name,), start_mark, str(exc), mark)
|
|
return value
|
|
|
|
def scan_line_break(self):
|
|
# type: () -> Any
|
|
# Transforms:
|
|
# '\r\n' : '\n'
|
|
# '\r' : '\n'
|
|
# '\n' : '\n'
|
|
# '\x85' : '\n'
|
|
# '\u2028' : '\u2028'
|
|
# '\u2029 : '\u2029'
|
|
# default : ''
|
|
ch = self.reader.peek()
|
|
if ch in '\r\n\x85':
|
|
if self.reader.prefix(2) == '\r\n':
|
|
self.reader.forward(2)
|
|
else:
|
|
self.reader.forward()
|
|
return '\n'
|
|
elif ch in '\u2028\u2029':
|
|
self.reader.forward()
|
|
return ch
|
|
return ""
|
|
|
|
|
|
class RoundTripScanner(Scanner):
|
|
def check_token(self, *choices):
|
|
# type: (Any) -> bool
|
|
# Check if the next token is one of the given types.
|
|
while self.need_more_tokens():
|
|
self.fetch_more_tokens()
|
|
self._gather_comments()
|
|
if bool(self.tokens):
|
|
if not choices:
|
|
return True
|
|
for choice in choices:
|
|
if isinstance(self.tokens[0], choice):
|
|
return True
|
|
return False
|
|
|
|
def peek_token(self):
|
|
# type: () -> Any
|
|
# Return the next token, but do not delete if from the queue.
|
|
while self.need_more_tokens():
|
|
self.fetch_more_tokens()
|
|
self._gather_comments()
|
|
if bool(self.tokens):
|
|
return self.tokens[0]
|
|
return None
|
|
|
|
def _gather_comments(self):
|
|
# type: () -> Any
|
|
"""combine multiple comment lines"""
|
|
comments = [] # type: List[Any]
|
|
if not self.tokens:
|
|
return comments
|
|
if isinstance(self.tokens[0], CommentToken):
|
|
comment = self.tokens.pop(0)
|
|
self.tokens_taken += 1
|
|
comments.append(comment)
|
|
while self.need_more_tokens():
|
|
self.fetch_more_tokens()
|
|
if not self.tokens:
|
|
return comments
|
|
if isinstance(self.tokens[0], CommentToken):
|
|
self.tokens_taken += 1
|
|
comment = self.tokens.pop(0)
|
|
# nprint('dropping2', comment)
|
|
comments.append(comment)
|
|
if len(comments) >= 1:
|
|
self.tokens[0].add_pre_comments(comments)
|
|
# pull in post comment on e.g. ':'
|
|
if not self.done and len(self.tokens) < 2:
|
|
self.fetch_more_tokens()
|
|
|
|
def get_token(self):
|
|
# type: () -> Any
|
|
# Return the next token.
|
|
while self.need_more_tokens():
|
|
self.fetch_more_tokens()
|
|
self._gather_comments()
|
|
if bool(self.tokens):
|
|
# nprint('tk', self.tokens)
|
|
# only add post comment to single line tokens:
|
|
# scalar, value token. FlowXEndToken, otherwise
|
|
# hidden streamtokens could get them (leave them and they will be
|
|
# pre comments for the next map/seq
|
|
if (
|
|
len(self.tokens) > 1
|
|
and isinstance(
|
|
self.tokens[0],
|
|
(ScalarToken, ValueToken, FlowSequenceEndToken, FlowMappingEndToken),
|
|
)
|
|
and isinstance(self.tokens[1], CommentToken)
|
|
and self.tokens[0].end_mark.line == self.tokens[1].start_mark.line
|
|
):
|
|
self.tokens_taken += 1
|
|
c = self.tokens.pop(1)
|
|
self.fetch_more_tokens()
|
|
while len(self.tokens) > 1 and isinstance(self.tokens[1], CommentToken):
|
|
self.tokens_taken += 1
|
|
c1 = self.tokens.pop(1)
|
|
c.value = c.value + (' ' * c1.start_mark.column) + c1.value
|
|
self.fetch_more_tokens()
|
|
self.tokens[0].add_post_comment(c)
|
|
elif (
|
|
len(self.tokens) > 1
|
|
and isinstance(self.tokens[0], ScalarToken)
|
|
and isinstance(self.tokens[1], CommentToken)
|
|
and self.tokens[0].end_mark.line != self.tokens[1].start_mark.line
|
|
):
|
|
self.tokens_taken += 1
|
|
c = self.tokens.pop(1)
|
|
c.value = (
|
|
'\n' * (c.start_mark.line - self.tokens[0].end_mark.line)
|
|
+ (' ' * c.start_mark.column)
|
|
+ c.value
|
|
)
|
|
self.tokens[0].add_post_comment(c)
|
|
self.fetch_more_tokens()
|
|
while len(self.tokens) > 1 and isinstance(self.tokens[1], CommentToken):
|
|
self.tokens_taken += 1
|
|
c1 = self.tokens.pop(1)
|
|
c.value = c.value + (' ' * c1.start_mark.column) + c1.value
|
|
self.fetch_more_tokens()
|
|
self.tokens_taken += 1
|
|
return self.tokens.pop(0)
|
|
return None
|
|
|
|
def fetch_comment(self, comment):
|
|
# type: (Any) -> None
|
|
value, start_mark, end_mark = comment
|
|
while value and value[-1] == ' ':
|
|
# empty line within indented key context
|
|
# no need to update end-mark, that is not used
|
|
value = value[:-1]
|
|
self.tokens.append(CommentToken(value, start_mark, end_mark))
|
|
|
|
# scanner
|
|
|
|
def scan_to_next_token(self):
|
|
# type: () -> Any
|
|
# We ignore spaces, line breaks and comments.
|
|
# If we find a line break in the block context, we set the flag
|
|
# `allow_simple_key` on.
|
|
# The byte order mark is stripped if it's the first character in the
|
|
# stream. We do not yet support BOM inside the stream as the
|
|
# specification requires. Any such mark will be considered as a part
|
|
# of the document.
|
|
#
|
|
# TODO: We need to make tab handling rules more sane. A good rule is
|
|
# Tabs cannot precede tokens
|
|
# BLOCK-SEQUENCE-START, BLOCK-MAPPING-START, BLOCK-END,
|
|
# KEY(block), VALUE(block), BLOCK-ENTRY
|
|
# So the checking code is
|
|
# if <TAB>:
|
|
# self.allow_simple_keys = False
|
|
# We also need to add the check for `allow_simple_keys == True` to
|
|
# `unwind_indent` before issuing BLOCK-END.
|
|
# Scanners for block, flow, and plain scalars need to be modified.
|
|
|
|
srp = self.reader.peek
|
|
srf = self.reader.forward
|
|
if self.reader.index == 0 and srp() == '\uFEFF':
|
|
srf()
|
|
found = False
|
|
while not found:
|
|
while srp() == ' ':
|
|
srf()
|
|
ch = srp()
|
|
if ch == '#':
|
|
start_mark = self.reader.get_mark()
|
|
comment = ch
|
|
srf()
|
|
while ch not in _THE_END:
|
|
ch = srp()
|
|
if ch == '\0': # don't gobble the end-of-stream character
|
|
# but add an explicit newline as "YAML processors should terminate
|
|
# the stream with an explicit line break
|
|
# https://yaml.org/spec/1.2/spec.html#id2780069
|
|
comment += '\n'
|
|
break
|
|
comment += ch
|
|
srf()
|
|
# gather any blank lines following the comment too
|
|
ch = self.scan_line_break()
|
|
while len(ch) > 0:
|
|
comment += ch
|
|
ch = self.scan_line_break()
|
|
end_mark = self.reader.get_mark()
|
|
if not self.flow_level:
|
|
self.allow_simple_key = True
|
|
return comment, start_mark, end_mark
|
|
if bool(self.scan_line_break()):
|
|
start_mark = self.reader.get_mark()
|
|
if not self.flow_level:
|
|
self.allow_simple_key = True
|
|
ch = srp()
|
|
if ch == '\n': # empty toplevel lines
|
|
start_mark = self.reader.get_mark()
|
|
comment = ""
|
|
while ch:
|
|
ch = self.scan_line_break(empty_line=True)
|
|
comment += ch
|
|
if srp() == '#':
|
|
# empty line followed by indented real comment
|
|
comment = comment.rsplit('\n', 1)[0] + '\n'
|
|
end_mark = self.reader.get_mark()
|
|
return comment, start_mark, end_mark
|
|
else:
|
|
found = True
|
|
return None
|
|
|
|
def scan_line_break(self, empty_line=False):
|
|
# type: (bool) -> Text
|
|
# Transforms:
|
|
# '\r\n' : '\n'
|
|
# '\r' : '\n'
|
|
# '\n' : '\n'
|
|
# '\x85' : '\n'
|
|
# '\u2028' : '\u2028'
|
|
# '\u2029 : '\u2029'
|
|
# default : ''
|
|
ch = self.reader.peek() # type: Text
|
|
if ch in '\r\n\x85':
|
|
if self.reader.prefix(2) == '\r\n':
|
|
self.reader.forward(2)
|
|
else:
|
|
self.reader.forward()
|
|
return '\n'
|
|
elif ch in '\u2028\u2029':
|
|
self.reader.forward()
|
|
return ch
|
|
elif empty_line and ch in '\t ':
|
|
self.reader.forward()
|
|
return ch
|
|
return ""
|
|
|
|
def scan_block_scalar(self, style, rt=True):
|
|
# type: (Any, Optional[bool]) -> Any
|
|
return Scanner.scan_block_scalar(self, style, rt=rt)
|
|
|
|
|
|
# try:
|
|
# import psyco
|
|
# psyco.bind(Scanner)
|
|
# except ImportError:
|
|
# pass
|