94 lines
2.8 KiB
Python
94 lines
2.8 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import sys
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import yaml
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if sys.version_info >= (3, 8):
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from functools import cached_property
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else:
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from .cached_property import cached_property
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LINE_SEPARATORS = "\0\r\n\x85\u2028\u2029"
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WHITESPACE_CHARS = " \t"
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class Pos:
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@classmethod
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def from_node(cls, node, line_ofs=0, column_ofs=0):
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mark = node.start_mark
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return cls(mark, mark.name, mark.line + line_ofs, mark.column + column_ofs)
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@classmethod
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def from_file(cls, path, text):
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mark = yaml.Mark(str(path), 0, 0, 0, text, 0)
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return cls(mark, path, 0, 0)
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def __init__(self, mark, path, line, column):
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self._mark = mark
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self.path = path
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self.line = line # Starts from 0.
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self.column = column # Starts from 0.
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def __repr__(self):
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return f"<Pos {self.path}:{self.line}:{self.column}>"
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def with_offset(self, line_ofs=0, column_ofs=0):
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line_ptr = self._move_ptr_by_lines(line_ofs)
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ptr = line_ptr + column_ofs
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mark = self._clone_mark(self._mark, ptr)
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if line_ofs:
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column = column_ofs # Start from new line.
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else:
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column = self.column + column_ofs
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return Pos(mark, self.path, self.line + line_ofs, column)
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def with_contents_start(self):
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ptr = self._mark.pointer
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buf = self._mark.buffer
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while (
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ptr < len(buf)
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and buf[ptr] not in LINE_SEPARATORS
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and buf[ptr] in WHITESPACE_CHARS
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):
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ptr += 1
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mark = self._clone_mark(self._mark, ptr)
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return Pos(mark, self.path, self.line, self.column + ptr - self._mark.pointer)
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@cached_property
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def snippet(self):
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return self._mark.get_snippet(max_length=100)
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@cached_property
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def body(self):
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return self._mark.buffer[self._mark.pointer :]
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def _clone_mark(self, mark, ptr):
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return yaml.Mark(
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mark.name,
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mark.index,
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mark.line,
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mark.column,
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mark.buffer,
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ptr,
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)
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def _move_ptr_by_lines(self, line_ofs):
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ptr = self._mark.pointer
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buf = self._mark.buffer
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while line_ofs > 0 and ptr < len(buf):
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if buf[ptr] in LINE_SEPARATORS:
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line_ofs -= 1
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ptr += 1
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return ptr
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