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"""API for working with a Nvim Buffer.""" |
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from .common import Remote |
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from ..compat import IS_PYTHON3 |
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__all__ = ('Buffer') |
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if IS_PYTHON3: |
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basestring = str |
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def adjust_index(idx, default=None): |
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"""Convert from python indexing convention to nvim indexing convention.""" |
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if idx is None: |
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return default |
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elif idx < 0: |
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return idx - 1 |
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else: |
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return idx |
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class Buffer(Remote): |
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"""A remote Nvim buffer.""" |
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_api_prefix = "buffer_" |
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def __len__(self): |
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"""Return the number of lines contained in a Buffer.""" |
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return self.request('buffer_line_count') |
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def __getitem__(self, idx): |
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"""Get a buffer line or slice by integer index. |
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Indexes may be negative to specify positions from the end of the |
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buffer. For example, -1 is the last line, -2 is the line before that |
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and so on. |
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When retrieving slices, omiting indexes(eg: `buffer[:]`) will bring |
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the whole buffer. |
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""" |
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if not isinstance(idx, slice): |
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i = adjust_index(idx) |
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return self.request('buffer_get_lines', i, i + 1, True)[0] |
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start = adjust_index(idx.start, 0) |
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end = adjust_index(idx.stop, -1) |
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return self.request('buffer_get_lines', start, end, False) |
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def __setitem__(self, idx, item): |
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"""Replace a buffer line or slice by integer index. |
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Like with `__getitem__`, indexes may be negative. |
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When replacing slices, omiting indexes(eg: `buffer[:]`) will replace |
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the whole buffer. |
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""" |
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if not isinstance(idx, slice): |
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i = adjust_index(idx) |
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lines = [item] if item is not None else [] |
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return self.request('buffer_set_lines', i, i + 1, True, lines) |
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lines = item if item is not None else [] |
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start = adjust_index(idx.start, 0) |
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end = adjust_index(idx.stop, -1) |
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return self.request('buffer_set_lines', start, end, False, lines) |
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def __iter__(self): |
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"""Iterate lines of a buffer. |
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This will retrieve all lines locally before iteration starts. This |
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approach is used because for most cases, the gain is much greater by |
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minimizing the number of API calls by transfering all data needed to |
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work. |
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""" |
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lines = self[:] |
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for line in lines: |
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yield line |
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def __delitem__(self, idx): |
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"""Delete line or slice of lines from the buffer. |
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This is the same as __setitem__(idx, []) |
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""" |
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self.__setitem__(idx, None) |
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def append(self, lines, index=-1): |
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"""Append a string or list of lines to the buffer.""" |
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if isinstance(lines, (basestring, bytes)): |
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lines = [lines] |
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return self.request('buffer_set_lines', index, index, True, lines) |
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def mark(self, name): |
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"""Return (row, col) tuple for a named mark.""" |
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return self.request('buffer_get_mark', name) |
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def range(self, start, end): |
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"""Return a `Range` object, which represents part of the Buffer.""" |
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return Range(self, start, end) |
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def add_highlight(self, hl_group, line, col_start=0, |
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col_end=-1, src_id=-1, async=None): |
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"""Add a highlight to the buffer.""" |
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if async is None: |
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async = (src_id != 0) |
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return self.request('buffer_add_highlight', src_id, hl_group, |
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line, col_start, col_end, async=async) |
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def clear_highlight(self, src_id, line_start=0, line_end=-1, async=True): |
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"""Clear highlights from the buffer.""" |
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self.request('buffer_clear_highlight', src_id, |
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line_start, line_end, async=async) |
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@property |
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def name(self): |
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"""Get the buffer name.""" |
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return self.request('buffer_get_name') |
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@name.setter |
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def name(self, value): |
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"""Set the buffer name. BufFilePre/BufFilePost are triggered.""" |
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return self.request('buffer_set_name', value) |
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@property |
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def valid(self): |
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"""Return True if the buffer still exists.""" |
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return self.request('buffer_is_valid') |
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@property |
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def number(self): |
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"""Get the buffer number.""" |
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return self.request('buffer_get_number') |
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class Range(object): |
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def __init__(self, buffer, start, end): |
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self._buffer = buffer |
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self.start = start - 1 |
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self.end = end - 1 |
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def __len__(self): |
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return self.end - self.start + 1 |
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def __getitem__(self, idx): |
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if not isinstance(idx, slice): |
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return self._buffer[self._normalize_index(idx)] |
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start = self._normalize_index(idx.start) |
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end = self._normalize_index(idx.stop) |
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if start is None: |
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start = self.start |
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if end is None: |
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end = self.end + 1 |
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return self._buffer[start:end] |
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def __setitem__(self, idx, lines): |
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if not isinstance(idx, slice): |
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self._buffer[self._normalize_index(idx)] = lines |
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return |
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start = self._normalize_index(idx.start) |
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end = self._normalize_index(idx.stop) |
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if start is None: |
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start = self.start |
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if end is None: |
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end = self.end + 1 |
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self._buffer[start:end] = lines |
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def __iter__(self): |
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for i in range(self.start, self.end + 1): |
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yield self._buffer[i] |
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def append(self, lines, i=None): |
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i = self._normalize_index(i) |
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if i is None: |
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i = self.end + 1 |
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self._buffer.append(lines, i) |
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def _normalize_index(self, index): |
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if index is None: |
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return None |
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if index < 0: |
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index = self.end |
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else: |
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index += self.start |
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if index > self.end: |
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index = self.end |
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return index |
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neovim /
python-client
