115 lines
3.1 KiB
Python
115 lines
3.1 KiB
Python
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from __future__ import annotations
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from typing import NamedTuple
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from textual.geometry import Offset
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class Selection(NamedTuple):
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"""A selected range of lines."""
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start: Offset | None
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"""Offset or None for `start`."""
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end: Offset | None
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"""Offset or None for `end`."""
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@classmethod
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def from_offsets(cls, offset1: Offset, offset2: Offset) -> Selection:
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"""Create selection from 2 offsets.
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Args:
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offset1: First offset.
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offset2: Second offset.
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Returns:
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New Selection.
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"""
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offsets = sorted([offset1, offset2], key=(lambda offset: (offset.y, offset.x)))
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return cls(*offsets)
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def extract(self, text: str) -> str:
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"""Extract selection from text.
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Args:
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text: Raw text pulled from widget.
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Returns:
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Extracted text.
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"""
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lines = text.splitlines()
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if not lines:
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return ""
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if self.start is None:
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start_line = 0
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start_offset = 0
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else:
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start_line, start_offset = self.start.transpose
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if self.end is None:
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end_line = len(lines)
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end_offset = len(lines[-1])
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else:
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end_line, end_offset = self.end.transpose
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end_line = min(len(lines), end_line)
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if start_line == end_line:
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return lines[start_line][start_offset:end_offset]
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selection: list[str] = []
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selected_lines = lines[start_line : end_line + 1]
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if len(selected_lines) >= 2:
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first_line, *mid_lines, last_line = selected_lines
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selection.append(first_line[start_offset:])
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selection.extend(mid_lines)
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selection.append(last_line[:end_offset])
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else:
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return lines[start_line][start_offset:end_offset]
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return "\n".join(selection)
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def get_span(self, y: int) -> tuple[int, int] | None:
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"""Get the selected span in a given line.
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Args:
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y: Offset of the line.
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Returns:
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A tuple of x start and end offset, or None for no selection.
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"""
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start, end = self
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if start is None and end is None:
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# Selection covers everything
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return 0, -1
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if start is not None and end is not None:
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if y < start.y or y > end.y:
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# Outside
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return None
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if y == start.y and start.y == end.y:
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# Same line
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return start.x, end.x
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if y == end.y:
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# Last line
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return 0, end.x
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if y == start.y:
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return start.x, -1
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# Remaining lines
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return 0, -1
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if start is None and end is not None:
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if y == end.y:
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return 0, end.x
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if y > end.y:
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return None
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return 0, -1
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if end is None and start is not None:
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if y == start.y:
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return start.x, -1
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if y > start.y:
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return 0, -1
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return None
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return 0, -1
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SELECT_ALL = Selection(None, None)
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