56 lines
1.9 KiB
TypeScript
56 lines
1.9 KiB
TypeScript
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import type { IBufferLine } from '@xterm/xterm';
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export interface PluginTerminalBufferText {
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readonly text: string;
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/** Maps UTF-16 string boundaries to zero-based xterm cell boundaries. */
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readonly cellAtStringOffset: readonly number[];
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}
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function identityMapping(text: string): PluginTerminalBufferText {
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return Object.freeze({
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text,
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cellAtStringOffset: Object.freeze(Array.from({ length: text.length + 1 }, (_, index) => index)),
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});
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}
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export function readPluginTerminalBufferText(
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line: IBufferLine,
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trimRight: boolean,
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): PluginTerminalBufferText {
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if (typeof line.getCell !== 'function' || !Number.isInteger(line.length) || line.length < 0) {
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return identityMapping(line.translateToString(trimRight));
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}
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let text = '';
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const cellAtStringOffset: number[] = [0];
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for (let cellIndex = 0; cellIndex < line.length; cellIndex += 1) {
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const cell = line.getCell(cellIndex);
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if (!cell) continue;
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const width = cell.getWidth();
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if (width === 0) continue;
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const characters = cell.getChars() || ' ';
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const startOffset = text.length;
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text += characters;
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for (let offset = startOffset; offset < text.length; offset += 1) {
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cellAtStringOffset[offset] = cellIndex;
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}
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cellAtStringOffset[text.length] = cellIndex + Math.max(1, width);
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}
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if (trimRight) {
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const trimmed = text.trimEnd();
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cellAtStringOffset.length = trimmed.length + 1;
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text = trimmed;
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}
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return Object.freeze({ text, cellAtStringOffset: Object.freeze(cellAtStringOffset) });
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}
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export function pluginTerminalCellRange(
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line: PluginTerminalBufferText,
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start: number,
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length: number,
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): { x: number; width: number } | null {
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const startCell = line.cellAtStringOffset[start];
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const endCell = line.cellAtStringOffset[start + length];
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if (!Number.isInteger(startCell) || !Number.isInteger(endCell) || endCell <= startCell) return null;
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return { x: startCell, width: endCell - startCell };
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}
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