66 lines
2.3 KiB
TypeScript
66 lines
2.3 KiB
TypeScript
 
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/**
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* Joins an xterm buffer row with its wrapped continuations.
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*
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* `WebLinksAddon` does the same in its private `LinkComputer`, which the
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* built package does not export — so the walk is repeated here, with the same
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* 2048-character budget. Rows are read with `translateToString(true)`, which
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* trims the right edge; a wrap never ends in trailing spaces xterm would keep,
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* so the join is exact for the text a path can occur in.
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*
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* Wide characters (CJK, emoji) occupy two cells but one string index, so a
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* column computed from a string offset drifts right of the glyph on such rows.
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* The addon corrects this with `getCell`; v1 accepts the drift (underline
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* lands a cell early; the click still resolves the same link).
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*/
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export const MAX_JOINED_LENGTH = 2048;
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/** Minimal slice of xterm's IBuffer this needs. */
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export interface RowSource {
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getLine(y: number): { isWrapped: boolean; translateToString(trimRight?: boolean): string } | undefined;
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}
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export interface JoinedLine {
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text: string;
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/** 0-based index of the first buffer row that contributed. */
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firstRow: number;
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/** For each contributed row (in order), the string offset at which it starts. */
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rowStarts: number[];
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}
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export function joinWrappedRows(buffer: RowSource, row: number): JoinedLine {
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let top = row;
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while (top > 0 && buffer.getLine(top)?.isWrapped) top--;
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const parts: string[] = [];
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let length = 0;
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let y = top;
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for (;;) {
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const line = buffer.getLine(y);
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if (!line) break;
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if (y !== top && !line.isWrapped) break;
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const text = line.translateToString(true);
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if (length + text.length > MAX_JOINED_LENGTH && parts.length > 0) break;
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parts.push(text);
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length += text.length;
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y++;
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}
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const rowStarts: number[] = [];
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let offset = 0;
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for (const p of parts) {
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rowStarts.push(offset);
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offset += p.length;
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}
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return { text: parts.join(""), firstRow: top, rowStarts };
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}
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/** String offset → 1-based {x, y} cell (y is the buffer row + 1). */
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export function offsetToCell(joined: JoinedLine, offset: number): { x: number; y: number } {
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let rowIdx = 0;
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for (let i = 0; i < joined.rowStarts.length; i++) {
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if (joined.rowStarts[i] <= offset) rowIdx = i;
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}
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return { x: offset - joined.rowStarts[rowIdx] + 1, y: joined.firstRow + rowIdx + 1 };
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}
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