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TypeScript
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859import wrapAnsi from "wrap-ansi"import { renderMarkdownAnsi } from "./markdown.js"import { RowIndex, joinRows, type Rows } from "./row-index.js"
type Layout = { rows: RowIndex; fragments: number; revision: number; tail: string[] }const render = (text: string, width: number): string[] => wrapAnsi(renderMarkdownAnsi(text, width), width, { hard: true, trim: false }).split("\n")
/** Completed lines/closed fences never change; only the unfinished suffix is reparsed. * Keep a fence together: syntax highlighting can span its lines. Raw ANSI similarly * falls back to a single fragment so styles crossing newlines are preserved. */export class MarkdownIndex { private readonly fragments: string[] = [] private readonly layouts = new Map<number, Layout>() private readonly fence: string[] = [] private line = "" private revision = 0 private opaque = false
append(chunk: string): void { this.revision++ this.opaque ||= /[\x1b\x9b]/.test(chunk) let start = 0 for (let end = chunk.indexOf("\n"); end !== -1; end = chunk.indexOf("\n", start)) { this.line += chunk.slice(start, end + 1) const delimiter = this.line.startsWith("```") if (this.fence.length) { this.fence.push(this.line) if (delimiter) { this.fragments.push(this.fence.join("")); this.fence.length = 0 } } else if (delimiter) this.fence.push(this.line) else this.fragments.push(this.line) this.line = "" start = end + 1 } this.line += chunk.slice(start) }
text(): string { return this.fragments.join("") + this.fence.join("") + this.line }
layout(width: number): Rows { width = Math.max(1, width) const layout = this.layouts.get(width) ?? { rows: new RowIndex(), fragments: 0, revision: -1, tail: [] } this.layouts.delete(width) this.layouts.set(width, layout) if (this.layouts.size > 2) this.layouts.delete(this.layouts.keys().next().value!) if (layout.revision !== this.revision) { if (this.opaque) layout.tail = render(this.text(), width) else { while (layout.fragments < this.fragments.length) { layout.rows.append(render(this.fragments[layout.fragments++]!.slice(0, -1), width)) } layout.tail = render(this.fence.join("") + this.line, width) } layout.revision = this.revision } return this.opaque ? layout.tail : joinRows([layout.rows, layout.tail]) }}