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41 lines
1.2 KiB
TypeScript
41 lines
1.2 KiB
TypeScript
/**
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* @license
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* Copyright 2025 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* Calculates the maximum width of a multi-line ASCII art string.
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* @param asciiArt The ASCII art string.
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* @returns The length of the longest line in the ASCII art.
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*/
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export const getAsciiArtWidth = (asciiArt: string): number => {
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if (!asciiArt) {
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return 0;
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}
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const lines = asciiArt.split('\n');
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return Math.max(...lines.map((line) => line.length));
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};
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/*
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* -------------------------------------------------------------------------
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* Unicode‑aware helpers (work at the code‑point level rather than UTF‑16
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* code units so that surrogate‑pair emoji count as one "column".)
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* ---------------------------------------------------------------------- */
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export function toCodePoints(str: string): string[] {
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// [...str] or Array.from both iterate by UTF‑32 code point, handling
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// surrogate pairs correctly.
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return Array.from(str);
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}
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export function cpLen(str: string): number {
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return toCodePoints(str).length;
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}
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export function cpSlice(str: string, start: number, end?: number): string {
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// Slice by code‑point indices and re‑join.
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const arr = toCodePoints(str).slice(start, end);
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return arr.join('');
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}
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