86 lines
3.2 KiB
TypeScript
86 lines
3.2 KiB
TypeScript
import { isWordCharacter } from './commonmark/emphasis-matching.ts'
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export type Flavour = 'lossless' | 'plain'
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type AlertMarker = { folded: boolean; length: number; panelType: string }
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export const foldedAlertMarker = '[!NOTE]-'
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export const highlightDelimiter = '=='
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const alertWords: Readonly<Record<string, string>> = {
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error: 'CAUTION',
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info: 'NOTE',
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note: 'IMPORTANT',
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success: 'TIP',
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tip: 'TIP',
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warning: 'WARNING',
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}
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// ー, ｰ and the kana voicing marks are Script=Common; Script_Extensions would also take Latin combining marks.
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const boundingScript = /^[\u3099-\u309c\u30fc\uff70\uff9e\uff9f\p{Script=Han}\p{Script=Hangul}\p{Script=Hiragana}\p{Script=Katakana}\p{Script=Khmer}\p{Script=Lao}\p{Script=Myanmar}\p{Script=Thai}]$/u
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const panelTypesByWord: Readonly<Record<string, string>> = {
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attention: 'warning',
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bug: 'error',
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caution: 'error',
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check: 'success',
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danger: 'error',
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done: 'success',
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error: 'error',
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fail: 'error',
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failure: 'error',
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hint: 'tip',
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important: 'note',
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missing: 'error',
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success: 'success',
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tip: 'tip',
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warning: 'warning',
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}
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export function alertMarker(panelType: unknown): string {
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const word = typeof panelType === 'string' && Object.hasOwn(alertWords, panelType) ? alertWords[panelType] : undefined
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return `[!${word ?? 'NOTE'}]`
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}
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export function readAlertMarker(text: string): AlertMarker | undefined {
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const marker = /^\[!([\w-]+)\]([+-]?)/.exec(text)
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if (marker === null) return undefined
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const word = (marker[1] ?? '').toLowerCase()
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const panelType = Object.hasOwn(panelTypesByWord, word) ? panelTypesByWord[word] : undefined
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return { folded: marker[2] !== '', length: marker[0].length, panelType: panelType ?? 'info' }
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}
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// A marker leads text that ends at it or goes on past whitespace or a hard break.
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export function leadingMarker<T extends { length: number }>(text: string, read: (text: string) => T | undefined): T | undefined {
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const marker = read(text)
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if (marker === undefined) return undefined
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const rest = text.slice(marker.length, marker.length + 2)
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return rest === '' || /^(?:[ \t\n]|\\\n)/.test(rest) ? marker : undefined
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}
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// A delimiter is bounded outside by the code point beyond it, and flanks by the character inside it.
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export function highlightFlanking(source: string, index: number): { closes: boolean; opens: boolean } {
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const end = index + highlightDelimiter.length
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const before = Array.from(source.slice(Math.max(0, index - 2), index)).at(-1) ?? ''
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const after = Array.from(source.slice(end, end + 2))[0] ?? ''
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return { closes: flanks(before) && bounds(after, before), opens: flanks(after) && bounds(before, after) }
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}
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function bounds(outside: string, inside: string): boolean {
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return !isWordCharacter(outside) || boundingScript.test(outside) || boundingScript.test(inside)
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}
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function flanks(character: string): boolean {
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return character !== '' && !/\s/.test(character)
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}
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export function taskMarker(state: unknown): string {
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return state === 'DONE' ? '[x]' : '[ ]'
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}
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export function readTaskMarker(text: string): { length: number; state: 'DONE' | 'TODO' } | undefined {
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const marker = /^\[([ xX])\]/.exec(text)
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if (marker === null) return undefined
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return { length: marker[0].length, state: marker[1] === ' ' ? 'TODO' : 'DONE' }
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}
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