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4.2: a link's brackets balance inside a directive's content

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Lilleman auf Larv
2026-09-14 21:00:15 +02:00
parent eafd863a32
commit 9303235434
5 changed files with 143 additions and 21 deletions
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src/markdown/link-syntax.ts
+15 -15
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@@ -103,7 +103,7 @@ export function spellDestination(href: string, path: ConvertErrorPath): Result<s
return success(`<${href}>`)
}
if (href.startsWith('<')) return failure('unspellable-link', 'a bare link destination cannot begin with an angle bracket', path)
return success(escapeUnbalanced(href))
return success(escapeUnbalanced(href, '(', ')'))
}
export function spellLinkTarget(href: string, title: string | undefined, path: ConvertErrorPath): Result<string> {
@@ -114,6 +114,20 @@ export function spellLinkTarget(href: string, title: string | undefined, path: C
return success(`${destination.value === '' ? '<>' : destination.value}${spelledTitle.value}`)
}
export function escapeUnbalanced(spelling: string, opener: string, closer: string): string {
const open: number[] = []
const unbalanced = new Set<number>()
for (let index = 0; index < spelling.length; index += backslashEscape(spelling, index) === undefined ? 1 : 2) {
const character = spelling.charAt(index)
if (character === opener) open.push(index)
if (character === closer && open.pop() === undefined) unbalanced.add(index)
}
for (const index of open) unbalanced.add(index)
let spelled = ''
for (let index = 0; index < spelling.length; index += 1) spelled += (unbalanced.has(index) ? '\\' : '') + spelling.charAt(index)
return spelled
}
function spellTitle(title: string, path: ConvertErrorPath): Result<string> {
if (/[\n\r\\]/.test(title)) {
return failure('unspellable-link', 'no canonical escape spells a backslash or newline in a link title', path)
@@ -121,17 +135,3 @@ function spellTitle(title: string, path: ConvertErrorPath): Result<string> {
if (holdsEntityReference(title)) return failure('unspellable-link', 'a link title holds an entity reference that decodes on the way back', path)
return success(` "${title.replaceAll('"', '\\"')}"`)
}
function escapeUnbalanced(href: string): string {
const open: number[] = []
const unbalanced = new Set<number>()
for (let index = 0; index < href.length; index += 1) {
const character = href.charAt(index)
if (character === '(') open.push(index)
if (character === ')' && open.pop() === undefined) unbalanced.add(index)
}
for (const index of open) unbalanced.add(index)
let spelled = ''
for (let index = 0; index < href.length; index += 1) spelled += (unbalanced.has(index) ? '\\' : '') + href.charAt(index)
return spelled
}