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Fix #1999, fix #2002: Alt italics regex without lookbehind (#2035)

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Chen-I Lim 2022-01-03 21:07:47 -08:00 committed by GitHub
parent 198c5861d8
commit c6e9d670da
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1 changed files with 16 additions and 4 deletions
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20
webapp/src/components/live-markdown-plugin/inline-styles/italicStyleStrategy.ts
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@ -11,10 +11,22 @@ const createItalicStyleStrategy = (): InlineStrategy => {
'(?<=\\*\\*)(\\*)(?!\\*)(.*?[^\\*]+)(?<!\\*)\\*(?![^\\*]\\*)|(?<!\\*)(\\*)(?!\\*)(.*?[^\\*]+)(?<!\\*)\\*(?=\\*\\*)' // ***italic* and bold** **bold and *italic***
const boldWrappedUnderscoreRegex =
'(?<=__)(_)(?!_)(.*?[^_]+)(?<!_)_(?![^_]_)|(?<!_)(_)(?!_)(.*?[^_]+)(?<!_)_(?=__)' // ___italic_ and bold__ __bold and _italic___
const italicRegex = new RegExp(
`${asteriskDelimitedRegex}|${underscoreDelimitedRegex}|${strongEmphasisRegex}|${boldWrappedAsteriskRegex}|${boldWrappedUnderscoreRegex}`,
'g',
)
let italicRegex: RegExp
try {
italicRegex = new RegExp(
`${asteriskDelimitedRegex}|${underscoreDelimitedRegex}|${strongEmphasisRegex}|${boldWrappedAsteriskRegex}|${boldWrappedUnderscoreRegex}`,
'g',
)
} catch {
// Safari (as of 15.2) doesn't support RegEx lookbacks (https://caniuse.com/js-regexp-lookbehind)
const altAsteriskDelimitedRegex = '([^\\*]|^)(\\*)([^\\*]+)(\\*)(?!\\*)' // *italic*
const altUnderscoreDelimitedRegex = '([^_]|^)(_)([^_]+)(_)(?!_)' // _italic_
// TODO: Add support for boldWrappedAsteriskRegex and boldWrappedUnderscoreRegex
italicRegex = new RegExp(
`${altAsteriskDelimitedRegex}|${altUnderscoreDelimitedRegex}|${strongEmphasisRegex}`,
'g',
)
}
const italicDelimiterRegex = /^(\*\*\*|\*|___|_)|(\*\*\*|\*|___|_)$/g