75 lines
1.8 KiB
Plaintext
75 lines
1.8 KiB
Plaintext
const REGEX_SPECIAL = /[\\^$.*+?()[\]{}|]/g
|
|
const REGEX_HAS_SPECIAL = RegExp(REGEX_SPECIAL.source)
|
|
|
|
/**
|
|
* @param {string|RegExp|Array<string|RegExp>} source
|
|
*/
|
|
function toSource(source) {
|
|
source = Array.isArray(source) ? source : [source]
|
|
|
|
source = source.map((item) => (item instanceof RegExp ? item.source : item))
|
|
|
|
return source.join('')
|
|
}
|
|
|
|
/**
|
|
* @param {string|RegExp|Array<string|RegExp>} source
|
|
*/
|
|
export function pattern(source) {
|
|
return new RegExp(toSource(source), 'g')
|
|
}
|
|
|
|
/**
|
|
* @param {string|RegExp|Array<string|RegExp>} source
|
|
*/
|
|
export function withoutCapturing(source) {
|
|
return new RegExp(`(?:${toSource(source)})`, 'g')
|
|
}
|
|
|
|
/**
|
|
* @param {Array<string|RegExp>} sources
|
|
*/
|
|
export function any(sources) {
|
|
return `(?:${sources.map(toSource).join('|')})`
|
|
}
|
|
|
|
/**
|
|
* @param {string|RegExp} source
|
|
*/
|
|
export function optional(source) {
|
|
return `(?:${toSource(source)})?`
|
|
}
|
|
|
|
/**
|
|
* @param {string|RegExp|Array<string|RegExp>} source
|
|
*/
|
|
export function zeroOrMore(source) {
|
|
return `(?:${toSource(source)})*`
|
|
}
|
|
|
|
/**
|
|
* Generate a RegExp that matches balanced brackets for a given depth
|
|
* We have to specify a depth because JS doesn't support recursive groups using ?R
|
|
*
|
|
* Based on https://stackoverflow.com/questions/17759004/how-to-match-string-within-parentheses-nested-in-java/17759264#17759264
|
|
*
|
|
* @param {string|RegExp|Array<string|RegExp>} source
|
|
*/
|
|
export function nestedBrackets(open, close, depth = 1) {
|
|
return withoutCapturing([
|
|
escape(open),
|
|
/[^\s]*/,
|
|
depth === 1
|
|
? `[^${escape(open)}${escape(close)}\s]*`
|
|
: any([`[^${escape(open)}${escape(close)}\s]*`, nestedBrackets(open, close, depth - 1)]),
|
|
/[^\s]*/,
|
|
escape(close),
|
|
])
|
|
}
|
|
|
|
export function escape(string) {
|
|
return string && REGEX_HAS_SPECIAL.test(string)
|
|
? string.replace(REGEX_SPECIAL, '\\$&')
|
|
: string || ''
|
|
}
|