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78 lines
2.5 KiB
TypeScript
78 lines
2.5 KiB
TypeScript
/*
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* Copyright (c) 2016-2022 Martin Donath <martin.donath@squidfunk.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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/* ----------------------------------------------------------------------------
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* Helper types
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* ------------------------------------------------------------------------- */
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/**
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* Visitor function
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*
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* @param start - Start offset
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* @param end - End offset
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*/
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type VisitorFn = (
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start: number, end: number
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) => void
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/* ----------------------------------------------------------------------------
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* Functions
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* ------------------------------------------------------------------------- */
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/**
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* Split a string using the given separator
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*
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* This function intentionally takes a visitor function contrary to collecting
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* and returning all ranges, as it's significantly more memory efficient.
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*
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* @param value - String value
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* @param separator - Separator
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* @param fn - Visitor function
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*/
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export function split(
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value: string, separator: RegExp, fn: VisitorFn
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): void {
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separator = new RegExp(separator, "g")
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/* Split string using separator */
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let match: RegExpExecArray | null
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let index = 0
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do {
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match = separator.exec(value)
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/* Emit non-empty range */
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const until = match?.index ?? value.length
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if (index < until)
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fn(index, until)
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/* Update last index */
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if (match) {
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const [term] = match
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index = match.index + term.length
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/* Support zero-length lookaheads */
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if (term.length === 0)
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separator.lastIndex = match.index + 1
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}
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} while (match)
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}
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