Function buildWhitespaceTolerantRegex

src/core/tools/EditFileTool.ts:87–116

(oldLF: string)

}

function buildWhitespaceTolerantRegex(oldLF: string): RegExp {
	if (oldLF === "") {
		// Never match empty string
		return new RegExp("(?!)", "g")
	}

	const parts = oldLF.match(/(\s+|\S+)/g) ?? []
	const whitespacePatternForRun = (run: string): string => {
		// If the whitespace run includes a newline, allow matching any whitespace (including newlines)
		// to tolerate wrapping changes across lines.
		if (run.includes("\n")) {
			return "\\s+"
		}

		// Otherwise, limit matching to horizontal whitespace so we don't accidentally consume
		// line breaks that precede indentation.
		return "[\\t ]+"
	}

	const pattern = parts
		.map((part) => {
			if (/^\s+$/.test(part)) {
				return whitespacePatternForRun(part)
			}
			return escapeRegExp(part)
		})
		.join("")

	return new RegExp(pattern, "g")
}

function buildTokenRegex(oldLF: string): RegExp {
	const tokens = oldLF.split(/\s+/).filter(Boolean)