Function getOpenCloseRange

src/utils/text.ts:96–141

(
    input: string,
    searchStartIndex: number,
    openToken: string,
    closeToken: string,
    excludeRanges: TextRange[],
)

}

export function getOpenCloseRange(
    input: string,
    searchStartIndex: number,
    openToken: string,
    closeToken: string,
    excludeRanges: TextRange[],
): TextRange | null {
    let indexOf: (token: string, pos: number) => number;
    if (excludeRanges.length === 0) {
        indexOf = (token: string, pos: number) => input.indexOf(token, pos);
    } else {
        indexOf = (token: string, pos: number) => indexOfExcluding(input, token, pos, excludeRanges);
    }

    const {length} = input;
    let depth = 0;
    let firstOpenIndex = -1;
    for (let i = searchStartIndex; i < length; i++) {
        if (depth === 0) {
            const openIndex = indexOf(openToken, i);
            if (openIndex < 0) {
                break;
            }
            firstOpenIndex = openIndex;
            depth++;
            i = openIndex;
        } else {
            const closeIndex = indexOf(closeToken, i);
            if (closeIndex < 0) {
                break;
            }
            const openIndex = indexOf(openToken, i);
            if (openIndex < 0 || closeIndex <= openIndex) {
                depth--;
                if (depth === 0) {
                    return {start: firstOpenIndex, end: closeIndex + 1};
                }
                i = closeIndex;
            } else {
                depth++;
                i = openIndex;
            }
        }
    }
    return null;
}

function indexOfExcluding(input: string, search: string, position: number, excludeRanges: TextRange[]) {
    const i = input.indexOf(search, position);