sdf-parser/lib/getEntriesBoundaries.js

SDF parser

/**
 * Get the [start, end] boundaries of each SDF entry in a string.
 *
 * Uses `indexOf` for fast splitting without regex overhead.
 * @param string - The full SDF string.
 * @param substring - The delimiter to search for (e.g. `'\n$$$$'`).
 * @param eol - The end-of-line character used to skip past the delimiter line.
 * @returns An array of `[start, end]` index pairs, one per SDF entry.
 */
export function getEntriesBoundaries(string, substring, eol) {
    const res = [];
    let previous = 0;
    let next = 0;
    while (next !== -1) {
        next = string.indexOf(substring, previous);
        if (next !== -1) {
            res.push([previous, next]);
            const nextMatch = string.indexOf(eol, next + substring.length);
            if (nextMatch === -1) {
                next = -1;
            }
            else {
                previous = nextMatch + eol.length;
                next = previous;
            }
        }
        else {
            res.push([previous, string.length]);
        }
    }
    return res;
}
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