@gmod/bbi/esm/util.js

Parser for BigWig/BigBed files

export class AbortError extends Error {
    constructor(message) {
        super(message);
        this.code = 'ERR_ABORTED';
    }
}
// sort blocks by file offset and
// group blocks that are within 2KB of eachother
export function groupBlocks(blocks) {
    blocks.sort((b0, b1) => b0.offset - b1.offset);
    const blockGroups = [];
    let lastBlock;
    let lastBlockEnd;
    for (const block of blocks) {
        if (lastBlock && lastBlockEnd && block.offset - lastBlockEnd <= 2000) {
            lastBlock.length =
                lastBlock.length + block.length - lastBlockEnd + block.offset;
            lastBlock.blocks.push(block);
        }
        else {
            blockGroups.push((lastBlock = {
                blocks: [block],
                length: block.length,
                offset: block.offset,
            }));
        }
        lastBlockEnd = lastBlock.offset + lastBlock.length;
    }
    return blockGroups;
}
/**
 * Properly check if the given AbortSignal is aborted. Per the standard, if the
 * signal reads as aborted, this function throws either a DOMException
 * AbortError, or a regular error with a `code` attribute set to `ERR_ABORTED`.
 *
 * For convenience, passing `undefined` is a no-op
 *
 * @param {AbortSignal} [signal] an AbortSignal, or anything with an `aborted` attribute
 * @returns nothing
 */
export function checkAbortSignal(signal) {
    if (!signal) {
        return;
    }
    if (signal.aborted) {
        if (typeof DOMException === 'undefined') {
            const e = new AbortError('aborted');
            e.code = 'ERR_ABORTED';
            throw e;
        }
        else {
            throw new DOMException('aborted', 'AbortError');
        }
    }
}
/**
 * Skips to the next tick, then runs `checkAbortSignal`.
 * Await this to inside an otherwise synchronous loop to
 * provide a place to break when an abort signal is received.
 * @param {AbortSignal} signal
 */
export async function abortBreakPoint(signal) {
    await Promise.resolve();
    checkAbortSignal(signal);
}
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