@gmod/cram/esm/sam.js

read CRAM files with pure Javascript

export function parseHeaderText(text) {
    const lines = text.split(/\r?\n/);
    const data = [];
    for (const line of lines) {
        const [tag, ...fields] = line.split(/\t/);
        if (tag) {
            data.push({
                tag: tag.slice(1),
                data: fields.map(f => {
                    const r = f.indexOf(':');
                    return r !== -1
                        ? {
                            tag: f.slice(0, r),
                            value: f.slice(r + 1),
                        }
                        : // @CO lines are not comma separated.
                            // See "samtools view -H c2\#pad.3.0.cram"
                            // so, just store value tag and value itself
                            {
                                tag: f,
                                value: '',
                            };
                }),
            });
        }
    }
    return data;
}
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