Alignment and reference sequence from CIGAR and MD #110
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johanneskoester
requested changes
Sep 14, 2018
…all other iterators & position representations. Updated record interface accordingly.
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I would like to know if there is a function to get alignment pair now. In other similar htslib bindings, the reference sequence with the query sequence can be fetch in the same time. |
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Is there any particular blocker for this work? I'd be happy to help get it over the line if necessary. |
johanneskoester
requested changes
Nov 12, 2024
Comment on lines
+947
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| quick_error! { | ||
| #[derive(Debug,Clone)] | ||
| pub enum MDAlignError { | ||
| NoMD { | ||
| description("no MD aux field") | ||
| } | ||
| BadMD { | ||
| description("bad MD value") | ||
| } | ||
| MDvsCIGAR { | ||
| description("MD inconsistent with CIGAR") | ||
| } | ||
| BadSeqLen { | ||
| description("Sequence/quality length inconsistent with MD/CIGAR") | ||
| } | ||
| EmptyAlign { | ||
| description("Alignment has no positions") | ||
| } | ||
| ParseInt(err: ::std::num::ParseIntError) { | ||
| from() | ||
| } | ||
| Utf8(err: ::std::str::Utf8Error) { | ||
| from() | ||
| } | ||
| } | ||
| } |
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We've moved to thiseeror, hence, this should be adapted and moved into errors.rs.
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This is a module that uses CIGAR and MD fields to construct alignments and reconstruct reference sequences from BAM records. I found myself wanting to do this repeatedly, and it isn't actually straightforward. I think these will be generally useful, based on the number of people requesting this feature in various languages.
This code features an MD field parser, a minimal alignment position type that includes only the information directly present in the CIGAR + MD fields, and more "complete" alignment types that use the read sequence to provide complete read and reference sequences directly in the alignment. These are all structured around iterators that generate individual positions, and can easily be collected into a vector if needed. I also added a function to create a bio-type Alignment.