Skip to contents

Evaluate a SeqMap against GRanges or data.frame data

Source: R/map_aes.R
dot-resolve_mapping.Rd

Internal helper. Builds an evaluation environment from data and evaluates each expression in mapping against it.

Usage

.resolve_mapping(data, mapping, env = parent.frame())

Arguments

data

A GRanges or data.frame.

mapping

A SeqMap object (or NULL).

env

The enclosing environment for expression evaluation.

Value

A named list of resolved vectors, one per mapping field.

Details

For a GRanges, the env is the union of:

  • positional specials: start, end, width, mid

  • GRanges accessors: seqnames, strand (coerced to character)

  • the columns of mcols(data)

For a data.frame, the env is just as.list(data) — no specials are injected, so column names must match the user's map() references exactly. (Link elements rely on this: BEDPE-like inputs reference their own column names via map(x0 = start1, x1 = start2, ...).)

If mapping is NULL or data is NULL, returns list().