Helper function to infer target from expression and environment — parse_env_subset • listenv

Helper function to infer target from expression and environment

Usage

parse_env_subset(
  expr,
  envir = parent.frame(),
  substitute = TRUE,
  is_variable = TRUE
)

Arguments

expr: An expression.
envir: An environment.
substitute: If TRUE, then the expression is base::substitute():ed, otherwise not.
is_variable: (logical) If TRUE and an element name is specified, then the name is checked to be a valid variable name.

Value

A named list with elements:

envir: An environment (defaults to argument envir)
name: A character vector. ...
op: ...
subset: A list of NULL. ...
idx: An integer vector or NULL. ...
exists: A logical vector of length length(idx) with TRUE and FALSE values.
code: The deparsed expression expr coerced to a single character string.