parse_env_subset

Helper function to infer target from expression and environment

internal

List environments are environments that have list-like properties. For instance, the elements of a list environment are ordered and can be accessed and iterated over using index subsetting, e.g. 'x <- listenv(a = 1, b = 2); for (i in seq_along(x)) x[[i]] <- x[[i]] ^ 2; y <- as.list(x)'.

Henrik Bengtsson

listenv

Environments Behaving (Almost) as Lists

parse_env_subset function

<dl><dt>expr</dt>
<dd>An expression.</dd>
<dt>envir</dt>
<dd>An environment.</dd>
<dt>substitute</dt>
<dd>If <code>TRUE</code>, then the expression is <code><a href="/link/base%3A%3Asubstitute()?package=listenv&version=0.10.0" data-mini-rdoc="listenv::base::substitute()">base::substitute()</a></code>:ed,
otherwise not.</dd>
<dt>is_variable</dt>
<dd>(logical) If TRUE and an element name is specified, then
the name is checked to be a valid variable name.</dd></dl>

Arguments

Helper function to infer target from expression and environment — parse_env_subset

<dl>

<dt>expr</dt>
<dd>An expression.</dd>


<dt>envir</dt>
<dd>An environment.</dd>


<dt>substitute</dt>
<dd>If <code>TRUE</code>, then the expression is <code><a href='https://rdrr.io/r/base/substitute.html'>base::substitute()</a></code>:ed,
otherwise not.</dd>


<dt>is_variable</dt>
<dd>(logical) If TRUE and an element name is specified, then
the name is checked to be a valid variable name.</dd>

</dl>

parse_env_subset: Helper function to infer target from expression and environment

Description

Usage

Value

Arguments