walkAST

Walk the Abstract Syntax Tree (AST) of an R Expression

internal

programming

Identifies global ("unknown" or "free") objects in R expressions
by code inspection using various strategies (ordered, liberal, or
conservative).  The objective of this package is to make it as simple as
possible to identify global objects for the purpose of exporting them in
parallel, distributed compute environments.

Henrik Bengtsson

globals

Identify Global Objects in R Expressions

Davis Vaughan

walkAST function

<dl><dt>expr</dt>
<dd>R <a href="/link/expression?package=globals&version=0.17.0" data-mini-rdoc="globals::expression">expression</a>.</dd>
<dt>atomic, name, call, pairlist</dt>
<dd>single-argument function that takes an
atomic, name, call and pairlist expression, respectively. Have to
return a valid R expression.</dd>
<dt>substitute</dt>
<dd>If TRUE, <code>expr</code> is
<code><a href="/link/substitute?package=globals&version=0.17.0" data-mini-rdoc="globals::substitute">substitute</a>()</code>:ed.</dd></dl>

Arguments

Walk the Abstract Syntax Tree (AST) of an R Expression — walkAST

<dl>

<dt>expr</dt>
<dd>R <a href='https://rdrr.io/r/base/expression.html'>expression</a>.</dd>


<dt>atomic, name, call, pairlist</dt>
<dd>single-argument function that takes an
atomic, name, call and pairlist expression, respectively. Have to
return a valid R expression.</dd>


<dt>substitute</dt>
<dd>If TRUE, <code>expr</code> is
<code><a href='https://rdrr.io/r/base/substitute.html'>substitute</a>()</code>:ed.</dd>

</dl>

walkAST: Walk the Abstract Syntax Tree (AST) of an R Expression

Description

Usage

Value

Arguments