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

walkAST {globals} | R Documentation

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

### Description

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

### Usage

    walkAST(expr, atomic = NULL, name = NULL, call = NULL, pairlist = NULL,
      substitute = FALSE)

### Arguments

`expr` | R expression.
`atomic, name, call, pairlist` | single-argument function that takes an atomic, name, call and pairlist expression, respectively. Have to return a valid R expression.
`name` | single-argument function that takes a name expression.
`call` | single-argument function that takes a call expression.
`pairlist` | single-argument function that takes a pairlist expression.
`substitute` | If TRUE, `expr` is `substitute()`:ed.

### Value

R expression.

[Package globals version 0.10.2 Index]