globals: walkAST – R documentation

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walkAST

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

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

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

`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.

Identify Global Objects in R Expressions

v0.14.0

LGPL (>= 2.1)

Authors

Henrik Bengtsson [aut, cre, cph], Davis Vaughan [ctb]

Initial release