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

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

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.
substitute: If TRUE, expr is substitute():ed.

Value