walkAST {globals} | R Documentation |
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. |
substitute |
If TRUE, |
R expression.