node-range: Get the start and end positions of a node

In astgrepr: Parse and Manipulate R Code

Get the start and end positions of a node

Description

Get the start and end positions of a node

Usage

node_range(x)

node_range_all(x)

Arguments

x	A node, either from tree_root() or from another ⁠node_*()⁠ function.

Value

A list of two elements: start and end. Each of those is a vector with two values indicating the row and column. Those are 0-indexed.

Examples

src <- "x <- rnorm(100, mean = 2)
    any(duplicated(y))
    plot(x)
    any(duplicated(x))"

root <- src |>
  tree_new() |>
  tree_root()

node_range(root)

root |>
  node_find(ast_rule(pattern = "rnorm($$$A)")) |>
  node_range()

# There is also an "_all" variant when there are several nodes per rule
root |>
  node_find_all(
    ast_rule(pattern = "any(duplicated($A))"),
    ast_rule(pattern = "plot($A)")
  ) |>
  node_range_all()

astgrepr documentation built on June 8, 2025, 11:05 a.m.