node-info: Get more precise information on a node

In astgrepr: Parse and Manipulate R Code

Get more precise information on a node

Description

Get more precise information on a node

Usage

node_matches(x, ..., files = NULL)

node_inside(x, ..., files = NULL)

node_has(x, ..., files = NULL)

node_precedes(x, ..., files = NULL)

node_follows(x, ..., files = NULL)

Arguments

x	A node, either from tree_root() or from another ⁠node_*()⁠ function.
...	Any number of rules created with ast_rule().
files	A vector of filenames containing rules. Those must be .yaml files.

Value

A list containing as many elements as there are nodes as input.

Examples

src <- "
print('hi')
fn <- function() {
  print('hello')
}
"
root <- src |>
  tree_new() |>
  tree_root()

some_node <- root |>
  node_find(ast_rule(pattern = "print($A)"))

node_text(some_node)

# Check if a node matches a specific rule
some_node |>
  node_get_match("A") |>
  node_matches(ast_rule(kind = "argument"))

# Check if a node is inside another one
some_node |>
  node_get_match("A") |>
  node_inside(ast_rule(kind = "call"))

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