Get a node's children

These functions return the children of x within a list.

• node_children() considers both named and anonymous children.

• node_named_children() considers only named children.

Usage

node_children(x)

node_named_children(x)

Arguments

x

[tree_sitter_node]

A node.

Value

The children of x as a list.

Examples

language <- treesitter.r::language()
parser <- parser(language)

text <- "fn <- function() { 1 + 1 }"
tree <- parser_parse(parser, text)
node <- tree_root_node(tree)

# Navigate to first child
node <- node_child(node, 1)
node
#> <tree_sitter_node>
#> 
#> ── Text ──────────────────────────────────────────────────────────────────
#> fn <- function() { 1 + 1 }
#> 
#> ── S-Expression ──────────────────────────────────────────────────────────
#> (binary_operator [(0, 0), (0, 26)]
#>   lhs: (identifier [(0, 0), (0, 2)])
#>   operator: "<-" [(0, 3), (0, 5)]
#>   rhs: (function_definition [(0, 6), (0, 26)]
#>     name: "function" [(0, 6), (0, 14)]
#>     parameters: (parameters [(0, 14), (0, 16)]
#>       open: "(" [(0, 14), (0, 15)]
#>       close: ")" [(0, 15), (0, 16)]
#>     )
#>     body: (braced_expression [(0, 17), (0, 26)]
#>       open: "{" [(0, 17), (0, 18)]
#>       body: (binary_operator [(0, 19), (0, 24)]
#>         lhs: (float [(0, 19), (0, 20)])
#>         operator: "+" [(0, 21), (0, 22)]
#>         rhs: (float [(0, 23), (0, 24)])
#>       )
#>       close: "}" [(0, 25), (0, 26)]
#>     )
#>   )
#> )

# Note how the named variant doesn't include the anonymous operator node
node_children(node)
#> [[1]]
#> <tree_sitter_node>
#> 
#> ── Text ──────────────────────────────────────────────────────────────────
#> fn
#> 
#> ── S-Expression ──────────────────────────────────────────────────────────
#> (identifier [(0, 0), (0, 2)])
#> 
#> [[2]]
#> <tree_sitter_node>
#> 
#> ── Text ──────────────────────────────────────────────────────────────────
#> <-
#> 
#> ── S-Expression ──────────────────────────────────────────────────────────
#> "<-" [(0, 3), (0, 5)]
#> 
#> [[3]]
#> <tree_sitter_node>
#> 
#> ── Text ──────────────────────────────────────────────────────────────────
#> function() { 1 + 1 }
#> 
#> ── S-Expression ──────────────────────────────────────────────────────────
#> (function_definition [(0, 6), (0, 26)]
#>   name: "function" [(0, 6), (0, 14)]
#>   parameters: (parameters [(0, 14), (0, 16)]
#>     open: "(" [(0, 14), (0, 15)]
#>     close: ")" [(0, 15), (0, 16)]
#>   )
#>   body: (braced_expression [(0, 17), (0, 26)]
#>     open: "{" [(0, 17), (0, 18)]
#>     body: (binary_operator [(0, 19), (0, 24)]
#>       lhs: (float [(0, 19), (0, 20)])
#>       operator: "+" [(0, 21), (0, 22)]
#>       rhs: (float [(0, 23), (0, 24)])
#>     )
#>     close: "}" [(0, 25), (0, 26)]
#>   )
#> )
#> 
node_named_children(node)
#> [[1]]
#> <tree_sitter_node>
#> 
#> ── Text ──────────────────────────────────────────────────────────────────
#> fn
#> 
#> ── S-Expression ──────────────────────────────────────────────────────────
#> (identifier [(0, 0), (0, 2)])
#> 
#> [[2]]
#> <tree_sitter_node>
#> 
#> ── Text ──────────────────────────────────────────────────────────────────
#> function() { 1 + 1 }
#> 
#> ── S-Expression ──────────────────────────────────────────────────────────
#> (function_definition [(0, 6), (0, 26)]
#>   name: "function" [(0, 6), (0, 14)]
#>   parameters: (parameters [(0, 14), (0, 16)]
#>     open: "(" [(0, 14), (0, 15)]
#>     close: ")" [(0, 15), (0, 16)]
#>   )
#>   body: (braced_expression [(0, 17), (0, 26)]
#>     open: "{" [(0, 17), (0, 18)]
#>     body: (binary_operator [(0, 19), (0, 24)]
#>       lhs: (float [(0, 19), (0, 20)])
#>       operator: "+" [(0, 21), (0, 22)]
#>       rhs: (float [(0, 23), (0, 24)])
#>     )
#>     close: "}" [(0, 25), (0, 26)]
#>   )
#> )
#>