tree_root_node() is the entry point for accessing nodes within
a specific tree. It returns the "root" of the tree, from which you
can use other node_*() functions to navigate around.
Examples
language <- treesitter.r::language()
parser <- parser(language)
text <- "fn <- function() { 1 + 1 }"
tree <- parser_parse(parser, text)
node <- tree_root_node(tree)
# Trees and nodes have a similar print method, but you can
# only use other `node_*()` functions on nodes.
tree
#> <tree_sitter_tree>
#>
#> ── Text ──────────────────────────────────────────────────────────────────
#> fn <- function() { 1 + 1 }
#>
#> ── S-Expression ──────────────────────────────────────────────────────────
#> (program [(0, 0), (0, 26)]
#> (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)]
#> )
#> )
#> )
#> )
node
#> <tree_sitter_node>
#>
#> ── Text ──────────────────────────────────────────────────────────────────
#> fn <- function() { 1 + 1 }
#>
#> ── S-Expression ──────────────────────────────────────────────────────────
#> (program [(0, 0), (0, 26)]
#> (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)]
#> )
#> )
#> )
#> )
node |>
node_child(1) |>
node_children()
#> [[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)]
#> )
#> )
#>