Basic usage
This interactive playground allows you to write R code and see how the tree-sitter parser analyzes its syntax structure. The tree-sitter grammar for R enables precise parsing of R code for various applications like syntax highlighting, code navigation, and static analysis.
You can:
- Enter R code in the editor on the left
- See the parsed syntax tree on the right
- Click in the code to highlight the corresponding node
- Click on a tree node to highlight the corresponding code
Advanced Features
Query Mode
Toggle on the “query” checkbox to use tree-sitter queries. This allows you to write pattern-matching expressions to find nodes in your code.
Example queries:
(function_definition) @functionThis will match all function definitions in your code.
(binary (identifier) @left_id (#eq? @left_id "x"))This will match binary expressions where the left operand is the identifier “x”.
Anonymous Nodes
Toggle on “show anonymous nodes” to display all nodes in the tree, including unnamed ones like operators and punctuation.
Unimplemented features
The “log” and “accessibility” checkboxes may not be functioning here (yet), but have just been ported over from the analogous page in the documentation for tree-sitter itself: https://tree-sitter.github.io/tree-sitter/7-playground.html. For that matter, the “query” functionality may also not really be working (yet).
About Tree-sitter
Tree-sitter is a parser generator tool and incremental parsing library. It can build a concrete syntax tree for source files and efficiently update the syntax tree as the source file is edited.
The tree-sitter-r grammar enables precise parsing of R code for various applications like syntax highlighting, code navigation, and static analysis.