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Adding API to get field name of a TSNode

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This PR adds an API to get name of the field of TSNode's child.
It uses same set of arguments as that of ts_node_child, but returns
field name if it is found, otherwise it returns NULL.

This API is useful to implement custom printing of S-expressions such
as following:

"(binary_expression
   (binary_expression_left (identifier))
   (binary_expression_operator ("+"))
   (binary_expression_right (identifier)
)"

Currently, ts_node_string does not allow any customization for printing.
This commit is contained in:
Niranjan Hasabnis 2021-05-15 00:18:32 +00:00
parent 6abf77a20c
commit dffee22736
2 changed files with 23 additions and 0 deletions
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6
lib/include/tree_sitter/api.h
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@ -487,6 +487,12 @@ TSNode ts_node_parent(TSNode);
*/
TSNode ts_node_child(TSNode, uint32_t);
/**
* Get the field_name for node's child at the given index, where zero represents
* the first child. Returns NULL, if no field is found.
*/
const char *ts_node_child_field_name(TSNode, uint32_t);
/**
* Get the node's number of children.
*/