Scala - Differens

Scala extractor

The Scala extractor maps tree-sitter Scala CST nodes to canonical concepts. Class, object, and definition names come from the standard name field; val and var names come from the pattern field.

Detected concepts

tree-sitter node type	Canonical concept
`class_definition`	Class
`trait_definition`	Trait
`object_definition`	SingletonObject
`function_definition`	Function
`val_definition`	Constant
`var_definition`	Variable
`package_clause`	Namespace
`import_declaration`	Import
`if_expression`	IfBlock
`match_expression`	MatchBlock
`string`	string_literal
`boolean_literal`	boolean_literal

Example

Renaming a method:

// old.scala
class Counter { def total(n: Int): Int = n + 1 }

// new.scala
class Counter { def sum(n: Int): Int = n + 1 }

Running differens old.scala new.scala:

~ renamed function `total` to `sum` in class `Counter`

Known limitations

Implicits and given clauses are structure: adding one reports as an insert on the declaration.
var definitions in some template contexts produce an ERROR node in the grammar; they parse cleanly in class and object bodies.