Ruby

The Ruby extractor maps tree-sitter Ruby CST nodes to canonical concepts. Class and module names come from the name field on constants; method names from the name field on identifiers.

Detected concepts

tree-sitter node type	Canonical concept
`class`	Class
`module`	Module
`method`	Method
`call`	CallExpression
`assignment`	Assignment
`instance_variable`	Variable
`constant`	Constant
`if` / `unless` / `if_modifier`	IfBlock
`while` / `until`	WhileLoop
`block` / `do_block`	Block
`array`	ArrayLiteral
`hash`	ObjectLiteral
`string`	string_literal

Example

Renaming a method:

old.rb

class Counter
  def total(n)
    n + 1
  end
end

new.rb

class Counter
  def sum(n)
    n + 1
  end
end

Running differens old.rb new.rb:

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

Example: change the body

Keep the declaration name and change what it does:

class Counter
  def total(n)
    n + 1
  end
end

class Counter
  def total(n)
    n + 2
  end
end

differens body-before.rb body-after.rb

  ~ changed method `total` (`1` → `2`)

The report groups the value edit under its containing declaration. Use --format=json to inspect the underlying action and context, or --format=llm for a compact report with source locations.

Known limitations

Dynamic method definition (define_method) is a call, not a method: names built at runtime are invisible to the extractor.
true, false, and nil are anonymous tokens in the grammar. The native parser retains their token text, so changes between them remain visible.

Semantic Extractors

Tier Adapters

Detected concepts

Example

Example: change the body

Known limitations