C# - Differens

The C# extractor maps tree-sitter C# CST nodes to canonical concepts. Class, method, and namespace names come from the standard name field; variable names come from the declarator.

Detected concepts

tree-sitter node type	Canonical concept
`class_declaration`	Class
`namespace_declaration`	Namespace
`using_directive`	Import
`method_declaration`	Method
`variable_declaration`	Variable
`parameter_list`	Parameters
`invocation_expression`	CallExpression
`member_access_expression`	MemberAccess
`conditional_expression`	TernaryOp
`predefined_type`	TypeIdentifier
`string_literal`	string_literal
`integer_literal`	integer_literal

Example

Renaming a method:

old.cs

class Counter { int Total(int n) { return n + 1; } }

new.cs

class Counter { int Sum(int n) { return n + 1; } }

Running differens old.cs new.cs:

  ~ renamed method `Total` to `Sum` in class `Counter`

Example: change the body

Keep the declaration name and change what it does:

class Counter { int Total(int n) { return n + 1; } }

class Counter { int Total(int n) { return n + 2; } }

differens body-before.cs body-after.cs

  ~ 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

Partial classes across files are correlated per file; the cross-file correlator pairs moved members when the whole changeset is diffed at once.
LINQ query syntax uses its grammar nodes where no canonical concept mapping exists; the extractor does not infer query behavior.

Semantic Extractors

Tier Adapters

C#

Detected concepts

Example

Example: change the body

Known limitations