tree-sitter-c-sharp

C# grammar for tree-sitter based upon the Roslyn grammar with changes in order to:

• Deal with differences between the parsing technologies

• Work around some bugs in that grammar

• Handle #if, #else, #elif, #endif blocks

• Support syntax highlighting/parsing of fragments

• Simplify the output tree

Status

Comprehensive supports C# 1 through 10.0 with the following exceptions:

• async, var and await cannot be used as identifiers everywhere they are valid

C# 9.0 (complete)

• x Covariant returns

• x Extending partial methods

• x Extension GetEnumerator

• x Function pointers

• x Init properties

• x Lambda discard parameters

• x Local function attributes

• x Module initializers

• x Native integers

• x Patterns

- x Simple type patterns - x Relational patterns - x Logical patterns

• x Records

• x Skip Locals Init

• x Static anonymous functions

• x Target-typed conditional expression

• x Target-typed new

• x Top-level statements

C# 10.0

• x global using directives

• x File-scoped namespace declaration

• x Extended property patterns

• x Allow const interpolated strings

• x Record types can seal ToString()

• x Allow both assignment and declaration in the same deconstruction

• x Allow AsyncMethodBuilder attribute on methods

• x Record structs

• Lambda improvements

C# 11.0 (under development)

• x Generic attributes

• x Static abstract members in interfaces

• x Newlines in string interpolations

• x List patterns

• x Slice pattern

• x Required members

• Raw string literals

References

• Official C# 6 Language Spec provides chapters that formally define the language grammar.

• Roslyn C# language grammar export

• SharpLab (web-based syntax tree playground based on Roslyn)