ast-grep-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)

• Covariant returns
• Extending partial methods
• Extension GetEnumerator
• Function pointers
• Init properties
• Lambda discard parameters
• Local function attributes
• Module initializers
• Native integers
• Patterns
  • Simple type patterns
  • Relational patterns
  • Logical patterns
• Records
• Skip Locals Init
• Static anonymous functions
• Target-typed conditional expression
• Target-typed new
• Top-level statements

C# 10.0

• global using directives
• File-scoped namespace declaration
• Extended property patterns
• Allow const interpolated strings
• Record types can seal ToString()
• Allow both assignment and declaration in the same deconstruction
• Allow AsyncMethodBuilder attribute on methods
• Record structs
• Lambda improvements

C# 11.0 (under development)

• Generic attributes
• Static abstract members in interfaces
• Newlines in string interpolations
• List patterns
• Slice pattern
• 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)