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# 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
• ☑ File scoped classes
• ☐ Raw string literals
• ☑ File scoped types
• ☑ Scoped ref

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)