Toarnbeike.SourceGeneration

Toarnbeike.SourceGeneration is a utility library for building incremental source generators. It provides reusable abstractions for working with Roslyn, focused on improving readability, correctness, and composability of generator pipelines.

This library is currently intended for internal use and experimentation.

Design philosophy

The library follows the natural stages of an incremental source generator:

Discovery -> Selection -> Semantics -> Modeling -> Rendering

Each namespace in this library maps to one of these concerns.

The goal is to:

• reduce boilerplate
• enforce correct Roslyn usage (symbol-based, incremental-safe)
• improve readability of generator code

Selection

Selection is the entry point of the incremental pipeline.

Instead of manually writing CreateSyntaxProvider logic, the library provides higher-level abstractions for common patterns.

Example

var types = context.ForAttribute<MyAttribute>();

Available

• ForAttribute
  • Finds all types annotated with TAttribute
  • Handles syntax filtering + semantic validation

Planned

• ForInterface
• ForBaseType

Semantics

Semantic helpers operate on Roslyn symbols (ISymbol, INamedTypeSymbol, etc.).

These extensions aim to:

• replace string-based matching with symbol-based matching
• simplify attribute and type inspection
• provide consistent formatting

The following extensions are provided:

Attributes

• AttributeDataExtensions - get data supplied by the attribute
• AttributeSymbolExtensions - check if symbol is annotated with attribute, and/or return attribute data

Types

• display helpers
• todo: interface checks

Models

Common models are provided by the library:

• ConstructorParameterModel(string TypeName, string Name, string? XmlDescription) with rendering options.

Rendering

Rendering helpers assist in generating source code strings.

These are intentionally simple primitives, not a templating system.

Available

• UsingBuilder - build using statements from provided types
• TextRenderingExtensions
  • JoinLines
  • JoinCommaSeparatedLines
  • Indent

Notes

Rendering operates on

• strings
• Roslyn symbols (preferred over raw strings)

Naming

Helpers for consistent naming conventions.

• ToCamelCase()

Documentation

Helpers for reading XML documentation from symbols.

• XmlDocumentationExtensions
  • extract <param> documentation from methods

Utilities

Low-level helpers that are not provided by netstandard2.0.

• HashCodeHelper