This repository is the compiler toolchain for the Carbon Language, an experimental successor to C++ focused on performance, C++ interoperability, and memory safety. The codebase implements a full compilation pipeline from lexing and parsing through semantic analysis (SemIR) to LLVM IR code generation, along with a language server (LSP), a formatting tool, and C++ interop via Clang integration. The architecture follows a phased compiler design with distinct modules for lex, parse, check, sem_ir, lower, and driver, all orchestrated through a Bazel build system. Key entry points include the main driver binary (`toolchain/driver/`) with subcommands like `compile`, `link`, `build`, `format`, and `language-server`, and the semantic checker (`toolchain/check/`) which handles type checking, generics, and impl resolution. The toolchain also features a robust diagnostics system, a custom high-performance hashtable, and an extensive file-based testing framework with automatic CHECK-line updates. The codebase is actively developed with frequent commits, extensive test coverage, and fuzz testing, though it remains experimental and subject to breaking changes.
Zircle is a JavaScript library for building circular, zoomable user interfaces using native custom elements. It recreates the original Zircle component family (z-canvas, z-view, z-spot, z-list, z-dialog) with Orbit for radial layout and Zumly for zoom navigation, eliminating the previous Vue dependency. The library provides a declarative HTML API via templates and a programmatic controller via `createZircle()`, supporting multiple independent canvases, themes, responsive sizing, and accessibility. Internal components include radial knobs, sliders, scrollbars, and pagination, all built with pointer, keyboard, and reduced-motion support. The architecture separates engine concerns: Orbit handles polar geometry and SVG progress rings; Zumly manages view history, zoom transitions, and hash routing; Zircle provides the component vocabulary and canvas lifecycle. Key entry points are the `z-canvas` custom element for declarative usage and the `createZircle()` function for programmatic integration. External dependencies are limited to @zumer/orbit and zumly, and the build produces ESM, standalone ESM, IIFE, and CSS bundles. The codebase demonstrates strong software craftsmanship with thorough browser tests across Chromium, Firefox, and WebKit, TypeScript declarations, a reusable base class (ZSurface) for light-DOM content distribution, and clean separation of control logic in control-utils.js. Several components (z-knob, z-scroll, z-dialog, z-list) implement complex interactive behaviors in a framework-agnostic way, making them valuable references for custom element development.