Modern Editor Architecture

Beyond the toy:

LSP (Language Server Protocol):

• Standardized API between editor and language tools.
• Compiler/IDE features: autocomplete, go-to-definition, rename, errors, hover.
• One server per language; works in any LSP-compatible editor.
• Servers: rust-analyzer, pyright, gopls, typescript-language-server.

Tree-sitter:

• Incremental parser for many languages.
• Used for syntax highlighting, structural editing, refactoring.
• Tiny per-edit re-parse cost.

LSP + Tree-sitter = modern editor backbone.

Plugin systems:

• VS Code: TypeScript/JS plugins. Massive ecosystem (100k+ extensions).
• Vim/Neovim: Vimscript + Lua plugins.
• Emacs: Lisp.
• IntelliJ: Java/Kotlin.
• Modern: WebAssembly plugins (for sandboxing).

Multiplayer (collaborative editing):

• Real-time sync between users.
• CRDTs (Conflict-free Replicated Data Types) for conflict resolution.
• Yjs, Automerge: popular CRDT libraries.
• Used by VS Code Live Share, Google Docs, Figma.

Rendering:

• Terminal: ANSI codes.
• GUI: native (Cocoa, Win32, GTK) or cross-platform (Qt, Electron).
• GPU-rendered: Zed, Helix can use GPU for smooth scrolling.

Workspace:

• Multi-pane / tabs / splits.
• Project-wide search.
• File tree.
• Integrated terminal.
• Debug UI.

Performance characteristics:

• Sublime Text: fastest. Native C++.
• VS Code: medium. Electron + V8.
• IntelliJ: slow startup, fast inside. JVM.
• Emacs: medium. Lots of init customization.
• Vim: instant. Tiny.
• Helix: very fast. Rust.

Editor wars:

• Vim vs Emacs (1980s+).
• IDE vs text editor (2000s).
• Native vs Electron (2020s).
• All have died down — pick what fits your workflow.

Modern trends:

• AI integration: GitHub Copilot, Cursor, Codeium.
• Local-first: works offline.
• Multiplayer: pair programming.
• GPU rendering: smooth at 120 Hz.
• Languages: Rust > C++ for new editors (Helix, Lapce, Zed).

For learning: build a Kilo-style editor in C (~1000 lines) or Python. Then expand: tree-sitter integration, LSP support. By the end, you understand what every key in vim does and why.

Don't roll your own for production. Use VS Code or Neovim. But do build one — it's the best way to learn how editors really work.