Implements a token-based expression extraction algorithm that walks backward from the cursor to identify the Go expression being completed (e.g., 'foo.bar.', '&Struct{field:'). It uses balanced bracket matching and type inference to deduce the declaration and struct type context. This component is self-contained (depends only on go/token and go/scanner) and could be extracted for any tool that needs to analyze cursor context in Go source code.

Parses compiled Go package exports in binary format (as produced by gc compiler). It handles versioning, object types (const, var, func, type, alias), type decoding (struct, interface, map, chan, etc.), and method reading. This parser is isolated and could be reused in other tools needing to inspect compiled Go package data without using 'go tool compile' or the standard library's lack of export data parser.

Manages persistent configuration with JSON file storage. Uses reflection to dynamically list, get, and set options defined as struct fields with json tags. Includes default values, validation (via string-to-bool map), and pretty-printing with colored descriptions. This is a clean, reusable pattern for simple configuration management in Go tools.