rm-hull / jasengo / 19392372911

Pull #1

github

refactor: Track state via index, not input slice

This refactors the internal `State` management mechanism.

Previously, `State` tracked progress by slicing the input string
(`st.Input`).

Now, `State` retains the full original input string, and parsing
progress is tracked solely using `Location.Index`. This avoids
repeated string slicing and simplifies absolute location tracking.

*   Updates `State.advanceRune` to keep the full input.
*   Updates state consumers (`StringP`, `EOF`) to use the index.

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