Immutable parser (Tokenize borrow strings cont) #2098
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Key points for this commit: - The peekable trait isn't sufficient for using string slices, as we need the byte indexes (start/end) to create string slices, so added the current byte position to the State struct (Note: in the long term we could potentially remove peekable and use only the current position as an iterator) - Created internal functions that create slices from the original query instead of allocating strings, then converted these functions to return String to maintain compatibility (the idea is to make a small, reviewable commit without changing the Token struct or the parser)
Add internal _borrowed() functions that return Cow<\'a, str> to prepare for zero-copy tokenization. When the source string needs no transformation (no escaping), return Cow::Borrowed. When transformation is required, return Cow::Owned. The Token enum still uses String, so borrowed values are converted via to_owned() for now. This maintains API compatibility while preparing the codebase for a future refactor where Token can hold borrowed strings. Optimized: comments, quoted strings, dollar-quoted strings, quoted identifiers.
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Changed all parsing methods to take '&self' instead of '\&mut self'. Mutable parser state (token index and parser state) now uses for interior mutability. This refactoring is preparation for the borrowed tokenizer work. When holding borrowed tokens from the parser (with lifetime tied to '\&self'), we cannot call methods requiring '\&mut self' due to Rust's borrowing rules. Using interior mutability resolves this conflict by allowing state mutations through shared references.
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refactor: Make Parser methods immutable using interior mutability
Changed all parsing methods to take
&selfinstead of&mut self.Mutable parser state (token index and parser state) now uses
Cellfor interior mutability.
This refactoring is preparation for the borrowed tokenizer work. When
holding borrowed tokens from the parser (with lifetime tied to
&self),we cannot call methods requiring
&mut selfdue to Rust's borrowingrules. Using interior mutability resolves this conflict by allowing
state mutations through shared references.