Immutable parser (Tokenize borrow strings cont) #2098
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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.