Module syntax 

Syntax: per-document tree-sitter state.

Owns a tree_sitter::Parser + the latest cached Tree plus a shared crate::LangRegistry for the document’s primary language and any injection targets. The hand-rolled native pipeline runs highlights.scm directly via tree_sitter::QueryCursor, walks each match into per-line StyledSpans, and recursively highlights ranges captured by injections.scm.

Reparse

Two entry points (slice B.2):

• Syntax::parse_at: full reparse. Used for cold-start / file-load / fallback. Parser::parse(bytes, None).
• Syntax::parse_at_with_edits: incremental reparse. Applies each EditDelta to the cached tree via tree.edit() then Parser::parse(bytes, Some(&old_tree)), so tree-sitter reuses unchanged subtrees. Falls back to full reparse if any guard fails (no cached tree, from_version mismatch, or post-edit byte-length mismatch between accumulated deltas and new source).

Both methods stamp the resulting snapshot with a caller- supplied text_version so consumers (renderer / fold provider / completion) can compare freshness against DocumentSnapshot::text_version.

Injections

Markdown’s grammar is split block / inline; the block parser’s injections.scm injects the inline parser into paragraph content and the named language parser into fenced code blocks. Our injection callback (in highlight_lines) closes over the shared registry and looks up sibling configs by name – so a ```rust ... ``` block in a markdown buffer gets rust highlighting, an autolink in a paragraph gets inline-markdown highlighting, etc.

Structs

Syntax

SyntaxSnapshot

Read-only view of one parse result.

Enums

SyntaxError

Functions

edit_delta_to_input_edit

Convert a [lattice_protocol::edit::EditDelta] (parser-agnostic edit shape) to a [tree_sitter::InputEdit] (parser-shaped edit the cached tree mutates by). Six casts + a struct constructor; runs in the noise floor (~1ns).