Module eval 

Interpreter state and beta-reduction.

Expression evaluation lives entirely in crate::compile; what remains here is genuinely runtime: the Interp state every primitive threads (images, hooks, cross-references, decorations, …), function application, and pattern matching. Follows evaluator.cppo.ml’s naive interpreter, not its bytecode VM, which was deliberately not ported.

Structs

EvalError

Interp

Evaluation state threaded through every primitive: font metrics, images, hooks, cross-references, and the per-trial accumulators below.

Enums

DecoEntry

See Interp::decos.

FirePass

Which callbacks a walk over placed geometry (crate::fire_hooks and the helpers it shares with page_break_core) is allowed to invoke.

Functions

match_pattern

Structural pattern matching against an already-evaluated scrutinee. Returns true (and appends every bound value, POSITIONALLY, in the order they were encountered) on a structural match; returns false (leaving bindings for this attempt unusable — callers must use a fresh Vec per arm) otherwise.