Module eval 

Evaluator: walks the crate::ast and produces a placed-primitive Drawing using pic’s positioning semantics.

Model (Kernighan §3): a pen with a current position and current direction walks the plane dropping primitives. Closed objects (box/circle/ ellipse/block) attach at the current point and advance by their extent; open objects (line/arrow/move/spline/arc) trace from the current point in the current direction. Labels, compass corners and ordinals (last/nth) resolve against previously placed objects.

Approximations (documented; refined later): arc renders a default quarter turn.

Structs

EvalError

An evaluation error. info carries the structured diagnostic when the failure site had one at hand (a deferred-parse error’s full Diagnostic, or a place reference’s span); bindings surface it without re-deriving positions from the message.

EvalLimits

Constants

DEFAULT_MAX_ANIMATION_REPEAT

DEFAULT_MAX_ANIMATION_SECONDS

DEFAULT_MAX_LOOP_ITERATIONS

DEFAULT_MAX_SHAPES

Functions

eval

Evaluate a parsed picture into a Drawing.

eval_with_limits

Evaluate a parsed picture with host-provided resource limits.