Crate dotloom_engine 

dotloom-engine

The headless Dotloom engine. It owns the only editable copy of a document and runs every change through one pipeline:

commands → working overlay → structural validation → solve (affected component)
         → independent hard-rule check → atomic commit → revision + events

A failed transaction leaves the document untouched. Undo/redo apply stored before/after states without re-solving. Drags produce transient previews and a single history entry. Plugin entity types are data (EntityTypeDef) compiled from a typed expression language; no host code runs inside the solver.

The engine has no DOM, window or GPU dependency.

Re-exports

pub use registry::EntityTypeDef;

pub use registry::Registry;

pub use registry::RegistryError;

pub use dotloom_constraints as constraints;

pub use dotloom_document as document;

pub use dotloom_geometry as geometry;

pub use dotloom_scene as scene;

Modules

eval

Numeric evaluation of entities: world anchors, drawable shapes and texts.

lang

The Dotloom expression language used by plugin model definitions.

registry

Entity type definitions and the type registry (ADR-0006).

Structs

ApplyOptions

Options of a single request.

CommitReport

Successful commit.

ConstraintPatch

Partial constraint update.

ConstraintSpec

Constraint content (the engine assigns or validates the ID).

DiagnosticReport

A solver diagnostic mapped back to document objects.

DragPreview

Result of a drag update.

Engine

The Dotloom engine.

EngineOptions

Engine configuration.

EntityPatch

Partial update of an entity. props entries set to null remove the property.

Hit

A hit.

LayerPatch

Layer update.

NearestValue

Nearest feasible value for an edit that could not be satisfied.

NewEntity

Data for a new entity.

Overlay

Copy-on-write overlay over a document used while a transaction runs.

ParamValue

A numeric parameter assignment.

SettingsPatch

Settings update.

Snap

A snap result.

SnapOptions

Snap options.

SnapQuery

A snap query.

SolveFailure

Why solving rejected a transaction.

SolverStats

What the solver did for a commit (diagnostics and performance work).

Transaction

A group of commands applied atomically.

Enums

Command

One command of a transaction.

CommandError

Command errors (the transaction is rejected, nothing changes).

DeletePolicy

What to do with constraints and referencing entities when deleting.

DragSpec

What is dragged.

EditMode

How numeric edits are applied.

EngineError

Engine errors. A failed request never changes the document.

Event

Engine event, emitted after state changes (never during a commit).

PendingState

Progress of a pending commit.

SelectMode

Area selection mode.

SnapKind

Snap kinds in priority order.

Constants

THEME_DEFAULT

Theme-default color marker.

Traits

DocView

Read-only view of document content.

Functions

migrate_entities

Upgrade plugin entities whose type_version is older than the registered definition, applying the definition’s migration steps in order. Entities written by a newer version are left untouched (they evaluate as read-only).