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typeDefs.js
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typeDefs.js
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/**
* Types to include as types.js.
*/
export default typeDefs = {
State: {
type: 'struct',
fields: {
canvasExpressions: 'IMap<number, CanvasExpression>',
nextExprId: 'number',
canvasDefinitions: 'IMap<string, CanvasPoint>',
definitions: 'IMap<string, ?UserExpression>',
// Evaluated expressions that haven't been measured yet. We need to
// measure them before we know where to place them.
pendingResults: 'IMap<number, PendingResult>',
// Map from finger ID to expression ID.
activeDrags: 'IMap<number, DragData>',
// Map from finger ID to the point where the canvas is being held.
// For now, the map has at most one finger ID.
activePan: 'IMap<number, CanvasPoint>',
// The canvas position of the screen origin.
panOffset: 'CanvasPoint',
highlightedExprs: 'ISet<ExprPath>',
// Set of lambda expressions where the body should be highlighted.
highlightedEmptyBodies: 'ISet<ExprPath>',
// Set of definition names where the definition body should be
// highlighted.
highlightedDefinitionBodies: 'ISet<string>',
isDeleteBarHighlighted: 'boolean',
paletteState: "'none' | 'lambda' | 'definition'",
isAutomaticNumbersEnabled: 'boolean',
},
},
Action: {
type: 'union',
cases: {
/**
* Clear the state. Useful for testing.
*/
Reset: {},
ToggleLambdaPalette: {},
ToggleDefinitionPalette: {},
/**
* Create a new expression at the given position.
*/
AddExpression: {
canvasExpr: 'CanvasExpression',
},
// Create the given definition, or add it and move it to the given
// place on the screen.
PlaceDefinition: {
defName: 'string',
screenPos: 'ScreenPoint',
},
// Remvoe the definition both from the screen and from the saved
// list of definitions.
DeleteDefinition: {
defName: 'string',
},
/**
* Move the existing expression on the canvas to a new point.
*/
MoveExpression: {
exprId: 'number',
pos: 'CanvasPoint',
},
/**
* Given an expression path, which must reference either a lambda
* with a body or a function call, remove the body or the call
* argument, and create a new expression from it at the given
* coordinates.
*/
// TODO: Get rid of this, maybe. Or make namespacing better.
DecomposeExpressionAction: {
path: 'ExprPath',
targetPos: 'CanvasPoint',
},
InsertAsArg: {
argExprId: 'number',
path: 'ExprPath',
},
InsertAsBody: {
bodyExprId: 'number',
path: 'ExprPath',
},
EvaluateExpression: {
exprId: 'number',
},
PlacePendingResult: {
exprId: 'number',
width: 'number',
height: 'number',
},
FingerDown: {
fingerId: 'number',
screenPos: 'ScreenPoint',
},
FingerMove: {
fingerId: 'number',
screenPos: 'ScreenPoint',
},
FingerUp: {
fingerId: 'number',
screenPos: 'ScreenPoint',
},
ToggleAutomaticNumbers: {},
},
},
Expression: {
type: 'union',
cases: {
Lambda: {
varName: 'string',
body: 'Expression',
},
FuncCall: {
func: 'Expression',
arg: 'Expression',
},
Variable: {
varName: 'string',
}
}
},
// Slots are mutable, so we just use a plain object definition.
Slot: {
type: 'literal',
value: `{
isValue: boolean,
expr: EvalExpression,
originalVarName: string
}`,
},
VarMarker: {
type: 'literal',
value: 'number',
},
EvalExpression: {
type: 'union',
cases: {
EvalLambda: {
varMarker: 'VarMarker',
originalVarName: 'string',
body: 'EvalExpression',
},
EvalFuncCall: {
func: 'EvalExpression',
arg: 'EvalExpression',
},
EvalBoundVariable: {
slot: 'Slot',
},
EvalUnboundVariable: {
varMarker: 'VarMarker',
originalVarName: 'string',
},
EvalFreeVariable: {
varName: 'string',
},
},
},
UserExpression: {
type: 'union',
cases: {
UserLambda: {
varName: 'string',
body: '?UserExpression'
},
UserFuncCall: {
func: 'UserExpression',
arg: 'UserExpression',
},
UserVariable: {
varName: 'string',
},
UserReference: {
defName: 'string',
},
},
},
CanvasExpression: {
type: 'struct',
fields: {
expr: 'UserExpression',
pos: 'CanvasPoint',
},
},
PendingResult: {
type: 'struct',
fields: {
expr: 'UserExpression',
sourceExprId: 'number',
}
},
// The state sent to React land to actually render. Ideally, any interesting
// logic should happen before this stage rather than in React components.
DisplayState: {
type: 'struct',
fields: {
screenExpressions: 'IList<ScreenExpression>',
screenDefinitions: 'IList<ScreenDefinition>',
paletteState: 'PaletteDisplayState',
measureRequests: 'IList<MeasureRequest>',
// Sorted array of all definition names.
definitionNames: 'IList<string>',
// Whether any drag is happening.
isDragging: 'boolean',
// Whether any of the dragged expressions are expressions. If only
// definitions are being dragged, then the delete bar shows "hide"
// rather than "remove".
isDraggingExpression: 'boolean',
isDeleteBarHighlighted: 'boolean',
isAutomaticNumbersEnabled: 'boolean',
},
},
PaletteDisplayState: {
type: 'struct',
fields: {
activePalette: "'none' | 'lambda' | 'definition'",
lambdas: 'IList<string>',
definitions: 'IList<string>',
},
},
MeasureRequest: {
type: 'struct',
fields: {
expr: 'DisplayExpression',
resultHandler: '(width: number, height: number) => void',
},
},
ScreenDefinition: {
type: 'struct',
fields: {
defName: 'string',
expr: '?DisplayExpression',
pos: 'ScreenPoint',
defKey: '?DefinitionKey',
refKey: '?DefinitionRefKey',
emptyBodyKey: '?DefinitionEmptyBodyKey',
shouldHighlightEmptyBody: 'boolean',
// A long-lived expression key to use as the React key.
key: 'string',
isDragging: 'boolean',
},
},
ScreenExpression: {
type: 'struct',
fields: {
expr: 'DisplayExpression',
pos: 'ScreenPoint',
// A long-lived expression key to use as the React key.
key: 'string',
isDragging: 'boolean',
// If null, don't show an execute button.
executeHandler: '?() => void',
},
},
DisplayExpression: {
type: 'union',
cases: {
DisplayLambda: {
exprKey: '?ViewKey',
shouldHighlight: 'boolean',
varKey: '?LambdaVarKey',
emptyBodyKey: '?EmptyBodyKey',
shouldHighlightEmptyBody: 'boolean',
varName: 'string',
body: '?DisplayExpression',
},
DisplayFuncCall: {
exprKey: '?ExpressionKey',
shouldHighlight: 'boolean',
func: 'DisplayExpression',
arg: 'DisplayExpression',
},
DisplayVariable: {
exprKey: '?ExpressionKey',
shouldHighlight: 'boolean',
varName: 'string',
},
DisplayReference: {
exprKey: '?ViewKey',
shouldHighlight: 'boolean',
shouldShowError: 'boolean',
defName: 'string',
}
},
},
CanvasPoint: {
type: 'struct',
mixinClass: 'CanvasPointMixin',
fields: {
canvasX: 'number',
canvasY: 'number',
},
},
PointDifference: {
type: 'struct',
mixinClass: 'PointDifferenceMixin',
fields: {
dx: 'number',
dy: 'number',
},
},
ScreenPoint: {
type: 'struct',
mixinClass: 'ScreenPointMixin',
fields: {
screenX: 'number',
screenY: 'number',
},
},
ScreenRect: {
type: 'struct',
mixinClass: 'ScreenRectMixin',
fields: {
topLeft: 'ScreenPoint',
bottomRight: 'ScreenPoint',
},
},
PathComponent: {
type: 'literal',
value: "'func' | 'arg' | 'body'",
},
ExprPath: {
type: 'struct',
fields: {
container: 'ExprContainer',
pathSteps: 'IList<PathComponent>',
}
},
// A possible starting point for an expression.
ExprContainer: {
type: 'union',
cases: {
ExprIdContainer: {
exprId: 'number',
},
DefinitionContainer: {
defName: 'string',
},
},
},
// The action to perform at the start of a drag operation.
DragResult: {
type: 'union',
cases: {
PickUpExpression: {
exprId: 'number',
offset: 'PointDifference',
screenRect: 'ScreenRect',
},
PickUpDefinition: {
defName: 'string',
offset: 'PointDifference',
screenRect: 'ScreenRect',
},
ExtractDefinition: {
defName: 'string',
offset: 'PointDifference',
screenRect: 'ScreenRect',
},
DecomposeExpression: {
exprPath: 'ExprPath',
offset: 'PointDifference',
screenRect: 'ScreenRect',
},
CreateExpression: {
expr: 'UserExpression',
offset: 'PointDifference',
screenRect: 'ScreenRect',
},
StartPan: {
startPos: 'ScreenPoint',
}
},
},
DragData: {
type: 'struct',
fields: {
payload: 'DragPayload',
// The coordinates of the grab position relative to the top-left of
// the screen rectangle.
grabOffset: 'PointDifference',
// The position of the dragged object on the screen.
screenRect: 'ScreenRect',
},
},
DragPayload: {
type: 'union',
cases: {
DraggedExpression: {
userExpr: 'UserExpression',
},
DraggedDefinition: {
defName: 'string',
},
},
},
// The action performed when dropping.
DropResult: {
type: 'union',
cases: {
AddToTopLevelResult: {
payload: 'DragPayload',
screenPos: 'ScreenPoint',
},
InsertAsBodyResult: {
lambdaPath: 'ExprPath',
expr: 'UserExpression',
},
InsertAsArgResult: {
path: 'ExprPath',
expr: 'UserExpression',
},
InsertAsDefinitionResult: {
defName: 'string',
expr: 'UserExpression',
},
RemoveResult: {},
RemoveWithDeleteBarResult: {},
},
},
// An identifier that can be used for any view in the dragging and dropping
// system. Components identify themselves as having these identifiers, and
// the rest of the world can work completely in terms of these identifiers
// when computing things like drop targets.
ViewKey: {
type: 'union',
cases: {
ExpressionKey: {
exprPath: 'ExprPath',
},
EmptyBodyKey: {
lambdaPath: 'ExprPath',
},
LambdaVarKey: {
lambdaPath: 'ExprPath',
},
DefinitionKey: {
defName: 'string',
},
DefinitionRefKey: {
defName: 'string',
},
DefinitionEmptyBodyKey: {
defName: 'string',
},
PaletteLambdaKey: {
varName: 'string',
},
PaletteReferenceKey: {
defName: 'string',
},
DeleteBarKey: {},
}
}
};