add transition label parser

src/VisualEditor/VisualEditor.css

@@ -116,7 +116,7 @@ line.selected, circle.selected {
 
 text.selected, text.selected:hover {
   fill: blue;
-  /* font-weight: bold; */
+  font-weight: 600;
 }
 text:hover {
   fill: darkcyan;
@@ -125,12 +125,13 @@ text:hover {
 
 .highlight {
   stroke: green;
-  stroke-width: 4px;
+  stroke-width: 3px;
 }
 
 .arrow.error {
   stroke: rgb(230,0,0);
 }
-text.error {
+text.error, tspan.error {
   fill: rgb(230,0,0);
+  font-weight: 600;
 }

src/VisualEditor/VisualEditor.tsx

@@ -470,11 +470,34 @@ export function VisualEditor() {
       />
     )}
 
-    {state.texts.map(txt => <text
+    {state.texts.map(txt => {
+      const err = errors.find(([uid]) => txt.uid === uid)?.[1];
+      let markedText;
+      if (err) {
+        const {start,end} = err.location;
+        markedText = <>
+          {txt.text.slice(0, start.offset)}
+          <tspan className="error" data-uid={txt.uid} data-parts="text">
+            {txt.text.slice(start.offset, end.offset)}
+          </tspan>
+          {txt.text.slice(end.offset)}
+        </>;
+      }
+      else {
+        markedText = <>{txt.text}</>;
+      }
+      // const annotatedText = err ? [...txt.text].map((char,i) => {
+      //   if (i >= err.location.start.offset && i < err.location.end.offset) {
+      //     return char+'\u0332';
+      //   }
+      //   return char;
+      // }).join('') : txt.text;
+      return <text
         key={txt.uid}
         className={
           (selection.find(s => s.uid === txt.uid)?.parts?.length ? "selected":"")
           +(textsToHighlight.hasOwnProperty(txt.uid)?" highlight":"")
+          // +(errors.some(([uid]) => uid === txt.uid)?" error":"")
         }
         x={txt.topLeft.x}
         y={txt.topLeft.y}
@@ -501,8 +524,8 @@ export function VisualEditor() {
           }
         }}
       >
-      {txt.text}
-    </text>)}
+        {markedText}
+      </text>;})}
 
     {selectingState && <Selecting {...selectingState} />}
 
@@ -648,7 +671,9 @@ export function RountangleSVG(props: {rountangle: Rountangle, selected: string[]
       data-uid={uid}
       data-parts="bottom left"
       />
-    <text x={10} y={20}>{uid}</text>
+    <text x={10} y={20}
+      data-uid={uid}
+      data-parts="left top right bottom">{uid}</text>
   </g>;
 }
 

src/VisualEditor/ast.ts

@@ -1,3 +1,5 @@
+import { TransitionLabel } from "./label_ast";
+
 export type AbstractState = {
   uid: string;
   children: ConcreteState[];
@@ -20,37 +22,9 @@ export type Transition = {
   uid: string;
   src: ConcreteState;
   tgt: ConcreteState;
-  trigger: Trigger;
-  guard: Expression;
-  actions: Action[];
+  label: TransitionLabel[];
 }
 
-export type EventTrigger = {
-  kind: "event";
-  event: string;
-}
-
-export type AfterTrigger = {
-  kind: "after";
-  delay_ms: number;
-}
-
-export type Trigger = EventTrigger | AfterTrigger;
-
-export type RaiseEvent = {
-  kind: "raise";
-  event: string;
-}
-
-export type Assign = {
-  lhs: string;
-  rhs: Expression;
-}
-
-export type Expression = {};
-
-export type Action = RaiseEvent | Assign;
-
 export type Statechart = {
   root: ConcreteState;
   transitions: Map<string, Transition[]>; // key: source state uid

src/VisualEditor/label_ast.ts

@@ -0,0 +1,53 @@
+export type TransitionLabel = {
+  trigger: Trigger;
+  guard: Expression;
+  actions: Action[];
+}
+
+
+export type Trigger = EventTrigger | AfterTrigger;
+
+export type EventTrigger = {
+  kind: "event";
+  event: string;
+}
+
+export type AfterTrigger = {
+  kind: "after";
+  durationMs: number;
+}
+
+
+export type Action = Assignment | RaiseEvent;
+
+export type Assignment = {
+  kind: "assignment";
+  lhs: string;
+  rhs: Expression;
+}
+
+export type RaiseEvent = {
+  kind: "raise";
+  event: string;
+}
+
+
+export type Expression = BinaryExpression | UnaryExpression | VarRef;
+
+export type BinaryExpression = {
+  kind: "binaryExpr";
+  operator: "+" | "-" | "*" | "/" | "&&" | "||";
+  lhs: Expression;
+  rhs: Expression;
+}
+
+export type UnaryExpression = {
+  kind: "unaryExpr";
+  operator: "!" | "-";
+  expr: Expression;
+}
+
+export type VarRef = {
+  kind: "ref";
+  variable: string;
+}

src/VisualEditor/parser.ts

@@ -1,8 +1,13 @@
 import { ConcreteState, OrState, Statechart, Transition } from "./ast";
-import { findNearestRountangleSide, Rountangle, VisualEditorState } from "./editor_types";
+import { findNearestArrow, findNearestRountangleSide, Rountangle, VisualEditorState } from "./editor_types";
 import { isEntirelyWithin } from "./geometry";
+import { TransitionLabel } from "./label_ast";
+
+import { parse as parseLabel } from "./label_parser";
 
 export function parseStatechart(state: VisualEditorState): [Statechart, [string,string][]] {
+  const errorShapes: [string, string][] = [];
+
   // implicitly, the root is always an Or-state
   const root: OrState = {
     kind: "or",
@@ -23,6 +28,8 @@ export function parseStatechart(state: VisualEditorState): [Statechart, [string,
 
   const parentLinks = new Map<string, string>();
 
+  // step 1: figure out state hierarchy
+
   // we assume that the rountangles are sorted from big to small:
   for (const rt of state.rountangles) {
     const state: ConcreteState = {
@@ -49,9 +56,10 @@ export function parseStatechart(state: VisualEditorState): [Statechart, [string,
     }
   }
 
-  const transitions = new Map<string, Transition[]>();
+  // step 2: figure out transitions
 
-  const errorShapes: [string, string][] = [];
+  const transitions = new Map<string, Transition[]>();
+  const uid2Transition = new Map<string, Transition>();
 
   for (const arr of state.arrows) {
     const srcUID = findNearestRountangleSide(arr, "start", state.rountangles)?.uid;
@@ -84,15 +92,12 @@ export function parseStatechart(state: VisualEditorState): [Statechart, [string,
           uid: arr.uid,
           src: uid2State.get(srcUID)!,
           tgt: uid2State.get(tgtUID)!,
-          trigger: {
-            kind: "?",
-          },
-          guard: {},
-          actions: [],
+          label: [],
         };
         const existingTransitions = transitions.get(srcUID) || [];
         existingTransitions.push(transition);
         transitions.set(srcUID, existingTransitions);
+        uid2Transition.set(arr.uid, transition);
       }
     }
   }
@@ -108,6 +113,36 @@ export function parseStatechart(state: VisualEditorState): [Statechart, [string,
     }
   }
 
+  // step 3: figure out labels
+
+  for (const text of state.texts) {
+    const belongsToArrow = findNearestArrow(text.topLeft, state.arrows);
+    if (belongsToArrow) {
+      const belongsToTransition = uid2Transition.get(belongsToArrow.uid);
+      if (belongsToTransition) {
+        // parse as transition label
+        let transitionLabel: TransitionLabel;
+        try {
+          transitionLabel = parseLabel(text.text); // may throw
+          belongsToTransition.label.push(transitionLabel);
+        }
+        catch (e) {
+          console.log({e});
+          errorShapes.push([text.uid, e]);
+        }
+      }
+    }
+  }
+
+  for (const transition of uid2Transition.values()) {
+    if (transition.label.length === 0) {
+      errorShapes.push([transition.uid, "no label"]);
+    }
+    else if (transition.label.length > 1) {
+      errorShapes.push([transition.uid, "multiple labels"]);
+    }
+  }
+
   return [{
     root,
     transitions,

src/VisualEditor/transition_label.grammar

@@ -0,0 +1,95 @@
+start = _ trigger:trigger _ guard:("[" _ guard _ "]")? _ actions:("/" _ actions )? _ {
+	return {
+    	trigger,
+        guard: guard ? guard[2] : {kind: "literal", value: true},
+        actions: actions ? actions[2] : [],
+    };
+}
+
+trigger = afterTrigger / eventTrigger
+
+eventTrigger = event:identifier {
+	return {kind: "event", event};
+}
+
+afterTrigger = "after" _ dur:durationMs {
+	return {kind: "after", durationMs: dur};
+}
+
+durationMs = num:number _ u:timeUnit {
+	return num * (u === "s" ? 1000 : 1);
+}
+
+timeUnit = "ms" / "s" {
+	return text();
+}
+
+guard = expr
+
+actions = head:action tail:(_ ";" _ action)* _ ";"? {
+	return [head, ...tail.map(t => t[3])];
+}
+action = assignment / raise
+
+assignment = lhs:identifier _ "=" _ rhs:expr {
+	return {kind: "assignment", lhs, rhs};
+}
+
+identifier = [a-zA-Z0-9]+ {
+	return text();
+}
+
+number = [0-9]+ {
+	return parseInt(text());
+}
+
+_ "whitespace"
+  = [ \t\n\r]*
+  
+expr = sum
+
+sum = prod:product rest:((_ ("+" / "-") _) sum)? {
+	if (rest === null) {
+    	return prod;
+    }
+    return {
+        kind:"binaryExpr",
+        operator: rest[0][1],
+        lhs: prod,
+        rhs: rest[1],
+    };
+}
+
+product = atom:atom rest:((_ ("*" / "/") _) product)? {
+	if (rest === null) {
+    	return atom;
+    }
+    return {
+        kind:"binaryExpr",
+        operator: rest[0][1],
+        lhs: atom,
+        rhs: rest[1],
+    };
+}
+
+atom = nested / literal / ref
+
+nested = "(" _ expr:expr _ ")" {
+	return expr;
+}
+
+literal = value:(number / boolean) {
+	return {kind: "literal", value}
+}
+
+ref = variable:identifier {
+	return {kind: "ref", variable}
+}
+
+boolean = ("true" / "false") {
+	return text() === "true";
+}
+
+raise = "^" _ event:identifier {
+	return {kind: "raise", event};
+}

src/index.css

@@ -1,6 +1,7 @@
 html, body {
   margin: 0;
   height: 100%;
+  font-family: Roboto, sans-serif;
 }
 
 div#root {