feat(cdlEventHandler): detect TOGGLE Off and emit *_defined globals

Record parameters marked with "TOGGLE Off" by adding an optional
toggleOffParameterNames field and including an extra <var>_defined global
for each such parameter in createCdlEventHandlerSnippet.

To support this, the parser was changed from a brace-delta approach to a
token-based scanner so nesting and the association between a PARAM and its
TOGGLE can be tracked reliably. Added unit tests that verify detection,
case-insensitivity, and ignoring TOGGLE occurrences inside comments/strings
or other events.

client/src/common/cdlEventHandler.ts

@@ -1,6 +1,7 @@
 export interface CdlEventHandler {
     eventName: string
     parameterNames: string[]
+    toggleOffParameterNames?: string[]
 }
 
 function structuralCode(line: string): string {
@@ -33,18 +34,6 @@ function structuralCode(line: string): string {
     return result
 }
 
-function braceDelta(line: string): number {
-    let delta = 0
-    for (const character of structuralCode(line)) {
-        if (character === "{") {
-            delta += 1
-        } else if (character === "}") {
-            delta -= 1
-        }
-    }
-    return delta
-}
-
 export function cdlEventHandlerAtLine(
     source: string,
     declarationLine: number
@@ -61,35 +50,44 @@ export function cdlEventHandlerAtLine(
     }
 
     const parameterNames: string[] = []
+    const toggleOffParameterNames: string[] = []
+    let currentParameter: string | undefined
     let eventOpened = false
     let depth = 0
 
-    for (let lineNumber = declarationLine; lineNumber < lines.length; lineNumber++) {
+    eventLines: for (let lineNumber = declarationLine; lineNumber < lines.length; lineNumber++) {
         const line = lines[lineNumber]
         const code = structuralCode(line)
 
-        if (eventOpened && depth === 1) {
-            const parameterMatch = /^\s*PARAM\s+([^\s{]+)/.exec(code)
-            if (parameterMatch) {
-                parameterNames.push(parameterMatch[1])
-            }
-        }
-
-        const delta = braceDelta(line)
-        if (!eventOpened && delta > 0) {
-            eventOpened = true
-        }
-        if (eventOpened) {
-            depth += delta
-            if (depth <= 0) {
-                break
+        const tokens = code.match(/[{}]|[^\s{}]+/g) ?? []
+        for (let index = 0; index < tokens.length; index++) {
+            const token = tokens[index]
+            if (token === "{") {
+                eventOpened = true
+                depth++
+            } else if (token === "}" && eventOpened) {
+                depth--
+                if (depth === 1) currentParameter = undefined
+                if (depth <= 0) break eventLines
+            } else if (depth === 1 && token === "PARAM") {
+                const name = tokens[index + 1]
+                if (name && name !== "{" && name !== "}") {
+                    currentParameter = name
+                    parameterNames.push(name)
+                    index++
+                }
+            } else if (depth === 2 && currentParameter && token === "TOGGLE") {
+                if (tokens[index + 1]?.toLowerCase() === "off") {
+                    toggleOffParameterNames.push(currentParameter)
+                }
             }
         }
     }
 
     return {
         eventName: eventMatch[1],
-        parameterNames
+        parameterNames,
+        toggleOffParameterNames
     }
 }
 
@@ -102,8 +100,12 @@ function momVariableName(parameterName: string): string {
 }
 
 export function createCdlEventHandlerSnippet(handler: CdlEventHandler): string {
+    const toggleOffParameters = new Set(handler.toggleOffParameterNames ?? [])
     const globals = [
-        ...new Set(handler.parameterNames.map((parameter) => momVariableName(parameter)))
+        ...new Set(handler.parameterNames.flatMap((parameter) => {
+            const variable = momVariableName(parameter)
+            return toggleOffParameters.has(parameter) ? [variable, `${variable}_defined`] : [variable]
+        }))
     ]
     const lines = [`proc ${momEventName(handler.eventName)} {args} {`]