fix: broken constants gen (#9387)

Fixes broken constants gen due to new formatting in noir.

yarn-project/circuits.js/src/scripts/constants.in.ts

@@ -322,7 +322,7 @@ function parseNoirFile(fileContent: string): ParsedContent {
     }
 
     {
-      const [, name, _type, value, end] = line.match(/global\s+(\w+)(\s*:\s*\w+)?\s*=\s*([^;]+)(;)?/) || [];
+      const [, name, _type, value, end] = line.match(/global\s+(\w+)(\s*:\s*\w+)?\s*=\s*([^;]*)(;)?/) || [];
       if (name && value) {
         const [, indexName] = name.match(/GENERATOR_INDEX__(\w+)/) || [];
         if (indexName) {
@@ -336,6 +336,10 @@ function parseNoirFile(fileContent: string): ParsedContent {
           expression = { name, content: [value] };
         }
         return;
+      } else if (name) {
+        // This case happens if we have only a name, with the value being on the next line
+        expression = { name, content: [] };
+        return;
       }
     }
 
@@ -389,8 +393,11 @@ function evaluateExpressions(expressions: [string, string][]): { [key: string]:
         // We make some space around the parentheses, so that constant numbers are still split.
         .replace(/\(/g, '( ')
         .replace(/\)/g, ' )')
+        // We also make some space around common operators
+        .replace(/\+/g, ' + ')
+        .replace(/(?<!\/)\*(?!\/)/, ' * ')
         // We split the expression into terms...
-        .split(' ')
+        .split(/\s+/)
         // ...and then we convert each term to a BigInt if it is a number.
         .map(term => (isNaN(+term) ? term : `BigInt('${term}')`))
         // .. also, we convert the known bigints to BigInts.