perf: inline getStructNameRange into getStructNameFromType

getStructNameRange searches bounds of type name, but to do this it
returns array of 2 elements: start + end. But as it invoked oftenly this
can create lots of intermediate arrays and waste memory.

This function was inlined into getStructNameFromType and now
substituteStructName just invokes getStructNameFromType and then
'replace' with given typename. This is more optimal, because
substituteStructName invoked more rare that first.

Author: ashenBlade

src/utils.ts

@@ -20,8 +20,8 @@ export function isValidIdentifier(value: string) {
     return identifierRegex.test(value);
 }
 
-/* Get start-end indexes range for given type */
-function getStructNameRange(type: string) {
+export function getStructNameFromType(type: string) {
+    /* [const] [struct] NAME [*]+ */
     /*
      * Start locating from end, because we can use '*' as the boundary of
      * typename end.
@@ -71,13 +71,7 @@ function getStructNameRange(type: string) {
         startOfIndentifier++;
     }
 
-    return [startOfIndentifier, endOfIdentifier + 1] as const;
-}
-
-export function getStructNameFromType(type: string) {
-    /* [const] [struct] NAME [*]+ */
-    const [start, end] = getStructNameRange(type);
-    return type.substring(start, end);
+    return type.substring(startOfIndentifier, endOfIdentifier + 1);
 }
 
 /**
@@ -89,19 +83,8 @@ export function getStructNameFromType(type: string) {
  * @returns Result type name
  */
 export function substituteStructName(type: string, target: string) {
-    const [start, end] = getStructNameRange(type);
-    
-    /* Add some optimized paths to reduce number of allocations */
-    if (start === 0) {
-        return `${target}${type.substring(end)}`;
-    }
-    
-    if (end === type.length) {
-        return `${type.substring(0, start)}${target}`;
-    }
-    
-    return `${type.substring(0, start)}${target}${type.substring(end)}`;
-}
+    const typename = getStructNameFromType(type);
+    return type.replace(typename, target);}
 
 /*
  * Check that 'type' contains exact count of pointers in it