Avoid temporary substr in Parser::match

Made-with: Cursor

Author: tegaidogun

src/core/parser.cpp

@@ -313,8 +313,9 @@ char Parser::consume() {
     return m_input[m_position++];
 }
 
+// Match a literal string at the current position without allocating a temporary substring.
 bool Parser::match(const std::string& str) {
-    if (m_input.substr(m_position, str.length()) == str) {
+    if (m_input.compare(m_position, str.length(), str) == 0) {
         m_position += str.length();
         return true;
     }