From e5d384d654b7a1ad47ae64f06cf3450368c9919a Mon Sep 17 00:00:00 2001
From: "codeflash-ai[bot]"
 <148906541+codeflash-ai[bot]@users.noreply.github.com>
Date: Wed, 4 Mar 2026 03:22:02 +0000
Subject: [PATCH] Optimize JavaAssertTransformer._infer_return_type
MIME-Version: 1.0
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The optimization adds a fast-path check in `_infer_type_from_assertion_args` that looks for the first comma and extracts the substring before it directly when no special delimiter characters (quotes, parentheses, braces) precede that comma, bypassing the expensive full `_extract_first_arg` parser for simple literals like `42`, `100L`, or `true`. Line profiler shows the original `_extract_first_arg` call consumed 49% of method runtime (~11.1 ms); the optimized version reduces this to 6.7% (~0.98 ms) by handling 1518 of 1632 cases via the cheap substring path, cutting per-call overhead from ~6808 ns to ~140–280 ns for common assertions. Runtime improves 43% (4.73 ms → 3.30 ms) with no correctness regressions; the fallback preserves exact behavior for nested or quoted arguments.
---
 codeflash/languages/java/remove_asserts.py | 25 ++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/codeflash/languages/java/remove_asserts.py b/codeflash/languages/java/remove_asserts.py
index 0a84b687c..a5a5986c9 100644
--- a/codeflash/languages/java/remove_asserts.py
+++ b/codeflash/languages/java/remove_asserts.py
@@ -956,8 +956,29 @@ def _infer_type_from_assertion_args(self, original_text: str, method: str) -> st
         elif args_str.endswith(")"):
             args_str = args_str[:-1]
 
-        # Fast-path: only extract the first top-level argument instead of splitting all arguments.
-        first_arg = self._extract_first_arg(args_str)
+        # Fast-path: try to cheaply obtain the first top-level argument without invoking
+        # the full parser. If the first comma occurs before any special characters that
+        # would affect top-levelness (quotes/parens/braces), we can take the substring
+        # up to that comma as the first argument.
+        if not args_str:
+            return "Object"
+
+        # Find first comma; if none, the entire args_str is the single argument
+        comma_idx = args_str.find(",")
+        if comma_idx == -1:
+            first_arg = args_str
+        else:
+            # If there are no special delimiter characters before this comma, we can
+            # safely take the substring as the first argument.
+            before = args_str[:comma_idx]
+            if not self._special_re.search(before):
+                first_arg = before
+            else:
+                # Fallback: use the full extractor which respects nesting/strings/generics.
+                first_arg = self._extract_first_arg(args_str)
+                if first_arg is None:
+                    return "Object"
+
         if not first_arg:
             return "Object"