From 2be21c5453a402e3bc371871264ccafe99ea9c75 Mon Sep 17 00:00:00 2001
From: Andrew Noyes <andrew@weaselab.dev>
Date: Fri, 20 Jun 2025 14:33:37 -0400
Subject: [PATCH] Avoid pushing N_NUMBER on the stack if possible

---
 src/parser3.h | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/parser3.h b/src/parser3.h
index 2902d3b..195892f 100644
--- a/src/parser3.h
+++ b/src/parser3.h
@@ -508,9 +508,18 @@ inline PRESERVE_NONE WeaselJsonStatus n_value(Parser3 *self, char *buf,
     self->dataBegin = buf;
     self->pop();
     self->numDfa.reset();
-    if (auto s = self->push({N_NUMBER})) {
-      return s;
+    buf = (char *)self->numDfa.scan(buf, bufEnd);
+    if (buf == bufEnd) {
+      self->flushNumber(false, buf);
+      if (auto s = self->push({N_NUMBER})) {
+        return s;
+      }
+      return WeaselJson_AGAIN;
     }
+    if (!self->numDfa.accept()) [[unlikely]] {
+      return WeaselJson_REJECT;
+    }
+    self->flushNumber(true, buf);
     MUSTTAIL return Parser3::keepGoing(self, buf, bufEnd);
   case 't':
     ++buf;