[Auto Sync] Update base_grammar_backend.py, xgrammar_backen... (20250930) (#11115)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Sehoon Kim <sehoon@x.ai>

python/sglang/srt/constrained/base_grammar_backend.py

@@ -35,6 +35,7 @@ class GrammarStats:
     is_cache_hit: bool = False
     is_grammar_aborted: bool = False
     tree_traversal_time: List[float] = field(default_factory=list)
+    dispatch_type: Optional[str] = None
 
 
 class BaseGrammarObject:

python/sglang/srt/constrained/xgrammar_backend.py

@@ -217,7 +217,7 @@ class XGrammarGrammarBackend(BaseGrammarBackend):
         except (RuntimeError, json.decoder.JSONDecodeError) as e:
             logging.error(f"Hit invalid json_schema: {key_string=}, {e=}")
             return INVALID_GRAMMAR_OBJ
-        return self._from_context(ctx, key_string, GrammarStats())
+        return self._from_context(ctx, key_string, GrammarStats(dispatch_type="json"))
 
     def dispatch_ebnf(self, key_string: str) -> Optional[XGrammarGrammar]:
         try:
@@ -225,7 +225,7 @@ class XGrammarGrammarBackend(BaseGrammarBackend):
         except RuntimeError as e:
             logging.error(f"Hit invalid ebnf: {key_string=}, {e=}")
             return INVALID_GRAMMAR_OBJ
-        return self._from_context(ctx, key_string, GrammarStats())
+        return self._from_context(ctx, key_string, GrammarStats(dispatch_type="ebnf"))
 
     def dispatch_regex(self, key_string: str) -> Optional[XGrammarGrammar]:
         try:
@@ -233,7 +233,7 @@ class XGrammarGrammarBackend(BaseGrammarBackend):
         except RuntimeError as e:
             logging.error(f"Hit invalid regex: {key_string=}, {e=}")
             return INVALID_GRAMMAR_OBJ
-        return self._from_context(ctx, key_string, GrammarStats())
+        return self._from_context(ctx, key_string, GrammarStats(dispatch_type="regex"))
 
     def dispatch_structural_tag(self, key_string: str) -> Optional[XGrammarGrammar]:
         try:
@@ -252,7 +252,9 @@ class XGrammarGrammarBackend(BaseGrammarBackend):
         except (RuntimeError, json.decoder.JSONDecodeError) as e:
             logging.error(f"Hit invalid structural_tag: {key_string=}, {e=}")
             return INVALID_GRAMMAR_OBJ
-        return self._from_context(ctx, key_string, GrammarStats())
+        return self._from_context(
+            ctx, key_string, GrammarStats(dispatch_type="structural_tag")
+        )
 
     def reset(self):
         self.grammar_compiler.clear_cache()