[Feature] Support new parameter - EBNF in xgrammar (#2526)

python/sglang/srt/sampling/sampling_params.py

@@ -36,6 +36,7 @@ class SamplingParams:
         regex: Optional[str] = None,
         n: int = 1,
         json_schema: Optional[str] = None,
+        ebnf: Optional[str] = None,
         no_stop_trim: bool = False,
         ignore_eos: bool = False,
         skip_special_tokens: bool = True,
@@ -60,6 +61,7 @@ class SamplingParams:
         self.regex = regex
         self.n = n
         self.json_schema = json_schema
+        self.ebnf = ebnf
         self.no_stop_trim = no_stop_trim
 
         # Process some special cases
@@ -111,8 +113,13 @@ class SamplingParams:
                     f"min_new_tokens must be in (0, max_new_tokens({self.max_new_tokens})], got "
                     f"{self.min_new_tokens}."
                 )
-        if self.regex is not None and self.json_schema is not None:
-            raise ValueError("regex and json_schema cannot be both set.")
+        grammars = [
+            self.json_schema,
+            self.regex,
+            self.ebnf,
+        ]  # since mutually exclusive, only one can be set
+        if sum(x is not None for x in grammars) > 1:
+            raise ValueError("Only one of regex, json_schema, or ebnf can be set.")
 
     def normalize(self, tokenizer):
         # Process stop strings