diff --git a/pkg/functions/bnf_rules.go b/pkg/functions/bnf_rules.go
new file mode 100644
index 00000000..13aa3654
--- /dev/null
+++ b/pkg/functions/bnf_rules.go
@@ -0,0 +1,47 @@
+package functions
+
+import "regexp"
+
+var (
+	PRIMITIVE_RULES = map[string]string{
+		"boolean": `("true" | "false") space`,
+		"number":  `("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? space`,
+		"integer": `("-"? ([0-9] | [1-9] [0-9]*)) space`,
+		"string": `"\"" (
+			[^"\\] |
+			"\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F])
+		  )* "\"" space`,
+		// TODO: we shouldn't forbid \" and \\ or all unicode and have this branch here,
+		// however, if we don't have it, the grammar will be ambiguous and
+		// empirically results are way worse.
+		"freestring": `(
+			[^\x00] |
+			"\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F])
+		  )* space`,
+		"null": `"null" space`,
+	}
+
+	INVALID_RULE_CHARS_RE     = regexp.MustCompile(`[^a-zA-Z0-9-]+`)
+	GRAMMAR_LITERAL_ESCAPE_RE = regexp.MustCompile(`[\r\n"]`)
+	GRAMMAR_LITERAL_ESCAPES   = map[string]string{
+		"\r": `\r`,
+		"\n": `\n`,
+		`"`:  `\"`,
+	}
+)
+
+const (
+	SPACE_RULE = `" "?`
+
+	arrayNewLines = `arr  ::=
+  "[\n"  (
+		realvalue
+    (",\n"  realvalue)*
+  )? "]"`
+
+	array = `arr  ::=
+  "["  (
+		realvalue
+    (","  realvalue)*
+  )? "]"`
+)
diff --git a/pkg/functions/function_structure.go b/pkg/functions/function_structure.go
new file mode 100644
index 00000000..650236ec
--- /dev/null
+++ b/pkg/functions/function_structure.go
@@ -0,0 +1,22 @@
+package functions
+
+import "encoding/json"
+
+type Item struct {
+	Type       string                 `json:"type"`
+	Properties map[string]interface{} `json:"properties"`
+}
+
+type JSONFunctionStructure struct {
+	OneOf []Item                 `json:"oneOf,omitempty"`
+	AnyOf []Item                 `json:"anyOf,omitempty"`
+	Defs  map[string]interface{} `json:"$defs,omitempty"`
+}
+
+func (j JSONFunctionStructure) Grammar(options ...func(*GrammarOption)) string {
+	grammarOpts := &GrammarOption{}
+	grammarOpts.Apply(options...)
+
+	dat, _ := json.Marshal(j)
+	return NewJSONSchemaConverter(grammarOpts.PropOrder).GrammarFromBytes(dat, options...)
+}
diff --git a/pkg/functions/functions.go b/pkg/functions/functions.go
index 49e9fc93..4f97f409 100644
--- a/pkg/functions/functions.go
+++ b/pkg/functions/functions.go
@@ -18,6 +18,15 @@ type Function struct {
 }
 type Functions []Function
 
+type FunctionName struct {
+	Const string `json:"const"`
+}
+
+type Argument struct {
+	Type       string                 `json:"type"`
+	Properties map[string]interface{} `json:"properties"`
+}
+
 type Tool struct {
 	Type     string   `json:"type"`
 	Function Function `json:"function,omitempty"`
@@ -86,3 +95,8 @@ func (f Functions) Select(name string) Functions {
 
 	return funcs
 }
+
+func jsonString(v interface{}) string {
+	b, _ := json.Marshal(v)
+	return string(b)
+}
diff --git a/pkg/functions/functions_suite_test.go b/pkg/functions/functions_suite_test.go
index 8964b1c8..59a90ab0 100644
--- a/pkg/functions/functions_suite_test.go
+++ b/pkg/functions/functions_suite_test.go
@@ -1,8 +1,10 @@
-package functions
+package functions_test
 
 import (
 	"testing"
 
+	. "github.com/mudler/LocalAI/pkg/functions"
+
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
 )
@@ -11,3 +13,13 @@ func TestGrammar(t *testing.T) {
 	RegisterFailHandler(Fail)
 	RunSpecs(t, "Grammar test suite")
 }
+
+func createFunction(field1 string, field2 string, name string, properties map[string]interface{}) map[string]interface{} {
+	property := map[string]interface{}{}
+	property[field1] = FunctionName{Const: name}
+	property[field2] = Argument{
+		Type:       "object",
+		Properties: properties,
+	}
+	return property
+}
diff --git a/pkg/functions/grammar_json_schema.go b/pkg/functions/grammar_json_schema.go
index 7356d01d..4c958ee7 100644
--- a/pkg/functions/grammar_json_schema.go
+++ b/pkg/functions/grammar_json_schema.go
@@ -5,70 +5,12 @@ package functions
 import (
 	"encoding/json"
 	"fmt"
-	"regexp"
 	"sort"
 	"strings"
 
 	"github.com/mudler/LocalAI/pkg/utils"
 )
 
-const (
-	JSONBNF = `root   ::= object
-value  ::= object | array | string | number | ("true" | "false" | "null") ws
-
-object ::=
-  "{" ws (
-            string ":" ws value
-    ("," ws string ":" ws value)*
-  )? "}" ws
-
-array  ::=
-  "[" ws (
-            value
-    ("," ws value)*
-  )? "]" ws
-
-string ::=
-  "\"" (
-    [^"\\] |
-    "\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]) # escapes
-  )* "\"" ws
-
-number ::= ("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? ws
-
-ws ::= ([ \t\n] ws)?`
-)
-
-var (
-	SPACE_RULE = `" "?`
-
-	PRIMITIVE_RULES = map[string]string{
-		"boolean": `("true" | "false") space`,
-		"number":  `("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? space`,
-		"integer": `("-"? ([0-9] | [1-9] [0-9]*)) space`,
-		"string": `"\"" (
-			[^"\\] |
-			"\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F])
-		  )* "\"" space`,
-		// TODO: we shouldn't forbid \" and \\ or all unicode and have this branch here,
-		// however, if we don't have it, the grammar will be ambiguous and
-		// empirically results are way worse.
-		"freestring": `(
-			[^\x00] |
-			"\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F])
-		  )* space`,
-		"null": `"null" space`,
-	}
-
-	INVALID_RULE_CHARS_RE     = regexp.MustCompile(`[^a-zA-Z0-9-]+`)
-	GRAMMAR_LITERAL_ESCAPE_RE = regexp.MustCompile(`[\r\n"]`)
-	GRAMMAR_LITERAL_ESCAPES   = map[string]string{
-		"\r": `\r`,
-		"\n": `\n`,
-		`"`:  `\"`,
-	}
-)
-
 type JSONSchemaConverter struct {
 	propOrder map[string]int
 	rules     map[string]string
@@ -114,18 +56,6 @@ func (sc *JSONSchemaConverter) addRule(name, rule string) string {
 	return key
 }
 
-const arrayNewLines = `arr  ::=
-  "[\n"  (
-		realvalue
-    (",\n"  realvalue)*
-  )? "]"`
-
-const array = `arr  ::=
-  "["  (
-		realvalue
-    (","  realvalue)*
-  )? "]"`
-
 func (sc *JSONSchemaConverter) finalizeGrammar(options ...func(*GrammarOption)) string {
 
 	grammarOpts := &GrammarOption{}
@@ -343,36 +273,3 @@ func (sc *JSONSchemaConverter) GrammarFromBytes(b []byte, options ...func(*Gramm
 	_ = json.Unmarshal(b, &schema)
 	return sc.Grammar(schema, options...)
 }
-
-func jsonString(v interface{}) string {
-	b, _ := json.Marshal(v)
-	return string(b)
-}
-
-type FunctionName struct {
-	Const string `json:"const"`
-}
-
-type Argument struct {
-	Type       string                 `json:"type"`
-	Properties map[string]interface{} `json:"properties"`
-}
-
-type Item struct {
-	Type       string                 `json:"type"`
-	Properties map[string]interface{} `json:"properties"`
-}
-
-type JSONFunctionStructure struct {
-	OneOf []Item                 `json:"oneOf,omitempty"`
-	AnyOf []Item                 `json:"anyOf,omitempty"`
-	Defs  map[string]interface{} `json:"$defs,omitempty"`
-}
-
-func (j JSONFunctionStructure) Grammar(options ...func(*GrammarOption)) string {
-	grammarOpts := &GrammarOption{}
-	grammarOpts.Apply(options...)
-
-	dat, _ := json.Marshal(j)
-	return NewJSONSchemaConverter(grammarOpts.PropOrder).GrammarFromBytes(dat, options...)
-}
diff --git a/pkg/functions/grammar_json_schema_test.go b/pkg/functions/grammar_json_schema_test.go
index bf52bd8d..6402bb40 100644
--- a/pkg/functions/grammar_json_schema_test.go
+++ b/pkg/functions/grammar_json_schema_test.go
@@ -9,16 +9,6 @@ import (
 	. "github.com/onsi/gomega"
 )
 
-func createFunction(field1 string, field2 string, name string, properties map[string]interface{}) map[string]interface{} {
-	property := map[string]interface{}{}
-	property[field1] = FunctionName{Const: name}
-	property[field2] = Argument{
-		Type:       "object",
-		Properties: properties,
-	}
-	return property
-}
-
 var testFunctions = []Item{
 	{
 		Type: "object",
diff --git a/pkg/functions/json_mode.go b/pkg/functions/json_mode.go
new file mode 100644
index 00000000..46361b74
--- /dev/null
+++ b/pkg/functions/json_mode.go
@@ -0,0 +1,28 @@
+package functions
+
+const (
+	JSONBNF = `root   ::= object
+value  ::= object | array | string | number | ("true" | "false" | "null") ws
+
+object ::=
+  "{" ws (
+            string ":" ws value
+    ("," ws string ":" ws value)*
+  )? "}" ws
+
+array  ::=
+  "[" ws (
+            value
+    ("," ws value)*
+  )? "]" ws
+
+string ::=
+  "\"" (
+    [^"\\] |
+    "\\" (["\\/bfnrt] | "u" [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F] [0-9a-fA-F]) # escapes
+  )* "\"" ws
+
+number ::= ("-"? ([0-9] | [1-9] [0-9]*)) ("." [0-9]+)? ([eE] [-+]? [0-9]+)? ws
+
+ws ::= ([ \t\n] ws)?`
+)