Add top-level declarations

grammar.js

@@ -28,6 +28,7 @@ module.exports = grammar({
   rules: {
     source_file: ($) => choice(
       $._expr,
+      optional($._declaration_chunks),
     ),
 
     // Expressions {{{

src/grammar.json

@@ -8,6 +8,18 @@
         {
           "type": "SYMBOL",
           "name": "_expr"
+        },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "_declaration_chunks"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
         }
       ]
     },

src/node-types.json

@@ -1475,8 +1475,8 @@
     "named": true,
     "fields": {},
     "children": {
-      "multiple": false,
+      "multiple": true,
-      "required": true,
+      "required": false,
       "types": [
         {
           "type": "array_expression",
@@ -1514,6 +1514,10 @@
           "type": "if_expression",
           "named": true
         },
+        {
+          "type": "import_declaration",
+          "named": true
+        },
         {
           "type": "integer_literal",
           "named": true

test/corpus/declarations.txt

@@ -0,0 +1,34 @@
+================================================================================
+Empty declarations
+================================================================================
+
+--------------------------------------------------------------------------------
+
+(source_file)
+
+================================================================================
+Import
+================================================================================
+
+import "a.tih"
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (import_declaration
+    file: (string_literal)))
+
+================================================================================
+Multiple imports
+================================================================================
+
+import "a.tih"
+import "b.tih"
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (import_declaration
+    file: (string_literal))
+  (import_declaration
+    file: (string_literal)))