Add variable declarations

src/grammar.json

@@ -1042,12 +1042,70 @@
     "_declaration_chunk": {
       "type": "CHOICE",
       "members": [
+        {
+          "type": "SYMBOL",
+          "name": "variable_declaration"
+        },
         {
           "type": "SYMBOL",
           "name": "import_declaration"
         }
       ]
     },
+    "variable_declaration": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "var"
+        },
+        {
+          "type": "FIELD",
+          "name": "name",
+          "content": {
+            "type": "SYMBOL",
+            "name": "identifier"
+          }
+        },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SEQ",
+              "members": [
+                {
+                  "type": "STRING",
+                  "value": ":"
+                },
+                {
+                  "type": "FIELD",
+                  "name": "type",
+                  "content": {
+                    "type": "SYMBOL",
+                    "name": "identifier"
+                  }
+                }
+              ]
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
+        {
+          "type": "STRING",
+          "value": ":="
+        },
+        {
+          "type": "FIELD",
+          "name": "value",
+          "content": {
+            "type": "SYMBOL",
+            "name": "_expr"
+          }
+        }
+      ]
+    },
     "import_declaration": {
       "type": "SEQ",
       "members": [

src/node-types.json

@@ -1244,6 +1244,10 @@
           {
             "type": "import_declaration",
             "named": true
+          },
+          {
+            "type": "variable_declaration",
+            "named": true
           }
         ]
       }
@@ -1550,6 +1554,10 @@
           "type": "unary_expression",
           "named": true
         },
+        {
+          "type": "variable_declaration",
+          "named": true
+        },
         {
           "type": "while_expression",
           "named": true
@@ -1666,6 +1674,110 @@
       }
     }
   },
+  {
+    "type": "variable_declaration",
+    "named": true,
+    "fields": {
+      "name": {
+        "multiple": false,
+        "required": true,
+        "types": [
+          {
+            "type": "identifier",
+            "named": true
+          }
+        ]
+      },
+      "type": {
+        "multiple": false,
+        "required": false,
+        "types": [
+          {
+            "type": "identifier",
+            "named": true
+          }
+        ]
+      },
+      "value": {
+        "multiple": false,
+        "required": true,
+        "types": [
+          {
+            "type": "array_expression",
+            "named": true
+          },
+          {
+            "type": "array_value",
+            "named": true
+          },
+          {
+            "type": "assignment_expression",
+            "named": true
+          },
+          {
+            "type": "binary_expression",
+            "named": true
+          },
+          {
+            "type": "break_expression",
+            "named": true
+          },
+          {
+            "type": "for_expression",
+            "named": true
+          },
+          {
+            "type": "function_call",
+            "named": true
+          },
+          {
+            "type": "identifier",
+            "named": true
+          },
+          {
+            "type": "if_expression",
+            "named": true
+          },
+          {
+            "type": "integer_literal",
+            "named": true
+          },
+          {
+            "type": "let_expression",
+            "named": true
+          },
+          {
+            "type": "nil_literal",
+            "named": true
+          },
+          {
+            "type": "record_expression",
+            "named": true
+          },
+          {
+            "type": "record_value",
+            "named": true
+          },
+          {
+            "type": "sequence_expression",
+            "named": true
+          },
+          {
+            "type": "string_literal",
+            "named": true
+          },
+          {
+            "type": "unary_expression",
+            "named": true
+          },
+          {
+            "type": "while_expression",
+            "named": true
+          }
+        ]
+      }
+    }
+  },
   {
     "type": "while_expression",
     "named": true,
@@ -1848,6 +1960,10 @@
     "type": ".",
     "named": false
   },
+  {
+    "type": ":",
+    "named": false
+  },
   {
     "type": ":=",
     "named": false
@@ -1936,6 +2052,10 @@
     "type": "to",
     "named": false
   },
+  {
+    "type": "var",
+    "named": false
+  },
   {
     "type": "while",
     "named": false