grammar: support begin blocks

Author: leostera

grammar.js

@@ -176,6 +176,7 @@ module.exports = grammar({
 
     _expression: ($) =>
       choice(
+        $.expr_begin_block,
         $.expr_list_comprehension,
         $.expr_operator,
         $.expr_receive,
@@ -192,6 +193,8 @@ module.exports = grammar({
         $.match
       ),
 
+    expr_begin_block: ($) => seq("begin", sepBy(COMMA, $.expression), "end"),
+
     expr_list_comprehension: ($) =>
       seq(
         BRACKET_LEFT,

src/grammar.json

@@ -505,6 +505,10 @@
     "_expression": {
       "type": "CHOICE",
       "members": [
+        {
+          "type": "SYMBOL",
+          "name": "expr_begin_block"
+        },
         {
           "type": "SYMBOL",
           "name": "expr_list_comprehension"
@@ -563,6 +567,44 @@
         }
       ]
     },
+    "expr_begin_block": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "begin"
+        },
+        {
+          "type": "SEQ",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "expression"
+            },
+            {
+              "type": "REPEAT",
+              "content": {
+                "type": "SEQ",
+                "members": [
+                  {
+                    "type": "STRING",
+                    "value": ","
+                  },
+                  {
+                    "type": "SYMBOL",
+                    "name": "expression"
+                  }
+                ]
+              }
+            }
+          ]
+        },
+        {
+          "type": "STRING",
+          "value": "end"
+        }
+      ]
+    },
     "expr_list_comprehension": {
       "type": "SEQ",
       "members": [

src/node-types.json

@@ -191,6 +191,21 @@
       ]
     }
   },
+  {
+    "type": "expr_begin_block",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": true,
+      "required": true,
+      "types": [
+        {
+          "type": "expression",
+          "named": true
+        }
+      ]
+    }
+  },
   {
     "type": "expr_bitstring_comprehension",
     "named": true,
@@ -630,6 +645,10 @@
           "type": "case",
           "named": true
         },
+        {
+          "type": "expr_begin_block",
+          "named": true
+        },
         {
           "type": "expr_bitstring_comprehension",
           "named": true
@@ -1507,6 +1526,10 @@
     "type": "band",
     "named": false
   },
+  {
+    "type": "begin",
+    "named": false
+  },
   {
     "type": "big",
     "named": false
@@ -1573,11 +1596,11 @@
   },
   {
     "type": "float",
-    "named": false
+    "named": true
   },
   {
     "type": "float",
-    "named": true
+    "named": false
   },
   {
     "type": "fun",