From 2ad2be250a68e907b308b120b934edcbfc99ae6e Mon Sep 17 00:00:00 2001
From: Ben Winston
Date: Sat, 20 May 2023 22:54:07 -0400
Subject: block scope and local variables (not really working)

---
 parser.d | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

(limited to 'parser.d')

diff --git a/parser.d b/parser.d
index ef1d736..978b218 100644
--- a/parser.d
+++ b/parser.d
@@ -13,6 +13,7 @@ enum FormType {
     SYMBOL,
     FUNC,
     DEF,
+    BLOCK,
 
     EOF,
     PARSE_ERROR
@@ -79,6 +80,20 @@ class ParseError : Form {
     }
 }
 
+class Block : Form {
+
+    Form[] blockBody;
+
+    this(int line) {
+        this.line = line;
+        this.type = FormType.BLOCK;
+    }
+
+    void addToBody(Form f) {
+        this.blockBody ~= f;
+    }
+}
+
 class Cons : Form {
 
     Form head;
@@ -376,6 +391,27 @@ class Parser {
         return func;
     }
 
+    Form parseBlock() {
+        Block block = new Block(line);
+        char next;
+        while(peekable()) {
+            next = peek();
+            if (next == ')') {
+                break;
+            }
+            block.addToBody(parseForm());
+        }
+
+        if (!peekable()) {
+            return new ParseError("unterminated block", line);
+        }
+
+        advance();  // consume closing paren
+
+        return block;
+
+    }
+
 
     Form parseCons() {
         skipWhitespace();
@@ -395,6 +431,8 @@ class Parser {
                     return parseFunc();
                 case "def":
                     return parseDef();
+                case "block":
+                    return parseBlock();
                 default:
                     break;
             }
-- 
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