Feature: Add support for GT and LT operators

1 files changed, 28 insertions, 7 deletions

diff --git a/src/parser.zig b/src/parser.zig
index f7a6806..ad2b8d0 100644
--- a/src/parser.zig
+++ b/src/parser.zig
@@ -30,10 +30,7 @@ pub const Node = union(enum) {
         condition: *Node,
         statements: []*Node,
     },
-    EQUALITY_EXPRESSION: struct {
-        lhs: *Node,
-        rhs: *Node,
-    },
+    EQUALITY_EXPRESSION: struct { lhs: *Node, rhs: *Node, typ: EqualityExpressionType },
     ADDITIVE_EXPRESSION: struct {
         addition: bool,
         lhs: *Node,
@@ -79,6 +76,12 @@ pub const Node = union(enum) {
     },
 };
 
+pub const EqualityExpressionType = enum {
+    EQ,
+    LT,
+    GT,
+};
+
 pub const Parser = struct {
     tokens: []tokenizer.Token,
     offset: u32,
@@ -266,20 +269,38 @@ pub const Parser = struct {
             return ParserError.ParsingError;
     }
 
-    // EqualityExpression ::= AdditiveExpression "==" AdditiveExpression
+    // EqualityExpression ::= AdditiveExpression ("==" | "<" | ">") AdditiveExpression
     fn parse_equality_expression(self: *Parser) ParserError!*Node {
         errdefer if (!self.try_context) std.debug.print("Error parsing equality expression {any}\n", .{self.peek_token()});
 
         const lhs = try self.parse_additive_expression();
 
-        _ = try self.parse_token(tokenizer.TokenType.EQUALS);
-        _ = try self.parse_token(tokenizer.TokenType.EQUALS);
+        var typ: EqualityExpressionType = undefined;
+
+        if (self.accept_parse(struct {
+            fn parse(iself: *Parser) ParserError!*Node {
+                _ = try iself.parse_token(tokenizer.TokenType.EQUALS);
+                _ = try iself.parse_token(tokenizer.TokenType.EQUALS);
+                return try iself.create_node(.{ .PROGRAM = .{
+                    .statements = &[_]*Node{},
+                } });
+            }
+        }.parse) != null) {
+            typ = .EQ;
+        } else if (self.accept_token(tokenizer.TokenType.LESS) != null) {
+            typ = .LT;
+        } else if (self.accept_token(tokenizer.TokenType.GREATER) != null) {
+            typ = .GT;
+        } else {
+            return ParserError.ParsingError;
+        }
 
         const rhs = try self.parse_additive_expression();
 
         return self.create_node(.{ .EQUALITY_EXPRESSION = .{
             .lhs = lhs,
             .rhs = rhs,
+            .typ = typ,
         } });
     }