From 0a31ea7bf88cdc313a757db5e047345ed514e00d Mon Sep 17 00:00:00 2001
From: Sasha Koshka <sashakoshka@tebibyte.media>
Date: Thu, 11 Aug 2022 02:54:20 -0500
Subject: [PATCH] Support for digraphs such as &&, <<, ++

---
 lexer/lexer.go | 40 +++++++++++++++++++++++++++++++++++-----
 1 file changed, 35 insertions(+), 5 deletions(-)

diff --git a/lexer/lexer.go b/lexer/lexer.go
index c17a549..1051d1b 100644
--- a/lexer/lexer.go
+++ b/lexer/lexer.go
@@ -159,7 +159,13 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		})
 		err = lexer.nextRune()
 	case '+':
-		// TODO: tokenize plus begin
+		err = lexer.nextRune()
+		if err != nil { return }
+		token := Token { kind: TokenKindPlus }
+		if lexer.char == '+' {
+			token.kind = TokenKindIncrement
+		}
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '-':
 		err = lexer.tokenizeDashBeginning()
@@ -194,16 +200,40 @@ func (lexer *LexingOperation) tokenizeSymbolBeginning () (err error) {
 		})
 		err = lexer.nextRune()
 	case '<':
-		// TODO: tokenize less than begin
+		err = lexer.nextRune()
+		if err != nil { return }
+		token := Token { kind: TokenKindLessThan }
+		if lexer.char == '<' {
+			token.kind = TokenKindLShift
+		}
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '>':
-		// TODO: tokenize greater than begin
+		err = lexer.nextRune()
+		if err != nil { return }
+		token := Token { kind: TokenKindGreaterThan }
+		if lexer.char == '>' {
+			token.kind = TokenKindRShift
+		}
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '|':
-		// TODO: tokenize bar begin
+		err = lexer.nextRune()
+		if err != nil { return }
+		token := Token { kind: TokenKindBinaryOr }
+		if lexer.char == '|' {
+			token.kind = TokenKindLogicalOr
+		}
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	case '&':
-		// TODO: tokenize and begin
+		err = lexer.nextRune()
+		if err != nil { return }
+		token := Token { kind: TokenKindBinaryAnd }
+		if lexer.char == '&' {
+			token.kind = TokenKindLogicalAnd
+		}
+		lexer.addToken(token)
 		err = lexer.nextRune()
 	default:
 		err = file.NewError (