From b9aa94ee0dcbdc986f2cfc2f34f8ffc8c41c8ef0 Mon Sep 17 00:00:00 2001
From: gingerBill <bill@gingerbill.org>
Date: Mon, 7 Dec 2020 11:30:54 +0000
Subject: [PATCH] Add scan_peek_n to package text/scanner #800

---
 core/text/scanner/scanner.odin | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/core/text/scanner/scanner.odin b/core/text/scanner/scanner.odin
index a3c44e909..bd1b24fe2 100644
--- a/core/text/scanner/scanner.odin
+++ b/core/text/scanner/scanner.odin
@@ -175,6 +175,16 @@ peek_n :: proc(s: ^Scanner, n: int) -> rune {
 	return ch;
 }
 
+scan_peek_n :: proc(s: ^Scanner, n: int) -> (tok: rune) {
+	assert(n >= 0);
+	prev_s := s^;
+	for in 0..<n {
+		tok = scan(s);
+	}
+	tok = scan(s);
+	s^ = prev_s;
+	return;
+}
 
 error :: proc(s: ^Scanner, msg: string) {
 	s.error_count += 1;