From 13d5854e2f99f959dbf38b2fb769b299e79d7bde Mon Sep 17 00:00:00 2001
From: levlam <levlam@telegram.org>
Date: Tue, 3 Aug 2021 02:58:12 +0300
Subject: [PATCH] Update match_cashtags.

---
 td/telegram/MessageEntity.cpp | 12 ++++++++----
 test/message_entities.cpp     | 11 +++++++++--
 2 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/td/telegram/MessageEntity.cpp b/td/telegram/MessageEntity.cpp
index c284b8ad7..e4dfd459f 100644
--- a/td/telegram/MessageEntity.cpp
+++ b/td/telegram/MessageEntity.cpp
@@ -384,7 +384,7 @@ static vector<Slice> match_cashtags(Slice str) {
   const unsigned char *end = str.uend();
   const unsigned char *ptr = begin;
 
-  // '/(?<=^|[^$\d_\pL\x{200c}])\$([A-Z]{3,8})(?![$\d_\pL\x{200c}])/u'
+  // '/(?<=^|[^$\d_\pL\x{200c}])\$(1INCH|[A-Z]{1,8})(?![$\d_\pL\x{200c}])/u'
 
   UnicodeSimpleCategory category;
   while (true) {
@@ -404,12 +404,16 @@ static vector<Slice> match_cashtags(Slice str) {
     }
 
     auto cashtag_begin = ++ptr;
-    while (ptr != end && 'Z' >= *ptr && *ptr >= 'A') {
-      ptr++;
+    if (end - ptr >= 5 && Slice(ptr, ptr + 5) == Slice("1INCH")) {
+      ptr += 5;
+    } else {
+      while (ptr != end && 'Z' >= *ptr && *ptr >= 'A') {
+        ptr++;
+      }
     }
     auto cashtag_end = ptr;
     auto cashtag_size = cashtag_end - cashtag_begin;
-    if (cashtag_size < 3 || cashtag_size > 8) {
+    if (cashtag_size < 1 || cashtag_size > 8) {
       continue;
     }
 
diff --git a/test/message_entities.cpp b/test/message_entities.cpp
index fd6ad997a..6583b9129 100644
--- a/test/message_entities.cpp
+++ b/test/message_entities.cpp
@@ -137,8 +137,9 @@ TEST(MessageEntities, cashtag) {
   check_cashtag("$ab", {});
   check_cashtag("$abc", {});
   check_cashtag("$", {});
-  check_cashtag("$A", {});
-  check_cashtag("$AB", {});
+  check_cashtag("$A", {"$A"});
+  check_cashtag("$AB", {"$AB"});
+  check_cashtag("$ABС", {});
   check_cashtag("$АBC", {});
   check_cashtag("$АВС", {});
   check_cashtag("$ABC", {"$ABC"});
@@ -160,6 +161,12 @@ TEST(MessageEntities, cashtag) {
   check_cashtag(" А$ABC ", {});
   check_cashtag("$ABC$DEF $GHI $KLM", {"$GHI", "$KLM"});
   check_cashtag("$TEST", {"$TEST"});
+  check_cashtag("$1INC", {});
+  check_cashtag("$1INCH", {"$1INCH"});
+  check_cashtag("...$1INCH...", {"$1INCH"});
+  check_cashtag("$1inch", {});
+  check_cashtag("$1INCHA", {});
+  check_cashtag("$1INCHА", {});
   check_cashtag(u8"$ABC\u2122", {"$ABC"});
   check_cashtag(u8"\u2122$ABC", {"$ABC"});
   check_cashtag(u8"\u2122$ABC\u2122", {"$ABC"});