From ac11122e673ef5d82488db6e00774d577107f02c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Bylica?= <chfast@gmail.com>
Date: Mon, 9 Dec 2019 21:13:49 +0100
Subject: [PATCH] tools: Add output stream operator for evmc_revision

---
 tools/evmc/utils.cpp | 38 ++++++++++++++++++++++++++++++++++++++
 tools/evmc/utils.hpp |  3 +++
 2 files changed, 41 insertions(+)

diff --git a/tools/evmc/utils.cpp b/tools/evmc/utils.cpp
index fdb87b0..e41238c 100644
--- a/tools/evmc/utils.cpp
+++ b/tools/evmc/utils.cpp
@@ -117,4 +117,42 @@ std::ostream& operator<<(std::ostream& os, evmc_status_code status_code)
     return os << s;
 }
 
+std::ostream& operator<<(std::ostream& os, evmc_revision revision)
+{
+    const char* s = nullptr;
+    switch (revision)
+    {
+    case EVMC_FRONTIER:
+        s = "Frontier";
+        break;
+    case EVMC_HOMESTEAD:
+        s = "Homestead";
+        break;
+    case EVMC_TANGERINE_WHISTLE:
+        s = "Tangerine Whistle";
+        break;
+    case EVMC_SPURIOUS_DRAGON:
+        s = "Spurious Dragon";
+        break;
+    case EVMC_BYZANTIUM:
+        s = "Byzantium";
+        break;
+    case EVMC_CONSTANTINOPLE:
+        s = "Constantinople";
+        break;
+    case EVMC_PETERSBURG:
+        s = "Petersburg";
+        break;
+    case EVMC_ISTANBUL:
+        s = "Istanbul";
+        break;
+    case EVMC_BERLIN:
+        s = "Berlin";
+        break;
+    default:
+        throw std::invalid_argument{"invalid EVM revision: " + std::to_string(revision)};
+    }
+    return os << s;
+}
+
 }  // namespace evmc
diff --git a/tools/evmc/utils.hpp b/tools/evmc/utils.hpp
index 8591fa7..df0851f 100644
--- a/tools/evmc/utils.hpp
+++ b/tools/evmc/utils.hpp
@@ -33,4 +33,7 @@ std::string hex(const uint8_t* data, size_t size);
 /// Output stream operator for evmc_status_code.
 std::ostream& operator<<(std::ostream& os, evmc_status_code status_code);
 
+/// Output stream operator for EVM revision.
+std::ostream& operator<<(std::ostream& os, evmc_revision revision);
+
 }  // namespace evmc