From 19be6cd818e4bb1a49325d8bfea7f7727d85c933 Mon Sep 17 00:00:00 2001
From: chriseth <chris@ethereum.org>
Date: Tue, 16 Oct 2018 17:58:17 +0200
Subject: Some well-formedness checks for the Yul AST.

---
 libdevcore/CommonData.cpp | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'libdevcore/CommonData.cpp')

diff --git a/libdevcore/CommonData.cpp b/libdevcore/CommonData.cpp
index 6d7c74d7..fa1a5353 100644
--- a/libdevcore/CommonData.cpp
+++ b/libdevcore/CommonData.cpp
@@ -110,3 +110,26 @@ string dev::getChecksummedAddress(string const& _addr)
 	}
 	return ret;
 }
+
+bool dev::isValidHex(string const& _string)
+{
+	if (_string.substr(0, 2) != "0x")
+		return false;
+	if (_string.find_first_not_of("0123456789abcdefABCDEF", 2) != string::npos)
+		return false;
+	return true;
+}
+
+bool dev::isValidDecimal(string const& _string)
+{
+	if (_string.empty())
+		return false;
+	if (_string == "0")
+		return true;
+	// No leading zeros
+	if (_string.front() == '0')
+		return false;
+	if (_string.find_first_not_of("0123456789") != string::npos)
+		return false;
+	return true;
+}
-- 
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