diff --git a/liblangutil/CMakeLists.txt b/liblangutil/CMakeLists.txt
index 4539376f0..1c3d5a05e 100644
--- a/liblangutil/CMakeLists.txt
+++ b/liblangutil/CMakeLists.txt
@@ -1,5 +1,6 @@
 # Solidity Commons Library (Solidity related sharing bits between libsolidity and libyul)
 set(sources
+	Common.h
 	CharStream.cpp
 	CharStream.h
 	ErrorReporter.cpp
diff --git a/liblangutil/Common.h b/liblangutil/Common.h
new file mode 100644
index 000000000..ed6aa2cbc
--- /dev/null
+++ b/liblangutil/Common.h
@@ -0,0 +1,63 @@
+/*
+	This file is part of solidity.
+	solidity is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+	solidity is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+	You should have received a copy of the GNU General Public License
+	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#pragma once
+
+namespace langutil
+{
+
+inline bool isDecimalDigit(char c)
+{
+	return '0' <= c && c <= '9';
+}
+
+inline bool isHexDigit(char c)
+{
+	return
+		isDecimalDigit(c) ||
+		('a' <= c && c <= 'f') ||
+		('A' <= c && c <= 'F');
+}
+
+inline bool isLineTerminator(char c)
+{
+	return c == '\n';
+}
+
+inline bool isWhiteSpace(char c)
+{
+	return c == ' ' || c == '\n' || c == '\t' || c == '\r';
+}
+
+inline bool isIdentifierStart(char c)
+{
+	return c == '_' || c == '$' || ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
+}
+
+inline bool isIdentifierPart(char c)
+{
+	return isIdentifierStart(c) || isDecimalDigit(c);
+}
+
+inline int hexValue(char c)
+{
+	if (c >= '0' && c <= '9')
+		return c - '0';
+	else if (c >= 'a' && c <= 'f')
+		return c - 'a' + 10;
+	else if (c >= 'A' && c <= 'F')
+		return c - 'A' + 10;
+	else return -1;
+}
+}
diff --git a/liblangutil/Scanner.cpp b/liblangutil/Scanner.cpp
index 3463783bf..ed6322472 100644
--- a/liblangutil/Scanner.cpp
+++ b/liblangutil/Scanner.cpp
@@ -50,6 +50,7 @@
  * Solidity scanner.
  */
 
+#include <liblangutil/Common.h>
 #include <liblangutil/Exceptions.h>
 #include <liblangutil/Scanner.h>
 #include <algorithm>
@@ -61,47 +62,6 @@ using namespace std;
 namespace langutil
 {
 
-namespace
-{
-bool isDecimalDigit(char c)
-{
-	return '0' <= c && c <= '9';
-}
-bool isHexDigit(char c)
-{
-	return
-		isDecimalDigit(c) ||
-		('a' <= c && c <= 'f') ||
-		('A' <= c && c <= 'F');
-}
-bool isLineTerminator(char c)
-{
-	return c == '\n';
-}
-bool isWhiteSpace(char c)
-{
-	return c == ' ' || c == '\n' || c == '\t' || c == '\r';
-}
-bool isIdentifierStart(char c)
-{
-	return c == '_' || c == '$' || ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
-}
-bool isIdentifierPart(char c)
-{
-	return isIdentifierStart(c) || isDecimalDigit(c);
-}
-int hexValue(char c)
-{
-	if (c >= '0' && c <= '9')
-		return c - '0';
-	else if (c >= 'a' && c <= 'f')
-		return c - 'a' + 10;
-	else if (c >= 'A' && c <= 'F')
-		return c - 'A' + 10;
-	else return -1;
-}
-} // end anonymous namespace
-
 std::string to_string(ScannerError _errorCode)
 {
 	switch (_errorCode)
diff --git a/test/libsolidity/util/TestFileParser.cpp b/test/libsolidity/util/TestFileParser.cpp
index 9f05e72ff..bbd867bb7 100644
--- a/test/libsolidity/util/TestFileParser.cpp
+++ b/test/libsolidity/util/TestFileParser.cpp
@@ -16,8 +16,8 @@
 */
 
 #include <test/libsolidity/util/TestFileParser.h>
-
 #include <test/Options.h>
+#include <liblangutil/Common.h>
 #include <boost/algorithm/string.hpp>
 #include <boost/algorithm/string/predicate.hpp>
 #include <boost/optional.hpp>
@@ -33,18 +33,6 @@ using namespace dev::solidity::test;
 using namespace std;
 using namespace soltest;
 
-namespace
-{
-	bool isIdentifierStart(char c)
-	{
-		return c == '_' || c == '$' || ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
-	}
-	bool isIdentifierPart(char c)
-	{
-		return isIdentifierStart(c) || isdigit(c);
-	}
-}
-
 vector<dev::solidity::test::FunctionCall> TestFileParser::parseFunctionCalls()
 {
 	vector<FunctionCall> calls;
@@ -354,14 +342,14 @@ void TestFileParser::Scanner::scanNextToken()
 			token = selectToken(Token::RParen);
 			break;
 		default:
-			if (isIdentifierStart(current()))
+			if (langutil::isIdentifierStart(current()))
 			{
 				TokenDesc detectedToken = detectKeyword(scanIdentifierOrKeyword());
 				token = selectToken(detectedToken.first, detectedToken.second);
 			}
-			else if (isdigit(current()))
+			else if (langutil::isDecimalDigit(current()))
 				token = selectToken(Token::Number, scanNumber());
-			else if (isspace(current()))
+			else if (langutil::isWhiteSpace(current()))
 				token = selectToken(Token::Whitespace);
 			else if (isEndOfLine())
 				token = selectToken(Token::EOS);
@@ -389,7 +377,7 @@ string TestFileParser::Scanner::scanIdentifierOrKeyword()
 {
 	string identifier;
 	identifier += current();
-	while (isIdentifierPart(peek()))
+	while (langutil::isIdentifierPart(peek()))
 	{
 		advance();
 		identifier += current();
@@ -401,7 +389,7 @@ string TestFileParser::Scanner::scanNumber()
 {
 	string number;
 	number += current();
-	while (isdigit(peek()))
+	while (langutil::isDecimalDigit(peek()))
 	{
 		advance();
 		number += current();