implement startsWith and endsWith.

Foundation/include/Poco/String.h

@@ -623,6 +623,22 @@ S cat(const S& delim, const It& begin, const It& end)
 }
 
 
+template <class S>
+bool startsWith(const S& str, const S& prefix)
+	/// Tests whether the string starts with the given prefix.
+{
+	return equal(prefix.begin(), prefix.end(), str.begin());
+}
+
+
+template <class S>
+bool endsWith(const S& str, const S& suffix)
+	/// Tests whether the string ends with the given suffix.
+{
+	return equal(suffix.rbegin(), suffix.rend(), str.rbegin());
+}
+
+
 //
 // case-insensitive string equality
 //

Foundation/testsuite/src/StringTest.cpp

@@ -47,6 +47,8 @@ using Poco::replaceInPlace;
 using Poco::remove;
 using Poco::removeInPlace;
 using Poco::cat;
+using Poco::startsWith;
+using Poco::endsWith;
 using Poco::strToInt;
 using Poco::strToFloat;
 using Poco::strToDouble;
@@ -435,6 +437,55 @@ void StringTest::testCat()
 }
 
 
+void StringTest::testStartsWith()
+{
+	std::string s1("o");
+
+	assert (startsWith(s1, std::string("o")));
+	assert (startsWith(s1, std::string("")));
+
+	assert (!startsWith(s1, std::string("O")));
+	assert (!startsWith(s1, std::string("1")));
+
+	std::string s2("");
+
+	assert (startsWith(s2, std::string("")));
+
+	assert (!startsWith(s2, std::string("o")));
+
+	std::string s3("oO");
+
+	assert (startsWith(s3, std::string("o")));
+
+	assert (!startsWith(s3, std::string(" o")));
+}
+
+
+void StringTest::testEndsWith()
+{
+	std::string s1("o");
+
+	assert (endsWith(s1, std::string("o")));
+	assert (endsWith(s1, std::string("")));
+
+	assert (!endsWith(s1, std::string("O")));
+	assert (!endsWith(s1, std::string("1")));
+
+
+	std::string s2("");
+
+	assert (endsWith(s2, std::string("")));
+
+	assert (!endsWith(s2, std::string("o")));
+
+	std::string s3("Oo");
+
+	assert (endsWith(s3, std::string("o")));
+
+	assert (!endsWith(s3, std::string("o ")));	
+}
+
+
 void StringTest::testStringToInt()
 {
 //gcc on Mac emits warnings that cannot be suppressed
@@ -1187,6 +1238,8 @@ CppUnit::Test* StringTest::suite()
 	CppUnit_addTest(pSuite, StringTest, testReplace);
 	CppUnit_addTest(pSuite, StringTest, testReplaceInPlace);
 	CppUnit_addTest(pSuite, StringTest, testCat);
+	CppUnit_addTest(pSuite, StringTest, testStartsWith);
+	CppUnit_addTest(pSuite, StringTest, testEndsWith);
 	CppUnit_addTest(pSuite, StringTest, testStringToInt);
 	CppUnit_addTest(pSuite, StringTest, testStringToFloat);
 	CppUnit_addTest(pSuite, StringTest, testStringToDouble);

Foundation/testsuite/src/StringTest.h

@@ -44,6 +44,8 @@ public:
 	void testReplace();
 	void testReplaceInPlace();
 	void testCat();
+	void testStartsWith();
+	void testEndsWith();
 
 	void testStringToInt();
 	void testStringToFloat();