From 86a3fe34b4d0361ff1deb307f211d7bbdb1f14fa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Emmanuel=20Beno=C3=AEt?= <tseeker@nocternity.net>
Date: Wed, 29 Nov 2017 09:24:51 +0100
Subject: [PATCH] String builder - truncate() method

---
 include/ebcl/Strings.hh        |  1 +
 include/ebcl/inline/Strings.hh | 10 ++++++++++
 tests/strings-builder.cc       | 25 +++++++++++++++++++++++++
 3 files changed, 36 insertions(+)

diff --git a/include/ebcl/Strings.hh b/include/ebcl/Strings.hh
index a8e47da..0c6ddc7 100644
--- a/include/ebcl/Strings.hh
+++ b/include/ebcl/Strings.hh
@@ -391,6 +391,7 @@ class T_StringBuilder
 	T_StringBuilder& ensureCapacity( uint32_t minCap );
 	T_StringBuilder& clear( );
 	T_StringBuilder& free( );
+	T_StringBuilder& truncate( uint32_t maxLength ) noexcept;
 
 	// ---------------------------------------------------------------------
 
diff --git a/include/ebcl/inline/Strings.hh b/include/ebcl/inline/Strings.hh
index 7780c8b..99712c7 100644
--- a/include/ebcl/inline/Strings.hh
+++ b/include/ebcl/inline/Strings.hh
@@ -458,6 +458,16 @@ inline T_StringBuilder& T_StringBuilder::clear( )
 	return *this;
 }
 
+inline T_StringBuilder& T_StringBuilder::truncate(
+		const uint32_t maxLength ) noexcept
+{
+	if ( maxLength < length_ ) {
+		size_ = UTF8GetMemoryOffset( data_ , maxLength );
+		length_ = maxLength;
+	}
+	return *this;
+}
+
 /*----------------------------------------------------------------------------*/
 
 inline bool T_StringBuilder::operator== ( T_StringBuilder const& other ) const
diff --git a/tests/strings-builder.cc b/tests/strings-builder.cc
index 586b322..4b9d374 100644
--- a/tests/strings-builder.cc
+++ b/tests/strings-builder.cc
@@ -29,6 +29,9 @@ class StringsBuilderTest : public CppUnit::TestFixture
 		CPPUNIT_TEST( testClear );
 		CPPUNIT_TEST( testFree );
 
+		CPPUNIT_TEST( testTruncate );
+		CPPUNIT_TEST( testTruncateLonger );
+
 		CPPUNIT_TEST( testAppendOther );
 		CPPUNIT_TEST( testAppendSwap );
 		CPPUNIT_TEST( testAppendStr );
@@ -121,6 +124,9 @@ public:
 	void testClear( );
 	void testFree( );
 
+	void testTruncate( );
+	void testTruncateLonger( );
+
 	void testAppendOther( );
 	void testAppendSwap( );
 	void testAppendStr( );
@@ -425,6 +431,25 @@ void StringsBuilderTest::testFree( )
 
 /*----------------------------------------------------------------------------*/
 
+void StringsBuilderTest::testTruncate( )
+{
+	T_StringBuilder sb( "this is\uf1bb a test" );
+	sb.truncate( 8 );
+	CPPUNIT_ASSERT_EQUAL( uint32_t( 8 ) , sb.length( ) );
+	CPPUNIT_ASSERT_EQUAL( uint32_t( 10 ) , sb.size( ) );
+}
+
+void StringsBuilderTest::testTruncateLonger( )
+{
+	T_StringBuilder sb( "this is\uf1bb a test" );
+	sb.truncate( 20 );
+	printf( "%d\n" , sb.size( ) );
+	CPPUNIT_ASSERT_EQUAL( uint32_t( 15 ) , sb.length( ) );
+	CPPUNIT_ASSERT_EQUAL( uint32_t( 17 ) , sb.size( ) );
+}
+
+/*----------------------------------------------------------------------------*/
+
 void StringsBuilderTest::testAppendOther( )
 {
 	T_StringBuilder sb1( "this is " ) , sb2( "a test!" );