util/StringView: add methods StripLeft(), StripRight()

2 files changed, 55 insertions, 0 deletions

diff --git a/src/util/StringView.cxx b/src/util/StringView.cxx
new file mode 100644
index 000000000..904f92f65
--- /dev/null
+++ b/src/util/StringView.cxx
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2013-2015 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "StringView.hxx"
+#include "CharUtil.hxx"
+
+void
+StringView::StripLeft()
+{
+	while (!IsEmpty() && IsWhitespaceOrNull(front()))
+		pop_front();
+}
+
+void
+StringView::StripRight()
+{
+	while (!IsEmpty() && IsWhitespaceOrNull(back()))
+		pop_back();
+}
diff --git a/src/util/StringView.hxx b/src/util/StringView.hxx
index fbae9a7cc..dd6c4dc77 100644
--- a/src/util/StringView.hxx
+++ b/src/util/StringView.hxx
@@ -103,6 +103,16 @@ struct StringView : ConstBuffer<char> {
 	bool EqualsLiteralIgnoreCase(const char (&other)[n]) const {
 		return EqualsIgnoreCase({other, n - 1});
 	}
+
+	/**
+	 * Skip all whitespace at the beginning.
+	 */
+	void StripLeft();
+
+	/**
+	 * Skip all whitespace at the end.
+	 */
+	void StripRight();
 };
 
 #endif