added trim, join and isWhitespace function to Utils

1 files changed, 21 insertions, 1 deletions

diff --git a/src/core/Utils.cpp b/src/core/Utils.cpp
index 184fdd0..c460ed4 100644
--- a/src/core/Utils.cpp
+++ b/src/core/Utils.cpp
@@ -16,10 +16,31 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <algorithm>
+#include <limits>
+
 #include "Utils.hpp"
 
 namespace ousia {
 
+std::string Utils::trim(const std::string &s)
+{
+	size_t firstNonWhitespace = std::numeric_limits<size_t>::max();
+	size_t lastNonWhitespace = 0;
+	for (size_t i = 0; i < s.size(); i++) {
+		if (!isWhitespace(s[i])) {
+			firstNonWhitespace = std::min(i, firstNonWhitespace);
+			lastNonWhitespace = std::max(i, lastNonWhitespace);
+		}
+	}
+
+	if (firstNonWhitespace < lastNonWhitespace) {
+		return s.substr(firstNonWhitespace,
+		                lastNonWhitespace - firstNonWhitespace + 1);
+	}
+	return std::string{};
+}
+
 bool Utils::isIdentifier(const std::string &name)
 {
 	bool first = true;
@@ -34,6 +55,5 @@ bool Utils::isIdentifier(const std::string &name)
 	}
 	return true;
 }
-
 }