2 files changed, 65 insertions, 9 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;
 }
-
 }
 
diff --git a/src/core/Utils.hpp b/src/core/Utils.hpp
index 2fcd794..14bd7b4 100644
--- a/src/core/Utils.hpp
+++ b/src/core/Utils.hpp
@@ -16,18 +16,16 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #ifndef _OUSIA_UTILS_H_
 #define _OUSIA_UTILS_H_
 
+#include <sstream>
 #include <string>
 
 namespace ousia {
 
 class Utils {
-
 public:
-
 	/**
 	 * Returns true if the given character is in [A-Za-z]
 	 */
@@ -39,10 +37,7 @@ public:
 	/**
 	 * Returns true if the given character is in [0-9]
 	 */
-	static bool isNumeric(const char c)
-	{
-		return (c >= '0') && (c <= '9');
-	}
+	static bool isNumeric(const char c) { return (c >= '0') && (c <= '9'); }
 
 	/**
 	 * Returns true if the given character is in [A-Za-z0-9]
@@ -57,8 +52,49 @@ public:
 	 */
 	static bool isIdentifier(const std::string &name);
 
-};
+	/**
+	 * Returns true if the given character is a whitespace character.
+	 */
+	static bool isWhitespace(const char c)
+	{
+		return (c == ' ') || (c == '\t') || (c == '\n') || (c == '\r');
+	}
 
+	/**
+	 * Removes whitespace at the beginning and the end of the given string.
+	 */
+	static std::string trim(const std::string &s);
+
+	/**
+	 * Turns the elements of a collection into a string separated by the
+	 * given delimiter.
+	 *
+	 * @param es is an iterable container of elements that can be appended to an
+	 * output stream (the << operator must be implemented).
+	 * @param delim is the delimiter that should be used to separate the items.
+	 * @param start is a character sequence that should be prepended to the
+	 * result.
+	 * @param end is a character sequence that should be appended to the result.
+	 */
+	template <class T>
+	static std::string join(T es, const std::string &delim,
+	                        const std::string &start = "",
+	                        const std::string &end = "")
+	{
+		std::stringstream res;
+		bool first = true;
+		res << start;
+		for (const auto &e : es) {
+			if (!first) {
+				res << delim;
+			}
+			res << e;
+			first = false;
+		}
+		res << end;
+		return res.str();
+	}
+};
 }
 
 #endif /* _OUSIA_UTILS_H_ */