1 files changed, 120 insertions, 0 deletions
diff --git a/src/core/common/Whitespace.hpp b/src/core/common/Whitespace.hpp
new file mode 100644
index 0000000..1e9f36a
--- /dev/null
+++ b/src/core/common/Whitespace.hpp
@@ -0,0 +1,120 @@
+/*
+    Ousía
+    Copyright (C) 2014  Benjamin Paaßen, Andreas Stöckel
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/**
+ * @file Whitespace.hpp
+ *
+ * Contains the WhitespaceMode enum used in various places, as well es functions
+ * for trimming and collapsing whitespaces.
+ *
+ * @author Andreas Stöckel (astoecke@techfak.uni-bielefeld.de)
+ */
+
+#ifndef _OUSIA_WHITESPACE_HPP_
+#define _OUSIA_WHITESPACE_HPP_
+
+#include <string>
+#include <utility>
+
+namespace ousia {
+
+/**
+ * Enum specifying the whitespace handling mode of the tokenizer and the
+ * parsers.
+ */
+enum class WhitespaceMode {
+	/**
+     * Preserves all whitespaces as they are found in the source file.
+     */
+	PRESERVE,
+
+	/**
+     * Trims whitespace at the beginning and the end of the found text.
+     */
+	TRIM,
+
+	/**
+     * Whitespaces are trimmed and collapsed, multiple whitespace characters
+     * are replaced by a single space character.
+     */
+	COLLAPSE
+};
+
+/**
+ * Collection of functions for trimming or collapsing whitespace.
+ */
+class Whitespace {
+	/**
+	 * Removes whitespace at the beginning and the end of the given string.
+	 *
+	 * @param s is the string that should be trimmed.
+	 * @return a trimmed copy of s.
+	 */
+	static std::string trim(const std::string &s);
+
+	/**
+	 * Trims the given string or vector of chars by returning the start and end
+	 * index.
+	 *
+	 * @param s is the container that should be trimmed.
+	 * @param f is a function that returns true for values that should be
+	 * removed.
+	 * @return start and end index. Note that "end" points at the character
+	 * beyond the end, thus "end" minus "start"
+	 */
+	template <class T, class Filter>
+	static std::pair<size_t, size_t> trim(const T &s, Filter f)
+	{
+		size_t start = 0;
+		for (size_t i = 0; i < s.size(); i++) {
+			if (!f(s[i])) {
+				start = i;
+				break;
+			}
+		}
+
+		size_t end = 0;
+		for (ssize_t i = s.size() - 1; i >= static_cast<ssize_t>(start); i--) {
+			if (!f(s[i])) {
+				end = i + 1;
+				break;
+			}
+		}
+
+		if (end < start) {
+			start = 0;
+			end = 0;
+		}
+
+		return std::pair<size_t, size_t>{start, end};
+	}
+
+	/**
+	 * Collapses the whitespaces in the given string (trims the string and
+	 * replaces all whitespace characters by a single one).
+	 *
+	 * @param s is the string in which the whitespace should be collapsed.
+	 * @return a copy of s with collapsed whitespace.
+	 */
+	static std::string collapse(const std::string &s);
+};
+
+}
+
+#endif /* _OUSIA_WHITESPACE_HPP_ */
+