Add colored text (not only colored chat).

Add documentation, move files to a proper place and avoid memory leaks.
Make it work with most kind of texts, and allow backgrounds too.

src/util/enriched_string.h

@@ -0,0 +1,91 @@
+/*
+Copyright (C) 2013 xyz, Ilya Zhuravlev <whatever@xyz.is>
+Copyright (C) 2016 Nore, Nathanaël Courant <nore@mesecons.net>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License along
+with this program; if not, write to the Free Software Foundation, Inc.,
+51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#ifndef ENRICHEDSTRING_HEADER
+#define ENRICHEDSTRING_HEADER
+
+#include <string>
+#include <vector>
+#include <SColor.h>
+
+class EnrichedString {
+public:
+	EnrichedString();
+	EnrichedString(const std::wstring &s,
+		const irr::video::SColor &color = irr::video::SColor(255, 255, 255, 255));
+	EnrichedString(const wchar_t *str,
+		const irr::video::SColor &color = irr::video::SColor(255, 255, 255, 255));
+	EnrichedString(const std::wstring &string,
+		const std::vector<irr::video::SColor> &colors);
+	void operator=(const wchar_t *str);
+	void addAtEnd(const std::wstring &s, const irr::video::SColor &color);
+
+	// Adds the character source[i] at the end.
+	// An EnrichedString should always be able to be copied
+	// to the end of an existing EnrichedString that way.
+	void addChar(const EnrichedString &source, size_t i);
+
+	// Adds a single character at the end, without specifying its
+	// color. The color used will be the one from the last character.
+	void addCharNoColor(wchar_t c);
+
+	EnrichedString substr(size_t pos = 0, size_t len = std::string::npos) const;
+	EnrichedString operator+(const EnrichedString &other) const;
+	void operator+=(const EnrichedString &other);
+	const wchar_t *c_str() const;
+	const std::vector<irr::video::SColor> &getColors() const;
+	const std::wstring &getString() const;
+	inline bool operator==(const EnrichedString &other) const
+	{
+		return (m_string == other.m_string && m_colors == other.m_colors);
+	}
+	inline bool operator!=(const EnrichedString &other) const
+	{
+		return !(*this == other);
+	}
+	inline void clear()
+	{
+		m_string.clear();
+		m_colors.clear();
+		m_has_background = false;
+	}
+	inline bool empty() const
+	{
+		return m_string.empty();
+	}
+	inline size_t size() const
+	{
+		return m_string.size();
+	}
+	inline bool hasBackground() const
+	{
+		return m_has_background;
+	}
+	inline irr::video::SColor getBackground() const
+	{
+		return m_background;
+	}
+private:
+	std::wstring m_string;
+	std::vector<irr::video::SColor> m_colors;
+	bool m_has_background;
+	irr::video::SColor m_background;
+};
+
+#endif