Add clientside translations.

src/translation.cpp

@@ -0,0 +1,146 @@
+/*
+Minetest
+Copyright (C) 2017 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.
+*/
+
+#include "translation.h"
+#include "log.h"
+#include "util/string.h"
+
+static Translations main_translations;
+Translations *g_translations = &main_translations;
+
+Translations::~Translations()
+{
+	clear();
+}
+
+void Translations::clear()
+{
+	m_translations.clear();
+}
+
+const std::wstring &Translations::getTranslation(
+		const std::wstring &textdomain, const std::wstring &s)
+{
+	std::wstring key = textdomain + L"|" + s;
+	try {
+		return m_translations.at(key);
+	} catch (std::out_of_range) {
+		warningstream << "Translations: can't find translation for string \""
+		              << wide_to_utf8(s) << "\" in textdomain \""
+		              << wide_to_utf8(textdomain) << "\"" << std::endl;
+		// Silence that warning in the future
+		m_translations[key] = s;
+		return s;
+	}
+}
+
+void Translations::loadTranslation(const std::string &data)
+{
+	std::istringstream is(data);
+	std::wstring textdomain;
+	std::string line;
+
+	while (is.good()) {
+		std::getline(is, line);
+		if (str_starts_with(line, "# textdomain:")) {
+			textdomain = utf8_to_wide(trim(str_split(line, ':')[1]));
+		}
+		if (line.empty() || line[0] == '#')
+			continue;
+
+		std::wstring wline = utf8_to_wide(line);
+		if (wline.empty())
+			continue;
+
+		// Read line
+		// '=' marks the key-value pair, but may be escaped by an '@'.
+		// '\n' may also be escaped by '@'.
+		// All other escapes are preserved.
+
+		size_t i = 0;
+		std::wostringstream word1, word2;
+		while (i < wline.length() && wline[i] != L'=') {
+			if (wline[i] == L'@') {
+				if (i + 1 < wline.length()) {
+					if (wline[i + 1] == L'=') {
+						word1.put(L'=');
+					} else {
+						word1.put(L'@');
+						word1.put(wline[i + 1]);
+					}
+					i += 2;
+				} else {
+					// End of line, go to the next one.
+					word1.put(L'\n');
+					if (!is.good()) {
+						break;
+					}
+					i = 0;
+					std::getline(is, line);
+					wline = utf8_to_wide(line);
+				}
+			} else {
+				word1.put(wline[i]);
+				i++;
+			}
+		}
+
+		if (i == wline.length()) {
+			errorstream << "Malformed translation line \"" << line << "\""
+			            << std::endl;
+			continue;
+		}
+		i++;
+
+		while (i < wline.length()) {
+			if (wline[i] == L'@') {
+				if (i + 1 < wline.length()) {
+					if (wline[i + 1] == L'=') {
+						word2.put(L'=');
+					} else {
+						word2.put(L'@');
+						word2.put(wline[i + 1]);
+					}
+					i += 2;
+				} else {
+					// End of line, go to the next one.
+					word2.put(L'\n');
+					if (!is.good()) {
+						break;
+					}
+					i = 0;
+					std::getline(is, line);
+					wline = utf8_to_wide(line);
+				}
+			} else {
+				word2.put(wline[i]);
+				i++;
+			}
+		}
+
+		std::wstring oword1 = word1.str(), oword2 = word2.str();
+		if (oword2.empty()) {
+			oword2 = oword1;
+			errorstream << "Ignoring empty translation for \""
+			            << wide_to_utf8(oword1) << "\"" << std::endl;
+		}
+
+		m_translations[textdomain + L"|" + oword1] = oword2;
+	}
+}