some less language hardcoding

lib/languages

@@ -21,6 +21,7 @@
 #	PostBabelPreamble
 #	  <extra latex code inserted after babel>
 #	EndPostBabelPreamble
+#	Requires           <requirement>
 # End
 #
 #
@@ -261,6 +262,7 @@ Language chinese-simplified
 	GuiName          "Chinese (simplified)"
 	Encoding         euc-cn
 	LangCode         zh_CN
+	Requires         CJK
 End
 
 # uses CJK package
@@ -268,6 +270,7 @@ Language chinese-traditional
 	GuiName         "Chinese (traditional)"
 	Encoding        utf8-cjk
 	LangCode        zh_CN
+	Requires         CJK
 End
 
 # not supported by babel
@@ -513,6 +516,7 @@ Language japanese
 	Encoding         jis-plain
 	LangCode         ja_JP
 	AsBabelOptions   true
+	Requires         japanese
 End
 
 # uses CJK package
@@ -520,6 +524,7 @@ Language japanese-cjk
 	GuiName         "Japanese (CJK)"
 	Encoding        euc-jp
 	LangCode        ja_JP
+	Requires        CJK
 End
 
 # not yet supported by polyglossia
@@ -534,6 +539,7 @@ Language korean
 	GuiName         "Korean"
 	Encoding        euc-kr
 	LangCode        ko_KR
+	Requires        CJK
 End
 
 # not supported by babel
@@ -873,6 +879,7 @@ Language vietnamese
 	Encoding         utf8
 	LangCode         vi_VN
 	AsBabelOptions   true
+	Requires         vietnamese
 End
 
 Language welsh

src/BufferParams.cpp

@@ -1250,10 +1250,8 @@ void BufferParams::validate(LaTeXFeatures & features) const
 		|| useNonTeXFonts))
 		features.require("polyglossia");
 
-	if (language->lang() == "vietnamese")
+	if (!language->requires().empty())
-		features.require("vietnamese");
+		features.require(language->requires());
-	else if (language->lang() == "japanese")
-		features.require("japanese");
 }
 
 
@@ -2688,9 +2686,6 @@ void BufferParams::writeEncodingPreamble(otexstream & os,
 		// If the "japanese" package (i.e. pLaTeX) is used,
 		// inputenc must be omitted.
 		// see http://www.mail-archive.com/lyx-devel@lists.lyx.org/msg129680.html
-		if (package == Encoding::japanese)
-		     features.require("japanese");
-
 		if ((!encodings.empty() || package == Encoding::inputenc)
 		    && !features.isRequired("japanese")) {
 			os << "\\usepackage[";

src/LaTeXFeatures.cpp

@@ -453,8 +453,8 @@ void LaTeXFeatures::useLanguage(Language const * lang)
 {
 	if (!lang->babel().empty())
 		UsedLanguages_.insert(lang);
-	if (lang->lang() == "vietnamese")
+	if (!lang->requires().empty())
-		require("vietnamese");
+		require(lang->requires());
 	// CJK languages do not have a babel name.
 	// They use the CJK package
 	if (lang->encoding()->package() == Encoding::CJK)

src/Language.cpp

@@ -74,6 +74,7 @@ bool Language::readLanguage(Lexer & lex)
 		LA_POLYGLOSSIAOPTS,
 		LA_POSTBABELPREAMBLE,
 		LA_PREBABELPREAMBLE,
+		LA_REQUIRES,
 		LA_RTL
 	};
 
@@ -91,6 +92,7 @@ bool Language::readLanguage(Lexer & lex)
 		{ "polyglossiaopts",      LA_POLYGLOSSIAOPTS },
 		{ "postbabelpreamble",    LA_POSTBABELPREAMBLE },
 		{ "prebabelpreamble",     LA_PREBABELPREAMBLE },
+		{ "requires",             LA_REQUIRES },
 		{ "rtl",                  LA_RTL }
 	};
 
@@ -152,6 +154,9 @@ bool Language::readLanguage(Lexer & lex)
 			babel_presettings_ =
 				lex.getLongString("EndPreBabelPreamble");
 			break;
+		case LA_REQUIRES:
+			lex >> requires_;
+			break;
 		case LA_RTL:
 			lex >> rightToLeft_;
 			break;

src/Language.h

@@ -40,6 +40,8 @@ public:
 	std::string const & polyglossia() const { return polyglossia_name_; }
 	/// polyglossia language options
 	std::string const & polyglossiaOpts() const { return polyglossia_opts_; }
+	/// requirement (package, function)
+	std::string const & requires() const { return requires_; }
 	/// translatable GUI name
 	std::string const & display() const { return display_; }
 	/// is this a RTL language?
@@ -93,6 +95,8 @@ private:
 	///
 	std::string polyglossia_opts_;
 	///
+	std::string requires_;
+	///
 	std::string display_;
 	///
 	bool rightToLeft_;