Support lgathered and rgathered math environments

* src/mathed/math_splitinset.C
	(MathSplitInset::validate): Only require amsmath for AMS stuff

	* src/mathed/math_factory.C
	(createMathInset): create MathSplitInset if the latexkey is "split"

	* src/mathed/math_parser.C
	(Parser::parse1): create MathSplitInset if the latexkey is "split"

	* lib/symbols: Add aligned, gathered, lgathered and rgathered


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/branches/BRANCH_1_4_X@15227 a592a061-630c-0410-9148-cb99ea01b6c8

lib/symbols

@@ -87,6 +87,14 @@ smallmatrix       matrix      none
 vmatrix           matrix      none
 CD                matrix      none
 
+# split environments with optional valign argument.
+# the others (split and alignedat) are hardcoded.
+aligned           split       none
+gathered          split       none
+# from Morten H\o gholm's mathtools.sty:
+lgathered         split       none
+rgathered         split       none
+
 # references
 pageref           ref         none
 prettyref         ref         none

src/mathed/math_factory.C

@@ -276,6 +276,8 @@ MathAtom createMathInset(string const & s)
 			return MathAtom(new MathFontOldInset(l));
 		if (inset == "matrix")
 			return MathAtom(new MathAMSArrayInset(s));
+		if (inset == "split")
+			return MathAtom(new MathSplitInset(s));
 		return MathAtom(new MathSymbolInset(l));
 	}
 

src/mathed/math_parser.C

@@ -1178,6 +1178,18 @@ void Parser::parse1(MathGridInset & grid, unsigned flags,
 				if (l->inset == "matrix") {
 					cell->push_back(createMathInset(name));
 					parse2(cell->back(), FLAG_END, mode, false);
+				} else if (l->inset == "split") {
+					string const valign = parse_verbatim_option() + 'c';
+					cell->push_back(MathAtom(new MathSplitInset(name, valign[0])));
+					parse2(cell->back(), FLAG_END, mode, false);
+				} else {
+					dump();
+					lyxerr << "found math environment `" << name
+					       << "' in symbols file with unsupported inset `"
+					       << l->inset << "'." << endl;
+					// create generic environment inset
+					cell->push_back(MathAtom(new MathEnvInset(name)));
+					parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
 				}
 			}
 

src/mathed/math_splitinset.C

@@ -109,6 +109,8 @@ void MathSplitInset::infoize(std::ostream & os) const
 
 void MathSplitInset::validate(LaTeXFeatures & features) const
 {
-	features.require("amsmath");
-	MathNestInset::validate(features);
+	if (name_ == "split" || name_ == "gathered" || name_ == "aligned" ||
+	    name_ == "alignedat")
+		features.require("amsmath");
+	MathGridInset::validate(features);
 }

status.14x

@@ -36,6 +36,8 @@ What's new
 - Parse the optional argument of the AMS math environments aligned, gathered
   and alignedat.
 
+- Support lgathered and rgathered math environments.
+
 * User Interface:
 
 - Fix a crash that occured on exit if the clipboard was not empty (only on