commit 5bada68a9efd894d006d08e0cb2ef459d523e940
author Han Seoul-Oh <laughinghan@gmail.com> Thu Jul 07 11:33:46 2016 -0400
committer GitHub <noreply@github.com> Thu Jul 07 11:33:46 2016 -0400
tree c437eafb8e77c6de41a8287f2deed5832451c4f3
parent 754b816b22d34a602ede1f46386d22132e2d53e8
parent df9baca28a9c0ee17caf5d67dd14bf65854f9273

Merge pull request #659 from dominique-unruh/langle-rangle-vert

Support for brackets \langle,\rangle, \lVert,\rVert

src/commands/math/commands.js

diff --git a/src/commands/math/commands.js b/src/commands/math/commands.js
index 61b89c0..2b9baf8 100644
--- a/src/commands/math/commands.js
+++ b/src/commands/math/commands.js
@@ -688,7 +688,9 @@
   '⟩': '⟨',
   '\\langle ': '\\rangle ',
   '\\rangle ': '\\langle ',
-  '|': '|'
+  '|': '|',
+  '\\lVert ' : '\\rVert ',
+  '\\rVert ' : '\\lVert ',
 };
 
 function bindCharBracketPair(open, ctrlSeq) {
@@ -702,6 +704,8 @@
 LatexCmds.langle = bind(Bracket, L, '⟨', '⟩', '\\langle ', '\\rangle ');
 LatexCmds.rangle = bind(Bracket, R, '⟨', '⟩', '\\langle ', '\\rangle ');
 CharCmds['|'] = bind(Bracket, L, '|', '|', '|', '|');
+LatexCmds.lVert = bind(Bracket, L, '∥', '∥', '\\lVert ', '\\rVert ');
+LatexCmds.rVert = bind(Bracket, R, '∥', '∥', '\\lVert ', '\\rVert ');
 
 LatexCmds.left = P(MathCommand, function(_) {
   _.parser = function() {
@@ -710,13 +714,17 @@
     var succeed = Parser.succeed;
     var optWhitespace = Parser.optWhitespace;
 
-    return optWhitespace.then(regex(/^(?:[([|]|\\\{)/))
-      .then(function(ctrlSeq) { // TODO: \langle, \rangle
+    return optWhitespace.then(regex(/^(?:[([|]|\\\{|\\langle\b|\\lVert\b)/))
+      .then(function(ctrlSeq) {
         var open = (ctrlSeq.charAt(0) === '\\' ? ctrlSeq.slice(1) : ctrlSeq);
+	if (ctrlSeq=="\\langle") { open = '⟨'; ctrlSeq = ctrlSeq + ' '; }
+	if (ctrlSeq=="\\lVert") { open = '∥'; ctrlSeq = ctrlSeq + ' '; }
         return latexMathParser.then(function (block) {
           return string('\\right').skip(optWhitespace)
-            .then(regex(/^(?:[\])|]|\\\})/)).map(function(end) {
+            .then(regex(/^(?:[\])|]|\\\}|\\rangle\b|\\rVert\b)/)).map(function(end) {
               var close = (end.charAt(0) === '\\' ? end.slice(1) : end);
+	      if (end=="\\rangle") { close = '⟩'; end = end + ' '; }
+	      if (end=="\\rVert") { close = '∥'; end = end + ' '; }
               var cmd = Bracket(0, open, close, ctrlSeq, end);
               cmd.blocks = [ block ];
               block.adopt(cmd, 0, 0);

test/unit/latex.test.js

diff --git a/test/unit/latex.test.js b/test/unit/latex.test.js
index 4cf59fa..ab6d925 100644
--- a/test/unit/latex.test.js
+++ b/test/unit/latex.test.js
@@ -85,6 +85,24 @@
     assert.equal(tree.join('latex'), '\\left(123\\right)');
   });
 
+  test('langle/rangle (issue #508)', function() {
+    var tree = latexMathParser.parse('\\left\\langle 123\\right\\rangle)');
+
+    assert.ok(tree.ends[L] instanceof Bracket);
+    var contents = tree.ends[L].ends[L].join('latex');
+    assert.equal(contents, '123');
+    assert.equal(tree.join('latex'), '\\left\\langle 123\\right\\rangle )');
+  });
+
+  test('lVert/rVert', function() {
+    var tree = latexMathParser.parse('\\left\\lVert 123\\right\\rVert)');
+
+    assert.ok(tree.ends[L] instanceof Bracket);
+    var contents = tree.ends[L].ends[L].join('latex');
+    assert.equal(contents, '123');
+    assert.equal(tree.join('latex'), '\\left\\lVert 123\\right\\rVert )');
+  });
+
   test('parens with whitespace', function() {
     assertParsesLatex('\\left ( 123 \\right ) ', '\\left(123\\right)');
   });
@@ -308,5 +326,7 @@
     testCantParse('unmatched close brace', '}', ' 1 + 2 } ', '1 - {2 + 3} }', '\\sqrt{ x }} + \\sqrt{y}');
     testCantParse('unmatched open brace', '{', '1 * { 2 + 3', '\\frac{ \\sqrt x }{{ \\sqrt y}');
     testCantParse('unmatched \\left/\\right', '\\left ( 1 + 2 )', ' [ 1, 2 \\right ]');
+    testCantParse('langlerfish/ranglerfish (checking for confusion with langle/rangle)',
+		    '\\left\\langlerfish 123\\right\\ranglerfish)');
   });
 });