Fix handling of brackets following greek symbols (or more generally '…

…backslashnames') following sub- or superscript characters.

cmake/version.cmake

@@ -1,6 +1,6 @@
 set(CADABRA_VERSION_MAJOR 2)
 set(CADABRA_VERSION_MINOR 5)
-set(CADABRA_VERSION_PATCH 6)
+set(CADABRA_VERSION_PATCH 7)
 set(CADABRA_VERSION_TWEAK 0)
 set(CADABRA_VERSION_SEM   ${CADABRA_VERSION_MAJOR}.${CADABRA_VERSION_MINOR}.${CADABRA_VERSION_PATCH})
 set(COPYRIGHT_YEARS "2001-2024")

core/Parser.cc

@@ -27,7 +27,7 @@ You should have received a copy of the GNU General Public License
 #include <iostream>
 #include <typeinfo>
 
-//#define DEBUG 1
+// #define DEBUG 1
 
 std::istream& operator>>(std::istream& str, cadabra::Parser& pa)
 	{
@@ -394,6 +394,19 @@ bool Parser::string2tree(const std::string& inp)
 					tmp.clear();
 					break;
 					}
+				if(is_opening_bracket(c)!=str_node::b_no) {
+					// This happens with e.g. `\partial_\theta{f}`. The `\theta`
+					// is a backslashname, and should be terminated as soon as
+					// the opening brace is found. If you want the whole thing
+					// to go into the subscript you should use `\partial_{\theta{f}}`
+					// and that will then not trigger backslashname (just ordinary name).
+					current_mode.pop_back();
+					tree->append_child(current_parent,str_node(tmp,
+					                   current_bracket.back(),
+					                   current_parent_rel.back()));
+					tmp.clear();
+					break;
+					}
 				tmp+=c;
 				advance(i);
 				if(c=='\"')

tests/basic.cdb

@@ -392,3 +392,13 @@ def test42():
        print("Test 42b passed")
 
 test42()
+
+def test43():
+    ex:=\partial_\theta{A};
+    tst:= \partial_{\theta}{A} - @(ex);
+    assert(tst==0)
+    print("Test 43 passed")
+
+test43()
+
+

web2/cadabra2/source/changelog.html

@@ -13,16 +13,32 @@ <h1>Change log</h1>
   the code level, consult
   the <a href="http://github.com/kpeeters/cadabra2">github
   repository</a>. Odd patch levels correspond to versions in
-  development, even numbered ones are released in packaged form.
+  development which you can only get by building from source, while
+  even-numbered ones are released in packaged/installer form.
 </p>
-<a name="microtex"></a>
-<h3>github microtex branch (2.5.x)</h3>
+<a name="devel"></a>
+<h3>github devel branch (2.5.7)</h3>
 <ul>
+  <li>Fix handling of spurious backslashes
+  (<a href="https://github.com/kpeeters/cadabra2/issues/240">#240</a>)
+  and double backslashes
+  (<a href="https://github.com/kpeeters/cadabra2/issues/155">#155</a>).</li>
+  <li>Fix handling of backslash names (e.g. Greek characters)
+  appearing without curly brackets as sub- or superscripts
+  (<a href="https://github.com/kpeeters/cadabra2/issues/312">#312</a>).</li>
+  <li>Fix the path to our python files in the Docker container
+  build.</li>
+  <li>When an expression is fed through the sympy bridge, make sure to
+  not remove outer parent relations (so that the expression remains a
+  sub/superscript if it was one before entering the bridge).</li>
 </ul>
 
 <a name="master"></a>
-<h3>github master branch (2.5.2)</h3>
+<h3>2.5.6 (released 29-Sep-2024)</h3>
 <ul>
+  <li>Windows build is working again, now using MSYS2 because that's the only system that provides binary packages of our dependencies and also still carries gtkmm-3.0. An installer is now auto-generated by the CI on every release.</li>
+  <li>Updates to the AppImage build to fix issues with sympy and matplotlib.</li>
+  <li>Many other small fixes and updates to ensure that all binaries can be built by the CI.</li>
 </ul>
 
 <h3>2.5.2 (released 14-Jun-2024)</h3>