Merge branch 'master' into vadz-doxygen

* master:
  Add Octave 4.4 to Travis allow_failures
  Fixes for appveyor image changes
  Javascript test-suite Makefile parallel jobs
  Add changes entry for csconstruct, dconstruct and javaconstruct fix
  Fix lookup of csconstruct, dconstructor and javaconstruct typemaps
  Javascript %nspace fix in generated C++ code
  Add C++17 documentation chapter
  Add changes notes for C++17 nested namespaces support
  Test for invalid C++17 nested namespace aliases
  Test c++17 nested namespaces and %nspace
  Add c++17 nested namespaces runtime test for C#
  Add c++17 nested namespaces runtime test for Python
  Add support for c++17 nested namespaces
  Update CHANGES.current
  .travis.yml: test against Octave 4.4
  Examples/test-suite/register_par.i: rename 'tree' to 'swig_tree'
  Examples/octave/module_load/runme.m: update 'exist()' statements for Octave >= 4.4
  Examples/octave/module_load/runme.m: do not use duplicate function names
  Examples/Makefile.in: unset OCTAVE_PATH when running Octave for tests
  Lib/octave: fix getting/setting global variables for Octave >= 4.4
  Lib/octave: use new class for function member dereference with Octave >= 4.4
  Lib/octave: fix operator installation for Octave >= 4.4
  Lib/Octave: in Octave >= 4.4, assign reference to base class in subclass
  Lib/octave: fix call to mlock() for Octave >= 4.4
  Lib/octave: fix call to octave::call_stack::current() for Octave >= 4.4
  Lib/octave: 'octave_exit' not longer exists in Octave >= 4.4
  Lib/octave: replace is_bool_type() with islogical() for Octave >= 4.4
  Lib/octave: replace is_numeric_type() with isnumeric() for Octave >= 4.4
  Lib/octave: replace is_cell() with iscell() for Octave >= 4.4
  Lib/octave: call octave::feval() instead of feval() for Octave >= 4.4
  Lib/octave: fix function name passed to unwind_protect::begin_frame()
  C#, D, Java methodmodifiers on destructors
  Javascript assert.h - move to header section
  Appveyor cl compiler warning fixes during configure
  Java vector wrappers cast correction
  test-suite fixes (Java directors) for compilers that don't support varargs
  Go - use director.swg like other languages
  test-suite fixes (2) for compilers that don't support varargs
  Consistent spacing in generated exception specifications
  test-suite fixes for compilers that don't support vararg macros
  Enhance Travis testing to use gcc 8 and test C++17 and C17
  Enhance SWIG_isfinite for older standards: C++03/C++98/C89
  test-suite support for gcc-8 targeting C++11 and C++14
  Scilab portability fixes - remove use of strdup
  Scilab array overbounds fix handling char type exceptions
  test-suite fix for c++17 and throw macro
  Remove use of 'register' in C source
  test-suite support for C++17: switch testing of the deprecated C++17 'register' keyword from C++ to C
  Examples update to support C++17: exception specification throw removal
  Cosmetic syntax tweak using throw in Octave directors
  test-suite support for C++17 (Java): exception specification throw removal
  test-suite support for C++17: exception specification throw removal
  __cplusplus macro usage tweak
  Improve detection of Python's 2to3 tool
  Correct C shared library creation when specifing CC to configure
  Remove superfluous parens in generated Python scripts.
  [ci] guile 2.2 build no longer expected to fail
  guile - resstructure some configure tests
  Disable guile configuration if guile-config and guile report a different version
  Fix guile executable detection on early 2.0.x guile versions
  guile - drop GDB_INTERFACE related stuff
  guile - replace obsolete scm_listify with scm_list_n
  guile - use more reliable method of finding guile executable based on guile-config
  Fix go version matching in configure for go1.10
  [Python] Suppress new pycodestyle warning
  Add if-no-present action for jsv8inc arg
  Fix typo in help --with-jscoreinc and --with-jscorelib
  Fix off-by-one error
  * Makefile.in (configfiles): Update URLs for latest configfiles.
  Add changes entry for Ruby %alias fix for global functions
  [Ruby] Pass Qnil instead of NULL to rb_funcall()
  Fix typo
  Fix ruby %alias directive for native c functions
  Stop testing Python on Appveyor msys/mingw
  Fix -Wimplicit-fallthrough gcc-7.3 warning

1 files changed, 52 insertions, 23 deletions

diff --git a/Source/CParse/parser.y b/Source/CParse/parser.y
index 3152882f0..46a106c47 100644
--- a/Source/CParse/parser.y
+++ b/Source/CParse/parser.y
@@ -4465,32 +4465,61 @@ cpp_using_decl : USING idcolon SEMI {
 
 cpp_namespace_decl : NAMESPACE idcolon LBRACE { 
                 Hash *h;
-                $1 = Swig_symbol_current();
-		h = Swig_symbol_clookup($2,0);
-		if (h && ($1 == Getattr(h,"sym:symtab")) && (Strcmp(nodeType(h),"namespace") == 0)) {
-		  if (Getattr(h,"alias")) {
-		    h = Getattr(h,"namespace");
-		    Swig_warning(WARN_PARSE_NAMESPACE_ALIAS, cparse_file, cparse_line, "Namespace alias '%s' not allowed here. Assuming '%s'\n",
-				 $2, Getattr(h,"name"));
-		    $2 = Getattr(h,"name");
+		Node *parent_ns = 0;
+		List *scopes = Swig_scopename_tolist($2);
+		int ilen = Len(scopes);
+		int i;
+
+/*
+Printf(stdout, "==== Namespace %s creation...\n", $2);
+*/
+		$<node>$ = 0;
+		for (i = 0; i < ilen; i++) {
+		  Node *ns = new_node("namespace");
+		  Symtab *current_symtab = Swig_symbol_current();
+		  String *scopename = Getitem(scopes, i);
+		  Setattr(ns, "name", scopename);
+		  $<node>$ = ns;
+		  if (parent_ns)
+		    appendChild(parent_ns, ns);
+		  parent_ns = ns;
+		  h = Swig_symbol_clookup(scopename, 0);
+		  if (h && (current_symtab == Getattr(h, "sym:symtab")) && (Strcmp(nodeType(h), "namespace") == 0)) {
+/*
+Printf(stdout, "  Scope %s [found C++17 style]\n", scopename);
+*/
+		    if (Getattr(h, "alias")) {
+		      h = Getattr(h, "namespace");
+		      Swig_warning(WARN_PARSE_NAMESPACE_ALIAS, cparse_file, cparse_line, "Namespace alias '%s' not allowed here. Assuming '%s'\n",
+				   scopename, Getattr(h, "name"));
+		      scopename = Getattr(h, "name");
+		    }
+		    Swig_symbol_setscope(Getattr(h, "symtab"));
+		  } else {
+/*
+Printf(stdout, "  Scope %s [creating single scope C++17 style]\n", scopename);
+*/
+		    h = Swig_symbol_newscope();
+		    Swig_symbol_setscopename(scopename);
 		  }
-		  Swig_symbol_setscope(Getattr(h,"symtab"));
-		} else {
-		  Swig_symbol_newscope();
-		  Swig_symbol_setscopename($2);
+		  Delete(Namespaceprefix);
+		  Namespaceprefix = Swig_symbol_qualifiedscopename(0);
 		}
-		Delete(Namespaceprefix);
-		Namespaceprefix = Swig_symbol_qualifiedscopename(0);
+		Delete(scopes);
              } interface RBRACE {
-                Node *n = $5;
-		set_nodeType(n,"namespace");
-		Setattr(n,"name",$2);
-                Setattr(n,"symtab", Swig_symbol_popscope());
-		Swig_symbol_setscope($1);
-		$$ = n;
-		Delete(Namespaceprefix);
-		Namespaceprefix = Swig_symbol_qualifiedscopename(0);
-		add_symbols($$);
+		Node *n = $<node>4;
+		Node *top_ns = 0;
+		do {
+		  Setattr(n, "symtab", Swig_symbol_popscope());
+		  Delete(Namespaceprefix);
+		  Namespaceprefix = Swig_symbol_qualifiedscopename(0);
+		  add_symbols(n);
+		  top_ns = n;
+		  n = parentNode(n);
+		} while(n);
+		appendChild($<node>4, firstChild($5));
+		Delete($5);
+		$$ = top_ns;
              } 
              | NAMESPACE LBRACE {
 	       Hash *h;