9 files changed, 134 insertions, 36 deletions
diff --git a/tex/context/base/cont-new.mkiv b/tex/context/base/cont-new.mkiv
index 6c39a564d..be47d5d52 100644
--- a/tex/context/base/cont-new.mkiv
+++ b/tex/context/base/cont-new.mkiv
@@ -11,7 +11,7 @@
 %C therefore copyrighted by \PRAGMA. See mreadme.pdf for
 %C details.
 
-\newcontextversion{2013.08.24 13:59}
+\newcontextversion{2013.08.26 12:08}
 
 %D This file is loaded at runtime, thereby providing an excellent place for
 %D hacks, patches, extensions and new features.
diff --git a/tex/context/base/context-version.pdf b/tex/context/base/context-version.pdf
index 53c81e050..c45b138af 100644
--- a/tex/context/base/context-version.pdf
+++ b/tex/context/base/context-version.pdf
diff --git a/tex/context/base/context.mkiv b/tex/context/base/context.mkiv
index 39b48487d..08493a92c 100644
--- a/tex/context/base/context.mkiv
+++ b/tex/context/base/context.mkiv
@@ -25,7 +25,7 @@
 %D up and the dependencies are more consistent.
 
 \edef\contextformat {\jobname}
-\edef\contextversion{2013.08.24 13:59}
+\edef\contextversion{2013.08.26 12:08}
 \edef\contextkind   {beta}
 
 %D For those who want to use this:
diff --git a/tex/context/base/math-fen.mkiv b/tex/context/base/math-fen.mkiv
index 2a05ac5a1..8d8ad7ae7 100644
--- a/tex/context/base/math-fen.mkiv
+++ b/tex/context/base/math-fen.mkiv
@@ -78,8 +78,11 @@
 \let\fence \relax
 \let\fenced\relax
 
+\newcount\c_math_fenced_nesting
+
 \unexpanded\def\math_fenced_fenced_start#1%
-  {\begingroup
+  {\advance\c_math_fenced_nesting\plusone
+   \begingroup
    \edef\currentmathfence{#1}%
    \startusemathstyleparameter\mathfenceparameter
    \let\fence\math_fenced_middle
@@ -97,7 +100,8 @@
   {\edef\currentmathfence{#1}%
    \math_fenced_right
    \stopusemathstyleparameter
-   \endgroup}
+   \endgroup
+   \advance\c_math_fenced_nesting\minusone}
 
 \unexpanded\def\math_fenced_fenced[#1]#2%
   {\math_fenced_fenced_start{#1}%
@@ -319,6 +323,46 @@
 % \definemathoverextensible [top] [hoed]  ["FE302]
 % \definemathoverextensible [top] [slang] ["FE303]
 
+%D This is needed for mathml (used in mrow, so it gets reset):
+
+\let\math_fences_saved_left  \left
+\let\math_fences_saved_middle\middle
+\let\math_fences_saved_right \right
+
+\unexpanded\def\math_fences_checked_left
+  {\math_fences_saved_left}
+
+\unexpanded\def\math_fences_checked_middle
+  {\ifcase\c_math_fenced_nesting
+     \expandafter\math_fences_saved_middle
+   \else
+     \expandafter\firstofoneargument
+   \fi}
+
+\unexpanded\def\math_fences_checked_right
+  {\ifcase\c_math_fenced_nesting
+     \expandafter\firstofoneargument
+   \else
+     \expandafter\math_fences_saved_right
+   \fi}
+
+\unexpanded\def\math_fences_finish
+  {\ifcase\c_math_fenced_nesting\else
+     \right.\relax % error, todo: nil spacing
+     \expandafter\math_fences_finish
+   \fi}
+
+\unexpanded\def\startcheckedfences
+  {\begingroup
+  %\let\left  \math_fences_checked_left
+   \let\middle\math_fences_checked_middle
+   \let\right \math_fences_checked_right
+   \c_math_fenced_nesting\zerocount}
+
+\unexpanded\def\stopcheckedfences
+  {\math_fences_finish
+   \endgroup}
+
 %D The next characters were used for constructing nicer extensibles but
 %D nowadays we have real characters.
 
diff --git a/tex/context/base/status-files.pdf b/tex/context/base/status-files.pdf
index 1ce9862cb..bb7e9df66 100644
--- a/tex/context/base/status-files.pdf
+++ b/tex/context/base/status-files.pdf
diff --git a/tex/context/base/status-lua.log b/tex/context/base/status-lua.log
index f4469c869..3e9340ec2 100644
--- a/tex/context/base/status-lua.log
+++ b/tex/context/base/status-lua.log
@@ -1,6 +1,6 @@
 (cont-yes.mkiv
 
-ConTeXt  ver: 2013.08.24 13:59 MKIV beta  fmt: 2013.8.24  int: english/english
+ConTeXt  ver: 2013.08.26 12:08 MKIV beta  fmt: 2013.8.26  int: english/english
 
 system          > 'cont-new.mkiv' loaded
 (cont-new.mkiv)
diff --git a/tex/context/base/syst-aux.lua b/tex/context/base/syst-aux.lua
index b0fb8483b..f9c0dfc1c 100644
--- a/tex/context/base/syst-aux.lua
+++ b/tex/context/base/syst-aux.lua
@@ -16,7 +16,8 @@ local commands, context = commands, context
 local settings_to_array = utilities.parsers.settings_to_array
 local format = string.format
 local utfsub = utf.sub
-local P, C, Carg, lpegmatch, utf8char = lpeg.P, lpeg.C, lpeg.Carg, lpeg.match, lpeg.patterns.utf8char
+local P, S, C, Cc, Cs, Carg, lpegmatch, utf8char = lpeg.P, lpeg.S, lpeg.C, lpeg.Cc, lpeg.Cs, lpeg.Carg, lpeg.match, lpeg.patterns.utf8char
+
 
 local setvalue = context.setvalue
 
@@ -78,3 +79,23 @@ end
 
 -- \gdef\setpercentdimen#1#2%
 --   {#1=\ctxcommand{percentageof("#2",\number#1)}\relax}
+
+local spaces = P(" ")^0/""
+
+local pattern = Cs(
+    ( P("global") / "\\global" )^0
+  * spaces
+  * ( P("unexpanded") / "\\unexpanded" )^0
+  * spaces
+  * Cc("\\expandafter\\")
+  * spaces
+  * ( P("expanded") / "e" )^0
+  * spaces
+  * ( P((1-S(" #"))^1) / "def\\csname %0\\endcsname" )
+  * spaces
+  * Cs( (P("##")/"#" + P(1))^0 )
+)
+
+function commands.thetexdefinition(str)
+    context(lpegmatch(pattern,str))
+end
diff --git a/tex/context/base/syst-aux.mkiv b/tex/context/base/syst-aux.mkiv
index 542b132ae..79560892b 100644
--- a/tex/context/base/syst-aux.mkiv
+++ b/tex/context/base/syst-aux.mkiv
@@ -3122,6 +3122,63 @@
 
 \def\s!unexpanded{unexpanded}
 
+% \bgroup \obeylines
+%
+% \global\let\stoptexdefinition\relax
+%
+% \unexpanded\gdef\starttexdefinition%
+%   {\bgroup%
+%    \obeylines%
+%    \syst_helpers_start_tex_definition}
+%
+% \gdef\syst_helpers_start_tex_definition #1
+%   {\catcode\endoflineasciicode\ignorecatcode%
+%    \doifinstringelse\letterhash{\detokenize{#1}}\syst_helpers_start_tex_definition_yes\syst_helpers_start_tex_definition_nop#1
+%   }
+%
+% \gdef\syst_helpers_start_tex_definition_yes#1 #2
+%   {\edef\texdefinitionname{#1}%
+%    \ifx\texdefinitionname\s!unexpanded%
+%      \expandafter\syst_helpers_start_tex_definition_yes_unexpanded%
+%    \else%
+%      \expandafter\syst_helpers_start_tex_definition_yes_normal%
+%    \fi%
+%    {#1}#2
+%    }
+%
+% \gdef\syst_helpers_start_tex_definition_yes_unexpanded#1#2 #3
+%                                        #4\stoptexdefinition%
+%   {\egroup% #1=unexpanded
+%    \unexpanded\expandafter\def\csname#2\endcsname#3{#4}}
+%
+% \gdef\syst_helpers_start_tex_definition_yes_normal#1#2
+%                                     #3\stoptexdefinition%
+%   {\egroup%
+%    \expandafter\def\csname#1\endcsname#2{#3}}
+%
+% \gdef\syst_helpers_start_tex_definition_nop#1
+%   {\syst_helpers_start_tex_definition_nop_indeed{#1}{}}
+%
+% \gdef\syst_helpers_start_tex_definition_nop_indeed#1#2#3\stoptexdefinition%
+%   {\egroup%
+%    \expandafter\def\csname#1\endcsname{#3}}
+%
+% \egroup
+
+% \starttexdefinition unexpanded test #1
+%     [here #1]
+% \stoptexdefinition
+%
+% \starttexdefinition global unexpanded test
+%     [here test]
+% \stoptexdefinition
+%
+% \scratchcounter=123
+%
+% \starttexdefinition global unexpanded expanded test #oeps
+%     [here #oeps: \the\scratchcounter]
+% \stoptexdefinition
+
 \bgroup \obeylines
 
 \global\let\stoptexdefinition\relax
@@ -3129,39 +3186,15 @@
 \unexpanded\gdef\starttexdefinition%
   {\bgroup%
    \obeylines%
-   \syst_helpers_start_tex_definition}
+   \syst_helpers_start_tex_definition_one}
 
-\gdef\syst_helpers_start_tex_definition #1
+\gdef\syst_helpers_start_tex_definition_one#1
   {\catcode\endoflineasciicode\ignorecatcode%
-   \doifinstringelse\letterhash{\detokenize{#1}}\syst_helpers_start_tex_definition_yes\syst_helpers_start_tex_definition_nop#1
-  }
-
-\gdef\syst_helpers_start_tex_definition_yes#1 #2
-  {\edef\texdefinitionname{#1}%
-   \ifx\texdefinitionname\s!unexpanded%
-     \expandafter\syst_helpers_start_tex_definition_yes_unexpanded%
-   \else%
-     \expandafter\syst_helpers_start_tex_definition_yes_normal%
-   \fi%
-   {#1}#2
-   }
-
-\gdef\syst_helpers_start_tex_definition_yes_unexpanded#1#2 #3
-                                       #4\stoptexdefinition%
-  {\egroup% #1=unexpanded
-   \unexpanded\expandafter\def\csname#2\endcsname#3{#4}}
-
-\gdef\syst_helpers_start_tex_definition_yes_normal#1#2
-                                    #3\stoptexdefinition%
-  {\egroup%
-   \expandafter\def\csname#1\endcsname#2{#3}}
-
-\gdef\syst_helpers_start_tex_definition_nop#1
-  {\syst_helpers_start_tex_definition_nop_indeed{#1}{}}
+   \syst_helpers_start_tex_definition_two{#1}}
 
-\gdef\syst_helpers_start_tex_definition_nop_indeed#1#2#3\stoptexdefinition%
+\gdef\syst_helpers_start_tex_definition_two#1#2\stoptexdefinition%
   {\egroup%
-   \expandafter\def\csname#1\endcsname{#3}}
+   \ctxcommand{thetexdefinition("#1")}{#2}}
 
 \egroup
 
diff --git a/tex/generic/context/luatex/luatex-fonts-merged.lua b/tex/generic/context/luatex/luatex-fonts-merged.lua
index b39d4a8f3..5e00629ef 100644
--- a/tex/generic/context/luatex/luatex-fonts-merged.lua
+++ b/tex/generic/context/luatex/luatex-fonts-merged.lua
@@ -1,6 +1,6 @@
 -- merged file : luatex-fonts-merged.lua
 -- parent file : luatex-fonts.lua
--- merge date  : 08/24/13 13:59:18
+-- merge date  : 08/26/13 12:08:27
 
 do -- begin closure to overcome local limits and interference