Hi Aditya,
I made a mathstyle mechanism ... used in fences first:
\starttext
\startTEXpage[offset=1ex]
\def\TestMe#1%
{\NC \ttbf #1
\NC \ruledhbox{$\setupmathstyle[#1]x + x_j^2 + x_i^{e^2} + \frac{1}{x}$}
\NC \ruledhbox{$\setupmathstyle[#1,small]x + x_j^2 + x_i^{e^2} +
\frac{1}{x}$}
\NC \NR}
\starttabulate[|l|r|l|]
\HL
\NC \NC \NC \ttbf ...,small \NC \NR
\HL
\TestMe{text}
\TestMe{text,cramped}
\TestMe{script}
\TestMe{script,cramped}
\TestMe{scriptscript}
\TestMe{scriptscript,cramped}
\TestMe{display}
\TestMe{display,cramped}
\HL
\stoptabulate
\stopTEXpage
\startTEXpage
$x\begingroup\setupmathstyle[script]x\endgroup x$ \par
$x{\setupmathstyle[script]x}x$ \par
$x\startmathstyle[script]x\stopmathstyle x$
\stopTEXpage
\definemathfence [scriptbracket] [bracket]
[command=yes,color=red,mathstyle=script]
\definemathfence [smallbracket] [bracket]
[command=yes,color=green,mathstyle=small]
\definemathfence [normalbracket] [bracket] [command=yes,color=blue]
\startTEXpage[offset=1ex]
\startbuffer
test
$a\frac{1}{normal}\scriptbracket{\frac{1}{script}}\normalbracket{\frac{1}{normal}}\smallbracket{\frac{1}{small}}c$
test \par
\stopbuffer
\getbuffer \setupmathfences [color=red] \getbuffer
\stopTEXpage
\stoptext
\starttext
\definemathfence [fancybracket] [bracket] [command=yes,color=blue]
test $|x|$ test \par
test $||x||$ test (okay) \par
test $a\left|\frac{1}{b}\right|c$ test \par
test $a\left||\frac{1}{b}\right||c$ test (not okay) \par
\startbuffer
test $a\fenced[bar]{\frac{1}{b}}c$ test \par
test $a\fenced[doublebar]{\frac{1}{b}}c$ test \par
test $a\fenced[bracket]{\frac{1}{b}}c$ test \par
test $a\fancybracket{\frac{1}{b}}c$ test \par
\stopbuffer
\getbuffer \setupmathfences [color=red] \getbuffer
\stoptext
Hans
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