[NTG-context] extentable arrows

[Aditya Mahajan]

On Wed, 28 Jun 2006, Taco Hoekwater wrote:

> Aditya Mahajan wrote:
>> \xrightarrow{big superscipt}
>>
>> Any suggestions?
>
>
> Not completely identical, but similar.

The syntax can be made identical (even better) than that of amsmath.

\def\xrightarrow{\dosingleempty\doxrightarrow}

\def\xleftarrow {\dosingleempty\doxleftarrow}

\def\doxrightarrow[#1]{\dodoublegroupempty\dodoxrightarrow{#1}}

\def\doxleftarrow[#1]{\dodoublegroupempty\dodoxleftarrow{#1}}

\def\dodoxrightarrow#1#2{\mathrel
    {{\domthxarr0359\rightarrowfill{#1}{#2}}}}

\def\dodoxleftarrow#1#2{\mathrel
    {{\domthxarr3095\leftarrowfill{#1}{#2}}}}

\starttext
  $$
  A \xrightarrow[]{stuff on top} B
  $$

$$
A \xrightarrow[stuff below]{} B
$$

\startformula
  A \xleftarrow[stuff below]{stuff on top} B
\stopformula

  $$
  A \xleftarrow B
  $$
$$
  \rightarrow A \xrightarrow{stuff on top} B \leftarrow
$$


$$
  \rightarrow A \xleftarrow[stuff below] B \leftarrow
$$

  \stoptext


Will make copy paste a bit easier! Though these days I find myself 
writing more in context and soon will face the reverse problem. I will 
need to copy context math into latex (needed for final journal 
submission) and some of the math features are simply missing from 
latex :)

Aditya