ebnf-user-arrow

ebnf-user-arrow is a variable defined in `ebnf2ps.el'.
Its value is

nil

Documentation:
Specify a sexp for user arrow shape (a PostScript code).

When evaluated, the sexp should return nil or a string containing PostScript
code. PostScript code should draw a right arrow.

The anatomy of a right arrow is:

...... Initial position
:
: *.................
: | * } }
: | * } hT4 }
v | * } }
======+======*... } hT2
: | *: } }
: | * : } hT4 }
: | * : } }
: *.................
: : :
: : :..........
: : } hT2 }
: :.......... } hT
: } hT2 }
:.......................

Where `hT', `hT2' and `hT4' are predefined PostScript variable names that can
be used to generate your own arrow. As these variables are used along
PostScript execution, *DON'T* modify the values of them. Instead, copy the
values, if you need to modify them.

The relation between these variables is: hT = 2 * hT2 = 4 * hT4.

The variable `ebnf-user-arrow' is only used when `ebnf-arrow-shape' is set to
symbol `user'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 20 of Emacs.