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/**
* (C) Copyright 2007-2008 Jeremy Maitin-Shepard
*
* Use, modification, and distribution are subject to the terms specified in the
* COPYING file.
**/
define_keymap("universal_argument_keymap");
for (var i = 0; i <= 9; ++i)
define_key(universal_argument_keymap, String(i), universal_argument_keymap, $hook = universal_digit);
define_key(universal_argument_keymap, "subtract", universal_argument_keymap, $hook = universal_negate);
function universal_argument(ctx, active_keymap, overlay_keymap, top_keymap)
{
if (ctx.prefix_argument) {
if (typeof(ctx.prefix_argument) == "object") // must be array
ctx.prefix_argument = [ctx.prefix_argument[0] * 4];
} else
ctx.prefix_argument = [4];
ctx.overlay_keymap = top_keymap;
}
function universal_digit(ctx, active_keymap, overlay_keymap)
{
var digit = ctx.event.charCode - 48;
if (typeof(ctx.prefix_argument) == "object") { // array
if (ctx.prefix_argument[0] < 0)
ctx.prefix_argument = -digit;
else
ctx.prefix_argument = digit;
}
else if (ctx.prefix_argument < 0)
ctx.prefix_argument = ctx.prefix_argument * 10 - digit;
else
ctx.prefix_argument = ctx.prefix_argument * 10 + digit;
ctx.overlay_keymap = overlay_keymap || active_keymap;
}
function universal_negate(ctx, active_keymap, overlay_keymap)
{
if (typeof ctx.prefix_argument == "object")
ctx.prefix_argument[0] = 0 - ctx.prefix_argument[0];
else
ctx.prefix_argument = 0 - ctx.prefix_argument;
ctx.overlay_keymap = overlay_keymap || active_keymap;
}
function bind_universal_argument(keymap, key) {
define_key(keymap, key, universal_argument_keymap, $hook = universal_argument);
}
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