tree 078280d7b55ada2746a90840d40f1465cd3972c0
parent 3af9fdfc844dac50128ee7d34b0a67e0f5ace8f9
author Hans Boehm <hboehm@google.com> 1433983563 -0700
committer Hans Boehm <hboehm@google.com> 1434665458 -0700

Rework the key insertion logic

Bug: 21495243

This changes the behavior to be much more compatible with L.

We generally do not allow consecutive binary operators to be inserted.
In the case of a minus operator however, the logic is more complicated.
We do allow a minus after multiplication, division and power.
When the minus is explicitly entered, so the user sees our corrections,
we do not allow a minus after additive operators.  In pasted text,
we do.

We no longer reject additions that would result in implicit
multiplications.  We do immediately reject binary operators in leading
contexts, e.g. after a left parenthesis, in which they must result in
a syntax error.

Change-Id: I1d35d74335371f6f113808d68a4f293b699d9bd0