Improve selection parsing error reporting
Now the selection parser tracks the part of selection text that
contributes to the current parsing context, and uses that for more
useful error messages. At least in some cases, there is now also
context information for syntax errors, although this could likely be
improved further.
Exception handling during selection parsing is also improved:
- The above context is now added to the exception, similar to what the
old reporting mechanism does.
- The full selection is added to the exception as context, also for
non-interactive parsing.
- More consistent exception handling, e.g., in cases where an exception
is thrown during error handling.
Improve documentation for related functions.
Part of #655.
Change-Id: Ib276ce4e219692c9819e45a1637e3660d958803f
14 files changed: