Using keywords for the names of dynamic bindings emphasized their
dynamic nature and how they actually work, but is opaque when it comes
to documentation and error detection. Janet uses early binding for name
resolution by default in most places, dyns should be no different.
The `defdyn` macro allows one to create aliases for keywords that can
have docstrings, be imported and exported, etc. The aliases _must_
follow the usual lisp convention of earmuffs - this is not
restricting since the underlying keyword lookup mechanism is still
completely accessible to users.
Example:
(defdyn *my-dynamic-binding* "Sends the plumbus to the thingamizer when
enabled")
The above creates a normal binding (as created with `def`) for
`*my-dynamic-binding*` that is bound to the keyword
`:my-dynamic-binding`.
There is an optional prefix for defdyns that can be used to avoid name
collisions - *defdyn-prefix*
Example:
(setdyn *defdyn-prefix* "mylib/")
(defdyn *my-dynamic-binding* "Plumbus thingamizer")
(pp *my-dynamic-binding*)
> :mylib/my-dynamic-binding
This is more intuitive and avoids the possibilty of strange code
to resume or cancel a fiber after it was scheduled but before it was
entered for the first time.
The main issue was cancellation of fiber using `cancel` rather than
`ev/cancel` could cause issues with the event loop internal ref count.
Since this is almost certainly bad usage (and is not something I want to
encourage or support), we will warn against trying to resume or error
fibers that have already been suspended or scheduled on the event loop.
The distinction between "task" fibers and normal fibers is now kept by a
flag that is set when a fiber is resumed - if it is the outermost fiber
on the stack, it is considered a root fiber. All fibers scheduled with
ev/go or by the event loop are root fibers, and thus cannot be cancelled
or resumed with `cancel` or `resume` - instead, use `ev/cancel` or
`ev/go`.
Nested expression in the quasiquote were being compiled with the "hint"
flag passed to the expression compilation, essentially telling the
compiler to put intermediates into the final slot, possibly overwriting
other intermediate values. This fix removes that flags on any recursive
calls to quasiquote.
Many system I/O operations can fail due to being interrupted by a
signal. In the REPL's case, this poses a problem because in most cases
it's assumed that a read error is not recoverable and is equivalent to
EOF. This, however, is not the case for EINTR, in which case the I/O
should be tried again.
This commit fixes the most egregious violations of this, notably the
line getters, which would otherwise make the REPL exit on any signal,
even if the signal was caught and processed outside the REPL's purview.
The current destructure pattern ends when '& is encountered.
This commit adds an error if it is followed by more than
a symbol to bind the array to.
Although its not critical since the extra items can be ignored,
they're a sign of some kind of mistake so its best to complain.
In destructure janet_type(_) == JANET_SYMBOL was used to check if a
value was a symbol.
This commit replaces that with the janet_checktype function,
because that function is used for the same purpose in other places.
This commit adds three checks to ensure & rest patterns are valid:
1. When checking for '& ensure the value is a symbol before unwrapping
2. Make sure '& is followed by a value
3. Make sure the value following '& is a symbol
This commit adds support for using & _ syntax to bind the remaining
values in an array in the match macro.
The commit also adds a few tests for the new syntax in suite0008
Add support for using [& rest] to match the remaining values
in an array or tuple when destructuring.
the rest pattern is implemented by pushing remaining values in the
rhs to the stack once & is found on the lhs.
Then tuple is called and the result is assigned
to the next symbol on the lhs.
This commit DOES NOT implement handling for malformed patterns.
handles returned by CreateFileA and FILE_FLAG_OVERLAPPED
support reading from arbitrary offsets.
The offset is passed to ReadFile in through the OVERLAPPED structure.
Since state->overlapped is zeroed ev_machine_read
ReadFile would always read from the start of the file and never finish
This commit changes ev_machine_read to update the offset to
the number of bytes read before calling ReadFile.
