No support for combining characters. Graphemes are currently just utf-8
encodings of a single Unicode code-point. No support for code-points that
require more than 32 bits in utf-8.
1000+ LoC spent; just 300+ excluding tests.
Still one known gap; we don't check the entirety of an array's element
type if it's a compound. So far we just check if say both sides start with
'addr'. Obviously that's not good enough.
There's a question of how we should match array types with a capacity on
ones without. For now we're going to do the simplest possible thing and
just make type-match? more robust. It'll always return false if the types
don't match exactly. For ignoring capacity we'll rely on the checks of
the `address` operation (which don't exist yet). This means we should do
this to pass an address to an array to a function f with signature `f (addr
array int)`:
var a: (array int 3)
var b/eax: (addr array int) <- address a
f b
rather than this:
var a: (array int 3)
var b/eax: (addr array int 3) <- address a
f b
Similar reasoning applies to stream types. Arrays and streams are currently
the only types that can have an optional capacity.
For example:
fn main -> r/ebx: int {
var x/eax: grapheme <- copy 0x9286e2 # code point 0x2192 in utf-8
print-grapheme-to-real-screen x
print-string-to-real-screen "\n"
}
Graphemes must fit in 4 bytes (21 bits for code points). Unclear what we
should do for longer clusters since graphemes are a fixed-size type at
the moment.
Both have the same size: 4 bytes.
So far I've just renamed print-byte to print-grapheme, but it still behaves
the same.
I'm going to support printing code-points next, but grapheme 'clusters'
spanning multiple code-points won't be supported for some time.
One thing I hadn't realized in all my hacking on the mu1 prototype: clear-screen
doesn't modify active attributes. It's equivalent to printing spaces all
over the screen with the current attributes.
We now have all existing apps and prototypes going through the dependency-injected
wrapper, even though it doesn't actually implement the fake screen yet.
Kartik Agaram