| Commit message (Collapse) | Author | Age | Files | Lines |
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We'll keep it around for keyboard input now, for the nice scancode
names.
Ansi escape codes from http://tldp.org/HOWTO/Bash-Prompt-HOWTO/x361.html
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Just forget about unicode for now.
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Doesn't quite work yet; I can't have spaces after labels.
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For now we want to parse two labels:
'run', identifying call stack, op and args
'mem', distinguishing reads and writes
This should give us fodder for a few weeks, to build both a folding UI
for individual statements and descending the call stack, and also a
query engine that can figure out sources and sinks in the trace graph.
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The relative global variables go into the outer lexical scope.
Sharing local variables between functions yet again proven to be a bad
idea.
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But now that we've added the keyboard parameter to process-keys,
modifying it in a recursive call also clobbers it in the caller. All
because of my weird, non-standard use of shared scope.
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Swap printing generalized objects using arc's infrastructure to be the
$-prefixed debug helper, while the erstwhile $print-key-to-host becomes
the primitive print-character to host.
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Typo in a recent test.
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process-key is extracted to work on a given character, but its helpers
for parsing strings and comments still read keys directly from keyboard.
Still, this took long enough to get working that it's worth saving.
Milestones:
a) figuring out how to debug without dumping trace crap on the screen
in cursor mode.
b) realizing you can't assign directly to result in the up case. Have
to let the recursive call do it.
c) replacing continuations in 'process-key'.
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Took me all day to realize this, that recursive calls to process-key
won't work as long as we call that next-key continuation.
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You can't just extract the array from inside a buffer. Its length isn't
right. Only reason we didn't catch this sooner is I think that arc's
simulated memory is initialized to all nils, which has some
serendipitous properties.
I should initialize memory to random values one of these days and see
what shakes out.
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's-expression' is too jargon-y.
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Only non-obvious changes here are handling the early exits.
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Jumps forward are harder than jumps back. You can't create a
continuation until you get to it. And we don't have a way to return
things from a continuation yet. That's a flaw. Maybe we need a
'reply-from' operator.
But for now, this small bit of code we can just inline and duplicate.
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Works beautifully!
This is the first step to hoisting all the code for reading a key into
its own function. In other languages extracting arbitrary code into a
function requires passing all arguments into it, which is annoying and
hard to read. In mu you can just pass your default-space to it to share
all local variables. But there's been one additional complication until
now: labels, which are namespaced by function. Now we can replace
labels with continuations and extract arbitrary code into new functions.
Might be confusing to lose a few stack frames. Might end up undoing
values of some important local. We'll see if we run into that.
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