Currently SUBLIST just causes an error if it's found at the start of the line.
I was wondering if there's a way we could USE that construct, instead of
error-ing out.
So... what do you think about extending SUBLIST, so that if it starts a line
(after indent), it wraps the right-hand-block with a list? E.G., EMPTY $ RHS
maps to ( RHS )?
This might be especially useful for Scheme's "do"; it'd also be handy for let
when there's only one variable. For example, here's part of our "basic"
example with do (I've "!" indented for HTML readers):
do (i(0 {i + 1}))
! \\
! ! {i = nr1} r
! do ((j 0 {j + 1}))
! ! \\
! ! ! {j = nc2}
! ! do
! ! ! \\
! ! ! ! k 0 {k + 1}
! ! ! ! a 0 {a + {matrix-ref(m1 i k) * matrix-ref(m2 k j)}}
! ! ! \\
! ! ! ! {k = nr2}
! ! ! ! matrix-set!(r i j a)
do
! $ i 0 {i + 1}
! $ {i = nr1} r
! do
! ! $ j 0 {j + 1}
! ! $ {j = nc2}
! ! do
! ! ! \\
! ! ! ! k 0 {k + 1}
! ! ! ! a 0 {a + {matrix-ref(m1 i k) * matrix-ref(m2 k j)}}
! ! ! \\
! ! ! ! {k = nr2}
! ! ! ! matrix-set!(r i j a)
And for single-variable let:
let
! $ var1 value1
! body
--- David A. Wheeler
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