Add support for AssemblyFor

[fvictorio]

Closes #91. Depends on #92.

I don't like how this is prettifying the fors, but at least now it won't fail when it finds them. This:

for { let i := 0 } lt(i, x) { i := add(i, 1) } { y := mul(2, y) }

is being printed as:

for {
  let i := 0
} lt(i, x) {
  i := add(i, 1)
} {
  y := mul(2, y)
}

I would prefer this:

for { let i := 0 } lt(i, x) { i := add(i, 1) } {
  y := mul(2, y)
}

(give or take).

The problem here is that the pre and post parts of the for are AssemblyBlocks, and in most cases it makes sense to print those with a newline after the opening brace.

[codecov]

Codecov Report

Merging #94 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #94      +/-   ##
==========================================
+ Coverage   94.44%   94.46%   +0.02%     
==========================================
  Files           5        5              
  Lines         234      235       +1     
  Branches       50       50              
==========================================
+ Hits          221      222       +1     
  Misses         13       13

Impacted Files	Coverage Δ
src/printer.js	94.32% <100%> (+0.02%)	⬆️

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[mattiaerre]

waiting for #92 to be fixed

[mattiaerre]

I do agree with you, this seems a little bit odd but that's a good starting point; I'll wait for you to address #92 and then we can merge both

[mattiaerre]

some conflicts that need to be resolved @fvictorio

[fvictorio]

@mattiaerre Done!

[mattiaerre]

👍