Multiline if statements?

[kkirby]

Is it possible to have multiline if statements?

if thisreallylongexpression
    and thisOtherReallyLongExpression

Thanks

[McSaks]

macro \\
 syntax b as Body
  ASTE $b

if thisreallylongexpression and \\
   thisOtherReallyLongExpression
     Do something

works for this simple two-line expression. Not an elegant solution, though. For multiline one it becomes

if one and \\
 two and    \\
  three and  \\
   four       \\
     Do something

with successive indentings.

I’m not a pro in writing macros and processing AST nodes; it may be better solution.

[kkirby]

Ha, that's pretty brilliant. Thanks!

[McSaks]

A bit better:

macro multiline!
 syntax op as Logic, b as Body
  let mutable vals = null
  if b.func.inspect() == 'Symbol.block'
    vals := b.args[0].args[0]
    for line, ind in b.args
      if ind
        vals := @call op, vals, line.args[0]
  else
    vals := b.args[0]
  vals

if multiline! (and)
    _ thisreallylongexpression
    _ thisOtherReallyLongExpression
    _ that.Other + Really (complex Expression or not very) and multiline! (or)
      // An ignored underscore may be replaced by any identifier
      // but not a macro, hence ‘OR’, not ‘or’:
      OR true
      OR false
  Do something

It’s somewhat tricky but seems to work.

It can be used not only with logical expressions:

let sum = multiline! (+)
  _ first.summand
  _ second summand
  _ this.is the-third

I had to use function-call syntax with ignored callee (‘_ something’ is syntactically nothing more than function call) due to GorillaScript’s annihilation of evidently-non-side-effect expressions. So,

bad-multiline! (and)
  one two
  three.four
  five()

would immediately reduce to

bad-multiline! (and)
  one two
  five()

[kkirby]

Coming back to this after awhile, but @McSaks you can also do:

if (and)(
    a == b,
    c == d
)
    console.log true

[McSaks]

@kkirby, Well, it was facepalmly obvious… in retrospective. Heh, Haven’t heard of gorilla for years, nearly forgot. It didn’t run now without a patch.

[kkirby]

@McSaks Yeah, check out my fork at https://github.com/kkirby/gorillascript it has a few patches keeping GorillaScript working with the newer javascript engines.

[vendethiel]

The only issue with that (and)(...) style is that is breaks shortcircuiting :/.