[Feature request] loop block: continue, break

[Asd-g]

It will be very good if there are c/cpp like continue and break in loop blocks.

[pinterf]

(Just acknowledging your request) I hope it won't be difficult. Just for the note, Avisynth loops are basically unrolled ones.

[pinterf]

gee, I found in the source that break is already implemented

[pinterf]

After a quick 'continue' implementation, it turned out that - at present implementation - breakis ignoring the preceeding commands in loop. So the following example won't display "First statement in loop 4", neither "We'll break at 4". This must be healed as well. Until I commit the continue addition, simply comment those lines out to see what I mentioned.

ColorBars()
for (i=1, 6) {
  SubTitle(Format("First statement in loop {i}"), x=0, y=i*20)
  if(i == 4) { 
    SubTitle(Format("We'll break at {i}"), x=200, y=i*20)
    break
  }
  if(i == 2) { 
    SubTitle(Format("continue at {i}"), x=200, y=i*20)
    continue
  }
  SubTitle(Format("Final statement in loop {i}"), x=300, y=i*20)
}

[pinterf]

Actual test script

ColorBars()
for (i=1, 6) {
  SubTitle(Format("statement_1 i={i}"), x=0, y=i*20)
  SubTitle(Format("statement_2 i={i}"), x=140, y=i*20)
  if(i == 4) { 
    SubTitle(Format("Break at i={i}"), x=280, y=i*20)
    break
  }
  SubTitle(Format("statement_3 i={i}"), x=280, y=i*20)
  if(i == 2) { 
    SubTitle(Format("Continue at i={i}"), x=420, y=i*20)
    continue
  }
  SubTitle(Format("Final statement in i={i}"), x=420, y=i*20)
}
SubTitle(Format("Outside"), x=0, y=7*20)

And the expected output:

statement_1 i=1    statement_2 i=1    statment_3 i=1   Final statement in i=1
statement_1 i=2    statement_2 i=2    statment_3 i=2   continue at i=2
statement_1 i=3    statement_2 i=3    statment_3 i=3   Final statement in i=3
statement_1 i=4    statement_2 i=4    Break at i=4

Outside

[pinterf]

See also commit 4014f8f7ca85d8b0c45485611eb2d4f7b52e95f1 for fixing the above mentioned break behavior.

[pinterf]

Documentation will be updated after it's considered to be working. @Asd-g: should I make a build for you to test (I guess, not :) )

[Asd-g]

Thanks for the quick implementation.

It works without issues.

[pinterf]

Your welcome. Document updates are available online: https://avisynthplus.readthedocs.io/en/latest/avisynthdoc/syntax/syntax_control_structures.html#using-break-and-continue-in-loops