Writing this while-loop in for-loop

Question

I'm working with StanfordNLP to extract data from a parsed Tree.

I'm using Scala for coding.

val tp = TregexPattern.compile("SOME_PATTERN")
val res = tp.matcher("SOME_TREE")

to read the results of this I use

while (res.find()) {
  println(res.getMatch.getLeaves.mkString(" "))
}

I want to rewrite this while-loop in for-loop.

amrnt · Accepted Answer · 2013-01-05 14:44:46Z

1

How about this:

val tp = TregexPattern.compile("SOME_PATTERN")
val res = tp.matcher("SOME_TREE")
for(it <- Iterator.continually(res.getMatch).takeWhile(_ => res.find)) {
  println(it.getLeaves.mkString(" "))
}

edited Jan 5, 2013 at 14:44

amrnt

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answered Jan 5, 2013 at 14:15

Eastsun

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3 Comments

amrnt Over a year ago

Works well, but the first result of it returned is a null, how to handle this?

amrnt Over a year ago

something like this works tags <- Iterator.continually(res.getMatch).takeWhile(_ => res.find) if tags != null but is there a better way? or the whole code in another way?!

Tesseract Over a year ago

Put a "res.find" in front of the for loop to avoid getting null.

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