Groovy script for finding empty catch blocks

import java.io.*

import java.util.*



class Block {

 catchType

 lineNumber

 lines = new ArrayList()

 Block(catchType, lineNumber) {

   this.catchType = catchType

   this.lineNumber = lineNumber

 }

 add(line) {

   if (line.trim().length() == 0) { return }

   lines.add(line)

 }

 isEmpty() {

   lines.empty

 }

}



completedBlocks = []

lineNumber = 0

blocks = [new Block(false, 0)]

catchType = false

new File(args[0]).eachLine() { line |

 lineNumber++

 tokenizer = new StringTokenizer(line, "{}", true)

 while (tokenizer.hasMoreTokens()) {

   token = tokenizer.nextToken().trim()

   if (token == "{") {

     blocks.add(new Block(catchType, lineNumber))

     catchType = false

   }

   else if (token == "}") {

     completedBlocks.add(blocks.pop())

   }

   else {

     if (token =~ "\\s*//.*") { return }

     if (token =~ ".*catch\\s*\\(.*") { catchType = true }

     blocks[-1].add(token)

   }

 }

}

lineNumbers = []

completedBlocks.each { block |

 if (block.catchType && block.isEmpty()) { lineNumbers.add(block.lineNumber) }

}

if (lineNumbers.size() > 0) {

 print args[0] + " " + lineNumbers + "\n"

}