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package org.hashtree.stringmetric.cli.similarity
import org.hashtree.stringmetric.cli._
import org.hashtree.stringmetric.similarity.NGramMetric
/**
* The nGramMetric [[org.hashtree.stringmetric.cli.Command]]. Compares the similarity of two strings using an N-Gram
* similarity index.
*/
object nGramMetric extends Command {
override def main(args: Array[String]): Unit = {
val options = OptionMap(args)
try {
// Help.
if (options.contains('h) || options.contains('help)) {
help()
exit(options)
// Execute.
} else if (options.contains('dashless) && (options('dashless): OptionMapArray).length == 2
&& options.contains('n) && (options('n): OptionMapInt).isDefined
) {
execute(options)
exit(options)
// Invalid syntax.
} else throw new IllegalArgumentException("Expected valid syntax. See --help.")
} catch {
case e => error(e, options)
}
}
override def help(): Unit = {
val ls = sys.props("line.separator")
val tab = " "
println(
"Compares the similarity of two strings using an N-Gram similarity index." + ls + ls +
"Syntax:" + ls +
tab + "nGramMetric [Options] string1 string2..." + ls + ls +
"Options:" + ls +
tab + "-h, --help" + ls +
tab + tab + "Outputs description, syntax, and options." +
tab + "--n" + ls +
tab + tab + "The n."
)
}
override def execute(options: OptionMap): Unit = {
val strings: OptionMapArray = options('dashless)
val n: OptionMapInt = options('n)
println(
NGramMetric.compare(
strings(0),
strings(1)
)(n).getOrElse("not comparable")
)
}
}
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