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package org.hashtree.stringmetric.cli.similarity
import org.hashtree.stringmetric.cli._
import org.hashtree.stringmetric.similarity.WeightedLevenshteinMetric
import scala.math.BigDecimal
/**
* The weightedLevenshteinMetric [[org.hashtree.stringmetric.cli.Command]]. Compares the number of characters that two
* strings are different from one another via insertion, deletion, and substitution. Allows the invoker to indicate
* the weight each operation takes.
*/
object weightedLevenshteinMetric 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('deleteWeight) && (options('deleteWeight): OptionMapDouble).isDefined
&& options.contains('insertWeight) && (options('insertWeight): OptionMapDouble).isDefined
&& options.contains('substituteWeight) && (options('substituteWeight): OptionMapDouble).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 number of characters that two strings are different from one another via insertion, deletion, " +
"and substitution. Allows the invoker to indicate the weight each operation takes." + ls + ls +
"Syntax:" + ls +
tab + "weightedLevenshteinMetric [Options] --deleteWeight=[double] --insertWeight=[double] --substituteWeight=[double] string1 string2..." + ls + ls +
"Options:" + ls +
tab + "--deleteWeight" + ls +
tab + tab + "The weight given to delete operations." +
tab + "-h, --help" + ls +
tab + tab + "Outputs description, syntax, and options." +
tab + "--insertWeight" + ls +
tab + tab + "The weight given to insert operations." +
tab + "--substituteWeight" + ls +
tab + tab + "The weight given to substitute operations."
)
}
override def execute(options: OptionMap): Unit = {
val strings: OptionMapArray = options('dashless)
val weights = Tuple3[BigDecimal, BigDecimal, BigDecimal](
(options('deleteWeight): OptionMapBigDecimal),
(options('insertWeight): OptionMapBigDecimal),
(options('substituteWeight): OptionMapBigDecimal)
)
println(
WeightedLevenshteinMetric.compare(
strings(0),
strings(1)
)(weights).getOrElse("not comparable")
)
}
}
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