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Execute a Markov algorithm: Difference between revisions
Added Scala
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})
end</lang>
=={{header|Scala}}==
{{works with|Scala|2.8}}
<lang scala>import scala.annotation.tailrec
import scala.io.Source
object MarkovAlgorithm {
val RulePattern = """(.*?)\s+->\s+(\.?)(.*)""".r
val CommentPattern = """#.*|\s*""".r
def rule(line: String) = line match {
case CommentPattern() => None
case RulePattern(pattern, terminal, replacement) => Some(pattern, replacement, terminal == ".")
case _ => error("Syntax error on line "+line)
}
def main(args: Array[String]) {
if (args.size != 2 ) {
println("Syntax: MarkovAlgorithm inputFile inputPattern")
exit(1)
}
val rules = (Source fromPath args(0) getLines () map rule).toList.flatten
def algorithm(input: String): String = rules find (input contains _._1) match {
case Some((pattern, replacement, true)) => input replaceFirst ("\\Q"+pattern+"\\E", replacement)
case Some((pattern, replacement, false)) => algorithm(input replaceFirst ("\\Q"+pattern+"\\E", replacement))
case None => input
}
println(args(1))
println(algorithm(args(1)))
}
}</lang>
Sample outputs:
<pre>
C:\>scala MarkovAlgorithm ruleset1.txt "I bought a B of As from T S."
I bought a B of As from T S.
I bought a bag of apples from my brother.
C:\>scala MarkovAlgorithm ruleset2.txt "I bought a B of As from T S."
I bought a B of As from T S.
I bought a bag of apples from T shop.
C:\>scala MarkovAlgorithm ruleset3.txt "I bought a B of As W my Bgage from T S."
I bought a B of As W my Bgage from T S.
I bought a bag of apples with my money from T shop.
C:\>scala MarkovAlgorithm ruleset4.txt "_1111*11111_"
_1111*11111_
11111111111111111111
</pre>
=={{header|Tcl}}==
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