expression.operators.UnionFunction.kt Maven / Gradle / Ivy

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Treepat is a language to recognise patterns in trees in a similar way as regular expressions recognize patterns in strings. Treepat includes analogous operators to regex union, concatenation, and closure, which are extended to the notion of trees.

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package expression.operators

fun unionFunction(expressions: List): VisitorFunction = { targetTreeNode ->
    val answers = expressions.map { it.invoke(targetTreeNode) }.filter { it.hasMatch }
    if (answers.isNotEmpty()) {
        VisitorFunctionResponse(answers.flatMap { it.responses }, true)
    } else {
        VisitorFunctionResponseFactory.createResponseWithZeroMatches(targetTreeNode)
    }
}