target_tree.default_tree.DefaultTargetTree.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 target_tree.default_tree

import grammars.antlr.tree_format.TreeFormatVisitorImplementation
import java.nio.file.Path
import org.antlr.v4.runtime.CharStreams
import org.antlr.v4.runtime.CommonTokenStream
import org.antlr.v4.runtime.tree.ParseTree
import target_tree.TargetTree
import target_tree.TargetTreeNode
import tree_format.TreeFormatLexer
import tree_format.TreeFormatParser

class DefaultTargetTree(override var root: T? = null) :
    TargetTree {

    /**
     * Read tree from grammar.antlr.
     */
    constructor(tree_file: Path) : this() {
        val lexer = TreeFormatLexer(CharStreams.fromPath(tree_file))
        val tokenStream = CommonTokenStream(lexer)
        val fileParser = TreeFormatParser(tokenStream)
        val tree: ParseTree = fileParser.subtree()
        val treeVisitor = TreeFormatVisitorImplementation()
        @Suppress("UNCHECKED_CAST")
        root = treeVisitor.visit(tree) as? T
    }
}