commonMain.org.antlr.v4.kotlinruntime.tree.ParseTreeProperty.kt Maven / Gradle / Ivy
/*
* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
* Use of this file is governed by the BSD 3-clause license that
* can be found in the LICENSE.txt file in the project root.
*/
package org.antlr.v4.kotlinruntime.tree
import com.strumenta.kotlinmultiplatform.IdentityHashMap
/**
* Associate a property with a parse tree node. Useful with parse tree listeners
* that need to associate values with particular tree nodes, kind of like
* specifying a return value for the listener event method that visited a
* particular node. Example:
*
*
* ParseTreeProperty<Integer> values = new ParseTreeProperty<Integer>();
* values.put(tree, 36);
* int x = values.get(tree);
* values.removeFrom(tree);
*
*
* You would make one decl (values here) in the listener and use lots of times
* in your event methods.
*/
class ParseTreeProperty {
protected var annotations: MutableMap = IdentityHashMap()
operator fun get(node: ParseTree): V {
return annotations[node]!!
}
fun put(node: ParseTree, value: V) {
annotations.put(node, value)
}
fun removeFrom(node: ParseTree): V {
return annotations.remove(node)!!
}
}