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https://github.com/DanilaFe/abacus
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Rewrite number reducer in Kotlin.
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@ -1,93 +0,0 @@
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package org.nwapw.abacus.tree;
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import org.nwapw.abacus.Abacus;
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import org.nwapw.abacus.function.NumberFunction;
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import org.nwapw.abacus.function.NumberOperator;
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import org.nwapw.abacus.function.TreeValueFunction;
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import org.nwapw.abacus.function.TreeValueOperator;
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import org.nwapw.abacus.number.NumberInterface;
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import org.nwapw.abacus.number.PromotionManager;
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import org.nwapw.abacus.number.PromotionResult;
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import org.nwapw.abacus.variables.VariableDatabase;
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/**
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* A reducer implementation that turns a tree into a single number.
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* This is not always guaranteed to work.
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*/
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public class NumberReducer implements Reducer<NumberInterface> {
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/**
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* The plugin manager from which to draw the functions.
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*/
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private Abacus abacus;
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/**
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* Creates a new number reducer.
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*
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* @param abacus the calculator instance.
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*/
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public NumberReducer(Abacus abacus) {
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this.abacus = abacus;
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}
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@Override
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public NumberInterface reduceNode(TreeNode node, Object... children) {
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PromotionManager manager = abacus.getPromotionManager();
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if (node instanceof NumberNode) {
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return abacus.getNumberImplementation().instanceForString(((NumberNode) node).getNumber());
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} else if (node instanceof VariableNode) {
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VariableDatabase database = abacus.getVariableDatabase();
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String name = ((VariableNode) node).getVariable();
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NumberInterface variable = database.getVariables().get(name);
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if(variable != null) return variable;
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TreeNode definition = database.getDefinitions().get(name);
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if(definition != null) return definition.reduce(this);
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return abacus.getNumberImplementation().instanceForString("0");
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} else if (node instanceof NumberBinaryNode) {
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NumberInterface left = (NumberInterface) children[0];
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NumberInterface right = (NumberInterface) children[1];
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NumberOperator operator = abacus.getPluginManager().operatorFor(((BinaryNode) node).getOperation());
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PromotionResult result = manager.promote(left, right);
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if (result == null) return null;
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return operator.apply(result.getPromotedTo(), result.getItems());
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} else if (node instanceof NumberUnaryNode) {
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NumberInterface child = (NumberInterface) children[0];
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NumberOperator operator = abacus.getPluginManager().operatorFor(((UnaryNode) node).getOperation());
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return operator.apply(abacus.getPluginManager().interfaceImplementationFor(child.getClass()), child);
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} else if (node instanceof FunctionNode) {
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NumberInterface[] convertedChildren = new NumberInterface[children.length];
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for (int i = 0; i < convertedChildren.length; i++) {
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convertedChildren[i] = (NumberInterface) children[i];
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}
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NumberFunction function = abacus.getPluginManager().functionFor(((FunctionNode) node).getCallTo());
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if (function == null) return null;
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PromotionResult result = manager.promote(convertedChildren);
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if (result == null) return null;
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return function.apply(result.getPromotedTo(), result.getItems());
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} else if (node instanceof TreeValueFunctionNode) {
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CallNode callNode = (CallNode) node;
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TreeNode[] realChildren = new TreeNode[callNode.getChildren().size()];
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for (int i = 0; i < realChildren.length; i++) {
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realChildren[i] = callNode.getChildren().get(i);
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}
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TreeValueFunction function =
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abacus.getPluginManager().treeValueFunctionFor(callNode.getCallTo());
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if (function == null) return null;
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return function.applyWithReducer(abacus.getNumberImplementation(), this, realChildren);
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} else if (node instanceof TreeValueBinaryNode) {
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BinaryNode binaryNode = (BinaryNode) node;
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TreeValueOperator operator = abacus.getPluginManager()
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.treeValueOperatorFor(binaryNode.getOperation());
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if (operator == null) return null;
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return operator.applyWithReducer(abacus.getNumberImplementation(), this, binaryNode.getLeft(), binaryNode.getRight());
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} else if (node instanceof TreeValueUnaryNode) {
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UnaryNode unaryNode = (UnaryNode) node;
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TreeValueOperator operator = abacus.getPluginManager()
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.treeValueOperatorFor(unaryNode.getOperation());
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if (operator == null) return null;
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return operator.applyWithReducer(abacus.getNumberImplementation(), this, unaryNode.getApplyTo());
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}
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return null;
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}
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}
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@ -1,6 +1,8 @@
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package org.nwapw.abacus
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import org.nwapw.abacus.config.Configuration
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import org.nwapw.abacus.context.MutableReductionContext
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import org.nwapw.abacus.context.ReductionContext
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import org.nwapw.abacus.number.NumberInterface
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import org.nwapw.abacus.number.PromotionManager
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import org.nwapw.abacus.parsing.LexerTokenizer
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@ -36,10 +38,6 @@ class Abacus(val configuration: Configuration) {
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* The plugin manager used to handle loading and unloading plugins.
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*/
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val pluginManager = PluginManager(this)
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/**
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* The reducer used to turn trees into a single number.
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*/
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val numberReducer = NumberReducer(this)
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/**
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* The tree builder that handles the conversion of strings into trees.
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*/
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@ -52,16 +50,16 @@ class Abacus(val configuration: Configuration) {
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* The database of variable definitions.
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*/
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val variableDatabase = VariableDatabase(this)
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/**
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* The number implementation used by default.
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* The hidden, mutable implementation of the context.
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*/
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val numberImplementation: NumberImplementation
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get() {
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val selectedImplementation =
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pluginManager.numberImplementationFor(configuration.numberImplementation)
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if (selectedImplementation != null) return selectedImplementation
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return StandardPlugin.IMPLEMENTATION_NAIVE
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}
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private val mutableContext = MutableReductionContext(numberImplementation = StandardPlugin.IMPLEMENTATION_NAIVE)
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/**
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* The base context from which calculations are started.
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*/
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val context: ReductionContext
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get() = mutableContext
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init {
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pluginManager.addListener(tokenizer)
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@ -85,6 +83,7 @@ class Abacus(val configuration: Configuration) {
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* @param tree the tree to reduce, must not be null.
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* @return the resulting number, or null of the reduction failed.
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*/
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fun evaluateTree(tree: TreeNode): NumberInterface? = tree.reduce(numberReducer)
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fun evaluateTree(tree: TreeNode): NumberInterface? =
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tree.reduce(NumberReducer(this, context.mutableSubInstance()))
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}
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57
core/src/main/kotlin/org/nwapw/abacus/tree/NumberReducer.kt
Normal file
57
core/src/main/kotlin/org/nwapw/abacus/tree/NumberReducer.kt
Normal file
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@ -0,0 +1,57 @@
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package org.nwapw.abacus.tree
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import org.nwapw.abacus.Abacus
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import org.nwapw.abacus.context.MutableReductionContext
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import org.nwapw.abacus.function.NumberFunction
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import org.nwapw.abacus.number.NumberInterface
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class NumberReducer(val abacus: Abacus, val context: MutableReductionContext) : Reducer<NumberInterface> {
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override fun reduceNode(treeNode: TreeNode, vararg children: Any): NumberInterface? {
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val promotionManager = abacus.promotionManager
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return when(treeNode){
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is NumberNode -> {
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context.inheritedNumberImplementation?.instanceForString(treeNode.number)
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}
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is VariableNode -> {
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val variable = context.getVariable(treeNode.variable)
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if(variable != null) return variable
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val definition = context.getDefinition(treeNode.variable)
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if(definition != null) return definition.reduce(this)
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null
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}
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is NumberUnaryNode -> {
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val child = children[0] as NumberInterface
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abacus.pluginManager.operatorFor(treeNode.operation)
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.apply(abacus.pluginManager.interfaceImplementationFor(child.javaClass), child)
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}
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is NumberBinaryNode -> {
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val left = children[0] as NumberInterface
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val right = children[1] as NumberInterface
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val promotionResult = promotionManager.promote(left, right) ?: return null
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abacus.pluginManager.operatorFor(treeNode.operation).apply(promotionResult.promotedTo, *promotionResult.items)
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}
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is FunctionNode -> {
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val promotionResult = promotionManager
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.promote(*children.map { it as NumberInterface }.toTypedArray()) ?: return null
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abacus.pluginManager.functionFor(treeNode.callTo).apply(promotionResult.promotedTo, *promotionResult.items)
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}
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is TreeValueUnaryNode -> {
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abacus.pluginManager.treeValueOperatorFor(treeNode.operation)
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.applyWithReducer(context.inheritedNumberImplementation!!, this, children[0] as TreeNode)
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}
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is TreeValueBinaryNode -> {
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abacus.pluginManager.treeValueOperatorFor(treeNode.operation)
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.applyWithReducer(context.inheritedNumberImplementation!!, this,
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children[0] as TreeNode, children[1] as TreeNode)
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}
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is TreeValueFunctionNode -> {
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abacus.pluginManager.treeValueFunctionFor(treeNode.callTo)
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.applyWithReducer(context.inheritedNumberImplementation!!, this,
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*children.map { it as TreeNode }.toTypedArray())
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}
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else -> null
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}
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}
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}
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