mirror of https://github.com/DanilaFe/abacus
Move Abacus core into Kotlin.
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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.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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import org.nwapw.abacus.parsing.ShuntingYardParser;
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import org.nwapw.abacus.parsing.TreeBuilder;
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import org.nwapw.abacus.plugin.NumberImplementation;
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import org.nwapw.abacus.plugin.PluginManager;
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import org.nwapw.abacus.plugin.StandardPlugin;
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import org.nwapw.abacus.tree.NumberReducer;
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import org.nwapw.abacus.tree.TreeNode;
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/**
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* The main calculator class. This is responsible
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* for piecing together all of the components, allowing
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* their interaction with each other.
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*/
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public class Abacus {
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/**
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* The default number implementation to be used if no other one is available / selected.
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*/
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public static final NumberImplementation DEFAULT_IMPLEMENTATION = StandardPlugin.IMPLEMENTATION_NAIVE;
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/**
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* The plugin manager responsible for
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* loading and unloading plugins,
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* and getting functions from them.
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*/
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private PluginManager pluginManager;
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/**
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* The reducer used to evaluate the tree.
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*/
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private NumberReducer numberReducer;
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/**
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* The configuration loaded from a file.
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*/
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private Configuration configuration;
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/**
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* The tree builder used to construct a tree
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* from a string.
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*/
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private TreeBuilder treeBuilder;
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/**
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* Promotion manager responsible for the promotion system.
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*/
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private PromotionManager promotionManager;
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/**
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* Creates a new instance of the Abacus calculator.
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*
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* @param configuration the configuration object for this Abacus instance.
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*/
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public Abacus(Configuration configuration) {
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pluginManager = new PluginManager(this);
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numberReducer = new NumberReducer(this);
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this.configuration = new Configuration(configuration);
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LexerTokenizer lexerTokenizer = new LexerTokenizer();
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ShuntingYardParser shuntingYardParser = new ShuntingYardParser();
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treeBuilder = new TreeBuilder<>(lexerTokenizer, shuntingYardParser);
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promotionManager = new PromotionManager(this);
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pluginManager.addListener(shuntingYardParser);
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pluginManager.addListener(lexerTokenizer);
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pluginManager.addListener(promotionManager);
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}
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/**
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* Gets the promotion manager.
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*
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* @return the promotion manager.
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*/
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public PromotionManager getPromotionManager() {
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return promotionManager;
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}
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/**
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* Gets the current tree builder.
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*
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* @return the main tree builder in this abacus instance.
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*/
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public TreeBuilder getTreeBuilder() {
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return treeBuilder;
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}
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/**
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* Gets the current plugin manager,
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*
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* @return the plugin manager in this abacus instance.
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*/
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public PluginManager getPluginManager() {
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return pluginManager;
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}
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/**
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* Get the reducer that is responsible for transforming
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* an expression into a number.
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*
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* @return the number reducer in this abacus instance.
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*/
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public NumberReducer getNumberReducer() {
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return numberReducer;
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}
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/**
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* Gets the configuration object associated with this instance.
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*
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* @return the configuration object.
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*/
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public Configuration getConfiguration() {
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return configuration;
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}
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/**
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* Parses a string into a tree structure using the main
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* tree builder.
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*
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* @param input the input string to parse
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* @return the resulting tree, null if the tree builder or the produced tree are null.
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*/
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public TreeNode parseString(String input) {
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return treeBuilder.fromString(input);
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}
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/**
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* Evaluates the given tree using the main
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* number reducer.
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*
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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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public NumberInterface evaluateTree(TreeNode tree) {
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return tree.reduce(numberReducer);
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}
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/**
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* Gets the number implementation.
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*
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* @return the number implementation to use for creating numbers.
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*/
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public NumberImplementation getNumberImplementation() {
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NumberImplementation selectedImplementation =
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pluginManager.numberImplementationFor(configuration.getNumberImplementation());
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if (selectedImplementation != null) return selectedImplementation;
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return DEFAULT_IMPLEMENTATION;
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}
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}
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@ -0,0 +1,85 @@
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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.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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import org.nwapw.abacus.parsing.ShuntingYardParser
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import org.nwapw.abacus.parsing.TreeBuilder
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import org.nwapw.abacus.plugin.NumberImplementation
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import org.nwapw.abacus.plugin.PluginManager
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import org.nwapw.abacus.plugin.StandardPlugin
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import org.nwapw.abacus.tree.NumberReducer
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import org.nwapw.abacus.tree.TreeNode
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import org.nwapw.abacus.variables.VariableDatabase
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/**
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* Core class to handle all mathematics.
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*
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* The main calculator class. This is responsible
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* for piecing together all of the components, allowing
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* their interaction with each other.
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*
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* @property configuration the configuration to use.
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*/
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class Abacus(val configuration: Configuration) {
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/**
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* The tokenizer used to convert strings into tokens.
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*/
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private val tokenizer = LexerTokenizer()
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/**
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* Parser the parser used to convert tokens into trees.
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*/
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private val parser = ShuntingYardParser()
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/**
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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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val treeBuilder = TreeBuilder(tokenizer, parser)
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/**
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* The promotion manager used to convert between number implementations.
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*/
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val promotionManager = PromotionManager(this)
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/**
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* The number implementation used by default.
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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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init {
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pluginManager.addListener(tokenizer)
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pluginManager.addListener(parser)
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pluginManager.addListener(promotionManager)
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}
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/**
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* Parses a string into a tree structure using the main
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* tree builder.
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*
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* @param input the input string to parse
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* @return the resulting tree, null if the tree builder or the produced tree are null.
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*/
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fun parseString(input: String): TreeNode? = treeBuilder.fromString(input)
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/**
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* Evaluates the given tree using the main
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* number reducer.
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*
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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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}
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