mirror of https://github.com/DanilaFe/abacus
90 lines
3.0 KiB
Kotlin
90 lines
3.0 KiB
Kotlin
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 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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*/
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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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pluginManager.addListener(variableDatabase)
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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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} |