mirror of https://github.com/DanilaFe/abacus
115 lines
3.7 KiB
Kotlin
115 lines
3.7 KiB
Kotlin
package org.nwapw.abacus
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import org.nwapw.abacus.config.Configuration
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import org.nwapw.abacus.context.MutableEvaluationContext
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import org.nwapw.abacus.context.EvaluationContext
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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.PluginManager
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import org.nwapw.abacus.plugin.StandardPlugin
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import org.nwapw.abacus.tree.EvaluationResult
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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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* 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 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 hidden, mutable implementation of the context.
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*/
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private val mutableContext = MutableEvaluationContext(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: EvaluationContext
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get() = mutableContext
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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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* Reloads the Abacus core.
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*/
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fun reload(){
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pluginManager.reload()
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with(mutableContext) {
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numberImplementation = pluginManager.numberImplementationFor(configuration.numberImplementation)
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?: StandardPlugin.IMPLEMENTATION_NAIVE
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clearVariables()
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clearDefinitions()
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}
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}
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/**
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* Merges the current context with the provided one, updating
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* variables and the like.
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* @param context the context to apply.
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*/
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fun applyToContext(context: EvaluationContext){
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mutableContext.apply(context)
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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.
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*
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* @param tree the tree to reduce, must not be null.
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* @return the evaluation result.
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*/
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fun evaluateTree(tree: TreeNode): EvaluationResult {
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return evaluateTreeWithContext(tree, context.mutableSubInstance())
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}
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/**
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* Evaluates the given tree using a different context than
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* the default one.
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*
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* @param tree the tree to reduce, must not be null.
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* @param context the context to use for the evaluation.
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* @return the evaluation result.
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*/
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fun evaluateTreeWithContext(tree: TreeNode, context: MutableEvaluationContext): EvaluationResult {
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val newReducer = NumberReducer(this, context)
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val evaluationValue = tree.reduce(newReducer)
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return EvaluationResult(evaluationValue, newReducer.context)
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}
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} |