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https://github.com/DanilaFe/abacus
synced 2024-12-22 23:40:08 -08:00
Support removing expressions.
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663562bab1
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@ -5,10 +5,7 @@ import org.nwapw.abacus.lexing.pattern.Match;
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import org.nwapw.abacus.lexing.pattern.Pattern;
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import org.nwapw.abacus.lexing.pattern.PatternNode;
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import java.util.ArrayList;
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import java.util.Comparator;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.*;
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/**
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* A lexer that can generate tokens of a given type given a list of regular expressions
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@ -17,10 +14,32 @@ import java.util.HashSet;
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*/
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public class Lexer<T> {
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private static class PatternEntry<T>{
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public String name;
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public T id;
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public PatternEntry(String name, T id){
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this.name = name;
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this.id = id;
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}
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@Override
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public int hashCode() {
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return Objects.hash(name, id);
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}
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@Override
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public boolean equals(Object obj) {
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return obj instanceof PatternEntry &&
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((PatternEntry) obj).name.equals(name) &&
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((PatternEntry) obj).id.equals(id);
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}
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}
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/**
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* The registered patterns.
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*/
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private HashMap<String, Pattern<T>> patterns;
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private HashMap<PatternEntry<T>, Pattern<T>> patterns;
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/**
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* Creates a new lexer with no registered patterns.
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@ -36,7 +55,16 @@ public class Lexer<T> {
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*/
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public void register(String pattern, T id){
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Pattern<T> compiledPattern = new Pattern<>(pattern, id);
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if(compiledPattern.getHead() != null) patterns.put(pattern, compiledPattern);
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if(compiledPattern.getHead() != null) patterns.put(new PatternEntry<>(pattern, id), compiledPattern);
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}
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/**
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* Unregisters a pattern.
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* @param pattern the pattern to unregister
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* @param id the ID by which to identify the pattern.
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*/
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public void unregister(String pattern, T id){
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patterns.remove(new PatternEntry<>(pattern, id));
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}
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/**
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