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Code Issues Releases Wiki Activity

Support removing expressions.

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This commit is contained in:
Danila Fedorin 2017-07-27 10:54:11 -07:00
parent ee1de6dc17
commit 07dd9d0a1a
1 changed files with 34 additions and 6 deletions
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40
src/org/nwapw/abacus/lexing/Lexer.java
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@ -5,10 +5,7 @@ import org.nwapw.abacus.lexing.pattern.Match;
import org.nwapw.abacus.lexing.pattern.Pattern;
import org.nwapw.abacus.lexing.pattern.PatternNode;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.*;
/**
* A lexer that can generate tokens of a given type given a list of regular expressions
@ -17,10 +14,32 @@ import java.util.HashSet;
*/
public class Lexer<T> {
private static class PatternEntry<T>{
public String name;
public T id;
public PatternEntry(String name, T id){
this.name = name;
this.id = id;
}
@Override
public int hashCode() {
return Objects.hash(name, id);
}
@Override
public boolean equals(Object obj) {
return obj instanceof PatternEntry &&
((PatternEntry) obj).name.equals(name) &&
((PatternEntry) obj).id.equals(id);
}
}
/**
* The registered patterns.
*/
private HashMap<String, Pattern<T>> patterns;
private HashMap<PatternEntry<T>, Pattern<T>> patterns;
/**
* Creates a new lexer with no registered patterns.
@ -36,7 +55,16 @@ public class Lexer<T> {
*/
public void register(String pattern, T id){
Pattern<T> compiledPattern = new Pattern<>(pattern, id);
if(compiledPattern.getHead() != null) patterns.put(pattern, compiledPattern);
if(compiledPattern.getHead() != null) patterns.put(new PatternEntry<>(pattern, id), compiledPattern);
}
/**
* Unregisters a pattern.
* @param pattern the pattern to unregister
* @param id the ID by which to identify the pattern.
*/
public void unregister(String pattern, T id){
patterns.remove(new PatternEntry<>(pattern, id));
}
/**