recognise variables

src/main/java/org/nwapw/abacus/fx/AbacusController.java

@@ -13,10 +13,7 @@ import org.nwapw.abacus.Abacus;
 import org.nwapw.abacus.config.Configuration;
 import org.nwapw.abacus.number.ComputationInterruptedException;
 import org.nwapw.abacus.number.NumberInterface;
-import org.nwapw.abacus.plugin.ClassFinder;
+import org.nwapw.abacus.plugin.*;
-import org.nwapw.abacus.plugin.PluginListener;
-import org.nwapw.abacus.plugin.PluginManager;
-import org.nwapw.abacus.plugin.StandardPlugin;
 import org.nwapw.abacus.tree.TreeNode;
 
 import java.io.File;
@@ -217,6 +214,7 @@ public class AbacusController implements PluginListener {
         PluginManager abacusPluginManager = abacus.getPluginManager();
         abacusPluginManager.addListener(this);
         abacusPluginManager.addInstantiated(new StandardPlugin(abacus.getPluginManager()));
+        abacusPluginManager.addInstantiated(new VariablePlugin(abacus.getPluginManager()));
         try {
             ClassFinder.loadJars("plugins").forEach(abacusPluginManager::addClass);
         } catch (IOException | ClassNotFoundException e) {

src/main/java/org/nwapw/abacus/lexing/Lexer.java

@@ -57,6 +57,7 @@ public class Lexer<T> {
      * @return the best match.
      */
     public Match<T> lexOne(String from, int startAt, Comparator<T> compare) {
+        //boolean variable = true;
         ArrayList<Match<T>> matches = new ArrayList<>();
         HashSet<PatternNode<T>> currentSet = new HashSet<>();
         HashSet<PatternNode<T>> futureSet = new HashSet<>();
@@ -70,6 +71,7 @@ public class Lexer<T> {
                     node.addOutputsInto(futureSet);
                 } else if (node instanceof EndNode) {
                     matches.add(new Match<>(from.substring(startAt, index), ((EndNode<T>) node).getPatternId()));
+                    //variable = false;
                 }
             }
 
@@ -84,6 +86,9 @@ public class Lexer<T> {
         if (compare != null) {
             matches.sort(Comparator.comparingInt(a -> a.getContent().length()));
         }
+        //if(variable&&) {
+        //    matches.add(new Match<>(from.substring(startAt, index), ((EndNode<T>) node).getPatternId()));
+        //}
         return matches.isEmpty() ? null : matches.get(matches.size() - 1);
     }
 

src/main/java/org/nwapw/abacus/lexing/pattern/Match.java

@@ -1,5 +1,7 @@
 package org.nwapw.abacus.lexing.pattern;
 
+import org.nwapw.abacus.tree.TokenType;
+
 /**
  * A match that has been generated by the lexer.
  *

src/main/java/org/nwapw/abacus/parsing/LexerTokenizer.java

@@ -36,6 +36,7 @@ public class LexerTokenizer implements Tokenizer<Match<TokenType>>, PluginListen
             register("[0-9]*(\\.[0-9]+)?", TokenType.NUM);
             register("\\(", TokenType.OPEN_PARENTH);
             register("\\)", TokenType.CLOSE_PARENTH);
+            register("[a-zA-Z]+",TokenType.VARIABLE);
         }};
     }
 

src/main/java/org/nwapw/abacus/parsing/ShuntingYardParser.java

@@ -63,7 +63,9 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
             matchType = match.getType();
             if (matchType == TokenType.NUM) {
                 output.add(match);
-            } else if (matchType == TokenType.FUNCTION) {
+            }else if(matchType == TokenType.VARIABLE) {
+                output.add(match);
+            }else if (matchType == TokenType.FUNCTION) {
                 output.add(new Match<>("", TokenType.INTERNAL_FUNCTION_END));
                 tokenStack.push(match);
             } else if (matchType == TokenType.OP) {
@@ -144,6 +146,8 @@ public class ShuntingYardParser implements Parser<Match<TokenType>>, PluginListe
             }
         } else if (matchType == TokenType.NUM) {
             return new NumberNode(abacus.numberFromString(match.getContent()));
+        } else if (matchType == TokenType.VARIABLE){
+            return new VariableNode(match.getContent());
         } else if (matchType == TokenType.FUNCTION) {
             String functionName = match.getContent();
             FunctionNode node = new FunctionNode(functionName);

src/main/java/org/nwapw/abacus/tree/TokenType.java

@@ -7,7 +7,7 @@ package org.nwapw.abacus.tree;
 public enum TokenType {
 
     INTERNAL_FUNCTION_END(-1),
-    ANY(0), WHITESPACE(1), COMMA(2), OP(3), NUM(4), FUNCTION(5), OPEN_PARENTH(6), CLOSE_PARENTH(7);
+    ANY(0), WHITESPACE(1), COMMA(2), OP(3), NUM(4), VARIABLE(5), FUNCTION(6), OPEN_PARENTH(7), CLOSE_PARENTH(8);
 
     /**
      * The priority by which this token gets sorted.