Add parseParens, use computed MAX_PRECEDENCE

Author: MarcellPerger1

src/main/java/net/marcellperger/mathexpr/SymbolInfo.java

@@ -29,6 +29,7 @@ public enum SymbolInfo {
     public static final Map<Class<? extends MathSymbol>, SymbolInfo> CLS_TO_INFO_MAP;
     public static final Map<Integer, Set<SymbolInfo>> PREC_TO_INFO_MAP;
     public static final List<Entry<Integer, Set<SymbolInfo>>> PREC_SORTED_INFO;
+    public static final int MAX_PRECEDENCE;
 
     public final int precedence;  // TODO make this Integer
     public final Class<? extends MathSymbol> cls;
@@ -103,5 +104,6 @@ public enum SymbolInfo {
         CLS_TO_INFO_MAP = Arrays.stream(values()).collect(Collectors.toUnmodifiableMap(p -> p.cls, p -> p));
         PREC_TO_INFO_MAP = Arrays.stream(values()).collect(Collectors.groupingBy(s -> s.precedence, Collectors.toUnmodifiableSet()));
         PREC_SORTED_INFO = PREC_TO_INFO_MAP.entrySet().stream().sorted(Comparator.comparingInt(Entry::getKey)).toList();
+        MAX_PRECEDENCE = PREC_SORTED_INFO.getLast().getKey();
     }
 }

src/main/java/net/marcellperger/mathexpr/parser/Parser.java

@@ -27,12 +27,16 @@ public Parser(String src_) {
     }
 
     public MathSymbol parse() throws ExprParseException {
-        MathSymbol sym = parseInfixPrecedenceLevel(3);  // TODO compute max prec level
+        MathSymbol sym = parseExpr();
         discardWhitespace();
         if(notEof()) throw new ExprParseException("Syntax error: didn't reach end of input");
         return sym;
     }
 
+    public MathSymbol parseExpr() throws ExprParseException {
+        return parseInfixPrecedenceLevel(SymbolInfo.MAX_PRECEDENCE);
+    }
+
     // https://regex101.com/r/2EogTA/1
     protected static final Pattern DOUBLE_RE = Pattern.compile("^([+-]?)(\\d*\\.\\d+|\\d+\\.?)(?:[eE]([+-]?\\d+))?");
     public @NotNull MathSymbol parseDoubleLiteral_exc() throws ExprParseException {
@@ -66,10 +70,9 @@ public MathSymbol parse() throws ExprParseException {
         return parseDoubleLiteral_null();
     }
 
-    private static final int PREC_IN_PARENS = 3;  // TODO compute max prec level
     public @Nullable MathSymbol parseParens() throws ExprParseException {
         advanceExpectNext('(');
-        MathSymbol sym = parseInfixPrecedenceLevel(PREC_IN_PARENS);  // TODO use .parse() when it is completed
+        MathSymbol sym = parseExpr();
         advanceExpectNext(')');
         return sym;
     }