Upgrade JavaParser to 3.23.0

DB/src/main/java/com/github/javaparser/ExpressionParser.java

@@ -0,0 +1,38 @@
+package com.github.javaparser;
+
+import com.github.javaparser.ast.expr.Expression;
+
+import java.io.IOException;
+import java.io.StringReader;
+
+/**
+ * Helpful class which parses expressions
+ * and performs extra "this is exactly one expression" validation
+ */
+public class ExpressionParser {
+    public static Expression parseExpression(String expression) throws ParseException, IOException {
+        // nothing static here, so no synchronization needed (javaparser used to create a static-only parser instance)
+        StringReader sr = new StringReader(expression);
+        ParseResult<Expression> result = new JavaParser().parse(ParseStart.EXPRESSION, Providers.provider(sr));
+        if (!result.isSuccessful()) {
+            throw new IllegalArgumentException("Invalid expression " + expression + ": " + result.getProblems().toString());
+        }
+        // a successful parse does not always mean there is a result.
+        Expression expr = null;
+        if (result.getResult().isPresent()) {
+            expr = result.getResult().get();
+        }
+
+        // unlikely for there to be tokens left w/out parser.token.next already being non-null (we would already have thrown...)
+        int test;
+        try {
+            while ((test = sr.read()) != -1) {
+                if (!Character.isWhitespace(test)) {
+                    throw new IllegalArgumentException("Invalid expression " + expression + " was already terminated after " + expr);
+                }
+            }
+            sr.close();
+        } catch (IOException ignored){}
+        return expr;
+    }
+}