feat: normalised backtick quotes

Signed-off-by: Andreas Reichel <[email protected]>

Author: manticore-projects

src/main/java/net/sf/jsqlparser/schema/MultiPartName.java

@@ -9,10 +9,12 @@
  */
 package net.sf.jsqlparser.schema;
 
+import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 public interface MultiPartName {
     Pattern LEADING_TRAILING_QUOTES_PATTERN = Pattern.compile("^[\"\\[`]+|[\"\\]`]+$");
+    Pattern BACKTICK_PATTERN = Pattern.compile("`([^`]*)`");
 
     /**
      * Removes leading and trailing quotes from a SQL quoted identifier
@@ -33,4 +35,23 @@ static boolean isQuoted(String identifier) {
     String getFullyQualifiedName();
 
     String getUnquotedName();
+
+    static String replaceBackticksWithDoubleQuotes(String input) {
+        if (input == null || input.isEmpty()) {
+            return input;
+        }
+
+        Matcher matcher = BACKTICK_PATTERN.matcher(input);
+        StringBuilder sb = new StringBuilder();
+
+        while (matcher.find()) {
+            // Replace each backtick-quoted part with double-quoted equivalent
+            String content = matcher.group(1);
+            matcher.appendReplacement(sb, "\"" + Matcher.quoteReplacement(content) + "\"");
+        }
+        matcher.appendTail(sb);
+
+        return sb.toString();
+    }
+
 }

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -15,6 +15,7 @@ options {
     DEBUG_LOOKAHEAD = false;
     DEBUG_TOKEN_MANAGER = false;
     CACHE_TOKENS = false;
+    SINGLE_TREE_FILE = false;
 //  FORCE_LA_CHECK = true;
     UNICODE_INPUT = true;
     JAVA_TEMPLATE_TYPE = "modern";