feat: Quoted Identifiers can contain double-quotes (PostgreSQL)

- `SELECT "test""column""name"`
- fixes #1335

Author: manticore-projects

src/main/java/net/sf/jsqlparser/statement/Statements.java

@@ -30,6 +30,10 @@ public void accept(StatementVisitor statementVisitor) {
         statementVisitor.visit(this);
     }
 
+    public <E extends Statement> E get(Class<E> type, int index) {
+        return type.cast(get(index));
+    }
+
     @Override
     public String toString() {
         StringBuilder b = new StringBuilder();

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

@@ -554,7 +554,7 @@ TOKEN:
             input_stream.backup(image.length() - matchedToken.image.length() );
         }
     }
-| < S_QUOTED_IDENTIFIER: "\"" (~["\n","\r","\""])* "\"" | "$$" (~["$"])* "$$" | ("`" (~["\n","\r","`"])+ "`") | ( "[" (~["\n","\r","]"])* "]" ) >
+| < S_QUOTED_IDENTIFIER: "\"" ( "\"\"" | ~["\n","\r","\""])* "\"" | "$$" (~["$"])* "$$" | ("`" (~["\n","\r","`"])+ "`") | ( "[" (~["\n","\r","]"])* "]" ) >
     {
         if ( !configuration.getAsBoolean(Feature.allowSquareBracketQuotation) && matchedToken.image.charAt(0) == '[' ) {
             matchedToken.image = "[";

src/test/java/net/sf/jsqlparser/expression/JsonExpressionTest.java

@@ -10,7 +10,6 @@
 package net.sf.jsqlparser.expression;
 
 import net.sf.jsqlparser.JSQLParserException;
-import net.sf.jsqlparser.test.TestUtils;
 import org.junit.jupiter.api.Test;
 
 import static net.sf.jsqlparser.test.TestUtils.assertSqlCanBeParsedAndDeparsed;
@@ -21,19 +20,19 @@ class JsonExpressionTest {
     void testIssue1792() throws JSQLParserException, InterruptedException {
         String sqlStr =
                 "SELECT ''::JSON -> 'obj'::TEXT";
-        TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
+        assertSqlCanBeParsedAndDeparsed(sqlStr, true);
 
         sqlStr =
                 "SELECT ('{\"obj\":{\"field\": \"value\"}}'::JSON -> 'obj'::TEXT ->> 'field'::TEXT)";
-        TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
+        assertSqlCanBeParsedAndDeparsed(sqlStr, true);
 
         sqlStr =
                 "SELECT\n"
                         + " CASE\n"
                         + "    WHEN true\n"
                         + "    THEN (SELECT ((('{\"obj\":{\"field\": \"value\"}}'::JSON -> 'obj'::TEXT ->> 'field'::TEXT))))\n"
                         + " END";
-        TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
+        assertSqlCanBeParsedAndDeparsed(sqlStr, true);
     }
 
     @Test

src/test/java/net/sf/jsqlparser/statement/UnsupportedStatementTest.java

@@ -85,7 +85,7 @@ void testAlter() throws JSQLParserException {
         String sqlStr =
                 "ALTER INDEX idx_t_fa RENAME TO idx_t_fb";
         Statement statement = TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
-        Assertions.assertTrue(statement instanceof UnsupportedStatement);
+        assertTrue(statement instanceof UnsupportedStatement);
     }
 
     @Test

src/test/java/net/sf/jsqlparser/statement/select/PostgresTest.java

@@ -11,10 +11,16 @@
 
 import net.sf.jsqlparser.JSQLParserException;
 import net.sf.jsqlparser.expression.JsonExpression;
+import net.sf.jsqlparser.parser.CCJSqlParserUtil;
+import net.sf.jsqlparser.schema.Column;
+import net.sf.jsqlparser.statement.Statements;
+import net.sf.jsqlparser.statement.insert.Insert;
 import net.sf.jsqlparser.test.TestUtils;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
+import java.util.List;
+
 import static net.sf.jsqlparser.test.TestUtils.assertSqlCanBeParsedAndDeparsed;
 
 public class PostgresTest {
@@ -62,4 +68,31 @@ public void testJSonOperatorIssue1571() throws JSQLParserException {
                 "select visit_hour,json_array_elements(into_sex_json)->>'name',json_array_elements(into_sex_json)->>'value' from period_market";
         TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
     }
+
+    @Test
+    void testPostgresQuotingIssue1335() throws JSQLParserException {
+        String sqlStr =
+                "INSERT INTO \"table\"\"with\"\"quotes\" (\"column\"\"with\"\"quotes\")\n"
+                        + "VALUES ('1'), ('2'), ('3');\n"
+                        + "\n"
+                        + "UPDATE \"table\"\"with\"\"quotes\" SET \"column\"\"with\"\"quotes\" = '1.0'  \n"
+                        + "WHERE \"column\"\"with\"\"quotes\" = '1';\n"
+                        + "\n"
+                        + "SELECT \"column\"\"with\"\"quotes\" FROM  \"table\"\"with\"\"quotes\"\n"
+                        + "WHERE \"column\"\"with\"\"quotes\" IS NOT NULL;";
+
+        Statements statements = CCJSqlParserUtil.parseStatements(sqlStr);
+        Assertions.assertEquals(3, statements.size());
+
+        Insert insert = statements.get(Insert.class, 0);
+        Assertions.assertEquals(
+                "\"table\"\"with\"\"quotes\"", insert.getTable().getFullyQualifiedName());
+
+        PlainSelect select = statements.get(PlainSelect.class, 2);
+        List<SelectItem<?>> selectItems = select.getSelectItems();
+
+        Assertions.assertEquals(
+                "\"column\"\"with\"\"quotes\"",
+                selectItems.get(0).getExpression(Column.class).getColumnName());
+    }
 }