feat: add a method checking balanced brackets

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

Author: manticore-projects

src/main/java/net/sf/jsqlparser/parser/CCJSqlParserUtil.java

@@ -12,6 +12,7 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.Reader;
+import java.util.Stack;
 import java.util.concurrent.Callable;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
@@ -439,4 +440,43 @@ public static int getNestingDepth(String sql) {
         }
         return maxlevel;
     }
+
+    public static int getUnbalancedPosition(String text) {
+        Stack<Character> stack = new Stack<>();
+        boolean insideQuote = false;
+
+        for (int i = 0; i < text.length(); i++) {
+            char c = text.charAt(i);
+            if (c == '"' || c == '\'') {
+                if (!insideQuote) {
+                    stack.push(c); // Add quote to stack
+                } else if (stack.peek() == c) {
+                    stack.pop(); // Matching quote found, remove from stack
+                }
+                insideQuote = !insideQuote; // Toggle insideQuote flag
+            } else if (!insideQuote && (c == '(' || c == '[' || c == '{')) {
+                stack.push(c); // Add opening bracket to stack
+            } else if (!insideQuote && (c == ')' || c == ']' || c == '}')) {
+                if (stack.isEmpty()) {
+                    return i; // Return position of unbalanced closing bracket
+                }
+                char top = stack.pop();
+                if ((c == ')' && top != '(') || (c == ']' && top != '[') || (c == '}' && top != '{')) {
+                    return i; // Return position of unbalanced closing bracket
+                }
+            }
+        }
+
+        if (!stack.isEmpty()) {
+            char unbalanced = stack.peek();
+            for (int i = 0; i < text.length(); i++) {
+                if (text.charAt(i) == unbalanced) {
+                    return i; // Return position of unbalanced opening bracket or quote
+                }
+            }
+        }
+
+        return -1; // Return -1 if all brackets and quotes are balanced
+    }
+
 }

src/test/java/net/sf/jsqlparser/parser/CCJSqlParserUtilTest.java

@@ -491,4 +491,13 @@ public void execute() throws Throwable {
         executorService.shutdownNow();
         CCJSqlParserUtil.LOGGER.setLevel(Level.OFF);
     }
+
+    @Test
+    void testUnbalancedPosition() {
+        String sqlStr = "SELECT * from ( test ";
+        sqlStr = "select\n" +
+                " concat('{','\"dffs\":\"',if(dffs is null,'',cast(dffs as string),'\",\"djr\":\"',if(djr is null,'',cast(djr as string),'\",\"djrq\":\"',if(djrq is null,'',cast(djrq as string),'\",\"thjssj\":\"',if(thjssj is null,'',cast(thjssj as string),'\",\"thkssj\":\"',if(thkssj is null,'',cast(thkssj as string),'\",\"sjc\":\"',if(sjc is null,'',cast(sjc as string),'\",\"ldhm\":\"',if(ldhm is null,'',cast(ldhm as string),'\",\"lxdh\":\"',if(lxdh is null,'',cast(lxdh as string),'\",\"md\":\"',if(md is null,'',cast(md as string),'\",\"nr\":\"',if(nr is null,'',cast(nr as string),'\",\"nrfl\":\"',if(nrfl is null,'',cast(nrfl as string),'\",\"nrwjid\":\"',if(nrwjid is null,'',cast(nrwjid as string),'\",\"sfbm\":\"',if(sfbm is null,'',cast(sfbm as string),'\",\"sjly\":\"',if(sjly is null,'',cast(sjly as string),'\",\"wtsd\":\"',if(wtsd is null,'',cast(wtsd as string),'\",\"xb\":\"',if(xb is null,'',cast(xb as string),'\",\"xfjbh\":\"',if(xfjbh is null,'',cast(xfjbh as string),'\",\"xfjid\":\"',if(xfjid is null,'',cast(xfjid as string),'\",\"xm\":\"',if(xm is null,'',cast(xm as string),'\",\"zhut\":\"',if(zhut is null,'',cast(zhut as string),'\",\"zt\":\"',if(zt is null,'',cast(zt as string),'\"}')\n" +
+                " from tab";
+        assertEquals(-1 , CCJSqlParserUtil.getUnbalancedPosition(sqlStr));
+    }
 }

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

@@ -5672,11 +5672,10 @@ void testParameterMultiPartName() throws JSQLParserException {
         String sqlStr = "SELECT 1 FROM dual WHERE a = :paramMap.aValue";
         PlainSelect select = (PlainSelect) assertSqlCanBeParsedAndDeparsed(sqlStr, true);
 
-        assertTrue(select
+        assertEquals("paramMap.aValue", select
                 .getWhere(EqualsTo.class)
                 .getRightExpression(JdbcNamedParameter.class)
-                .getName()
-                .equals("paramMap.aValue"));
+                .getName());
     }
 
     @Test