gh-153768: Fix sqlite3 CLI completion for database names with quotes

Lib/sqlite3/_completer.py

@@ -11,6 +11,14 @@
 _completion_matches = []
 
 
+def _quote_identifier(value):
+    return '"' + value.replace('"', '""') + '"'
+
+
+def _quote_string_literal(value):
+    return "'" + value.replace("'", "''") + "'"
+
+
 def _complete(con, text, state):
     global _completion_matches
 
@@ -32,7 +40,7 @@ def _complete(con, text, state):
             # escape '_' which can appear in attached database names
             select_clauses = (
                 f"""\
-                SELECT name || ' ' FROM \"{schema}\".sqlite_master
+                SELECT name || ' ' FROM {_quote_identifier(schema)}.sqlite_master
                 WHERE name LIKE REPLACE(:text, '_', '^_') || '%' ESCAPE '^'"""
                 for schema in schemata
             )
@@ -46,8 +54,8 @@ def _complete(con, text, state):
             try:
                 select_clauses = (
                     f"""\
-                    SELECT pti.name || ' ' FROM "{schema}".sqlite_master AS sm
-                    JOIN pragma_table_xinfo(sm.name,'{schema}') AS pti
+                    SELECT pti.name || ' ' FROM {_quote_identifier(schema)}.sqlite_master AS sm
+                    JOIN pragma_table_xinfo(sm.name,{_quote_string_literal(schema)}) AS pti
                     WHERE sm.type='table' AND
                     pti.name LIKE REPLACE(:text, '_', '^_') || '%' ESCAPE '^'"""
                     for schema in schemata

Lib/test/test_sqlite3/test_cli.py

@@ -209,6 +209,30 @@ def test_color(self):
                           '\x1b[35mnear "sel": syntax error\x1b[0m', err)
 
 
+class Completer(unittest.TestCase):
+
+    def test_schema_name_with_double_quote(self):
+        from sqlite3._completer import _complete
+
+        con = sqlite3.connect(":memory:")
+        self.addCleanup(con.close)
+        con.execute("ATTACH ? AS ?", (":memory:", 'double"quote'))
+        con.execute('CREATE TABLE [double"quote].table_match(value)')
+        self.assertEqual(_complete(con, "table_", 0), "table_match ")
+
+    @unittest.skipIf(sqlite3.sqlite_version_info < (3, 16, 0),
+                     "PRAGMA table-valued function is not available until "
+                     "SQLite 3.16.0")
+    def test_schema_name_with_single_quote(self):
+        from sqlite3._completer import _complete
+
+        con = sqlite3.connect(":memory:")
+        self.addCleanup(con.close)
+        con.execute("ATTACH ? AS ?", (":memory:", "single'quote"))
+        con.execute("CREATE TABLE [single'quote].other(column_match)")
+        self.assertEqual(_complete(con, "column_", 0), "column_match ")
+
+
 @requires_subprocess()
 @force_not_colorized_test_class
 class Completion(unittest.TestCase):

Misc/NEWS.d/next/Library/2026-07-15-16-29-05.gh-issue-153768.Q-M37F.rst

@@ -0,0 +1 @@
+Fix sqlite3 CLI completion for attached database names containing quotes.