"""
Test lldb data formatter callback-based matching.
"""

import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
from lldbsuite.test import lldbutil


class PythonSynthDataFormatterTestCase(TestBase):

    def setUp(self):
        # Call super's setUp().
        TestBase.setUp(self)
        # Find the line number to break at.
        self.line = line_number('main.cpp', '// Set break point at this line.')

    def test_callback_matchers(self):
        """Test data formatter commands."""
        self.build()

        _, process, thread, _ = lldbutil.run_to_line_breakpoint(
            self, lldb.SBFileSpec("main.cpp"), self.line)

        # Print derived without a formatter.
        self.expect("frame variable derived",
                    substrs=['x = 2222',
                             'y = 3333'])

        # now set up a summary function that uses a python callback to match
        # classes that derive from `Base`.
        self.runCmd("command script import --allow-reload ./formatters_with_callback.py")

        # Now `derived` should use our callback summary + synthetic children.
        self.expect("frame variable derived",
                    substrs=['hello from callback summary',
                             'synthetic_child = 9999'])

        # But not other classes.
        self.expect("frame variable base", matching=False,
                    substrs=['hello from callback summary'])
        self.expect("frame variable base",
                    substrs=['x = 1111'])

        self.expect("frame variable nd", matching=False,
                    substrs=['hello from callback summary'])
        self.expect("frame variable nd",
                    substrs=['z = 4444'])