from lldbsuite.test.decorators import *
from lldbsuite.test.lldbpexpect import PExpectTest
from lldbsuite.test.lldbtest import *


class TestCase(PExpectTest):
    def expect_repl(self, expr, substrs=[]):
        """Evaluates the expression in the REPL and verifies that the list
        of substrs is in the REPL output."""
        # Only single line expressions supported.
        self.assertNotIn("\n", expr)
        self.child.send(expr + "\n")
        for substr in substrs:
            self.child.expect_exact(substr)
        # Look for the start of the next REPL input line.
        self.current_repl_line_number += 1
        self.child.expect_exact(str(self.current_repl_line_number) + ">")

    def start_repl(self):
        self.build()
        self.current_repl_line_number = 1

        self.launch(executable=self.getBuildArtifact("a.out"), dimensions=(100, 500))
        # Try launching the REPL before we have a running target.
        self.expect(
            "expression --repl -l c --",
            substrs=["REPL requires a running target process."],
        )

        self.expect("b main", substrs=["Breakpoint 1", "address ="])
        self.expect("run", substrs=["stop reason = breakpoint 1"])

        # Start the REPL.
        self.child.send("expression --repl -l c --\n")
        self.child.expect_exact("1>")

    # PExpect uses many timeouts internally and doesn't play well
    # under ASAN on a loaded machine..
    @skipIfAsan
    @skipIf(oslist=["linux"], archs=["arm$", "aarch64"])  # Randomly fails on buildbot
    @skipIfEditlineSupportMissing
    def test_basic_completion(self):
        """Test that we can complete a simple multiline expression"""
        self.start_repl()
        # Try evaluating a simple expression.
        self.expect_repl("3 + 3", substrs=["(int) $0 = 6"])

        # Try declaring a persistent variable.
        self.expect_repl(
            "long $persistent = 7; 5",
            substrs=["(int) $1 = 5", "(long) $persistent = 7"],
        )

        # Try using the persistent variable from before.
        self.expect_repl("$persistent + 10", substrs=["(long) $2 = 17"])


    # PExpect uses many timeouts internally and doesn't play well
    # under ASAN on a loaded machine..
    @skipIfAsan
    @skipIf(oslist=["linux"], archs=["arm$", "aarch64"])  # Randomly fails on buildbot
    @skipIfEditlineSupportMissing
    def test_completion_with_space_only_line(self):
        """Test that we don't crash when completing lines with spaces only"""
        self.start_repl()

        self.child.send("   ")
        self.child.send("\t")
        self.expect_repl("3 + 3", substrs=["(int) $0 = 6"])
