⚡️ Speed up method CharacterRemover.remove_control_characters by 655%

[codeflash-ai]

📄 655% (6.55x) speedup for CharacterRemover.remove_control_characters in code_to_optimize/remove_control_chars.py

⏱️ Runtime : 1.78 millisecond → 236 microseconds (best of 1287 runs)

📝 Explanation and details

Certainly! To optimize the program, we can use the str.translate method with a translation table to remove the control characters, which is generally faster than regular expressions.

The str.translate method with a translation table is faster than re.sub for this specific task because it operates at a lower level, directly modifying the characters in the string based on the translation table. This reduces the overhead associated with regular expression parsing.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 90 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
	🔘 None Found
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests Details

import re # imports import pytest # used for our unit tests from code_to_optimize.remove_control_chars import CharacterRemover # unit tests def test_basic_functionality(): remover = CharacterRemover() # String with control characters codeflash_output = remover.remove_control_characters("Hello\x00World") codeflash_output = remover.remove_control_characters("Line1\x0ALine2\x0DLine3") codeflash_output = remover.remove_control_characters("\x01\x02\x03Test\x04\x05") # String without control characters codeflash_output = remover.remove_control_characters("HelloWorld") codeflash_output = remover.remove_control_characters("This is a test string.") codeflash_output = remover.remove_control_characters("1234567890") def test_edge_cases(): remover = CharacterRemover() # Empty string codeflash_output = remover.remove_control_characters("") # None input codeflash_output = remover.remove_control_characters(None) # String with only control characters codeflash_output = remover.remove_control_characters("\x00\x01\x02\x03\x04") codeflash_output = remover.remove_control_characters("\x0A\x0D\x1F\x7F") def test_mixed_content(): remover = CharacterRemover() # String with mixed control and non-control characters codeflash_output = remover.remove_control_characters("Hello\x00\x01World\x02\x03") codeflash_output = remover.remove_control_characters("Start\x0A\x0DMiddle\x1F\x7FEnd") def test_unicode_and_non_ascii_characters(): remover = CharacterRemover() # String with non-ASCII characters codeflash_output = remover.remove_control_characters("こんにちは\x00世界") codeflash_output = remover.remove_control_characters("Привет\x0Aмир") # String with Unicode control characters (function does not handle these) codeflash_output = remover.remove_control_characters("Test\u2028String") codeflash_output = remover.remove_control_characters("Test\u2029String") def test_large_scale(): remover = CharacterRemover() # Large string with control characters codeflash_output = remover.remove_control_characters("A" * 1000 + "\x00" + "B" * 1000) codeflash_output = remover.remove_control_characters("\x01" * 10000 + "Hello" + "\x02" * 10000) # Large string without control characters codeflash_output = remover.remove_control_characters("A" * 100000) codeflash_output = remover.remove_control_characters("The quick brown fox jumps over the lazy dog." * 1000) def test_special_characters(): remover = CharacterRemover() # String with special characters but no control characters codeflash_output = remover.remove_control_characters("!@#$%^&*()_+-=[]{}|;':,.<>/?") codeflash_output = remover.remove_control_characters("~`") def test_whitespace_characters(): remover = CharacterRemover() # String with whitespace characters codeflash_output = remover.remove_control_characters(" \t\n\r\f\v") codeflash_output = remover.remove_control_characters("Hello \t World \n") def test_escape_sequences(): remover = CharacterRemover() # String with escape sequences codeflash_output = remover.remove_control_characters("Hello\\nWorld") codeflash_output = remover.remove_control_characters("Line1\\tLine2\\nLine3") def test_repeated_patterns(): remover = CharacterRemover() # String with repeated patterns of control characters codeflash_output = remover.remove_control_characters("\x00\x01\x02" * 100) codeflash_output = remover.remove_control_characters("\x0A\x0D\x1F" * 50 + "Text" + "\x7F" * 50) def test_embedded_null_characters(): remover = CharacterRemover() # String with embedded null characters codeflash_output = remover.remove_control_characters("Hello\x00World\x00") codeflash_output = remover.remove_control_characters("Test\x00String\x00With\x00Nulls") # codeflash_output is used to check that the output of the original code is the same as that of the optimized code. import re # imports import pytest # used for our unit tests from code_to_optimize.remove_control_chars import CharacterRemover # unit tests # Basic Functionality def test_basic_with_control_characters(): remover = CharacterRemover() codeflash_output = remover.remove_control_characters("Hello\x00World") codeflash_output = remover.remove_control_characters("Line1\x0ALine2\x0DLine3") codeflash_output = remover.remove_control_characters("\x07Bell character") def test_basic_without_control_characters(): remover = CharacterRemover() codeflash_output = remover.remove_control_characters("Hello World") codeflash_output = remover.remove_control_characters("Just a normal string") codeflash_output = remover.remove_control_characters("1234567890") # Empty and None Inputs def test_empty_string(): remover = CharacterRemover() codeflash_output = remover.remove_control_characters("") def test_none_input(): remover = CharacterRemover() codeflash_output = remover.remove_control_characters(None) # Strings with only control characters def test_only_control_characters(): remover = CharacterRemover() codeflash_output = remover.remove_control_characters("\x00\x01\x02") codeflash_output = remover.remove_control_characters("\x1F\x7F") codeflash_output = remover.remove_control_characters("\x0A\x0D") # Mixed Content Strings def test_mixed_content_strings(): remover = CharacterRemover() codeflash_output = remover.remove_control_characters("Hello\x00\x01\x02World") codeflash_output = remover.remove_control_characters("Line1\x0ALine2\x0DLine3\x7F") codeflash_output = remover.remove_control_characters("Start\x00Middle\x1FEnd") # Edge Cases def test_boundary_control_characters(): remover = CharacterRemover() codeflash_output = remover.remove_control_characters("\x00") codeflash_output = remover.remove_control_characters("\x1F") codeflash_output = remover.remove_control_characters("\x7F") def test_non_ascii_characters(): remover = CharacterRemover() codeflash_output = remover.remove_control_characters("Hello\x00World\u2028") codeflash_output = remover.remove_control_characters("Line1\x0ALine2\u2029Line3") codeflash_output = remover.remove_control_characters("\x07Bell character\u200B") # Large Inputs def test_large_string_with_control_characters(): remover = CharacterRemover() large_input = "A" * 10000 + "\x00" + "B" * 10000 expected_output = "A" * 10000 + "B" * 10000 codeflash_output = remover.remove_control_characters(large_input) large_input = "C" * 5000 + "\x1F" + "D" * 5000 + "\x7F" + "E" * 5000 expected_output = "C" * 5000 + "D" * 5000 + "E" * 5000 codeflash_output = remover.remove_control_characters(large_input) def test_large_string_without_control_characters(): remover = CharacterRemover() large_input = "A" * 30000 codeflash_output = remover.remove_control_characters(large_input) large_input = "B" * 20000 + "C" * 10000 codeflash_output = remover.remove_control_characters(large_input) # Special Characters and Whitespace def test_special_characters_and_whitespace(): remover = CharacterRemover() codeflash_output = remover.remove_control_characters("Hello\nWorld\t!") codeflash_output = remover.remove_control_characters(" \x00 \x01 \x02 ") codeflash_output = remover.remove_control_characters("\x0A\x0D\x09") # Unicode and Multibyte Characters def test_unicode_characters(): remover = CharacterRemover() codeflash_output = remover.remove_control_characters("Hello\u2028World") codeflash_output = remover.remove_control_characters("Line1\u2029Line2") codeflash_output = remover.remove_control_characters("Start\u200BMiddle\u200BEnd") # Strings with Escape Sequences def test_strings_with_escape_sequences(): remover = CharacterRemover() codeflash_output = remover.remove_control_characters("Hello\\x00World") codeflash_output = remover.remove_control_characters("Line1\\x0ALine2\\x0DLine3") codeflash_output = remover.remove_control_characters("Start\\x00Middle\\x1FEnd") # Strings with Various Data Types def test_strings_with_various_data_types(): remover = CharacterRemover() codeflash_output = remover.remove_control_characters("123\x00123") codeflash_output = remover.remove_control_characters("!@#$%^&*()_+\x00") codeflash_output = remover.remove_control_characters("abc\x01def\x02ghi") # codeflash_output is used to check that the output of the original code is the same as that of the optimized code.