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⚡️ Speed up method CharacterRemover.remove_control_characters by 655% #15

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@codeflash-ai codeflash-ai bot commented Feb 17, 2025

📄 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.

Codeflash

@codeflash-ai
⚡️ Speed up method CharacterRemover.remove_control_characters by 655%
d68362a 
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.
@codeflash-ai codeflash-ai bot added the ⚡️ codeflash Optimization PR opened by Codeflash AI label Feb 17, 2025
@codeflash-ai codeflash-ai bot requested a review from alvin-r February 17, 2025 13:57
@alvin-r alvin-r closed this Feb 17, 2025
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