⚡️ Speed up function extract_modified_files by 57%

[codeflash-ai]

📄 57% (0.57x) speedup for extract_modified_files in evaluation/benchmarks/swe_bench/scripts/setup/compare_patch_filename.py

⏱️ Runtime : 749 microseconds → 478 microseconds (best of 946 runs)

📝 Explanation and details

To optimize the extract_modified_files function for faster execution, especially when dealing with large patches, we can take the following steps.

1. Minimize regex usage: Using regex can be computationally expensive. If the pattern is simple enough, use string operations instead.
2. Immediate filtering: Filter lines as you iterate, which can save processing time.
3. Use list comprehension: Often faster and more concise for building lists, though here we primarily benefit from an immediate filtering mechanism.

Here's the optimized version of the code.

Changes made:

• Replaced regular expressions with str.startswith() to determine lines of interest since the check for a constant prefix is more efficient.
• Used str.find to locate the ' b/' as it avoids the overhead of regex groups and matches.
• Maintained the functionality by updating the logic to extract the filename correctly with slicing.

This approach will be significantly faster due to the reduction of regex overhead, especially on large sets of data.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 34 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Tests Coverage	100.0%

🌀 Generated Regression Tests Details

import argparse
import re

# imports
import pytest  # used for our unit tests
from evaluation.benchmarks.swe_bench.scripts.setup.compare_patch_filename import \
    extract_modified_files

# unit tests

def test_single_file_modification():
    # Test with a single file modification
    patch = "diff --git a/file1.txt b/file1.txt\n"
    codeflash_output = extract_modified_files(patch)

def test_multiple_file_modifications():
    # Test with multiple file modifications
    patch = "diff --git a/file1.txt b/file1.txt\ndiff --git a/file2.txt b/file2.txt\n"
    codeflash_output = extract_modified_files(patch)

def test_no_modifications():
    # Test with no modifications (empty patch)
    patch = ""
    codeflash_output = extract_modified_files(patch)

def test_files_with_similar_names():
    # Test with files having similar names
    patch = "diff --git a/file.txt b/file.txt\ndiff --git a/file1.txt b/file1.txt\n"
    codeflash_output = extract_modified_files(patch)

def test_nested_directories():
    # Test with files in nested directories
    patch = "diff --git a/dir/subdir/file.txt b/dir/subdir/file.txt\n"
    codeflash_output = extract_modified_files(patch)

def test_irregular_line_endings():
    # Test with mixed line endings
    patch = "diff --git a/file1.txt b/file1.txt\r\ndiff --git a/file2.txt b/file2.txt\n"
    codeflash_output = extract_modified_files(patch)

def test_files_with_special_characters():
    # Test with files having special characters in names
    patch = "diff --git a/[email protected] b/[email protected]\n"
    codeflash_output = extract_modified_files(patch)

def test_large_number_of_modifications():
    # Test with a large number of modifications
    patch = "\n".join(f"diff --git a/file{i}.txt b/file{i}.txt" for i in range(1000))
    expected_files = {f"file{i}.txt" for i in range(1000)}
    codeflash_output = extract_modified_files(patch)

def test_malformed_patch():
    # Test with a malformed patch
    patch = "some random text\ndiff --git a/file1.txt b/file1.txt\nrandom text"
    codeflash_output = extract_modified_files(patch)

def test_non_string_input():
    # Test with non-string input
    with pytest.raises(AttributeError):
        extract_modified_files(None)

def test_minimum_input_size():
    # Test with minimum valid diff line
    patch = "diff --git a/f b/f\n"
    codeflash_output = extract_modified_files(patch)

def test_maximum_file_name_length():
    # Test with maximum file name length
    long_file_name = "a" * 255
    patch = f"diff --git a/{long_file_name} b/{long_file_name}\n"
    codeflash_output = extract_modified_files(patch)
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

import argparse
import re

# imports
import pytest  # used for our unit tests
from evaluation.benchmarks.swe_bench.scripts.setup.compare_patch_filename import \
    extract_modified_files

# unit tests

def test_single_file_modification():
    # Test with a single file modification
    patch = "diff --git a/file1.txt b/file1.txt"
    codeflash_output = extract_modified_files(patch)

def test_multiple_file_modifications():
    # Test with multiple file modifications
    patch = "diff --git a/file1.txt b/file1.txt\ndiff --git a/file2.txt b/file2.txt"
    codeflash_output = extract_modified_files(patch)

def test_no_modifications():
    # Test with no modifications
    patch = ""
    codeflash_output = extract_modified_files(patch)

def test_repeated_file_modifications():
    # Test with repeated file modifications
    patch = "diff --git a/file1.txt b/file1.txt\ndiff --git a/file1.txt b/file1.txt"
    codeflash_output = extract_modified_files(patch)

def test_malformed_diff_line():
    # Test with malformed diff line
    patch = "diff --git a/ b/file1.txt"
    codeflash_output = extract_modified_files(patch)

def test_files_with_similar_names():
    # Test with files having similar names
    patch = "diff --git a/file1.txt b/file1.txt\ndiff --git a/file1.txt.backup b/file1.txt.backup"
    codeflash_output = extract_modified_files(patch)

def test_files_in_subdirectories():
    # Test with files in subdirectories
    patch = "diff --git a/src/file1.txt b/src/file1.txt\ndiff --git a/lib/file2.txt b/lib/file2.txt"
    codeflash_output = extract_modified_files(patch)

def test_files_with_special_characters():
    # Test with files having special characters
    patch = "diff --git a/[email protected] b/[email protected]\ndiff --git a/file_2#.txt b/file_2#.txt"
    codeflash_output = extract_modified_files(patch)

def test_large_patch_file():
    # Test with a large patch file
    patch = "\n".join(f"diff --git a/file{i}.txt b/file{i}.txt" for i in range(1000))
    expected_files = {f"file{i}.txt" for i in range(1000)}
    codeflash_output = extract_modified_files(patch)

def test_whitespace_variations():
    # Test with varying whitespace around diff lines
    patch = " diff --git a/file1.txt b/file1.txt"
    codeflash_output = extract_modified_files(patch)

def test_non_standard_line_endings():
    # Test with non-standard line endings
    patch = "diff --git a/file1.txt b/file1.txt\r\ndiff --git a/file2.txt b/file2.txt\r"
    codeflash_output = extract_modified_files(patch)

def test_mixed_content():
    # Test with mixed content
    patch = "# This is a comment\ndiff --git a/file1.txt b/file1.txt\nSome other text"
    codeflash_output = extract_modified_files(patch)

def test_non_standard_diff_line_prefix():
    # Test with non-standard diff line prefix
    patch = "DIFF --git a/file1.txt b/file1.txt"
    codeflash_output = extract_modified_files(patch)

def test_empty_file_paths():
    # Test with empty file paths
    patch = "diff --git a/ b/"
    codeflash_output = extract_modified_files(patch)

def test_diff_lines_with_additional_arguments():
    # Test with diff lines having additional arguments
    patch = "diff --git --binary a/file1.txt b/file1.txt"
    codeflash_output = extract_modified_files(patch)

def test_commented_out_diff_lines():
    # Test with commented-out diff lines
    patch = "# diff --git a/file1.txt b/file1.txt"
    codeflash_output = extract_modified_files(patch)

def test_diff_lines_with_missing_parts():
    # Test with diff lines missing parts
    patch = "diff --git a/file1.txt"
    codeflash_output = extract_modified_files(patch)

def test_diff_lines_with_non_ascii_characters():
    # Test with diff lines having non-ASCII characters
    patch = "diff --git a/fiłę1.txt b/fiłę1.txt\ndiff --git a/файл1.txt b/файл1.txt"
    codeflash_output = extract_modified_files(patch)

def test_interleaved_valid_and_invalid_diff_lines():
    # Test with interleaved valid and invalid diff lines
    patch = "diff --git a/file1.txt b/file1.txt\ndiff --git a/ b/\ndiff --git a/file2.txt b/file2.txt"
    codeflash_output = extract_modified_files(patch)

def test_diff_lines_with_similar_but_non_matching_patterns():
    # Test with diff lines that are similar but should not match
    patch = "diff --git a/file1.txt b/file1.txt extra\ndiff --git a/file1.txt b/file1.txt something_else"
    codeflash_output = extract_modified_files(patch)

def test_diff_lines_with_path_aliases():
    # Test with diff lines having path aliases
    patch = "diff --git a/alias/file1.txt b/alias/file1.txt"
    codeflash_output = extract_modified_files(patch)

def test_diff_lines_with_unusual_file_extensions():
    # Test with diff lines having unusual file extensions
    patch = "diff --git a/file1.unusual b/file1.unusual\ndiff --git a/file2.123 b/file2.123"
    codeflash_output = extract_modified_files(patch)
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

To edit these changes git checkout codeflash/optimize-extract_modified_files-m8wtvps0 and push.