⚡️ Speed up function parse_git_header by 9%

[codeflash-ai]

📄 9% (0.09x) speedup for parse_git_header in openhands/resolver/patching/patch.py

⏱️ Runtime : 446 microseconds → 409 microseconds (best of 1293 runs)

📝 Explanation and details

Optimization Explanation:

• The loops and checks are streamlined to minimize repeated condition checks, improving runtime, especially for long text inputs.
• Utilized tuple unpacking where possible to make the assignment of variables more concise.
• Reduced redundant conditional checks after ascertainable headers were found.
• The program continues processing once it has enough information to return the header, eliminating unnecessary parsing, especially when paths and versions are already determined.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 23 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	✅ 2 Passed
📊 Tests Coverage	95.1%

🌀 Generated Regression Tests Details

import re
from collections import namedtuple

# imports
import pytest  # used for our unit tests
from openhands.resolver.patching.patch import parse_git_header

# function to test
# -*- coding: utf-8 -*-


header = namedtuple(
    'header',
    'index_path old_path old_version new_path new_version',
)

# Headers
git_diffcmd_header = re.compile('^diff --git a/(.+) b/(.+))
git_header_index = re.compile(r'^index ([a-f0-9]+)..([a-f0-9]+) ?(\d*))
git_header_old_line = re.compile('^--- (.+))
git_header_new_line = re.compile(r'^\+\+\+ (.+))
git_header_binary_file = re.compile('^Binary files (.+) and (.+) differ')
from openhands.resolver.patching.patch import parse_git_header

# unit tests

def test_standard_git_diff_header():
    # Test a standard git diff header
    input_text = """diff --git a/file1.txt b/file1.txt
index 1234567..89abcde 100644
--- a/file1.txt
+++ b/file1.txt"""
    expected = header(
        index_path=None,
        old_path='file1.txt',
        old_version='1234567',
        new_path='file1.txt',
        new_version='89abcde'
    )
    codeflash_output = parse_git_header(input_text)

def test_missing_new_version():
    # Test when the new version is missing
    input_text = """diff --git a/file1.txt b/file1.txt
index 1234567..
--- a/file1.txt
+++ b/file1.txt"""
    expected = header(
        index_path=None,
        old_path='file1.txt',
        old_version='1234567',
        new_path='file1.txt',
        new_version=None
    )
    codeflash_output = parse_git_header(input_text)

def test_binary_file_diff():
    # Test a binary file diff
    input_text = "Binary files a/file1.bin and b/file1.bin differ"
    expected = header(
        index_path=None,
        old_path='file1.bin',
        old_version=None,
        new_path='file1.bin',
        new_version=None
    )
    codeflash_output = parse_git_header(input_text)

def test_new_file():
    # Test a newly added file
    input_text = """diff --git a/dev/null b/file2.txt
new file mode 100644
index 0000000..1234567
--- /dev/null
+++ b/file2.txt"""
    expected = header(
        index_path=None,
        old_path='/dev/null',
        old_version='0000000',
        new_path='file2.txt',
        new_version='1234567'
    )
    codeflash_output = parse_git_header(input_text)

def test_deleted_file():
    # Test a deleted file
    input_text = """diff --git a/file3.txt b/dev/null
deleted file mode 100644
index 1234567..0000000
--- a/file3.txt
+++ /dev/null"""
    expected = header(
        index_path=None,
        old_path='file3.txt',
        old_version='1234567',
        new_path='/dev/null',
        new_version='0000000'
    )
    codeflash_output = parse_git_header(input_text)

def test_empty_input():
    # Test empty input
    codeflash_output = parse_git_header("")
    codeflash_output = parse_git_header([])

def test_non_git_diff_format():
    # Test input that does not match any expected diff format
    codeflash_output = parse_git_header("random text")

def test_malformed_diff_header():
    # Test a malformed diff header
    input_text = """diff --git a/file1.txt b/file2.txt
index 1234567..89abcde
--- a/file1.txt"""
    codeflash_output = parse_git_header(input_text)

def test_large_diff_header():
    # Test a large diff header
    input_text = "\n".join([
        "diff --git a/file{}.txt b/file{}.txt".format(i, i) +
        "\nindex 1234567..89abcde\n--- a/file{}.txt\n+++ b/file{}.txt".format(i, i)
        for i in range(1000)
    ])
    expected = header(
        index_path=None,
        old_path='file999.txt',
        old_version='1234567',
        new_path='file999.txt',
        new_version='89abcde'
    )
    codeflash_output = parse_git_header(input_text.splitlines()[-4:])

def test_path_with_special_characters():
    # Test paths with special characters
    input_text = """diff --git a/file@name.txt b/file@name.txt
index 1234567..89abcde
--- a/file@name.txt
+++ b/file@name.txt"""
    expected = header(
        index_path=None,
        old_path='file@name.txt',
        old_version='1234567',
        new_path='file@name.txt',
        new_version='89abcde'
    )
    codeflash_output = parse_git_header(input_text)

def test_version_with_non_hex_characters():
    # Test versions with non-hex characters
    input_text = """diff --git a/file1.txt b/file1.txt
index 12345g7..89abcde
--- a/file1.txt
+++ b/file1.txt"""
    expected = header(
        index_path=None,
        old_path='file1.txt',
        old_version='12345g7',
        new_path='file1.txt',
        new_version='89abcde'
    )
    codeflash_output = parse_git_header(input_text)
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

import re
from collections import namedtuple

# imports
import pytest  # used for our unit tests
from openhands.resolver.patching.patch import parse_git_header

# function to test
# -*- coding: utf-8 -*-


header = namedtuple(
    'header',
    'index_path old_path old_version new_path new_version',
)

# Headers

# git has a special index header and no end part
git_diffcmd_header = re.compile('^diff --git a/(.+) b/(.+))
git_header_index = re.compile(r'^index ([a-f0-9]+)..([a-f0-9]+) ?(\d*))
git_header_old_line = re.compile('^--- (.+))
git_header_new_line = re.compile(r'^\+\+\+ (.+))
git_header_binary_file = re.compile('^Binary files (.+) and (.+) differ')
from openhands.resolver.patching.patch import parse_git_header

# unit tests

def test_standard_git_diff_header():
    # Test a standard git diff header
    text = """diff --git a/file1.txt b/file1.txt
index 1234567..89abcde 100644
--- a/file1.txt
+++ b/file1.txt"""
    expected = header(index_path=None, old_path='file1.txt', old_version='1234567', new_path='file1.txt', new_version='89abcde')
    codeflash_output = parse_git_header(text)

def test_binary_file_difference():
    # Test a binary file difference
    text = """diff --git a/file1.bin b/file1.bin
Binary files a/file1.bin and b/file1.bin differ"""
    expected = header(index_path=None, old_path='file1.bin', old_version=None, new_path='file1.bin', new_version=None)
    codeflash_output = parse_git_header(text)

def test_missing_information():
    # Test missing old path
    text = """diff --git a/file1.txt b/file1.txt
index 1234567..89abcde 100644
+++ b/file1.txt"""
    codeflash_output = parse_git_header(text)

def test_special_characters_in_paths():
    # Test paths with spaces
    text = """diff --git a/file with spaces.txt b/file with spaces.txt
index 1234567..89abcde 100644
--- a/file with spaces.txt
+++ b/file with spaces.txt"""
    expected = header(index_path=None, old_path='file with spaces.txt', old_version='1234567', new_path='file with spaces.txt', new_version='89abcde')
    codeflash_output = parse_git_header(text)

def test_zeroed_out_versions():
    # Test zeroed out versions indicating file creation
    text = """diff --git a/newfile.txt b/newfile.txt
index 0000000..89abcde
--- /dev/null
+++ b/newfile.txt"""
    expected = header(index_path=None, old_path='/dev/null', old_version='0000000', new_path='newfile.txt', new_version='89abcde')
    codeflash_output = parse_git_header(text)

def test_malformed_headers():
    # Test malformed git header
    text = "diff --git a/file1.txt b/file1.txt"
    codeflash_output = parse_git_header(text)

def test_non_git_diff_text():
    # Test non-git diff text
    text = "This is just some random text."
    codeflash_output = parse_git_header(text)

def test_large_number_of_lines():
    # Test with a large number of lines
    text = "diff --git a/file1.txt b/file1.txt\n" + "\n".join(["line"] * 1000)
    codeflash_output = parse_git_header(text)

def test_mixed_diff_types():
    # Test mixed diff types
    text = """diff --git a/file1.txt b/file1.txt
index 1234567..89abcde 100644
--- a/file1.txt
+++ b/file1.txt
Binary files a/file1.bin and b/file1.bin differ"""
    expected = header(index_path=None, old_path='file1.txt', old_version='1234567', new_path='file1.txt', new_version='89abcde')
    codeflash_output = parse_git_header(text)

def test_interleaved_headers():
    # Test interleaved headers
    text = """diff --git a/file1.txt b/file1.txt
--- a/file1.txt
Binary files a/file1.bin and b/file1.bin differ
index 1234567..89abcde 100644
+++ b/file1.txt"""
    expected = header(index_path=None, old_path='file1.txt', old_version='1234567', new_path='file1.txt', new_version='89abcde')
    codeflash_output = parse_git_header(text)

def test_whitespace_variations():
    # Test headers with varying whitespace
    text = """diff --git a/file1.txt   b/file1.txt
index 1234567..89abcde 100644
--- a/file1.txt
+++ b/file1.txt"""
    expected = header(index_path=None, old_path='file1.txt', old_version='1234567', new_path='file1.txt', new_version='89abcde')
    codeflash_output = parse_git_header(text)
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

from openhands.resolver.patching.patch import parse_git_header

def test_parse_git_header():
    parse_git_header('\x1f')

def test_parse_git_header_2():
    parse_git_header(['\x00'])

To edit these changes git checkout codeflash/optimize-parse_git_header-m8x5sqez and push.