⚡️ Speed up function parse_header by 25%

[codeflash-ai]

📄 25% (0.25x) speedup for parse_header in openhands/resolver/patching/patch.py

⏱️ Runtime : 2.81 milliseconds → 2.25 milliseconds (best of 1279 runs)

📝 Explanation and details

Changes Made for Optimization.

1. Simplified Return: parse_header directly returns the result of parse_scm_header or parse_diff_header, avoiding unnecessary assignment and branch checks.

2. Removal of Redundant Checks: Removed second redundant findall_regex (for git_opt) to minimize duplication of regex operations.

3. In-place String Manipulation: Simplified the path string manipulation using namedtuple's _replace() which is more idiomatic in this context and prevents multiple return statements.

4. Concise Truth Value Testing: Replaced len(diffs) > 0 with direct truthiness check which is more Pythonic and efficient.

These changes streamline the execution, making it quicker while keeping the functionality intact.

✅ Correctness verification report:

Test	Status
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 19 Passed
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	✅ 1 Passed
📊 Tests Coverage	100.0%

🌀 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_header

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

header = namedtuple(
    'header',
    'index_path old_path old_version new_path new_version',
)
from openhands.resolver.patching.patch import parse_header

# unit tests

def test_valid_git_header():
    # Test a valid Git header
    text = """diff --git a/foo.txt b/foo.txt
index 1234567..89abcde 100644
--- a/foo.txt
+++ b/foo.txt
"""
    expected = header(index_path=None, old_path='foo.txt', old_version='1234567', new_path='foo.txt', new_version='89abcde')
    codeflash_output = parse_header(text)

def test_valid_svn_header():
    # Test a valid SVN header
    text = """Index: foo.txt
===================================================================
--- foo.txt    (revision 123)
+++ foo.txt    (working copy)
"""
    expected = header(index_path='foo.txt', old_path='foo.txt', old_version=123, new_path='foo.txt', new_version=None)
    codeflash_output = parse_header(text)

def test_valid_cvs_header():
    # Test a valid CVS header
    text = """RCS file: /cvsroot/foo.txt,v
retrieving revision 1.1
diff -u -r1.1 foo.txt
--- foo.txt    2023-01-01 12:00:00.000000000 +0000
+++ foo.txt    2023-01-02 12:00:00.000000000 +0000
"""
    expected = header(index_path='/cvsroot/foo.txt,v', old_path='foo.txt', old_version=None, new_path='foo.txt', new_version=None)
    codeflash_output = parse_header(text)

def test_valid_unified_header():
    # Test a valid unified diff header
    text = """--- foo.txt    2023-01-01 12:00:00.000000000 +0000
+++ foo.txt    2023-01-02 12:00:00.000000000 +0000
"""
    expected = header(index_path=None, old_path='foo.txt', old_version='2023-01-01 12:00:00.000000000 +0000', new_path='foo.txt', new_version='2023-01-02 12:00:00.000000000 +0000')
    codeflash_output = parse_header(text)

def test_valid_context_header():
    # Test a valid context diff header
    text = """*** foo.txt    2023-01-01 12:00:00.000000000 +0000
--- foo.txt    2023-01-02 12:00:00.000000000 +0000
"""
    expected = header(index_path=None, old_path='foo.txt', old_version='2023-01-01 12:00:00.000000000 +0000', new_path='foo.txt', new_version='2023-01-02 12:00:00.000000000 +0000')
    codeflash_output = parse_header(text)

def test_empty_input():
    # Test empty input
    codeflash_output = parse_header('')
    codeflash_output = parse_header([])

def test_malformed_header():
    # Test a malformed header
    text = """diff --git a/foo.txt b/foo.txt
index 1234567..89abcde 100644
--- a/foo.txt
"""
    codeflash_output = parse_header(text)

def test_large_input():
    # Test with a large input
    text = """diff --git a/foo.txt b/foo.txt
index 1234567..89abcde 100644
--- a/foo.txt
+++ b/foo.txt
""" * 1000  # Repeat to simulate large input
    expected = header(index_path=None, old_path='foo.txt', old_version='1234567', new_path='foo.txt', new_version='89abcde')
    codeflash_output = parse_header(text)

def test_unrecognized_format():
    # Test with unrecognized format
    text = """This is not a diff header"""
    codeflash_output = parse_header(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_header

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


header = namedtuple(
    'header',
    'index_path old_path old_version new_path new_version',
)
from openhands.resolver.patching.patch import parse_header


# unit tests
def test_parse_header_git():
    # Test with a simple Git diff header
    text = """diff --git a/file1.txt b/file1.txt
index 83db48f..f735c3f 100644
--- a/file1.txt
+++ b/file1.txt"""
    expected = header(index_path=None, old_path='file1.txt', old_version='83db48f', new_path='file1.txt', new_version='f735c3f')
    codeflash_output = parse_header(text)

def test_parse_header_svn():
    # Test with a simple SVN diff header
    text = """Index: file1.txt
===================================================================
--- file1.txt  (revision 123)
+++ file1.txt  (working copy)"""
    expected = header(index_path='file1.txt', old_path='file1.txt', old_version=123, new_path='file1.txt', new_version=None)
    codeflash_output = parse_header(text)

def test_parse_header_cvs():
    # Test with a simple CVS diff header
    text = """RCS file: /cvsroot/project/file1.txt,v
retrieving revision 1.1
diff -r1.1 file1.txt"""
    expected = header(index_path='/cvsroot/project/file1.txt', old_path='file1.txt', old_version='1.1', new_path='file1.txt', new_version=None)
    codeflash_output = parse_header(text)

def test_parse_header_unified():
    # Test with a simple unified diff header
    text = """--- file1.txt 2023-01-01 12:00:00.000000000 +0000
+++ file1.txt 2023-01-02 12:00:00.000000000 +0000"""
    expected = header(index_path=None, old_path='file1.txt', old_version='2023-01-01 12:00:00.000000000 +0000', new_path='file1.txt', new_version='2023-01-02 12:00:00.000000000 +0000')
    codeflash_output = parse_header(text)

def test_parse_header_empty():
    # Test with empty input
    text = ""
    codeflash_output = parse_header(text)

def test_parse_header_malformed():
    # Test with malformed header
    text = "some random text"
    codeflash_output = parse_header(text)

def test_parse_header_large():
    # Test with a large diff file
    text = "\n".join(["diff --git a/file1.txt b/file1.txt"] * 1000)
    codeflash_output = parse_header(text)

def test_parse_header_special_characters():
    # Test with special characters in paths
    text = """diff --git a/file with spaces.txt b/file with spaces.txt
index 83db48f..f735c3f 100644
--- a/file with spaces.txt
+++ b/file with spaces.txt"""
    expected = header(index_path=None, old_path='file with spaces.txt', old_version='83db48f', new_path='file with spaces.txt', new_version='f735c3f')
    codeflash_output = parse_header(text)

def test_parse_header_mixed_vcs():
    # Test with mixed VCS headers
    text = """Index: file1.txt
===================================================================
--- file1.txt  (revision 123)
+++ file1.txt  (working copy)
diff --git a/file1.txt b/file1.txt
index 83db48f..f735c3f 100644"""
    expected = header(index_path='file1.txt', old_path='file1.txt', old_version=123, new_path='file1.txt', new_version=None)
    codeflash_output = parse_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_header

def test_parse_header():
    parse_header(['\x00'])

To edit these changes git checkout codeflash/optimize-parse_header-m8x5epj4 and push.