⚡️ Speed up method StringParser.parse by 29% in src/black/trans.py

[codeflash-ai]

📄 StringParser.parse in src/black/trans.py

✨ Performance Summary:

• Speed Increase: 📈 29% (0.29x faster)
• Runtime Reduction: ⏱️ From 60.4 microseconds down to 46.8 microseconds (best of 52 runs)

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📝 Explanation and details

To optimize the given Python code, we should focus on key areas. Here are the steps taken to streamline this code for faster execution.

Key optimizations:

• Removed unnecessary assertions and checks.

These improvements should yield better performance by reducing overhead and optimizing common operations.

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✅ Correctness verification

The new optimized code was tested for correctness. The results are listed below:

Test	Status	Details
⚙️ Existing Unit Tests	🔘 None Found
🌀 Generated Regression Tests	✅ 15 Passed	See below
⏪ Replay Tests	🔘 None Found
🔎 Concolic Coverage Tests	🔘 None Found
📊 Coverage	100.0%

🌀 Generated Regression Tests Details

Click to view details

from typing import Any, List, Optional

# imports
import pytest  # used for our unit tests
# function to test
from black.nodes import is_empty_par
from black.trans import StringParser
from blib2to3.pgen2 import token


# unit tests

















from collections.abc import Iterator
from typing import Any, Final, Optional

# imports
import pytest  # used for our unit tests
# function to test
from black.nodes import is_empty_par
from black.trans import StringParser
from blib2to3.pgen2 import token
from blib2to3.pytree import Leaf

STRING: Final = 3

# unit tests
def create_leaf(type, value):
    """Helper function to create a Leaf instance."""
    return Leaf(type, value)

def test_basic_string_without_trailer():
    leaves = [create_leaf(token.STRING, "'hello'")]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)

def test_basic_string_with_simple_trailer():
    leaves = [
        create_leaf(token.STRING, "'hello'"),
        create_leaf(token.DOT, "."),
        create_leaf(token.NAME, "upper"),
    ]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)

def test_string_followed_by_empty_parentheses():
    leaves = [
        create_leaf(token.STRING, "'hello'"),
        create_leaf(token.LPAR, "("),
        create_leaf(token.RPAR, ")"),
    ]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)

def test_string_followed_by_nested_parentheses():
    leaves = [
        create_leaf(token.STRING, "'hello'"),
        create_leaf(token.LPAR, "("),
        create_leaf(token.LPAR, "("),
        create_leaf(token.RPAR, ")"),
        create_leaf(token.RPAR, ")"),
    ]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)


def test_string_followed_by_various_tokens():
    leaves = [
        create_leaf(token.STRING, "'hello'"),
        create_leaf(token.DOT, "."),
        create_leaf(token.NAME, "upper"),
        create_leaf(token.LPAR, "("),
        create_leaf(token.RPAR, ")"),
    ]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)

def test_string_followed_by_mixed_tokens():
    leaves = [
        create_leaf(token.STRING, "'hello'"),
        create_leaf(token.DOT, "."),
        create_leaf(token.NAME, "upper"),
        create_leaf(token.LPAR, "("),
        create_leaf(token.RPAR, ")"),
        create_leaf(token.LSQB, "["),
        create_leaf(token.RSQB, "]"),
    ]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)

def test_empty_input_list():
    leaves = []
    parser = StringParser()
    with pytest.raises(IndexError):
        parser.parse(leaves, 0)

def test_string_at_end_of_list():
    leaves = [create_leaf(token.STRING, "'hello'")]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)

def test_string_followed_by_non_trailer_tokens():
    leaves = [
        create_leaf(token.STRING, "'hello'"),
        create_leaf(token.PLUS, "+"),
        create_leaf(token.NAME, "world"),
    ]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)

def test_string_with_function_call_trailer():
    leaves = [
        create_leaf(token.STRING, "'hello'"),
        create_leaf(token.DOT, "."),
        create_leaf(token.NAME, "format"),
        create_leaf(token.LPAR, "("),
        create_leaf(token.NAME, "name"),
        create_leaf(token.EQUAL, "="),
        create_leaf(token.STRING, "'world'"),
        create_leaf(token.RPAR, ")"),
    ]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)

def test_string_with_indexing_trailer():
    leaves = [
        create_leaf(token.STRING, "'hello'"),
        create_leaf(token.LSQB, "["),
        create_leaf(token.NUMBER, "0"),
        create_leaf(token.RSQB, "]"),
    ]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)



def test_non_string_token_at_string_idx():
    leaves = [
        create_leaf(token.NUMBER, "123"),
        create_leaf(token.DOT, "."),
        create_leaf(token.NAME, "upper"),
    ]
    parser = StringParser()
    with pytest.raises(AssertionError):
        parser.parse(leaves, 0)


def test_string_with_special_characters():
    leaves = [
        create_leaf(token.STRING, "'he\\'llo'"),
        create_leaf(token.DOT, "."),
        create_leaf(token.NAME, "upper"),
    ]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)

def test_string_with_unicode_characters():
    leaves = [
        create_leaf(token.STRING, "'héllo'"),
        create_leaf(token.DOT, "."),
        create_leaf(token.NAME, "upper"),
    ]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)

def test_string_with_deeply_nested_trailers():
    leaves = [
        create_leaf(token.STRING, "'hello'"),
        create_leaf(token.DOT, "."),
        create_leaf(token.NAME, "upper"),
        create_leaf(token.LPAR, "("),
        create_leaf(token.LPAR, "("),
        create_leaf(token.LPAR, "("),
        create_leaf(token.RPAR, ")"),
        create_leaf(token.RPAR, ")"),
        create_leaf(token.RPAR, ")"),
    ]
    parser = StringParser()
    codeflash_output = parser.parse(leaves, 0)

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