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"""

Dependency version management for testing.

Generates requirements files for min and default dependency versions.

For min versions, creates flexible constraints (e.g., >=1.2.5,<1.3.0) to allow

compatible patch updates instead of pinning exact versions.

"""

import toml

import sys

import argparse

from packaging.specifiers import SpecifierSet

from packaging.requirements import Requirement

from pathlib import Path

class DependencyManager:

def __init__(self, pyproject_path="pyproject.toml"):

self.pyproject_path = Path(pyproject_path)

self.dependencies = self._load_dependencies()

# Map of packages that need specific transitive dependency constraints when downgraded

self.transitive_dependencies = {

'pandas': {

# When pandas is downgraded to 1.x, ensure numpy compatibility

'numpy': {

'min_constraint': '>=1.16.5,<2.0.0', # pandas 1.x works with numpy 1.x

'applies_when': lambda version: version.startswith('1.')

}

def _load_dependencies(self):

"""Load dependencies from pyproject.toml"""

with open(self.pyproject_path, 'r') as f:

pyproject = toml.load(f)

return pyproject['tool']['poetry']['dependencies']

def _parse_constraint(self, name, constraint):

"""Parse a dependency constraint into version info"""

if isinstance(constraint, str):

return constraint, False # version_constraint, is_optional

elif isinstance(constraint, list):

# Handle complex constraints like pandas/pyarrow with Python version markers

current_python = sys.version_info

current_version = f"{current_python.major}.{current_python.minor}"

# Find the constraint that matches the current Python version

for item in constraint:

if 'python' in item:

python_spec = item['python']

# Parse the Python version specifier

spec_set = SpecifierSet(python_spec)

# Check if current Python version matches this constraint

if current_version in spec_set:

version = item['version']

is_optional = item.get('optional', False)

return version, is_optional

# Fallback to first constraint if no Python version match

first_constraint = constraint[0]

version = first_constraint['version']

is_optional = first_constraint.get('optional', False)

return version, is_optional

elif isinstance(constraint, dict):

if 'version' in constraint:

return constraint['version'], constraint.get('optional', False)

return None, False

def _extract_versions_from_specifier(self, spec_set_str):

"""Extract minimum version from a specifier set"""

try:

# Handle caret (^) and tilde (~, ~=) constraints that packaging doesn't

# support (Poetry ^, Poetry ~, and PEP 440 ~=).

if spec_set_str.startswith('^'):

# ^1.2.3 means >=1.2.3, <2.0.0

min_version = spec_set_str[1:] # Remove ^

return min_version, None

elif spec_set_str.startswith('~='):

# PEP 440 compatible release: ~=1.2.3 means >=1.2.3, <1.3.0

min_version = spec_set_str[2:] # Remove ~=

return min_version, None

elif spec_set_str.startswith('~'):

# Poetry tilde: ~1.2.3 means >=1.2.3, <1.3.0

min_version = spec_set_str[1:] # Remove ~

return min_version, None

spec_set = SpecifierSet(spec_set_str)

min_version = None

for spec in spec_set:

if spec.operator in ('>=', '=='):

min_version = spec.version

break

return min_version, None

except Exception as e:

print(f"Warning: Could not parse constraint '{spec_set_str}': {e}", file=sys.stderr)

return None, None

def _create_flexible_minimum_constraint(self, package_name, min_version):

"""Create a flexible minimum constraint that allows compatible updates"""

try:

# Split version into parts

version_parts = min_version.split('.')

if len(version_parts) >= 2:

major = version_parts[0]

minor = version_parts[1]

# Special handling for packages that commonly have conflicts

# For these packages, use wider constraints to allow more compatibility

if package_name in ['requests', 'urllib3', 'pandas']:

# Use wider constraint: >=min_version,<next_major

# e.g., 2.18.1 becomes >=2.18.1,<3.0.0

next_major = int(major) + 1

upper_bound = f"{next_major}.0.0"

return f"{package_name}>={min_version},<{upper_bound}"

else:

# For other packages, use minor version constraint

# e.g., 1.2.5 becomes >=1.2.5,<1.3.0

next_minor = int(minor) + 1

upper_bound = f"{major}.{next_minor}.0"

return f"{package_name}>={min_version},<{upper_bound}"

else:

# If version doesn't have minor version, just use exact version

return f"{package_name}=={min_version}"

except (ValueError, IndexError) as e:

print(f"Warning: Could not create flexible constraint for {package_name}=={min_version}: {e}", file=sys.stderr)

# Fallback to exact version

return f"{package_name}=={min_version}"

def _get_transitive_dependencies(self, package_name, version, version_type):

"""Get transitive dependencies that need specific constraints based on the main package version"""

transitive_reqs = []

if package_name in self.transitive_dependencies:

transitive_deps = self.transitive_dependencies[package_name]

for dep_name, dep_config in transitive_deps.items():

# Check if this transitive dependency applies for this version

if dep_config['applies_when'](version):

if version_type == "min":

# Use the predefined constraint for minimum versions

constraint = dep_config['min_constraint']

transitive_reqs.append(f"{dep_name}{constraint}")

# For default version_type, we don't add transitive deps as Poetry handles them

return transitive_reqs

def generate_requirements(self, version_type="min", include_optional=False):

"""

Generate requirements for specified version type.

Args:

version_type: "min" or "default"

include_optional: Whether to include optional dependencies

"""

requirements = []

transitive_requirements = []

for name, constraint in self.dependencies.items():

if name == 'python':

continue

version_constraint, is_optional = self._parse_constraint(name, constraint)

if not version_constraint:

continue

if is_optional and not include_optional:

continue

if version_type == "default":

# For default, just use the constraint as-is (let poetry resolve)

requirements.append(f"{name}{version_constraint}")

elif version_type == "min":

min_version, _ = self._extract_versions_from_specifier(version_constraint)

if min_version:

# Create flexible constraint that allows patch updates for compatibility

flexible_constraint = self._create_flexible_minimum_constraint(name, min_version)

requirements.append(flexible_constraint)

# Check if this package needs specific transitive dependencies

transitive_deps = self._get_transitive_dependencies(name, min_version, version_type)

transitive_requirements.extend(transitive_deps)

# Combine main requirements with transitive requirements

all_requirements = requirements + transitive_requirements

# Remove duplicates (prefer main requirements over transitive ones)

seen_packages = set()

final_requirements = []

# First add main requirements

for req in requirements:

package_name = Requirement(req).name

seen_packages.add(package_name)

final_requirements.append(req)

# Then add transitive requirements that don't conflict

for req in transitive_requirements:

package_name = Requirement(req).name

if package_name not in seen_packages:

final_requirements.append(req)

return final_requirements

def write_requirements_file(self, filename, version_type="min", include_optional=False):

"""Write requirements to a file"""

requirements = self.generate_requirements(version_type, include_optional)

with open(filename, 'w') as f:

if version_type == "min":

f.write(f"# Minimum compatible dependency versions generated from pyproject.toml\n")

f.write(f"# Uses flexible constraints to resolve compatibility conflicts:\n")

f.write(f"# - Common packages (requests, urllib3, pandas): >=min,<next_major\n")

f.write(f"# - Other packages: >=min,<next_minor\n")

f.write(f"# - Includes transitive dependencies (e.g., numpy for pandas)\n")

else:

f.write(f"# {version_type.title()} dependency versions generated from pyproject.toml\n")

for req in sorted(requirements):

f.write(f"{req}\n")

print(f"Generated {filename} with {len(requirements)} dependencies")

return requirements

def main():

parser = argparse.ArgumentParser(description="Manage dependency versions for testing")

parser.add_argument("version_type", choices=["min", "default"],

help="Type of versions to generate")

parser.add_argument("--output", "-o", default=None,

help="Output requirements file (default: requirements-{version_type}.txt)")

parser.add_argument("--include-optional", action="store_true",

help="Include optional dependencies")

parser.add_argument("--pyproject", default="pyproject.toml",

help="Path to pyproject.toml file")

args = parser.parse_args()

if args.output is None:

args.output = f"requirements-{args.version_type}.txt"

manager = DependencyManager(args.pyproject)

requirements = manager.write_requirements_file(

args.output,

args.version_type,

args.include_optional

)

# Also print to stdout for GitHub Actions

for req in requirements:

print(req)

if __name__ == "__main__":

main()