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generator.py
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generator.py
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import re
import subprocess
from pathlib import Path
from textwrap import indent
from typing import Iterator, List, Optional
from jinja2 import Environment, FileSystemLoader
from xsdata.codegen.exceptions import CodegenError
from xsdata.codegen.models import Class, Import
from xsdata.codegen.resolver import DependenciesResolver
from xsdata.formats.dataclass.filters import Filters
from xsdata.formats.mixins import AbstractGenerator, GeneratorResult
from xsdata.models.config import GeneratorConfig
class DataclassGenerator(AbstractGenerator):
"""Python dataclasses code generator.
Args:
config: The generator config instance
Attributes:
env: The jinja2 environment instance
filters: The template filters instance
"""
__slots__ = ("env", "filters", "ruff_config")
package_template = "package.jinja2"
module_template = "module.jinja2"
enum_template = "enum.jinja2"
service_template = "service.jinja2"
class_template = "class.jinja2"
def __init__(self, config: GeneratorConfig):
super().__init__(config)
template_paths = self.get_template_paths()
loader = FileSystemLoader(template_paths)
self.env = Environment(loader=loader, autoescape=False)
self.filters = self.init_filters(config)
self.filters.register(self.env)
self.ruff_config = Path(__file__).parent / "ruff.toml"
@classmethod
def get_template_paths(cls) -> List[str]:
"""Return a list of template paths to feed the jinja2 loader."""
return [str(Path(__file__).parent.joinpath("templates"))]
def render(self, classes: List[Class]) -> Iterator[GeneratorResult]:
"""Render the given classes to python packages and modules.
Args:
classes: A list of class instances
Yields:
An iterator of generator result instances.
"""
packages = {obj.qname: obj.target_module for obj in classes}
resolver = DependenciesResolver(registry=packages)
# Generate packages
for path, cluster in self.group_by_package(classes).items():
module = ".".join(path.relative_to(Path.cwd()).parts)
package_path = path.joinpath("__init__.py")
src_code = self.render_package(cluster, module, package_path)
yield GeneratorResult(
path=package_path,
title="init",
source=src_code,
)
yield from self.ensure_packages(path.parent)
# Generate modules
for path, cluster in self.group_by_module(classes).items():
module_path = path.with_suffix(".py")
src_code = self.render_module(resolver, cluster, module_path)
yield GeneratorResult(
path=module_path,
title=cluster[0].target_module,
source=src_code,
)
def render_package(self, classes: List[Class], module: str, filename: Path) -> str:
"""Render the package for the given classes.
Args:
classes: A list of class instances
module: The target dot notation path
filename: The package path
Returns:
The rendered package output.
"""
imports = [
Import(qname=obj.qname, source=obj.target_module)
for obj in sorted(classes, key=lambda x: x.name)
]
DependenciesResolver.resolve_conflicts(imports, set())
output = self.env.get_template(self.package_template).render(
imports=imports,
module=module,
)
return self.ruff_code(output, filename)
def render_module(
self,
resolver: DependenciesResolver,
classes: List[Class],
filename: Path,
) -> str:
"""Render the module for the given classes.
Args:
resolver: The dependencies resolver
classes: A list of class instances
filename: The module path
Returns:
The rendered module output.
"""
if len({x.target_namespace for x in classes}) == 1:
module_namespace = classes[0].target_namespace
else:
module_namespace = None
resolver.process(classes)
imports = resolver.sorted_imports()
classes = resolver.sorted_classes()
output = self.render_classes(classes, module_namespace)
module = classes[0].target_module
result = self.env.get_template(self.module_template).render(
output=output,
classes=classes,
module=module,
imports=imports,
namespace=module_namespace,
)
return self.ruff_code(result, filename)
def render_classes(
self,
classes: List[Class],
module_namespace: Optional[str],
) -> str:
"""Render the classes source code in a module.
Args:
classes: A list of class instances
module_namespace: The module namespace URI
Returns:
The rendered classes source code output.
"""
def render_class(obj: Class) -> str:
"""Render class or enumeration."""
if obj.is_enumeration:
template = self.enum_template
elif obj.is_service:
template = self.service_template
else:
template = self.class_template
return (
self.env.get_template(template)
.render(
obj=obj,
module_namespace=module_namespace,
)
.strip()
)
return "\n".join(map(render_class, classes))
def module_name(self, name: str) -> str:
"""Convert the given module name to safe snake case."""
return self.filters.module_name(name)
def package_name(self, name: str) -> str:
"""Convert the given package name to safe snake case."""
return self.filters.package_name(name)
@classmethod
def ensure_packages(cls, package: Path) -> Iterator[GeneratorResult]:
"""Ensure __init__.py files exists recursively in the package.
Args:
package: The package file path
Yields:
An iterator of generator result instances.
"""
cwd = Path.cwd()
while cwd < package:
init = package.joinpath("__init__.py")
if not init.exists():
yield GeneratorResult(
path=init, title="init", source="# nothing here\n"
)
package = package.parent
@classmethod
def init_filters(cls, config: GeneratorConfig) -> Filters:
"""Initialize the filters instance by the generator configuration."""
return Filters(config)
def ruff_code(self, src_code: str, file_path: Path) -> str:
"""Run ruff format on the src code.
Args:
src_code: The output source code
file_path: The file path the source code will be written to
Returns:
The formatted output source code
"""
commands = [
[
"ruff",
"format",
"--stdin-filename",
str(file_path),
"--line-length",
str(self.config.output.max_line_length),
],
[
"ruff",
"checks",
"--stdin-filename",
str(file_path),
"--line-length",
str(self.config.output.max_line_length),
"--config",
str(self.ruff_config),
"--fix",
"--unsafe-fixes",
"--exit-zero",
],
]
try:
src_code_encoded = src_code.encode()
for command in commands:
result = subprocess.run(
command,
input=src_code_encoded,
capture_output=True,
check=True,
)
src_code_encoded = result.stdout
return src_code_encoded.decode()
except subprocess.CalledProcessError as e:
details = e.stderr.decode().replace("error: ", "").strip()
source = self.code_excerpt(details, src_code_encoded.decode())
raise CodegenError("Ruff failed", details=details, source=source)
@classmethod
def code_excerpt(cls, details: str, src_code: str) -> str:
"""Extract source code excerpt from the error details message."""
match = re.search(r"(\d+):(\d+)", details)
if match:
line_number = int(match.group(1)) - 1
lines = src_code.split("\n")
start = max(0, line_number - 4)
end = min(len(lines), line_number + 4)
excerpt = ["\n"]
for index in range(start, end):
prepend = "--->" if index == line_number else " "
excerpt.append(f"{prepend}{lines[index]}")
return "\n".join(excerpt)
return "NA"