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Tests can be run with ``` bazel test //swift/codegen:tests ``` Coverage can be checked installing `pytest-cov` and running ``` pytest --cov=swift/codegen swift/codegen/test ```
45 lines
1.4 KiB
Python
45 lines
1.4 KiB
Python
""" template renderer module, wrapping around `pystache.Renderer`
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`pystache` is a python mustache engine, and mustache is a template language. More information on
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https://mustache.github.io/
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"""
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import logging
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import pathlib
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import pystache
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from . import paths
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log = logging.getLogger(__name__)
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class Renderer:
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""" Template renderer using mustache templates in the `templates` directory """
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def __init__(self):
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self._r = pystache.Renderer(search_dirs=str(paths.lib_dir / "templates"), escape=lambda u: u)
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self.written = set()
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def render(self, data, output: pathlib.Path):
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""" Render `data` to `output`.
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`data` must have a `template` attribute denoting which template to use from the template directory.
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If the file is unchanged, then no write is performed (and `done_something` remains unchanged)
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"""
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mnemonic = type(data).__name__
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output.parent.mkdir(parents=True, exist_ok=True)
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data = self._r.render_name(data.template, data, generator=paths.exe_file)
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with open(output, "w") as out:
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out.write(data)
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log.debug(f"generated {mnemonic} {output.name}")
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self.written.add(output)
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def cleanup(self, existing):
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""" Remove files in `existing` for which no `render` has been called """
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for f in existing - self.written:
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f.unlink(missing_ok=True)
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log.info(f"removed {f.name}")
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