45 lines
1.6 KiB
Python
45 lines
1.6 KiB
Python
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from __future__ import annotations
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import re
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from pathlib import Path
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from markupsafe import Markup
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from .errors import ToolError
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SPRITE = Path("bootstrap-icons") / "bootstrap-icons.svg"
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SYMBOL = re.compile(r'<symbol class="bi bi-[a-z0-9-]+" viewBox="0 0 16 16" id="([a-z0-9-]+)">(.*?)</symbol>', re.DOTALL)
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NAME = re.compile(r'"#?bi-([a-z0-9]+(?:-[a-z0-9]+)*)"')
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SOURCES = ("*.js", "*.j2")
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def symbols(sprite: Path) -> dict[str, str]:
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return dict(SYMBOL.findall(sprite.read_text(encoding="utf-8")))
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def used(templates: Path) -> list[str]:
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names: set[str] = set()
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for pattern in SOURCES:
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for path in sorted(templates.glob(pattern)):
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names.update(NAME.findall(path.read_text(encoding="utf-8")))
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return sorted(names)
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def sheet(vendor: Path, templates: Path) -> Markup:
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"""Args:
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vendor: the directory holding the vendored Bootstrap Icons sprite.
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templates: the page sources; every string literal "bi-<name>" or
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"#bi-<name>" in them names an icon the page shows.
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Returns:
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A hidden inline SVG holding exactly those symbols, each as
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bi-<name>, so the page draws them with <use href="#bi-<name>"> and
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loads nothing.
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"""
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known = symbols(vendor / SPRITE)
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names = used(templates)
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missing = [name for name in names if name not in known]
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if missing:
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raise ToolError(f"icons missing from {vendor / SPRITE}: {', '.join(missing)}")
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body = "".join(f'<symbol id="bi-{name}" viewBox="0 0 16 16">{known[name]}</symbol>' for name in names)
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return Markup(f'<svg xmlns="http://www.w3.org/2000/svg" class="sprite" aria-hidden="true" focusable="false">{body}</svg>')
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