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| from __future__ import annotations | |
| import json | |
| import textwrap | |
| from collections.abc import Iterable | |
| class FontEncoder(json.JSONEncoder): | |
| def default(self, obj): | |
| if isinstance(obj, Font): | |
| return { | |
| "__gradio_font__": True, | |
| "name": obj.name, | |
| "class": "google" | |
| if isinstance(obj, GoogleFont) | |
| else "local" | |
| if isinstance(obj, LocalFont) | |
| else "font", | |
| "weights": obj.weights | |
| if isinstance(obj, (GoogleFont, LocalFont)) | |
| else None, | |
| } | |
| # Let the base class default method raise the TypeError | |
| return json.JSONEncoder.default(self, obj) | |
| def as_font(dct): | |
| if "__gradio_font__" in dct: | |
| name = dct["name"] | |
| if dct["class"] == "google": | |
| return ( | |
| GoogleFont(name, weights=dct["weights"]) | |
| if "weights" in dct | |
| else GoogleFont(name) | |
| ) | |
| if dct["class"] == "local": | |
| return ( | |
| LocalFont(name, weights=dct["weights"]) | |
| if "weights" in dct | |
| else LocalFont(name) | |
| ) | |
| return Font(name) | |
| return dct | |
| class Font: | |
| def __init__(self, name: str): | |
| self.name = name | |
| def __str__(self) -> str: | |
| return ( | |
| self.name | |
| if self.name in ["sans-serif", "serif", "monospace", "cursive", "fantasy"] | |
| else f"'{self.name}'" | |
| ) | |
| def stylesheet(self) -> dict: | |
| return {"url": None, "css": None} | |
| def __eq__(self, other: Font) -> bool: | |
| return self.name == other.name and self.stylesheet() == other.stylesheet() | |
| def __repr__(self) -> str: | |
| klass = type(self) | |
| class_repr = klass.__module__ + "." + klass.__qualname__ | |
| attrs = ", ".join([k + "=" + repr(v) for k, v in self.__dict__.items()]) | |
| return f"<{class_repr} ({attrs})>" | |
| class GoogleFont(Font): | |
| def __init__(self, name: str, weights: Iterable[int] = (400, 600)): | |
| self.name = name | |
| self.weights = weights | |
| def stylesheet(self) -> dict: | |
| url = f'https://fonts.googleapis.com/css2?family={self.name.replace(" ", "+")}:wght@{";".join(str(weight) for weight in self.weights)}&display=swap' | |
| return {"url": url, "css": None} | |
| class LocalFont(Font): | |
| def __init__(self, name: str, weights: Iterable[int] = (400, 700)): | |
| super().__init__(name) | |
| self.weights = weights | |
| def stylesheet(self) -> dict: | |
| css_template = textwrap.dedent(""" | |
| @font-face {{ | |
| font-family: '{name}'; | |
| src: url('static/fonts/{file_name}/{file_name}-{weight}.woff2') format('woff2'); | |
| font-weight: {weight}; | |
| font-style: normal; | |
| }} | |
| """) | |
| css_rules = [] | |
| for weight in self.weights: | |
| weight_name = ( | |
| "Regular" if weight == 400 else "Bold" if weight == 700 else str(weight) | |
| ) | |
| css_rules.append( | |
| css_template.format( | |
| name=self.name, | |
| file_name=self.name.replace(" ", ""), | |
| weight=weight_name, | |
| ) | |
| ) | |
| return {"url": None, "css": "\n".join(css_rules)} | |