1cd9b4409f
Add `generate_theme_yaml()` that builds a complete theme YAML by loading the professional-clean template CSS, substituting extracted colors and typography, and deriving a dark-mode palette via `derive_darkmode()`. Adds `import yaml`, `import argparse`, `from pathlib import Path`, and module-level constants `TEMPLATE_THEME` / `THEMES_DIR`. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
621 lines
21 KiB
Python
621 lines
21 KiB
Python
"""learn_theme.py — extract a WeWrite-compatible theme from a WeChat article URL.
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Usage:
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python3 scripts/learn_theme.py <url> # fetch + analyse live article
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python3 scripts/learn_theme.py --file <path> # analyse a saved HTML file
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"""
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import argparse
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import colorsys
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import re
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import sys
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from collections import Counter
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from pathlib import Path
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import requests
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import yaml
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from bs4 import BeautifulSoup
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# ---------------------------------------------------------------------------
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# 1. Color utilities
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# ---------------------------------------------------------------------------
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def rgb_to_hex(rgb_str: str) -> str:
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"""Convert ``rgb(r,g,b)`` or ``rgba(r,g,b,a)`` to ``#rrggbb``.
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Pass-through for values that already look like hex (lowercased).
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Return the original string unchanged if no pattern matches.
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"""
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if not isinstance(rgb_str, str):
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return rgb_str
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s = rgb_str.strip()
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# Already hex
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if re.match(r"^#[0-9a-fA-F]{3,8}$", s):
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return s.lower()
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m = re.match(
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r"rgba?\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)(?:\s*,\s*[\d.]+)?\s*\)",
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s,
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re.IGNORECASE,
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)
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if m:
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r, g, b = int(m.group(1)), int(m.group(2)), int(m.group(3))
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return "#{:02x}{:02x}{:02x}".format(r, g, b)
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return s
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def lightness(hex_color: str) -> float:
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"""Return HLS lightness (0.0–1.0) for a hex colour string.
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Returns 0.5 for any invalid / non-hex input.
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"""
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s = hex_color.strip().lstrip("#")
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if len(s) == 3:
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s = "".join(c * 2 for c in s)
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if len(s) != 6:
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return 0.5
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try:
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r = int(s[0:2], 16) / 255.0
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g = int(s[2:4], 16) / 255.0
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b = int(s[4:6], 16) / 255.0
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except ValueError:
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return 0.5
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_h, l, _s = colorsys.rgb_to_hls(r, g, b)
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return l
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def is_gray(hex_color: str, threshold: int = 30) -> bool:
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"""Return True if R, G, B values are all within *threshold* of each other."""
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s = hex_color.strip().lstrip("#")
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if len(s) == 3:
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s = "".join(c * 2 for c in s)
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if len(s) != 6:
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return False
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try:
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r = int(s[0:2], 16)
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g = int(s[2:4], 16)
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b = int(s[4:6], 16)
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except ValueError:
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return False
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return max(r, g, b) - min(r, g, b) <= threshold
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def adjust_lightness(hex_color: str, target_l: float) -> str:
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"""Return a new hex colour with lightness set to *target_l* (0.0–1.0)."""
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s = hex_color.strip().lstrip("#")
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if len(s) == 3:
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s = "".join(c * 2 for c in s)
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if len(s) != 6:
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return hex_color
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try:
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r = int(s[0:2], 16) / 255.0
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g = int(s[2:4], 16) / 255.0
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b = int(s[4:6], 16) / 255.0
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except ValueError:
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return hex_color
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h, _l, sat = colorsys.rgb_to_hls(r, g, b)
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nr, ng, nb = colorsys.hls_to_rgb(h, max(0.0, min(1.0, target_l)), sat)
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return "#{:02x}{:02x}{:02x}".format(
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int(nr * 255), int(ng * 255), int(nb * 255)
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)
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def derive_darkmode(colors: dict) -> dict:
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"""Derive a dark-mode colour dict from a light-mode *colors* dict.
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Rules
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-----
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background → #1e1e1e
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text → lightness set to 0.80
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text_light → lightness set to 0.60
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primary → lightness + 0.15, capped at 0.85
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code_bg → #2d2d2d
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code_color → #d4d4d4
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quote_bg → #252525
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quote_border → dark-mode primary
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"""
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primary = colors.get("primary", "#2563eb")
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primary_l = lightness(primary)
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dm_primary = adjust_lightness(primary, min(primary_l + 0.15, 0.85))
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dm = {
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"background": "#1e1e1e",
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"text": adjust_lightness(colors.get("text", "#333333"), 0.80),
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"text_light": adjust_lightness(colors.get("text_light", "#666666"), 0.60),
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"primary": dm_primary,
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"code_bg": "#2d2d2d",
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"code_color": "#d4d4d4",
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"quote_bg": "#252525",
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"quote_border": dm_primary,
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}
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return dm
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# ---------------------------------------------------------------------------
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# 2. HTML fetch and style extraction
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# ---------------------------------------------------------------------------
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def parse_inline_style(style_str: str) -> dict:
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"""Parse ``"color: red; font-size: 16px"`` into ``{"color": "red", "font-size": "16px"}``."""
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result = {}
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if not style_str:
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return result
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for declaration in style_str.split(";"):
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declaration = declaration.strip()
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if ":" not in declaration:
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continue
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prop, _, val = declaration.partition(":")
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result[prop.strip().lower()] = val.strip()
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return result
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_TARGET_TAGS = {
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"p", "section", "span", "strong", "em",
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"h1", "h2", "h3", "h4",
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"blockquote", "code", "pre", "img", "a",
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}
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_BROWSER_UA = (
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"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) "
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"AppleWebKit/537.36 (KHTML, like Gecko) "
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"Chrome/124.0.0.0 Safari/537.36"
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)
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TEMPLATE_THEME = "professional-clean"
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THEMES_DIR = Path(__file__).resolve().parent.parent / "toolkit" / "themes"
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def _attach_title(soup, content) -> None:
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"""Find the article title in *soup* and stash it on *content*."""
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title_tag = soup.find("h1", class_="rich_media_title") or soup.find(
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"h1", id="activity-name"
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)
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content._wewrite_title = title_tag.get_text(strip=True) if title_tag else ""
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def fetch_article(url: str, timeout: int = 20) -> "BeautifulSoup tag":
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"""Fetch a WeChat article, return the ``#js_content`` element.
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The article title is attached as ``content._wewrite_title`` (empty string
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if not found). Exits with code 1 on network errors or missing content.
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Parameters
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----------
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url: WeChat article URL (mp.weixin.qq.com/…)
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timeout: HTTP request timeout in seconds (default 20).
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"""
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try:
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resp = requests.get(url, headers={"User-Agent": _BROWSER_UA}, timeout=timeout)
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resp.raise_for_status()
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except requests.exceptions.RequestException as exc:
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print(f"Error: failed to fetch URL: {exc}", file=sys.stderr)
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sys.exit(1)
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resp.encoding = "utf-8"
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soup = BeautifulSoup(resp.text, "html.parser")
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content = soup.find(id="js_content")
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if content is None:
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print("Error: #js_content not found — the page may require verification.", file=sys.stderr)
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sys.exit(1)
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_attach_title(soup, content)
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return content
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def extract_styles(content) -> dict:
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"""Iterate all elements in *content*, group inline styles by tag name.
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Returns ``{tag_name: [style_dict, ...], ...}`` for the target tags.
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Only elements that have a non-empty ``style`` attribute are included.
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"""
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grouped: dict[str, list[dict]] = {tag: [] for tag in _TARGET_TAGS}
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for elem in content.find_all(True):
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tag = elem.name
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if tag not in _TARGET_TAGS:
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continue
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raw_style = elem.get("style", "")
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if not raw_style:
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continue
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parsed = parse_inline_style(raw_style)
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if parsed:
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grouped[tag].append(parsed)
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return grouped
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# ---------------------------------------------------------------------------
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# 3. Style analysis
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# ---------------------------------------------------------------------------
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DEFAULTS = {
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"primary": "#2563eb",
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"secondary": "#3b82f6",
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"text": "#333333",
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"text_light": "#666666",
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"background": "#ffffff",
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"code_bg": "#1e293b",
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"code_color": "#e2e8f0",
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"quote_border": "#2563eb",
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"quote_bg": "#eff6ff",
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"border_radius": "8px",
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"font_size": "16px",
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"line_height": "1.8",
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"letter_spacing": "0px",
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"font_family": (
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'-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, '
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'"Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", '
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'"Microsoft YaHei", sans-serif'
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),
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"p_margin": "0 0 16px 0",
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}
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def most_common_value(style_list: list, prop: str):
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"""Return the most common value of CSS *prop* across *style_list*.
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Returns ``None`` if the property does not appear in any dict.
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"""
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values = [d[prop] for d in style_list if prop in d and d[prop]]
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if not values:
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return None
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return Counter(values).most_common(1)[0][0]
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def _parse_px(value: str) -> float | None:
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"""Parse a CSS pixel value like ``"16px"`` → 16.0, or return None."""
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if not value:
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return None
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m = re.match(r"([\d.]+)\s*px", value.strip(), re.IGNORECASE)
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return float(m.group(1)) if m else None
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def analyze_styles(grouped: dict) -> dict:
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"""Analyse the output of :func:`extract_styles` and return a flat theme dict.
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Inferred properties (falling back to DEFAULTS when not found):
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text, text_light, primary, secondary, background,
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font_size, line_height, letter_spacing, font_family, p_margin,
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quote_border, quote_bg, code_bg, code_color, border_radius.
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"""
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result = dict(DEFAULTS) # start with all defaults
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# --- text ------------------------------------------------------------------
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p_styles = grouped.get("p", [])
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raw_text = most_common_value(p_styles, "color")
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if raw_text:
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result["text"] = rgb_to_hex(raw_text)
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# --- text_light ------------------------------------------------------------
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# Collect foreground colours only (not backgrounds) for text_light candidates
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all_colors = []
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for tag_styles in grouped.values():
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for d in tag_styles:
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val = d.get("color")
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if val:
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all_colors.append(rgb_to_hex(val))
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text_light_candidates = [
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c for c in all_colors
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if is_gray(c) and 0.15 < lightness(c) < 0.85 and c != result["text"]
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]
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if text_light_candidates:
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# Pick the one with the highest lightness
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result["text_light"] = max(text_light_candidates, key=lightness)
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# --- primary (accent color) ------------------------------------------------
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# Collect non-gray colors from strong/section/h1-h3/span; boost colors from
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# elements whose font-size is ≥ 20 px (weight × 5).
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# Exclude the dominant text color so near-black body text never wins.
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accent_tags = {"strong", "section", "h1", "h2", "h3", "span"}
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accent_counter: Counter = Counter()
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for tag in accent_tags:
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for d in grouped.get(tag, []):
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color_val = d.get("color")
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if not color_val:
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continue
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hex_c = rgb_to_hex(color_val)
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if is_gray(hex_c):
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continue
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if hex_c == result["text"]:
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continue
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# Check font-size for boost
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fs = d.get("font-size")
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fs_px = _parse_px(fs) if fs else None
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weight = 5 if (fs_px is not None and fs_px >= 20) else 1
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accent_counter[hex_c] += weight
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if accent_counter:
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sorted_accents = accent_counter.most_common()
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result["primary"] = sorted_accents[0][0]
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# --- secondary ---------------------------------------------------------
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if len(sorted_accents) >= 2:
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result["secondary"] = sorted_accents[1][0]
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else:
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# Derive: primary + 10% lightness, cap 0.90
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primary_l = lightness(result["primary"])
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result["secondary"] = adjust_lightness(
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result["primary"], min(primary_l + 0.10, 0.90)
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)
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else:
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# No accent found — derive secondary from default primary
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primary_l = lightness(result["primary"])
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result["secondary"] = adjust_lightness(
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result["primary"], min(primary_l + 0.10, 0.90)
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)
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# --- background ------------------------------------------------------------
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# Check background-color of the first few <section> elements for high lightness
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for d in (grouped.get("section", []))[:10]:
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bg = d.get("background-color") or d.get("background")
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if bg:
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hex_bg = rgb_to_hex(bg)
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if lightness(hex_bg) > 0.85:
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result["background"] = hex_bg
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break
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# --- typography (from <p>) -------------------------------------------------
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if p_styles:
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fs = most_common_value(p_styles, "font-size")
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if fs:
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result["font_size"] = fs
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lh = most_common_value(p_styles, "line-height")
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if lh:
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result["line_height"] = lh
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ls = most_common_value(p_styles, "letter-spacing")
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if ls:
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result["letter_spacing"] = ls
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margin = most_common_value(p_styles, "margin")
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if margin:
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result["p_margin"] = margin
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# font-family from <span>
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span_styles = grouped.get("span", [])
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ff = most_common_value(span_styles, "font-family")
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if ff:
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result["font_family"] = ff
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# --- quote_border / quote_bg -----------------------------------------------
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# Priority: actual <blockquote> elements first.
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# For section/p: only use a background when a border-left is also present on
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# that element (avoids picking up decorative divider colors).
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bq_border = None
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bq_bg = None
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# Pass 1: blockquote (highest confidence)
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for d in grouped.get("blockquote", []):
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bl = d.get("border-left") or d.get("border-left-color")
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if bl and not bq_border:
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color_match = re.search(r"(rgb[a]?\([^)]+\)|#[0-9a-fA-F]{3,8})", bl)
|
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if color_match:
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bq_border = rgb_to_hex(color_match.group(1))
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bg = d.get("background-color") or d.get("background")
|
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if bg and not bq_bg:
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hex_bg = rgb_to_hex(bg)
|
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if hex_bg not in ("#ffffff", "#000000") and not is_gray(hex_bg, threshold=10):
|
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bq_bg = hex_bg
|
||
|
||
# Pass 2: section/p — only trust backgrounds that co-occur with border-left
|
||
if not bq_border:
|
||
for tag in ("section", "p"):
|
||
for d in grouped.get(tag, []):
|
||
bl = d.get("border-left") or d.get("border-left-color")
|
||
if bl:
|
||
color_match = re.search(r"(rgb[a]?\([^)]+\)|#[0-9a-fA-F]{3,8})", bl)
|
||
if color_match and not bq_border:
|
||
bq_border = rgb_to_hex(color_match.group(1))
|
||
bg = d.get("background-color") or d.get("background")
|
||
if bg and not bq_bg:
|
||
hex_bg = rgb_to_hex(bg)
|
||
if hex_bg not in ("#ffffff", "#000000") and not is_gray(
|
||
hex_bg, threshold=10
|
||
):
|
||
bq_bg = hex_bg
|
||
|
||
if bq_border:
|
||
result["quote_border"] = bq_border
|
||
else:
|
||
result["quote_border"] = result["primary"]
|
||
|
||
if bq_bg:
|
||
result["quote_bg"] = bq_bg
|
||
else:
|
||
# Derive a light tint of primary
|
||
primary_l = lightness(result["primary"])
|
||
result["quote_bg"] = adjust_lightness(result["primary"], min(primary_l + 0.35, 0.95))
|
||
|
||
# --- code_bg / code_color --------------------------------------------------
|
||
for tag in ("pre", "code"):
|
||
tag_styles = grouped.get(tag, [])
|
||
bg = most_common_value(tag_styles, "background-color") or most_common_value(
|
||
tag_styles, "background"
|
||
)
|
||
if bg:
|
||
result["code_bg"] = rgb_to_hex(bg)
|
||
color = most_common_value(tag_styles, "color")
|
||
if color:
|
||
result["code_color"] = rgb_to_hex(color)
|
||
|
||
# --- border_radius ---------------------------------------------------------
|
||
all_radii = []
|
||
for tag_styles in grouped.values():
|
||
for d in tag_styles:
|
||
br = d.get("border-radius")
|
||
if br:
|
||
all_radii.append(br)
|
||
if all_radii:
|
||
result["border_radius"] = Counter(all_radii).most_common(1)[0][0]
|
||
|
||
return result
|
||
|
||
|
||
# ---------------------------------------------------------------------------
|
||
# 4. Theme YAML generation
|
||
# ---------------------------------------------------------------------------
|
||
|
||
def _load_template_css() -> str:
|
||
"""Load the base_css from the professional-clean template theme."""
|
||
template_path = THEMES_DIR / f"{TEMPLATE_THEME}.yaml"
|
||
with open(template_path, encoding="utf-8") as fh:
|
||
data = yaml.safe_load(fh)
|
||
return data["base_css"]
|
||
|
||
|
||
def generate_theme_yaml(name: str, title: str, analyzed: dict) -> str:
|
||
"""Generate a complete theme YAML string from analyzed style properties.
|
||
|
||
Parameters
|
||
----------
|
||
name: Theme identifier (used as filename and --theme reference).
|
||
title: Article title (used in description).
|
||
analyzed: Dict returned by :func:`analyze_styles`.
|
||
"""
|
||
css = _load_template_css()
|
||
|
||
# Build colors dict
|
||
colors = {
|
||
"primary": analyzed.get("primary", "#2563eb"),
|
||
"secondary": analyzed.get("secondary", "#3b82f6"),
|
||
"text": analyzed.get("text", "#333333"),
|
||
"text_light": analyzed.get("text_light", "#666666"),
|
||
"background": analyzed.get("background", "#ffffff"),
|
||
"code_bg": analyzed.get("code_bg", "#1e293b"),
|
||
"code_color": analyzed.get("code_color", "#e2e8f0"),
|
||
"quote_border": analyzed.get("quote_border", "#2563eb"),
|
||
"quote_bg": analyzed.get("quote_bg", "#eff6ff"),
|
||
"border_radius": analyzed.get("border_radius", "8px"),
|
||
}
|
||
|
||
# Replace template colors in CSS
|
||
css = css.replace("#2563eb", colors["primary"])
|
||
css = css.replace("#3b82f6", colors["secondary"])
|
||
css = css.replace("#333333", colors["text"])
|
||
css = css.replace("#666666", colors["text_light"])
|
||
css = css.replace("#1e293b", colors["code_bg"])
|
||
css = css.replace("#e2e8f0", colors["code_color"])
|
||
css = css.replace("#eff6ff", colors["quote_bg"])
|
||
|
||
# Replace typography via regex
|
||
font_size = analyzed.get("font_size", "16px")
|
||
line_height = analyzed.get("line_height", "1.8")
|
||
font_family = analyzed.get("font_family",
|
||
'-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, '
|
||
'"Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", '
|
||
'"Microsoft YaHei", sans-serif')
|
||
p_margin = analyzed.get("p_margin", "12px 0")
|
||
border_radius = colors["border_radius"]
|
||
|
||
# body font-size
|
||
css = re.sub(
|
||
r"(body\s*\{[^}]*font-size:\s*)[\d.]+px",
|
||
lambda m: m.group(1) + font_size,
|
||
css,
|
||
flags=re.DOTALL,
|
||
)
|
||
# body line-height
|
||
css = re.sub(
|
||
r"(body\s*\{[^}]*line-height:\s*)[\d.]+",
|
||
lambda m: m.group(1) + line_height,
|
||
css,
|
||
flags=re.DOTALL,
|
||
)
|
||
# body font-family (replace the quoted chain)
|
||
css = re.sub(
|
||
r'(body\s*\{[^}]*font-family:\s*)[^;]+;',
|
||
lambda m: m.group(1) + font_family + ";",
|
||
css,
|
||
flags=re.DOTALL,
|
||
)
|
||
# p line-height
|
||
css = re.sub(
|
||
r'(p\s*\{[^}]*line-height:\s*)[\d.]+',
|
||
lambda m: m.group(1) + line_height,
|
||
css,
|
||
flags=re.DOTALL,
|
||
)
|
||
# p margin
|
||
css = re.sub(
|
||
r'(p\s*\{[^}]*margin:\s*)[^;]+;',
|
||
lambda m: m.group(1) + p_margin + ";",
|
||
css,
|
||
flags=re.DOTALL,
|
||
)
|
||
# li line-height (match p line-height)
|
||
css = re.sub(
|
||
r'(li\s*\{[^}]*line-height:\s*)[\d.]+',
|
||
lambda m: m.group(1) + line_height,
|
||
css,
|
||
flags=re.DOTALL,
|
||
)
|
||
# border-radius: 8px and border-radius: 4px
|
||
css = css.replace("border-radius: 8px", f"border-radius: {border_radius}")
|
||
css = css.replace("border-radius: 4px", f"border-radius: {border_radius}")
|
||
|
||
# Derive dark mode
|
||
darkmode = derive_darkmode(colors)
|
||
|
||
# Description
|
||
if title:
|
||
description = f"从「{title}」学习的排版主题"
|
||
else:
|
||
description = f"Learned theme: {name}"
|
||
|
||
# Build theme data
|
||
colors_with_dark = dict(colors)
|
||
colors_with_dark["darkmode"] = darkmode
|
||
|
||
theme_data = {
|
||
"name": name,
|
||
"description": description,
|
||
"colors": colors_with_dark,
|
||
"base_css": css,
|
||
}
|
||
|
||
return yaml.dump(theme_data, allow_unicode=True, default_flow_style=False, sort_keys=False)
|
||
|
||
|
||
# ---------------------------------------------------------------------------
|
||
# CLI entry point / smoke test
|
||
# ---------------------------------------------------------------------------
|
||
|
||
def _load_from_file(path: str):
|
||
"""Load #js_content from a local HTML file (for smoke testing)."""
|
||
with open(path, encoding="utf-8") as fh:
|
||
soup = BeautifulSoup(fh.read(), "html.parser")
|
||
content = soup.find(id="js_content")
|
||
if content is None:
|
||
print(f"Error: #js_content not found in {path}", file=sys.stderr)
|
||
sys.exit(1)
|
||
_attach_title(soup, content)
|
||
return content
|
||
|
||
|
||
def main():
|
||
args = sys.argv[1:]
|
||
if not args:
|
||
print(__doc__)
|
||
sys.exit(0)
|
||
|
||
if args[0] == "--file" and len(args) >= 2:
|
||
content = _load_from_file(args[1])
|
||
else:
|
||
content = fetch_article(args[0])
|
||
|
||
print(f"Title: {content._wewrite_title}")
|
||
grouped = extract_styles(content)
|
||
print("Elements with styles:")
|
||
for tag, styles in grouped.items():
|
||
if styles:
|
||
print(f" <{tag}>: {len(styles)} elements")
|
||
|
||
theme = analyze_styles(grouped)
|
||
print("\nInferred theme:")
|
||
for key, val in theme.items():
|
||
print(f" {key}: {val}")
|
||
|
||
# Dark mode
|
||
dm = derive_darkmode(theme)
|
||
print("\nDerived dark mode:")
|
||
for key, val in dm.items():
|
||
print(f" {key}: {val}")
|
||
|
||
|
||
if __name__ == "__main__":
|
||
main()
|