mirror of
https://github.com/squidfunk/mkdocs-material.git
synced 2024-12-21 11:56:03 +01:00
580 lines
19 KiB
Python
580 lines
19 KiB
Python
# Copyright (c) 2016-2024 Martin Donath <martin.donath@squidfunk.com>
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to
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# deal in the Software without restriction, including without limitation the
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# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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# sell copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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# IN THE SOFTWARE.
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import json
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import logging
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import os
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import regex as re
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from html import escape
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from html.parser import HTMLParser
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from mkdocs import utils
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from mkdocs.plugins import BasePlugin
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from .config import SearchConfig
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try:
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import jieba
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except ImportError:
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jieba = None
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# -----------------------------------------------------------------------------
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# Classes
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# -----------------------------------------------------------------------------
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# Search plugin
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class SearchPlugin(BasePlugin[SearchConfig]):
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# Initialize plugin
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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# Initialize incremental builds
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self.is_dirty = False
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self.is_dirtyreload = False
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# Initialize search index cache
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self.search_index_prev = None
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# Determine whether we're serving the site
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def on_startup(self, *, command, dirty):
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self.is_dirty = dirty
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# Initialize plugin
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def on_config(self, config):
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if not self.config.enabled:
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return
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# Retrieve default value for language
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if not self.config.lang:
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self.config.lang = [self._translate(
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config, "search.config.lang"
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)]
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# Retrieve default value for separator
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if not self.config.separator:
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self.config.separator = self._translate(
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config, "search.config.separator"
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)
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# Retrieve default value for pipeline
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if self.config.pipeline is None:
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self.config.pipeline = list(filter(len, re.split(
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r"\s*,\s*", self._translate(config, "search.config.pipeline")
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)))
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# Initialize search index
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self.search_index = SearchIndex(**self.config)
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# Set jieba dictionary, if given
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if self.config.jieba_dict:
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path = os.path.normpath(self.config.jieba_dict)
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if os.path.isfile(path):
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jieba.set_dictionary(path)
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log.debug(f"Loading jieba dictionary: {path}")
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else:
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log.warning(
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f"Configuration error for 'search.jieba_dict': "
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f"'{self.config.jieba_dict}' does not exist."
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)
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# Set jieba user dictionary, if given
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if self.config.jieba_dict_user:
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path = os.path.normpath(self.config.jieba_dict_user)
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if os.path.isfile(path):
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jieba.load_userdict(path)
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log.debug(f"Loading jieba user dictionary: {path}")
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else:
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log.warning(
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f"Configuration error for 'search.jieba_dict_user': "
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f"'{self.config.jieba_dict_user}' does not exist."
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)
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# Add page to search index
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def on_page_context(self, context, *, page, config, nav):
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if not self.config.enabled:
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return
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# Index page
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self.search_index.add_entry_from_context(page)
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page.content = re.sub(
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r"\s?data-search-\w+=\"[^\"]+\"",
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"",
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page.content
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)
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# Generate search index
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def on_post_build(self, *, config):
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if not self.config.enabled:
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return
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# Write search index
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base = os.path.join(config.site_dir, "search")
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path = os.path.join(base, "search_index.json")
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# Generate and write search index to file
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data = self.search_index.generate_search_index(self.search_index_prev)
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utils.write_file(data.encode("utf-8"), path)
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# Persist search index for repeated invocation
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if self.is_dirty:
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self.search_index_prev = self.search_index
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# Determine whether we're running under dirty reload
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def on_serve(self, server, *, config, builder):
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self.is_dirtyreload = self.is_dirty
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# -------------------------------------------------------------------------
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# Translate the given placeholder value
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def _translate(self, config, value):
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env = config.theme.get_env()
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# Load language template and return translation for placeholder
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language = "partials/language.html"
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template = env.get_template(language, None, { "config": config })
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return template.module.t(value)
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# -----------------------------------------------------------------------------
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# Search index with support for additional fields
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class SearchIndex:
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# Initialize search index
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def __init__(self, **config):
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self.config = config
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self.entries = []
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# Add page to search index
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def add_entry_from_context(self, page):
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search = page.meta.get("search") or {}
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if search.get("exclude"):
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return
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# Divide page content into sections
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parser = Parser()
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parser.feed(page.content)
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parser.close()
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# Add sections to index
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for section in parser.data:
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if not section.is_excluded():
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self.create_entry_for_section(section, page.toc, page.url, page)
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# Override: graceful indexing and additional fields
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def create_entry_for_section(self, section, toc, url, page):
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item = self._find_toc_by_id(toc, section.id)
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if item:
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url = url + item.url
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elif section.id:
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url = url + "#" + section.id
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# Set page title as section title if none was given, which happens when
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# the first headline in a Markdown document is not a h1 headline. Also,
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# if a page title was set via front matter, use that even though a h1
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# might be given or the page name was specified in nav in mkdocs.yml
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if not section.title:
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section.title = [str(page.meta.get("title", page.title))]
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# Compute title and text
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title = "".join(section.title).strip()
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text = "".join(section.text).strip()
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# Segment Chinese characters if jieba is available
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if jieba:
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title = self._segment_chinese(title)
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text = self._segment_chinese(text)
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# Create entry for section
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entry = {
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"location": url,
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"title": title,
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"text": text
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}
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# Set document tags
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tags = page.meta.get("tags")
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if isinstance(tags, list):
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entry["tags"] = []
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for name in tags:
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if name and isinstance(name, (str, int, float, bool)):
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entry["tags"].append(name)
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# Set document boost
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search = page.meta.get("search") or {}
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if "boost" in search:
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entry["boost"] = search["boost"]
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# Add entry to index
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self.entries.append(entry)
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# Generate search index
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def generate_search_index(self, prev):
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config = {
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key: self.config[key]
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for key in ["lang", "separator", "pipeline"]
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}
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# Hack: if we're running under dirty reload, the search index will only
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# include the entries for the current page. However, MkDocs > 1.4 allows
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# us to persist plugin state across rebuilds, which is exactly what we
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# do by passing the previously built index to this method. Thus, we just
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# remove the previous entries for the current page, and append the new
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# entries to the end of the index, as order doesn't matter.
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if prev and self.entries:
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path = self.entries[0]["location"]
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# Since we're sure that we're running under dirty reload, the list
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# of entries will only contain sections for a single page. Thus, we
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# use the first entry to remove all entries from the previous run
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# that belong to the current page. The rationale behind this is that
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# authors might add or remove section headers, so we need to make
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# sure that sections are synchronized correctly.
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entries = [
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entry for entry in prev.entries
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if not entry["location"].startswith(path)
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]
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# Merge previous with current entries
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self.entries = entries + self.entries
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# Otherwise just set previous entries
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if prev and not self.entries:
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self.entries = prev.entries
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# Return search index as JSON
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data = { "config": config, "docs": self.entries }
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return json.dumps(
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data,
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separators = (",", ":"),
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default = str
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)
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# -------------------------------------------------------------------------
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# Retrieve item for anchor
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def _find_toc_by_id(self, toc, id):
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for toc_item in toc:
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if toc_item.id == id:
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return toc_item
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# Recurse into children of item
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toc_item = self._find_toc_by_id(toc_item.children, id)
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if toc_item is not None:
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return toc_item
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# No item found
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return None
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# Find and segment Chinese characters in string
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def _segment_chinese(self, data):
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expr = re.compile(r"(\p{IsHan}+)", re.UNICODE)
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# Replace callback
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def replace(match):
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value = match.group(0)
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# Replace occurrence in original string with segmented version and
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# surround with zero-width whitespace for efficient indexing
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return "".join([
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"\u200b",
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"\u200b".join(jieba.cut(value.encode("utf-8"))),
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"\u200b",
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])
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# Return string with segmented occurrences
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return expr.sub(replace, data).strip("\u200b")
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# -----------------------------------------------------------------------------
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# HTML element
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class Element:
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"""
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An element with attributes, essentially a small wrapper object for the
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parser to access attributes in other callbacks than handle_starttag.
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"""
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# Initialize HTML element
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def __init__(self, tag, attrs = None):
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self.tag = tag
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self.attrs = attrs or {}
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# String representation
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def __repr__(self):
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return self.tag
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# Support comparison (compare by tag only)
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def __eq__(self, other):
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if other is Element:
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return self.tag == other.tag
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else:
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return self.tag == other
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# Support set operations
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def __hash__(self):
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return hash(self.tag)
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# Check whether the element should be excluded
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def is_excluded(self):
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return "data-search-exclude" in self.attrs
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# -----------------------------------------------------------------------------
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# HTML section
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class Section:
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"""
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A block of text with markup, preceded by a title (with markup), i.e., a
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headline with a certain level (h1-h6). Internally used by the parser.
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"""
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# Initialize HTML section
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def __init__(self, el, depth = 0):
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self.el = el
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self.depth = depth
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# Initialize section data
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self.text = []
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self.title = []
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self.id = None
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# String representation
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def __repr__(self):
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if self.id:
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return "#".join([self.el.tag, self.id])
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else:
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return self.el.tag
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# Check whether the section should be excluded
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def is_excluded(self):
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return self.el.is_excluded()
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# -----------------------------------------------------------------------------
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# HTML parser
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class Parser(HTMLParser):
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"""
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This parser divides the given string of HTML into a list of sections, each
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of which are preceded by a h1-h6 level heading. A white- and blacklist of
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tags dictates which tags should be preserved as part of the index, and
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which should be ignored in their entirety.
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"""
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# Initialize HTML parser
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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# Tags to skip
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self.skip = set([
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"object", # Objects
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"script", # Scripts
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"style" # Styles
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])
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# Tags to keep
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self.keep = set([
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"p", # Paragraphs
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"code", "pre", # Code blocks
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"li", "ol", "ul", # Lists
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"sub", "sup" # Sub- and superscripts
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])
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# Current context and section
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self.context = []
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self.section = None
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# All parsed sections
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self.data = []
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# Called at the start of every HTML tag
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def handle_starttag(self, tag, attrs):
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attrs = dict(attrs)
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# Ignore self-closing tags
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el = Element(tag, attrs)
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if not tag in void:
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self.context.append(el)
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else:
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return
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# Handle heading
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if tag in ([f"h{x}" for x in range(1, 7)]):
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depth = len(self.context)
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if "id" in attrs:
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# Ensure top-level section
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if tag != "h1" and not self.data:
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self.section = Section(Element("hx"), depth)
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self.data.append(self.section)
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# Set identifier, if not first section
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self.section = Section(el, depth)
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if self.data:
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self.section.id = attrs["id"]
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# Append section to list
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self.data.append(self.section)
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# Handle preface - ensure top-level section
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if not self.section:
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self.section = Section(Element("hx"))
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self.data.append(self.section)
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# Handle special cases to skip
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for key, value in attrs.items():
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# Skip block if explicitly excluded from search
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if key == "data-search-exclude":
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self.skip.add(el)
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return
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# Skip line numbers - see https://bit.ly/3GvubZx
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if key == "class" and value == "linenodiv":
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self.skip.add(el)
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return
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# Render opening tag if kept
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if not self.skip.intersection(self.context) and tag in self.keep:
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# Check whether we're inside the section title
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data = self.section.text
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if self.section.el in self.context:
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data = self.section.title
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# Append to section title or text
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data.append(f"<{tag}>")
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# Called at the end of every HTML tag
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def handle_endtag(self, tag):
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if not self.context or self.context[-1] != tag:
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return
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# Check whether we're exiting the current context, which happens when
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# a headline is nested in another element. In that case, we close the
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# current section, continuing to append data to the previous section,
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# which could also be a nested section – see https://bit.ly/3IxxIJZ
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if self.section.depth > len(self.context):
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for section in reversed(self.data):
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if section.depth <= len(self.context):
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# Set depth to infinity in order to denote that the current
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# section is exited and must never be considered again.
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self.section.depth = float("inf")
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self.section = section
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break
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# Remove element from skip list
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el = self.context.pop()
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if el in self.skip:
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if el.tag not in ["script", "style", "object"]:
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self.skip.remove(el)
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return
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# Render closing tag if kept
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if not self.skip.intersection(self.context) and tag in self.keep:
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# Check whether we're inside the section title
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data = self.section.text
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if self.section.el in self.context:
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data = self.section.title
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# Search for corresponding opening tag
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index = data.index(f"<{tag}>")
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for i in range(index + 1, len(data)):
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if not data[i].isspace():
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index = len(data)
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break
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# Remove element if empty (or only whitespace)
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if len(data) > index:
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while len(data) > index:
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data.pop()
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# Append to section title or text
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else:
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data.append(f"</{tag}>")
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# Called for the text contents of each tag
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def handle_data(self, data):
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if self.skip.intersection(self.context):
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return
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# Collapse whitespace in non-pre contexts
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if not "pre" in self.context:
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if not data.isspace():
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data = data.replace("\n", " ")
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else:
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data = " "
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# Handle preface - ensure top-level section
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if not self.section:
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self.section = Section(Element("hx"))
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self.data.append(self.section)
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# Handle section headline
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if self.section.el in self.context:
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permalink = False
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for el in self.context:
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if el.tag == "a" and el.attrs.get("class") == "headerlink":
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permalink = True
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# Ignore permalinks
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if not permalink:
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self.section.title.append(
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escape(data, quote = False)
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)
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# Collapse adjacent whitespace
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elif data.isspace():
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if not self.section.text or not self.section.text[-1].isspace():
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self.section.text.append(data)
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elif "pre" in self.context:
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self.section.text.append(data)
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# Handle everything else
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else:
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self.section.text.append(
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escape(data, quote = False)
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)
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# -----------------------------------------------------------------------------
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# Data
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# -----------------------------------------------------------------------------
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# Set up logging
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log = logging.getLogger("mkdocs.material.search")
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# Tags that are self-closing
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void = set([
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||
"area", # Image map areas
|
||
"base", # Document base
|
||
"br", # Line breaks
|
||
"col", # Table columns
|
||
"embed", # External content
|
||
"hr", # Horizontal rules
|
||
"img", # Images
|
||
"input", # Input fields
|
||
"link", # Links
|
||
"meta", # Metadata
|
||
"param", # External parameters
|
||
"source", # Image source sets
|
||
"track", # Text track
|
||
"wbr" # Line break opportunities
|
||
])
|