mirror of
https://github.com/squidfunk/mkdocs-material.git
synced 2024-12-21 03:45:57 +01:00
580 lines
19 KiB
Python
580 lines
19 KiB
Python
# Copyright (c) 2016-2024 Martin Donath <martin.donath@squidfunk.com>
|
||
|
||
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
# of this software and associated documentation files (the "Software"), to
|
||
# deal in the Software without restriction, including without limitation the
|
||
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
|
||
# sell copies of the Software, and to permit persons to whom the Software is
|
||
# furnished to do so, subject to the following conditions:
|
||
|
||
# The above copyright notice and this permission notice shall be included in
|
||
# all copies or substantial portions of the Software.
|
||
|
||
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
|
||
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
||
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
||
# IN THE SOFTWARE.
|
||
|
||
import json
|
||
import logging
|
||
import os
|
||
import regex as re
|
||
|
||
from html import escape
|
||
from html.parser import HTMLParser
|
||
from mkdocs import utils
|
||
from mkdocs.plugins import BasePlugin
|
||
|
||
from .config import SearchConfig
|
||
|
||
try:
|
||
import jieba
|
||
except ImportError:
|
||
jieba = None
|
||
|
||
# -----------------------------------------------------------------------------
|
||
# Classes
|
||
# -----------------------------------------------------------------------------
|
||
|
||
# Search plugin
|
||
class SearchPlugin(BasePlugin[SearchConfig]):
|
||
|
||
# Initialize plugin
|
||
def __init__(self, *args, **kwargs):
|
||
super().__init__(*args, **kwargs)
|
||
|
||
# Initialize incremental builds
|
||
self.is_dirty = False
|
||
self.is_dirtyreload = False
|
||
|
||
# Initialize search index cache
|
||
self.search_index_prev = None
|
||
|
||
# Determine whether we're serving the site
|
||
def on_startup(self, *, command, dirty):
|
||
self.is_dirty = dirty
|
||
|
||
# Initialize plugin
|
||
def on_config(self, config):
|
||
if not self.config.enabled:
|
||
return
|
||
|
||
# Retrieve default value for language
|
||
if not self.config.lang:
|
||
self.config.lang = [self._translate(
|
||
config, "search.config.lang"
|
||
)]
|
||
|
||
# Retrieve default value for separator
|
||
if not self.config.separator:
|
||
self.config.separator = self._translate(
|
||
config, "search.config.separator"
|
||
)
|
||
|
||
# Retrieve default value for pipeline
|
||
if self.config.pipeline is None:
|
||
self.config.pipeline = list(filter(len, re.split(
|
||
r"\s*,\s*", self._translate(config, "search.config.pipeline")
|
||
)))
|
||
|
||
# Initialize search index
|
||
self.search_index = SearchIndex(**self.config)
|
||
|
||
# Set jieba dictionary, if given
|
||
if self.config.jieba_dict:
|
||
path = os.path.normpath(self.config.jieba_dict)
|
||
if os.path.isfile(path):
|
||
jieba.set_dictionary(path)
|
||
log.debug(f"Loading jieba dictionary: {path}")
|
||
else:
|
||
log.warning(
|
||
f"Configuration error for 'search.jieba_dict': "
|
||
f"'{self.config.jieba_dict}' does not exist."
|
||
)
|
||
|
||
# Set jieba user dictionary, if given
|
||
if self.config.jieba_dict_user:
|
||
path = os.path.normpath(self.config.jieba_dict_user)
|
||
if os.path.isfile(path):
|
||
jieba.load_userdict(path)
|
||
log.debug(f"Loading jieba user dictionary: {path}")
|
||
else:
|
||
log.warning(
|
||
f"Configuration error for 'search.jieba_dict_user': "
|
||
f"'{self.config.jieba_dict_user}' does not exist."
|
||
)
|
||
|
||
# Add page to search index
|
||
def on_page_context(self, context, *, page, config, nav):
|
||
if not self.config.enabled:
|
||
return
|
||
|
||
# Index page
|
||
self.search_index.add_entry_from_context(page)
|
||
page.content = re.sub(
|
||
r"\s?data-search-\w+=\"[^\"]+\"",
|
||
"",
|
||
page.content
|
||
)
|
||
|
||
# Generate search index
|
||
def on_post_build(self, *, config):
|
||
if not self.config.enabled:
|
||
return
|
||
|
||
# Write search index
|
||
base = os.path.join(config.site_dir, "search")
|
||
path = os.path.join(base, "search_index.json")
|
||
|
||
# Generate and write search index to file
|
||
data = self.search_index.generate_search_index(self.search_index_prev)
|
||
utils.write_file(data.encode("utf-8"), path)
|
||
|
||
# Persist search index for repeated invocation
|
||
if self.is_dirty:
|
||
self.search_index_prev = self.search_index
|
||
|
||
# Determine whether we're running under dirty reload
|
||
def on_serve(self, server, *, config, builder):
|
||
self.is_dirtyreload = self.is_dirty
|
||
|
||
# -------------------------------------------------------------------------
|
||
|
||
# Translate the given placeholder value
|
||
def _translate(self, config, value):
|
||
env = config.theme.get_env()
|
||
|
||
# Load language template and return translation for placeholder
|
||
language = "partials/language.html"
|
||
template = env.get_template(language, None, { "config": config })
|
||
return template.module.t(value)
|
||
|
||
# -----------------------------------------------------------------------------
|
||
|
||
# Search index with support for additional fields
|
||
class SearchIndex:
|
||
|
||
# Initialize search index
|
||
def __init__(self, **config):
|
||
self.config = config
|
||
self.entries = []
|
||
|
||
# Add page to search index
|
||
def add_entry_from_context(self, page):
|
||
search = page.meta.get("search") or {}
|
||
if search.get("exclude"):
|
||
return
|
||
|
||
# Divide page content into sections
|
||
parser = Parser()
|
||
parser.feed(page.content)
|
||
parser.close()
|
||
|
||
# Add sections to index
|
||
for section in parser.data:
|
||
if not section.is_excluded():
|
||
self.create_entry_for_section(section, page.toc, page.url, page)
|
||
|
||
# Override: graceful indexing and additional fields
|
||
def create_entry_for_section(self, section, toc, url, page):
|
||
item = self._find_toc_by_id(toc, section.id)
|
||
if item:
|
||
url = url + item.url
|
||
elif section.id:
|
||
url = url + "#" + section.id
|
||
|
||
# Set page title as section title if none was given, which happens when
|
||
# the first headline in a Markdown document is not a h1 headline. Also,
|
||
# if a page title was set via front matter, use that even though a h1
|
||
# might be given or the page name was specified in nav in mkdocs.yml
|
||
if not section.title:
|
||
section.title = [str(page.meta.get("title", page.title))]
|
||
|
||
# Compute title and text
|
||
title = "".join(section.title).strip()
|
||
text = "".join(section.text).strip()
|
||
|
||
# Segment Chinese characters if jieba is available
|
||
if jieba:
|
||
title = self._segment_chinese(title)
|
||
text = self._segment_chinese(text)
|
||
|
||
# Create entry for section
|
||
entry = {
|
||
"location": url,
|
||
"title": title,
|
||
"text": text
|
||
}
|
||
|
||
# Set document tags
|
||
tags = page.meta.get("tags")
|
||
if isinstance(tags, list):
|
||
entry["tags"] = []
|
||
for name in tags:
|
||
if name and isinstance(name, (str, int, float, bool)):
|
||
entry["tags"].append(str(name))
|
||
|
||
# Set document boost
|
||
search = page.meta.get("search") or {}
|
||
if "boost" in search:
|
||
entry["boost"] = search["boost"]
|
||
|
||
# Add entry to index
|
||
self.entries.append(entry)
|
||
|
||
# Generate search index
|
||
def generate_search_index(self, prev):
|
||
config = {
|
||
key: self.config[key]
|
||
for key in ["lang", "separator", "pipeline"]
|
||
}
|
||
|
||
# Hack: if we're running under dirty reload, the search index will only
|
||
# include the entries for the current page. However, MkDocs > 1.4 allows
|
||
# us to persist plugin state across rebuilds, which is exactly what we
|
||
# do by passing the previously built index to this method. Thus, we just
|
||
# remove the previous entries for the current page, and append the new
|
||
# entries to the end of the index, as order doesn't matter.
|
||
if prev and self.entries:
|
||
path = self.entries[0]["location"]
|
||
|
||
# Since we're sure that we're running under dirty reload, the list
|
||
# of entries will only contain sections for a single page. Thus, we
|
||
# use the first entry to remove all entries from the previous run
|
||
# that belong to the current page. The rationale behind this is that
|
||
# authors might add or remove section headers, so we need to make
|
||
# sure that sections are synchronized correctly.
|
||
entries = [
|
||
entry for entry in prev.entries
|
||
if not entry["location"].startswith(path)
|
||
]
|
||
|
||
# Merge previous with current entries
|
||
self.entries = entries + self.entries
|
||
|
||
# Otherwise just set previous entries
|
||
if prev and not self.entries:
|
||
self.entries = prev.entries
|
||
|
||
# Return search index as JSON
|
||
data = { "config": config, "docs": self.entries }
|
||
return json.dumps(
|
||
data,
|
||
separators = (",", ":"),
|
||
default = str
|
||
)
|
||
|
||
# -------------------------------------------------------------------------
|
||
|
||
# Retrieve item for anchor
|
||
def _find_toc_by_id(self, toc, id):
|
||
for toc_item in toc:
|
||
if toc_item.id == id:
|
||
return toc_item
|
||
|
||
# Recurse into children of item
|
||
toc_item = self._find_toc_by_id(toc_item.children, id)
|
||
if toc_item is not None:
|
||
return toc_item
|
||
|
||
# No item found
|
||
return None
|
||
|
||
# Find and segment Chinese characters in string
|
||
def _segment_chinese(self, data):
|
||
expr = re.compile(r"(\p{IsHan}+)", re.UNICODE)
|
||
|
||
# Replace callback
|
||
def replace(match):
|
||
value = match.group(0)
|
||
|
||
# Replace occurrence in original string with segmented version and
|
||
# surround with zero-width whitespace for efficient indexing
|
||
return "".join([
|
||
"\u200b",
|
||
"\u200b".join(jieba.cut(value.encode("utf-8"))),
|
||
"\u200b",
|
||
])
|
||
|
||
# Return string with segmented occurrences
|
||
return expr.sub(replace, data).strip("\u200b")
|
||
|
||
# -----------------------------------------------------------------------------
|
||
|
||
# HTML element
|
||
class Element:
|
||
"""
|
||
An element with attributes, essentially a small wrapper object for the
|
||
parser to access attributes in other callbacks than handle_starttag.
|
||
"""
|
||
|
||
# Initialize HTML element
|
||
def __init__(self, tag, attrs = None):
|
||
self.tag = tag
|
||
self.attrs = attrs or {}
|
||
|
||
# String representation
|
||
def __repr__(self):
|
||
return self.tag
|
||
|
||
# Support comparison (compare by tag only)
|
||
def __eq__(self, other):
|
||
if other is Element:
|
||
return self.tag == other.tag
|
||
else:
|
||
return self.tag == other
|
||
|
||
# Support set operations
|
||
def __hash__(self):
|
||
return hash(self.tag)
|
||
|
||
# Check whether the element should be excluded
|
||
def is_excluded(self):
|
||
return "data-search-exclude" in self.attrs
|
||
|
||
# -----------------------------------------------------------------------------
|
||
|
||
# HTML section
|
||
class Section:
|
||
"""
|
||
A block of text with markup, preceded by a title (with markup), i.e., a
|
||
headline with a certain level (h1-h6). Internally used by the parser.
|
||
"""
|
||
|
||
# Initialize HTML section
|
||
def __init__(self, el, depth = 0):
|
||
self.el = el
|
||
self.depth = depth
|
||
|
||
# Initialize section data
|
||
self.text = []
|
||
self.title = []
|
||
self.id = None
|
||
|
||
# String representation
|
||
def __repr__(self):
|
||
if self.id:
|
||
return "#".join([self.el.tag, self.id])
|
||
else:
|
||
return self.el.tag
|
||
|
||
# Check whether the section should be excluded
|
||
def is_excluded(self):
|
||
return self.el.is_excluded()
|
||
|
||
# -----------------------------------------------------------------------------
|
||
|
||
# HTML parser
|
||
class Parser(HTMLParser):
|
||
"""
|
||
This parser divides the given string of HTML into a list of sections, each
|
||
of which are preceded by a h1-h6 level heading. A white- and blacklist of
|
||
tags dictates which tags should be preserved as part of the index, and
|
||
which should be ignored in their entirety.
|
||
"""
|
||
|
||
# Initialize HTML parser
|
||
def __init__(self, *args, **kwargs):
|
||
super().__init__(*args, **kwargs)
|
||
|
||
# Tags to skip
|
||
self.skip = set([
|
||
"object", # Objects
|
||
"script", # Scripts
|
||
"style" # Styles
|
||
])
|
||
|
||
# Tags to keep
|
||
self.keep = set([
|
||
"p", # Paragraphs
|
||
"code", "pre", # Code blocks
|
||
"li", "ol", "ul", # Lists
|
||
"sub", "sup" # Sub- and superscripts
|
||
])
|
||
|
||
# Current context and section
|
||
self.context = []
|
||
self.section = None
|
||
|
||
# All parsed sections
|
||
self.data = []
|
||
|
||
# Called at the start of every HTML tag
|
||
def handle_starttag(self, tag, attrs):
|
||
attrs = dict(attrs)
|
||
|
||
# Ignore self-closing tags
|
||
el = Element(tag, attrs)
|
||
if not tag in void:
|
||
self.context.append(el)
|
||
else:
|
||
return
|
||
|
||
# Handle heading
|
||
if tag in ([f"h{x}" for x in range(1, 7)]):
|
||
depth = len(self.context)
|
||
if "id" in attrs:
|
||
|
||
# Ensure top-level section
|
||
if tag != "h1" and not self.data:
|
||
self.section = Section(Element("hx"), depth)
|
||
self.data.append(self.section)
|
||
|
||
# Set identifier, if not first section
|
||
self.section = Section(el, depth)
|
||
if self.data:
|
||
self.section.id = attrs["id"]
|
||
|
||
# Append section to list
|
||
self.data.append(self.section)
|
||
|
||
# Handle preface - ensure top-level section
|
||
if not self.section:
|
||
self.section = Section(Element("hx"))
|
||
self.data.append(self.section)
|
||
|
||
# Handle special cases to skip
|
||
for key, value in attrs.items():
|
||
|
||
# Skip block if explicitly excluded from search
|
||
if key == "data-search-exclude":
|
||
self.skip.add(el)
|
||
return
|
||
|
||
# Skip line numbers - see https://bit.ly/3GvubZx
|
||
if key == "class" and value == "linenodiv":
|
||
self.skip.add(el)
|
||
return
|
||
|
||
# Render opening tag if kept
|
||
if not self.skip.intersection(self.context) and tag in self.keep:
|
||
|
||
# Check whether we're inside the section title
|
||
data = self.section.text
|
||
if self.section.el in self.context:
|
||
data = self.section.title
|
||
|
||
# Append to section title or text
|
||
data.append(f"<{tag}>")
|
||
|
||
# Called at the end of every HTML tag
|
||
def handle_endtag(self, tag):
|
||
if not self.context or self.context[-1] != tag:
|
||
return
|
||
|
||
# Check whether we're exiting the current context, which happens when
|
||
# a headline is nested in another element. In that case, we close the
|
||
# current section, continuing to append data to the previous section,
|
||
# which could also be a nested section – see https://bit.ly/3IxxIJZ
|
||
if self.section.depth > len(self.context):
|
||
for section in reversed(self.data):
|
||
if section.depth <= len(self.context):
|
||
|
||
# Set depth to infinity in order to denote that the current
|
||
# section is exited and must never be considered again.
|
||
self.section.depth = float("inf")
|
||
self.section = section
|
||
break
|
||
|
||
# Remove element from skip list
|
||
el = self.context.pop()
|
||
if el in self.skip:
|
||
if el.tag not in ["script", "style", "object"]:
|
||
self.skip.remove(el)
|
||
return
|
||
|
||
# Render closing tag if kept
|
||
if not self.skip.intersection(self.context) and tag in self.keep:
|
||
|
||
# Check whether we're inside the section title
|
||
data = self.section.text
|
||
if self.section.el in self.context:
|
||
data = self.section.title
|
||
|
||
# Search for corresponding opening tag
|
||
index = data.index(f"<{tag}>")
|
||
for i in range(index + 1, len(data)):
|
||
if not data[i].isspace():
|
||
index = len(data)
|
||
break
|
||
|
||
# Remove element if empty (or only whitespace)
|
||
if len(data) > index:
|
||
while len(data) > index:
|
||
data.pop()
|
||
|
||
# Append to section title or text
|
||
else:
|
||
data.append(f"</{tag}>")
|
||
|
||
# Called for the text contents of each tag
|
||
def handle_data(self, data):
|
||
if self.skip.intersection(self.context):
|
||
return
|
||
|
||
# Collapse whitespace in non-pre contexts
|
||
if not "pre" in self.context:
|
||
if not data.isspace():
|
||
data = data.replace("\n", " ")
|
||
else:
|
||
data = " "
|
||
|
||
# Handle preface - ensure top-level section
|
||
if not self.section:
|
||
self.section = Section(Element("hx"))
|
||
self.data.append(self.section)
|
||
|
||
# Handle section headline
|
||
if self.section.el in self.context:
|
||
permalink = False
|
||
for el in self.context:
|
||
if el.tag == "a" and el.attrs.get("class") == "headerlink":
|
||
permalink = True
|
||
|
||
# Ignore permalinks
|
||
if not permalink:
|
||
self.section.title.append(
|
||
escape(data, quote = False)
|
||
)
|
||
|
||
# Collapse adjacent whitespace
|
||
elif data.isspace():
|
||
if not self.section.text or not self.section.text[-1].isspace():
|
||
self.section.text.append(data)
|
||
elif "pre" in self.context:
|
||
self.section.text.append(data)
|
||
|
||
# Handle everything else
|
||
else:
|
||
self.section.text.append(
|
||
escape(data, quote = False)
|
||
)
|
||
|
||
# -----------------------------------------------------------------------------
|
||
# Data
|
||
# -----------------------------------------------------------------------------
|
||
|
||
# Set up logging
|
||
log = logging.getLogger("mkdocs.material.search")
|
||
|
||
# Tags that are self-closing
|
||
void = set([
|
||
"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
|
||
])
|