574 lines
18 KiB
JavaScript
574 lines
18 KiB
JavaScript
/*
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* searchtools.js
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* ~~~~~~~~~~~~~~~~
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*
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* Sphinx JavaScript utilities for the full-text search.
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*
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* :copyright: Copyright 2007-2023 by the Sphinx team, see AUTHORS.
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* :license: BSD, see LICENSE for details.
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*
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*/
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"use strict";
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/**
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* Simple result scoring code.
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*/
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if (typeof Scorer === "undefined") {
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var Scorer = {
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// Implement the following function to further tweak the score for each result
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// The function takes a result array [docname, title, anchor, descr, score, filename]
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// and returns the new score.
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/*
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score: result => {
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const [docname, title, anchor, descr, score, filename] = result
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return score
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},
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*/
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// query matches the full name of an object
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objNameMatch: 11,
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// or matches in the last dotted part of the object name
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objPartialMatch: 6,
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// Additive scores depending on the priority of the object
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objPrio: {
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0: 15, // used to be importantResults
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1: 5, // used to be objectResults
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2: -5, // used to be unimportantResults
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},
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// Used when the priority is not in the mapping.
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objPrioDefault: 0,
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// query found in title
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title: 15,
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partialTitle: 7,
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// query found in terms
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term: 5,
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partialTerm: 2,
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};
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}
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const _removeChildren = (element) => {
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while (element && element.lastChild) element.removeChild(element.lastChild);
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};
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/**
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* See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions#escaping
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*/
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const _escapeRegExp = (string) =>
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string.replace(/[.*+\-?^${}()|[\]\\]/g, "\\$&"); // $& means the whole matched string
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const _displayItem = (item, searchTerms, highlightTerms) => {
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const docBuilder = DOCUMENTATION_OPTIONS.BUILDER;
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const docFileSuffix = DOCUMENTATION_OPTIONS.FILE_SUFFIX;
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const docLinkSuffix = DOCUMENTATION_OPTIONS.LINK_SUFFIX;
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const showSearchSummary = DOCUMENTATION_OPTIONS.SHOW_SEARCH_SUMMARY;
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const contentRoot = document.documentElement.dataset.content_root;
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const [docName, title, anchor, descr, score, _filename] = item;
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let listItem = document.createElement("li");
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let requestUrl;
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let linkUrl;
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if (docBuilder === "dirhtml") {
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// dirhtml builder
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let dirname = docName + "/";
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if (dirname.match(/\/index\/$/))
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dirname = dirname.substring(0, dirname.length - 6);
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else if (dirname === "index/") dirname = "";
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requestUrl = contentRoot + dirname;
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linkUrl = requestUrl;
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} else {
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// normal html builders
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requestUrl = contentRoot + docName + docFileSuffix;
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linkUrl = docName + docLinkSuffix;
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}
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let linkEl = listItem.appendChild(document.createElement("a"));
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linkEl.href = linkUrl + anchor;
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linkEl.dataset.score = score;
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linkEl.innerHTML = title;
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if (descr) {
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listItem.appendChild(document.createElement("span")).innerHTML =
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" (" + descr + ")";
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// highlight search terms in the description
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if (SPHINX_HIGHLIGHT_ENABLED) // set in sphinx_highlight.js
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highlightTerms.forEach((term) => _highlightText(listItem, term, "highlighted"));
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}
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else if (showSearchSummary)
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fetch(requestUrl)
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.then((responseData) => responseData.text())
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.then((data) => {
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if (data)
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listItem.appendChild(
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Search.makeSearchSummary(data, searchTerms)
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);
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// highlight search terms in the summary
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if (SPHINX_HIGHLIGHT_ENABLED) // set in sphinx_highlight.js
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highlightTerms.forEach((term) => _highlightText(listItem, term, "highlighted"));
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});
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Search.output.appendChild(listItem);
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};
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const _finishSearch = (resultCount) => {
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Search.stopPulse();
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Search.title.innerText = _("Search Results");
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if (!resultCount)
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Search.status.innerText = Documentation.gettext(
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"Your search did not match any documents. Please make sure that all words are spelled correctly and that you've selected enough categories."
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);
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else
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Search.status.innerText = _(
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`Search finished, found ${resultCount} page(s) matching the search query.`
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);
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};
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const _displayNextItem = (
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results,
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resultCount,
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searchTerms,
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highlightTerms,
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) => {
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// results left, load the summary and display it
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// this is intended to be dynamic (don't sub resultsCount)
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if (results.length) {
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_displayItem(results.pop(), searchTerms, highlightTerms);
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setTimeout(
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() => _displayNextItem(results, resultCount, searchTerms, highlightTerms),
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5
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);
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}
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// search finished, update title and status message
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else _finishSearch(resultCount);
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};
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/**
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* Default splitQuery function. Can be overridden in ``sphinx.search`` with a
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* custom function per language.
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*
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* The regular expression works by splitting the string on consecutive characters
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* that are not Unicode letters, numbers, underscores, or emoji characters.
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* This is the same as ``\W+`` in Python, preserving the surrogate pair area.
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*/
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if (typeof splitQuery === "undefined") {
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var splitQuery = (query) => query
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.split(/[^\p{Letter}\p{Number}_\p{Emoji_Presentation}]+/gu)
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.filter(term => term) // remove remaining empty strings
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}
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/**
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* Search Module
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*/
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const Search = {
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_index: null,
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_queued_query: null,
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_pulse_status: -1,
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htmlToText: (htmlString) => {
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const htmlElement = new DOMParser().parseFromString(htmlString, 'text/html');
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htmlElement.querySelectorAll(".headerlink").forEach((el) => { el.remove() });
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const docContent = htmlElement.querySelector('[role="main"]');
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if (docContent !== undefined) return docContent.textContent;
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console.warn(
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"Content block not found. Sphinx search tries to obtain it via '[role=main]'. Could you check your theme or template."
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);
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return "";
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},
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init: () => {
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const query = new URLSearchParams(window.location.search).get("q");
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document
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.querySelectorAll('input[name="q"]')
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.forEach((el) => (el.value = query));
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if (query) Search.performSearch(query);
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},
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loadIndex: (url) =>
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(document.body.appendChild(document.createElement("script")).src = url),
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setIndex: (index) => {
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Search._index = index;
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if (Search._queued_query !== null) {
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const query = Search._queued_query;
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Search._queued_query = null;
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Search.query(query);
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}
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},
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hasIndex: () => Search._index !== null,
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deferQuery: (query) => (Search._queued_query = query),
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stopPulse: () => (Search._pulse_status = -1),
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startPulse: () => {
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if (Search._pulse_status >= 0) return;
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const pulse = () => {
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Search._pulse_status = (Search._pulse_status + 1) % 4;
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Search.dots.innerText = ".".repeat(Search._pulse_status);
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if (Search._pulse_status >= 0) window.setTimeout(pulse, 500);
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};
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pulse();
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},
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/**
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* perform a search for something (or wait until index is loaded)
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*/
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performSearch: (query) => {
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// create the required interface elements
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const searchText = document.createElement("h2");
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searchText.textContent = _("Searching");
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const searchSummary = document.createElement("p");
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searchSummary.classList.add("search-summary");
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searchSummary.innerText = "";
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const searchList = document.createElement("ul");
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searchList.classList.add("search");
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const out = document.getElementById("search-results");
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Search.title = out.appendChild(searchText);
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Search.dots = Search.title.appendChild(document.createElement("span"));
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Search.status = out.appendChild(searchSummary);
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Search.output = out.appendChild(searchList);
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const searchProgress = document.getElementById("search-progress");
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// Some themes don't use the search progress node
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if (searchProgress) {
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searchProgress.innerText = _("Preparing search...");
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}
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Search.startPulse();
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// index already loaded, the browser was quick!
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if (Search.hasIndex()) Search.query(query);
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else Search.deferQuery(query);
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},
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/**
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* execute search (requires search index to be loaded)
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*/
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query: (query) => {
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const filenames = Search._index.filenames;
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const docNames = Search._index.docnames;
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const titles = Search._index.titles;
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const allTitles = Search._index.alltitles;
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const indexEntries = Search._index.indexentries;
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// stem the search terms and add them to the correct list
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const stemmer = new Stemmer();
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const searchTerms = new Set();
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const excludedTerms = new Set();
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const highlightTerms = new Set();
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const objectTerms = new Set(splitQuery(query.toLowerCase().trim()));
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splitQuery(query.trim()).forEach((queryTerm) => {
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const queryTermLower = queryTerm.toLowerCase();
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// maybe skip this "word"
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// stopwords array is from language_data.js
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if (
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stopwords.indexOf(queryTermLower) !== -1 ||
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queryTerm.match(/^\d+$/)
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)
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return;
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// stem the word
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let word = stemmer.stemWord(queryTermLower);
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// select the correct list
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if (word[0] === "-") excludedTerms.add(word.substr(1));
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else {
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searchTerms.add(word);
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highlightTerms.add(queryTermLower);
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}
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});
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if (SPHINX_HIGHLIGHT_ENABLED) { // set in sphinx_highlight.js
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localStorage.setItem("sphinx_highlight_terms", [...highlightTerms].join(" "))
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}
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// console.debug("SEARCH: searching for:");
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// console.info("required: ", [...searchTerms]);
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// console.info("excluded: ", [...excludedTerms]);
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// array of [docname, title, anchor, descr, score, filename]
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let results = [];
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_removeChildren(document.getElementById("search-progress"));
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const queryLower = query.toLowerCase();
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for (const [title, foundTitles] of Object.entries(allTitles)) {
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if (title.toLowerCase().includes(queryLower) && (queryLower.length >= title.length/2)) {
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for (const [file, id] of foundTitles) {
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let score = Math.round(100 * queryLower.length / title.length)
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results.push([
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docNames[file],
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titles[file] !== title ? `${titles[file]} > ${title}` : title,
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id !== null ? "#" + id : "",
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null,
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score,
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filenames[file],
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]);
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}
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}
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}
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// search for explicit entries in index directives
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for (const [entry, foundEntries] of Object.entries(indexEntries)) {
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if (entry.includes(queryLower) && (queryLower.length >= entry.length/2)) {
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for (const [file, id] of foundEntries) {
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let score = Math.round(100 * queryLower.length / entry.length)
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results.push([
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docNames[file],
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titles[file],
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id ? "#" + id : "",
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null,
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score,
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filenames[file],
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]);
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}
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}
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}
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// lookup as object
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objectTerms.forEach((term) =>
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results.push(...Search.performObjectSearch(term, objectTerms))
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);
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// lookup as search terms in fulltext
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results.push(...Search.performTermsSearch(searchTerms, excludedTerms));
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// let the scorer override scores with a custom scoring function
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if (Scorer.score) results.forEach((item) => (item[4] = Scorer.score(item)));
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// now sort the results by score (in opposite order of appearance, since the
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// display function below uses pop() to retrieve items) and then
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// alphabetically
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results.sort((a, b) => {
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const leftScore = a[4];
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const rightScore = b[4];
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if (leftScore === rightScore) {
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// same score: sort alphabetically
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const leftTitle = a[1].toLowerCase();
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const rightTitle = b[1].toLowerCase();
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if (leftTitle === rightTitle) return 0;
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return leftTitle > rightTitle ? -1 : 1; // inverted is intentional
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}
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return leftScore > rightScore ? 1 : -1;
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});
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// remove duplicate search results
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// note the reversing of results, so that in the case of duplicates, the highest-scoring entry is kept
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let seen = new Set();
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results = results.reverse().reduce((acc, result) => {
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let resultStr = result.slice(0, 4).concat([result[5]]).map(v => String(v)).join(',');
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if (!seen.has(resultStr)) {
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acc.push(result);
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seen.add(resultStr);
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}
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return acc;
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}, []);
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results = results.reverse();
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// for debugging
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//Search.lastresults = results.slice(); // a copy
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// console.info("search results:", Search.lastresults);
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// print the results
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_displayNextItem(results, results.length, searchTerms, highlightTerms);
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},
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/**
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* search for object names
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*/
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performObjectSearch: (object, objectTerms) => {
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const filenames = Search._index.filenames;
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const docNames = Search._index.docnames;
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const objects = Search._index.objects;
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const objNames = Search._index.objnames;
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const titles = Search._index.titles;
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const results = [];
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const objectSearchCallback = (prefix, match) => {
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const name = match[4]
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const fullname = (prefix ? prefix + "." : "") + name;
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const fullnameLower = fullname.toLowerCase();
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if (fullnameLower.indexOf(object) < 0) return;
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let score = 0;
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const parts = fullnameLower.split(".");
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// check for different match types: exact matches of full name or
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// "last name" (i.e. last dotted part)
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if (fullnameLower === object || parts.slice(-1)[0] === object)
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score += Scorer.objNameMatch;
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else if (parts.slice(-1)[0].indexOf(object) > -1)
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score += Scorer.objPartialMatch; // matches in last name
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const objName = objNames[match[1]][2];
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const title = titles[match[0]];
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// If more than one term searched for, we require other words to be
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// found in the name/title/description
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const otherTerms = new Set(objectTerms);
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otherTerms.delete(object);
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if (otherTerms.size > 0) {
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const haystack = `${prefix} ${name} ${objName} ${title}`.toLowerCase();
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if (
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[...otherTerms].some((otherTerm) => haystack.indexOf(otherTerm) < 0)
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)
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return;
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}
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let anchor = match[3];
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if (anchor === "") anchor = fullname;
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else if (anchor === "-") anchor = objNames[match[1]][1] + "-" + fullname;
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const descr = objName + _(", in ") + title;
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// add custom score for some objects according to scorer
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if (Scorer.objPrio.hasOwnProperty(match[2]))
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score += Scorer.objPrio[match[2]];
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else score += Scorer.objPrioDefault;
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results.push([
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docNames[match[0]],
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fullname,
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"#" + anchor,
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descr,
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score,
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filenames[match[0]],
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]);
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};
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Object.keys(objects).forEach((prefix) =>
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objects[prefix].forEach((array) =>
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objectSearchCallback(prefix, array)
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)
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);
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return results;
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},
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/**
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* search for full-text terms in the index
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*/
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performTermsSearch: (searchTerms, excludedTerms) => {
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// prepare search
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const terms = Search._index.terms;
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const titleTerms = Search._index.titleterms;
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const filenames = Search._index.filenames;
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const docNames = Search._index.docnames;
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const titles = Search._index.titles;
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const scoreMap = new Map();
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const fileMap = new Map();
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// perform the search on the required terms
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searchTerms.forEach((word) => {
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const files = [];
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const arr = [
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{ files: terms[word], score: Scorer.term },
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{ files: titleTerms[word], score: Scorer.title },
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];
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// add support for partial matches
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if (word.length > 2) {
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const escapedWord = _escapeRegExp(word);
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Object.keys(terms).forEach((term) => {
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if (term.match(escapedWord) && !terms[word])
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arr.push({ files: terms[term], score: Scorer.partialTerm });
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});
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Object.keys(titleTerms).forEach((term) => {
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if (term.match(escapedWord) && !titleTerms[word])
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arr.push({ files: titleTerms[word], score: Scorer.partialTitle });
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});
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}
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// no match but word was a required one
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if (arr.every((record) => record.files === undefined)) return;
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// found search word in contents
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arr.forEach((record) => {
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if (record.files === undefined) return;
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let recordFiles = record.files;
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if (recordFiles.length === undefined) recordFiles = [recordFiles];
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files.push(...recordFiles);
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// set score for the word in each file
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recordFiles.forEach((file) => {
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if (!scoreMap.has(file)) scoreMap.set(file, {});
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scoreMap.get(file)[word] = record.score;
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});
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});
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// create the mapping
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files.forEach((file) => {
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if (fileMap.has(file) && fileMap.get(file).indexOf(word) === -1)
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fileMap.get(file).push(word);
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else fileMap.set(file, [word]);
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});
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});
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// now check if the files don't contain excluded terms
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const results = [];
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for (const [file, wordList] of fileMap) {
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// check if all requirements are matched
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// as search terms with length < 3 are discarded
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const filteredTermCount = [...searchTerms].filter(
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(term) => term.length > 2
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).length;
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if (
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wordList.length !== searchTerms.size &&
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wordList.length !== filteredTermCount
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)
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continue;
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// ensure that none of the excluded terms is in the search result
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if (
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[...excludedTerms].some(
|
|
(term) =>
|
|
terms[term] === file ||
|
|
titleTerms[term] === file ||
|
|
(terms[term] || []).includes(file) ||
|
|
(titleTerms[term] || []).includes(file)
|
|
)
|
|
)
|
|
break;
|
|
|
|
// select one (max) score for the file.
|
|
const score = Math.max(...wordList.map((w) => scoreMap.get(file)[w]));
|
|
// add result to the result list
|
|
results.push([
|
|
docNames[file],
|
|
titles[file],
|
|
"",
|
|
null,
|
|
score,
|
|
filenames[file],
|
|
]);
|
|
}
|
|
return results;
|
|
},
|
|
|
|
/**
|
|
* helper function to return a node containing the
|
|
* search summary for a given text. keywords is a list
|
|
* of stemmed words.
|
|
*/
|
|
makeSearchSummary: (htmlText, keywords) => {
|
|
const text = Search.htmlToText(htmlText);
|
|
if (text === "") return null;
|
|
|
|
const textLower = text.toLowerCase();
|
|
const actualStartPosition = [...keywords]
|
|
.map((k) => textLower.indexOf(k.toLowerCase()))
|
|
.filter((i) => i > -1)
|
|
.slice(-1)[0];
|
|
const startWithContext = Math.max(actualStartPosition - 120, 0);
|
|
|
|
const top = startWithContext === 0 ? "" : "...";
|
|
const tail = startWithContext + 240 < text.length ? "..." : "";
|
|
|
|
let summary = document.createElement("p");
|
|
summary.classList.add("context");
|
|
summary.textContent = top + text.substr(startWithContext, 240).trim() + tail;
|
|
|
|
return summary;
|
|
},
|
|
};
|
|
|
|
_ready(Search.init);
|