gnome-shell/js/ui/search.js

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// -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
const Gio = imports.gi.Gio;
const GLib = imports.gi.GLib;
const Lang = imports.lang;
const Signals = imports.signals;
const Shell = imports.gi.Shell;
const Util = imports.misc.util;
const FileUtils = imports.misc.fileUtils;
const Main = imports.ui.main;
// Not currently referenced by the search API, but
// this enumeration can be useful for provider
// implementations.
const MatchType = {
NONE: 0,
SUBSTRING: 1,
PREFIX: 2
};
const SearchResultDisplay = new Lang.Class({
Name: 'SearchResultDisplay',
_init: function(provider) {
this.provider = provider;
this.actor = null;
},
/**
* renderResults:
* @results: List of identifier strings
* @terms: List of search term strings
*
* Display the given search matches which resulted
* from the given terms. It's expected that not
* all results will fit in the space for the container
* actor; in this case, show as many as makes sense
* for your result type.
*
* The terms are useful for search match highlighting.
*/
renderResults: function(results, terms) {
throw new Error('Not implemented');
},
/**
* clear:
* Remove all results from this display.
*/
clear: function() {
this.actor.destroy_all_children();
},
/**
* getVisibleResultCount:
*
* Returns: The number of actors visible.
*/
getVisibleResultCount: function() {
throw new Error('Not implemented');
},
});
/**
* SearchProvider:
*
* Subclass this object to add a new result type
* to the search system, then call registerProvider()
* in SearchSystem with an instance.
* Search is asynchronous and uses the
* getInitialResultSet()/getSubsearchResultSet() methods.
*/
const SearchProvider = new Lang.Class({
Name: 'SearchProvider',
_init: function(title) {
this.title = title;
this.searchSystem = null;
},
/**
* getInitialResultSet:
* @terms: Array of search terms, treated as logical AND
*
* Called when the user first begins a search (most likely
* therefore a single term of length one or two), or when
* a new term is added.
*
* Should "return" an array of result identifier strings representing
* items which match the given search terms. This
* is expected to be a substring match on the metadata for a given
* item. Ordering of returned results is up to the discretion of the provider,
* but you should follow these heruistics:
*
* * Put items where the term matches multiple criteria (e.g. name and
* description) before single matches
* * Put items which match on a prefix before non-prefix substring matches
*
* We say "return" above, but in order to make the query asynchronous, use
* this.searchSystem.pushResults();. The return value should be ignored.
*
* This function should be fast; do not perform unindexed full-text searches
* or network queries.
*/
getInitialResultSet: function(terms) {
throw new Error('Not implemented');
},
/**
* getSubsearchResultSet:
* @previousResults: Array of item identifiers
* @newTerms: Updated search terms
*
* Called when a search is performed which is a "subsearch" of
* the previous search; i.e. when every search term has exactly
* one corresponding term in the previous search which is a prefix
* of the new term.
*
* This allows search providers to only search through the previous
* result set, rather than possibly performing a full re-query.
*
* Similar to getInitialResultSet, the return value for this will
* be ignored; use this.searchSystem.pushResults();.
*/
getSubsearchResultSet: function(previousResults, newTerms) {
throw new Error('Not implemented');
},
/**
* getResultMetas:
* @ids: Result identifier strings
*
* Call callback with array of objects with 'id', 'name', (both strings) and
* 'createIcon' (function(size) returning a Clutter.Texture) properties
* with the same number of members as @ids
*/
getResultMetas: function(ids, callback) {
throw new Error('Not implemented');
},
/**
* createResultActor:
* @resultMeta: Object with result metadata
* @terms: Array of search terms, should be used for highlighting
*
* Search providers may optionally override this to render a
* particular serch result in a custom fashion. The default
* implementation will show the icon next to the name.
*
* The actor should be an instance of St.Widget, with the style class
* 'search-result-content'.
*/
createResultActor: function(resultMeta, terms) {
return null;
},
/**
* activateResult:
* @id: Result identifier string
*
* Called when the user chooses a given result.
*/
activateResult: function(id) {
throw new Error('Not implemented');
},
/**
* launchSearch:
* @terms: Current search terms
*
* Called when the user clicks the provider icon.
*/
launchSearch: function(terms) {
throw new Error('Not implemented');
}
});
Signals.addSignalMethods(SearchProvider.prototype);
const SearchSystem = new Lang.Class({
Name: 'SearchSystem',
_init: function() {
this._providers = [];
this.reset();
},
registerProvider: function (provider) {
provider.searchSystem = this;
this._providers.push(provider);
},
unregisterProvider: function (provider) {
let index = this._providers.indexOf(provider);
if (index == -1)
return;
provider.searchSystem = null;
this._providers.splice(index, 1);
},
getProviders: function() {
return this._providers;
},
getTerms: function() {
return this._previousTerms;
},
reset: function() {
this._previousTerms = [];
this._previousResults = [];
},
pushResults: function(provider, results) {
let i = this._providers.indexOf(provider);
if (i == -1)
return;
this._previousResults[i] = [provider, results];
this.emit('search-updated', this._previousResults[i]);
},
updateSearch: function(searchString) {
searchString = searchString.replace(/^\s+/g, '').replace(/\s+$/g, '');
if (searchString == '')
return;
let terms = searchString.split(/\s+/);
this.updateSearchResults(terms);
},
updateSearchResults: function(terms) {
if (!terms)
return;
let isSubSearch = terms.length == this._previousTerms.length;
if (isSubSearch) {
for (let i = 0; i < terms.length; i++) {
if (terms[i].indexOf(this._previousTerms[i]) != 0) {
isSubSearch = false;
break;
}
}
}
let previousResultsArr = this._previousResults;
let results = [];
this._previousTerms = terms;
this._previousResults = results;
if (isSubSearch) {
for (let i = 0; i < this._providers.length; i++) {
let [provider, previousResults] = previousResultsArr[i];
try {
results.push([provider, []]);
provider.getSubsearchResultSet(previousResults, terms);
} catch (error) {
log('A ' + error.name + ' has occured in ' + provider.title + ': ' + error.message);
}
}
} else {
for (let i = 0; i < this._providers.length; i++) {
let provider = this._providers[i];
try {
results.push([provider, []]);
provider.getInitialResultSet(terms);
} catch (error) {
log('A ' + error.name + ' has occured in ' + provider.title + ': ' + error.message);
}
}
}
},
launchSearch: function(provider) {
let terms = this.getTerms();
provider.launchSearch(terms);
Main.overview.toggle();
}
});
Signals.addSignalMethods(SearchSystem.prototype);