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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Custom bindings for the omnibox API. Only injected into the v8 contexts
// for extensions which have permission for the omnibox API.
var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
var sendRequest = require('sendRequest').sendRequest;
// Remove invalid characters from |text| so that it is suitable to use
// for |AutocompleteMatch::contents|.
function sanitizeString(text, shouldTrim) {
// NOTE: This logic mirrors |AutocompleteMatch::SanitizeString()|.
// 0x2028 = line separator; 0x2029 = paragraph separator.
var kRemoveChars = /(\r|\n|\t|\u2028|\u2029)/gm;
if (shouldTrim)
text = text.trimLeft();
return text.replace(kRemoveChars, '');
}
// Parses the xml syntax supported by omnibox suggestion results. Returns an
// object with two properties: 'description', which is just the text content,
// and 'descriptionStyles', which is an array of style objects in a format
// understood by the C++ backend.
function parseOmniboxDescription(input) {
var domParser = new DOMParser();
// The XML parser requires a single top-level element, but we want to
// support things like 'hello, <match>world</match>!'. So we wrap the
// provided text in generated root level element.
var root = domParser.parseFromString(
'<fragment>' + input + '</fragment>', 'text/xml');
// DOMParser has a terrible error reporting facility. Errors come out nested
// inside the returned document.
var error = root.querySelector('parsererror div');
if (error) {
throw new Error(error.textContent);
}
// Otherwise, it's valid, so build up the result.
var result = {
description: '',
descriptionStyles: []
};
// Recursively walk the tree.
function walk(node) {
for (var i = 0, child; child = node.childNodes[i]; i++) {
// Append text nodes to our description.
if (child.nodeType == Node.TEXT_NODE) {
var shouldTrim = result.description.length == 0;
result.description += sanitizeString(child.nodeValue, shouldTrim);
continue;
}
// Process and descend into a subset of recognized tags.
if (child.nodeType == Node.ELEMENT_NODE &&
(child.nodeName == 'dim' || child.nodeName == 'match' ||
child.nodeName == 'url')) {
var style = {
'type': child.nodeName,
'offset': result.description.length
};
result.descriptionStyles.push(style);
walk(child);
style.length = result.description.length - style.offset;
continue;
}
// Descend into all other nodes, even if they are unrecognized, for
// forward compat.
walk(child);
}
};
walk(root);
return result;
}
chromeHidden.registerCustomHook('omnibox', function(bindingsAPI) {
var apiFunctions = bindingsAPI.apiFunctions;
apiFunctions.setHandleRequest('setDefaultSuggestion', function(details) {
var parseResult = parseOmniboxDescription(details.description);
sendRequest(this.name, [parseResult], this.definition.parameters);
});
apiFunctions.setUpdateArgumentsPostValidate(
'sendSuggestions', function(requestId, userSuggestions) {
var suggestions = [];
for (var i = 0; i < userSuggestions.length; i++) {
var parseResult = parseOmniboxDescription(
userSuggestions[i].description);
parseResult.content = userSuggestions[i].content;
suggestions.push(parseResult);
}
return [requestId, suggestions];
});
});
chromeHidden.Event.registerArgumentMassager('omnibox.onInputChanged',
function(args, dispatch) {
var text = args[0];
var requestId = args[1];
var suggestCallback = function(suggestions) {
chrome.omnibox.sendSuggestions(requestId, suggestions);
};
dispatch([text, suggestCallback]);
});
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