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Move Add-on SDK source to toolkit/jetpack

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NTD 2018-02-09 06:46:43 -05:00 • committed by Roy Tam
commit 23b67db438
993 changed files with 484 additions and 100663 deletions
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215
addon-sdk/source/lib/framescript/context-menu.js
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const { query, constant, cache } = require("sdk/lang/functional");
const { pairs, each, map, object } = require("sdk/util/sequence");
const { nodeToMessageManager } = require("./util");
// Decorator function that takes `f` function and returns one that attempts
// to run `f` with given arguments. In case of exception error is logged
// and `fallback` is returned instead.
const Try = (fn, fallback=null) => (...args) => {
try {
return fn(...args);
} catch(error) {
console.error(error);
return fallback;
}
};
// Decorator funciton that takes `f` function and returns one that returns
// JSON cloned result of whatever `f` returns for given arguments.
const JSONReturn = f => (...args) => JSON.parse(JSON.stringify(f(...args)));
const Null = constant(null);
// Table of readers mapped to field names they're going to be reading.
const readers = Object.create(null);
// Read function takes "contextmenu" event target `node` and returns table of
// read field names mapped to appropriate values. Read uses above defined read
// table to read data for all registered readers.
const read = node =>
object(...map(([id, read]) => [id, read(node, id)], pairs(readers)));
// Table of built-in readers, each takes a descriptor and returns a reader:
// descriptor -> node -> JSON
const parsers = Object.create(null)
// Function takes a descriptor of the remotely defined reader and parsese it
// to construct a local reader that's going to read out data from context menu
// target.
const parse = descriptor => {
const parser = parsers[descriptor.category];
if (!parser) {
console.error("Unknown reader descriptor was received", descriptor, `"${descriptor.category}"`);
return Null
}
return Try(parser(descriptor));
}
// TODO: Test how chrome's mediaType behaves to try and match it's behavior.
const HTML_NS = "http://www.w3.org/1999/xhtml";
const XUL_NS = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
const SVG_NS = "http://www.w3.org/2000/svg";
// Firefox always creates a HTMLVideoElement when loading an ogg file
// directly. If the media is actually audio, be smarter and provide a
// context menu with audio operations.
// Source: https://github.com/mozilla/gecko-dev/blob/28c2fca3753c5371643843fc2f2f205146b083b7/browser/base/content/nsContextMenu.js#L632-L637
const isVideoLoadingAudio = node =>
node.readyState >= node.HAVE_METADATA &&
(node.videoWidth == 0 || node.videoHeight == 0)
const isVideo = node =>
node instanceof node.ownerDocument.defaultView.HTMLVideoElement &&
!isVideoLoadingAudio(node);
const isAudio = node => {
const {HTMLVideoElement, HTMLAudioElement} = node.ownerDocument.defaultView;
return node instanceof HTMLAudioElement ? true :
node instanceof HTMLVideoElement ? isVideoLoadingAudio(node) :
false;
};
const isImage = ({namespaceURI, localName}) =>
namespaceURI === HTML_NS && localName === "img" ? true :
namespaceURI === XUL_NS && localName === "image" ? true :
namespaceURI === SVG_NS && localName === "image" ? true :
false;
parsers["reader/MediaType()"] = constant(node =>
isImage(node) ? "image" :
isAudio(node) ? "audio" :
isVideo(node) ? "video" :
null);
const readLink = node =>
node.namespaceURI === HTML_NS && node.localName === "a" ? node.href :
readLink(node.parentNode);
parsers["reader/LinkURL()"] = constant(node =>
node.matches("a, a *") ? readLink(node) : null);
// Reader that reads out `true` if "contextmenu" `event.target` matches
// `descriptor.selector` and `false` if it does not.
parsers["reader/SelectorMatch()"] = ({selector}) =>
node => node.matches(selector);
// Accessing `selectionStart` and `selectionEnd` properties on non
// editable input nodes throw exceptions, there for we need this util
// function to guard us against them.
const getInputSelection = node => {
try {
if ("selectionStart" in node && "selectionEnd" in node) {
const {selectionStart, selectionEnd} = node;
return {selectionStart, selectionEnd}
}
}
catch(_) {}
return null;
}
// Selection reader does not really cares about descriptor so it is
// a constant function returning selection reader. Selection reader
// returns string of the selected text or `null` if there is no selection.
parsers["reader/Selection()"] = constant(node => {
const selection = node.ownerDocument.getSelection();
if (!selection.isCollapsed) {
return selection.toString();
}
// If target node is editable (text, input, textarea, etc..) document does
// not really handles selections there. There for we fallback to checking
// `selectionStart` `selectionEnd` properties and if they are present we
// extract selections manually from the `node.value`.
else {
const selection = getInputSelection(node);
const isSelected = selection &&
Number.isInteger(selection.selectionStart) &&
Number.isInteger(selection.selectionEnd) &&
selection.selectionStart !== selection.selectionEnd;
return isSelected ? node.value.substring(selection.selectionStart,
selection.selectionEnd) :
null;
}
});
// Query reader just reads out properties from the node, so we just use `query`
// utility function.
parsers["reader/Query()"] = ({path}) => JSONReturn(query(path));
// Attribute reader just reads attribute of the event target node.
parsers["reader/Attribute()"] = ({name}) => node => node.getAttribute(name);
// Extractor reader defines generates a reader out of serialized function, who's
// return value is JSON cloned. Note: We do know source will evaluate to function
// as that's what we serialized on the other end, it's also ok if generated function
// is going to throw as registered readers are wrapped in try catch to avoid breakting
// unrelated readers.
parsers["reader/Extractor()"] = ({source}) =>
JSONReturn(new Function("return (" + source + ")")());
// If the context-menu target node or any of its ancestors is one of these,
// Firefox uses a tailored context menu, and so the page context doesn't apply.
// There for `reader/isPage()` will read `false` in that case otherwise it's going
// to read `true`.
const nonPageElements = ["a", "applet", "area", "button", "canvas", "object",
"embed", "img", "input", "map", "video", "audio", "menu",
"option", "select", "textarea", "[contenteditable=true]"];
const nonPageSelector = nonPageElements.
concat(nonPageElements.map(tag => `${tag} *`)).
join(", ");
// Note: isPageContext implementation could have actually used SelectorMatch reader,
// but old implementation was also checked for collapsed selection there for to keep
// the behavior same we end up implementing a new reader.
parsers["reader/isPage()"] = constant(node =>
node.ownerDocument.defaultView.getSelection().isCollapsed &&
!node.matches(nonPageSelector));
// Reads `true` if node is in an iframe otherwise returns true.
parsers["reader/isFrame()"] = constant(node =>
!!node.ownerDocument.defaultView.frameElement);
parsers["reader/isEditable()"] = constant(node => {
const selection = getInputSelection(node);
return selection ? !node.readOnly && !node.disabled : node.isContentEditable;
});
// TODO: Add some reader to read out tab id.
const onReadersUpdate = message => {
each(([id, descriptor]) => {
if (descriptor) {
readers[id] = parse(descriptor);
}
else {
delete readers[id];
}
}, pairs(message.data));
};
exports.onReadersUpdate = onReadersUpdate;
const onContextMenu = event => {
if (!event.defaultPrevented) {
const manager = nodeToMessageManager(event.target);
manager.sendSyncMessage("sdk/context-menu/read", read(event.target), readers);
}
};
exports.onContextMenu = onContextMenu;
const onContentFrame = (frame) => {
// Listen for contextmenu events in on this frame.
frame.addEventListener("contextmenu", onContextMenu);
// Listen to registered reader changes and update registry.
frame.addMessageListener("sdk/context-menu/readers", onReadersUpdate);
// Request table of readers (if this is loaded in a new process some table
// changes may be missed, this is way to sync up).
frame.sendAsyncMessage("sdk/context-menu/readers?");
};
exports.onContentFrame = onContentFrame;