common.js

const UNIQUE_ID_FOR_OUR_BOOKMARKLETS = 'd68c02e08c00';

/* These CSS class names exist to handle these situations: 
1) when bookmarklet X is run two or more times.
2) when bookmarklet X is run then a different bookmarklet Y is run. 

These CSS classes are not used for styling and they never exist.  We are using 
the "class=" attribute here as a kind of "group ID", to keep track of which 
elements our bookmarklets have added to the DOM, so that we can remove them 
later.  

Situation #2 is harder than situation #1.  In general, the bookmarklets add to 
each other, so you'll see eg. all the images annotations and also all of the 
ARIA annotations.  But then some of the bookmarklets have overlapping 
functionality eg. "images" and "ARIA" both add an annotation for 
"aria-labelledby".  eg. if we run 1) X, then 2) run X again, then 3) run Y: 
the second run of X will first remove all* of the annotations that the first run of X 
added, then re-add it's annotations specific to X.  then the run of Y will 
first remove some of the annotations that X added, then add its own 
annotations specific to Y.

[* not all.  almost all.  see below.]

This is complicated further by these facts:
- sometimes the second run of X doesn't remove everything that it added.  
eg. in "images" (at the time of writing) it adds some "inputSpan" annotations 
and doesn't remove them.  so on second and subsequent runs, it will keep re-adding 
duplicates of these annotations indefinitely.  
- the annotations that they have in common might be almost 
identical, but not quite.  eg. for "images" and "ARIA", their "aria-labelledby" 
annotations use different colors). 
- sometimes Y will remove what X added, and not add any equivalent back.  
eg. "ARIA" removes "images"' "NO ID MATCH" annotation.

At the time of writing I don't know how much of this behaviour was intentional 
by the original author(s), or is desirable now.  And I'm not trying to know.  
Instead, my goals are:
- preserve the original behaviour amidst our new build process - whether that 
behaviour is (as in the example above) "ARIA" removing the annotations that 
were added by "images", or mangling them, or adding useless duplicates for 
them. 
- make these CSS class names unique so that we'll never collide with names that 
are used by the target web page.  
*/

const CSS_CLASS_GENERAL = `class_${UNIQUE_ID_FOR_OUR_BOOKMARKLETS}_general`;

/* These are legacy.  I don't know why there's several of them instead of just one. */
const CSS_CLASS_ALTSPAN = `class_${UNIQUE_ID_FOR_OUR_BOOKMARKLETS}_altSpan`;
const CSS_CLASS_AXSPAN = `class_${UNIQUE_ID_FOR_OUR_BOOKMARKLETS}_axSpan`;
const CSS_CLASS_OPENSPAN = `class_${UNIQUE_ID_FOR_OUR_BOOKMARKLETS}_openSpan`;
const CSS_CLASS_CLOSESPAN = `class_${UNIQUE_ID_FOR_OUR_BOOKMARKLETS}_closeSpan`;
const CSS_CLASS_INPUTSPAN = `class_${UNIQUE_ID_FOR_OUR_BOOKMARKLETS}_inputSpan`;

function areWeInAnIframe() {
	return window.self !== window.top;
}

function showMsg(foundAnyElems_, nouns_) {
	let msg = foundAnyElems_ 
		? `Success: one or more ${nouns_} were found on this page` 
		: `No ${nouns_} were found on this page`;
	let newMsgElem = $(`<strong class="${CSS_CLASS_GENERAL}" role="alert" 
		style="color:black;font-weight:bold;font-family:sans-serif;font-size:small;background-color:yellow;margin:0 2px; padding:2px; position: fixed; top: 0; 
		z-index: 9999999" role="status">${msg}</strong>`);
	/* ^^ the CSS class is there to handle a second bookmarklet run when the message (added by this 
	function) from the first bookmarklet run is still in the DOM.  it prevents us from adding 
	an annotation to this, our message element. */
	$('body').prepend(newMsgElem);
	let delayInMilliseconds = 6000; 
	setTimeout(() => { newMsgElem.remove(); }, delayInMilliseconds);
}

function getRootNodesForQuerySelector() {
	let r = [document.body];

	function findShadowRoots(node__) {
		if (node__.shadowRoot) {
			r.push(node__.shadowRoot);
		}
		for (const childNode of node__.childNodes) {
			if (childNode.nodeType === Node.ELEMENT_NODE) {
				findShadowRoots(childNode);
			}
		}
	}
	findShadowRoots(document.body);

	for (let iframe of document.body.querySelectorAll('iframe')) {
		if (!iframe.contentDocument) continue; /* cross-origin iframe.  nothing we can do. */
		r.push(iframe.contentDocument);
	}
	return r;
}


function runBookmarkletMainFunctionWhenAppropriate(mainFunc_) {

	if(areWeInAnIframe()) {
		/* This will only happen if we're running inside of tampermonkey, I think.  
		maybe one day our users will run this code inside of tampermonkey.    
		but right now, it's only developers of this code that are running it inside of tampermonkey, 
		to speed up testing.  
		so I don't want to deal with the complications.  right now, since our real users are 
		running this code as a bookmarklet (not through tampermonkey), we need to deal with iframes 
		from the top-level context (which is all that the bookmarklet has access to) 
		or not at all.  */
		return;
	}

	logBuildTimestamp();

	if(document.readyState === "complete") {
		/* This will happen, probably, if this code is running as a bookmarklet. */
		mainFunc_();
	} else {
		/* This will happen (definitely, I think) if this code is running as a 
		tampermonkey script via "@require". */ 
		document.addEventListener("readystatechange", (event__) => {
			if(document.readyState === "complete") {
				/* We could call run() right now, and that would work most of the time.
				But not in this case: at least one of my test pages builds some shadow DOM with JS 
				in a window.addEventListener("load", ...) listener.  So that shadow DOM doesn't 
				exist yet, I think.  So this setTimeout() is a hack so that run() will 
				probably be called after that "load" listener which builds the shadow DOM. */
				setTimeout(mainFunc_, 1000);
			}
		});
	}

}

function logBuildTimestamp() {
	let buildTimestamp = "__BUILD_TIMESTAMP_IN_EPOCH_MILLIS__";
	buildTimestamp = parseInt(buildTimestamp, 10);
	let buildTimeAgoInMillis = Date.now() - buildTimestamp;
	let buildTimeAgoInSeconds = Math.round(buildTimeAgoInMillis/1000);
	console.log(new Date(), `Built ${buildTimeAgoInSeconds} second(s) ago.`);
}

/* here we inline the 'zepto' library.  zepto is a small jquery replacement. 
from https://zeptojs.com/zepto.min.js 
downloaded ~ 2023-11-21.  v1.2.0 of zepto.  
I'm using zepto (~ 26K) instead of jquery (~ 89K) because when I inlined jquery like this 
it seemed to cause a blocking problem:  my edits to the bookmarklet seemed to silently fail 
in firefox. */

/* Zepto v1.2.0 - zepto event ajax form ie - zeptojs.com/license */
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