91be31b648
This makes waiting for text robust. script.addPreloadScript() doesn't export the declared functions, so we need to attach them to `window`. We also don't need all of them.
75 lines
2.4 KiB
JavaScript
75 lines
2.4 KiB
JavaScript
window.ph_select = function(sel) {
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if (!window.Sizzle) {
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return Array.from(document.querySelectorAll(sel));
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}
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if (sel.includes(":contains(")) {
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if (!window.Sizzle) {
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throw new Error("Using ':contains' when window.Sizzle is not available.");
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}
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return window.Sizzle(sel);
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} else {
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return Array.from(document.querySelectorAll(sel));
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}
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};
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window.ph_find = function(sel) {
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const els = window.ph_select(sel);
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if (els.length === 0)
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throw new Error(sel + " not found");
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if (els.length > 1)
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throw new Error(sel + " is ambiguous");
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return els[0];
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};
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window.ph_text = function(sel) {
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const el = window.ph_find(sel);
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if (el.textContent === undefined)
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throw new Error(sel + " can not have text");
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// 0xa0 is a non-breakable space, which is a rendering detail of Chromium
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// and awkward to handle in tests; turn it into normal spaces
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return el.textContent.replaceAll("\xa0", " ");
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};
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window.ph_is_visible = function(sel) {
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const el = window.ph_find(sel);
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return el.tagName === "svg" || ((el.offsetWidth > 0 || el.offsetHeight > 0) && !(el.style.visibility === "hidden" || el.style.display === "none"));
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};
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class PhWaitCondTimeout extends Error {
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constructor(description) {
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if (description && description.apply)
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description = description.apply();
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if (description)
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super(description);
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else
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super("condition did not become true");
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}
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}
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window.ph_wait_cond = function (cond, timeout, error_description) {
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return new Promise((resolve, reject) => {
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// poll every 100 ms for now; FIXME: poll less often and re-check on mutations using
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// https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver
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let stepTimer = null;
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let last_err = null;
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const tm = window.setTimeout(() => {
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if (stepTimer)
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window.clearTimeout(stepTimer);
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reject(last_err || new PhWaitCondTimeout(error_description));
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}, timeout);
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function step() {
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try {
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if (cond()) {
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window.clearTimeout(tm);
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resolve();
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return;
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}
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} catch (err) {
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last_err = err;
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}
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stepTimer = window.setTimeout(step, 100);
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}
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step();
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});
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};
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