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cqfill.js
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cqfill.js
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// src/engine.ts
var Comparator;
(function(Comparator2) {
Comparator2[Comparator2["LESS_THAN"] = 0] = "LESS_THAN";
Comparator2[Comparator2["LESS_OR_EQUAL"] = 1] = "LESS_OR_EQUAL";
Comparator2[Comparator2["GREATER_THAN"] = 2] = "GREATER_THAN";
Comparator2[Comparator2["GREATER_OR_EQUAL"] = 3] = "GREATER_OR_EQUAL";
})(Comparator || (Comparator = {}));
var ContainerConditionType;
(function(ContainerConditionType2) {
ContainerConditionType2[ContainerConditionType2["SizeQuery"] = 0] = "SizeQuery";
ContainerConditionType2[ContainerConditionType2["ContainerConditionConjunction"] = 1] = "ContainerConditionConjunction";
ContainerConditionType2[ContainerConditionType2["ContainerConditionDisjunction"] = 2] = "ContainerConditionDisjunction";
ContainerConditionType2[ContainerConditionType2["ContainerConditionNegation"] = 3] = "ContainerConditionNegation";
})(ContainerConditionType || (ContainerConditionType = {}));
function uid() {
return Array.from({ length: 16 }, () => Math.floor(Math.random() * 256).toString(16)).join("");
}
function translateToLogicalProp(feature) {
switch (feature.toLowerCase()) {
case "inlinesize":
return "inlineSize";
case "blocksize":
return "blockSize";
case "width":
return "inlineSize";
case "height":
return "blockSize";
default:
throw Error(`Unknown feature name ${feature} in container query`);
}
}
function isSizeQueryFulfilled(condition, borderBox) {
const value = borderBox[translateToLogicalProp(condition.feature)];
switch (condition.comparator) {
case 3:
return value >= condition.threshold;
case 2:
return value > condition.threshold;
case 1:
return value <= condition.threshold;
case 0:
return value < condition.threshold;
}
}
function isQueryFullfilled_internal(condition, borderBox) {
switch (condition.type) {
case 1:
return isQueryFullfilled_internal(condition.left, borderBox) && isQueryFullfilled_internal(condition.right, borderBox);
case 2:
return isQueryFullfilled_internal(condition.left, borderBox) || isQueryFullfilled_internal(condition.right, borderBox);
case 3:
return !isQueryFullfilled_internal(condition.right, borderBox);
case 0:
return isSizeQueryFulfilled(condition, borderBox);
default:
throw Error("wtf?");
}
}
function isQueryFullfilled(condition, entry) {
let borderBox;
if ("borderBoxSize" in entry) {
borderBox = entry.borderBoxSize?.[0] ?? entry.borderBoxSize;
} else {
const computed = getComputedStyle(entry.target);
borderBox = {
blockSize: entry.contentRect.height,
inlineSize: entry.contentRect.width
};
borderBox.blockSize += parseInt(computed.paddingBlockStart.slice(0, -2)) + parseInt(computed.paddingBlockEnd.slice(0, -2));
borderBox.inlineSize += parseInt(computed.paddingInlineStart.slice(0, -2)) + parseInt(computed.paddingInlineEnd.slice(0, -2));
}
return isQueryFullfilled_internal(condition, borderBox);
}
function findParentContainer(el, name) {
while (el) {
el = el.parentElement;
if (!containerNames.has(el))
continue;
if (name) {
const containerName = containerNames.get(el);
if (!containerName.includes(name))
continue;
}
return el;
}
return null;
}
var containerNames = new WeakMap();
function registerContainer(el, name) {
containerRO.observe(el);
if (!containerNames.has(el)) {
containerNames.set(el, []);
}
containerNames.get(el).push(name);
}
var queries = [];
function registerContainerQuery(cqd) {
queries.push(cqd);
}
var containerRO = new ResizeObserver((entries) => {
const changedContainers = new Map(entries.map((entry) => [entry.target, entry]));
for (const query of queries) {
for (const { selector } of query.rules) {
const els = document.querySelectorAll(selector);
for (const el of els) {
const container = findParentContainer(el, query.name);
if (!container)
continue;
if (!changedContainers.has(container))
continue;
const entry = changedContainers.get(container);
el.classList.toggle(query.className, isQueryFullfilled(query.condition, entry));
}
}
}
});
var watchedContainerSelectors = [];
var containerMO = new MutationObserver((entries) => {
for (const entry of entries) {
for (const node of entry.removedNodes) {
if (!(node instanceof HTMLElement))
continue;
containerRO.unobserve(node);
}
for (const node of entry.addedNodes) {
if (!(node instanceof HTMLElement))
continue;
for (const watchedContainerSelector of watchedContainerSelectors) {
if (node.matches(watchedContainerSelector.selector)) {
registerContainer(node, watchedContainerSelector.name);
}
for (const container of node.querySelectorAll(watchedContainerSelector.selector)) {
registerContainer(container, watchedContainerSelector.name);
}
}
}
}
});
containerMO.observe(document.documentElement, {
childList: true,
subtree: true
});
function transpileStyleSheet(sheetSrc, srcUrl) {
const p = {
sheetSrc,
index: 0,
name: srcUrl
};
while (p.index < p.sheetSrc.length) {
eatWhitespace(p);
if (p.index >= p.sheetSrc.length)
break;
if (lookAhead("/*", p)) {
while (lookAhead("/*", p)) {
eatComment(p);
eatWhitespace(p);
}
continue;
}
if (lookAhead("@container", p)) {
const { query, startIndex, endIndex } = parseContainerQuery(p);
const replacement = stringifyContainerQuery(query);
replacePart(startIndex, endIndex, replacement, p);
registerContainerQuery(query);
} else {
const rule = parseQualifiedRule(p);
if (!rule)
continue;
handleContainerProps(rule, p);
}
}
if (!srcUrl) {
return p.sheetSrc;
}
p.sheetSrc = p.sheetSrc.replace(/url\(["']*([^)"']+)["']*\)/g, (match, url) => {
return `url(${new URL(url, srcUrl)})`;
});
return p.sheetSrc;
}
function handleContainerProps(rule, p) {
const hasLongHand = rule.block.contents.includes("container-");
const hasShortHand = rule.block.contents.includes("container:");
if (!hasLongHand && !hasShortHand)
return;
let containerName, containerType;
if (hasLongHand) {
containerName = /container-name\s*:([^;}]+)/.exec(rule.block.contents)?.[1].trim();
rule.block.contents = rule.block.contents.replace("container-type", "contain");
}
if (hasShortHand) {
const containerShorthand = /container\s*:([^;}]+)/.exec(rule.block.contents)?.[1];
[containerType, containerName] = containerShorthand.split("/").map((v) => v.trim());
rule.block.contents = rule.block.contents.replace(/container: ([^;}]+)/, `contain: ${containerType};`);
}
if (!containerName) {
containerName = uid();
}
replacePart(rule.block.startIndex, rule.block.endIndex, rule.block.contents, p);
watchedContainerSelectors.push({
name: containerName,
selector: rule.selector
});
for (const el of document.querySelectorAll(rule.selector)) {
registerContainer(el, containerName);
}
}
function replacePart(start, end, replacement, p) {
p.sheetSrc = p.sheetSrc.slice(0, start) + replacement + p.sheetSrc.slice(end);
if (p.index >= end) {
const delta = p.index - end;
p.index = start + replacement.length + delta;
}
}
function eatComment(p) {
assertString(p, "/*");
eatUntil("*/", p);
assertString(p, "*/");
}
function advance(p) {
p.index++;
if (p.index > p.sheetSrc.length) {
throw parseError(p, "Advanced beyond the end");
}
}
function eatUntil(s, p) {
const startIndex = p.index;
while (!lookAhead(s, p)) {
advance(p);
}
return p.sheetSrc.slice(startIndex, p.index);
}
function lookAhead(s, p) {
return p.sheetSrc.substr(p.index, s.length) == s;
}
function parseSelector(p) {
let startIndex = p.index;
eatUntil("{", p);
if (startIndex === p.index) {
throw Error("Empty selector");
}
return p.sheetSrc.slice(startIndex, p.index);
}
function parseQualifiedRule(p) {
const startIndex = p.index;
const selector = parseSelector(p);
if (!selector)
return;
const block = eatBlock(p);
const endIndex = p.index;
return {
selector,
block,
startIndex,
endIndex
};
}
function fileName(p) {
if (p.name) {
return p.name;
}
return "<anonymous file>";
}
function parseError(p, msg) {
return Error(`(${fileName(p)}): ${msg}`);
}
function assertString(p, s) {
if (p.sheetSrc.substr(p.index, s.length) != s) {
throw parseError(p, `Did not find expected sequence ${s}`);
}
p.index += s.length;
}
var whitespaceMatcher = /\s*/g;
function eatWhitespace(p) {
whitespaceMatcher.lastIndex = p.index;
const match = whitespaceMatcher.exec(p.sheetSrc);
if (match) {
p.index += match[0].length;
}
}
function peek(p) {
return p.sheetSrc[p.index];
}
var identMatcher = /[\w\\\@_-]+/g;
function parseIdentifier(p) {
identMatcher.lastIndex = p.index;
const match = identMatcher.exec(p.sheetSrc);
if (!match) {
throw parseError(p, "Expected an identifier");
}
p.index += match[0].length;
return match[0];
}
function parseMeasurementName(p) {
return parseIdentifier(p).toLowerCase();
}
var numberMatcher = /[0-9.]*/g;
function parseThreshold(p) {
numberMatcher.lastIndex = p.index;
const match = numberMatcher.exec(p.sheetSrc);
if (!match) {
throw parseError(p, "Expected a number");
}
p.index += match[0].length;
assertString(p, "px");
const value = parseFloat(match[0]);
if (Number.isNaN(value)) {
throw parseError(p, `${match[0]} is not a valid number`);
}
return value;
}
function eatBlock(p) {
const startIndex = p.index;
assertString(p, "{");
let level = 1;
while (level != 0) {
if (p.sheetSrc[p.index] === "{") {
level++;
} else if (p.sheetSrc[p.index] === "}") {
level--;
}
advance(p);
}
const endIndex = p.index;
const contents = p.sheetSrc.slice(startIndex, endIndex);
return { startIndex, endIndex, contents };
}
function parseLegacySizeQuery(p) {
const measurement = parseMeasurementName(p);
eatWhitespace(p);
assertString(p, ":");
eatWhitespace(p);
const threshold = parseThreshold(p);
eatWhitespace(p);
assertString(p, ")");
eatWhitespace(p);
let comparator;
if (measurement.startsWith("min-")) {
comparator = 3;
} else if (measurement.startsWith("max-")) {
comparator = 1;
} else {
throw Error(`Unknown legacy container query ${measurement}`);
}
return {
type: 0,
feature: translateToLogicalProp(measurement.slice(4)),
comparator,
threshold
};
}
function parseComparator(p) {
if (lookAhead(">=", p)) {
assertString(p, ">=");
return 3;
}
if (lookAhead(">", p)) {
assertString(p, ">");
return 2;
}
if (lookAhead("<=", p)) {
assertString(p, "<=");
return 1;
}
if (lookAhead("<", p)) {
assertString(p, "<");
return 0;
}
throw Error(`Unknown comparator`);
}
function parseSizeQuery(p) {
assertString(p, "(");
if (lookAhead("(", p)) {
const cond = parseContainerCondition(p);
assertString(p, ")");
return cond;
}
eatWhitespace(p);
if (lookAhead("min-", p) || lookAhead("max-", p)) {
return parseLegacySizeQuery(p);
}
const feature = parseIdentifier(p).toLowerCase();
eatWhitespace(p);
const comparator = parseComparator(p);
eatWhitespace(p);
const threshold = parseThreshold(p);
eatWhitespace(p);
assertString(p, ")");
eatWhitespace(p);
return {
type: 0,
feature,
comparator,
threshold
};
}
function parseSizeOrStyleQuery(p) {
eatWhitespace(p);
if (lookAhead("(", p))
return parseSizeQuery(p);
else if (lookAhead("size", p)) {
assertString(p, "size");
eatWhitespace(p);
return parseSizeQuery(p);
} else if (lookAhead("style", p)) {
throw Error(`Style query not implement yet`);
} else {
throw Error(`Unknown container query type`);
}
}
function parseNegatedContainerCondition(p) {
if (lookAhead("not", p)) {
assertString(p, "not");
eatWhitespace(p);
return {
type: 3,
right: parseSizeOrStyleQuery(p)
};
}
return parseSizeOrStyleQuery(p);
}
function parseContainerCondition(p) {
let left = parseNegatedContainerCondition(p);
while (true) {
if (lookAhead("and", p)) {
assertString(p, "and");
eatWhitespace(p);
const right = parseNegatedContainerCondition(p);
eatWhitespace(p);
left = {
type: 1,
left,
right
};
} else if (lookAhead("or", p)) {
assertString(p, "or");
eatWhitespace(p);
const right = parseNegatedContainerCondition(p);
eatWhitespace(p);
left = {
type: 2,
left,
right
};
} else {
break;
}
}
return left;
}
function parseContainerQuery(p) {
const startIndex = p.index;
assertString(p, "@container");
eatWhitespace(p);
let name = "";
if (peek(p) !== "(" && !lookAhead("size", p) && !lookAhead("style", p)) {
name = parseIdentifier(p);
eatWhitespace(p);
}
const condition = parseContainerCondition(p);
eatWhitespace(p);
assertString(p, "{");
eatWhitespace(p);
const rules = [];
while (peek(p) !== "}") {
rules.push(parseQualifiedRule(p));
eatWhitespace(p);
}
assertString(p, "}");
const endIndex = p.index;
eatWhitespace(p);
const className = `cq_${uid()}`;
return {
query: {
condition,
className,
name,
rules
},
startIndex,
endIndex
};
}
function stringifyContainerQuery(query) {
return query.rules.map((rule) => `:is(${rule.selector}).${query.className} ${rule.block.contents}`).join("\n");
}
// src/cqfill.ts
function init() {
const supportsContainerQueries = "container" in document.documentElement.style;
if (supportsContainerQueries)
return false;
const sheetObserver = new MutationObserver((entries) => {
for (const entry of entries) {
for (const addedNode of entry.addedNodes) {
if (addedNode instanceof HTMLStyleElement) {
handleStyleTag(addedNode);
}
if (addedNode instanceof HTMLLinkElement) {
handleLinkedStylesheet(addedNode);
}
}
}
});
sheetObserver.observe(document.documentElement, {
childList: true,
subtree: true
});
function handleStyleTag(el) {
if (el.innerHTML.trim().length === 0)
return;
const newSrc = transpileStyleSheet(el.innerHTML);
el.innerHTML = newSrc;
}
async function handleLinkedStylesheet(el) {
if (el.rel !== "stylesheet")
return;
const srcUrl = new URL(el.href, document.baseURI);
if (srcUrl.origin !== location.origin)
return;
const src = await fetch(srcUrl.toString()).then((r) => r.text());
const newSrc = transpileStyleSheet(src, srcUrl.toString());
const blob = new Blob([newSrc], { type: "text/css" });
el.href = URL.createObjectURL(blob);
}
document.querySelectorAll("style").forEach((tag) => handleStyleTag(tag));
document.querySelectorAll("link").forEach((tag) => handleLinkedStylesheet(tag));
}
export {
init,
transpileStyleSheet
};