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/**
* PostCSS plugin to toggle viewport units into container query units.
*
* This plugin processes CSS rules and media queries to add container query versions
* alongside the existing viewport versions. It includes support for:
* - Converting `position: fixed` to `position: sticky` in container contexts.
* - Handling nested media queries.
* - Adding container query contexts when required.
*
* @param {Object} opts - Plugin options.
* @param {Object} [opts.units] - A mapping of viewport units to container query units.
* @param {string} [opts.containerEl='body'] - The container element selector.
* @param {string} [opts.modifierAttr='data-breakpoint-preview-mode']
* - The attribute for container queries.
* @param {Function} [opts.transform] - A custom function to transform
* media queries when creating container queries.
* @param {boolean} [opts.debug=false] - Enables debug logging.
* @param {string} [opts.debugFilter] - A filter string for limiting debug
* logs to specific files.
* @returns {Object} The PostCSS plugin.
*/
const { DEFAULT_OPTIONS } = require('./src/constants/defaults');
const createUnitConverter = require('./src/utils/unitConverter');
const createMediaProcessor = require('./src/utils/mediaProcessor');
const createRuleProcessor = require('./src/utils/ruleProcessor');
const createDebugUtils = require('./src/utils/debug');
const createSelectorHelper = require('./src/utils/selectorHelper');
const plugin = (opts = {}) => {
// Merge options with defaults
const options = {
...DEFAULT_OPTIONS,
...opts
};
const { containerEl, modifierAttr } = options;
// Create selectors
const conditionalSelector = `${containerEl}[${modifierAttr}]`;
const conditionalNotSelector = `${containerEl}:not([${modifierAttr}])`;
const containerBodySelector = '[data-apos-refreshable-body]';
// Create utility instances
const unitConverter = createUnitConverter({ units: options.units });
const debugUtils = createDebugUtils(options);
const mediaProcessor = createMediaProcessor({
...options
});
const ruleProcessor = createRuleProcessor({
...options,
unitConverter
});
const selectorHelper = createSelectorHelper({ modifierAttr });
// Track processed nodes to avoid duplicates
const processed = Symbol('processed');
// Flag to track if container context like sticky has been added
let hasAddedContainerContext = false;
const isSameMediaQuery = (mq1, mq2) => {
return mq1.params === mq2.params &&
mq1.source?.start?.line === mq2.source?.start?.line;
};
/**
* Adds a container context with `position: relative` and `contain: layout` if required.
*
* @param {Object} root - The PostCSS root node.
* @param {Object} helpers - PostCSS helpers, including the `Rule` constructor.
*/
const addContainerContextIfNeeded = (root, helpers) => {
if (hasAddedContainerContext) {
return;
}
let needsContainerContext = false;
root.walkDecls('position', decl => {
if (decl.value === 'fixed') {
needsContainerContext = true;
return false;
}
});
if (needsContainerContext) {
debugUtils.stats.fixedPositionsConverted++;
const contextRule = new helpers.Rule({
selector: conditionalSelector,
source: root.source,
from: helpers.result.opts.from
});
contextRule.append({
prop: 'position',
value: 'relative',
source: root.source,
from: helpers.result.opts.from
});
contextRule.append({
prop: 'contain',
value: 'layout',
source: root.source,
from: helpers.result.opts.from
});
root.prepend(contextRule);
hasAddedContainerContext = true;
}
};
return {
postcssPlugin: 'postcss-viewport-to-container-toggle',
Once(root, helpers) {
addContainerContextIfNeeded(root, helpers);
},
Rule(rule, helpers) {
// Skip already processed rules
if (rule[processed]) {
return;
}
// Skip rules inside media queries - these will be handled by AtRule
// as well as the ones inside container queries (already processed or from css)
if (
rule.parent?.type === 'atrule' &&
[ 'media', 'container' ].includes(rule.parent?.name)
) {
return;
}
// Do not treat cloned rules already handled
if (
rule.selector.includes(conditionalNotSelector) ||
rule.selector.includes(containerBodySelector) ||
rule.selector.includes(conditionalSelector)
) {
return;
}
// Process rule if it needs conversion
if (ruleProcessor.needsProcessing(rule)) {
debugUtils.stats.rulesProcessed++;
debugUtils.log(`Processing rule: ${rule.selector}`, rule);
// Create container version with converted units
// should target [data-apos-refreshable-body]
const containerRule = rule.clone({
source: rule.source,
from: helpers.result.opts.from,
selector: selectorHelper.addTargetToSelectors(
rule.selector,
containerBodySelector
)
});
rule.selector = selectorHelper.updateBodySelectors(
rule.selector,
[ conditionalNotSelector ]
);
ruleProcessor.processDeclarations(containerRule, {
isContainer: true,
from: helpers.result.opts.from
});
// Add container rule after original
rule.after('\n' + containerRule);
} else {
rule.selector = selectorHelper.updateBodySelectors(
rule.selector,
[ conditionalNotSelector, containerBodySelector ]
);
}
rule[processed] = true;
},
AtRule: {
media(atRule, helpers) {
debugUtils.logMediaQuery(atRule, 'START');
if (atRule[processed]) {
debugUtils.log('Skipping already processed media query', atRule);
return;
}
// Check if this media query is nested inside a rule
const isNested = atRule.parent?.type === 'rule';
debugUtils.log(`Media query is ${isNested ? 'NESTED' : 'TOP-LEVEL'}`, atRule);
let hasNotSelector = false;
atRule.walkRules(rule => {
if (rule.selector.includes(conditionalNotSelector)) {
hasNotSelector = true;
}
});
if (hasNotSelector) {
debugUtils.log('Skipping - already has not selector', atRule);
atRule[processed] = true;
return;
}
const conditions = mediaProcessor.getMediaConditions(atRule);
debugUtils.log(`Extracted conditions: ${JSON.stringify(conditions)}`, atRule);
if (conditions.length > 0) {
debugUtils.stats.mediaQueriesProcessed++;
const containerConditions =
mediaProcessor.convertToContainerConditions(conditions);
debugUtils.log(`Container conditions: ${containerConditions}`, atRule);
if (containerConditions) {
debugUtils.log('Creating container query...', atRule);
const containerQuery = new helpers.AtRule({
name: 'container',
params: containerConditions,
source: atRule.source,
from: helpers.result.opts.from
});
// For nested media queries
if (isNested) {
debugUtils.log('Processing nested media query declarations...', atRule);
atRule.each(node => {
if (node.type === 'decl') {
debugUtils.log(` Processing declaration: ${node.prop}: ${node.value}`, atRule);
const containerDecl = node.clone({
source: node.source,
from: helpers.result.opts.from
});
// Convert viewport units if needed
let value = containerDecl.value;
if (Object.keys(unitConverter.units)
.some(unit => value.includes(unit))) {
value = unitConverter.convertUnitsInExpression(value);
containerDecl.value = value;
debugUtils.log(` Converted value to: ${value}`, atRule);
}
containerQuery.append(containerDecl);
}
});
debugUtils.log(` Total declarations in container query: ${containerQuery.nodes?.length || 0}`, atRule);
const parentRule = atRule.parent;
// Find the root nesting level
let rootParent = parentRule;
let isSingleLevel = true;
while (rootParent.parent && rootParent.parent.type === 'rule') {
rootParent = rootParent.parent;
isSingleLevel = false;
}
// For single-level nesting (Tailwind case), use simple approach
if (isSingleLevel) {
// Add container query inside the parent rule, after the media query
atRule.after(containerQuery);
const originalSelector = parentRule.selector;
let conditionalRule = null;
let alreadyHasWrapper = false;
let prevNode = parentRule.prev();
const targetSelector = selectorHelper
.addTargetToSelectors(
originalSelector,
conditionalNotSelector
);
while (prevNode) {
if (prevNode.type === 'rule' && prevNode.selector === targetSelector) {
conditionalRule = prevNode;
alreadyHasWrapper = true;
debugUtils.log('Found existing conditional wrapper, reusing it', atRule);
break;
}
prevNode = prevNode.prev();
}
if (!alreadyHasWrapper) {
conditionalRule = new helpers.Rule({
selector: targetSelector,
source: parentRule.source,
from: helpers.result.opts.from
});
parentRule.before(conditionalRule);
debugUtils.log('Created new conditional wrapper', atRule);
}
const clonedMedia = atRule.clone();
clonedMedia[processed] = true;
conditionalRule.append(clonedMedia);
atRule.remove();
debugUtils.log('Added conditional wrapper for nested media query', atRule);
} else {
// Multi-level nesting - hoist to root with full structure
const rootSelector = rootParent.selector;
// Check if wrapper exists at root level
let conditionalRule = null;
let alreadyHasWrapper = false;
let prevNode = rootParent.prev();
const targetSelector = selectorHelper
.addTargetToSelectors(
rootSelector,
conditionalNotSelector
);
while (prevNode) {
if (prevNode.type === 'rule' && prevNode.selector === targetSelector) {
conditionalRule = prevNode;
alreadyHasWrapper = true;
debugUtils.log('Found existing conditional wrapper, reusing it', atRule);
break;
}
prevNode = prevNode.prev();
}
if (!alreadyHasWrapper) {
// Create wrapper with full nested structure
conditionalRule = new helpers.Rule({
selector: targetSelector,
source: rootParent.source,
from: helpers.result.opts.from
});
// Clone children of root parent (before container query is added)
rootParent.each(node => {
const clonedNode = node.clone();
// Remove media queries that are NOT the current one being processed
clonedNode.walkAtRules('media', (mediaRule) => {
// Keep the current media query we're processing, remove others
if (mediaRule !== atRule && !isSameMediaQuery(mediaRule, atRule)) {
mediaRule.remove();
} else {
mediaRule[processed] = true;
}
});
// If this node itself is a media query
// and not the one we're processing, skip it
if (clonedNode.type === 'atrule' && clonedNode.name === 'media') {
if (!isSameMediaQuery(clonedNode, atRule)) {
return; // Skip appending
}
clonedNode[processed] = true;
}
conditionalRule.append(clonedNode);
});
rootParent.before(conditionalRule);
debugUtils.log('Created new conditional wrapper at root level', atRule);
} else {
// Wrapper exists, add media query to matching nested location
const targetInWrapper = conditionalRule.first;
if (targetInWrapper && targetInWrapper.type === 'rule') {
// Build path from parentRule to rootParent
const pathSelectors = [];
let current = parentRule;
while (current !== rootParent) {
pathSelectors.unshift(current.selector);
current = current.parent;
}
// Navigate to matching location in wrapper
let navNode = targetInWrapper;
for (const selector of pathSelectors) {
let found = false;
navNode.each(node => {
if (node.type === 'rule' && node.selector === selector) {
navNode = node;
found = true;
return false;
}
});
if (!found) {
break;
}
}
// Add cloned media to correct location
const clonedMedia = atRule.clone();
clonedMedia[processed] = true;
navNode.append(clonedMedia);
}
}
// Remove from original
atRule.remove();
// Now add container query to original (after cloning)
parentRule.append(containerQuery);
debugUtils.log('Added conditional wrapper for nested media query', atRule);
}
} else {
// Original logic for top-level media queries
atRule.walkRules(rule => {
const containerRule = rule.clone({
source: rule.source,
from: helpers.result.opts.from,
selector: selectorHelper.updateBodySelectors(
rule.selector,
[ containerBodySelector ]
)
});
ruleProcessor.processDeclarations(containerRule, {
isContainer: true,
from: helpers.result.opts.from
});
containerRule.raws.before = '\n ';
containerRule.raws.after = '\n ';
containerRule.walkDecls(decl => {
decl.raws.before = '\n ';
});
containerQuery.append(containerRule);
});
// Add container query
atRule.after(containerQuery);
}
}
// Now handle viewport media query modifications
// We want the original media query to get the not selector
if (!isNested) {
atRule.walkRules(rule => {
// Skip if already modified with not selector
if (rule.selector.includes(conditionalNotSelector)) {
return;
}
const viewportRule = rule.clone({
source: rule.source,
from: helpers.result.opts.from
});
viewportRule.selector = selectorHelper.addTargetToSelectors(
rule.selector,
conditionalNotSelector
);
rule.replaceWith(viewportRule);
});
}
} else {
debugUtils.log('No conditions found - skipping', atRule);
}
// Only mark the atRule as processed after all transformations
atRule[processed] = true;
debugUtils.logMediaQuery(atRule, 'END');
}
},
OnceExit() {
debugUtils.printSummary();
}
};
};
plugin.postcss = true;
module.exports = plugin;