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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _browserslist = _interopRequireDefault(require("browserslist"));
var _cssnanoUtils = require("cssnano-utils");
var _ensureCompatibility = require("./lib/ensureCompatibility");
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
/**
* @param {postcss.Declaration} a
* @param {postcss.Declaration} b
* @return {boolean}
*/
function declarationIsEqual(a, b) {
return a.important === b.important && a.prop === b.prop && a.value === b.value;
}
/**
* @param {postcss.Declaration[]} array
* @param {postcss.Declaration} decl
* @return {number}
*/
function indexOfDeclaration(array, decl) {
return array.findIndex(d => declarationIsEqual(d, decl));
}
/**
* Returns filtered array of matched or unmatched declarations
* @param {postcss.Declaration[]} a
* @param {postcss.Declaration[]} b
* @param {boolean} [not=false]
* @return {postcss.Declaration[]}
*/
function intersect(a, b, not) {
return a.filter(c => {
const index = ~indexOfDeclaration(b, c);
return not ? !index : index;
});
}
/**
* @param {postcss.Declaration[]} a
* @param {postcss.Declaration[]} b
* @return {boolean}
*/
function sameDeclarationsAndOrder(a, b) {
if (a.length !== b.length) {
return false;
}
return a.every((d, index) => declarationIsEqual(d, b[index]));
}
/**
* @param {postcss.Rule} ruleA
* @param {postcss.Rule} ruleB
* @param {string[]=} browsers
* @param {Object.<string, boolean>=} compatibilityCache
* @return {boolean}
*/
function canMerge(ruleA, ruleB, browsers, compatibilityCache) {
const a = ruleA.selectors;
const b = ruleB.selectors;
const selectors = a.concat(b);
if (!(0, _ensureCompatibility.ensureCompatibility)(selectors, browsers, compatibilityCache)) {
return false;
}
const parent = (0, _cssnanoUtils.sameParent)(ruleA, ruleB);
const {
name
} = ruleA.parent;
if (parent && name && ~name.indexOf('keyframes')) {
return false;
}
return parent && (selectors.every(_ensureCompatibility.noVendor) || (0, _ensureCompatibility.sameVendor)(a, b));
}
/**
* @param {postcss.Rule} rule
* @return {postcss.Declaration[]}
*/
function getDecls(rule) {
return rule.nodes.filter(node => node.type === 'decl');
}
const joinSelectors = (...rules) => rules.map(s => s.selector).join();
function ruleLength(...rules) {
return rules.map(r => r.nodes.length ? String(r) : '').join('').length;
}
/**
* @param {string} prop
* @return {{prefix: string, base:string, rest:string[]}}
*/
function splitProp(prop) {
// Treat vendor prefixed properties as if they were unprefixed;
// moving them when combined with non-prefixed properties can
// cause issues. e.g. moving -webkit-background-clip when there
// is a background shorthand definition.
const parts = prop.split('-');
if (prop[0] !== '-') {
return {
prefix: '',
base: parts[0],
rest: parts.slice(1)
};
} // Don't split css variables
if (prop[1] === '-') {
return {
prefix: null,
base: null,
rest: [prop]
};
} // Found prefix
return {
prefix: parts[1],
base: parts[2],
rest: parts.slice(3)
};
}
/**
* @param {string} propA
* @param {string} propB
*/
function isConflictingProp(propA, propB) {
if (propA === propB) {
// Same specificity
return true;
}
const a = splitProp(propA);
const b = splitProp(propB); // Don't resort css variables
if (!a.base && !b.base) {
return true;
} // Different base;
if (a.base !== b.base) {
return false;
} // Conflict if rest-count mismatches
if (a.rest.length !== b.rest.length) {
return true;
} // Conflict if rest parameters are equal (same but unprefixed)
return a.rest.every((s, index) => b.rest[index] === s);
}
/**
* @param {postcss.Rule} first
* @param {postcss.Rule} second
* @return {boolean} merged
*/
function mergeParents(first, second) {
// Null check for detached rules
if (!first.parent || !second.parent) {
return false;
} // Check if parents share node
if (first.parent === second.parent) {
return false;
} // sameParent() already called by canMerge()
second.remove();
first.parent.append(second);
return true;
}
/**
* @param {postcss.Rule} first
* @param {postcss.Rule} second
* @return {postcss.Rule} mergedRule
*/
function partialMerge(first, second) {
let intersection = intersect(getDecls(first), getDecls(second));
if (!intersection.length) {
return second;
}
let nextRule = second.next();
if (!nextRule) {
// Grab next cousin
const parentSibling = second.parent.next();
nextRule = parentSibling && parentSibling.nodes && parentSibling.nodes[0];
}
if (nextRule && nextRule.type === 'rule' && canMerge(second, nextRule)) {
let nextIntersection = intersect(getDecls(second), getDecls(nextRule));
if (nextIntersection.length > intersection.length) {
mergeParents(second, nextRule);
first = second;
second = nextRule;
intersection = nextIntersection;
}
}
const firstDecls = getDecls(first); // Filter out intersections with later conflicts in First
intersection = intersection.filter((decl, intersectIndex) => {
const indexOfDecl = indexOfDeclaration(firstDecls, decl);
const nextConflictInFirst = firstDecls.slice(indexOfDecl + 1).filter(d => isConflictingProp(d.prop, decl.prop));
if (!nextConflictInFirst.length) {
return true;
}
const nextConflictInIntersection = intersection.slice(intersectIndex + 1).filter(d => isConflictingProp(d.prop, decl.prop));
if (!nextConflictInIntersection.length) {
return false;
}
if (nextConflictInFirst.length !== nextConflictInIntersection.length) {
return false;
}
return nextConflictInFirst.every((d, index) => declarationIsEqual(d, nextConflictInIntersection[index]));
}); // Filter out intersections with previous conflicts in Second
const secondDecls = getDecls(second);
intersection = intersection.filter(decl => {
const nextConflictIndex = secondDecls.findIndex(d => isConflictingProp(d.prop, decl.prop));
if (nextConflictIndex === -1) {
return false;
}
if (!declarationIsEqual(secondDecls[nextConflictIndex], decl)) {
return false;
}
if (decl.prop.toLowerCase() !== 'direction' && decl.prop.toLowerCase() !== 'unicode-bidi' && secondDecls.some(declaration => declaration.prop.toLowerCase() === 'all')) {
return false;
}
secondDecls.splice(nextConflictIndex, 1);
return true;
});
if (!intersection.length) {
// Nothing to merge
return second;
}
const receivingBlock = second.clone();
receivingBlock.selector = joinSelectors(first, second);
receivingBlock.nodes = [];
second.parent.insertBefore(second, receivingBlock);
const firstClone = first.clone();
const secondClone = second.clone();
/**
* @param {function(postcss.Declaration):void} callback
* @return {function(postcss.Declaration)}
*/
function moveDecl(callback) {
return decl => {
if (~indexOfDeclaration(intersection, decl)) {
callback.call(this, decl);
}
};
}
firstClone.walkDecls(moveDecl(decl => {
decl.remove();
receivingBlock.append(decl);
}));
secondClone.walkDecls(moveDecl(decl => decl.remove()));
const merged = ruleLength(firstClone, receivingBlock, secondClone);
const original = ruleLength(first, second);
if (merged < original) {
first.replaceWith(firstClone);
second.replaceWith(secondClone);
[firstClone, receivingBlock, secondClone].forEach(r => {
if (!r.nodes.length) {
r.remove();
}
});
if (!secondClone.parent) {
return receivingBlock;
}
return secondClone;
} else {
receivingBlock.remove();
return second;
}
}
/**
* @param {string[]} browsers
* @param {Object.<string, boolean>} compatibilityCache
* @return {function(postcss.Rule)}
*/
function selectorMerger(browsers, compatibilityCache) {
/** @type {postcss.Rule} */
let cache = null;
return function (rule) {
// Prime the cache with the first rule, or alternately ensure that it is
// safe to merge both declarations before continuing
if (!cache || !canMerge(rule, cache, browsers, compatibilityCache)) {
cache = rule;
return;
} // Ensure that we don't deduplicate the same rule; this is sometimes
// caused by a partial merge
if (cache === rule) {
cache = rule;
return;
} // Parents merge: check if the rules have same parents, but not same parent nodes
mergeParents(cache, rule); // Merge when declarations are exactly equal
// e.g. h1 { color: red } h2 { color: red }
if (sameDeclarationsAndOrder(getDecls(rule), getDecls(cache))) {
rule.selector = joinSelectors(cache, rule);
cache.remove();
cache = rule;
return;
} // Merge when both selectors are exactly equal
// e.g. a { color: blue } a { font-weight: bold }
if (cache.selector === rule.selector) {
const cached = getDecls(cache);
rule.walk(decl => {
if (~indexOfDeclaration(cached, decl)) {
return decl.remove();
}
cache.append(decl);
});
rule.remove();
return;
} // Partial merge: check if the rule contains a subset of the last; if
// so create a joined selector with the subset, if smaller.
cache = partialMerge(cache, rule);
};
}
function pluginCreator() {
return {
postcssPlugin: 'postcss-merge-rules',
prepare(result) {
const resultOpts = result.opts || {};
const browsers = (0, _browserslist.default)(null, {
stats: resultOpts.stats,
path: __dirname,
env: resultOpts.env
});
const compatibilityCache = {};
return {
OnceExit(css) {
css.walkRules(selectorMerger(browsers, compatibilityCache));
}
};
}
};
}
pluginCreator.postcss = true;
var _default = pluginCreator;
exports.default = _default;
module.exports = exports.default;