utils.cjs•4 kB
'use strict';
const { hasOwnProperty } = Object.prototype;
function isEqualSelectors(a, b) {
let cursor1 = a.head;
let cursor2 = b.head;
while (cursor1 !== null && cursor2 !== null && cursor1.data.id === cursor2.data.id) {
cursor1 = cursor1.next;
cursor2 = cursor2.next;
}
return cursor1 === null && cursor2 === null;
}
function isEqualDeclarations(a, b) {
let cursor1 = a.head;
let cursor2 = b.head;
while (cursor1 !== null && cursor2 !== null && cursor1.data.id === cursor2.data.id) {
cursor1 = cursor1.next;
cursor2 = cursor2.next;
}
return cursor1 === null && cursor2 === null;
}
function compareDeclarations(declarations1, declarations2) {
const result = {
eq: [],
ne1: [],
ne2: [],
ne2overrided: []
};
const fingerprints = Object.create(null);
const declarations2hash = Object.create(null);
for (let cursor = declarations2.head; cursor; cursor = cursor.next) {
declarations2hash[cursor.data.id] = true;
}
for (let cursor = declarations1.head; cursor; cursor = cursor.next) {
const data = cursor.data;
if (data.fingerprint) {
fingerprints[data.fingerprint] = data.important;
}
if (declarations2hash[data.id]) {
declarations2hash[data.id] = false;
result.eq.push(data);
} else {
result.ne1.push(data);
}
}
for (let cursor = declarations2.head; cursor; cursor = cursor.next) {
const data = cursor.data;
if (declarations2hash[data.id]) {
// when declarations1 has an overriding declaration, this is not a difference
// unless no !important is used on prev and !important is used on the following
if (!hasOwnProperty.call(fingerprints, data.fingerprint) ||
(!fingerprints[data.fingerprint] && data.important)) {
result.ne2.push(data);
}
result.ne2overrided.push(data);
}
}
return result;
}
function addSelectors(dest, source) {
source.forEach((sourceData) => {
const newStr = sourceData.id;
let cursor = dest.head;
while (cursor) {
const nextStr = cursor.data.id;
if (nextStr === newStr) {
return;
}
if (nextStr > newStr) {
break;
}
cursor = cursor.next;
}
dest.insert(dest.createItem(sourceData), cursor);
});
return dest;
}
// check if simpleselectors has no equal specificity and element selector
function hasSimilarSelectors(selectors1, selectors2) {
let cursor1 = selectors1.head;
while (cursor1 !== null) {
let cursor2 = selectors2.head;
while (cursor2 !== null) {
if (cursor1.data.compareMarker === cursor2.data.compareMarker) {
return true;
}
cursor2 = cursor2.next;
}
cursor1 = cursor1.next;
}
return false;
}
// test node can't to be skipped
function unsafeToSkipNode(node) {
switch (node.type) {
case 'Rule':
// unsafe skip ruleset with selector similarities
return hasSimilarSelectors(node.prelude.children, this);
case 'Atrule':
// can skip at-rules with blocks
if (node.block) {
// unsafe skip at-rule if block contains something unsafe to skip
return node.block.children.some(unsafeToSkipNode, this);
}
break;
case 'Declaration':
return false;
}
// unsafe by default
return true;
}
exports.addSelectors = addSelectors;
exports.compareDeclarations = compareDeclarations;
exports.hasSimilarSelectors = hasSimilarSelectors;
exports.isEqualDeclarations = isEqualDeclarations;
exports.isEqualSelectors = isEqualSelectors;
exports.unsafeToSkipNode = unsafeToSkipNode;