@tbela99/css-parser
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CSS parser, minifier and validator for node and the browser
1,046 lines (1,043 loc) • 36.7 kB
JavaScript
import { replaceToken, parseString } from '../parser/parse.js';
import '../parser/tokenize.js';
import '../parser/utils/config.js';
import { EnumToken } from './types.js';
import { walkValues } from './walk.js';
import { doRender, renderToken } from '../renderer/render.js';
import '../renderer/sourcemap/lib/encode.js';
import { isWhiteSpace, isIdent, isFunction, isIdentStart } from '../syntax/syntax.js';
import { eq } from '../parser/utils/eq.js';
import * as index from './features/index.js';
import { FeatureWalkMode } from './features/type.js';
const combinators = ['+', '>', '~', '||', '|'];
const definedPropertySettings = { configurable: true, enumerable: false, writable: true };
const notEndingWith = ['(', '['].concat(combinators);
// @ts-ignore
const features = Object.values(index).sort((a, b) => a.ordering - b.ordering);
/**
* apply minification rules to the ast tree
* @param ast
* @param options
* @param recursive
* @param errors
* @param nestingContent
*
* @private
*/
function minify(ast, options = {}, recursive = false, errors, nestingContent, context = {}) {
let preprocess = false;
let postprocess = false;
let parents;
let replacement;
if (!('features' in options)) {
// @ts-ignore
options = {
removeDuplicateDeclarations: true,
computeShorthand: true,
computeCalcExpression: true,
removePrefix: false,
features: [], ...options
};
for (const feature of features) {
feature.register(options);
}
options.features.sort((a, b) => a.ordering - b.ordering);
}
for (const feature of options.features) {
if (feature.processMode & FeatureWalkMode.Pre) {
preprocess = true;
}
if (feature.processMode & FeatureWalkMode.Post) {
postprocess = true;
}
}
if (preprocess) {
parents = new Set([ast]);
for (const parent of parents) {
if (parent.typ == EnumToken.CommentTokenType ||
parent.typ == EnumToken.CDOCOMMTokenType) {
continue;
}
replacement = parent;
for (const feature of options.features) {
if ((feature.processMode & FeatureWalkMode.Pre) === 0 || (feature.accept != null && !feature.accept.has(parent.typ))) {
continue;
}
const result = feature.run(replacement, options, parent.parent ?? ast, context, FeatureWalkMode.Pre);
if (result != null) {
replacement = result;
}
}
if (replacement != parent && parent.parent != null) {
// @ts-ignore
replaceToken(parent.parent, parent, replacement);
}
if (('chi' in replacement)) {
// @ts-ignore
for (const node of replacement.chi) {
parents.add(Object.defineProperty(node, 'parent', {
...definedPropertySettings,
value: replacement
}));
}
}
}
for (const feature of options.features) {
if ((feature.processMode & FeatureWalkMode.Pre) && 'cleanup' in feature) {
// @ts-ignore
feature.cleanup(ast, options, context, FeatureWalkMode.Pre);
}
}
}
doMinify(ast, options, recursive, errors, nestingContent, context);
parents = new Set([ast]);
for (const parent of parents) {
if (parent.typ == EnumToken.CommentTokenType ||
parent.typ == EnumToken.CDOCOMMTokenType) {
continue;
}
replacement = parent;
if (postprocess) {
for (const feature of options.features) {
if ((feature.processMode & FeatureWalkMode.Post) === 0 || (feature.accept != null && !feature.accept.has(parent.typ))) {
continue;
}
const result = feature.run(replacement, options, parent.parent ?? ast, context, FeatureWalkMode.Post);
if (result != null) {
replacement = result;
}
}
}
if (replacement != null && replacement != parent && parent.parent != null) {
// @ts-ignore
replaceToken(parent.parent, parent, replacement);
}
if (('chi' in replacement)) {
for (const node of replacement.chi) {
parents.add(Object.defineProperty(node, 'parent', {
...definedPropertySettings,
value: replacement
}));
}
}
}
if (postprocess) {
for (const feature of options.features) {
if (feature.processMode & FeatureWalkMode.Post && 'cleanup' in feature) {
// @ts-ignore
feature.cleanup(ast, options, context, FeatureWalkMode.Post);
}
}
}
return ast;
}
/**
* reduce selectors
* @param acc
* @param curr
*
* @private
*/
function reduce(acc, curr) {
// trim :is()
// if (array.length == 1 && array[0][0] == ':is(' && array[0].at(-1) == ')') {
//
// curr = curr.slice(1, -1);
// }
if (curr[0] == '&') {
if (curr[1] == ' ' && !isIdent(curr[2]) && !isFunction(curr[2])) {
curr.splice(0, 2);
}
}
acc.push(curr.join(''));
return acc;
}
/**
* apply minification rules to the ast tree
* @param ast
* @param options
* @param recursive
* @param errors
* @param nestingContent
* @param context
*
* @private
*/
function doMinify(ast, options = {}, recursive = false, errors, nestingContent, context = {}) {
if (!('nodes' in context)) {
context.nodes = new Set;
}
if (context.nodes.has(ast)) {
return ast;
}
context.nodes.add(ast);
// @ts-ignore
if ('chi' in ast && ast.chi.length > 0) {
const reducer = reduce.bind(ast);
if (!nestingContent) {
nestingContent = options.nestingRules && ast.typ == EnumToken.RuleNodeType;
}
let i = 0;
let previous = null;
let node = null;
let nodeIndex = -1;
for (; i < ast.chi.length; i++) {
if (ast.chi[i].typ == EnumToken.CommentNodeType) {
continue;
}
node = ast.chi[i];
if (node.typ == EnumToken.AtRuleNodeType && node.nam == 'font-face') {
continue;
}
if (node.typ == EnumToken.KeyframesAtRuleNodeType) {
if (previous?.typ == EnumToken.KeyframesAtRuleNodeType &&
node.nam == previous.nam &&
node.val == previous.val) {
ast.chi?.splice(nodeIndex--, 1);
previous = ast?.chi?.[nodeIndex] ?? null;
i = nodeIndex;
continue;
}
}
else if (node.typ == EnumToken.KeyFramesRuleNodeType) {
if (previous?.typ == EnumToken.KeyFramesRuleNodeType &&
node.sel == previous.sel) {
previous.chi.push(...node.chi);
ast.chi.splice(i--, 1);
continue;
}
let k;
for (k = 0; k < node.chi.length; k++) {
if (node.chi[k].typ == EnumToken.DeclarationNodeType) {
let l = node.chi[k].val.length;
while (l--) {
if (node.chi[k].val[l].typ == EnumToken.ImportantTokenType) {
node.chi.splice(k--, 1);
break;
}
if ([EnumToken.WhitespaceTokenType, EnumToken.CommentTokenType].includes(node.chi[k].val[l].typ)) {
continue;
}
break;
}
}
}
}
else if (node.typ == EnumToken.AtRuleNodeType) {
if (node.nam == 'media' && ['all', '', null].includes(node.val)) {
ast.chi?.splice(i, 1, ...node.chi);
i--;
continue;
}
if (previous?.typ == EnumToken.AtRuleNodeType &&
node.nam != 'font-face' &&
previous.nam == node.nam &&
previous.val == node.val) {
if ('chi' in node) {
// @ts-ignore
previous.chi.push(...node.chi);
if (!hasDeclaration(previous)) {
context.nodes.delete(previous);
doMinify(previous, options, recursive, errors, nestingContent, context);
}
}
ast?.chi?.splice(i--, 1);
continue;
}
if (!hasDeclaration(node)) {
doMinify(node, options, recursive, errors, nestingContent, context);
}
previous = node;
nodeIndex = i;
continue;
}
// @ts-ignore
else if (node.typ == EnumToken.RuleNodeType) {
reduceRuleSelector(node);
let wrapper = null;
let match;
if (options.nestingRules) {
if (previous?.typ == EnumToken.RuleNodeType) {
reduceRuleSelector(previous);
// @ts-ignore
match = matchSelectors(previous.raw, node.raw, ast.typ);
if (match != null) {
wrapper = wrapNodes(previous, node, match, ast, reducer, i, nodeIndex);
nodeIndex = i - 1;
previous = ast.chi[nodeIndex];
}
}
if (wrapper != null) {
while (i < ast.chi.length) {
const nextNode = ast.chi[i];
if (nextNode.typ != EnumToken.RuleNodeType) {
break;
}
reduceRuleSelector(nextNode);
match = matchSelectors(wrapper.raw, nextNode.raw);
if (match == null) {
break;
}
wrapper = wrapNodes(wrapper, nextNode, match, ast, reducer, i, nodeIndex);
}
nodeIndex = --i;
previous = ast.chi[nodeIndex];
doMinify(wrapper, options, recursive, errors, nestingContent, context);
continue;
}
// @ts-ignore
else if (node.optimized != null &&
// @ts-ignore
node.optimized.match &&
// @ts-ignore
node.optimized.selector.length > 1) {
// @ts-ignore
wrapper = { ...node, chi: [], sel: node.optimized.optimized[0] };
// @ts-ignore
Object.defineProperty(wrapper, 'raw', {
...definedPropertySettings,
// @ts-ignore
value: [[node.optimized.optimized[0]]]
});
// @ts-ignore
node.sel = node.optimized.selector.reduce(reducer, []).join(',');
// @ts-ignore
node.raw = node.optimized.selector.slice();
// @ts-ignore
wrapper.chi.push(node);
// @ts-ignore
ast.chi.splice(i, 1, wrapper);
node = wrapper;
}
}
// @ts-ignore
else if (node.optimized?.match) {
let wrap = true;
// @ts-ignore
const selector = node.optimized.selector.reduce((acc, curr) => {
if (curr[0] == '&' && curr.length > 1) {
if (curr[1] == ' ') {
curr.splice(0, 2);
}
else {
curr.splice(0, 1);
}
}
else if (combinators.includes(curr[0])) {
curr.unshift('&');
wrap = false;
}
acc.push(curr);
return acc;
}, []);
if (!wrap) {
wrap = selector.some((s) => s[0] != '&');
}
let rule = null;
const optimized = node.optimized.optimized.slice();
if (optimized.length > 1) {
const check = optimized.at(-2);
if (!combinators.includes(check)) {
let last = optimized.pop();
wrap = false;
rule = optimized.join('') + `:is(${selector.map(s => {
if (s[0] == '&') {
s.splice(0, 1, last);
}
else {
s.unshift(last);
}
return s.join('');
}).join(',')})`;
}
}
if (rule == null) {
rule = selector.map((s) => {
if (s[0] == '&') {
s.splice(0, 1, ...node.optimized.optimized);
}
return s.join('');
}).join(',');
}
let sel = wrap ? node.optimized.optimized.join('') + `:is(${rule})` : rule;
if (sel.length < node.sel.length) {
node.sel = sel;
}
}
doMinify(node, options, recursive, errors, nestingContent, context);
}
if (previous != null) {
if ('chi' in previous && ('chi' in node)) {
if (previous.typ == node.typ) {
let shouldMerge = true;
let k = previous.chi.length;
while (k-- > 0) {
if (previous.chi[k].typ == EnumToken.CommentNodeType) {
continue;
}
shouldMerge = previous.chi[k].typ == EnumToken.DeclarationNodeType;
break;
}
if (shouldMerge) {
// @ts-ignore
if (((node.typ == EnumToken.RuleNodeType || node.typ == EnumToken.KeyFramesRuleNodeType) && node.sel == previous.sel) ||
// @ts-ignore
(node.typ == EnumToken.AtRuleNodeType) && node.val != 'font-face' && node.val == previous.val) {
// @ts-ignore
node.chi.unshift(...previous.chi);
doMinify(node, options, recursive, errors, nestingContent, context);
ast.chi.splice(nodeIndex, 1);
previous = ast.chi[--i];
nodeIndex = i;
continue;
}
else if (node.typ == previous?.typ && [EnumToken.KeyFramesRuleNodeType, EnumToken.RuleNodeType].includes(node.typ)) {
const intersect = diff(previous, node, reducer, options);
if (intersect != null) {
if (intersect.node1.chi.length == 0) {
ast.chi.splice(i--, 1);
}
else {
ast.chi.splice(i--, 1, intersect.node1);
}
if (intersect.node2.chi.length == 0) {
ast.chi.splice(nodeIndex, 1, intersect.result);
i--;
if (nodeIndex == i) {
nodeIndex = i;
}
}
else {
ast.chi.splice(nodeIndex, 1, intersect.result, intersect.node2);
i = (nodeIndex ?? 0) + 1;
}
reduceRuleSelector(intersect.result);
if (node != ast.chi[i]) {
node = ast.chi[i];
}
previous = intersect.result;
nodeIndex = i;
}
}
}
}
if (recursive && previous != node) {
if (!hasDeclaration(previous)) {
doMinify(previous, options, recursive, errors, nestingContent, context);
}
}
}
}
if (!nestingContent &&
previous != null &&
previous.typ == EnumToken.RuleNodeType &&
previous.sel.includes('&')) {
fixSelector(previous);
}
previous = node;
nodeIndex = i;
}
if (recursive && node != null && ('chi' in node)) {
if (node.typ == EnumToken.KeyframesAtRuleNodeType || !node.chi.some(n => n.typ == EnumToken.DeclarationNodeType)) {
if (!(node.typ == EnumToken.AtRuleNodeType && node.nam != 'font-face')) {
doMinify(node, options, recursive, errors, nestingContent, context);
}
}
}
if (!nestingContent &&
node != null &&
node.typ == EnumToken.RuleNodeType &&
node.sel.includes('&')) {
fixSelector(node);
}
}
return ast;
}
/**
* check if a rule has a declaration
* @param node
*
* @private
*/
function hasDeclaration(node) {
// @ts-ignore
for (let i = 0; i < node.chi?.length; i++) {
// @ts-ignore
if (node.chi[i].typ == EnumToken.CommentNodeType) {
continue;
}
// @ts-ignore
return node.chi[i].typ == EnumToken.DeclarationNodeType;
}
return true;
}
/**
* optimize selector
* @param selector
*
* @private
*/
function optimizeSelector(selector) {
selector = selector.reduce((acc, curr) => {
// @ts-ignore
if (curr.length > 0 && curr.at(-1).startsWith(':is(')) {
// @ts-ignore
const rules = splitRule(curr.at(-1).slice(4, -1)).map(x => {
if (x[0] == '&' && x.length > 1) {
return x.slice(x[1] == ' ' ? 2 : 1);
}
return x;
});
const part = curr.slice(0, -1);
for (const rule of rules) {
acc.push(part.concat(rule));
}
return acc;
}
acc.push(curr);
return acc;
}, []);
const optimized = [];
const k = selector.reduce((acc, curr) => acc == 0 ? curr.length : (curr.length == 0 ? acc : Math.min(acc, curr.length)), 0);
let i = 0;
let j;
let match;
for (; i < k; i++) {
const item = selector[0][i];
match = true;
for (j = 1; j < selector.length; j++) {
if (item != selector[j][i]) {
match = false;
break;
}
}
if (!match) {
break;
}
optimized.push(item);
}
while (optimized.length > 0) {
const last = optimized.at(-1);
if ((last == ' ' || combinators.includes(last))) {
optimized.pop();
continue;
}
break;
}
selector.forEach((selector) => selector.splice(0, optimized.length));
let reducible = optimized.length == 1;
if (optimized[0] == '&') {
if (optimized[1] == ' ') {
optimized.splice(0, 2);
}
}
if (optimized.length == 0 ||
(optimized[0].charAt(0) == '&' ||
selector.length == 1)) {
return {
match: false,
optimized,
selector: selector.map((selector) => selector[0] == '&' && selector[1] == ' ' ? selector.slice(2) : (selector)),
reducible: selector.length > 1 && selector.every((selector) => !combinators.includes(selector[0]))
};
}
return {
match: true,
optimized,
selector: selector.reduce((acc, curr) => {
let hasCompound = true;
if (hasCompound && curr.length > 0) {
hasCompound = !['&'].concat(combinators).includes(curr[0].charAt(0));
}
// @ts-ignore
if (hasCompound && curr[0] == ' ') {
hasCompound = false;
curr.unshift('&');
}
if (curr.length == 0) {
curr.push('&');
hasCompound = false;
}
if (reducible) {
const chr = curr[0].charAt(0);
// @ts-ignore
reducible = chr == '.' || chr == ':' || isIdentStart(chr.codePointAt(0));
}
acc.push(hasCompound ? ['&'].concat(curr) : curr);
return acc;
}, []),
reducible: selector.every((selector) => !['>', '+', '~', '&'].includes(selector[0]))
};
}
/**
* split selector string
* @param buffer
*
* @internal
*/
function splitRule(buffer) {
const result = [[]];
let str = '';
for (let i = 0; i < buffer.length; i++) {
let chr = buffer.charAt(i);
if (isWhiteSpace(chr.charCodeAt(0))) {
if (str !== '') {
// @ts-ignore
result.at(-1).push(str);
str = '';
}
// @ts-ignore
if (result.at(-1).length > 0) {
// @ts-ignore
result.at(-1).push(' ');
}
// i = k;
continue;
}
if (chr == ',') {
if (str !== '') {
result.at(-1).push(str);
str = '';
}
result.push([]);
continue;
}
if (chr == '.') {
if (str !== '') {
result.at(-1).push(str);
str = '';
}
str += chr;
continue;
}
if (combinators.includes(chr)) {
if (str !== '') {
result.at(-1).push(str);
str = '';
}
if (chr == '|' && buffer.charAt(i + 1) == '|') {
chr += buffer.charAt(++i);
}
result.at(-1).push(chr);
continue;
}
if (chr == ':') {
if (str !== '') {
result.at(-1).push(str);
str = '';
}
if (buffer.charAt(i + 1) == ':') {
chr += buffer.charAt(++i);
}
str += chr;
continue;
}
str += chr;
if (chr == '\\') {
str += buffer.charAt(++i);
continue;
}
if (chr == '(' || chr == '[') {
const open = chr;
const close = chr == '(' ? ')' : ']';
let inParens = 1;
let k = i;
while (++k < buffer.length) {
chr = buffer.charAt(k);
if (chr == '\\') {
str += buffer.slice(k, k + 2);
k++;
continue;
}
str += chr;
if (chr == open) {
inParens++;
}
else if (chr == close) {
inParens--;
}
if (inParens == 0) {
break;
}
}
i = k;
}
}
if (str !== '') {
result.at(-1).push(str);
}
return result;
}
/**
* reduce selector
* @param acc
* @param curr
*
* @private
*/
function reduceSelector(acc, curr) {
let hasCompoundSelector = true;
// @ts-ignore
curr = curr.slice(this.match[0].length);
while (curr.length > 0) {
if (curr[0] == ' ') {
hasCompoundSelector = false;
curr.unshift('&');
continue;
}
break;
}
if (hasCompoundSelector && curr.length > 0) {
hasCompoundSelector = !['&'].concat(combinators).includes(curr[0].charAt(0));
}
if (curr[0] == ':is(') {
let canReduce = true;
const isCompound = curr.reduce((acc, token, index) => {
if (index == 0) {
canReduce = curr[1] == '&';
}
else if (token == ')') ;
else if (token == ',') {
if (!canReduce) {
canReduce = curr[index + 1] == '&';
}
acc.push([]);
}
else
acc.at(-1)?.push(token);
return acc;
}, [[]]);
if (canReduce) {
curr = isCompound.reduce((acc, curr) => {
if (acc.length > 0) {
acc.push(',');
}
acc.push(...curr);
return acc;
}, []);
}
}
// @ts-ignore
acc.push(this.match.length == 0 ? ['&'] : (hasCompoundSelector && curr[0] != '&' && (curr.length == 0 || !combinators.includes(curr[0].charAt(0))) ? ['&'].concat(curr) : curr));
return acc;
}
/**
* match selectors
* @param selector1
* @param selector2
*
* @private
*/
function matchSelectors(selector1, selector2) {
let match = [[]];
const j = Math.min(selector1.reduce((acc, curr) => Math.min(acc, curr.length), selector1.length > 0 ? selector1[0].length : 0), selector2.reduce((acc, curr) => Math.min(acc, curr.length), selector2.length > 0 ? selector2[0].length : 0));
let i = 0;
let k;
let l;
let token;
let matching = true;
let matchFunction = 0;
let inAttr = 0;
for (; i < j; i++) {
k = 0;
token = selector1[0][i];
for (; k < selector1.length; k++) {
if (selector1[k][i] != token) {
matching = false;
break;
}
}
if (matching) {
l = 0;
for (; l < selector2.length; l++) {
if (selector2[l][i] != token) {
matching = false;
break;
}
}
}
if (!matching) {
break;
}
if (token.endsWith('(')) {
matchFunction++;
}
match.at(-1).push(token);
}
// invalid function
if (matchFunction != 0 || inAttr != 0) {
return null;
}
for (const part of match) {
while (part.length > 0) {
const token = part.at(-1);
if (token == ' ' || combinators.includes(token) || notEndingWith.includes(token.at(-1))) {
part.pop();
continue;
}
break;
}
}
if (match.every(t => t.length == 0)) {
return null;
}
if (eq([['&']], match)) {
return null;
}
const reducer = reduceSelector.bind({ match });
// @ts-ignore
selector1 = selector1.reduce(reducer, []);
// @ts-ignore
selector2 = selector2.reduce(reducer, []);
return selector1 == null || selector2 == null ? null : {
eq: eq(selector1, selector2),
match,
selector1,
selector2
};
}
/**
* fix selector
* @param node
*
* @private
*/
function fixSelector(node) {
if (node.sel.includes('&')) {
const attributes = parseString(node.sel);
for (const attr of walkValues(attributes)) {
if (attr.value.typ == EnumToken.PseudoClassFuncTokenType && attr.value.val == ':is') {
let i = attr.value.chi.length;
while (i--) {
if (attr.value.chi[i].typ == EnumToken.LiteralTokenType && attr.value.chi[i].val == '&') {
attr.value.chi.splice(i, 1);
}
}
}
}
node.sel = attributes.reduce((acc, curr) => acc + renderToken(curr), '');
}
}
/**
* wrap nodes
* @param previous
* @param node
* @param match
* @param ast
* @param reducer
* @param i
* @param nodeIndex
*
* @private
*/
function wrapNodes(previous, node, match, ast, reducer, i, nodeIndex) {
// @ts-ignore
let pSel = match.selector1.reduce(reducer, []).join(',');
// @ts-ignore
let nSel = match.selector2.reduce(reducer, []).join(',');
// @ts-ignore
const wrapper = { ...previous, chi: [], sel: match.match.reduce(reducer, []).join(',') };
Object.defineProperty(wrapper, 'raw', {
...definedPropertySettings,
value: match.match.map(t => t.slice())
});
if (pSel == '&' || pSel === '') {
wrapper.chi.push(...previous.chi);
if ((nSel == '&' || nSel === '')) {
wrapper.chi.push(...node.chi);
}
else {
wrapper.chi.push(node);
}
}
else {
wrapper.chi.push(previous, node);
}
ast.chi.splice(i, 1, wrapper);
ast.chi.splice(nodeIndex, 1);
previous.sel = pSel;
previous.raw = match.selector1;
node.sel = nSel;
node.raw = match.selector2;
reduceRuleSelector(wrapper);
return wrapper;
}
/**
* diff nodes
* @param n1
* @param n2
* @param reducer
* @param options
*
* @private
*/
function diff(n1, n2, reducer, options = {}) {
if (!('cache' in options)) {
options.cache = new WeakMap();
}
let node1 = n1;
let node2 = n2;
let exchanged = false;
if (node1.chi.length > node2.chi.length) {
const t = node1;
node1 = node2;
node2 = t;
exchanged = true;
}
let i = node1.chi.length;
let j = node2.chi.length;
const raw1 = node1.raw;
const raw2 = node2.raw;
if (raw1 != null && raw2 != null) {
const prefixes1 = new Set;
const prefixes2 = new Set;
for (const token1 of raw1) {
for (const t of token1) {
if (t[0] == ':') {
const matches = t.match(/::?-([a-z]+)-/);
if (matches == null) {
continue;
}
prefixes1.add(matches[1]);
if (prefixes1.size > 1) {
break;
}
}
}
if (prefixes1.size > 1) {
break;
}
}
for (const token2 of raw2) {
for (const t of token2) {
if (t[0] == ':') {
const matches = t.match(/::?-([a-z]+)-/);
if (matches == null) {
continue;
}
prefixes2.add(matches[1]);
if (prefixes2.size > 1) {
break;
}
}
}
if (prefixes2.size > 1) {
break;
}
}
if (prefixes1.size != prefixes2.size) {
return null;
}
for (const prefix of prefixes1) {
if (!prefixes2.has(prefix)) {
return null;
}
}
}
const css1 = options.cache.get(node1);
const css2 = options.cache.get(node2);
node1 = { ...node1, chi: node1.chi.slice() };
node2 = { ...node2, chi: node2.chi.slice() };
if (css1 != null) {
options.cache.set(node1, css1);
}
if (css2 != null) {
options.cache.set(node2, css2);
}
if (raw1 != null) {
Object.defineProperty(node1, 'raw', { ...definedPropertySettings, value: raw1 });
}
if (raw2 != null) {
Object.defineProperty(node2, 'raw', { ...definedPropertySettings, value: raw2 });
}
const intersect = [];
while (i--) {
if (node1.chi[i].typ == EnumToken.CommentNodeType) {
continue;
}
j = node2.chi.length;
while (j--) {
if (node2.chi[j].typ == EnumToken.CommentNodeType) {
continue;
}
if (node1.chi[i].nam == node2.chi[j].nam) {
if (node1.chi[i].typ == node2.chi[j].typ && eq(node1.chi[i], node2.chi[j])) {
intersect.push(node1.chi[i]);
node1.chi.splice(i, 1);
node2.chi.splice(j, 1);
options.cache.delete(node1);
options.cache.delete(node2);
break;
}
}
}
}
const result = (intersect.length == 0 ? null : {
...node1,
// @ts-ignore
sel: [...new Set([...(n1?.raw?.reduce(reducer, []) ?? splitRule(n1.sel)).concat(n2?.raw?.reduce(reducer, []) ?? splitRule(n2.sel))])].join(','),
chi: intersect.reverse()
});
if (result == null || [n1, n2].reduce((acc, curr) => {
let css = options.cache.get(curr);
if (css == null) {
css = doRender(curr, options).code;
options.cache.set(curr, css);
}
return curr.chi.length == 0 ? acc : acc + css.length;
}, 0) <= [node1, node2, result].reduce((acc, curr) => {
const css = doRender(curr, options).code;
return curr.chi.length == 0 ? acc : acc + css.length;
}, 0)) {
return null;
}
return { result, node1: exchanged ? node2 : node1, node2: exchanged ? node1 : node2 };
}
/**
* reduce rule selector
* @param node
*
* @private
*/
function reduceRuleSelector(node) {
if (node.raw == null) {
Object.defineProperty(node, 'raw', { ...definedPropertySettings, value: splitRule(node.sel) });
}
let optimized = optimizeSelector(node.raw.reduce((acc, curr) => {
acc.push(curr.slice());
return acc;
}, []));
if (optimized != null) {
Object.defineProperty(node, 'optimized', { ...definedPropertySettings, value: optimized });
}
if (optimized != null && optimized.match && optimized.reducible && optimized.selector.length > 1) {
for (const selector of optimized.selector) {
if (selector.length > 1 && selector[0] == '&' &&
(combinators.includes(selector[1]) || !/^[a-zA-Z:]/.test(selector[1]))) {
selector.shift();
}
}
const unique = new Set;
const raw = [
[
optimized.optimized[0], ':is('
].concat(optimized.selector.reduce((acc, curr) => {
const sig = curr.join('');
if (!unique.has(sig)) {
if (acc.length > 0) {
acc.push(',');
}
unique.add(sig);
acc.push(...curr);
}
return acc;
}, [])).concat(')')
];
const sel = raw[0].join('');
if (sel.length < node.sel.length) {
node.sel = sel;
Object.defineProperty(node, 'raw', { ...definedPropertySettings, value: raw });
}
}
}
export { combinators, definedPropertySettings, minify, splitRule };