Homec4science
Diffusion Open Access Compliance Check Tool (OACCT) (issn4frontend) Browse

rOACCT/node_modules/clean-css/lib/optimizer/level-2/remove-unused-at-rules.js
49c99f97fe9aissn4frontend

Last Change
Raw File

remove-unused-at-rules.js
View Options

var populateComponents = require('./properties/populate-components');
var wrapForOptimizing = require('../wrap-for-optimizing').single;
var restoreFromOptimizing = require('../restore-from-optimizing');
var Token = require('../../tokenizer/token');
var animationNameRegex = /^(-moz-|-o-|-webkit-)?animation-name$/;
var animationRegex = /^(-moz-|-o-|-webkit-)?animation$/;
var keyframeRegex = /^@(-moz-|-o-|-webkit-)?keyframes /;
var importantRegex = /\s{0,31}!important$/;
var optionalMatchingQuotesRegex = /^(['"]?)(.*)\1$/;
function normalize(value) {
return value
.replace(optionalMatchingQuotesRegex, '$2')
.replace(importantRegex, '');
}
function removeUnusedAtRules(tokens, context) {
removeUnusedAtRule(tokens, matchCounterStyle, markCounterStylesAsUsed, context);
removeUnusedAtRule(tokens, matchFontFace, markFontFacesAsUsed, context);
removeUnusedAtRule(tokens, matchKeyframe, markKeyframesAsUsed, context);
removeUnusedAtRule(tokens, matchNamespace, markNamespacesAsUsed, context);
}
function removeUnusedAtRule(tokens, matchCallback, markCallback, context) {
var atRules = {};
var atRule;
var atRuleTokens;
var atRuleToken;
var zeroAt;
var i, l;
for (i = 0, l = tokens.length; i < l; i++) {
matchCallback(tokens[i], atRules);
}
if (Object.keys(atRules).length === 0) {
return;
}
markUsedAtRules(tokens, markCallback, atRules, context);
for (atRule in atRules) {
atRuleTokens = atRules[atRule];
for (i = 0, l = atRuleTokens.length; i < l; i++) {
atRuleToken = atRuleTokens[i];
zeroAt = atRuleToken[0] == Token.AT_RULE ? 1 : 2;
atRuleToken[zeroAt] = [];
}
}
}
function markUsedAtRules(tokens, markCallback, atRules, context) {
var boundMarkCallback = markCallback(atRules);
var i, l;
for (i = 0, l = tokens.length; i < l; i++) {
switch (tokens[i][0]) {
case Token.RULE:
boundMarkCallback(tokens[i], context);
break;
case Token.NESTED_BLOCK:
markUsedAtRules(tokens[i][2], markCallback, atRules, context);
}
}
}
function matchCounterStyle(token, atRules) {
var match;
if (token[0] == Token.AT_RULE_BLOCK && token[1][0][1].indexOf('@counter-style') === 0) {
match = token[1][0][1].split(' ')[1];
atRules[match] = atRules[match] || [];
atRules[match].push(token);
}
}
function markCounterStylesAsUsed(atRules) {
return function(token, context) {
var property;
var wrappedProperty;
var i, l;
for (i = 0, l = token[2].length; i < l; i++) {
property = token[2][i];
if (property[1][1] == 'list-style') {
wrappedProperty = wrapForOptimizing(property);
populateComponents([wrappedProperty], context.validator, context.warnings);
if (wrappedProperty.components[0].value[0][1] in atRules) {
delete atRules[property[2][1]];
}
restoreFromOptimizing([wrappedProperty]);
}
if (property[1][1] == 'list-style-type' && property[2][1] in atRules) {
delete atRules[property[2][1]];
}
}
};
}
function matchFontFace(token, atRules) {
var property;
var match;
var i, l;
if (token[0] == Token.AT_RULE_BLOCK && token[1][0][1] == '@font-face') {
for (i = 0, l = token[2].length; i < l; i++) {
property = token[2][i];
if (property[1][1] == 'font-family') {
match = normalize(property[2][1].toLowerCase());
atRules[match] = atRules[match] || [];
atRules[match].push(token);
break;
}
}
}
}
function markFontFacesAsUsed(atRules) {
return function(token, context) {
var property;
var wrappedProperty;
var component;
var normalizedMatch;
var i, l;
var j, m;
for (i = 0, l = token[2].length; i < l; i++) {
property = token[2][i];
if (property[1][1] == 'font') {
wrappedProperty = wrapForOptimizing(property);
populateComponents([wrappedProperty], context.validator, context.warnings);
component = wrappedProperty.components[6];
for (j = 0, m = component.value.length; j < m; j++) {
normalizedMatch = normalize(component.value[j][1].toLowerCase());
if (normalizedMatch in atRules) {
delete atRules[normalizedMatch];
}
}
restoreFromOptimizing([wrappedProperty]);
}
if (property[1][1] == 'font-family') {
for (j = 2, m = property.length; j < m; j++) {
normalizedMatch = normalize(property[j][1].toLowerCase());
if (normalizedMatch in atRules) {
delete atRules[normalizedMatch];
}
}
}
}
};
}
function matchKeyframe(token, atRules) {
var match;
if (token[0] == Token.NESTED_BLOCK && keyframeRegex.test(token[1][0][1])) {
match = token[1][0][1].split(' ')[1];
atRules[match] = atRules[match] || [];
atRules[match].push(token);
}
}
function markKeyframesAsUsed(atRules) {
return function(token, context) {
var property;
var wrappedProperty;
var component;
var i, l;
var j, m;
for (i = 0, l = token[2].length; i < l; i++) {
property = token[2][i];
if (animationRegex.test(property[1][1])) {
wrappedProperty = wrapForOptimizing(property);
populateComponents([wrappedProperty], context.validator, context.warnings);
component = wrappedProperty.components[7];
for (j = 0, m = component.value.length; j < m; j++) {
if (component.value[j][1] in atRules) {
delete atRules[component.value[j][1]];
}
}
restoreFromOptimizing([wrappedProperty]);
}
if (animationNameRegex.test(property[1][1])) {
for (j = 2, m = property.length; j < m; j++) {
if (property[j][1] in atRules) {
delete atRules[property[j][1]];
}
}
}
}
};
}
function matchNamespace(token, atRules) {
var match;
if (token[0] == Token.AT_RULE && token[1].indexOf('@namespace') === 0) {
match = token[1].split(' ')[1];
atRules[match] = atRules[match] || [];
atRules[match].push(token);
}
}
function markNamespacesAsUsed(atRules) {
var namespaceRegex = new RegExp(Object.keys(atRules).join('\\||') + '\\|', 'g');
return function(token) {
var match;
var scope;
var normalizedMatch;
var i, l;
var j, m;
for (i = 0, l = token[1].length; i < l; i++) {
scope = token[1][i];
match = scope[1].match(namespaceRegex);
for (j = 0, m = match.length; j < m; j++) {
normalizedMatch = match[j].substring(0, match[j].length - 1);
if (normalizedMatch in atRules) {
delete atRules[normalizedMatch];
}
}
}
};
}
module.exports = removeUnusedAtRules;
c4science · Help