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monjack
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app_vue/node_modules/clean-css/lib/optimizer/level-1/optimize.js
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325
app_vue/node_modules/clean-css/lib/optimizer/level-1/optimize.js
generated
vendored
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var sortSelectors = require('./sort-selectors');
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var tidyRules = require('./tidy-rules');
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var tidyBlock = require('./tidy-block');
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var tidyAtRule = require('./tidy-at-rule');
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var Hack = require('../hack');
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var removeUnused = require('../remove-unused');
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var restoreFromOptimizing = require('../restore-from-optimizing');
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var wrapForOptimizing = require('../wrap-for-optimizing').all;
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var configuration = require('../configuration');
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var optimizers = require('./value-optimizers');
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var OptimizationLevel = require('../../options/optimization-level').OptimizationLevel;
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var Token = require('../../tokenizer/token');
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var Marker = require('../../tokenizer/marker');
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var formatPosition = require('../../utils/format-position');
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var serializeRules = require('../../writer/one-time').rules;
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var CHARSET_TOKEN = '@charset';
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var CHARSET_REGEXP = new RegExp('^' + CHARSET_TOKEN, 'i');
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var DEFAULT_ROUNDING_PRECISION = require('../../options/rounding-precision').DEFAULT;
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var VARIABLE_PROPERTY_NAME_PATTERN = /^--\S+$/;
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var PROPERTY_NAME_PATTERN = /^(?:-chrome-|-[\w-]+\w|\w[\w-]+\w|\w{1,})$/;
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var IMPORT_PREFIX_PATTERN = /^@import/i;
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var URL_PREFIX_PATTERN = /^url\(/i;
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function startsAsUrl(value) {
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return URL_PREFIX_PATTERN.test(value);
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}
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function isImport(token) {
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return IMPORT_PREFIX_PATTERN.test(token[1]);
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}
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function isLegacyFilter(property) {
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var value;
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if (property.name == 'filter' || property.name == '-ms-filter') {
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value = property.value[0][1];
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return value.indexOf('progid') > -1
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|| value.indexOf('alpha') === 0
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|| value.indexOf('chroma') === 0;
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}
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return false;
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}
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function noop() {}
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function noopValueOptimizer(_name, value, _options) { return value; }
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function optimizeBody(rule, properties, context) {
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var options = context.options;
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var valueOptimizers;
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var property, name, type, value;
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var propertyToken;
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var propertyOptimizer;
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var serializedRule = serializeRules(rule);
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var _properties = wrapForOptimizing(properties);
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var pluginValueOptimizers = context.options.plugins.level1Value;
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var pluginPropertyOptimizers = context.options.plugins.level1Property;
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var isVariable;
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var i, l;
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for (i = 0, l = _properties.length; i < l; i++) {
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var j, k, m, n;
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property = _properties[i];
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name = property.name;
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propertyOptimizer = configuration[name] && configuration[name].propertyOptimizer || noop;
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valueOptimizers = configuration[name] && configuration[name].valueOptimizers || [optimizers.whiteSpace];
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isVariable = VARIABLE_PROPERTY_NAME_PATTERN.test(name);
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if (isVariable) {
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valueOptimizers = options.variableOptimizers.length > 0
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? options.variableOptimizers
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: [optimizers.whiteSpace];
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}
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if (!isVariable && !PROPERTY_NAME_PATTERN.test(name)) {
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propertyToken = property.all[property.position];
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context.warnings.push('Invalid property name \'' + name + '\' at ' + formatPosition(propertyToken[1][2][0]) + '. Ignoring.');
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property.unused = true;
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continue;
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}
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if (property.value.length === 0) {
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propertyToken = property.all[property.position];
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context.warnings.push('Empty property \'' + name + '\' at ' + formatPosition(propertyToken[1][2][0]) + '. Ignoring.');
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property.unused = true;
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continue;
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}
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if (property.hack && (
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(property.hack[0] == Hack.ASTERISK || property.hack[0] == Hack.UNDERSCORE)
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&& !options.compatibility.properties.iePrefixHack
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|| property.hack[0] == Hack.BACKSLASH && !options.compatibility.properties.ieSuffixHack
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|| property.hack[0] == Hack.BANG && !options.compatibility.properties.ieBangHack)) {
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property.unused = true;
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continue;
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}
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if (!options.compatibility.properties.ieFilters && isLegacyFilter(property)) {
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property.unused = true;
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continue;
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}
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if (property.block) {
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optimizeBody(rule, property.value[0][1], context);
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continue;
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}
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for (j = 0, m = property.value.length; j < m; j++) {
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type = property.value[j][0];
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value = property.value[j][1];
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if (type == Token.PROPERTY_BLOCK) {
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property.unused = true;
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context.warnings.push('Invalid value token at ' + formatPosition(value[0][1][2][0]) + '. Ignoring.');
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break;
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}
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if (startsAsUrl(value) && !context.validator.isUrl(value)) {
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property.unused = true;
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context.warnings.push('Broken URL \'' + value + '\' at ' + formatPosition(property.value[j][2][0]) + '. Ignoring.');
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break;
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}
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for (k = 0, n = valueOptimizers.length; k < n; k++) {
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value = valueOptimizers[k](name, value, options);
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}
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for (k = 0, n = pluginValueOptimizers.length; k < n; k++) {
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value = pluginValueOptimizers[k](name, value, options);
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}
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property.value[j][1] = value;
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}
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propertyOptimizer(serializedRule, property, options);
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for (j = 0, m = pluginPropertyOptimizers.length; j < m; j++) {
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pluginPropertyOptimizers[j](serializedRule, property, options);
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}
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}
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restoreFromOptimizing(_properties);
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removeUnused(_properties);
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removeComments(properties, options);
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}
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function removeComments(tokens, options) {
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var token;
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var i;
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for (i = 0; i < tokens.length; i++) {
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token = tokens[i];
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if (token[0] != Token.COMMENT) {
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continue;
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}
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optimizeComment(token, options);
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if (token[1].length === 0) {
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tokens.splice(i, 1);
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i--;
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}
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}
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}
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function optimizeComment(token, options) {
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if (token[1][2] == Marker.EXCLAMATION && (options.level[OptimizationLevel.One].specialComments == 'all' || options.commentsKept < options.level[OptimizationLevel.One].specialComments)) {
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options.commentsKept++;
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return;
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}
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token[1] = [];
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}
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function cleanupCharsets(tokens) {
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var hasCharset = false;
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for (var i = 0, l = tokens.length; i < l; i++) {
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var token = tokens[i];
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if (token[0] != Token.AT_RULE) { continue; }
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if (!CHARSET_REGEXP.test(token[1])) { continue; }
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if (hasCharset || token[1].indexOf(CHARSET_TOKEN) == -1) {
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tokens.splice(i, 1);
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i--;
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l--;
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} else {
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hasCharset = true;
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tokens.splice(i, 1);
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tokens.unshift([Token.AT_RULE, token[1].replace(CHARSET_REGEXP, CHARSET_TOKEN)]);
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}
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}
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}
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function buildUnitRegexp(options) {
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var units = ['px', 'em', 'ex', 'cm', 'mm', 'in', 'pt', 'pc', '%'];
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var otherUnits = ['ch', 'rem', 'vh', 'vm', 'vmax', 'vmin', 'vw'];
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otherUnits.forEach(function(unit) {
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if (options.compatibility.units[unit]) {
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units.push(unit);
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}
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});
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return new RegExp('(^|\\s|\\(|,)0(?:' + units.join('|') + ')(\\W|$)', 'g');
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}
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function buildPrecisionOptions(roundingPrecision) {
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var precisionOptions = {
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matcher: null,
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units: {}
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};
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var optimizable = [];
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var unit;
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var value;
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for (unit in roundingPrecision) {
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value = roundingPrecision[unit];
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if (value != DEFAULT_ROUNDING_PRECISION) {
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precisionOptions.units[unit] = {};
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precisionOptions.units[unit].value = value;
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precisionOptions.units[unit].multiplier = 10 ** value;
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optimizable.push(unit);
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}
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}
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if (optimizable.length > 0) {
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precisionOptions.enabled = true;
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precisionOptions.decimalPointMatcher = new RegExp('(\\d)\\.($|' + optimizable.join('|') + ')($|\\W)', 'g');
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precisionOptions.zeroMatcher = new RegExp('(\\d*)(\\.\\d+)(' + optimizable.join('|') + ')', 'g');
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}
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return precisionOptions;
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}
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function buildVariableOptimizers(options) {
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return options.level[OptimizationLevel.One].variableValueOptimizers.map(function(optimizer) {
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if (typeof (optimizer) == 'string') {
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return optimizers[optimizer] || noopValueOptimizer;
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}
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return optimizer;
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});
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}
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function level1Optimize(tokens, context) {
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var options = context.options;
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var levelOptions = options.level[OptimizationLevel.One];
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var ie7Hack = options.compatibility.selectors.ie7Hack;
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var adjacentSpace = options.compatibility.selectors.adjacentSpace;
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var spaceAfterClosingBrace = options.compatibility.properties.spaceAfterClosingBrace;
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var format = options.format;
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var mayHaveCharset = false;
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var afterRules = false;
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options.unitsRegexp = options.unitsRegexp || buildUnitRegexp(options);
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options.precision = options.precision || buildPrecisionOptions(levelOptions.roundingPrecision);
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options.commentsKept = options.commentsKept || 0;
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options.variableOptimizers = options.variableOptimizers || buildVariableOptimizers(options);
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for (var i = 0, l = tokens.length; i < l; i++) {
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var token = tokens[i];
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switch (token[0]) {
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case Token.AT_RULE:
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token[1] = isImport(token) && afterRules ? '' : token[1];
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token[1] = levelOptions.tidyAtRules ? tidyAtRule(token[1]) : token[1];
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mayHaveCharset = true;
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break;
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case Token.AT_RULE_BLOCK:
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optimizeBody(token[1], token[2], context);
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afterRules = true;
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break;
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case Token.NESTED_BLOCK:
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token[1] = levelOptions.tidyBlockScopes ? tidyBlock(token[1], spaceAfterClosingBrace) : token[1];
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level1Optimize(token[2], context);
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afterRules = true;
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break;
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case Token.COMMENT:
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optimizeComment(token, options);
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break;
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case Token.RULE:
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token[1] = levelOptions.tidySelectors
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? tidyRules(token[1], !ie7Hack, adjacentSpace, format, context.warnings)
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: token[1];
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token[1] = token[1].length > 1 ? sortSelectors(token[1], levelOptions.selectorsSortingMethod) : token[1];
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optimizeBody(token[1], token[2], context);
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afterRules = true;
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break;
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}
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if (token[0] == Token.COMMENT
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&& token[1].length === 0
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|| levelOptions.removeEmpty
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&& (token[1].length === 0 || (token[2] && token[2].length === 0))) {
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tokens.splice(i, 1);
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i--;
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l--;
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}
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}
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if (levelOptions.cleanupCharsets && mayHaveCharset) {
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cleanupCharsets(tokens);
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}
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return tokens;
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}
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module.exports = level1Optimize;
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