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676 lines
20 KiB
676 lines
20 KiB
var shortenHex = require('./shorten-hex');
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var shortenHsl = require('./shorten-hsl');
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var shortenRgb = require('./shorten-rgb');
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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 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 split = require('../../utils/split');
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var serializeRules = require('../../writer/one-time').rules;
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var IgnoreProperty = 'ignore-property';
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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 WHOLE_PIXEL_VALUE = /(?:^|\s|\()(-?\d+)px/;
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var TIME_VALUE = /^(\-?[\d\.]+)(m?s)$/;
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var HEX_VALUE_PATTERN = /[0-9a-f]/i;
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var PROPERTY_NAME_PATTERN = /^(?:\-chrome\-|\-[\w\-]+\w|\w[\w\-]+\w|\-\-\S+)$/;
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var IMPORT_PREFIX_PATTERN = /^@import/i;
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var QUOTED_PATTERN = /^('.*'|".*")$/;
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var QUOTED_BUT_SAFE_PATTERN = /^['"][a-zA-Z][a-zA-Z\d\-_]+['"]$/;
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var URL_PREFIX_PATTERN = /^url\(/i;
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var VARIABLE_NAME_PATTERN = /^--\S+$/;
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function isNegative(value) {
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return value && value[1][0] == '-' && parseFloat(value[1]) < 0;
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}
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function isQuoted(value) {
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return QUOTED_PATTERN.test(value);
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}
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function isUrl(value) {
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return URL_PREFIX_PATTERN.test(value);
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}
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function normalizeUrl(value) {
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return value
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.replace(URL_PREFIX_PATTERN, 'url(')
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.replace(/\\?\n|\\?\r\n/g, '');
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}
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function optimizeBackground(property) {
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var values = property.value;
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if (values.length == 1 && values[0][1] == 'none') {
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values[0][1] = '0 0';
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}
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if (values.length == 1 && values[0][1] == 'transparent') {
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values[0][1] = '0 0';
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}
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}
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function optimizeBorderRadius(property) {
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var values = property.value;
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var spliceAt;
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if (values.length == 3 && values[1][1] == '/' && values[0][1] == values[2][1]) {
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spliceAt = 1;
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} else if (values.length == 5 && values[2][1] == '/' && values[0][1] == values[3][1] && values[1][1] == values[4][1]) {
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spliceAt = 2;
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} else if (values.length == 7 && values[3][1] == '/' && values[0][1] == values[4][1] && values[1][1] == values[5][1] && values[2][1] == values[6][1]) {
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spliceAt = 3;
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} else if (values.length == 9 && values[4][1] == '/' && values[0][1] == values[5][1] && values[1][1] == values[6][1] && values[2][1] == values[7][1] && values[3][1] == values[8][1]) {
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spliceAt = 4;
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}
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if (spliceAt) {
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property.value.splice(spliceAt);
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property.dirty = true;
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}
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}
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function optimizeColors(name, value, compatibility) {
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if (value.indexOf('#') === -1 && value.indexOf('rgb') == -1 && value.indexOf('hsl') == -1) {
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return shortenHex(value);
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}
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value = value
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.replace(/rgb\((\-?\d+),(\-?\d+),(\-?\d+)\)/g, function (match, red, green, blue) {
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return shortenRgb(red, green, blue);
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})
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.replace(/hsl\((-?\d+),(-?\d+)%?,(-?\d+)%?\)/g, function (match, hue, saturation, lightness) {
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return shortenHsl(hue, saturation, lightness);
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})
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.replace(/(^|[^='"])#([0-9a-f]{6})/gi, function (match, prefix, color, at, inputValue) {
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var suffix = inputValue[at + match.length];
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if (suffix && HEX_VALUE_PATTERN.test(suffix)) {
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return match;
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} else if (color[0] == color[1] && color[2] == color[3] && color[4] == color[5]) {
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return (prefix + '#' + color[0] + color[2] + color[4]).toLowerCase();
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} else {
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return (prefix + '#' + color).toLowerCase();
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}
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})
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.replace(/(^|[^='"])#([0-9a-f]{3})/gi, function (match, prefix, color) {
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return prefix + '#' + color.toLowerCase();
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})
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.replace(/(rgb|rgba|hsl|hsla)\(([^\)]+)\)/g, function (match, colorFunction, colorDef) {
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var tokens = colorDef.split(',');
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var applies = (colorFunction == 'hsl' && tokens.length == 3) ||
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(colorFunction == 'hsla' && tokens.length == 4) ||
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(colorFunction == 'rgb' && tokens.length == 3 && colorDef.indexOf('%') > 0) ||
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(colorFunction == 'rgba' && tokens.length == 4 && colorDef.indexOf('%') > 0);
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if (!applies) {
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return match;
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}
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if (tokens[1].indexOf('%') == -1) {
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tokens[1] += '%';
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}
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if (tokens[2].indexOf('%') == -1) {
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tokens[2] += '%';
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}
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return colorFunction + '(' + tokens.join(',') + ')';
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});
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if (compatibility.colors.opacity && name.indexOf('background') == -1) {
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value = value.replace(/(?:rgba|hsla)\(0,0%?,0%?,0\)/g, function (match) {
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if (split(value, ',').pop().indexOf('gradient(') > -1) {
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return match;
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}
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return 'transparent';
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});
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}
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return shortenHex(value);
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}
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function optimizeFilter(property) {
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if (property.value.length == 1) {
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property.value[0][1] = property.value[0][1].replace(/progid:DXImageTransform\.Microsoft\.(Alpha|Chroma)(\W)/, function (match, filter, suffix) {
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return filter.toLowerCase() + suffix;
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});
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}
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property.value[0][1] = property.value[0][1]
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.replace(/,(\S)/g, ', $1')
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.replace(/ ?= ?/g, '=');
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}
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function optimizeFontWeight(property, atIndex) {
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var value = property.value[atIndex][1];
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if (value == 'normal') {
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value = '400';
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} else if (value == 'bold') {
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value = '700';
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}
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property.value[atIndex][1] = value;
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}
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function optimizeMultipleZeros(property) {
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var values = property.value;
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var spliceAt;
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if (values.length == 4 && values[0][1] === '0' && values[1][1] === '0' && values[2][1] === '0' && values[3][1] === '0') {
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if (property.name.indexOf('box-shadow') > -1) {
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spliceAt = 2;
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} else {
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spliceAt = 1;
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}
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}
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if (spliceAt) {
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property.value.splice(spliceAt);
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property.dirty = true;
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}
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}
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function optimizeOutline(property) {
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var values = property.value;
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if (values.length == 1 && values[0][1] == 'none') {
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values[0][1] = '0';
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}
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}
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function optimizePixelLengths(_, value, compatibility) {
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if (!WHOLE_PIXEL_VALUE.test(value)) {
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return value;
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}
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return value.replace(WHOLE_PIXEL_VALUE, function (match, val) {
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var newValue;
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var intVal = parseInt(val);
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if (intVal === 0) {
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return match;
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}
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if (compatibility.properties.shorterLengthUnits && compatibility.units.pt && intVal * 3 % 4 === 0) {
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newValue = intVal * 3 / 4 + 'pt';
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}
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if (compatibility.properties.shorterLengthUnits && compatibility.units.pc && intVal % 16 === 0) {
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newValue = intVal / 16 + 'pc';
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}
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if (compatibility.properties.shorterLengthUnits && compatibility.units.in && intVal % 96 === 0) {
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newValue = intVal / 96 + 'in';
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}
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if (newValue) {
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newValue = match.substring(0, match.indexOf(val)) + newValue;
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}
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return newValue && newValue.length < match.length ? newValue : match;
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});
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}
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function optimizePrecision(_, value, precisionOptions) {
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if (!precisionOptions.enabled || value.indexOf('.') === -1) {
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return value;
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}
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return value
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.replace(precisionOptions.decimalPointMatcher, '$1$2$3')
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.replace(precisionOptions.zeroMatcher, function (match, integerPart, fractionPart, unit) {
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var multiplier = precisionOptions.units[unit].multiplier;
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var parsedInteger = parseInt(integerPart);
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var integer = isNaN(parsedInteger) ? 0 : parsedInteger;
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var fraction = parseFloat(fractionPart);
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return Math.round((integer + fraction) * multiplier) / multiplier + unit;
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});
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}
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function optimizeTimeUnits(_, value) {
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if (!TIME_VALUE.test(value))
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return value;
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return value.replace(TIME_VALUE, function (match, val, unit) {
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var newValue;
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if (unit == 'ms') {
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newValue = parseInt(val) / 1000 + 's';
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} else if (unit == 's') {
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newValue = parseFloat(val) * 1000 + 'ms';
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}
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return newValue.length < match.length ? newValue : match;
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});
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}
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function optimizeUnits(name, value, unitsRegexp) {
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if (/^(?:\-moz\-calc|\-webkit\-calc|calc|rgb|hsl|rgba|hsla)\(/.test(value)) {
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return value;
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}
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if (name == 'flex' || name == '-ms-flex' || name == '-webkit-flex' || name == 'flex-basis' || name == '-webkit-flex-basis') {
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return value;
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}
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if (value.indexOf('%') > 0 && (name == 'height' || name == 'max-height' || name == 'width' || name == 'max-width')) {
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return value;
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}
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return value
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.replace(unitsRegexp, '$1' + '0' + '$2')
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.replace(unitsRegexp, '$1' + '0' + '$2');
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}
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function optimizeWhitespace(name, value) {
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if (name.indexOf('filter') > -1 || value.indexOf(' ') == -1 || value.indexOf('expression') === 0) {
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return value;
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}
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if (value.indexOf(Marker.SINGLE_QUOTE) > -1 || value.indexOf(Marker.DOUBLE_QUOTE) > -1) {
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return value;
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}
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value = value.replace(/\s+/g, ' ');
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if (value.indexOf('calc') > -1) {
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value = value.replace(/\) ?\/ ?/g, ')/ ');
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}
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return value
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.replace(/(\(;?)\s+/g, '$1')
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.replace(/\s+(;?\))/g, '$1')
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.replace(/, /g, ',');
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}
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function optimizeZeroDegUnit(_, value) {
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if (value.indexOf('0deg') == -1) {
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return value;
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}
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return value.replace(/\(0deg\)/g, '(0)');
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}
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function optimizeZeroUnits(name, value) {
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if (value.indexOf('0') == -1) {
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return value;
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}
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if (value.indexOf('-') > -1) {
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value = value
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.replace(/([^\w\d\-]|^)\-0([^\.]|$)/g, '$10$2')
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.replace(/([^\w\d\-]|^)\-0([^\.]|$)/g, '$10$2');
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}
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return value
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.replace(/(^|\s)0+([1-9])/g, '$1$2')
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.replace(/(^|\D)\.0+(\D|$)/g, '$10$2')
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.replace(/(^|\D)\.0+(\D|$)/g, '$10$2')
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.replace(/\.([1-9]*)0+(\D|$)/g, function (match, nonZeroPart, suffix) {
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return (nonZeroPart.length > 0 ? '.' : '') + nonZeroPart + suffix;
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})
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.replace(/(^|\D)0\.(\d)/g, '$1.$2');
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}
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function removeQuotes(name, value) {
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if (name == 'content' || name.indexOf('font-variation-settings') > -1 || name.indexOf('font-feature-settings') > -1 || name.indexOf('grid-') > -1) {
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return value;
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}
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return QUOTED_BUT_SAFE_PATTERN.test(value) ?
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value.substring(1, value.length - 1) :
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value;
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}
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function removeUrlQuotes(value) {
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return /^url\(['"].+['"]\)$/.test(value) && !/^url\(['"].*[\*\s\(\)'"].*['"]\)$/.test(value) && !/^url\(['"]data:[^;]+;charset/.test(value) ?
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value.replace(/["']/g, '') :
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value;
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}
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function transformValue(propertyName, propertyValue, rule, transformCallback) {
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var selector = serializeRules(rule);
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var transformedValue = transformCallback(propertyName, propertyValue, selector);
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if (transformedValue === undefined) {
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return propertyValue;
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} else if (transformedValue === false) {
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return IgnoreProperty;
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} else {
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return transformedValue;
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}
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}
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//
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function optimizeBody(rule, properties, context) {
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var options = context.options;
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var levelOptions = options.level[OptimizationLevel.One];
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var property, name, type, value;
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var valueIsUrl;
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var propertyToken;
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var _properties = wrapForOptimizing(properties, true);
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propertyLoop:
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for (var i = 0, l = _properties.length; i < l; i++) {
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property = _properties[i];
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name = property.name;
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if (!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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}
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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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}
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if (property.hack && (
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(property.hack[0] == Hack.ASTERISK || property.hack[0] == Hack.UNDERSCORE) && !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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}
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if (levelOptions.removeNegativePaddings && name.indexOf('padding') === 0 && (isNegative(property.value[0]) || isNegative(property.value[1]) || isNegative(property.value[2]) || isNegative(property.value[3]))) {
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property.unused = true;
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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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}
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if (property.unused) {
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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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if (VARIABLE_NAME_PATTERN.test(name)) {
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continue;
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}
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for (var 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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valueIsUrl = isUrl(value);
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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 (valueIsUrl && !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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if (valueIsUrl) {
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value = levelOptions.normalizeUrls ?
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normalizeUrl(value) :
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value;
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value = !options.compatibility.properties.urlQuotes ?
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removeUrlQuotes(value) :
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value;
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} else if (isQuoted(value)) {
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value = levelOptions.removeQuotes ?
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removeQuotes(name, value) :
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value;
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} else {
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value = levelOptions.removeWhitespace ?
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optimizeWhitespace(name, value) :
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value;
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value = optimizePrecision(name, value, options.precision);
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value = optimizePixelLengths(name, value, options.compatibility);
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value = levelOptions.replaceTimeUnits ?
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optimizeTimeUnits(name, value) :
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value;
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value = levelOptions.replaceZeroUnits ?
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optimizeZeroUnits(name, value) :
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value;
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if (options.compatibility.properties.zeroUnits) {
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value = optimizeZeroDegUnit(name, value);
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value = optimizeUnits(name, value, options.unitsRegexp);
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}
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if (options.compatibility.properties.colors) {
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value = optimizeColors(name, value, options.compatibility);
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}
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}
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value = transformValue(name, value, rule, levelOptions.transform);
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if (value === IgnoreProperty) {
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property.unused = true;
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continue propertyLoop;
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}
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property.value[j][1] = value;
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}
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if (levelOptions.replaceMultipleZeros) {
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optimizeMultipleZeros(property);
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}
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if (name == 'background' && levelOptions.optimizeBackground) {
|
|
optimizeBackground(property);
|
|
} else if (name.indexOf('border') === 0 && name.indexOf('radius') > 0 && levelOptions.optimizeBorderRadius) {
|
|
optimizeBorderRadius(property);
|
|
} else if (name == 'filter'&& levelOptions.optimizeFilter && options.compatibility.properties.ieFilters) {
|
|
optimizeFilter(property);
|
|
} else if (name == 'font-weight' && levelOptions.optimizeFontWeight) {
|
|
optimizeFontWeight(property, 0);
|
|
} else if (name == 'outline' && levelOptions.optimizeOutline) {
|
|
optimizeOutline(property);
|
|
}
|
|
}
|
|
|
|
restoreFromOptimizing(_properties);
|
|
removeUnused(_properties);
|
|
removeComments(properties, options);
|
|
}
|
|
|
|
function removeComments(tokens, options) {
|
|
var token;
|
|
var i;
|
|
|
|
for (i = 0; i < tokens.length; i++) {
|
|
token = tokens[i];
|
|
|
|
if (token[0] != Token.COMMENT) {
|
|
continue;
|
|
}
|
|
|
|
optimizeComment(token, options);
|
|
|
|
if (token[1].length === 0) {
|
|
tokens.splice(i, 1);
|
|
i--;
|
|
}
|
|
}
|
|
}
|
|
|
|
function optimizeComment(token, options) {
|
|
if (token[1][2] == Marker.EXCLAMATION && (options.level[OptimizationLevel.One].specialComments == 'all' || options.commentsKept < options.level[OptimizationLevel.One].specialComments)) {
|
|
options.commentsKept++;
|
|
return;
|
|
}
|
|
|
|
token[1] = [];
|
|
}
|
|
|
|
function cleanupCharsets(tokens) {
|
|
var hasCharset = false;
|
|
|
|
for (var i = 0, l = tokens.length; i < l; i++) {
|
|
var token = tokens[i];
|
|
|
|
if (token[0] != Token.AT_RULE)
|
|
continue;
|
|
|
|
if (!CHARSET_REGEXP.test(token[1]))
|
|
continue;
|
|
|
|
if (hasCharset || token[1].indexOf(CHARSET_TOKEN) == -1) {
|
|
tokens.splice(i, 1);
|
|
i--;
|
|
l--;
|
|
} else {
|
|
hasCharset = true;
|
|
tokens.splice(i, 1);
|
|
tokens.unshift([Token.AT_RULE, token[1].replace(CHARSET_REGEXP, CHARSET_TOKEN)]);
|
|
}
|
|
}
|
|
}
|
|
|
|
function buildUnitRegexp(options) {
|
|
var units = ['px', 'em', 'ex', 'cm', 'mm', 'in', 'pt', 'pc', '%'];
|
|
var otherUnits = ['ch', 'rem', 'vh', 'vm', 'vmax', 'vmin', 'vw'];
|
|
|
|
otherUnits.forEach(function (unit) {
|
|
if (options.compatibility.units[unit]) {
|
|
units.push(unit);
|
|
}
|
|
});
|
|
|
|
return new RegExp('(^|\\s|\\(|,)0(?:' + units.join('|') + ')(\\W|$)', 'g');
|
|
}
|
|
|
|
function buildPrecisionOptions(roundingPrecision) {
|
|
var precisionOptions = {
|
|
matcher: null,
|
|
units: {},
|
|
};
|
|
var optimizable = [];
|
|
var unit;
|
|
var value;
|
|
|
|
for (unit in roundingPrecision) {
|
|
value = roundingPrecision[unit];
|
|
|
|
if (value != DEFAULT_ROUNDING_PRECISION) {
|
|
precisionOptions.units[unit] = {};
|
|
precisionOptions.units[unit].value = value;
|
|
precisionOptions.units[unit].multiplier = Math.pow(10, value);
|
|
|
|
optimizable.push(unit);
|
|
}
|
|
}
|
|
|
|
if (optimizable.length > 0) {
|
|
precisionOptions.enabled = true;
|
|
precisionOptions.decimalPointMatcher = new RegExp('(\\d)\\.($|' + optimizable.join('|') + ')($|\W)', 'g');
|
|
precisionOptions.zeroMatcher = new RegExp('(\\d*)(\\.\\d+)(' + optimizable.join('|') + ')', 'g');
|
|
}
|
|
|
|
return precisionOptions;
|
|
}
|
|
|
|
function isImport(token) {
|
|
return IMPORT_PREFIX_PATTERN.test(token[1]);
|
|
}
|
|
|
|
function isLegacyFilter(property) {
|
|
var value;
|
|
|
|
if (property.name == 'filter' || property.name == '-ms-filter') {
|
|
value = property.value[0][1];
|
|
|
|
return value.indexOf('progid') > -1 ||
|
|
value.indexOf('alpha') === 0 ||
|
|
value.indexOf('chroma') === 0;
|
|
} else {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
function level1Optimize(tokens, context) {
|
|
var options = context.options;
|
|
var levelOptions = options.level[OptimizationLevel.One];
|
|
var ie7Hack = options.compatibility.selectors.ie7Hack;
|
|
var adjacentSpace = options.compatibility.selectors.adjacentSpace;
|
|
var spaceAfterClosingBrace = options.compatibility.properties.spaceAfterClosingBrace;
|
|
var format = options.format;
|
|
var mayHaveCharset = false;
|
|
var afterRules = false;
|
|
|
|
options.unitsRegexp = options.unitsRegexp || buildUnitRegexp(options);
|
|
options.precision = options.precision || buildPrecisionOptions(levelOptions.roundingPrecision);
|
|
options.commentsKept = options.commentsKept || 0;
|
|
|
|
for (var i = 0, l = tokens.length; i < l; i++) {
|
|
var token = tokens[i];
|
|
|
|
switch (token[0]) {
|
|
case Token.AT_RULE:
|
|
token[1] = isImport(token) && afterRules ? '' : token[1];
|
|
token[1] = levelOptions.tidyAtRules ? tidyAtRule(token[1]) : token[1];
|
|
mayHaveCharset = true;
|
|
break;
|
|
case Token.AT_RULE_BLOCK:
|
|
optimizeBody(token[1], token[2], context);
|
|
afterRules = true;
|
|
break;
|
|
case Token.NESTED_BLOCK:
|
|
token[1] = levelOptions.tidyBlockScopes ? tidyBlock(token[1], spaceAfterClosingBrace) : token[1];
|
|
level1Optimize(token[2], context);
|
|
afterRules = true;
|
|
break;
|
|
case Token.COMMENT:
|
|
optimizeComment(token, options);
|
|
break;
|
|
case Token.RULE:
|
|
token[1] = levelOptions.tidySelectors ? tidyRules(token[1], !ie7Hack, adjacentSpace, format, context.warnings) : token[1];
|
|
token[1] = token[1].length > 1 ? sortSelectors(token[1], levelOptions.selectorsSortingMethod) : token[1];
|
|
optimizeBody(token[1], token[2], context);
|
|
afterRules = true;
|
|
break;
|
|
}
|
|
|
|
if (token[0] == Token.COMMENT && token[1].length === 0 || levelOptions.removeEmpty && (token[1].length === 0 || (token[2] && token[2].length === 0))) {
|
|
tokens.splice(i, 1);
|
|
i--;
|
|
l--;
|
|
}
|
|
}
|
|
|
|
if (levelOptions.cleanupCharsets && mayHaveCharset) {
|
|
cleanupCharsets(tokens);
|
|
}
|
|
|
|
return tokens;
|
|
}
|
|
|
|
module.exports = level1Optimize;
|