308 lines
11 KiB
JavaScript
308 lines
11 KiB
JavaScript
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'use strict';
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const cssTree = require('css-tree');
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let fingerprintId = 1;
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const dontRestructure = new Set([
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'src' // https://github.com/afelix/csso/issues/50
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]);
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const DONT_MIX_VALUE = {
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// https://developer.mozilla.org/en-US/docs/Web/CSS/display#Browser_compatibility
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'display': /table|ruby|flex|-(flex)?box$|grid|contents|run-in/i,
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// https://developer.mozilla.org/en/docs/Web/CSS/text-align
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'text-align': /^(start|end|match-parent|justify-all)$/i
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};
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const SAFE_VALUES = {
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cursor: [
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'auto', 'crosshair', 'default', 'move', 'text', 'wait', 'help',
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'n-resize', 'e-resize', 's-resize', 'w-resize',
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'ne-resize', 'nw-resize', 'se-resize', 'sw-resize',
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'pointer', 'progress', 'not-allowed', 'no-drop', 'vertical-text', 'all-scroll',
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'col-resize', 'row-resize'
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],
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overflow: [
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'hidden', 'visible', 'scroll', 'auto'
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],
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position: [
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'static', 'relative', 'absolute', 'fixed'
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]
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};
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const NEEDLESS_TABLE = {
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'border-width': ['border'],
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'border-style': ['border'],
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'border-color': ['border'],
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'border-top': ['border'],
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'border-right': ['border'],
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'border-bottom': ['border'],
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'border-left': ['border'],
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'border-top-width': ['border-top', 'border-width', 'border'],
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'border-right-width': ['border-right', 'border-width', 'border'],
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'border-bottom-width': ['border-bottom', 'border-width', 'border'],
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'border-left-width': ['border-left', 'border-width', 'border'],
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'border-top-style': ['border-top', 'border-style', 'border'],
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'border-right-style': ['border-right', 'border-style', 'border'],
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'border-bottom-style': ['border-bottom', 'border-style', 'border'],
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'border-left-style': ['border-left', 'border-style', 'border'],
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'border-top-color': ['border-top', 'border-color', 'border'],
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'border-right-color': ['border-right', 'border-color', 'border'],
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'border-bottom-color': ['border-bottom', 'border-color', 'border'],
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'border-left-color': ['border-left', 'border-color', 'border'],
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'margin-top': ['margin'],
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'margin-right': ['margin'],
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'margin-bottom': ['margin'],
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'margin-left': ['margin'],
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'padding-top': ['padding'],
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'padding-right': ['padding'],
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'padding-bottom': ['padding'],
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'padding-left': ['padding'],
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'font-style': ['font'],
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'font-variant': ['font'],
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'font-weight': ['font'],
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'font-size': ['font'],
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'font-family': ['font'],
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'list-style-type': ['list-style'],
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'list-style-position': ['list-style'],
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'list-style-image': ['list-style']
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};
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function getPropertyFingerprint(propertyName, declaration, fingerprints) {
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const realName = cssTree.property(propertyName).basename;
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if (realName === 'background') {
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return propertyName + ':' + cssTree.generate(declaration.value);
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}
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const declarationId = declaration.id;
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let fingerprint = fingerprints[declarationId];
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if (!fingerprint) {
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switch (declaration.value.type) {
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case 'Value':
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const special = {};
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let vendorId = '';
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let iehack = '';
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let raw = false;
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declaration.value.children.forEach(function walk(node) {
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switch (node.type) {
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case 'Value':
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case 'Brackets':
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case 'Parentheses':
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node.children.forEach(walk);
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break;
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case 'Raw':
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raw = true;
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break;
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case 'Identifier': {
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const { name } = node;
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if (!vendorId) {
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vendorId = cssTree.keyword(name).vendor;
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}
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if (/\\[09]/.test(name)) {
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iehack = RegExp.lastMatch;
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}
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if (SAFE_VALUES.hasOwnProperty(realName)) {
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if (SAFE_VALUES[realName].indexOf(name) === -1) {
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special[name] = true;
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}
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} else if (DONT_MIX_VALUE.hasOwnProperty(realName)) {
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if (DONT_MIX_VALUE[realName].test(name)) {
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special[name] = true;
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}
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}
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break;
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}
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case 'Function': {
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let { name } = node;
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if (!vendorId) {
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vendorId = cssTree.keyword(name).vendor;
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}
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if (name === 'rect') {
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// there are 2 forms of rect:
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// rect(<top>, <right>, <bottom>, <left>) - standart
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// rect(<top> <right> <bottom> <left>) – backwards compatible syntax
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// only the same form values can be merged
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const hasComma = node.children.some((node) =>
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node.type === 'Operator' && node.value === ','
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);
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if (!hasComma) {
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name = 'rect-backward';
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}
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}
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special[name + '()'] = true;
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// check nested tokens too
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node.children.forEach(walk);
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break;
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}
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case 'Dimension': {
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const { unit } = node;
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if (/\\[09]/.test(unit)) {
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iehack = RegExp.lastMatch;
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}
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switch (unit) {
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// is not supported until IE11
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case 'rem':
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// v* units is too buggy across browsers and better
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// don't merge values with those units
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case 'vw':
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case 'vh':
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case 'vmin':
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case 'vmax':
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case 'vm': // IE9 supporting "vm" instead of "vmin".
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special[unit] = true;
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break;
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}
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break;
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}
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}
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});
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fingerprint = raw
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? '!' + fingerprintId++
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: '!' + Object.keys(special).sort() + '|' + iehack + vendorId;
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break;
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case 'Raw':
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fingerprint = '!' + declaration.value.value;
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break;
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default:
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fingerprint = cssTree.generate(declaration.value);
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}
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fingerprints[declarationId] = fingerprint;
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}
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return propertyName + fingerprint;
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}
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function needless(props, declaration, fingerprints) {
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const property = cssTree.property(declaration.property);
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if (NEEDLESS_TABLE.hasOwnProperty(property.basename)) {
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const table = NEEDLESS_TABLE[property.basename];
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for (const entry of table) {
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const ppre = getPropertyFingerprint(property.prefix + entry, declaration, fingerprints);
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const prev = props.hasOwnProperty(ppre) ? props[ppre] : null;
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if (prev && (!declaration.important || prev.item.data.important)) {
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return prev;
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}
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}
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}
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}
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function processRule(rule, item, list, props, fingerprints) {
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const declarations = rule.block.children;
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declarations.forEachRight(function(declaration, declarationItem) {
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const { property } = declaration;
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const fingerprint = getPropertyFingerprint(property, declaration, fingerprints);
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const prev = props[fingerprint];
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if (prev && !dontRestructure.has(property)) {
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if (declaration.important && !prev.item.data.important) {
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props[fingerprint] = {
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block: declarations,
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item: declarationItem
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};
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prev.block.remove(prev.item);
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// TODO: use it when we can refer to several points in source
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// declaration.loc = {
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// primary: declaration.loc,
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// merged: prev.item.data.loc
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// };
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} else {
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declarations.remove(declarationItem);
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// TODO: use it when we can refer to several points in source
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// prev.item.data.loc = {
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// primary: prev.item.data.loc,
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// merged: declaration.loc
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// };
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}
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} else {
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const prev = needless(props, declaration, fingerprints);
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if (prev) {
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declarations.remove(declarationItem);
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// TODO: use it when we can refer to several points in source
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// prev.item.data.loc = {
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// primary: prev.item.data.loc,
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// merged: declaration.loc
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// };
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} else {
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declaration.fingerprint = fingerprint;
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props[fingerprint] = {
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block: declarations,
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item: declarationItem
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};
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}
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}
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});
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if (declarations.isEmpty) {
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list.remove(item);
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}
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}
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function restructBlock(ast) {
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const stylesheetMap = {};
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const fingerprints = Object.create(null);
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cssTree.walk(ast, {
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visit: 'Rule',
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reverse: true,
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enter(node, item, list) {
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const stylesheet = this.block || this.stylesheet;
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const ruleId = (node.pseudoSignature || '') + '|' + node.prelude.children.first.id;
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let ruleMap;
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let props;
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if (!stylesheetMap.hasOwnProperty(stylesheet.id)) {
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ruleMap = {};
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stylesheetMap[stylesheet.id] = ruleMap;
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} else {
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ruleMap = stylesheetMap[stylesheet.id];
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}
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if (ruleMap.hasOwnProperty(ruleId)) {
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props = ruleMap[ruleId];
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} else {
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props = {};
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ruleMap[ruleId] = props;
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}
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processRule.call(this, node, item, list, props, fingerprints);
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}
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});
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}
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module.exports = restructBlock;
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