mirror of https://github.com/sveltejs/svelte
Rich Harris
8 years ago
parent
b3dc57d18d
commit
4639b8d349
@ -0,0 +1,224 @@
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import MagicString from 'magic-string';
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import { walk } from 'estree-walker';
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import { getLocator } from 'locate-character';
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import Selector from './Selector';
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import getCodeFrame from '../utils/getCodeFrame';
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import { Node, Parsed } from '../interfaces';
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class Rule {
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selectors: Selector[];
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declarations: Node[];
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constructor(node: Node) {
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this.selectors = node.selector.children.map((node: Node) => new Selector(node));
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this.declarations = node.block.children;
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}
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apply(node: Node, stack: Node[]) {
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this.selectors.forEach(selector => selector.apply(node, stack)); // TODO move the logic in here?
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}
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transform(code: MagicString, id: string, keyframes: Map<string, string>, cascade: boolean) {
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const attr = `[${id}]`;
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if (cascade) {
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this.selectors.forEach(selector => {
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// TODO disable cascading (without :global(...)) in v2
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const { start, end, children } = selector.node;
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const css = code.original;
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const selectorString = css.slice(start, end);
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const firstToken = children[0];
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let transformed;
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if (firstToken.type === 'TypeSelector') {
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const insert = firstToken.end;
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const head = firstToken.name === '*' ? '' : css.slice(start, insert);
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const tail = css.slice(insert, end);
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transformed = `${head}${attr}${tail}, ${attr} ${selectorString}`;
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} else {
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transformed = `${attr}${selectorString}, ${attr} ${selectorString}`;
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}
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code.overwrite(start, end, transformed);
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});
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} else {
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this.selectors.forEach(selector => selector.transform(code, attr));
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}
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this.declarations.forEach((declaration: Node) => {
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const property = declaration.property.toLowerCase();
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if (property === 'animation' || property === 'animation-name') {
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declaration.value.children.forEach((block: Node) => {
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if (block.type === 'Identifier') {
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const name = block.name;
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if (keyframes.has(name)) {
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code.overwrite(block.start, block.end, keyframes.get(name));
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}
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}
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});
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}
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});
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}
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}
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class Atrule {
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node: Node;
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constructor(node: Node) {
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this.node = node;
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}
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transform(code: MagicString, id: string, keyframes: Map<string, string>) {
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if (this.node.name !== 'keyframes') return;
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this.node.expression.children.forEach((expression: Node) => {
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if (expression.type === 'Identifier') {
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if (expression.name.startsWith('-global-')) {
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code.remove(expression.start, expression.start + 8);
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} else {
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const newName = `${id}-${expression.name}`;
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code.overwrite(expression.start, expression.end, newName);
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keyframes.set(expression.name, newName);
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}
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}
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});
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}
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}
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const keys = {};
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export default class Stylesheet {
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source: string;
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parsed: Parsed;
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cascade: boolean;
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filename: string;
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hasStyles: boolean;
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id: string;
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nodes: (Rule|Atrule)[];
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rules: Rule[];
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atrules: Atrule[];
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constructor(source: string, parsed: Parsed, filename: string, cascade: boolean) {
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this.source = source;
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this.parsed = parsed;
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this.cascade = cascade;
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this.filename = filename;
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this.id = `svelte-${parsed.hash}`;
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this.nodes = [];
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this.rules = [];
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this.atrules = [];
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if (parsed.css && parsed.css.children.length) {
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this.hasStyles = true;
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const stack: Atrule[] = [];
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let currentAtrule: Atrule = null;
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walk(this.parsed.css, {
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enter: (node: Node) => {
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if (node.type === 'Atrule') {
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const atrule = currentAtrule = new Atrule(node);
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stack.push(atrule);
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this.nodes.push(atrule);
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this.atrules.push(atrule);
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}
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if (node.type === 'Rule' && (!currentAtrule || /(media|supports|document)/.test(currentAtrule.node.name))) {
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const rule = new Rule(node);
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this.nodes.push(rule);
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this.rules.push(rule);
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}
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},
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leave: (node: Node) => {
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if (node.type === 'Atrule') {
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stack.pop();
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currentAtrule = stack[stack.length - 1];
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}
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}
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});
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} else {
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this.hasStyles = false;
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}
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}
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apply(node: Node, stack: Node[]) {
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if (!this.hasStyles) return;
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if (this.cascade) {
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if (stack.length === 0) node._needsCssAttribute = true;
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return;
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}
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for (let i = 0; i < this.rules.length; i += 1) {
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const rule = this.rules[i];
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rule.apply(node, stack);
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}
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}
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render(cssOutputFilename) {
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if (!this.hasStyles) {
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return { css: null, cssMap: null };
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}
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const code = new MagicString(this.source);
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code.remove(0, this.parsed.css.start + 7);
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code.remove(this.parsed.css.end - 8, this.source.length);
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const keyframes = new Map();
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this.atrules.forEach((atrule: Atrule) => {
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atrule.transform(code, this.id, keyframes);
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});
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this.rules.forEach((rule: Rule) => {
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rule.transform(code, this.id, keyframes, this.cascade);
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});
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return {
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css: code.toString(),
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cssMap: code.generateMap({
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includeContent: true,
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source: this.filename,
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file: cssOutputFilename
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})
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};
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}
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warnOnUnusedSelectors(onwarn) {
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if (this.cascade) return;
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let locator;
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this.rules.forEach((rule: Rule) => {
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rule.selectors.forEach(selector => {
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if (!selector.used) {
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const pos = selector.node.start;
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if (!locator) locator = getLocator(this.source);
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const { line, column } = locator(pos);
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const frame = getCodeFrame(this.source, line, column);
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const message = `Unused CSS selector`;
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onwarn({
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message,
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frame,
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loc: { line: line + 1, column },
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pos,
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filename: this.filename,
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toString: () => `${message} (${line + 1}:${column})\n${frame}`,
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});
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}
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});
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});
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}
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}
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@ -0,0 +1,7 @@
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<p class='foo'>red</p>
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<style>
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.foo {
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color: red;
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}
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</style>
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@ -0,0 +1,6 @@
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[svelte-2772200924].foo, [svelte-2772200924] .foo {
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color: red;
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}
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/*# sourceMappingURL=output.css.map */
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@ -0,0 +1,12 @@
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{
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"version": 3,
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"file": "output.css",
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"sources": [
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"input.html"
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],
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"sourcesContent": [
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"<p class='foo'>red</p>\n\n<style>\n\t.foo {\n\t\tcolor: red;\n\t}\n</style>"
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],
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"names": [],
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"mappings": "AAEO;CACN,iDAAI;;;AAGL"
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}
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@ -0,0 +1,17 @@
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export function test ({ assert, smcCss, locateInSource, locateInGeneratedCss }) {
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const expected = locateInSource( '.foo' );
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const loc = locateInGeneratedCss( '.foo' );
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const actual = smcCss.originalPositionFor({
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line: loc.line + 1,
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column: loc.column
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});
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assert.deepEqual( actual, {
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source: 'input.html',
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name: null,
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line: expected.line + 1,
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column: expected.column
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});
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}
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