mirror of https://github.com/sveltejs/svelte
Rich Harris
7 years ago
commit
7401590fba
@ -0,0 +1,188 @@
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import attributeLookup from './lookup';
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import deindent from '../../../../utils/deindent';
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import { stringify } from '../../../../utils/stringify';
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import getExpressionPrecedence from '../../../../utils/getExpressionPrecedence';
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import getStaticAttributeValue from '../../../shared/getStaticAttributeValue';
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import { DomGenerator } from '../../index';
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import Block from '../../Block';
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import { Node } from '../../../../interfaces';
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import { State } from '../../interfaces';
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export interface StyleProp {
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key: string;
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value: Node[];
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}
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export default function visitStyleAttribute(
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generator: DomGenerator,
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block: Block,
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state: State,
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node: Node,
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attribute: Node,
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styleProps: StyleProp[]
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) {
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styleProps.forEach((prop: StyleProp) => {
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let value;
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if (isDynamic(prop.value)) {
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const allDependencies = new Set();
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let shouldCache;
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let hasChangeableIndex;
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value =
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((prop.value.length === 1 || prop.value[0].type === 'Text') ? '' : `"" + `) +
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prop.value
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.map((chunk: Node) => {
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if (chunk.type === 'Text') {
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return stringify(chunk.data);
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} else {
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const { snippet, dependencies, indexes } = block.contextualise(chunk.expression);
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if (Array.from(indexes).some(index => block.changeableIndexes.get(index))) {
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hasChangeableIndex = true;
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}
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dependencies.forEach(d => {
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allDependencies.add(d);
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});
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return getExpressionPrecedence(chunk.expression) <= 13 ? `( ${snippet} )` : snippet;
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}
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})
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.join(' + ');
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if (allDependencies.size || hasChangeableIndex) {
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const dependencies = Array.from(allDependencies);
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const condition = (
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( block.hasOutroMethod ? `#outroing || ` : '' ) +
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dependencies.map(dependency => `changed.${dependency}`).join(' || ')
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);
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block.builders.update.addConditional(
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condition,
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`@setStyle(${node.var}, '${prop.key}', ${value});`
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);
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}
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} else {
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value = stringify(prop.value[0].data);
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}
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block.builders.hydrate.addLine(
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`@setStyle(${node.var}, '${prop.key}', ${value});`
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);
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});
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}
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export function optimizeStyle(value: Node[]) {
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let expectingKey = true;
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let i = 0;
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const props: { key: string, value: Node[] }[] = [];
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let chunks = value.slice();
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while (chunks.length) {
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const chunk = chunks[0];
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if (chunk.type !== 'Text') return null;
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const keyMatch = /^\s*([\w-]+):\s*/.exec(chunk.data);
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if (!keyMatch) return null;
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const key = keyMatch[1];
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const offset = keyMatch.index + keyMatch[0].length;
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const remainingData = chunk.data.slice(offset);
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if (remainingData) {
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chunks[0] = {
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start: chunk.start + offset,
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end: chunk.end,
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type: 'Text',
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data: remainingData
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};
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} else {
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chunks.shift();
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}
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const result = getStyleValue(chunks);
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if (!result) return null;
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props.push({ key, value: result.value });
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chunks = result.chunks;
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}
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return props;
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}
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function getStyleValue(chunks: Node[]) {
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const value: Node[] = [];
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let inUrl = false;
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let quoteMark = null;
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let escaped = false;
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while (chunks.length) {
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const chunk = chunks.shift();
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if (chunk.type === 'Text') {
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let c = 0;
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while (c < chunk.data.length) {
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const char = chunk.data[c];
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if (escaped) {
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escaped = false;
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} else if (char === '\\') {
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escaped = true;
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} else if (char === quoteMark) {
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quoteMark === null;
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} else if (char === '"' || char === "'") {
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quoteMark = char;
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} else if (char === ')' && inUrl) {
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inUrl = false;
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} else if (char === 'u' && chunk.data.slice(c, c + 4) === 'url(') {
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inUrl = true;
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} else if (char === ';' && !inUrl && !quoteMark) {
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break;
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}
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c += 1;
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}
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if (c > 0) {
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value.push({
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type: 'Text',
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start: chunk.start,
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end: chunk.start + c,
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data: chunk.data.slice(0, c)
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});
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}
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while (/[;\s]/.test(chunk.data[c])) c += 1;
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const remainingData = chunk.data.slice(c);
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if (remainingData) {
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chunks.unshift({
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start: chunk.start + c,
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end: chunk.end,
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type: 'Text',
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data: remainingData
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});
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break;
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}
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}
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else {
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value.push(chunk);
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}
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}
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return {
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chunks,
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value
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};
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}
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function isDynamic(value: Node[]) {
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return value.length > 1 || value[0].type !== 'Text';
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}
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@ -0,0 +1,53 @@
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import { Node } from '../interfaces';
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const binaryOperators: Record<string, number> = {
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'**': 15,
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'*': 14,
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'/': 14,
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'%': 14,
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'+': 13,
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'-': 13,
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'<<': 12,
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'>>': 12,
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'>>>': 12,
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'<': 11,
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'<=': 11,
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'>': 11,
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'>=': 11,
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'in': 11,
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'instanceof': 11,
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'==': 10,
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'!=': 10,
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'===': 10,
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'!==': 10,
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'&': 9,
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'^': 8,
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'|': 7
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};
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const logicalOperators: Record<string, number> = {
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'&&': 6,
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'||': 5
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};
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const precedence: Record<string, (expression?: Node) => number> = {
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Literal: () => 21,
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Identifier: () => 21,
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ParenthesizedExpression: () => 20,
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MemberExpression: () => 19,
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NewExpression: () => 19, // can be 18 (if no args) but makes no practical difference
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CallExpression: () => 19,
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UpdateExpression: () => 17,
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UnaryExpression: () => 16,
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BinaryExpression: (expression: Node) => binaryOperators[expression.operator],
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LogicalExpression: (expression: Node) => logicalOperators[expression.operator],
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ConditionalExpression: () => 4,
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AssignmentExpression: () => 3,
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YieldExpression: () => 2,
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SpreadElement: () => 1,
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SequenceExpression: () => 0
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};
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export default function getExpressionPrecedence(expression: Node) {
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return expression.type in precedence ? precedence[expression.type](expression) : 0;
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}
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@ -0,0 +1 @@
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<div style='color: {{color}}; transform: translate({{x}}px,{{y}}px);'></div>
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@ -0,0 +1 @@
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<div style='background: url(data:image/png;base64,{{data}})'></div>
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@ -0,0 +1 @@
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<div style='color: {{color}}'></div>
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@ -0,0 +1,2 @@
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<div style='{{style}}'></div>
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<div style='{{key}}: {{value}}'></div>
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