mirror of https://github.com/sveltejs/svelte
476 lines
13 KiB
476 lines
13 KiB
import deindent from '../../utils/deindent';
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import Node from './shared/Node';
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import ElseBlock from './ElseBlock';
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import Block from '../dom/Block';
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import createDebuggingComment from '../../utils/createDebuggingComment';
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import Expression from './shared/Expression';
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import mapChildren from './shared/mapChildren';
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import TemplateScope from '../dom/TemplateScope';
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export default class EachBlock extends Node {
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type: 'EachBlock';
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block: Block;
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expression: Expression;
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iterations: string;
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index: string;
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context: string;
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key: string;
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scope: TemplateScope;
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destructuredContexts: string[];
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children: Node[];
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else?: ElseBlock;
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constructor(compiler, parent, scope, info) {
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super(compiler, parent, scope, info);
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this.expression = new Expression(compiler, this, scope, info.expression);
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this.context = info.context;
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this.index = info.index;
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this.key = info.key;
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this.scope = scope.child();
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this.scope.add(this.context, this.expression.dependencies);
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if (this.index) {
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// index can only change if this is a keyed each block
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const dependencies = this.key ? this.expression.dependencies : [];
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this.scope.add(this.index, dependencies);
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}
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// TODO more general approach to destructuring
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this.destructuredContexts = info.destructuredContexts || [];
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this.destructuredContexts.forEach(name => {
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this.scope.add(name, this.expression.dependencies);
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});
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this.children = mapChildren(compiler, this, this.scope, info.children);
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this.else = info.else
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? new ElseBlock(compiler, this, this.scope, info.else)
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: null;
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}
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init(
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block: Block,
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stripWhitespace: boolean,
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nextSibling: Node
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) {
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this.cannotUseInnerHTML();
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this.var = block.getUniqueName(`each`);
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this.iterations = block.getUniqueName(`${this.var}_blocks`);
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this.each_context = block.getUniqueName(`${this.var}_context`);
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const { dependencies } = this.expression;
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block.addDependencies(dependencies);
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this.block = block.child({
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comment: createDebuggingComment(this, this.compiler),
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name: this.compiler.getUniqueName('create_each_block'),
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key: this.key,
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indexNames: new Map(block.indexNames),
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listNames: new Map(block.listNames)
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});
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const listName = this.compiler.getUniqueName('each_value');
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const indexName = this.index || this.compiler.getUniqueName(`${this.context}_index`);
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this.block.indexNames.set(this.context, indexName);
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this.block.listNames.set(this.context, listName);
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if (this.index) {
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this.block.getUniqueName(this.index); // this prevents name collisions (#1254)
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}
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this.contextProps = [
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`${listName}: ${listName}`,
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`${this.context}: ${listName}[#i]`,
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`${indexName}: #i`
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];
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if (this.destructuredContexts) {
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for (let i = 0; i < this.destructuredContexts.length; i += 1) {
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this.contextProps.push(`${this.destructuredContexts[i]}: ${listName}[#i][${i}]`);
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}
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}
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this.compiler.blocks.push(this.block);
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this.initChildren(this.block, stripWhitespace, nextSibling);
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block.addDependencies(this.block.dependencies);
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this.block.hasUpdateMethod = this.block.dependencies.size > 0;
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if (this.else) {
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this.else.block = block.child({
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comment: createDebuggingComment(this.else, this.compiler),
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name: this.compiler.getUniqueName(`${this.block.name}_else`),
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});
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this.compiler.blocks.push(this.else.block);
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this.else.initChildren(
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this.else.block,
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stripWhitespace,
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nextSibling
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);
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this.else.block.hasUpdateMethod = this.else.block.dependencies.size > 0;
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}
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}
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build(
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block: Block,
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parentNode: string,
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parentNodes: string
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) {
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if (this.children.length === 0) return;
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const { compiler } = this;
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const each = this.var;
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const create_each_block = this.block.name;
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const each_block_value = this.block.listNames.get(this.context);
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const iterations = this.iterations;
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const needsAnchor = this.next ? !this.next.isDomNode() : !parentNode || !this.parent.isDomNode();
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const anchor = needsAnchor
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? block.getUniqueName(`${each}_anchor`)
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: (this.next && this.next.var) || 'null';
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// hack the sourcemap, so that if data is missing the bug
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// is easy to find
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let c = this.start + 2;
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while (compiler.source[c] !== 'e') c += 1;
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compiler.code.overwrite(c, c + 4, 'length');
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const length = `[✂${c}-${c+4}✂]`;
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const mountOrIntro = this.block.hasIntroMethod ? 'i' : 'm';
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const vars = {
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each,
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create_each_block,
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each_block_value,
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length,
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iterations,
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anchor,
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mountOrIntro,
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};
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const { snippet } = this.expression;
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block.builders.init.addLine(`var ${each_block_value} = ${snippet};`);
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if (this.key) {
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this.buildKeyed(block, parentNode, parentNodes, snippet, vars);
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} else {
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this.buildUnkeyed(block, parentNode, parentNodes, snippet, vars);
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}
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if (needsAnchor) {
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block.addElement(
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anchor,
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`@createComment()`,
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parentNodes && `@createComment()`,
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parentNode
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);
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}
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if (this.else) {
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const each_block_else = compiler.getUniqueName(`${each}_else`);
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block.builders.init.addLine(`var ${each_block_else} = null;`);
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// TODO neaten this up... will end up with an empty line in the block
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block.builders.init.addBlock(deindent`
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if (!${each_block_value}.${length}) {
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${each_block_else} = ${this.else.block.name}(#component, ctx);
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${each_block_else}.c();
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}
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`);
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block.builders.mount.addBlock(deindent`
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if (${each_block_else}) {
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${each_block_else}.${mountOrIntro}(${parentNode || '#target'}, null);
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}
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`);
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const initialMountNode = parentNode || `${anchor}.parentNode`;
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if (this.else.block.hasUpdateMethod) {
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block.builders.update.addBlock(deindent`
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if (!${each_block_value}.${length} && ${each_block_else}) {
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${each_block_else}.p(changed, ctx);
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} else if (!${each_block_value}.${length}) {
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${each_block_else} = ${this.else.block.name}(#component, ctx);
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${each_block_else}.c();
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${each_block_else}.${mountOrIntro}(${initialMountNode}, ${anchor});
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} else if (${each_block_else}) {
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${each_block_else}.u();
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${each_block_else}.d();
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${each_block_else} = null;
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}
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`);
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} else {
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block.builders.update.addBlock(deindent`
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if (${each_block_value}.${length}) {
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if (${each_block_else}) {
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${each_block_else}.u();
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${each_block_else}.d();
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${each_block_else} = null;
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}
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} else if (!${each_block_else}) {
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${each_block_else} = ${this.else.block.name}(#component, ctx);
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${each_block_else}.c();
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${each_block_else}.${mountOrIntro}(${initialMountNode}, ${anchor});
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}
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`);
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}
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block.builders.unmount.addLine(
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`if (${each_block_else}) ${each_block_else}.u()`
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);
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block.builders.destroy.addBlock(deindent`
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if (${each_block_else}) ${each_block_else}.d();
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`);
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}
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this.children.forEach((child: Node) => {
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child.build(this.block, null, 'nodes');
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});
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if (this.else) {
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this.else.children.forEach((child: Node) => {
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child.build(this.else.block, null, 'nodes');
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});
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}
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}
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buildKeyed(
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block: Block,
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parentNode: string,
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parentNodes: string,
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snippet: string,
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{
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each,
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create_each_block,
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each_block_value,
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length,
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anchor,
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mountOrIntro,
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}
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) {
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const key = block.getUniqueName('key');
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const blocks = block.getUniqueName(`${each}_blocks`);
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const lookup = block.getUniqueName(`${each}_lookup`);
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block.addVariable(blocks, '[]');
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block.addVariable(lookup, `@blankObject()`);
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if (this.children[0].isDomNode()) {
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this.block.first = this.children[0].var;
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} else {
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this.block.first = this.block.getUniqueName('first');
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this.block.addElement(
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this.block.first,
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`@createComment()`,
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parentNodes && `@createComment()`,
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null
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);
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}
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block.builders.init.addBlock(deindent`
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for (var #i = 0; #i < ${each_block_value}.${length}; #i += 1) {
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var ${key} = ${each_block_value}[#i].${this.key};
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${blocks}[#i] = ${lookup}[${key}] = ${create_each_block}(#component, ${key}, @assign(@assign({}, ctx), {
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${this.contextProps.join(',\n')}
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}));
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}
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`);
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const initialMountNode = parentNode || '#target';
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const updateMountNode = this.getUpdateMountNode(anchor);
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const anchorNode = parentNode ? 'null' : 'anchor';
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block.builders.create.addBlock(deindent`
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for (#i = 0; #i < ${blocks}.length; #i += 1) ${blocks}[#i].c();
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`);
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if (parentNodes) {
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block.builders.claim.addBlock(deindent`
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for (#i = 0; #i < ${blocks}.length; #i += 1) ${blocks}[#i].l(${parentNodes});
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`);
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}
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block.builders.mount.addBlock(deindent`
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for (#i = 0; #i < ${blocks}.length; #i += 1) ${blocks}[#i].${mountOrIntro}(${initialMountNode}, ${anchorNode});
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`);
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const dynamic = this.block.hasUpdateMethod;
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block.builders.update.addBlock(deindent`
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var ${each_block_value} = ${snippet};
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${blocks} = @updateKeyedEach(${blocks}, #component, changed, "${this.key}", ${dynamic ? '1' : '0'}, ${each_block_value}, ${lookup}, ${updateMountNode}, ${String(this.block.hasOutroMethod)}, ${create_each_block}, "${mountOrIntro}", ${anchor}, function(#i) {
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return @assign(@assign({}, ctx), {
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${this.contextProps.join(',\n')}
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});
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});
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`);
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if (!parentNode) {
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block.builders.unmount.addBlock(deindent`
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for (#i = 0; #i < ${blocks}.length; #i += 1) ${blocks}[#i].u();
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`);
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}
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block.builders.destroy.addBlock(deindent`
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for (#i = 0; #i < ${blocks}.length; #i += 1) ${blocks}[#i].d();
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`);
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}
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buildUnkeyed(
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block: Block,
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parentNode: string,
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parentNodes: string,
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snippet: string,
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{
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create_each_block,
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each_block_value,
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length,
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iterations,
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anchor,
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mountOrIntro,
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}
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) {
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block.builders.init.addBlock(deindent`
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var ${iterations} = [];
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for (var #i = 0; #i < ${each_block_value}.${length}; #i += 1) {
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${iterations}[#i] = ${create_each_block}(#component, @assign(@assign({}, ctx), {
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${this.contextProps.join(',\n')}
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}));
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}
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`);
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const initialMountNode = parentNode || '#target';
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const updateMountNode = this.getUpdateMountNode(anchor);
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const anchorNode = parentNode ? 'null' : 'anchor';
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block.builders.create.addBlock(deindent`
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for (var #i = 0; #i < ${iterations}.length; #i += 1) {
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${iterations}[#i].c();
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}
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`);
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if (parentNodes) {
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block.builders.claim.addBlock(deindent`
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for (var #i = 0; #i < ${iterations}.length; #i += 1) {
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${iterations}[#i].l(${parentNodes});
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}
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`);
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}
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block.builders.mount.addBlock(deindent`
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for (var #i = 0; #i < ${iterations}.length; #i += 1) {
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${iterations}[#i].${mountOrIntro}(${initialMountNode}, ${anchorNode});
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}
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`);
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const allDependencies = new Set(this.block.dependencies);
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const { dependencies } = this.expression;
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dependencies.forEach((dependency: string) => {
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allDependencies.add(dependency);
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});
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// TODO do this for keyed blocks as well
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const condition = Array.from(allDependencies)
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.map(dependency => `changed.${dependency}`)
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.join(' || ');
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if (condition !== '') {
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const forLoopBody = this.block.hasUpdateMethod
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? this.block.hasIntroMethod
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? deindent`
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if (${iterations}[#i]) {
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${iterations}[#i].p(changed, ${this.each_context});
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} else {
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${iterations}[#i] = ${create_each_block}(#component, ${this.each_context});
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${iterations}[#i].c();
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}
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${iterations}[#i].i(${updateMountNode}, ${anchor});
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`
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: deindent`
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if (${iterations}[#i]) {
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${iterations}[#i].p(changed, ${this.each_context});
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} else {
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${iterations}[#i] = ${create_each_block}(#component, ${this.each_context});
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${iterations}[#i].c();
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${iterations}[#i].m(${updateMountNode}, ${anchor});
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}
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`
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: deindent`
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${iterations}[#i] = ${create_each_block}(#component, ${this.each_context});
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${iterations}[#i].c();
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${iterations}[#i].${mountOrIntro}(${updateMountNode}, ${anchor});
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`;
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const start = this.block.hasUpdateMethod ? '0' : `${iterations}.length`;
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const outro = block.getUniqueName('outro');
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const destroy = this.block.hasOutroMethod
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? deindent`
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function ${outro}(i) {
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if (${iterations}[i]) {
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${iterations}[i].o(function() {
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${iterations}[i].u();
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${iterations}[i].d();
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${iterations}[i] = null;
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});
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}
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}
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for (; #i < ${iterations}.length; #i += 1) ${outro}(#i);
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`
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: deindent`
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for (; #i < ${iterations}.length; #i += 1) {
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${iterations}[#i].u();
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${iterations}[#i].d();
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}
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${iterations}.length = ${each_block_value}.${length};
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`;
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block.builders.update.addBlock(deindent`
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var ${each_block_value} = ${snippet};
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if (${condition}) {
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for (var #i = ${start}; #i < ${each_block_value}.${length}; #i += 1) {
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var ${this.each_context} = @assign(@assign({}, ctx), {
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${this.contextProps.join(',\n')}
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});
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${forLoopBody}
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}
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${destroy}
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}
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`);
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}
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block.builders.unmount.addBlock(deindent`
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for (var #i = 0; #i < ${iterations}.length; #i += 1) {
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${iterations}[#i].u();
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}
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`);
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block.builders.destroy.addBlock(`@destroyEach(${iterations});`);
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}
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remount(name: string) {
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// TODO consider keyed blocks
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return `for (var #i = 0; #i < ${this.iterations}.length; #i += 1) ${this.iterations}[#i].m(${name}._slotted.default, null);`;
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}
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}
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