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585 lines
16 KiB
585 lines
16 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 { DomGenerator } from '../dom/index';
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import Block from '../dom/Block';
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import createDebuggingComment from '../../utils/createDebuggingComment';
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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: Node;
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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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destructuredContexts: string[];
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children: Node[];
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else?: ElseBlock;
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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(`${this.var}_blocks`);
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const { dependencies } = this.metadata;
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block.addDependencies(dependencies);
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const indexNames = new Map(block.indexNames);
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const indexName =
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this.index || block.getUniqueName(`${this.context}_index`);
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indexNames.set(this.context, indexName);
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const listNames = new Map(block.listNames);
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const listName = block.getUniqueName(
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(this.expression.type === 'MemberExpression' && !this.expression.computed) ? this.expression.property.name :
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this.expression.type === 'Identifier' ? this.expression.name :
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`each_value`
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);
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listNames.set(this.context, listName);
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const context = block.getUniqueName(this.context);
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const contexts = new Map(block.contexts);
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contexts.set(this.context, context);
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const indexes = new Map(block.indexes);
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if (this.index) indexes.set(this.index, this.context);
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const changeableIndexes = new Map(block.changeableIndexes);
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if (this.index) changeableIndexes.set(this.index, this.key);
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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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contexts.set(this.destructuredContexts[i], `${context}[${i}]`);
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}
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}
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this.block = block.child({
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comment: createDebuggingComment(this, this.generator),
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name: this.generator.getUniqueName('create_each_block'),
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context: this.context,
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key: this.key,
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contexts,
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indexes,
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changeableIndexes,
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listName,
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indexName,
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indexNames,
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listNames,
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params: block.params.concat(listName, context, indexName),
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});
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this.generator.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.generator),
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name: this.generator.getUniqueName(`${this.block.name}_else`),
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});
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this.generator.blocks.push(this.else.block);
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this.else.initChildren(
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this.else.block,
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stripWhitespace,
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nextSibling
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);
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this.else.block.hasUpdateMethod = this.else.block.dependencies.size > 0;
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}
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}
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build(
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block: Block,
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parentNode: string,
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parentNodes: string
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) {
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const { generator } = this;
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const each = this.var;
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const create_each_block = this.block.name;
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const each_block_value = this.block.listName;
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const iterations = this.iterations;
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const params = block.params.join(', ');
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const needsAnchor = this.next ? !this.next.isDomNode() : !parentNode || !this.parent.isDomNode();
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const anchor = needsAnchor
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? block.getUniqueName(`${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 + 3;
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while (generator.source[c] !== 'e') c += 1;
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generator.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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params,
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anchor,
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mountOrIntro,
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};
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block.contextualise(this.expression);
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const { snippet } = this.metadata;
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block.builders.init.addLine(`var ${each_block_value} = ${snippet};`);
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if (this.key) {
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this.buildKeyed(block, parentNode, parentNodes, snippet, vars);
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} else {
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this.buildUnkeyed(block, parentNode, parentNodes, snippet, vars);
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}
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if (needsAnchor) {
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block.addElement(
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anchor,
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`@createComment()`,
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parentNodes && `@createComment()`,
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parentNode
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);
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}
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if (this.else) {
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const each_block_else = generator.getUniqueName(`${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} = ${this.else.block.name}(${params}, #component);
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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, ${params} );
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} else if (!${each_block_value}.${length}) {
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${each_block_else} = ${this.else.block.name}(${params}, #component);
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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} = ${this.else.block.name}(${params}, #component);
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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}) ${each_block_else}.d();
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`);
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}
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this.children.forEach((child: Node) => {
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child.build(this.block, null, 'nodes');
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});
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if (this.else) {
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this.else.children.forEach((child: Node) => {
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child.build(this.else.block, null, 'nodes');
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});
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}
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}
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buildKeyed(
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block: Block,
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parentNode: string,
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parentNodes: string,
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snippet: string,
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{
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each,
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create_each_block,
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each_block_value,
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length,
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params,
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anchor,
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mountOrIntro,
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}
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) {
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const key = block.getUniqueName('key');
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const lookup = block.getUniqueName(`${each}_lookup`);
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const iteration = block.getUniqueName(`${each}_iteration`);
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const head = block.getUniqueName(`${each}_head`);
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const last = block.getUniqueName(`${each}_last`);
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const expected = block.getUniqueName(`${each}_expected`);
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block.addVariable(lookup, `@blankObject()`);
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block.addVariable(head);
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block.addVariable(last);
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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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var ${iteration} = ${lookup}[${key}] = ${create_each_block}(${params}, ${each_block_value}, ${each_block_value}[#i], #i, #component, ${key});
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if (${last}) ${last}.next = ${iteration};
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${iteration}.last = ${last};
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${last} = ${iteration};
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if (#i === 0) ${head} = ${iteration};
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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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var ${iteration} = ${head};
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while (${iteration}) {
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${iteration}.c();
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${iteration} = ${iteration}.next;
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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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var ${iteration} = ${head};
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while (${iteration}) {
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${iteration}.l(${parentNodes});
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${iteration} = ${iteration}.next;
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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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var ${iteration} = ${head};
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while (${iteration}) {
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${iteration}.${mountOrIntro}(${initialMountNode}, ${anchorNode});
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${iteration} = ${iteration}.next;
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}
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`);
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const dynamic = this.block.hasUpdateMethod;
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let destroy;
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if (this.block.hasOutroMethod) {
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const fn = block.getUniqueName(`${each}_outro`);
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block.builders.init.addBlock(deindent`
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function ${fn}(iteration) {
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iteration.o(function() {
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iteration.u();
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iteration.d();
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${lookup}[iteration.key] = null;
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});
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}
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`);
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destroy = deindent`
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while (${expected}) {
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${fn}(${expected});
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${expected} = ${expected}.next;
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}
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for (#i = 0; #i < discard_pile.length; #i += 1) {
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if (discard_pile[#i].discard) {
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${fn}(discard_pile[#i]);
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}
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}
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`;
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} else {
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const fn = block.getUniqueName(`${each}_destroy`);
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block.builders.init.addBlock(deindent`
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function ${fn}(iteration) {
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iteration.u();
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iteration.d();
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${lookup}[iteration.key] = null;
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}
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`);
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destroy = deindent`
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while (${expected}) {
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${fn}(${expected});
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${expected} = ${expected}.next;
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}
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for (#i = 0; #i < discard_pile.length; #i += 1) {
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var ${iteration} = discard_pile[#i];
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if (${iteration}.discard) {
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${fn}(${iteration});
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}
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}
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`;
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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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var ${expected} = ${head};
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var ${last} = null;
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var discard_pile = [];
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for (#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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var ${iteration} = ${lookup}[${key}];
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${dynamic &&
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`if (${iteration}) ${iteration}.p(changed, ${params}, ${each_block_value}, ${each_block_value}[#i], #i);`}
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if (${expected}) {
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if (${key} === ${expected}.key) {
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${expected} = ${expected}.next;
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} else {
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if (${iteration}) {
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// probably a deletion
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while (${expected} && ${expected}.key !== ${key}) {
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${expected}.discard = true;
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discard_pile.push(${expected});
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${expected} = ${expected}.next;
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};
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${expected} = ${expected} && ${expected}.next;
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${iteration}.discard = false;
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${iteration}.last = ${last};
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if (!${expected}) ${iteration}.m(${updateMountNode}, ${anchor});
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} else {
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// key is being inserted
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${iteration} = ${lookup}[${key}] = ${create_each_block}(${params}, ${each_block_value}, ${each_block_value}[#i], #i, #component, ${key});
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${iteration}.c();
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${iteration}.${mountOrIntro}(${updateMountNode}, ${expected}.first);
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${expected}.last = ${iteration};
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${iteration}.next = ${expected};
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}
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}
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} else {
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// we're appending from this point forward
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if (${iteration}) {
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${iteration}.discard = false;
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${iteration}.next = null;
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${iteration}.m(${updateMountNode}, ${anchor});
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} else {
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${iteration} = ${lookup}[${key}] = ${create_each_block}(${params}, ${each_block_value}, ${each_block_value}[#i], #i, #component, ${key});
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${iteration}.c();
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${iteration}.${mountOrIntro}(${updateMountNode}, ${anchor});
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}
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}
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if (${last}) ${last}.next = ${iteration};
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${iteration}.last = ${last};
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${this.block.hasIntroMethod && `${iteration}.i(${updateMountNode}, ${anchor});`}
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${last} = ${iteration};
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}
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if (${last}) ${last}.next = null;
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${destroy}
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${head} = ${lookup}[${each_block_value}[0] && ${each_block_value}[0].${this.key}];
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`);
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if (!parentNode) {
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block.builders.unmount.addBlock(deindent`
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var ${iteration} = ${head};
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while (${iteration}) {
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${iteration}.u();
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${iteration} = ${iteration}.next;
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}
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`);
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}
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block.builders.destroy.addBlock(deindent`
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var ${iteration} = ${head};
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while (${iteration}) {
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${iteration}.d();
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${iteration} = ${iteration}.next;
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}
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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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params,
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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] = ${create_each_block}(${params}, ${each_block_value}, ${each_block_value}[#i], #i, #component);
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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}, ${anchorNode});
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}
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`);
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const allDependencies = new Set(this.block.dependencies);
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const { dependencies } = this.metadata;
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dependencies.forEach((dependency: string) => {
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allDependencies.add(dependency);
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});
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// TODO do this for keyed blocks as well
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const condition = Array.from(allDependencies)
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.map(dependency => `changed.${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, ${params}, ${each_block_value}, ${each_block_value}[#i], #i);
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} else {
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${iterations}[#i] = ${create_each_block}(${params}, ${each_block_value}, ${each_block_value}[#i], #i, #component);
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${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, ${params}, ${each_block_value}, ${each_block_value}[#i], #i);
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} else {
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${iterations}[#i] = ${create_each_block}(${params}, ${each_block_value}, ${each_block_value}[#i], #i, #component);
|
|
${iterations}[#i].c();
|
|
${iterations}[#i].m(${updateMountNode}, ${anchor});
|
|
}
|
|
`
|
|
: deindent`
|
|
${iterations}[#i] = ${create_each_block}(${params}, ${each_block_value}, ${each_block_value}[#i], #i, #component);
|
|
${iterations}[#i].c();
|
|
${iterations}[#i].${mountOrIntro}(${updateMountNode}, ${anchor});
|
|
`;
|
|
|
|
const start = this.block.hasUpdateMethod ? '0' : `${iterations}.length`;
|
|
|
|
const outro = block.getUniqueName('outro');
|
|
const destroy = this.block.hasOutroMethod
|
|
? deindent`
|
|
function ${outro}(i) {
|
|
if (${iterations}[i]) {
|
|
${iterations}[i].o(function() {
|
|
${iterations}[i].u();
|
|
${iterations}[i].d();
|
|
${iterations}[i] = null;
|
|
});
|
|
}
|
|
}
|
|
|
|
for (; #i < ${iterations}.length; #i += 1) ${outro}(#i);
|
|
`
|
|
: deindent`
|
|
for (; #i < ${iterations}.length; #i += 1) {
|
|
${iterations}[#i].u();
|
|
${iterations}[#i].d();
|
|
}
|
|
${iterations}.length = ${each_block_value}.${length};
|
|
`;
|
|
|
|
block.builders.update.addBlock(deindent`
|
|
var ${each_block_value} = ${snippet};
|
|
|
|
if (${condition}) {
|
|
for (var #i = ${start}; #i < ${each_block_value}.${length}; #i += 1) {
|
|
${forLoopBody}
|
|
}
|
|
|
|
${destroy}
|
|
}
|
|
`);
|
|
}
|
|
|
|
block.builders.unmount.addBlock(deindent`
|
|
for (var #i = 0; #i < ${iterations}.length; #i += 1) {
|
|
${iterations}[#i].u();
|
|
}
|
|
`);
|
|
|
|
block.builders.destroy.addBlock(`@destroyEach(${iterations});`);
|
|
}
|
|
}
|