mirror of https://github.com/sveltejs/svelte
621 lines
18 KiB
621 lines
18 KiB
import Renderer from '../Renderer';
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import Block from '../Block';
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import Wrapper from './shared/Wrapper';
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import create_debugging_comment from './shared/create_debugging_comment';
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import EachBlock from '../../nodes/EachBlock';
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import FragmentWrapper from './Fragment';
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import { b, x } from 'code-red';
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import ElseBlock from '../../nodes/ElseBlock';
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import { Identifier, Node } from 'estree';
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import get_object from '../../utils/get_object';
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export class ElseBlockWrapper extends Wrapper {
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node: ElseBlock;
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block: Block;
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fragment: FragmentWrapper;
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is_dynamic: boolean;
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var = null;
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constructor(
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renderer: Renderer,
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block: Block,
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parent: Wrapper,
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node: ElseBlock,
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strip_whitespace: boolean,
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next_sibling: Wrapper
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) {
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super(renderer, block, parent, node);
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this.block = block.child({
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comment: create_debugging_comment(node, this.renderer.component),
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name: this.renderer.component.get_unique_name(`create_else_block`),
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type: 'else'
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});
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this.fragment = new FragmentWrapper(
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renderer,
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this.block,
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this.node.children,
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parent,
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strip_whitespace,
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next_sibling
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);
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this.is_dynamic = this.block.dependencies.size > 0;
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}
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}
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export default class EachBlockWrapper extends Wrapper {
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block: Block;
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node: EachBlock;
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fragment: FragmentWrapper;
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else?: ElseBlockWrapper;
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vars: {
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create_each_block: Identifier;
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each_block_value: Identifier;
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get_each_context: Identifier;
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iterations: Identifier;
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fixed_length: number;
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data_length: string;
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view_length: string;
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}
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context_props: Array<Node | Node[]>;
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index_name: Identifier;
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updates: Array<Node | Node[]> = [];
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dependencies: Set<string>;
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var: Identifier = { type: 'Identifier', name: 'each' };
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constructor(
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renderer: Renderer,
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block: Block,
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parent: Wrapper,
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node: EachBlock,
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strip_whitespace: boolean,
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next_sibling: Wrapper
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) {
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super(renderer, block, parent, node);
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this.cannot_use_innerhtml();
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this.not_static_content();
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const { dependencies } = node.expression;
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block.add_dependencies(dependencies);
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this.node.contexts.forEach(context => {
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renderer.add_to_context(context.key.name, true);
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});
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this.block = block.child({
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comment: create_debugging_comment(this.node, this.renderer.component),
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name: renderer.component.get_unique_name('create_each_block'),
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type: 'each',
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// @ts-ignore todo: probably error
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key: node.key as string,
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bindings: new Map(block.bindings)
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});
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// TODO this seems messy
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this.block.has_animation = this.node.has_animation;
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this.index_name = this.node.index
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? { type: 'Identifier', name: this.node.index }
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: renderer.component.get_unique_name(`${this.node.context}_index`);
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const fixed_length =
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node.expression.node.type === 'ArrayExpression' &&
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node.expression.node.elements.every(element => element.type !== 'SpreadElement')
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? node.expression.node.elements.length
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: null;
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// hack the sourcemap, so that if data is missing the bug
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// is easy to find
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let c = this.node.start + 2;
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while (renderer.component.source[c] !== 'e') c += 1;
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const start = renderer.component.locate(c);
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const end = { line: start.line, column: start.column + 4 };
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const length = {
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type: 'Identifier',
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name: 'length',
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loc: { start, end }
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};
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const each_block_value = renderer.component.get_unique_name(`${this.var.name}_value`);
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const iterations = block.get_unique_name(`${this.var.name}_blocks`);
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renderer.add_to_context(each_block_value.name, true);
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renderer.add_to_context(this.index_name.name, true);
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this.vars = {
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create_each_block: this.block.name,
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each_block_value,
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get_each_context: renderer.component.get_unique_name(`get_${this.var.name}_context`),
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iterations,
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// optimisation for array literal
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fixed_length,
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data_length: fixed_length === null ? x`${each_block_value}.${length}` : fixed_length,
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view_length: fixed_length === null ? x`${iterations}.length` : fixed_length
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};
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const object = get_object(node.expression.node);
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const store = object.type === 'Identifier' && object.name[0] === '$' ? object.name.slice(1) : null;
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node.contexts.forEach(prop => {
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this.block.bindings.set(prop.key.name, {
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object: this.vars.each_block_value,
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property: this.index_name,
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modifier: prop.modifier,
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snippet: prop.modifier(x`${this.vars.each_block_value}[${this.index_name}]` as Node),
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store,
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tail: prop.modifier(x`[${this.index_name}]` as Node)
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});
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});
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if (this.node.index) {
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this.block.get_unique_name(this.node.index); // this prevents name collisions (#1254)
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}
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renderer.blocks.push(this.block);
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this.fragment = new FragmentWrapper(renderer, this.block, node.children, this, strip_whitespace, next_sibling);
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if (this.node.else) {
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this.else = new ElseBlockWrapper(
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renderer,
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block,
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this,
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this.node.else,
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strip_whitespace,
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next_sibling
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);
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renderer.blocks.push(this.else.block);
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if (this.else.is_dynamic) {
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this.block.add_dependencies(this.else.block.dependencies);
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}
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}
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block.add_dependencies(this.block.dependencies);
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if (this.block.has_outros || (this.else && this.else.block.has_outros)) {
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block.add_outro();
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}
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}
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render(block: Block, parent_node: Identifier, parent_nodes: Identifier) {
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if (this.fragment.nodes.length === 0) return;
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const { renderer } = this;
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const { component } = renderer;
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const needs_anchor = this.next
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? !this.next.is_dom_node() :
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!parent_node || !this.parent.is_dom_node();
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this.context_props = this.node.contexts.map(prop => b`child_ctx[${renderer.context_lookup.get(prop.key.name).index}] = ${prop.modifier(x`list[i]`)};`);
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if (this.node.has_binding) this.context_props.push(b`child_ctx[${renderer.context_lookup.get(this.vars.each_block_value.name).index}] = list;`);
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if (this.node.has_binding || this.node.has_index_binding || this.node.index) this.context_props.push(b`child_ctx[${renderer.context_lookup.get(this.index_name.name).index}] = i;`);
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const snippet = this.node.expression.manipulate(block);
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block.chunks.init.push(b`let ${this.vars.each_block_value} = ${snippet};`);
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if (this.renderer.options.dev) {
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block.chunks.init.push(b`@validate_each_argument(${this.vars.each_block_value});`);
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}
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// TODO which is better — Object.create(array) or array.slice()?
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renderer.blocks.push(b`
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function ${this.vars.get_each_context}(#ctx, list, i) {
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const child_ctx = #ctx.slice();
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${this.context_props}
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return child_ctx;
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}
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`);
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const initial_anchor_node: Identifier = { type: 'Identifier', name: parent_node ? 'null' : '#anchor' };
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const initial_mount_node: Identifier = parent_node || { type: 'Identifier', name: '#target' };
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const update_anchor_node = needs_anchor
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? block.get_unique_name(`${this.var.name}_anchor`)
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: (this.next && this.next.var) || { type: 'Identifier', name: 'null' };
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const update_mount_node: Identifier = this.get_update_mount_node((update_anchor_node as Identifier));
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const args = {
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block,
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parent_node,
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parent_nodes,
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snippet,
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initial_anchor_node,
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initial_mount_node,
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update_anchor_node,
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update_mount_node
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};
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const all_dependencies = new Set(this.block.dependencies); // TODO should be dynamic deps only
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this.node.expression.dynamic_dependencies().forEach((dependency: string) => {
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all_dependencies.add(dependency);
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});
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this.dependencies = all_dependencies;
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if (this.node.key) {
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this.render_keyed(args);
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} else {
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this.render_unkeyed(args);
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}
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if (this.block.has_intro_method || this.block.has_outro_method) {
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block.chunks.intro.push(b`
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for (let #i = 0; #i < ${this.vars.data_length}; #i += 1) {
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@transition_in(${this.vars.iterations}[#i]);
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}
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`);
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}
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if (needs_anchor) {
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block.add_element(
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update_anchor_node as Identifier,
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x`@empty()`,
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parent_nodes && x`@empty()`,
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parent_node
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);
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}
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if (this.else) {
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const each_block_else = component.get_unique_name(`${this.var.name}_else`);
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block.chunks.init.push(b`let ${each_block_else} = null;`);
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// TODO neaten this up... will end up with an empty line in the block
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block.chunks.init.push(b`
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if (!${this.vars.data_length}) {
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${each_block_else} = ${this.else.block.name}(#ctx);
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}
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`);
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block.chunks.create.push(b`
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if (${each_block_else}) {
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${each_block_else}.c();
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}
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`);
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if (this.renderer.options.hydratable) {
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block.chunks.claim.push(b`
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if (${each_block_else}) {
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${each_block_else}.l(${parent_nodes});
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}
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`);
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}
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block.chunks.mount.push(b`
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if (${each_block_else}) {
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${each_block_else}.m(${initial_mount_node}, ${initial_anchor_node});
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}
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`);
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const has_transitions = !!(this.else.block.has_intro_method || this.else.block.has_outro_method);
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const destroy_block_else = this.else.block.has_outro_method
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? b`
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@group_outros();
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@transition_out(${each_block_else}, 1, 1, () => {
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${each_block_else} = null;
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});
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@check_outros();`
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: b`
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${each_block_else}.d(1);
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${each_block_else} = null;`;
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if (this.else.block.has_update_method) {
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this.updates.push(b`
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if (!${this.vars.data_length} && ${each_block_else}) {
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${each_block_else}.p(#ctx, #dirty);
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} else if (!${this.vars.data_length}) {
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${each_block_else} = ${this.else.block.name}(#ctx);
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${each_block_else}.c();
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${has_transitions && b`@transition_in(${each_block_else}, 1);`}
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${each_block_else}.m(${update_mount_node}, ${update_anchor_node});
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} else if (${each_block_else}) {
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${destroy_block_else};
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}
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`);
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} else {
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this.updates.push(b`
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if (${this.vars.data_length}) {
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if (${each_block_else}) {
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${destroy_block_else};
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}
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} else if (!${each_block_else}) {
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${each_block_else} = ${this.else.block.name}(#ctx);
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${each_block_else}.c();
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${has_transitions && b`@transition_in(${each_block_else}, 1);`}
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${each_block_else}.m(${update_mount_node}, ${update_anchor_node});
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}
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`);
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}
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block.chunks.destroy.push(b`
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if (${each_block_else}) ${each_block_else}.d(${parent_node ? '' : 'detaching'});
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`);
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}
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if (this.updates.length) {
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block.chunks.update.push(b`
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if (${block.renderer.dirty(Array.from(all_dependencies))}) {
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${this.updates}
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}
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`);
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}
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this.fragment.render(this.block, null, x`#nodes` as Identifier);
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if (this.else) {
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this.else.fragment.render(this.else.block, null, x`#nodes` as Identifier);
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}
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}
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render_keyed({
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block,
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parent_node,
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parent_nodes,
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snippet,
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initial_anchor_node,
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initial_mount_node,
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update_anchor_node,
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update_mount_node
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}: {
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block: Block;
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parent_node: Identifier;
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parent_nodes: Identifier;
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snippet: Node;
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initial_anchor_node: Identifier;
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initial_mount_node: Identifier;
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update_anchor_node: Identifier;
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update_mount_node: Identifier;
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}) {
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const {
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create_each_block,
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iterations,
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data_length,
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view_length
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} = this.vars;
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const get_key = block.get_unique_name('get_key');
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const lookup = block.get_unique_name(`${this.var.name}_lookup`);
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block.add_variable(iterations, x`[]`);
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block.add_variable(lookup, x`new @_Map()`);
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if (this.fragment.nodes[0].is_dom_node()) {
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this.block.first = this.fragment.nodes[0].var;
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} else {
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this.block.first = this.block.get_unique_name('first');
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this.block.add_element(
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this.block.first,
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x`@empty()`,
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parent_nodes && x`@empty()`,
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null
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);
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}
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block.chunks.init.push(b`
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const ${get_key} = #ctx => ${this.node.key.manipulate(block)};
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${this.renderer.options.dev && b`@validate_each_keys(#ctx, ${this.vars.each_block_value}, ${this.vars.get_each_context}, ${get_key});`}
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for (let #i = 0; #i < ${data_length}; #i += 1) {
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let child_ctx = ${this.vars.get_each_context}(#ctx, ${this.vars.each_block_value}, #i);
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let key = ${get_key}(child_ctx);
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${lookup}.set(key, ${iterations}[#i] = ${create_each_block}(key, child_ctx));
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}
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`);
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block.chunks.create.push(b`
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for (let #i = 0; #i < ${view_length}; #i += 1) {
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${iterations}[#i].c();
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}
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`);
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if (parent_nodes && this.renderer.options.hydratable) {
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block.chunks.claim.push(b`
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for (let #i = 0; #i < ${view_length}; #i += 1) {
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${iterations}[#i].l(${parent_nodes});
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}
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`);
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}
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block.chunks.mount.push(b`
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for (let #i = 0; #i < ${view_length}; #i += 1) {
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${iterations}[#i].m(${initial_mount_node}, ${initial_anchor_node});
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}
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`);
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const dynamic = this.block.has_update_method;
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const destroy = this.node.has_animation
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? (this.block.has_outros
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? `@fix_and_outro_and_destroy_block`
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: `@fix_and_destroy_block`)
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: this.block.has_outros
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? `@outro_and_destroy_block`
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: `@destroy_block`;
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if (this.dependencies.size) {
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this.updates.push(b`
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const ${this.vars.each_block_value} = ${snippet};
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${this.renderer.options.dev && b`@validate_each_argument(${this.vars.each_block_value});`}
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${this.block.has_outros && b`@group_outros();`}
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${this.node.has_animation && b`for (let #i = 0; #i < ${view_length}; #i += 1) ${iterations}[#i].r();`}
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${this.renderer.options.dev && b`@validate_each_keys(#ctx, ${this.vars.each_block_value}, ${this.vars.get_each_context}, ${get_key});`}
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${iterations} = @update_keyed_each(${iterations}, #dirty, ${get_key}, ${dynamic ? 1 : 0}, #ctx, ${this.vars.each_block_value}, ${lookup}, ${update_mount_node}, ${destroy}, ${create_each_block}, ${update_anchor_node}, ${this.vars.get_each_context});
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${this.node.has_animation && b`for (let #i = 0; #i < ${view_length}; #i += 1) ${iterations}[#i].a();`}
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${this.block.has_outros && b`@check_outros();`}
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`);
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}
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if (this.block.has_outros) {
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block.chunks.outro.push(b`
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for (let #i = 0; #i < ${view_length}; #i += 1) {
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@transition_out(${iterations}[#i]);
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}
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`);
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}
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block.chunks.destroy.push(b`
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for (let #i = 0; #i < ${view_length}; #i += 1) {
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${iterations}[#i].d(${parent_node ? null : 'detaching'});
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}
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`);
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}
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render_unkeyed({
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block,
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parent_nodes,
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snippet,
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initial_anchor_node,
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initial_mount_node,
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update_anchor_node,
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update_mount_node
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}: {
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block: Block;
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parent_nodes: Identifier;
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snippet: Node;
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initial_anchor_node: Identifier;
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initial_mount_node: Identifier;
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update_anchor_node: Identifier;
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update_mount_node: Identifier;
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}) {
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const {
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create_each_block,
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iterations,
|
|
fixed_length,
|
|
data_length,
|
|
view_length
|
|
} = this.vars;
|
|
|
|
block.chunks.init.push(b`
|
|
let ${iterations} = [];
|
|
|
|
for (let #i = 0; #i < ${data_length}; #i += 1) {
|
|
${iterations}[#i] = ${create_each_block}(${this.vars.get_each_context}(#ctx, ${this.vars.each_block_value}, #i));
|
|
}
|
|
`);
|
|
|
|
block.chunks.create.push(b`
|
|
for (let #i = 0; #i < ${view_length}; #i += 1) {
|
|
${iterations}[#i].c();
|
|
}
|
|
`);
|
|
|
|
if (parent_nodes && this.renderer.options.hydratable) {
|
|
block.chunks.claim.push(b`
|
|
for (let #i = 0; #i < ${view_length}; #i += 1) {
|
|
${iterations}[#i].l(${parent_nodes});
|
|
}
|
|
`);
|
|
}
|
|
|
|
block.chunks.mount.push(b`
|
|
for (let #i = 0; #i < ${view_length}; #i += 1) {
|
|
${iterations}[#i].m(${initial_mount_node}, ${initial_anchor_node});
|
|
}
|
|
`);
|
|
|
|
if (this.dependencies.size) {
|
|
const has_transitions = !!(this.block.has_intro_method || this.block.has_outro_method);
|
|
|
|
const for_loop_body = this.block.has_update_method
|
|
? b`
|
|
if (${iterations}[#i]) {
|
|
${iterations}[#i].p(child_ctx, #dirty);
|
|
${has_transitions && b`@transition_in(${this.vars.iterations}[#i], 1);`}
|
|
} else {
|
|
${iterations}[#i] = ${create_each_block}(child_ctx);
|
|
${iterations}[#i].c();
|
|
${has_transitions && b`@transition_in(${this.vars.iterations}[#i], 1);`}
|
|
${iterations}[#i].m(${update_mount_node}, ${update_anchor_node});
|
|
}
|
|
`
|
|
: has_transitions
|
|
? b`
|
|
if (${iterations}[#i]) {
|
|
@transition_in(${this.vars.iterations}[#i], 1);
|
|
} else {
|
|
${iterations}[#i] = ${create_each_block}(child_ctx);
|
|
${iterations}[#i].c();
|
|
@transition_in(${this.vars.iterations}[#i], 1);
|
|
${iterations}[#i].m(${update_mount_node}, ${update_anchor_node});
|
|
}
|
|
`
|
|
: b`
|
|
if (!${iterations}[#i]) {
|
|
${iterations}[#i] = ${create_each_block}(child_ctx);
|
|
${iterations}[#i].c();
|
|
${iterations}[#i].m(${update_mount_node}, ${update_anchor_node});
|
|
}
|
|
`;
|
|
|
|
const start = this.block.has_update_method ? 0 : `#old_length`;
|
|
|
|
let remove_old_blocks;
|
|
|
|
if (this.block.has_outros) {
|
|
const out = block.get_unique_name('out');
|
|
|
|
block.chunks.init.push(b`
|
|
const ${out} = i => @transition_out(${iterations}[i], 1, 1, () => {
|
|
${iterations}[i] = null;
|
|
});
|
|
`);
|
|
remove_old_blocks = b`
|
|
@group_outros();
|
|
for (#i = ${data_length}; #i < ${view_length}; #i += 1) {
|
|
${out}(#i);
|
|
}
|
|
@check_outros();
|
|
`;
|
|
} else {
|
|
remove_old_blocks = b`
|
|
for (${this.block.has_update_method ? null : x`#i = ${data_length}`}; #i < ${this.block.has_update_method ? view_length : '#old_length'}; #i += 1) {
|
|
${iterations}[#i].d(1);
|
|
}
|
|
${!fixed_length && b`${view_length} = ${data_length};`}
|
|
`;
|
|
}
|
|
|
|
// We declare `i` as block scoped here, as the `remove_old_blocks` code
|
|
// may rely on continuing where this iteration stopped.
|
|
const update = b`
|
|
${!this.block.has_update_method && b`const #old_length = ${this.vars.each_block_value}.length;`}
|
|
${this.vars.each_block_value} = ${snippet};
|
|
${this.renderer.options.dev && b`@validate_each_argument(${this.vars.each_block_value});`}
|
|
|
|
let #i;
|
|
for (#i = ${start}; #i < ${data_length}; #i += 1) {
|
|
const child_ctx = ${this.vars.get_each_context}(#ctx, ${this.vars.each_block_value}, #i);
|
|
|
|
${for_loop_body}
|
|
}
|
|
|
|
${remove_old_blocks}
|
|
`;
|
|
|
|
this.updates.push(update);
|
|
}
|
|
|
|
if (this.block.has_outros) {
|
|
block.chunks.outro.push(b`
|
|
${iterations} = ${iterations}.filter(@_Boolean);
|
|
for (let #i = 0; #i < ${view_length}; #i += 1) {
|
|
@transition_out(${iterations}[#i]);
|
|
}
|
|
`);
|
|
}
|
|
|
|
block.chunks.destroy.push(b`@destroy_each(${iterations}, detaching);`);
|
|
}
|
|
}
|