mirror of https://github.com/sveltejs/svelte
602 lines
16 KiB
602 lines
16 KiB
import Wrapper from './shared/Wrapper';
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import Renderer from '../Renderer';
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import Block from '../Block';
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import EachBlock from '../../nodes/EachBlock';
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import IfBlock from '../../nodes/IfBlock';
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import create_debugging_comment from './shared/create_debugging_comment';
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import ElseBlock from '../../nodes/ElseBlock';
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import FragmentWrapper from './Fragment';
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import { b, x } from 'code-red';
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import { walk } from 'estree-walker';
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import { is_head } from './shared/is_head';
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import { Identifier, Node, UnaryExpression } from 'estree';
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function is_else_if(node: ElseBlock) {
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return (
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node && node.children.length === 1 && node.children[0].type === 'IfBlock'
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);
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}
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class IfBlockBranch extends Wrapper {
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block: Block;
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fragment: FragmentWrapper;
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dependencies?: string[];
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condition?: any;
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snippet?: Node;
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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: IfBlockWrapper,
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node: IfBlock | 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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const { expression } = (node as IfBlock);
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const is_else = !expression;
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if (expression) {
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this.dependencies = expression.dynamic_dependencies();
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// TODO is this the right rule? or should any non-reference count?
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// const should_cache = !is_reference(expression.node, null) && dependencies.length > 0;
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let should_cache = false;
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walk(expression.node, {
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enter(node) {
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if (node.type === 'CallExpression' || node.type === 'NewExpression') {
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should_cache = true;
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}
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}
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});
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if (should_cache) {
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this.condition = block.get_unique_name(`show_if`);
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this.snippet = (expression.manipulate(block) as Node);
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} else {
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this.condition = expression.manipulate(block);
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}
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}
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this.block = block.child({
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comment: create_debugging_comment(node, parent.renderer.component),
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name: parent.renderer.component.get_unique_name(
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is_else ? `create_else_block` : `create_if_block`
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),
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type: (node as IfBlock).expression ? 'if' : 'else'
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});
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this.fragment = new FragmentWrapper(renderer, this.block, node.children, parent, strip_whitespace, next_sibling);
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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 IfBlockWrapper extends Wrapper {
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node: IfBlock;
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branches: IfBlockBranch[];
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needs_update = false;
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var: Identifier = { type: 'Identifier', name: 'if_block' };
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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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this.branches = [];
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const blocks: Block[] = [];
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let is_dynamic = false;
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let has_intros = false;
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let has_outros = false;
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const create_branches = (node: IfBlock) => {
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const branch = new IfBlockBranch(
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renderer,
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block,
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this,
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node,
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strip_whitespace,
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next_sibling
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);
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this.branches.push(branch);
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blocks.push(branch.block);
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block.add_dependencies(node.expression.dependencies);
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if (branch.block.dependencies.size > 0) {
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// the condition, or its contents, is dynamic
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is_dynamic = true;
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block.add_dependencies(branch.block.dependencies);
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}
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if (branch.dependencies && branch.dependencies.length > 0) {
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// the condition itself is dynamic
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this.needs_update = true;
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}
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if (branch.block.has_intros) has_intros = true;
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if (branch.block.has_outros) has_outros = true;
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if (is_else_if(node.else)) {
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create_branches(node.else.children[0] as IfBlock);
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} else if (node.else) {
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const branch = new IfBlockBranch(
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renderer,
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block,
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this,
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node.else,
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strip_whitespace,
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next_sibling
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);
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this.branches.push(branch);
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blocks.push(branch.block);
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if (branch.block.dependencies.size > 0) {
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is_dynamic = true;
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block.add_dependencies(branch.block.dependencies);
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}
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if (branch.block.has_intros) has_intros = true;
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if (branch.block.has_outros) has_outros = true;
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}
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};
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create_branches(this.node);
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blocks.forEach(block => {
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block.has_update_method = is_dynamic;
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block.has_intro_method = has_intros;
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block.has_outro_method = has_outros;
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});
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renderer.blocks.push(...blocks);
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}
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render(
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block: Block,
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parent_node: Identifier,
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parent_nodes: Identifier
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) {
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const name = this.var;
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const needs_anchor = this.next ? !this.next.is_dom_node() : !parent_node || !this.parent.is_dom_node();
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const anchor = needs_anchor
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? block.get_unique_name(`${this.var.name}_anchor`)
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: (this.next && this.next.var) || 'null';
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const has_else = !(this.branches[this.branches.length - 1].condition);
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const if_exists_condition = has_else ? null : name;
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const dynamic = this.branches[0].block.has_update_method; // can use [0] as proxy for all, since they necessarily have the same value
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const has_intros = this.branches[0].block.has_intro_method;
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const has_outros = this.branches[0].block.has_outro_method;
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const has_transitions = has_intros || has_outros;
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const vars = { name, anchor, if_exists_condition, has_else, has_transitions };
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const detaching = parent_node && !is_head(parent_node) ? null : 'detaching';
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if (this.node.else) {
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this.branches.forEach(branch => {
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if (branch.snippet) block.add_variable(branch.condition);
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});
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if (has_outros) {
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this.render_compound_with_outros(block, parent_node, parent_nodes, dynamic, vars, detaching);
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block.chunks.outro.push(b`@transition_out(${name});`);
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} else {
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this.render_compound(block, parent_node, parent_nodes, dynamic, vars, detaching);
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}
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} else {
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this.render_simple(block, parent_node, parent_nodes, dynamic, vars, detaching);
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if (has_outros) {
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block.chunks.outro.push(b`@transition_out(${name});`);
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}
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}
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if (if_exists_condition) {
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block.chunks.create.push(b`if (${if_exists_condition}) ${name}.c();`);
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} else {
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block.chunks.create.push(b`${name}.c();`);
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}
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if (parent_nodes && this.renderer.options.hydratable) {
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if (if_exists_condition) {
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block.chunks.claim.push(
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b`if (${if_exists_condition}) ${name}.l(${parent_nodes});`
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);
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} else {
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block.chunks.claim.push(
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b`${name}.l(${parent_nodes});`
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);
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}
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}
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if (has_intros || has_outros) {
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block.chunks.intro.push(b`@transition_in(${name});`);
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}
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if (needs_anchor) {
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block.add_element(
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anchor as Identifier,
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x`@empty()`,
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parent_nodes && x`@empty()`,
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parent_node
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);
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}
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this.branches.forEach(branch => {
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branch.fragment.render(branch.block, null, x`#nodes` as unknown as Identifier);
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});
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}
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render_compound(
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block: Block,
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parent_node: Identifier,
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_parent_nodes: Identifier,
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dynamic,
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{ name, anchor, has_else, if_exists_condition, has_transitions },
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detaching
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) {
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const select_block_type = this.renderer.component.get_unique_name(`select_block_type`);
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const current_block_type = block.get_unique_name(`current_block_type`);
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const get_block = has_else
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? x`${current_block_type}(#ctx)`
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: x`${current_block_type} && ${current_block_type}(#ctx)`;
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if (this.needs_update) {
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block.chunks.init.push(b`
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function ${select_block_type}(#ctx, #dirty) {
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${this.branches.map(({ dependencies, condition, snippet, block }) => condition
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? b`
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${snippet && (
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dependencies.length > 0
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? b`if (${condition} == null || ${block.renderer.dirty(dependencies)}) ${condition} = !!${snippet}`
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: b`if (${condition} == null) ${condition} = !!${snippet}`
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)}
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if (${condition}) return ${block.name};`
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: b`return ${block.name};`)}
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}
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`);
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} else {
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block.chunks.init.push(b`
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function ${select_block_type}(#ctx, #dirty) {
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${this.branches.map(({ condition, snippet, block }) => condition
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? b`if (${snippet || condition}) return ${block.name};`
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: b`return ${block.name};`)}
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}
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`);
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}
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block.chunks.init.push(b`
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let ${current_block_type} = ${select_block_type}(#ctx, ${this.get_initial_dirty_bit()});
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let ${name} = ${get_block};
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`);
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const initial_mount_node = parent_node || '#target';
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const anchor_node = parent_node ? 'null' : 'anchor';
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if (if_exists_condition) {
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block.chunks.mount.push(
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b`if (${if_exists_condition}) ${name}.m(${initial_mount_node}, ${anchor_node});`
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);
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} else {
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block.chunks.mount.push(
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b`${name}.m(${initial_mount_node}, ${anchor_node});`
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);
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}
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if (this.needs_update) {
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const update_mount_node = this.get_update_mount_node(anchor);
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const change_block = b`
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${if_exists_condition ? b`if (${if_exists_condition}) ${name}.d(1)` : b`${name}.d(1)`};
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${name} = ${get_block};
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if (${name}) {
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${name}.c();
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${has_transitions && b`@transition_in(${name}, 1);`}
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${name}.m(${update_mount_node}, ${anchor});
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}
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`;
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if (dynamic) {
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block.chunks.update.push(b`
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if (${current_block_type} === (${current_block_type} = ${select_block_type}(#ctx, #dirty)) && ${name}) {
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${name}.p(#ctx, #dirty);
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} else {
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${change_block}
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}
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`);
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} else {
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block.chunks.update.push(b`
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if (${current_block_type} !== (${current_block_type} = ${select_block_type}(#ctx, #dirty))) {
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${change_block}
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}
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`);
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}
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} else if (dynamic) {
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block.chunks.update.push(b`${name}.p(#ctx, #dirty);`);
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}
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if (if_exists_condition) {
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block.chunks.destroy.push(b`
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if (${if_exists_condition}) {
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${name}.d(${detaching});
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}
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`);
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} else {
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block.chunks.destroy.push(b`
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${name}.d(${detaching});
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`);
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}
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}
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// if any of the siblings have outros, we need to keep references to the blocks
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// (TODO does this only apply to bidi transitions?)
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render_compound_with_outros(
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block: Block,
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parent_node: Identifier,
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_parent_nodes: Identifier,
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dynamic,
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{ name, anchor, has_else, has_transitions },
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detaching
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) {
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const select_block_type = this.renderer.component.get_unique_name(`select_block_type`);
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const current_block_type_index = block.get_unique_name(`current_block_type_index`);
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const previous_block_index = block.get_unique_name(`previous_block_index`);
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const if_block_creators = block.get_unique_name(`if_block_creators`);
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const if_blocks = block.get_unique_name(`if_blocks`);
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const if_current_block_type_index = has_else
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? nodes => nodes
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: nodes => b`if (~${current_block_type_index}) { ${nodes} }`;
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block.add_variable(current_block_type_index);
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block.add_variable(name);
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block.chunks.init.push(b`
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const ${if_block_creators} = [
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${this.branches.map(branch => branch.block.name)}
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];
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const ${if_blocks} = [];
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${this.needs_update
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? b`
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function ${select_block_type}(#ctx, #dirty) {
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${this.branches.map(({ dependencies, condition, snippet }, i) => condition
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? b`
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${snippet && (
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dependencies.length > 0
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? b`if (${block.renderer.dirty(dependencies)}) ${condition} = !!${snippet}`
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: b`if (${condition} == -1) ${condition} = !!${snippet}`
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)}
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if (${condition}) return ${i};`
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: b`return ${i};`)}
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${!has_else && b`return -1;`}
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}
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`
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: b`
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function ${select_block_type}(#ctx, #dirty) {
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${this.branches.map(({ condition, snippet }, i) => condition
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? b`if (${snippet || condition}) return ${i};`
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: b`return ${i};`)}
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${!has_else && b`return -1;`}
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}
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`}
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`);
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if (has_else) {
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block.chunks.init.push(b`
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${current_block_type_index} = ${select_block_type}(#ctx, ${this.get_initial_dirty_bit()});
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${name} = ${if_blocks}[${current_block_type_index}] = ${if_block_creators}[${current_block_type_index}](#ctx);
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`);
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} else {
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block.chunks.init.push(b`
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if (~(${current_block_type_index} = ${select_block_type}(#ctx, ${this.get_initial_dirty_bit()}))) {
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${name} = ${if_blocks}[${current_block_type_index}] = ${if_block_creators}[${current_block_type_index}](#ctx);
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}
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`);
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}
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const initial_mount_node = parent_node || '#target';
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const anchor_node = parent_node ? 'null' : 'anchor';
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block.chunks.mount.push(
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if_current_block_type_index(
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b`${if_blocks}[${current_block_type_index}].m(${initial_mount_node}, ${anchor_node});`
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)
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);
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if (this.needs_update) {
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const update_mount_node = this.get_update_mount_node(anchor);
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const destroy_old_block = b`
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@group_outros();
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@transition_out(${if_blocks}[${previous_block_index}], 1, 1, () => {
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${if_blocks}[${previous_block_index}] = null;
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});
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@check_outros();
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`;
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const create_new_block = b`
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${name} = ${if_blocks}[${current_block_type_index}];
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if (!${name}) {
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${name} = ${if_blocks}[${current_block_type_index}] = ${if_block_creators}[${current_block_type_index}](#ctx);
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${name}.c();
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}
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${has_transitions && b`@transition_in(${name}, 1);`}
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${name}.m(${update_mount_node}, ${anchor});
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`;
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const change_block = has_else
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? b`
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${destroy_old_block}
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${create_new_block}
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`
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: b`
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if (${name}) {
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${destroy_old_block}
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}
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if (~${current_block_type_index}) {
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${create_new_block}
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} else {
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${name} = null;
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}
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`;
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if (dynamic) {
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block.chunks.update.push(b`
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let ${previous_block_index} = ${current_block_type_index};
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${current_block_type_index} = ${select_block_type}(#ctx, #dirty);
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if (${current_block_type_index} === ${previous_block_index}) {
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${if_current_block_type_index(b`${if_blocks}[${current_block_type_index}].p(#ctx, #dirty);`)}
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} else {
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${change_block}
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}
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`);
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} else {
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block.chunks.update.push(b`
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let ${previous_block_index} = ${current_block_type_index};
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${current_block_type_index} = ${select_block_type}(#ctx, #dirty);
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if (${current_block_type_index} !== ${previous_block_index}) {
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${change_block}
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}
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`);
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}
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} else if (dynamic) {
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block.chunks.update.push(b`${name}.p(#ctx, #dirty);`);
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}
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block.chunks.destroy.push(
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if_current_block_type_index(b`${if_blocks}[${current_block_type_index}].d(${detaching});`)
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);
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}
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render_simple(
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block: Block,
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parent_node: Identifier,
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_parent_nodes: Identifier,
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dynamic,
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{ name, anchor, if_exists_condition, has_transitions },
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detaching
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) {
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const branch = this.branches[0];
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if (branch.snippet) block.add_variable(branch.condition, branch.snippet);
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block.chunks.init.push(b`
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let ${name} = ${branch.condition} && ${branch.block.name}(#ctx);
|
|
`);
|
|
|
|
const initial_mount_node = parent_node || '#target';
|
|
const anchor_node = parent_node ? 'null' : 'anchor';
|
|
|
|
block.chunks.mount.push(
|
|
b`if (${name}) ${name}.m(${initial_mount_node}, ${anchor_node});`
|
|
);
|
|
|
|
if (branch.dependencies.length > 0) {
|
|
const update_mount_node = this.get_update_mount_node(anchor);
|
|
|
|
const enter = b`
|
|
if (${name}) {
|
|
${dynamic && b`${name}.p(#ctx, #dirty);`}
|
|
${
|
|
has_transitions &&
|
|
b`if (${block.renderer.dirty(branch.dependencies)}) {
|
|
@transition_in(${name}, 1);
|
|
}`
|
|
}
|
|
} else {
|
|
${name} = ${branch.block.name}(#ctx);
|
|
${name}.c();
|
|
${has_transitions && b`@transition_in(${name}, 1);`}
|
|
${name}.m(${update_mount_node}, ${anchor});
|
|
}
|
|
`;
|
|
|
|
if (branch.snippet) {
|
|
block.chunks.update.push(b`if (${block.renderer.dirty(branch.dependencies)}) ${branch.condition} = ${branch.snippet}`);
|
|
}
|
|
|
|
// no `p()` here — we don't want to update outroing nodes,
|
|
// as that will typically result in glitching
|
|
if (branch.block.has_outro_method) {
|
|
block.chunks.update.push(b`
|
|
if (${branch.condition}) {
|
|
${enter}
|
|
} else if (${name}) {
|
|
@group_outros();
|
|
@transition_out(${name}, 1, 1, () => {
|
|
${name} = null;
|
|
});
|
|
@check_outros();
|
|
}
|
|
`);
|
|
} else {
|
|
block.chunks.update.push(b`
|
|
if (${branch.condition}) {
|
|
${enter}
|
|
} else if (${name}) {
|
|
${name}.d(1);
|
|
${name} = null;
|
|
}
|
|
`);
|
|
}
|
|
} else if (dynamic) {
|
|
block.chunks.update.push(b`
|
|
if (${branch.condition}) ${name}.p(#ctx, #dirty);
|
|
`);
|
|
}
|
|
|
|
if (if_exists_condition) {
|
|
block.chunks.destroy.push(b`
|
|
if (${if_exists_condition}) ${name}.d(${detaching});
|
|
`);
|
|
} else {
|
|
block.chunks.destroy.push(b`
|
|
${name}.d(${detaching});
|
|
`);
|
|
}
|
|
}
|
|
|
|
get_initial_dirty_bit() {
|
|
const _this = this;
|
|
// TODO: context-overflow make it less gross
|
|
const val: UnaryExpression = x`-1` as UnaryExpression;
|
|
return {
|
|
get type() {
|
|
return _this.renderer.context_overflow ? 'ArrayExpression' : 'UnaryExpression';
|
|
},
|
|
// as [-1]
|
|
elements: [val],
|
|
// as -1
|
|
operator: val.operator,
|
|
prefix: val.prefix,
|
|
argument: val.argument,
|
|
};
|
|
}
|
|
}
|