mirror of https://github.com/sveltejs/svelte
141 lines
3.9 KiB
141 lines
3.9 KiB
import deindent from '../utils/deindent.js';
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import addComponentAttributes from './attributes/addComponentAttributes.js';
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import counter from '../utils/counter.js';
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export default {
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enter ( generator, node ) {
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const hasChildren = node.children.length > 0;
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const name = generator.current.counter( `${node.name[0].toLowerCase()}${node.name.slice( 1 )}` );
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const local = {
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name,
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namespace: generator.current.namespace,
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isComponent: true,
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allUsedContexts: new Set(),
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init: [],
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mount: [],
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update: [],
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teardown: []
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};
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const isToplevel = generator.current.localElementDepth === 0;
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generator.hasComponents = true;
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addComponentAttributes( generator, node, local );
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const componentInitProperties = [
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`target: ${!isToplevel ? generator.current.target: 'null'}`,
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'root: component.root || component'
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];
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// Component has children
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if ( hasChildren ) {
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const yieldName = `render${name}YieldFragment`;
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// {{YIELD STUFF}}
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generator.push({
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useAnchor: true,
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name: generator.current.counter(yieldName),
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target: 'target',
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localElementDepth: 0,
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initStatements: [],
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mountStatements: [],
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updateStatements: [],
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teardownStatements: [],
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counter: counter()
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});
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node.children.forEach( generator.visit );
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generator.addRenderer( generator.current );
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generator.pop();
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// Don't render children twice
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node.children = [];
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generator.current.initStatements.push(`var ${name}_yieldFragment = ${yieldName}( root, component );`);
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generator.current.updateStatements.push(`${name}_yieldFragment.update ( changed, root );`);
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componentInitProperties.push(`yield: ${name}_yieldFragment`);
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}
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const statements = [];
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if ( local.staticAttributes.length || local.dynamicAttributes.length || local.bindings.length ) {
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const initialProps = local.staticAttributes
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.concat( local.dynamicAttributes )
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.map( attribute => `${attribute.name}: ${attribute.value}` );
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if ( initialProps.length ) {
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statements.push( deindent`
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var ${name}_initialData = {
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${initialProps.join( ',\n' )}
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};
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` );
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} else {
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statements.push( `var ${name}_initialData = {};` );
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}
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if ( local.bindings.length ) {
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const bindings = local.bindings.map( binding => {
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const parts = binding.value.split( '.' );
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const tail = parts.pop();
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return `if ( '${tail}' in ${parts.join( '.' )} ) ${name}_initialData.${binding.name} = ${binding.value};`;
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});
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statements.push( bindings.join( '\n' ) );
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}
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componentInitProperties.push(`data: ${name}_initialData`);
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}
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local.init.unshift( deindent`
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${statements.join( '\n\n' )}
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var ${name} = new template.components.${node.name}({
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${componentInitProperties.join(',\n')}
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});
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` );
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if ( isToplevel ) {
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local.mount.unshift( `${name}.mount( target, anchor );` );
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}
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if ( local.dynamicAttributes.length ) {
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const updates = local.dynamicAttributes.map( attribute => {
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return deindent`
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if ( ${attribute.dependencies.map( dependency => `'${dependency}' in changed` ).join( '||' )} ) ${name}_changes.${attribute.name} = ${attribute.value};
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`;
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});
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local.update.push( deindent`
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var ${name}_changes = {};
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${updates.join( '\n' )}
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if ( Object.keys( ${name}_changes ).length ) ${name}.set( ${name}_changes );
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` );
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}
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local.teardown.push( `${name}.teardown( ${isToplevel ? 'detach' : 'false'} );` );
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generator.current.initStatements.push( local.init.join( '\n' ) );
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if ( local.update.length ) generator.current.updateStatements.push( local.update.join( '\n' ) );
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if ( local.mount.length ) generator.current.mountStatements.push( local.mount.join( '\n' ) );
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generator.current.teardownStatements.push( local.teardown.join( '\n' ) );
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generator.push({
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namespace: local.namespace,
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target: name,
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parent: generator.current,
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elementDepth: generator.current.elementDepth + 1,
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localElementDepth: generator.current.localElementDepth + 1
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});
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},
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leave ( generator ) {
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generator.pop();
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}
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};
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