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80 lines
2.5 KiB
80 lines
2.5 KiB
import deindent from '../../../utils/deindent.js';
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import isReference from '../../../utils/isReference.js';
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import flattenReference from '../../../utils/flattenReference.js';
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export default function createBinding ( node, name, attribute, current, initStatements, updateStatements, teardownStatements, allUsedContexts ) {
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const parts = attribute.value.split( '.' );
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const deep = parts.length > 1;
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const contextual = parts[0] in current.contexts;
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if ( contextual ) allUsedContexts.add( parts[0] );
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const handler = current.counter( `${name}ChangeHandler` );
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let setter;
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let eventName = 'change';
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if ( node.name === 'input' ) {
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const type = node.attributes.find( attr => attr.type === 'Attribute' && attr.name === 'type' );
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if ( !type || type.value[0].data === 'text' ) {
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// TODO in validation, should throw if type attribute is not static
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eventName = 'input';
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}
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}
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if ( contextual ) {
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// find the top-level property that this is a child of
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let fragment = current;
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let prop = parts[0];
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do {
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if ( fragment.expression && fragment.context === prop ) {
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if ( !isReference( fragment.expression ) ) {
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// TODO this should happen in prior validation step
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throw new Error( `${prop} is read-only, it cannot be bound` );
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}
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prop = flattenReference( fragment.expression ).name;
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}
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} while ( fragment = fragment.parent );
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const listName = current.listNames[ parts[0] ];
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const indexName = current.indexNames[ parts[0] ];
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setter = deindent`
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var list = this.__svelte.${listName};
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var index = this.__svelte.${indexName};
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list[index]${parts.slice( 1 ).map( part => `.${part}` ).join( '' )} = this.${attribute.name};
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component.set({ ${prop}: component.get( '${prop}' ) });
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`;
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} else if ( deep ) {
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setter = deindent`
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var ${parts[0]} = component.get( '${parts[0]}' );
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${parts[0]}.${parts.slice( 1 ).join( '.' )} = this.${attribute.name};
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component.set({ ${parts[0]}: ${parts[0]} });
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`;
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} else {
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setter = `component.set({ ${attribute.value}: ${name}.${attribute.name} });`;
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}
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initStatements.push( deindent`
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var ${name}_updating = false;
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function ${handler} () {
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${name}_updating = true;
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${setter}
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${name}_updating = false;
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}
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${name}.addEventListener( '${eventName}', ${handler}, false );
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` );
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updateStatements.push( deindent`
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if ( !${name}_updating ) ${name}.${attribute.name} = ${contextual ? attribute.value : `root.${attribute.value}`}
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` );
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teardownStatements.push( deindent`
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${name}.removeEventListener( '${eventName}', ${handler}, false );
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` );
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}
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