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index.js
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index.js
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import deindent from '../../../../../utils/deindent.js';
import isReference from '../../../../../utils/isReference.js';
import flattenReference from '../../../../../utils/flattenReference.js';
export default function createBinding ( generator, node, attribute, current, local ) {
const parts = attribute.value.split( '.' );
const deep = parts.length > 1;
const contextual = parts[0] in current.contexts;
if ( contextual && !~local.allUsedContexts.indexOf( parts[0] ) ) {
local.allUsedContexts.push( parts[0] );
}
if ( local.isComponent ) {
let obj;
let prop;
let value;
if ( contextual ) {
obj = current.listNames[ parts[0] ];
prop = current.indexNames[ parts[0] ];
value = attribute.value;
} else {
prop = `'${parts.slice( -1 )}'`;
obj = parts.length > 1 ? `root.${parts.slice( 0, -1 ).join( '.' )}` : `root`;
value = `root.${attribute.value}`;
}
local.bindings.push({ name: attribute.name, value, obj, prop });
}
const handler = current.getUniqueName( `${local.name}ChangeHandler` );
let setter;
let eventName = 'change';
if ( node.name === 'input' ) {
const typeAttribute = node.attributes.find( attr => attr.type === 'Attribute' && attr.name === 'type' );
const type = typeAttribute ? typeAttribute.value[0].data : 'text'; // TODO in validation, should throw if type attribute is not static
if ( type !== 'checkbox' && type !== 'radio' ) {
eventName = 'input';
}
}
else if ( node.name === 'textarea' ) {
eventName = 'input';
}
const isMultipleSelect = node.name === 'select' && node.attributes.find( attr => attr.name.toLowerCase() === 'multiple' ); // TODO ensure that this is a static attribute
let value;
if ( local.isComponent ) {
value = 'value';
} else if ( node.name === 'select' ) {
if ( isMultipleSelect ) {
value = `[].map.call( ${local.name}.selectedOptions, function ( option ) { return option.__value; })`;
} else {
value = 'selectedOption && selectedOption.__value';
}
} else {
value = `${local.name}.${attribute.name}`;
}
if ( contextual ) {
// find the top-level property that this is a child of
let fragment = current;
let prop = parts[0];
do {
if ( fragment.expression && fragment.context === prop ) {
if ( !isReference( fragment.expression ) ) {
// TODO this should happen in prior validation step
throw new Error( `${prop} is read-only, it cannot be bound` );
}
prop = flattenReference( fragment.expression ).name;
}
} while ( fragment = fragment.parent );
generator.expectedProperties[ prop ] = true;
const listName = current.listNames[ parts[0] ];
const indexName = current.indexNames[ parts[0] ];
const context = local.isComponent ? `_context` : `__svelte`;
setter = deindent`
var list = this.${context}.${listName};
var index = this.${context}.${indexName};
list[index]${parts.slice( 1 ).map( part => `.${part}` ).join( '' )} = ${value};
component._set({ ${prop}: component.get( '${prop}' ) });
`;
} else {
if ( deep ) {
setter = deindent`
var ${parts[0]} = component.get( '${parts[0]}' );
${parts[0]}.${parts.slice( 1 ).join( '.' )} = ${value};
component._set({ ${parts[0]}: ${parts[0]} });
`;
} else {
setter = `component._set({ ${attribute.value}: ${value} });`;
}
generator.expectedProperties[ parts[0] ] = true;
}
// special case
if ( node.name === 'select' && !isMultipleSelect ) {
setter = `var selectedOption = ${local.name}.selectedOptions[0] || ${local.name}.options[0];\n` + setter;
}
if ( local.isComponent ) {
generator.hasComplexBindings = true;
local.init.addBlock( deindent`
var ${local.name}_updating = false;
component._bindings.push( function () {
if ( ${local.name}._torndown ) return;
${local.name}.observe( '${attribute.name}', function ( value ) {
${local.name}_updating = true;
${setter}
${local.name}_updating = false;
});
});
` );
local.update.addBlock( deindent`
if ( !${local.name}_updating && '${parts[0]}' in changed ) {
${local.name}._set({ ${attribute.name}: ${contextual ? attribute.value : `root.${attribute.value}`} });
}
` );
} else {
let updateElement;
if ( node.name === 'select' ) {
const value = generator.current.getUniqueName( 'value' );
const i = generator.current.getUniqueName( 'i' );
const option = generator.current.getUniqueName( 'option' );
const ifStatement = isMultipleSelect ?
deindent`
${option}.selected = ~${value}.indexOf( ${option}.__value );` :
deindent`
if ( ${option}.__value === ${value} ) {
${option}.selected = true;
break;
}`;
updateElement = deindent`
var ${value} = ${contextual ? attribute.value : `root.${attribute.value}`};
console.log( 'value', ${value} );
for ( var ${i} = 0; ${i} < ${local.name}.options.length; ${i} += 1 ) {
var ${option} = ${local.name}.options[${i}];
${ifStatement}
}
`;
} else {
updateElement = `${local.name}.${attribute.name} = ${contextual ? attribute.value : `root.${attribute.value}`};`;
}
local.init.addBlock( deindent`
var ${local.name}_updating = false;
function ${handler} () {
${local.name}_updating = true;
${setter}
${local.name}_updating = false;
}
${generator.helper( 'addEventListener' )}( ${local.name}, '${eventName}', ${handler} );
` );
node.initialUpdate = updateElement;
local.update.addLine( deindent`
if ( !${local.name}_updating ) {
${updateElement}
}
` );
generator.current.builders.teardown.addLine( deindent`
${generator.helper( 'removeEventListener' )}( ${local.name}, '${eventName}', ${handler} );
` );
}
}