mirror of https://github.com/sveltejs/svelte
Rich Harris
8 years ago
parent
0ed093d93c
commit
722e3864f6
@ -1,348 +0,0 @@
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import deindent from '../../../../utils/deindent';
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import flattenReference from '../../../../utils/flattenReference';
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import getStaticAttributeValue from '../../../../utils/getStaticAttributeValue';
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import { DomGenerator } from '../../index';
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import Block from '../../Block';
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import { Node } from '../../../../interfaces';
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import { State } from '../../interfaces';
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import getObject from '../../../../utils/getObject';
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import getTailSnippet from '../../../../utils/getTailSnippet';
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const readOnlyMediaAttributes = new Set([
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'duration',
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'buffered',
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'seekable',
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'played'
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]);
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export default function visitBinding(
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generator: DomGenerator,
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block: Block,
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state: State,
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node: Node,
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attribute: Node
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) {
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const { name } = getObject(attribute.value);
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const { snippet, contexts, dependencies } = block.contextualise(
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attribute.value
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);
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contexts.forEach(context => {
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if (!~state.allUsedContexts.indexOf(context))
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state.allUsedContexts.push(context);
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});
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const eventNames = getBindingEventName(node, attribute);
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const handler = block.getUniqueName(
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`${state.parentNode}_${eventNames.join('_')}_handler`
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);
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const isMultipleSelect =
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node.name === 'select' &&
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node.attributes.find(
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(attr: Node) => attr.name.toLowerCase() === 'multiple'
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); // TODO use getStaticAttributeValue
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const type = getStaticAttributeValue(node, 'type');
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const bindingGroup = attribute.name === 'group'
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? getBindingGroup(generator, attribute.value)
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: null;
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const isMediaElement = node.name === 'audio' || node.name === 'video';
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const isReadOnly = isMediaElement && readOnlyMediaAttributes.has(attribute.name)
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const value = getBindingValue(
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generator,
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block,
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state,
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node,
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attribute,
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isMultipleSelect,
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isMediaElement,
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bindingGroup,
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type
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);
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let setter = getSetter(generator, block, name, snippet, state.parentNode, attribute, dependencies, value);
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let updateElement = `${state.parentNode}.${attribute.name} = ${snippet};`;
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const needsLock = !isReadOnly && node.name !== 'input' || !/radio|checkbox|range|color/.test(type); // TODO others?
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const lock = `#${state.parentNode}_updating`;
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let updateConditions = needsLock ? [`!${lock}`] : [];
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if (needsLock) block.addVariable(lock, 'false');
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// <select> special case
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if (node.name === 'select') {
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if (!isMultipleSelect) {
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setter = `var selectedOption = ${state.parentNode}.querySelector(':checked') || ${state.parentNode}.options[0];\n${setter}`;
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}
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const value = block.getUniqueName('value');
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const option = block.getUniqueName('option');
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const ifStatement = isMultipleSelect
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? deindent`
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${option}.selected = ~${value}.indexOf(${option}.__value);`
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: deindent`
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if (${option}.__value === ${value}) {
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${option}.selected = true;
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break;
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}`;
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const { name } = getObject(attribute.value);
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const tailSnippet = getTailSnippet(attribute.value);
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updateElement = deindent`
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var ${value} = ${snippet};
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for (var #i = 0; #i < ${state.parentNode}.options.length; #i += 1) {
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var ${option} = ${state.parentNode}.options[#i];
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${ifStatement}
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}
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`;
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generator.hasComplexBindings = true;
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block.builders.hydrate.addBlock(
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`if (!('${name}' in state)) #component._root._beforecreate.push(${handler});`
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);
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} else if (attribute.name === 'group') {
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// <input type='checkbox|radio' bind:group='selected'> special case
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if (type === 'radio') {
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setter = deindent`
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if (!${state.parentNode}.checked) return;
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${setter}
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`;
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}
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const condition = type === 'checkbox'
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? `~${snippet}.indexOf(${state.parentNode}.__value)`
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: `${state.parentNode}.__value === ${snippet}`;
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block.builders.hydrate.addLine(
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`#component._bindingGroups[${bindingGroup}].push(${state.parentNode});`
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);
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block.builders.destroy.addBlock(
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`#component._bindingGroups[${bindingGroup}].splice(#component._bindingGroups[${bindingGroup}].indexOf(${state.parentNode}), 1);`
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);
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updateElement = `${state.parentNode}.checked = ${condition};`;
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} else if (isMediaElement) {
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generator.hasComplexBindings = true;
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block.builders.hydrate.addBlock(`#component._root._beforecreate.push(${handler});`);
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if (attribute.name === 'currentTime') {
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const frame = block.getUniqueName(`${state.parentNode}_animationframe`);
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block.addVariable(frame);
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setter = deindent`
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cancelAnimationFrame(${frame});
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if (!${state.parentNode}.paused) ${frame} = requestAnimationFrame(${handler});
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${setter}
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`;
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updateConditions.push(`!isNaN(${snippet})`);
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} else if (attribute.name === 'paused') {
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// this is necessary to prevent the audio restarting by itself
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const last = block.getUniqueName(`${state.parentNode}_paused_value`);
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block.addVariable(last, 'true');
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updateConditions = [`${last} !== (${last} = ${snippet})`];
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updateElement = `${state.parentNode}[${last} ? "pause" : "play"]();`;
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}
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}
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block.builders.init.addBlock(deindent`
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function ${handler}() {
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${needsLock && `${lock} = true;`}
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${setter}
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${needsLock && `${lock} = false;`}
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}
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`);
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if (node.name === 'input' && type === 'range') {
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// need to bind to `input` and `change`, for the benefit of IE
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block.builders.hydrate.addBlock(deindent`
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@addListener(${state.parentNode}, "input", ${handler});
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@addListener(${state.parentNode}, "change", ${handler});
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`);
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block.builders.destroy.addBlock(deindent`
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@removeListener(${state.parentNode}, "input", ${handler});
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@removeListener(${state.parentNode}, "change", ${handler});
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`);
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} else {
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eventNames.forEach(eventName => {
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block.builders.hydrate.addLine(
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`@addListener(${state.parentNode}, "${eventName}", ${handler});`
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);
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block.builders.destroy.addLine(
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`@removeListener(${state.parentNode}, "${eventName}", ${handler});`
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);
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});
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}
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if (!isMediaElement) {
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node.initialUpdate = updateElement;
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}
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if (!isReadOnly) { // audio/video duration is read-only, it never updates
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if (updateConditions.length) {
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block.builders.update.addBlock(deindent`
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if (${updateConditions.join(' && ')}) {
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${updateElement}
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}
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`);
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} else {
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block.builders.update.addBlock(deindent`
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${updateElement}
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`);
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}
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}
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if (attribute.name === 'paused') {
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block.builders.create.addLine(
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`@addListener(${state.parentNode}, "play", ${handler});`
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);
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block.builders.destroy.addLine(
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`@removeListener(${state.parentNode}, "play", ${handler});`
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);
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}
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}
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function getBindingEventName(node: Node, attribute: Node) {
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if (node.name === 'input') {
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const typeAttribute = node.attributes.find(
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(attr: Node) => attr.type === 'Attribute' && attr.name === 'type'
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);
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const type = typeAttribute ? typeAttribute.value[0].data : 'text'; // TODO in validation, should throw if type attribute is not static
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return [type === 'checkbox' || type === 'radio' ? 'change' : 'input'];
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}
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if (node.name === 'textarea') return ['input'];
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if (attribute.name === 'currentTime') return ['timeupdate'];
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if (attribute.name === 'duration') return ['durationchange'];
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if (attribute.name === 'paused') return ['pause'];
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if (attribute.name === 'buffered') return ['progress', 'loadedmetadata'];
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if (attribute.name === 'seekable') return ['loadedmetadata'];
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if (attribute.name === 'played') return ['timeupdate'];
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return ['change'];
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}
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function getBindingValue(
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generator: DomGenerator,
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block: Block,
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state: State,
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node: Node,
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attribute: Node,
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isMultipleSelect: boolean,
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isMediaElement: boolean,
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bindingGroup: number,
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type: string
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) {
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// <select multiple bind:value='selected>
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if (isMultipleSelect) {
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return `[].map.call(${state.parentNode}.querySelectorAll(':checked'), function(option) { return option.__value; })`;
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}
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// <select bind:value='selected>
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if (node.name === 'select') {
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return 'selectedOption && selectedOption.__value';
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}
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// <input type='checkbox' bind:group='foo'>
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if (attribute.name === 'group') {
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if (type === 'checkbox') {
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return `@getBindingGroupValue(#component._bindingGroups[${bindingGroup}])`;
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}
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return `${state.parentNode}.__value`;
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}
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// <input type='range|number' bind:value>
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if (type === 'range' || type === 'number') {
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return `@toNumber(${state.parentNode}.${attribute.name})`;
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}
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if (isMediaElement && (attribute.name === 'buffered' || attribute.name === 'seekable' || attribute.name === 'played')) {
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return `@timeRangesToArray(${state.parentNode}.${attribute.name})`
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}
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// everything else
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return `${state.parentNode}.${attribute.name}`;
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}
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function getBindingGroup(generator: DomGenerator, value: Node) {
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const { parts } = flattenReference(value); // TODO handle cases involving computed member expressions
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const keypath = parts.join('.');
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// TODO handle contextual bindings — `keypath` should include unique ID of
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// each block that provides context
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let index = generator.bindingGroups.indexOf(keypath);
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if (index === -1) {
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index = generator.bindingGroups.length;
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generator.bindingGroups.push(keypath);
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}
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return index;
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}
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function getSetter(
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generator: DomGenerator,
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block: Block,
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name: string,
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snippet: string,
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_this: string,
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attribute: Node,
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dependencies: string[],
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value: string,
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) {
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const tail = attribute.value.type === 'MemberExpression'
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? getTailSnippet(attribute.value)
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: '';
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if (block.contexts.has(name)) {
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const prop = dependencies[0];
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const computed = isComputed(attribute.value);
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return deindent`
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var list = ${_this}._svelte.${block.listNames.get(name)};
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var index = ${_this}._svelte.${block.indexNames.get(name)};
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${computed && `var state = #component.get();`}
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list[index]${tail} = ${value};
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${computed
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? `#component.set({${dependencies.map((prop: string) => `${prop}: state.${prop}`).join(', ')} });`
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: `#component.set({${dependencies.map((prop: string) => `${prop}: #component.get('${prop}')`).join(', ')} });`}
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`;
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}
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if (attribute.value.type === 'MemberExpression') {
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// This is a little confusing, and should probably be tidied up
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// at some point. It addresses a tricky bug (#893), wherein
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// Svelte tries to `set()` a computed property, which throws an
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// error in dev mode. a) it's possible that we should be
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// replacing computations with *their* dependencies, and b)
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// we should probably populate `generator.readonly` sooner so
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// that we don't have to do the `.some()` here
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dependencies = dependencies.filter(prop => !generator.computations.some(computation => computation.key === prop));
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return deindent`
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var state = #component.get();
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${snippet} = ${value};
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#component.set({ ${dependencies.map((prop: string) => `${prop}: state.${prop}`).join(', ')} });
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`;
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}
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return `#component.set({ ${name}: ${value} });`;
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}
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function isComputed(node: Node) {
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while (node.type === 'MemberExpression') {
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if (node.computed) return true;
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node = node.object;
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}
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return false;
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}
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