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import MagicString from 'magic-string';
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import { walk } from 'estree-walker';
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import deindent from './utils/deindent.js';
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import walkHtml from './utils/walkHtml.js';
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import isReference from './utils/isReference.js';
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import contextualise from './utils/contextualise.js';
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import counter from './utils/counter.js';
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import attributeLookup from './attributes/lookup.js';
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import createBinding from './binding/index.js';
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function createRenderer ( fragment ) {
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if ( fragment.autofocus ) {
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fragment.initStatements.push( `${fragment.autofocus}.focus();` );
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}
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return deindent`
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function ${fragment.name} ( component, target${fragment.useAnchor ? ', anchor' : ''} ) {
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${fragment.initStatements.join( '\n\n' )}
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return {
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update: function ( ${fragment.contextChain.join( ', ' )} ) {
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${fragment.updateStatements.join( '\n\n' )}
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},
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teardown: function () {
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${fragment.teardownStatements.join( '\n\n' )}
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}
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};
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}
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`;
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}
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export default function generate ( parsed, template, options = {} ) {
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const code = new MagicString( template );
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function addSourcemapLocations ( node ) {
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walk( node, {
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enter ( node ) {
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code.addSourcemapLocation( node.start );
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code.addSourcemapLocation( node.end );
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}
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});
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}
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const templateProperties = {};
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if ( parsed.js ) {
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addSourcemapLocations( parsed.js.content );
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const defaultExport = parsed.js.content.body.find( node => node.type === 'ExportDefaultDeclaration' );
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if ( defaultExport ) {
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code.overwrite( defaultExport.start, defaultExport.declaration.start, `const template = ` );
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defaultExport.declaration.properties.forEach( prop => {
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templateProperties[ prop.key.name ] = prop.value;
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});
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}
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}
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const helpers = {};
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if ( templateProperties.helpers ) {
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templateProperties.helpers.properties.forEach( prop => {
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helpers[ prop.key.name ] = prop.value;
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});
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}
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const renderers = [];
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const getName = counter();
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// TODO use getName instead of counters
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const counters = {
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if: 0,
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each: 0
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};
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// TODO (scoped) css
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let current = {
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useAnchor: false,
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name: 'renderMainFragment',
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namespace: null,
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target: 'target',
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initStatements: [],
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updateStatements: [],
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teardownStatements: [],
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contexts: {},
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indexes: {},
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contextChain: [ 'root' ],
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indexNames: {},
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listNames: {},
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counter: counter(),
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parent: null
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};
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let usesRefs = false;
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parsed.html.children.forEach( child => {
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walkHtml( child, {
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Comment: {
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// do nothing
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},
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Element: {
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enter ( node ) {
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const name = current.counter( node.name );
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let namespace = name === 'svg' ? 'http://www.w3.org/2000/svg' : current.namespace;
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const initStatements = [];
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const updateStatements = [];
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const teardownStatements = [];
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const allUsedContexts = new Set();
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node.attributes.forEach( attribute => {
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if ( attribute.type === 'Attribute' ) {
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let metadata = attributeLookup[ attribute.name ];
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if ( metadata && metadata.appliesTo && !~metadata.appliesTo.indexOf( node.name ) ) metadata = null;
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if ( attribute.value === true ) {
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// attributes without values, e.g. <textarea readonly>
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if ( metadata ) {
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initStatements.push( deindent`
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${name}.${metadata.propertyName} = true;
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` );
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} else {
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initStatements.push( deindent`
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${name}.setAttribute( '${attribute.name}', true );
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` );
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}
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// special case – autofocus. has to be handled in a bit of a weird way
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if ( attribute.name === 'autofocus' ) {
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current.autofocus = name;
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}
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}
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else if ( attribute.value.length === 1 ) {
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const value = attribute.value[0];
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let result = '';
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if ( value.type === 'Text' ) {
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// static attributes
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result = JSON.stringify( value.data );
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if ( metadata ) {
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initStatements.push( deindent`
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${name}.${metadata.propertyName} = ${result};
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` );
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} else {
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initStatements.push( deindent`
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${name}.setAttribute( '${attribute.name}', ${result} );
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` );
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}
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// special case
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// TODO this attribute must be static – enforce at compile time
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if ( attribute.name === 'xmlns' ) {
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namespace = value;
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}
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}
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else {
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// dynamic – but potentially non-string – attributes
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contextualise( code, value.expression, current.contexts, current.indexes, helpers );
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result = `[✂${value.expression.start}-${value.expression.end}✂]`;
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if ( metadata ) {
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updateStatements.push( deindent`
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${name}.${metadata.propertyName} = ${result};
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` );
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} else {
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updateStatements.push( deindent`
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${name}.setAttribute( '${attribute.name}', ${result} );
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` );
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}
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}
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}
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else {
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const value = ( attribute.value[0].type === 'Text' ? '' : `"" + ` ) + (
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attribute.value.map( chunk => {
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if ( chunk.type === 'Text' ) {
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return JSON.stringify( chunk.data );
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} else {
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addSourcemapLocations( chunk.expression );
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contextualise( code, chunk.expression, current.contexts, current.indexes, helpers );
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return `( [✂${chunk.expression.start}-${chunk.expression.end}✂] )`;
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}
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}).join( ' + ' )
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);
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if ( metadata ) {
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updateStatements.push( deindent`
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${name}.${metadata.propertyName} = ${value};
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` );
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} else {
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updateStatements.push( deindent`
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${name}.setAttribute( '${attribute.name}', ${value} );
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` );
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}
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}
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}
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else if ( attribute.type === 'EventHandler' ) {
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// TODO verify that it's a valid callee (i.e. built-in or declared method)
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addSourcemapLocations( attribute.expression );
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code.insertRight( attribute.expression.start, 'component.' );
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const usedContexts = new Set();
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attribute.expression.arguments.forEach( arg => {
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const contexts = contextualise( code, arg, current.contexts, current.indexes, helpers, true );
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contexts.forEach( context => {
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usedContexts.add( context );
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allUsedContexts.add( context );
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});
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});
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// TODO hoist event handlers? can do `this.__component.method(...)`
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const declarations = [...usedContexts].map( name => {
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if ( name === 'root' ) return 'var root = this.__svelte.root;';
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const listName = current.listNames[ name ];
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const indexName = current.indexNames[ name ];
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return `var ${listName} = this.__svelte.${listName}, ${indexName} = this.__svelte.${indexName}, ${name} = ${listName}[${indexName}]`;
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});
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const handlerName = current.counter( `${attribute.name}Handler` );
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const handlerBody = ( declarations.length ? declarations.join( '\n' ) + '\n\n' : '' ) + `[✂${attribute.expression.start}-${attribute.expression.end}✂];`;
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const customEvent = templateProperties.events && templateProperties.events.properties.find( prop => prop.key.name === attribute.name );
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if ( customEvent ) {
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initStatements.push( deindent`
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const ${handlerName} = template.events.${attribute.name}( ${name}, function ( event ) {
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${handlerBody}
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});
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` );
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teardownStatements.push( deindent`
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${handlerName}.teardown();
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` );
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} else {
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initStatements.push( deindent`
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function ${handlerName} ( event ) {
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${handlerBody}
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}
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${name}.addEventListener( '${attribute.name}', ${handlerName}, false );
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` );
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teardownStatements.push( deindent`
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${name}.removeEventListener( '${attribute.name}', ${handlerName}, false );
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` );
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}
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}
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else if ( attribute.type === 'Binding' ) {
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createBinding( node, name, attribute, current, initStatements, updateStatements, teardownStatements, allUsedContexts );
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}
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else if ( attribute.type === 'Ref' ) {
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usesRefs = true;
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initStatements.push( deindent`
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component.refs.${attribute.name} = ${name};
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` );
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teardownStatements.push( deindent`
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component.refs.${attribute.name} = null;
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` );
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}
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else {
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throw new Error( `Not implemented: ${attribute.type}` );
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}
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});
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if ( allUsedContexts.size ) {
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initStatements.push( deindent`
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${name}.__svelte = {};
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` );
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const declarations = [...allUsedContexts].map( contextName => {
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if ( contextName === 'root' ) return `${name}.__svelte.root = root;`;
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const listName = current.listNames[ contextName ];
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const indexName = current.indexNames[ contextName ];
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return `${name}.__svelte.${listName} = ${listName};\n${name}.__svelte.${indexName} = ${indexName};`;
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}).join( '\n' );
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updateStatements.push( declarations );
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}
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initStatements.unshift(
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namespace ?
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`var ${name} = document.createElementNS( '${namespace}', '${node.name}' );` :
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`var ${name} = document.createElement( '${node.name}' );`
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);
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teardownStatements.push( `${name}.parentNode.removeChild( ${name} );` );
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current.initStatements.push( initStatements.join( '\n' ) );
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if ( updateStatements.length ) current.updateStatements.push( updateStatements.join( '\n' ) );
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current.teardownStatements.push( teardownStatements.join( '\n' ) );
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current = Object.assign( {}, current, {
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namespace,
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target: name,
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parent: current
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});
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},
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leave () {
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const name = current.target;
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current = current.parent;
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if ( current.useAnchor && current.target === 'target' ) {
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current.initStatements.push( deindent`
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anchor.parentNode.insertBefore( ${name}, anchor );
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` );
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} else {
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current.initStatements.push( deindent`
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${current.target}.appendChild( ${name} );
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` );
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}
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}
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},
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Text: {
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enter ( node ) {
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current.initStatements.push( deindent`
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${current.target}.appendChild( document.createTextNode( ${JSON.stringify( node.data )} ) );
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` );
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}
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},
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MustacheTag: {
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enter ( node ) {
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const name = current.counter( 'text' );
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current.initStatements.push( deindent`
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var ${name} = document.createTextNode( '' );
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var ${name}_value = '';
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${current.target}.appendChild( ${name} );
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` );
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addSourcemapLocations( node.expression );
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const usedContexts = contextualise( code, node.expression, current.contexts, current.indexes, helpers );
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const snippet = `[✂${node.expression.start}-${node.expression.end}✂]`;
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if ( isReference( node.expression ) ) {
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const reference = `${template.slice( node.expression.start, node.expression.end )}`;
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const qualified = usedContexts[0] === 'root' ? `root.${reference}` : reference;
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current.updateStatements.push( deindent`
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if ( ${snippet} !== ${name}_value ) {
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${name}_value = ${qualified};
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${name}.data = ${name}_value;
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}
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` );
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} else {
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const temp = getName( 'temp' );
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current.updateStatements.push( deindent`
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var ${temp} = ${snippet};
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if ( ${temp} !== ${name}_value ) {
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${name}_value = ${temp};
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${name}.data = ${name}_value;
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}
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` );
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}
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}
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},
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IfBlock: {
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enter ( node ) {
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const i = counters.if++;
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const name = `ifBlock_${i}`;
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const renderer = `renderIfBlock_${i}`;
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current.initStatements.push( deindent`
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var ${name}_anchor = document.createComment( ${JSON.stringify( `#if ${template.slice( node.expression.start, node.expression.end )}` )} );
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${current.target}.appendChild( ${name}_anchor );
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|
var ${name} = null;
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` );
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|
|
addSourcemapLocations( node.expression );
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|
|
|
const usedContexts = contextualise( code, node.expression, current.contexts, current.indexes, helpers );
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|
|
const snippet = `[✂${node.expression.start}-${node.expression.end}✂]`;
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|
|
|
|
let expression;
|
|
|
|
|
|
if ( isReference( node.expression ) ) {
|
|
|
const reference = `${template.slice( node.expression.start, node.expression.end )}`;
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|
|
expression = usedContexts[0] === 'root' ? `root.${reference}` : reference;
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|
|
|
current.updateStatements.push( deindent`
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|
|
if ( ${snippet} && !${name} ) {
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|
${name} = ${renderer}( component, ${current.target}, ${name}_anchor );
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|
}
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|
` );
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|
|
} else {
|
|
|
expression = `${name}_value`;
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|
|
|
|
current.updateStatements.push( deindent`
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|
|
var ${expression} = ${snippet};
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|
|
|
|
if ( ${expression} && !${name} ) {
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|
${name} = ${renderer}( component, ${current.target}, ${name}_anchor );
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|
|
}
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|
` );
|
|
|
}
|
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|
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|
|
current.updateStatements.push( deindent`
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|
|
else if ( !${expression} && ${name} ) {
|
|
|
${name}.teardown();
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|
|
${name} = null;
|
|
|
}
|
|
|
|
|
|
if ( ${name} ) {
|
|
|
${name}.update( ${current.contextChain.join( ', ' )} );
|
|
|
}
|
|
|
` );
|
|
|
|
|
|
current.teardownStatements.push( deindent`
|
|
|
if ( ${name} ) ${name}.teardown();
|
|
|
${name}_anchor.parentNode.removeChild( ${name}_anchor );
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|
|
` );
|
|
|
|
|
|
current = Object.assign( {}, current, {
|
|
|
useAnchor: true,
|
|
|
name: renderer,
|
|
|
target: 'target',
|
|
|
|
|
|
initStatements: [],
|
|
|
updateStatements: [],
|
|
|
teardownStatements: [],
|
|
|
|
|
|
counter: counter(),
|
|
|
|
|
|
parent: current
|
|
|
});
|
|
|
},
|
|
|
|
|
|
leave () {
|
|
|
renderers.push( createRenderer( current ) );
|
|
|
current = current.parent;
|
|
|
}
|
|
|
},
|
|
|
|
|
|
EachBlock: {
|
|
|
enter ( node ) {
|
|
|
const i = counters.each++;
|
|
|
const name = `eachBlock_${i}`;
|
|
|
const renderer = `renderEachBlock_${i}`;
|
|
|
|
|
|
const listName = `${name}_value`;
|
|
|
|
|
|
current.initStatements.push( deindent`
|
|
|
var ${name}_anchor = document.createComment( ${JSON.stringify( `#each ${template.slice( node.expression.start, node.expression.end )}` )} );
|
|
|
${current.target}.appendChild( ${name}_anchor );
|
|
|
var ${name}_iterations = [];
|
|
|
const ${name}_fragment = document.createDocumentFragment();
|
|
|
` );
|
|
|
|
|
|
addSourcemapLocations( node.expression );
|
|
|
|
|
|
contextualise( code, node.expression, current.contexts, current.indexes, helpers );
|
|
|
const snippet = `[✂${node.expression.start}-${node.expression.end}✂]`;
|
|
|
|
|
|
current.updateStatements.push( deindent`
|
|
|
var ${name}_value = ${snippet};
|
|
|
|
|
|
for ( var i = 0; i < ${name}_value.length; i += 1 ) {
|
|
|
if ( !${name}_iterations[i] ) {
|
|
|
${name}_iterations[i] = ${renderer}( component, ${name}_fragment );
|
|
|
}
|
|
|
|
|
|
const iteration = ${name}_iterations[i];
|
|
|
${name}_iterations[i].update( ${current.contextChain.join( ', ' )}, ${listName}, ${listName}[i], i );
|
|
|
}
|
|
|
|
|
|
for ( var i = ${name}_value.length; i < ${name}_iterations.length; i += 1 ) {
|
|
|
${name}_iterations[i].teardown();
|
|
|
}
|
|
|
|
|
|
${name}_anchor.parentNode.insertBefore( ${name}_fragment, ${name}_anchor );
|
|
|
${name}_iterations.length = ${listName}.length;
|
|
|
` );
|
|
|
|
|
|
current.teardownStatements.push( deindent`
|
|
|
for ( let i = 0; i < ${name}_iterations.length; i += 1 ) {
|
|
|
${name}_iterations[i].teardown();
|
|
|
}
|
|
|
|
|
|
${name}_anchor.parentNode.removeChild( ${name}_anchor );
|
|
|
` );
|
|
|
|
|
|
const indexNames = Object.assign( {}, current.indexNames );
|
|
|
const indexName = indexNames[ node.context ] = ( node.index || `${node.context}__index` );
|
|
|
|
|
|
const listNames = Object.assign( {}, current.listNames );
|
|
|
listNames[ node.context ] = listName;
|
|
|
|
|
|
const contexts = Object.assign( {}, current.contexts );
|
|
|
contexts[ node.context ] = true;
|
|
|
|
|
|
const indexes = Object.assign( {}, current.indexes );
|
|
|
if ( node.index ) indexes[ indexName ] = node.context;
|
|
|
|
|
|
const contextChain = current.contextChain.concat( listName, node.context, indexName );
|
|
|
|
|
|
current = {
|
|
|
useAnchor: false,
|
|
|
name: renderer,
|
|
|
target: 'target',
|
|
|
expression: node.expression,
|
|
|
context: node.context,
|
|
|
|
|
|
contexts,
|
|
|
indexes,
|
|
|
|
|
|
indexNames,
|
|
|
listNames,
|
|
|
contextChain,
|
|
|
|
|
|
initStatements: [],
|
|
|
updateStatements: [ Object.keys( contexts ).map( contextName => {
|
|
|
const listName = listNames[ contextName ];
|
|
|
const indexName = indexNames[ contextName ];
|
|
|
|
|
|
return `var ${contextName} = ${listName}[${indexName}];`;
|
|
|
}).join( '\n' ) ],
|
|
|
teardownStatements: [],
|
|
|
|
|
|
counter: counter(),
|
|
|
|
|
|
parent: current
|
|
|
};
|
|
|
},
|
|
|
|
|
|
leave () {
|
|
|
renderers.push( createRenderer( current ) );
|
|
|
|
|
|
current = current.parent;
|
|
|
}
|
|
|
}
|
|
|
});
|
|
|
});
|
|
|
|
|
|
renderers.push( createRenderer( current ) );
|
|
|
|
|
|
const setStatements = [ deindent`
|
|
|
const oldState = state;
|
|
|
state = Object.assign( {}, oldState, newState );
|
|
|
` ];
|
|
|
|
|
|
if ( templateProperties.computed ) {
|
|
|
const dependencies = new Map();
|
|
|
|
|
|
templateProperties.computed.properties.forEach( prop => {
|
|
|
const key = prop.key.name;
|
|
|
const value = prop.value;
|
|
|
|
|
|
const deps = value.params.map( param => param.name );
|
|
|
dependencies.set( key, deps );
|
|
|
});
|
|
|
|
|
|
const visited = new Set();
|
|
|
|
|
|
function visit ( key ) {
|
|
|
if ( !dependencies.has( key ) ) return; // not a computation
|
|
|
|
|
|
if ( visited.has( key ) ) return;
|
|
|
visited.add( key );
|
|
|
|
|
|
const deps = dependencies.get( key );
|
|
|
deps.forEach( visit );
|
|
|
|
|
|
setStatements.push( deindent`
|
|
|
if ( ${deps.map( dep => `( '${dep}' in newState && typeof state.${dep} === 'object' || state.${dep} !== oldState.${dep} )` ).join( ' || ' )} ) {
|
|
|
state.${key} = newState.${key} = template.computed.${key}( ${deps.map( dep => `state.${dep}` ).join( ', ' )} );
|
|
|
}
|
|
|
` );
|
|
|
}
|
|
|
|
|
|
templateProperties.computed.properties.forEach( prop => visit( prop.key.name ) );
|
|
|
}
|
|
|
|
|
|
setStatements.push( deindent`
|
|
|
dispatchObservers( observers.immediate, newState, oldState );
|
|
|
mainFragment.update( state );
|
|
|
dispatchObservers( observers.deferred, newState, oldState );
|
|
|
` );
|
|
|
|
|
|
const constructorName = options.name || 'SvelteComponent';
|
|
|
|
|
|
const result = deindent`
|
|
|
${parsed.js ? `[✂${parsed.js.content.start}-${parsed.js.content.end}✂]` : ``}
|
|
|
|
|
|
${renderers.reverse().join( '\n\n' )}
|
|
|
|
|
|
export default function ${constructorName} ( options ) {
|
|
|
var component = this;${usesRefs ? `\nthis.refs = {}` : ``}
|
|
|
var state = {};
|
|
|
|
|
|
var observers = {
|
|
|
immediate: Object.create( null ),
|
|
|
deferred: Object.create( null )
|
|
|
};
|
|
|
|
|
|
function dispatchObservers ( group, newState, oldState ) {
|
|
|
for ( const key in group ) {
|
|
|
if ( !( key in newState ) ) continue;
|
|
|
|
|
|
const newValue = newState[ key ];
|
|
|
const oldValue = oldState[ key ];
|
|
|
|
|
|
if ( newValue === oldValue && typeof newValue !== 'object' ) continue;
|
|
|
|
|
|
const callbacks = group[ key ];
|
|
|
if ( !callbacks ) continue;
|
|
|
|
|
|
for ( let i = 0; i < callbacks.length; i += 1 ) {
|
|
|
callbacks[i].call( component, newValue, oldValue );
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
this.get = function get ( key ) {
|
|
|
return state[ key ];
|
|
|
};
|
|
|
|
|
|
this.set = function set ( newState ) {
|
|
|
${setStatements.join( '\n\n' )}
|
|
|
};
|
|
|
|
|
|
this.observe = function ( key, callback, options = {} ) {
|
|
|
const group = options.defer ? observers.deferred : observers.immediate;
|
|
|
|
|
|
( group[ key ] || ( group[ key ] = [] ) ).push( callback );
|
|
|
if ( options.init !== false ) callback( state[ key ] );
|
|
|
|
|
|
return {
|
|
|
cancel () {
|
|
|
const index = group[ key ].indexOf( callback );
|
|
|
if ( ~index ) group[ key ].splice( index, 1 );
|
|
|
}
|
|
|
};
|
|
|
};
|
|
|
|
|
|
this.teardown = function teardown () {
|
|
|
mainFragment.teardown();
|
|
|
mainFragment = null;
|
|
|
|
|
|
state = {};
|
|
|
|
|
|
${templateProperties.onteardown ? `template.onteardown.call( this );` : ``}
|
|
|
};
|
|
|
|
|
|
let mainFragment = renderMainFragment( this, options.target );
|
|
|
this.set( ${templateProperties.data ? `Object.assign( template.data(), options.data )` : `options.data`} );
|
|
|
|
|
|
${templateProperties.onrender ? `template.onrender.call( this );` : ``}
|
|
|
}
|
|
|
|
|
|
${templateProperties.methods ? `${constructorName}.prototype = template.methods` : ''}
|
|
|
`;
|
|
|
|
|
|
const pattern = /\[✂(\d+)-(\d+)$/;
|
|
|
|
|
|
const parts = result.split( '✂]' );
|
|
|
const finalChunk = parts.pop();
|
|
|
|
|
|
const sortedByResult = parts.map( ( str, index ) => {
|
|
|
const match = pattern.exec( str );
|
|
|
|
|
|
return {
|
|
|
index,
|
|
|
chunk: str.replace( pattern, '' ),
|
|
|
start: +match[1],
|
|
|
end: +match[2]
|
|
|
};
|
|
|
});
|
|
|
|
|
|
const sortedBySource = sortedByResult
|
|
|
.slice()
|
|
|
.sort( ( a, b ) => a.start - b.start );
|
|
|
|
|
|
let c = 0;
|
|
|
|
|
|
sortedBySource.forEach( part => {
|
|
|
code.remove( c, part.start );
|
|
|
code.insertRight( part.start, part.chunk );
|
|
|
c = part.end;
|
|
|
});
|
|
|
|
|
|
code.remove( c, template.length );
|
|
|
code.append( finalChunk );
|
|
|
|
|
|
sortedByResult.forEach( part => {
|
|
|
code.move( part.start, part.end, 0 );
|
|
|
});
|
|
|
|
|
|
return {
|
|
|
code: code.toString(),
|
|
|
map: code.generateMap()
|
|
|
};
|
|
|
}
|
