msb-public
/
svelte
mirror of https://github.com/sveltejs/svelte
1
0
Code Issues Projects Releases Wiki Activity

modularize visitors

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pull/31/head
Rich-Harris 8 years ago
parent 191d776692
commit 5b397b781b
8 changed files with 530 additions and 494 deletions
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543
compiler/generate/index.js
Unescape View File

@ -1,38 +1,38 @@
import MagicString from 'magic-string';
import { walk } from 'estree-walker';
import deindent from './utils/deindent.js';
import walkHtml from './utils/walkHtml.js';
import isReference from './utils/isReference.js';
import counter from './utils/counter.js';
import attributeLookup from './attributes/lookup.js';
import createBinding from './binding/index.js';
import flattenReference from './utils/flattenReference.js';
import visitors from './visitors/index.js';
function createRenderer ( fragment ) {
if ( fragment.autofocus ) {
fragment.initStatements.push( `${fragment.autofocus}.focus();` );
}
export default function generate ( parsed, template, options = {} ) {
const renderers = [];
return deindent`
function ${fragment.name} ( component, target${fragment.useAnchor ? ', anchor' : ''} ) {
${fragment.initStatements.join( '\n\n' )}
const generator = {
code: new MagicString( template ),
return {
update: function ( ${fragment.contextChain.join( ', ' )} ) {
${fragment.updateStatements.join( '\n\n' )}
},
addRenderer ( fragment ) {
if ( fragment.autofocus ) {
fragment.initStatements.push( `${fragment.autofocus}.focus();` );
}
teardown: function () {
${fragment.teardownStatements.join( '\n\n' )}
}
};
}
`;
}
renderers.push( deindent`
function ${fragment.name} ( component, target${fragment.useAnchor ? ', anchor' : ''} ) {
${fragment.initStatements.join( '\n\n' )}
export default function generate ( parsed, template, options = {} ) {
const generator = {
code: new MagicString( template ),
return {
update: function ( ${fragment.contextChain.join( ', ' )} ) {
${fragment.updateStatements.join( '\n\n' )}
},
teardown: function () {
${fragment.teardownStatements.join( '\n\n' )}
}
};
}
` );
},
addSourcemapLocations ( node ) {
walk( node, {
@ -55,7 +55,7 @@ export default function generate ( parsed, template, options = {} ) {
const { name } = flattenReference( node );
if ( parent && parent.type === 'CallExpression' && node === parent.callee ) {
if ( helpers[ name ] ) generator.code.insertRight( node.start, `template.helpers.` );
if ( generator.helpers[ name ] ) generator.code.insertRight( node.start, `template.helpers.` );
return;
}
@ -81,7 +81,8 @@ export default function generate ( parsed, template, options = {} ) {
return usedContexts;
},
renderers: [],
helpers: {},
events: {},
getName: counter(),
@ -91,12 +92,12 @@ export default function generate ( parsed, template, options = {} ) {
each: 0
},
usesRefs: false
usesRefs: false,
template
};
const templateProperties = {};
const helpers = {};
const components = {};
if ( parsed.js ) {
generator.addSourcemapLocations( parsed.js.content );
@ -111,11 +112,13 @@ export default function generate ( parsed, template, options = {} ) {
});
}
if ( templateProperties.helpers ) {
templateProperties.helpers.properties.forEach( prop => {
helpers[ prop.key.name ] = prop.value;
});
}
[ 'helpers', 'events' ].forEach( key => {
if ( templateProperties[ key ] ) {
templateProperties[ key ].properties.forEach( prop => {
generator[ key ][ prop.key.name ] = prop.value;
});
}
});
}
generator.current = {
@ -140,470 +143,22 @@ export default function generate ( parsed, template, options = {} ) {
parent: null
};
parsed.html.children.forEach( child => {
walkHtml( child, {
Comment: {
// do nothing
},
Element: {
enter ( node ) {
const name = generator.current.counter( node.name );
let namespace = name === 'svg' ? 'http://www.w3.org/2000/svg' : generator.current.namespace;
const initStatements = [];
const updateStatements = [];
const teardownStatements = [];
const allUsedContexts = new Set();
node.attributes.forEach( attribute => {
if ( attribute.type === 'Attribute' ) {
let metadata = attributeLookup[ attribute.name ];
if ( metadata && metadata.appliesTo && !~metadata.appliesTo.indexOf( node.name ) ) metadata = null;
if ( attribute.value === true ) {
// attributes without values, e.g. <textarea readonly>
if ( metadata ) {
initStatements.push( deindent`
${name}.${metadata.propertyName} = true;
` );
} else {
initStatements.push( deindent`
${name}.setAttribute( '${attribute.name}', true );
` );
}
// special case – autofocus. has to be handled in a bit of a weird way
if ( attribute.name === 'autofocus' ) {
generator.current.autofocus = name;
}
}
else if ( attribute.value.length === 1 ) {
const value = attribute.value[0];
let result = '';
if ( value.type === 'Text' ) {
// static attributes
result = JSON.stringify( value.data );
if ( metadata ) {
initStatements.push( deindent`
${name}.${metadata.propertyName} = ${result};
` );
} else {
initStatements.push( deindent`
${name}.setAttribute( '${attribute.name}', ${result} );
` );
}
// special case
// TODO this attribute must be static – enforce at compile time
if ( attribute.name === 'xmlns' ) {
namespace = value;
}
}
else {
// dynamic – but potentially non-string – attributes
generator.contextualise( value.expression );
result = `[✂${value.expression.start}-${value.expression.end}✂]`;
if ( metadata ) {
updateStatements.push( deindent`
${name}.${metadata.propertyName} = ${result};
` );
} else {
updateStatements.push( deindent`
${name}.setAttribute( '${attribute.name}', ${result} );
` );
}
}
}
else {
const value = ( attribute.value[0].type === 'Text' ? '' : `"" + ` ) + (
attribute.value.map( chunk => {
if ( chunk.type === 'Text' ) {
return JSON.stringify( chunk.data );
} else {
generator.addSourcemapLocations( chunk.expression );
generator.contextualise( chunk.expression );
return `( [✂${chunk.expression.start}-${chunk.expression.end}✂] )`;
}
}).join( ' + ' )
);
if ( metadata ) {
updateStatements.push( deindent`
${name}.${metadata.propertyName} = ${value};
` );
} else {
updateStatements.push( deindent`
${name}.setAttribute( '${attribute.name}', ${value} );
` );
}
}
}
else if ( attribute.type === 'EventHandler' ) {
// TODO verify that it's a valid callee (i.e. built-in or declared method)
generator.addSourcemapLocations( attribute.expression );
generator.code.insertRight( attribute.expression.start, 'component.' );
const usedContexts = new Set();
attribute.expression.arguments.forEach( arg => {
const contexts = generator.contextualise( arg, true );
contexts.forEach( context => {
usedContexts.add( context );
allUsedContexts.add( context );
});
});
// TODO hoist event handlers? can do `this.__component.method(...)`
const declarations = [...usedContexts].map( name => {
if ( name === 'root' ) return 'var root = this.__svelte.root;';
const listName = generator.current.listNames[ name ];
const indexName = generator.current.indexNames[ name ];
return `var ${listName} = this.__svelte.${listName}, ${indexName} = this.__svelte.${indexName}, ${name} = ${listName}[${indexName}]`;
});
const handlerName = generator.current.counter( `${attribute.name}Handler` );
const handlerBody = ( declarations.length ? declarations.join( '\n' ) + '\n\n' : '' ) + `[✂${attribute.expression.start}-${attribute.expression.end}✂];`;
const customEvent = templateProperties.events && templateProperties.events.properties.find( prop => prop.key.name === attribute.name );
if ( customEvent ) {
initStatements.push( deindent`
const ${handlerName} = template.events.${attribute.name}( ${name}, function ( event ) {
${handlerBody}
});
` );
teardownStatements.push( deindent`
${handlerName}.teardown();
` );
} else {
initStatements.push( deindent`
function ${handlerName} ( event ) {
${handlerBody}
}
${name}.addEventListener( '${attribute.name}', ${handlerName}, false );
` );
teardownStatements.push( deindent`
${name}.removeEventListener( '${attribute.name}', ${handlerName}, false );
` );
}
}
else if ( attribute.type === 'Binding' ) {
createBinding( node, name, attribute, generator.current, initStatements, updateStatements, teardownStatements, allUsedContexts );
}
else if ( attribute.type === 'Ref' ) {
generator.usesRefs = true;
initStatements.push( deindent`
component.refs.${attribute.name} = ${name};
` );
teardownStatements.push( deindent`
component.refs.${attribute.name} = null;
` );
}
else {
throw new Error( `Not implemented: ${attribute.type}` );
}
});
if ( allUsedContexts.size ) {
initStatements.push( deindent`
${name}.__svelte = {};
` );
const declarations = [...allUsedContexts].map( contextName => {
if ( contextName === 'root' ) return `${name}.__svelte.root = root;`;
const listName = generator.current.listNames[ contextName ];
const indexName = generator.current.indexNames[ contextName ];
return `${name}.__svelte.${listName} = ${listName};\n${name}.__svelte.${indexName} = ${indexName};`;
}).join( '\n' );
updateStatements.push( declarations );
}
initStatements.unshift(
namespace ?
`var ${name} = document.createElementNS( '${namespace}', '${node.name}' );` :
`var ${name} = document.createElement( '${node.name}' );`
);
teardownStatements.push( `${name}.parentNode.removeChild( ${name} );` );
generator.current.initStatements.push( initStatements.join( '\n' ) );
if ( updateStatements.length ) generator.current.updateStatements.push( updateStatements.join( '\n' ) );
generator.current.teardownStatements.push( teardownStatements.join( '\n' ) );
generator.current = Object.assign( {}, generator.current, {
namespace,
target: name,
parent: generator.current
});
},
leave () {
const name = generator.current.target;
generator.current = generator.current.parent;
if ( generator.current.useAnchor && generator.current.target === 'target' ) {
generator.current.initStatements.push( deindent`
anchor.parentNode.insertBefore( ${name}, anchor );
` );
} else {
generator.current.initStatements.push( deindent`
${generator.current.target}.appendChild( ${name} );
` );
}
}
},
Text: {
enter ( node ) {
generator.current.initStatements.push( deindent`
${generator.current.target}.appendChild( document.createTextNode( ${JSON.stringify( node.data )} ) );
` );
}
},
MustacheTag: {
enter ( node ) {
const name = generator.current.counter( 'text' );
generator.current.initStatements.push( deindent`
var ${name} = document.createTextNode( '' );
var ${name}_value = '';
${generator.current.target}.appendChild( ${name} );
` );
generator.addSourcemapLocations( node.expression );
const usedContexts = generator.contextualise( node.expression );
const snippet = `[✂${node.expression.start}-${node.expression.end}✂]`;
if ( isReference( node.expression ) ) {
const reference = `${template.slice( node.expression.start, node.expression.end )}`;
const qualified = usedContexts[0] === 'root' ? `root.${reference}` : reference;
generator.current.updateStatements.push( deindent`
if ( ${snippet} !== ${name}_value ) {
${name}_value = ${qualified};
${name}.data = ${name}_value;
}
` );
} else {
const temp = generator.getName( 'temp' );
generator.current.updateStatements.push( deindent`
var ${temp} = ${snippet};
if ( ${temp} !== ${name}_value ) {
${name}_value = ${temp};
${name}.data = ${name}_value;
}
` );
}
}
},
IfBlock: {
enter ( node ) {
const i = generator.counters.if++;
const name = `ifBlock_${i}`;
const renderer = `renderIfBlock_${i}`;
generator.current.initStatements.push( deindent`
var ${name}_anchor = document.createComment( ${JSON.stringify( `#if ${template.slice( node.expression.start, node.expression.end )}` )} );
${generator.current.target}.appendChild( ${name}_anchor );
var ${name} = null;
` );
generator.addSourcemapLocations( node.expression );
const usedContexts = generator.contextualise( node.expression );
const snippet = `[✂${node.expression.start}-${node.expression.end}✂]`;
let expression;
if ( isReference( node.expression ) ) {
const reference = `${template.slice( node.expression.start, node.expression.end )}`;
expression = usedContexts[0] === 'root' ? `root.${reference}` : reference;
generator.current.updateStatements.push( deindent`
if ( ${snippet} && !${name} ) {
${name} = ${renderer}( component, ${generator.current.target}, ${name}_anchor );
}
` );
} else {
expression = `${name}_value`;
generator.current.updateStatements.push( deindent`
var ${expression} = ${snippet};
if ( ${expression} && !${name} ) {
${name} = ${renderer}( component, ${generator.current.target}, ${name}_anchor );
}
` );
}
generator.current.updateStatements.push( deindent`
else if ( !${expression} && ${name} ) {
${name}.teardown();
${name} = null;
}
if ( ${name} ) {
${name}.update( ${generator.current.contextChain.join( ', ' )} );
}
` );
generator.current.teardownStatements.push( deindent`
if ( ${name} ) ${name}.teardown();
${name}_anchor.parentNode.removeChild( ${name}_anchor );
` );
generator.current = Object.assign( {}, generator.current, {
useAnchor: true,
name: renderer,
target: 'target',
initStatements: [],
updateStatements: [],
teardownStatements: [],
counter: counter(),
parent: generator.current
});
},
leave () {
generator.renderers.push( createRenderer( generator.current ) );
generator.current = generator.current.parent;
}
},
EachBlock: {
enter ( node ) {
const i = generator.counters.each++;
const name = `eachBlock_${i}`;
const renderer = `renderEachBlock_${i}`;
const listName = `${name}_value`;
generator.current.initStatements.push( deindent`
var ${name}_anchor = document.createComment( ${JSON.stringify( `#each ${template.slice( node.expression.start, node.expression.end )}` )} );
${generator.current.target}.appendChild( ${name}_anchor );
var ${name}_iterations = [];
const ${name}_fragment = document.createDocumentFragment();
` );
generator.addSourcemapLocations( node.expression );
generator.contextualise( node.expression );
const snippet = `[✂${node.expression.start}-${node.expression.end}✂]`;
generator.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 );
}
parsed.html.children.forEach( function visit ( node ) {
const visitor = visitors[ node.type ];
if ( !visitor ) throw new Error( `Not implemented: ${node.type}` );
const iteration = ${name}_iterations[i];
${name}_iterations[i].update( ${generator.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;
` );
generator.current.teardownStatements.push( deindent`
for ( let i = 0; i < ${name}_iterations.length; i += 1 ) {
${name}_iterations[i].teardown();
}
${name}_anchor.parentNode.removeChild( ${name}_anchor );
` );
const indexNames = Object.assign( {}, generator.current.indexNames );
const indexName = indexNames[ node.context ] = ( node.index || `${node.context}__index` );
const listNames = Object.assign( {}, generator.current.listNames );
listNames[ node.context ] = listName;
const contexts = Object.assign( {}, generator.current.contexts );
contexts[ node.context ] = true;
const indexes = Object.assign( {}, generator.current.indexes );
if ( node.index ) indexes[ indexName ] = node.context;
const contextChain = generator.current.contextChain.concat( listName, node.context, indexName );
generator.current = {
useAnchor: false,
name: renderer,
target: 'target',
expression: node.expression,
context: node.context,
if ( visitor.enter ) visitor.enter( generator, node );
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: generator.current
};
},
leave () {
generator.renderers.push( createRenderer( generator.current ) );
if ( node.children ) {
node.children.forEach( child => {
visit( child );
});
}
generator.current = generator.current.parent;
}
}
});
if ( visitor.leave ) visitor.leave( generator, node );
});
generator.renderers.push( createRenderer( generator.current ) );
generator.addRenderer( generator.current );
const setStatements = [ deindent`
const oldState = state;
@ -653,7 +208,7 @@ export default function generate ( parsed, template, options = {} ) {
const result = deindent`
${parsed.js ? `[✂${parsed.js.content.start}-${parsed.js.content.end}✂]` : ``}
${generator.renderers.reverse().join( '\n\n' )}
${renderers.reverse().join( '\n\n' )}
export default function ${constructorName} ( options ) {
var component = this;${generator.usesRefs ? `\nthis.refs = {}` : ``}

3
compiler/generate/visitors/Comment.js
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@ -0,0 +1,3 @@
export default {
// do nothing
};

99
compiler/generate/visitors/EachBlock.js
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@ -0,0 +1,99 @@
import deindent from '../utils/deindent.js';
import counter from '../utils/counter.js';
export default {
enter ( generator, node ) {
const i = generator.counters.each++;
const name = `eachBlock_${i}`;
const renderer = `renderEachBlock_${i}`;
const listName = `${name}_value`;
generator.current.initStatements.push( deindent`
var ${name}_anchor = document.createComment( ${JSON.stringify( `#each ${generator.template.slice( node.expression.start, node.expression.end )}` )} );
${generator.current.target}.appendChild( ${name}_anchor );
var ${name}_iterations = [];
const ${name}_fragment = document.createDocumentFragment();
` );
generator.addSourcemapLocations( node.expression );
generator.contextualise( node.expression );
const snippet = `[✂${node.expression.start}-${node.expression.end}✂]`;
generator.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( ${generator.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;
` );
generator.current.teardownStatements.push( deindent`
for ( let i = 0; i < ${name}_iterations.length; i += 1 ) {
${name}_iterations[i].teardown();
}
${name}_anchor.parentNode.removeChild( ${name}_anchor );
` );
const indexNames = Object.assign( {}, generator.current.indexNames );
const indexName = indexNames[ node.context ] = ( node.index || `${node.context}__index` );
const listNames = Object.assign( {}, generator.current.listNames );
listNames[ node.context ] = listName;
const contexts = Object.assign( {}, generator.current.contexts );
contexts[ node.context ] = true;
const indexes = Object.assign( {}, generator.current.indexes );
if ( node.index ) indexes[ indexName ] = node.context;
const contextChain = generator.current.contextChain.concat( listName, node.context, indexName );
generator.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: generator.current
};
},
leave ( generator ) {
generator.addRenderer( generator.current );
generator.current = generator.current.parent;
}
};

234
compiler/generate/visitors/Element.js
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import deindent from '../utils/deindent.js';
import attributeLookup from '../attributes/lookup.js';
import createBinding from '../binding/index.js';
export default {
enter ( generator, node ) {
const name = generator.current.counter( node.name );
let namespace = name === 'svg' ? 'http://www.w3.org/2000/svg' : generator.current.namespace;
const initStatements = [];
const updateStatements = [];
const teardownStatements = [];
const allUsedContexts = new Set();
node.attributes.forEach( attribute => {
if ( attribute.type === 'Attribute' ) {
let metadata = attributeLookup[ attribute.name ];
if ( metadata && metadata.appliesTo && !~metadata.appliesTo.indexOf( node.name ) ) metadata = null;
if ( attribute.value === true ) {
// attributes without values, e.g. <textarea readonly>
if ( metadata ) {
initStatements.push( deindent`
${name}.${metadata.propertyName} = true;
` );
} else {
initStatements.push( deindent`
${name}.setAttribute( '${attribute.name}', true );
` );
}
// special case – autofocus. has to be handled in a bit of a weird way
if ( attribute.name === 'autofocus' ) {
generator.current.autofocus = name;
}
}
else if ( attribute.value.length === 1 ) {
const value = attribute.value[0];
let result = '';
if ( value.type === 'Text' ) {
// static attributes
result = JSON.stringify( value.data );
if ( metadata ) {
initStatements.push( deindent`
${name}.${metadata.propertyName} = ${result};
` );
} else {
initStatements.push( deindent`
${name}.setAttribute( '${attribute.name}', ${result} );
` );
}
// special case
// TODO this attribute must be static – enforce at compile time
if ( attribute.name === 'xmlns' ) {
namespace = value;
}
}
else {
// dynamic – but potentially non-string – attributes
generator.contextualise( value.expression );
result = `[✂${value.expression.start}-${value.expression.end}✂]`;
if ( metadata ) {
updateStatements.push( deindent`
${name}.${metadata.propertyName} = ${result};
` );
} else {
updateStatements.push( deindent`
${name}.setAttribute( '${attribute.name}', ${result} );
` );
}
}
}
else {
const value = ( attribute.value[0].type === 'Text' ? '' : `"" + ` ) + (
attribute.value.map( chunk => {
if ( chunk.type === 'Text' ) {
return JSON.stringify( chunk.data );
} else {
generator.addSourcemapLocations( chunk.expression );
generator.contextualise( chunk.expression );
return `( [✂${chunk.expression.start}-${chunk.expression.end}✂] )`;
}
}).join( ' + ' )
);
if ( metadata ) {
updateStatements.push( deindent`
${name}.${metadata.propertyName} = ${value};
` );
} else {
updateStatements.push( deindent`
${name}.setAttribute( '${attribute.name}', ${value} );
` );
}
}
}
else if ( attribute.type === 'EventHandler' ) {
// TODO verify that it's a valid callee (i.e. built-in or declared method)
generator.addSourcemapLocations( attribute.expression );
generator.code.insertRight( attribute.expression.start, 'component.' );
const usedContexts = new Set();
attribute.expression.arguments.forEach( arg => {
const contexts = generator.contextualise( arg, true );
contexts.forEach( context => {
usedContexts.add( context );
allUsedContexts.add( context );
});
});
// TODO hoist event handlers? can do `this.__component.method(...)`
const declarations = [...usedContexts].map( name => {
if ( name === 'root' ) return 'var root = this.__svelte.root;';
const listName = generator.current.listNames[ name ];
const indexName = generator.current.indexNames[ name ];
return `var ${listName} = this.__svelte.${listName}, ${indexName} = this.__svelte.${indexName}, ${name} = ${listName}[${indexName}]`;
});
const handlerName = generator.current.counter( `${attribute.name}Handler` );
const handlerBody = ( declarations.length ? declarations.join( '\n' ) + '\n\n' : '' ) + `[✂${attribute.expression.start}-${attribute.expression.end}✂];`;
if ( attribute.name in generator.events ) {
initStatements.push( deindent`
const ${handlerName} = template.events.${attribute.name}( ${name}, function ( event ) {
${handlerBody}
});
` );
teardownStatements.push( deindent`
${handlerName}.teardown();
` );
} else {
initStatements.push( deindent`
function ${handlerName} ( event ) {
${handlerBody}
}
${name}.addEventListener( '${attribute.name}', ${handlerName}, false );
` );
teardownStatements.push( deindent`
${name}.removeEventListener( '${attribute.name}', ${handlerName}, false );
` );
}
}
else if ( attribute.type === 'Binding' ) {
createBinding( node, name, attribute, generator.current, initStatements, updateStatements, teardownStatements, allUsedContexts );
}
else if ( attribute.type === 'Ref' ) {
generator.usesRefs = true;
initStatements.push( deindent`
component.refs.${attribute.name} = ${name};
` );
teardownStatements.push( deindent`
component.refs.${attribute.name} = null;
` );
}
else {
throw new Error( `Not implemented: ${attribute.type}` );
}
});
if ( allUsedContexts.size ) {
initStatements.push( deindent`
${name}.__svelte = {};
` );
const declarations = [...allUsedContexts].map( contextName => {
if ( contextName === 'root' ) return `${name}.__svelte.root = root;`;
const listName = generator.current.listNames[ contextName ];
const indexName = generator.current.indexNames[ contextName ];
return `${name}.__svelte.${listName} = ${listName};\n${name}.__svelte.${indexName} = ${indexName};`;
}).join( '\n' );
updateStatements.push( declarations );
}
initStatements.unshift(
namespace ?
`var ${name} = document.createElementNS( '${namespace}', '${node.name}' );` :
`var ${name} = document.createElement( '${node.name}' );`
);
teardownStatements.push( `${name}.parentNode.removeChild( ${name} );` );
generator.current.initStatements.push( initStatements.join( '\n' ) );
if ( updateStatements.length ) generator.current.updateStatements.push( updateStatements.join( '\n' ) );
generator.current.teardownStatements.push( teardownStatements.join( '\n' ) );
generator.current = Object.assign( {}, generator.current, {
namespace,
target: name,
parent: generator.current
});
},
leave ( generator ) {
const name = generator.current.target;
generator.current = generator.current.parent;
if ( generator.current.useAnchor && generator.current.target === 'target' ) {
generator.current.initStatements.push( deindent`
anchor.parentNode.insertBefore( ${name}, anchor );
` );
} else {
generator.current.initStatements.push( deindent`
${generator.current.target}.appendChild( ${name} );
` );
}
}
};

80
compiler/generate/visitors/IfBlock.js
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import deindent from '../utils/deindent.js';
import isReference from '../utils/isReference.js';
import counter from '../utils/counter.js';
export default {
enter ( generator, node ) {
const i = generator.counters.if++;
const name = `ifBlock_${i}`;
const renderer = `renderIfBlock_${i}`;
generator.current.initStatements.push( deindent`
var ${name}_anchor = document.createComment( ${JSON.stringify( `#if ${generator.template.slice( node.expression.start, node.expression.end )}` )} );
${generator.current.target}.appendChild( ${name}_anchor );
var ${name} = null;
` );
generator.addSourcemapLocations( node.expression );
const usedContexts = generator.contextualise( node.expression );
const snippet = `[✂${node.expression.start}-${node.expression.end}✂]`;
let expression;
if ( isReference( node.expression ) ) {
const reference = `${generator.template.slice( node.expression.start, node.expression.end )}`;
expression = usedContexts[0] === 'root' ? `root.${reference}` : reference;
generator.current.updateStatements.push( deindent`
if ( ${snippet} && !${name} ) {
${name} = ${renderer}( component, ${generator.current.target}, ${name}_anchor );
}
` );
} else {
expression = `${name}_value`;
generator.current.updateStatements.push( deindent`
var ${expression} = ${snippet};
if ( ${expression} && !${name} ) {
${name} = ${renderer}( component, ${generator.current.target}, ${name}_anchor );
}
` );
}
generator.current.updateStatements.push( deindent`
else if ( !${expression} && ${name} ) {
${name}.teardown();
${name} = null;
}
if ( ${name} ) {
${name}.update( ${generator.current.contextChain.join( ', ' )} );
}
` );
generator.current.teardownStatements.push( deindent`
if ( ${name} ) ${name}.teardown();
${name}_anchor.parentNode.removeChild( ${name}_anchor );
` );
generator.current = Object.assign( {}, generator.current, {
useAnchor: true,
name: renderer,
target: 'target',
initStatements: [],
updateStatements: [],
teardownStatements: [],
counter: counter(),
parent: generator.current
});
},
leave ( generator ) {
generator.addRenderer( generator.current );
generator.current = generator.current.parent;
}
};

41
compiler/generate/visitors/MustacheTag.js
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import deindent from '../utils/deindent.js';
import isReference from '../utils/isReference.js';
export default {
enter ( generator, node ) {
const name = generator.current.counter( 'text' );
generator.current.initStatements.push( deindent`
var ${name} = document.createTextNode( '' );
var ${name}_value = '';
${generator.current.target}.appendChild( ${name} );
` );
generator.addSourcemapLocations( node.expression );
const usedContexts = generator.contextualise( node.expression );
const snippet = `[✂${node.expression.start}-${node.expression.end}✂]`;
if ( isReference( node.expression ) ) {
const reference = `${generator.template.slice( node.expression.start, node.expression.end )}`;
const qualified = usedContexts[0] === 'root' ? `root.${reference}` : reference;
generator.current.updateStatements.push( deindent`
if ( ${snippet} !== ${name}_value ) {
${name}_value = ${qualified};
${name}.data = ${name}_value;
}
` );
} else {
const temp = generator.getName( 'temp' );
generator.current.updateStatements.push( deindent`
var ${temp} = ${snippet};
if ( ${temp} !== ${name}_value ) {
${name}_value = ${temp};
${name}.data = ${name}_value;
}
` );
}
}
};

9
compiler/generate/visitors/Text.js
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import deindent from '../utils/deindent.js';
export default {
enter ( generator, node ) {
generator.current.initStatements.push( deindent`
${generator.current.target}.appendChild( document.createTextNode( ${JSON.stringify( node.data )} ) );
` );
}
};

15
compiler/generate/visitors/index.js
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import Comment from './Comment.js';
import EachBlock from './EachBlock.js';
import Element from './Element.js';
import IfBlock from './IfBlock.js';
import MustacheTag from './MustacheTag.js';
import Text from './Text.js';
export default {
Comment,
EachBlock,
Element,
IfBlock,
MustacheTag,
Text
};
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