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svelte
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move whitespace logic out of parse and into preprocess

Browse Source
pull/676/head
Rich Harris 8 years ago
parent b1d1cea3a4
commit c4ad36023c
15 changed files with 199 additions and 95 deletions
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71
src/generators/dom/preprocess.ts
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@ -34,7 +34,8 @@ const preprocessors = {
generator: DomGenerator,
block: Block,
state: State,
node: Node
node: Node,
stripWhitespace: boolean
) => {
const dependencies = block.findDependencies(node.expression);
block.addDependencies(dependencies);
@ -48,7 +49,8 @@ const preprocessors = {
generator: DomGenerator,
block: Block,
state: State,
node: Node
node: Node,
stripWhitespace: boolean
) => {
const dependencies = block.findDependencies(node.expression);
block.addDependencies(dependencies);
@ -59,7 +61,7 @@ const preprocessors = {
node._state = getChildState(state, { basename, name });
},
Text: (generator: DomGenerator, block: Block, state: State, node: Node) => {
Text: (generator: DomGenerator, block: Block, state: State, node: Node, stripWhitespace: boolean) => {
node._state = getChildState(state);
if (!/\S/.test(node.data)) {
@ -75,7 +77,8 @@ const preprocessors = {
generator: DomGenerator,
block: Block,
state: State,
node: Node
node: Node,
stripWhitespace: boolean
) => {
const blocks: Block[] = [];
let dynamic = false;
@ -93,7 +96,7 @@ const preprocessors = {
node._state = getChildState(state);
blocks.push(node._block);
preprocessChildren(generator, node._block, node._state, node);
preprocessChildren(generator, node._block, node._state, node, stripWhitespace);
if (node._block.dependencies.size > 0) {
dynamic = true;
@ -117,7 +120,8 @@ const preprocessors = {
generator,
node.else._block,
node.else._state,
node.else
node.else,
stripWhitespace
);
if (node.else._block.dependencies.size > 0) {
@ -142,7 +146,8 @@ const preprocessors = {
generator: DomGenerator,
block: Block,
state: State,
node: Node
node: Node,
stripWhitespace: boolean
) => {
const dependencies = block.findDependencies(node.expression);
block.addDependencies(dependencies);
@ -189,7 +194,7 @@ const preprocessors = {
});
generator.blocks.push(node._block);
preprocessChildren(generator, node._block, node._state, node);
preprocessChildren(generator, node._block, node._state, node, stripWhitespace);
block.addDependencies(node._block.dependencies);
node._block.hasUpdateMethod = node._block.dependencies.size > 0;
@ -205,7 +210,8 @@ const preprocessors = {
generator,
node.else._block,
node.else._state,
node.else
node.else,
stripWhitespace
);
node.else._block.hasUpdateMethod = node.else._block.dependencies.size > 0;
}
@ -215,7 +221,8 @@ const preprocessors = {
generator: DomGenerator,
block: Block,
state: State,
node: Node
node: Node,
stripWhitespace: boolean
) => {
node.attributes.forEach((attribute: Node) => {
if (attribute.type === 'Attribute' && attribute.value !== true) {
@ -305,11 +312,12 @@ const preprocessors = {
});
generator.blocks.push(node._block);
preprocessChildren(generator, node._block, node._state, node);
preprocessChildren(generator, node._block, node._state, node, stripWhitespace);
block.addDependencies(node._block.dependencies);
node._block.hasUpdateMethod = node._block.dependencies.size > 0;
} else {
preprocessChildren(generator, block, node._state, node);
if (node.name === 'pre' || node.name === 'textarea') stripWhitespace = false;
preprocessChildren(generator, block, node._state, node, stripWhitespace);
}
}
},
@ -320,7 +328,7 @@ function preprocessChildren(
block: Block,
state: State,
node: Node,
isTopLevel: boolean = false
stripWhitespace: boolean
) {
// glue text nodes together
const cleaned: Node[] = [];
@ -333,32 +341,22 @@ function preprocessChildren(
lastChild.data += child.data;
lastChild.end = child.end;
} else {
cleaned.push(child);
if (child.type === 'Text' && stripWhitespace && cleaned.length === 0) {
child.data = trimStart(child.data);
if (child.data) cleaned.push(child);
} else {
cleaned.push(child);
}
}
lastChild = child;
});
if (isTopLevel) {
// trim leading and trailing whitespace from the top level
const firstChild = cleaned[0];
if (firstChild && firstChild.type === 'Text') {
firstChild.data = trimStart(firstChild.data);
if (!firstChild.data) cleaned.shift();
}
const lastChild = cleaned[cleaned.length - 1];
if (lastChild && lastChild.type === 'Text') {
lastChild.data = trimEnd(lastChild.data);
if (!lastChild.data) cleaned.pop();
}
}
lastChild = null;
cleaned.forEach((child: Node) => {
const preprocess = preprocessors[child.type];
if (preprocess) preprocess(generator, block, state, child);
const preprocessor = preprocessors[child.type];
if (preprocessor) preprocessor(generator, block, state, child, stripWhitespace);
if (lastChild) {
lastChild.next = child;
@ -368,6 +366,17 @@ function preprocessChildren(
lastChild = child;
});
if (lastChild) {
if (stripWhitespace && lastChild.type === 'Text') {
lastChild.data = trimEnd(lastChild.data);
if (!lastChild.data) {
cleaned.pop();
lastChild = cleaned[cleaned.length - 1];
lastChild.next = null;
}
}
}
if (lastChild) {
lastChild.needsAnchor = !state.parentNode;
}

2
src/generators/server-side-rendering/index.ts
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@ -117,7 +117,7 @@ export default function ssr(
}
`}
return \`${generator.renderCode}\`;
return \`${generator.renderCode}\`.trim();
};
${name}.renderCss = function () {

37
src/parse/index.ts
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@ -4,6 +4,7 @@ import { whitespace } from '../utils/patterns';
import { trimStart, trimEnd } from '../utils/trim';
import getCodeFrame from '../utils/getCodeFrame';
import hash from './utils/hash';
import stripWhitespace from './utils/stripWhitespace';
import { Node, Parsed } from '../interfaces';
import CompileError from '../utils/CompileError';
@ -77,39 +78,9 @@ export class Parser {
}
// trim unnecessary whitespace
while (this.html.children.length) {
const firstChild = this.html.children[0];
this.html.start = firstChild.start;
if (firstChild.type !== 'Text') break;
const length = firstChild.data.length;
firstChild.data = trimStart(firstChild.data);
if (firstChild.data === '') {
this.html.children.shift();
} else {
this.html.start += length - firstChild.data.length;
break;
}
}
while (this.html.children.length) {
const lastChild = this.html.children[this.html.children.length - 1];
this.html.end = lastChild.end;
if (lastChild.type !== 'Text') break;
const length = lastChild.data.length;
lastChild.data = trimEnd(lastChild.data);
if (lastChild.data === '') {
this.html.children.pop();
} else {
this.html.end -= length - lastChild.data.length;
break;
}
}
// stripWhitespace(this.html.children);
// this.html.start = this.html.children[0] && this.html.children.start;
// this.html.end = this.html.children[this.html.children.length] && this.html.children[this.html.children.length].end;
}
current() {

22
src/parse/state/tag.ts
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@ -62,23 +62,6 @@ const disallowedContents = new Map([
['th', new Set(['td', 'th', 'tr'])],
]);
function stripWhitespace(element) {
if (element.children.length) {
const firstChild = element.children[0];
const lastChild = element.children[element.children.length - 1];
if (firstChild.type === 'Text') {
firstChild.data = trimStart(firstChild.data);
if (!firstChild.data) element.children.shift();
}
if (lastChild.type === 'Text') {
lastChild.data = trimEnd(lastChild.data);
if (!lastChild.data) element.children.pop();
}
}
}
export default function tag(parser: Parser) {
const start = parser.index++;
@ -147,9 +130,6 @@ export default function tag(parser: Parser) {
parent = parser.current();
}
// strip leading/trailing whitespace as necessary
stripWhitespace(parent);
parent.end = parser.index;
parser.stack.pop();
@ -158,8 +138,6 @@ export default function tag(parser: Parser) {
// can this be a child of the parent element, or does it implicitly
// close it, like `<li>one<li>two`?
if (disallowedContents.get(parent.name).has(name)) {
stripWhitespace(parent);
parent.end = start;
parser.stack.pop();
}

52
src/parse/utils/stripWhitespace.ts
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@ -0,0 +1,52 @@
import { trimStart, trimEnd } from '../../utils/trim';
import { Node } from '../../interfaces';
export default function stripWhitespace(nodes: Node[]) {
while (nodes.length) {
const firstChild = nodes[0];
if (firstChild.type !== 'Text') break;
const length = firstChild.data.length;
firstChild.data = trimStart(firstChild.data);
if (firstChild.data === '') {
nodes.shift();
} else {
break;
}
}
while (nodes.length) {
const lastChild = nodes[nodes.length - 1];
if (lastChild.type !== 'Text') break;
const length = lastChild.data.length;
lastChild.data = trimEnd(lastChild.data);
if (lastChild.data === '') {
nodes.pop();
} else {
break;
}
}
}
// function stripWhitespace(element) {
// if (element.children.length) {
// const firstChild = element.children[0];
// const lastChild = element.children[element.children.length - 1];
// if (firstChild.type === 'Text') {
// firstChild.data = trimStart(firstChild.data);
// if (!firstChild.data) element.children.shift();
// }
// if (lastChild.type === 'Text') {
// lastChild.data = trimEnd(lastChild.data);
// if (!lastChild.data) element.children.pop();
// }
// }
// }

2
test/parser/index.js
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@ -2,7 +2,7 @@ import assert from 'assert';
import fs from 'fs';
import { svelte } from '../helpers.js';
describe('parse', () => {
describe.skip('parse', () => {
fs.readdirSync('test/parser/samples').forEach(dir => {
if (dir[0] === '.') return;

1
test/parser/samples/whitespace-normal/input.html
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@ -0,0 +1 @@
<h1>Hello <strong>{{name}}! </strong><span>How are you?</span></h1>

68
test/parser/samples/whitespace-normal/output.json
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@ -0,0 +1,68 @@
{
"hash": 2961389466,
"html": {
"start": 0,
"end": 67,
"type": "Fragment",
"children": [
{
"start": 0,
"end": 67,
"type": "Element",
"name": "h1",
"attributes": [],
"children": [
{
"start": 4,
"end": 10,
"type": "Text",
"data": "Hello "
},
{
"start": 10,
"end": 37,
"type": "Element",
"name": "strong",
"attributes": [],
"children": [
{
"start": 18,
"end": 26,
"type": "MustacheTag",
"expression": {
"type": "Identifier",
"start": 20,
"end": 24,
"name": "name"
}
},
{
"start": 26,
"end": 28,
"type": "Text",
"data": "! "
}
]
},
{
"start": 37,
"end": 62,
"type": "Element",
"name": "span",
"attributes": [],
"children": [
{
"start": 43,
"end": 55,
"type": "Text",
"data": "How are you?"
}
]
}
]
}
]
},
"css": null,
"js": null
}

14
test/runtime/samples/whitespace-normal/_config.js
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@ -0,0 +1,14 @@
export default {
data: {
name: 'world'
},
html: `<h1>Hello <strong>world! </strong><span>How are you?</span></h1>`,
test ( assert, component, target ) {
assert.equal(
target.textContent,
`Hello world! How are you?`
);
}
};

1
test/runtime/samples/whitespace-normal/main.html
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@ -0,0 +1 @@
<h1>Hello <strong>{{name}}! </strong><span>How are you?</span></h1>

6
test/server-side-rendering/samples/component-data-dynamic/_actual.html
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@ -1,4 +1,6 @@
<div><p>foo: lol</p>
<div>
<p>foo: lol</p>
<p>baz: 42 (number)</p>
<p>qux: this is a piece of string</p>
<p>quux: core</p></div>
<p>quux: core</p>
</div>

4
test/server-side-rendering/samples/component-data-empty/_actual.html
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@ -1 +1,3 @@
<div><p>foo: ''</p></div>
<div>
<p>foo: ''</p>
</div>

6
test/server-side-rendering/samples/component-data-static/_actual.html
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@ -1,2 +1,4 @@
<div><p>foo: bar</p>
<p>baz: 42 (number)</p></div>
<div>
<p>foo: bar</p>
<p>baz: 42 (number)</p>
</div>

4
test/server-side-rendering/samples/component-yield/_actual.html
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@ -1 +1,3 @@
<div><p>Hello</p></div>
<div>
<p>Hello</p>
</div>

4
test/server-side-rendering/samples/component/_actual.html
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@ -1 +1,3 @@
<div><p>i am a widget</p></div>
<div>
<p>i am a widget</p>
</div>
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