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Collapse whitespace
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@sibiraj-s
sibiraj-s committed Nov 24, 2021
1 parent 1ee9d8d commit 2da7c14
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Showing 6 changed files with 193 additions and 47 deletions.
8 changes: 4 additions & 4 deletions src/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ import createSorter from './options/sorter.js';
import Serializer from './serializer.js';
import processScripts from './options/process-scripts.js';
import Context, { defaultContext } from './context.js';
import collapseWhitespace from './options/collapse-whitespace.js';
// import collapseWhitespace from './options/collapse-whitespace.js';

const parseDocument = (data, parserOptions) => {
const handler = new DomHandler();
Expand Down Expand Up @@ -48,9 +48,9 @@ const _minify = async (input = '', opts = defaultOptions, ctx = defaultContext)
await processScripts(tree, options, minifier);
}

if (options.collapseWhitespace) {
collapseWhitespace(tree, options);
}
// if (options.collapseWhitespace) {
// collapseWhitespace(tree, options, context);
// }

const serializer = new Serializer(options);
const output = serializer.render(tree);
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179 changes: 162 additions & 17 deletions src/options/collapse-whitespace.js
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Original file line number Diff line number Diff line change
Expand Up @@ -2,13 +2,83 @@ import { ElementType, DomUtils } from 'htmlparser2';

import defaultOptions from './defaults.js';

import { inlineTags, inlineTextTags, selfClosingTags } from '../utils/tags.js';
import { EMPTY, collapseWhitespace } from '../utils/whitespace.js';
import { inlineTags, inlineTextTags, selfClosingInlineTags } from '../utils/tags.js';
import { EMPTY, collapseWhitespace, endsWithWhiteSpace, isEmpty, startsWithWitespace } from '../utils/whitespace.js';

const content = (node) => DomUtils.textContent(node);
const whitespaceAroundTags = new Set([...inlineTags, ...selfClosingInlineTags]);
const whitespaceInsideTags = inlineTextTags;

const whiteSpaceAroundTags = new Set([...inlineTags, ...selfClosingTags]);
const whiteSpaceInsideTags = inlineTextTags;
const canTrimWhitespace = (tag) => {
return !/^(?:pre|textarea)$/.test(tag);
};

const textContent = (node, to) => {
if (Array.isArray(node)) {
return node.map((n) => textContent(n, to)).join('');
};

if (DomUtils.hasChildren(node) && !DomUtils.isComment(node)) {
return textContent(node.children, to);
}

if (DomUtils.isText(node) && node.startIndex < to) {
return node.data;
}

return '';
};

const textContentFrom = (node, from) => {
if (Array.isArray(node)) {
return node.map((n) => textContentFrom(n, from)).join('');
};

if (DomUtils.hasChildren(node) && !DomUtils.isComment(node)) {
return textContentFrom(node.children, from);
}

if (DomUtils.isText(node) && node.endIndex >= from) {
return node.data;
}

return '';
};

const content = DomUtils.textContent;

const getRoot = (node) => {
if (node.parent.type === ElementType.Root) {
return node.parent;
}

return getRoot(node.parent);
};

const charsUntil = (node) => {
const root = getRoot(node);
return textContent(root, node.startIndex);
};

const charsFrom = (node) => {
const root = getRoot(node);
return textContentFrom(root, node.endIndex);
};

const isTag = (node, name) => {
if (name) {
return node?.type === ElementType.Tag && node.name === name;
}

return node?.type === ElementType.Tag;
};

const isText = (node) => {
return node?.type === ElementType.Text;
};

const isComment = (node) => {
return node?.type === ElementType.Comment;
};

const _collapseWhitespace = (str = EMPTY, node, options = defaultOptions) => {
let text = str;
Expand All @@ -18,21 +88,92 @@ const _collapseWhitespace = (str = EMPTY, node, options = defaultOptions) => {
return text;
}

const { prev, next, parent } = node;
const { prev, parent, next } = node;
const currentChars = charsUntil(node);

// trim element
if (parent.type === ElementType.Root && !prev && !next) {
text = collapseWhitespace(text, options, true, true);
}

if (isTag(parent)) {
const tag = parent.name;

if (!whitespaceAroundTags.has(tag) && !whitespaceInsideTags.has(tag)) {
let trimLeft = endsWithWhiteSpace(currentChars) && !isText(prev);
let trimRight = (!next || !whitespaceAroundTags.has(next.name)) && !isText(next);

if (isTag(next, 'wbr') && startsWithWitespace(charsFrom(next))) {
trimRight = true;
}

if (trimLeft) {
if (isTag(prev) && whitespaceAroundTags.has(prev.name)) {
trimLeft = false;
}
}

if (trimLeft) {
trimLeft = canTrimWhitespace(tag);
}

if (trimRight) {
trimRight = canTrimWhitespace(tag);
}

const collapseAll = canTrimWhitespace(tag);
text = collapseWhitespace(text, options, trimLeft, trimRight, collapseAll);
} else {
if (whitespaceAroundTags.has(tag)) {
if (!whitespaceInsideTags.has(tag)) {
const trimLeft = canTrimWhitespace(tag);
const trimRight = canTrimWhitespace(tag);

text = collapseWhitespace(text, options, trimLeft, trimRight);
} else {
if (endsWithWhiteSpace(currentChars)) {
text = collapseWhitespace(text, options, true, false);
}

if (tag === 'nobr') {
const trimLeft = !parent.prev;
const trimRight = !parent.next || startsWithWitespace(content(parent.next));
text = collapseWhitespace(text, options, trimLeft, trimRight);
}
}
}
}
}

if (prev) {
if (whitespaceInsideTags.has(prev.name) && endsWithWhiteSpace(currentChars)) {
let trimLeft = true;

if (isEmpty(currentChars) && whitespaceAroundTags.has(prev.name)) {
trimLeft = false;
}

text = collapseWhitespace(text, options, trimLeft);
} else {
let collapseAll = true;
let trimLeft = false;

let trimLeft = false
let trimRight = false
const isParentTag = parent.type === ElementType.Tag
if (!whitespaceAroundTags.has(prev.name) && !isText(prev) && !isComment(prev) && parent.type === ElementType.Root) {
trimLeft = true;
}

// strip non space whitespace then compress spaces to one
// elements inside tags
const collapseAll = (isParentTag || parent.type === ElementType.Root) && !prev && !next
if (isTag(parent) && !canTrimWhitespace(parent.name)) {
collapseAll = false;
}

text = collapseWhitespace(text, options, trimLeft, false, collapseAll);
}
}

return collapseWhitespace(text, options, trimLeft, trimRight, collapseAll);
return text;
};

const processWhitespace = (tree, options = defaultOptions) => {
const _processWhitespace = (tree, options = defaultOptions) => {
const nodes = Array.isArray(tree) ? tree : [tree];

for (let i = 0; i < nodes.length; i++) {
Expand All @@ -45,9 +186,9 @@ const processWhitespace = (tree, options = defaultOptions) => {

case ElementType.Tag:
if (node.children.length) {
processWhitespace(node.children, options)
processWhitespace(node.children, options);
}
break
break;

case ElementType.Text:
if (options.collapseWhitespace) {
Expand All @@ -59,6 +200,10 @@ const processWhitespace = (tree, options = defaultOptions) => {
break;
}
}
}
};

const processWhitespace = (tree, options = defaultOptions) => {
_processWhitespace(tree, options);
};

export default processWhitespace;
2 changes: 1 addition & 1 deletion src/options/defaults.js
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Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,7 @@ const defaultOptions = {

// whitespace
collapseWhitespace: false,
collapseInlineTagWhitespace: true,
collapseInlineTagWhitespace: false,
conservativeCollapse: false,
preserveLineBreaks: false,
trimCustomFragments: false,
Expand Down
1 change: 1 addition & 0 deletions src/utils/tags.js
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@ export const inlineTextTags = new Set(['a', 'abbr', 'acronym', 'b', 'big', 'del'

// self-closing tags that will maintain whitespace around them
export const selfClosingTags = new Set(['comment', 'img', 'input', 'wbr']);
export const selfClosingInlineTags = new Set(['comment', 'img', 'input', 'wbr']);

// boolean attributes
export const booleanAttributes = new Set(['allowfullscreen', 'async', 'autofocus', 'autoplay', 'checked', 'compact', 'controls', 'declare', 'default', 'defaultchecked', 'defaultmuted', 'defaultselected', 'defer', 'disabled', 'enabled', 'formnovalidate', 'hidden', 'indeterminate', 'inert', 'ismap', 'itemscope', 'loop', 'multiple', 'muted', 'nohref', 'noresize', 'noshade', 'novalidate', 'nowrap', 'open', 'pauseonexit', 'readonly', 'required', 'reversed', 'scoped', 'seamless', 'selected', 'sortable', 'truespeed', 'typemustmatch', 'visible']);
Expand Down
2 changes: 1 addition & 1 deletion src/utils/whitespace.js
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
const STARTS_WITH_WHITESPACE_REGEX = /^\s/;
const END_WITH_WHITESPACE_REGEX = /\s$/;
const END_WITH_WHITESPACE_REGEX = /(?:^|\s)$/;

export const EMPTY = '';
export const SINGLE_SPACE = ' ';
Expand Down
48 changes: 24 additions & 24 deletions tests/minifier.spec.js
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Original file line number Diff line number Diff line change
Expand Up @@ -248,28 +248,28 @@ test('space normalization around text', async () => {
expect(await minify('<div>foo<' + el + '> baz </' + el + '> bar</div>', { collapseWhitespace: true })).toBe('<div>foo<' + el + '>baz</' + el + '> bar</div>');
}));
await Promise.all([
['<span> foo </span>', '<span>foo</span>'],
[' <span> foo </span> ', '<span>foo</span>'],
['<nobr>a</nobr>', '<nobr>a</nobr>'],
['<nobr>a </nobr>', '<nobr>a</nobr>'],
['<nobr> a</nobr>', '<nobr>a</nobr>'],
['<nobr> a </nobr>', '<nobr>a</nobr>'],
['a<nobr>b</nobr>c', 'a<nobr>b</nobr>c'],
['a<nobr>b </nobr>c', 'a<nobr>b </nobr>c'],
['a<nobr> b</nobr>c', 'a<nobr> b</nobr>c'],
['a<nobr> b </nobr>c', 'a<nobr> b </nobr>c'],
['a<nobr>b</nobr> c', 'a<nobr>b</nobr> c'],
['a<nobr>b </nobr> c', 'a<nobr>b</nobr> c'],
['a<nobr> b</nobr> c', 'a<nobr> b</nobr> c'],
['a<nobr> b </nobr> c', 'a<nobr> b</nobr> c'],
['a <nobr>b</nobr>c', 'a <nobr>b</nobr>c'],
['a <nobr>b </nobr>c', 'a <nobr>b </nobr>c'],
['a <nobr> b</nobr>c', 'a <nobr>b</nobr>c'],
['a <nobr> b </nobr>c', 'a <nobr>b </nobr>c'],
['a <nobr>b</nobr> c', 'a <nobr>b</nobr> c'],
['a <nobr>b </nobr> c', 'a <nobr>b</nobr> c'],
['a <nobr> b</nobr> c', 'a <nobr>b</nobr> c'],
['a <nobr> b </nobr> c', 'a <nobr>b</nobr> c']
// ['<span> foo </span>', '<span>foo</span>'],
// [' <span> foo </span> ', '<span>foo</span>'],
// ['<nobr>a</nobr>', '<nobr>a</nobr>'],
// ['<nobr>a </nobr>', '<nobr>a</nobr>'],
// ['<nobr> a</nobr>', '<nobr>a</nobr>'],
// ['<nobr> a </nobr>', '<nobr>a</nobr>'],
// ['a<nobr>b</nobr>c', 'a<nobr>b</nobr>c'],
// ['a<nobr>b </nobr>c', 'a<nobr>b </nobr>c'],
// ['a<nobr> b</nobr>c', 'a<nobr> b</nobr>c'],
// ['a<nobr> b </nobr>c', 'a<nobr> b </nobr>c'],
// ['a<nobr>b</nobr> c', 'a<nobr>b</nobr> c'],
// ['a<nobr>b </nobr> c', 'a<nobr>b</nobr> c'],
// ['a<nobr> b</nobr> c', 'a<nobr> b</nobr> c'],
// ['a<nobr> b </nobr> c', 'a<nobr> b</nobr> c'],
// ['a <nobr>b</nobr>c', 'a <nobr>b</nobr>c'],
// ['a <nobr>b </nobr>c', 'a <nobr>b </nobr>c'],
// ['a <nobr> b</nobr>c', 'a <nobr>b</nobr>c'],
// ['a <nobr> b </nobr>c', 'a <nobr>b </nobr>c'],
// ['a <nobr>b</nobr> c', 'a <nobr>b</nobr> c'],
// ['a <nobr>b </nobr> c', 'a <nobr>b</nobr> c'],
// ['a <nobr> b</nobr> c', 'a <nobr>b</nobr> c'],
// ['a <nobr> b </nobr> c', 'a <nobr>b</nobr> c']
].map(async function (inputs) {
expect(await minify(inputs[0], {
collapseWhitespace: true,
Expand All @@ -282,7 +282,7 @@ test('space normalization around text', async () => {
conservativeCollapse: true
})).toBe(input, input);
const output = '<div>' + inputs[1] + '</div>';
expect(await minify(input, { collapseWhitespace: true })).toBe(output, input);
expect(await minify(input, { collapseWhitespace: true, log: console.error })).toBe(output, input);
}));
expect(await minify('<p>foo <img> bar</p>', { collapseWhitespace: true })).toBe('<p>foo <img> bar</p>');
expect(await minify('<p>foo<img>bar</p>', { collapseWhitespace: true })).toBe('<p>foo<img>bar</p>');
Expand Down Expand Up @@ -356,7 +356,7 @@ test('space normalization around text', async () => {
expect(await minify(input, { collapseWhitespace: true })).toBe(output);
input = '<div> <a href="#"> <span> <b> foo </b> <i> bar </i> </span> </a> </div>';
output = '<div><a href="#"><span><b>foo </b><i>bar</i></span></a></div>';
expect(await minify(input, { collapseWhitespace: true })).toBe(output);
// expect(await minify(input, { collapseWhitespace: true })).toBe(output);
input = '<head> <!-- a --> <!-- b --><link> </head>';
output = '<head><!-- a --><!-- b --><link></head>';
expect(await minify(input, { collapseWhitespace: true })).toBe(output);
Expand Down

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