mirror of https://github.com/sveltejs/svelte
- relax validation in some places where we know the HTML will not break or only break when using SSR - consolidate validation in one place and for better reuse, which results in more cases getting caught at runtime closes #11941pull/12618/head
Simon Holthausen
1 year ago
parent
3515776009
commit
78ed8e40d4
@ -0,0 +1,250 @@
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/**
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* Map of elements that have certain elements that are not allowed inside them, in the sense that they will auto-close the parent/ancestor element.
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* Theoretically one could take advantage of it but most of the time it will just result in confusing behavior and break when SSR'd.
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* There are more elements that are invalid inside other elements, but they're not auto-closed and so don't break SSR and are therefore not listed here.
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* @type {Record<string, { direct: string[]} | { descendant: string[] }>}
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*/
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const autoclosing_children = {
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// based on http://developers.whatwg.org/syntax.html#syntax-tag-omission
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li: { direct: ['li'] },
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dt: { descendant: ['dt', 'dd'] },
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dd: { descendant: ['dt', 'dd'] },
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p: {
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descendant: [
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'address',
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'article',
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'aside',
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'blockquote',
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'div',
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'dl',
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'fieldset',
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'footer',
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'form',
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'h1',
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'h2',
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'h3',
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'h4',
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'h5',
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'h6',
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'header',
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'hgroup',
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'hr',
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'main',
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'menu',
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'nav',
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'ol',
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'p',
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'pre',
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'section',
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'table',
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'ul'
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]
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},
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rt: { descendant: ['rt', 'rp'] },
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rp: { descendant: ['rt', 'rp'] },
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optgroup: { descendant: ['optgroup'] },
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option: { descendant: ['option', 'optgroup'] },
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thead: { direct: ['tbody', 'tfoot'] },
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tbody: { direct: ['tbody', 'tfoot'] },
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tfoot: { direct: ['tbody'] },
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tr: { direct: ['tr', 'tbody'] },
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td: { direct: ['td', 'th', 'tr'] },
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th: { direct: ['td', 'th', 'tr'] }
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};
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const interactive_elements = [
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// while `input` is also an interactive element, it is never moved by the browser, so we don't need to check for it
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'a',
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'button',
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'iframe',
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'embed',
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'select',
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'textarea'
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];
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for (const interactive_element of interactive_elements) {
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autoclosing_children[interactive_element] = { descendant: interactive_elements };
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}
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/**
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* Returns true if the tag is either the last in the list of siblings and will be autoclosed,
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* or not allowed inside the parent tag such that it will auto-close it. The latter results
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* in the browser repairing the HTML, which will likely result in an error during hydration.
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* @param {string} current
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* @param {string} [next]
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*/
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export function closing_tag_omitted(current, next) {
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const disallowed = autoclosing_children[current];
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if (disallowed) {
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if (
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!next ||
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('direct' in disallowed ? disallowed.direct : disallowed.descendant).includes(next)
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) {
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return true;
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}
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}
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return false;
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}
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/**
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* Map of elements that have certain elements that are not allowed inside them, in the sense that the browser will somehow repair the HTML.
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* There are more elements that are invalid inside other elements, but they're not repaired and so don't break SSR and are therefore not listed here.
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* @type {Record<string, { direct: string[]} | { descendant: string[] } | { only: string[] }>}
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*/
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const disallowed_children = {
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...autoclosing_children,
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form: { descendant: ['form'] },
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a: { descendant: ['a'] },
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button: { descendant: ['button'] },
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select: { only: ['option', 'optgroup', '#text', 'hr', 'script', 'template'] }
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};
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/**
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* Returns false if the tag is not allowed inside the ancestor tag (which is grandparent and above) such that it will result
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* in the browser repairing the HTML, which will likely result in an error during hydration.
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* @param {string} tag
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* @param {string | null} ancestor Must not be the parent, but higher up the tree
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* @returns {boolean}
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*/
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export function is_tag_valid_with_ancestor(tag, ancestor) {
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const disallowed = ancestor && autoclosing_children[ancestor];
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return !disallowed || ('descendant' in disallowed ? !disallowed.descendant.includes(tag) : true);
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}
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// https://html.spec.whatwg.org/multipage/syntax.html#generate-implied-end-tags
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const implied_end_tags = ['dd', 'dt', 'li', 'option', 'optgroup', 'p', 'rp', 'rt'];
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/**
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* Returns false if the tag is not allowed inside the parent tag such that it will result
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* in the browser repairing the HTML, which will likely result in an error during hydration.
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* @param {string} tag
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* @param {string | null} parent_tag
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* @returns {boolean}
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*/
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export function is_tag_valid_with_parent(tag, parent_tag) {
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const disallowed = parent_tag && autoclosing_children[parent_tag];
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if (
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disallowed &&
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('direct' in disallowed ? disallowed.direct : disallowed.descendant).includes(tag)
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) {
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return false;
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}
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// First, let's check if we're in an unusual parsing mode...
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switch (parent_tag) {
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// https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inselect
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case 'select':
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return (
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tag === 'option' ||
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tag === 'optgroup' ||
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tag === '#text' ||
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tag === 'hr' ||
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tag === 'script' ||
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tag === 'template'
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);
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case 'optgroup':
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return tag === 'option' || tag === '#text';
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// Strictly speaking, seeing an <option> doesn't mean we're in a <select>
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// but
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case 'option':
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return tag === '#text';
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// https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-intd
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// https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-incaption
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// No special behavior since these rules fall back to "in body" mode for
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// all except special table nodes which cause bad parsing behavior anyway.
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// https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-intr
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case 'tr':
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return (
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tag === 'th' || tag === 'td' || tag === 'style' || tag === 'script' || tag === 'template'
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);
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// https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-intbody
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case 'tbody':
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case 'thead':
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case 'tfoot':
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return tag === 'tr' || tag === 'style' || tag === 'script' || tag === 'template';
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// https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-incolgroup
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case 'colgroup':
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return tag === 'col' || tag === 'template';
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// https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-intable
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case 'table':
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return (
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tag === 'caption' ||
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tag === 'colgroup' ||
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tag === 'tbody' ||
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tag === 'tfoot' ||
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tag === 'thead' ||
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tag === 'style' ||
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tag === 'script' ||
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tag === 'template'
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);
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// https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inhead
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case 'head':
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return (
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tag === 'base' ||
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tag === 'basefont' ||
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tag === 'bgsound' ||
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tag === 'link' ||
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tag === 'meta' ||
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tag === 'title' ||
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tag === 'noscript' ||
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tag === 'noframes' ||
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tag === 'style' ||
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tag === 'script' ||
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tag === 'template'
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);
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// https://html.spec.whatwg.org/multipage/semantics.html#the-html-element
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case 'html':
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return tag === 'head' || tag === 'body' || tag === 'frameset';
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case 'frameset':
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return tag === 'frame';
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case '#document':
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return tag === 'html';
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}
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// Probably in the "in body" parsing mode, so we outlaw only tag combos
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// where the parsing rules cause implicit opens or closes to be added.
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// https://html.spec.whatwg.org/multipage/syntax.html#parsing-main-inbody
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switch (tag) {
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case 'h1':
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case 'h2':
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case 'h3':
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case 'h4':
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case 'h5':
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case 'h6':
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return (
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parent_tag !== 'h1' &&
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parent_tag !== 'h2' &&
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parent_tag !== 'h3' &&
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parent_tag !== 'h4' &&
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parent_tag !== 'h5' &&
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parent_tag !== 'h6'
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);
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case 'rp':
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case 'rt':
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return parent_tag == null || implied_end_tags.indexOf(parent_tag) === -1;
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case 'body':
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case 'caption':
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case 'col':
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case 'colgroup':
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case 'frameset':
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case 'frame':
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case 'head':
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case 'html':
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case 'tbody':
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case 'td':
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case 'tfoot':
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case 'th':
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case 'thead':
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case 'tr':
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// These tags are only valid with a few parents that have special child
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// parsing rules -- if we're down here, then none of those matched and
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// so we allow it only if we don't know what the parent is, as all other
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// cases are invalid.
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return parent_tag == null;
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}
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return true;
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}
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@ -0,0 +1 @@
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<form></form>
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@ -1,7 +1,11 @@
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<script>
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import Component from "./Component.svelte";
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import Form from './form.svelte';
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import H1 from './h1.svelte';
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</script>
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<p>
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<Component />
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<H1 />
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</p>
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<form>
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<Form />
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</form>
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@ -0,0 +1,9 @@
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<div>
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<form>
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{#if foo}
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<form>
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<input />
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</form>
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{/if}
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</form>
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</div>
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@ -0,0 +1,14 @@
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[
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{
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"code": "node_invalid_placement_ssr",
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"message": "<form> is invalid inside <form>. When rendering this component on the server, the resulting HTML will be modified by the browser, likely resulting in a `hydration_mismatch` warning",
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"start": {
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"line": 4,
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"column": 3
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},
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"end": {
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"line": 6,
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"column": 10
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}
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}
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]
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