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Respect Prettier's behaviour for self closing elements #328

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5 changes: 5 additions & 0 deletions .changeset/rich-keys-bake.md
Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'prettier-plugin-astro': minor
---

Updated self-closing behaviour to be more in line with Prettier's HTML formatter
43 changes: 31 additions & 12 deletions src/printer/elements.ts
Original file line number Diff line number Diff line change
@@ -1,31 +1,50 @@
export type TagName = keyof HTMLElementTagNameMap | 'svg';
export type TagName = keyof HTMLElementTagNameMap | keyof SVGElementTagNameMap;

// https://github.com/prettier/prettier/blob/main/vendors/html-void-elements.json
export const selfClosingTags = [
export const selfClosingTags: TagName[] = [
'area',
'base',
'basefont',
'bgsound',
'br',
'col',
'command',
'embed',
'frame',
'hr',
'image',
'img',
'input',
'isindex',
'keygen',
'link',
'menuitem',
'meta',
'nextid',
'param',
'slot',
'source',
'track',
'wbr',

// The SVG spec doesn't really have a concept of void elements, everything is allowed
// However, some tags are very commonly self-closed by users, and as such they find it confusing for them to not be closed
'circle',
'ellipse',
'line',
'path',
'polygon',
'polyline',
'rect',
'stop',
'use',

// Filters
'feBlend',
'feColorMatrix',
'feComponentTransfer',
'feComposite',
'feConvolveMatrix',
'feDiffuseLighting',
'feDisplacementMap',
'feFlood',
'feGaussianBlur',
'feMerge',
'feMorphology',
'feOffset',
'feSpecularLighting',
'feTile',
'feTurbulence',
];

// https://developer.mozilla.org/en-US/docs/Web/HTML/Block-level_elements#Elements
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12 changes: 7 additions & 5 deletions src/printer/index.ts
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
import { Doc } from 'prettier';
import { selfClosingTags } from './elements';
import { selfClosingTags, type TagName } from './elements';
import { TextNode } from './nodes';
import {
AstPath,
Expand Down Expand Up @@ -130,16 +130,18 @@ export function print(path: AstPath, opts: ParserOptions, print: printFn): Doc {

/**
* An element is allowed to self close only if:
* It's already self-closing OR
* It is empty AND
* It's a component OR
* It's in the HTML spec as a void element OR
* It has a `set:*` directive
*/
const isSelfClosingTag =
isEmpty &&
(node.type === 'component' ||
selfClosingTags.includes(node.name) ||
hasSetDirectives(node));
(node.position?.end && opts.originalText.at(opts.locEnd(node) - 1) == '/') ||
(isEmpty &&
(node.type === 'component' ||
selfClosingTags.includes(node.name as TagName) ||
hasSetDirectives(node)));

const isSingleLinePerAttribute = opts.singleAttributePerLine && node.attributes.length > 1;
const attributeLine = isSingleLinePerAttribute ? breakParent : '';
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