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/** @import { AST, Directive, ElementLike, TemplateNode } from '#compiler' */
/** @import { Parser } from '../index.js' */
import { is_void } from '../../../../utils.js';
import read_expression from '../read/expression.js';
import { read_script } from '../read/script.js';
import read_style from '../read/style.js';
import { decode_character_references } from '../utils/html.js';
import * as e from '../../../errors.js';
import * as w from '../../../warnings.js';
import { create_fragment } from '../utils/create.js';
import { create_attribute, create_expression_metadata } from '../../nodes.js';
import { get_attribute_expression, is_expression_attribute } from '../../../utils/ast.js';
import { closing_tag_omitted } from '../../../../html-tree-validation.js';
import { list } from '../../../utils/string.js';
const regex_invalid_unquoted_attribute_value = /^(\/>|[\s"'=<>`])/;
const regex_closing_textarea_tag = /^<\/textarea(\s[^>]*)?>/i;
const regex_closing_comment = /-->/;
const regex_whitespace_or_slash_or_closing_tag = /(\s|\/|>)/;
const regex_token_ending_character = /[\s=/>"']/;
const regex_starts_with_quote_characters = /^["']/;
const regex_attribute_value = /^(?:"([^"]*)"|'([^'])*'|([^>\s]+))/;
const regex_valid_element_name =
/^(?:![a-zA-Z]+|[a-zA-Z](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?|[a-zA-Z][a-zA-Z0-9]*:[a-zA-Z][a-zA-Z0-9-]*[a-zA-Z0-9])$/;
export const regex_valid_component_name =
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Lexical_grammar#identifiers adjusted for our needs
// (must start with uppercase letter if no dots, can contain dots)
/^(?:\p{Lu}[$\u200c\u200d\p{ID_Continue}.]*|\p{ID_Start}[$\u200c\u200d\p{ID_Continue}]*(?:\.[$\u200c\u200d\p{ID_Continue}]+)+)$/u;
/** @type {Map<string, ElementLike['type']>} */
const root_only_meta_tags = new Map([
['svelte:head', 'SvelteHead'],
['svelte:options', 'SvelteOptions'],
['svelte:window', 'SvelteWindow'],
['svelte:document', 'SvelteDocument'],
['svelte:body', 'SvelteBody']
]);
/** @type {Map<string, ElementLike['type']>} */
const meta_tags = new Map([
...root_only_meta_tags,
['svelte:element', 'SvelteElement'],
['svelte:component', 'SvelteComponent'],
['svelte:self', 'SvelteSelf'],
['svelte:fragment', 'SvelteFragment']
]);
/** @param {Parser} parser */
export default function element(parser) {
const start = parser.index++;
let parent = parser.current();
if (parser.eat('!--')) {
const data = parser.read_until(regex_closing_comment);
parser.eat('-->', true);
/** @type {ReturnType<typeof parser.append<AST.Comment>>} */
parser.append({
type: 'Comment',
start,
end: parser.index,
data
});
return;
}
const is_closing_tag = parser.eat('/');
const name = parser.read_until(regex_whitespace_or_slash_or_closing_tag);
if (is_closing_tag) {
parser.allow_whitespace();
parser.eat('>', true);
if (is_void(name)) {
e.void_element_invalid_content(start);
}
// close any elements that don't have their own closing tags, e.g. <div><p></div>
while (/** @type {AST.RegularElement} */ (parent).name !== name) {
if (parent.type !== 'RegularElement') {
if (parser.last_auto_closed_tag && parser.last_auto_closed_tag.tag === name) {
e.element_invalid_closing_tag_autoclosed(start, name, parser.last_auto_closed_tag.reason);
} else {
e.element_invalid_closing_tag(start, name);
}
}
parent.end = start;
parser.pop();
parent = parser.current();
}
parent.end = parser.index;
parser.pop();
if (parser.last_auto_closed_tag && parser.stack.length < parser.last_auto_closed_tag.depth) {
parser.last_auto_closed_tag = undefined;
}
return;
}
if (name.startsWith('svelte:') && !meta_tags.has(name)) {
const bounds = { start: start + 1, end: start + 1 + name.length };
e.svelte_meta_invalid_tag(bounds, list(Array.from(meta_tags.keys())));
}
if (!regex_valid_element_name.test(name) && !regex_valid_component_name.test(name)) {
const bounds = { start: start + 1, end: start + 1 + name.length };
e.tag_invalid_name(bounds);
}
if (root_only_meta_tags.has(name)) {
if (name in parser.meta_tags) {
e.svelte_meta_duplicate(start, name);
}
if (parent.type !== 'Root') {
e.svelte_meta_invalid_placement(start, name);
}
parser.meta_tags[name] = true;
}
const type = meta_tags.has(name)
? meta_tags.get(name)
: regex_valid_component_name.test(name)
? 'Component'
: name === 'title' && parent_is_head(parser.stack)
? 'TitleElement'
: // TODO Svelte 6/7: once slots are removed in favor of snippets, always keep slot as a regular element
name === 'slot' && !parent_is_shadowroot_template(parser.stack)
? 'SlotElement'
: 'RegularElement';
/** @type {ElementLike} */
const element =
type === 'RegularElement'
? {
type,
start,
end: -1,
name,
attributes: [],
fragment: create_fragment(true),
metadata: {
svg: false,
mathml: false,
scoped: false,
has_spread: false,
path: []
},
parent: null
}
: /** @type {ElementLike} */ ({
type,
start,
end: -1,
name,
attributes: [],
fragment: create_fragment(true),
parent: null,
metadata: {
// unpopulated at first, differs between types
}
});
parser.allow_whitespace();
if (parent.type === 'RegularElement' && closing_tag_omitted(parent.name, name)) {
parent.end = start;
parser.pop();
parser.last_auto_closed_tag = {
tag: parent.name,
reason: name,
depth: parser.stack.length
};
}
/** @type {string[]} */
const unique_names = [];
const current = parser.current();
const is_top_level_script_or_style =
(name === 'script' || name === 'style') && current.type === 'Root';
const read = is_top_level_script_or_style ? read_static_attribute : read_attribute;
let attribute;
while ((attribute = read(parser))) {
// animate and transition can only be specified once per element so no need
// to check here, use can be used multiple times, same for the on directive
// finally let already has error handling in case of duplicate variable names
if (
attribute.type === 'Attribute' ||
attribute.type === 'BindDirective' ||
attribute.type === 'StyleDirective' ||
attribute.type === 'ClassDirective'
) {
// `bind:attribute` and `attribute` are just the same but `class:attribute`,
// `style:attribute` and `attribute` are different and should be allowed together
// so we concatenate the type while normalizing the type for BindDirective
const type = attribute.type === 'BindDirective' ? 'Attribute' : attribute.type;
if (unique_names.includes(type + attribute.name)) {
e.attribute_duplicate(attribute);
// <svelte:element bind:this this=..> is allowed
} else if (attribute.name !== 'this') {
unique_names.push(type + attribute.name);
}
}
element.attributes.push(attribute);
parser.allow_whitespace();
}
if (element.type === 'SvelteComponent') {
const index = element.attributes.findIndex(
/** @param {any} attr */
(attr) => attr.type === 'Attribute' && attr.name === 'this'
);
if (index === -1) {
e.svelte_component_missing_this(start);
}
const definition = /** @type {AST.Attribute} */ (element.attributes.splice(index, 1)[0]);
if (!is_expression_attribute(definition)) {
e.svelte_component_invalid_this(definition.start);
}
element.expression = get_attribute_expression(definition);
}
if (element.type === 'SvelteElement') {
const index = element.attributes.findIndex(
/** @param {any} attr */
(attr) => attr.type === 'Attribute' && attr.name === 'this'
);
if (index === -1) {
e.svelte_element_missing_this(start);
}
const definition = /** @type {AST.Attribute} */ (element.attributes.splice(index, 1)[0]);
if (definition.value === true) {
e.svelte_element_missing_this(definition);
}
if (!is_expression_attribute(definition)) {
w.svelte_element_invalid_this(definition);
// note that this is wrong, in the case of e.g. `this="h{n}"` — it will result in `<h>`.
// it would be much better to just error here, but we are preserving the existing buggy
// Svelte 4 behaviour out of an overabundance of caution regarding breaking changes.
// TODO in 6.0, error
const chunk = /** @type {Array<AST.ExpressionTag | AST.Text>} */ (definition.value)[0];
element.tag =
chunk.type === 'Text'
? {
type: 'Literal',
value: chunk.data,
raw: `'${chunk.raw}'`,
start: chunk.start,
end: chunk.end
}
: chunk.expression;
} else {
element.tag = get_attribute_expression(definition);
}
}
if (is_top_level_script_or_style) {
parser.eat('>', true);
/** @type {AST.Comment | null} */
let prev_comment = null;
for (let i = current.fragment.nodes.length - 1; i >= 0; i--) {
const node = current.fragment.nodes[i];
if (i === current.fragment.nodes.length - 1 && node.end !== start) {
break;
}
if (node.type === 'Comment') {
prev_comment = node;
break;
} else if (node.type !== 'Text' || node.data.trim()) {
break;
}
}
if (name === 'script') {
const content = read_script(parser, start, element.attributes);
if (prev_comment) {
// We take advantage of the fact that the root will never have leadingComments set,
// and set the previous comment to it so that the warning mechanism can later
// inspect the root and see if there was a html comment before it silencing specific warnings.
content.content.leadingComments = [{ type: 'Line', value: prev_comment.data }];
}
if (content.context === 'module') {
if (current.module) e.script_duplicate(start);
current.module = content;
} else {
if (current.instance) e.script_duplicate(start);
current.instance = content;
}
} else {
const content = read_style(parser, start, element.attributes);
content.content.comment = prev_comment;
if (current.css) e.style_duplicate(start);
current.css = content;
}
return;
}
parser.append(element);
const self_closing = parser.eat('/') || is_void(name);
parser.eat('>', true);
if (self_closing) {
// don't push self-closing elements onto the stack
element.end = parser.index;
} else if (name === 'textarea') {
// special case
element.fragment.nodes = read_sequence(
parser,
() => regex_closing_textarea_tag.test(parser.template.slice(parser.index)),
'inside <textarea>'
);
parser.read(regex_closing_textarea_tag);
element.end = parser.index;
} else if (name === 'script' || name === 'style') {
// special case
const start = parser.index;
const data = parser.read_until(new RegExp(`</${name}>`));
const end = parser.index;
/** @type {AST.Text} */
const node = {
start,
end,
type: 'Text',
data,
raw: data,
parent: null
};
element.fragment.nodes.push(node);
parser.eat(`</${name}>`, true);
element.end = parser.index;
} else {
parser.stack.push(element);
parser.fragments.push(element.fragment);
}
}
/** @param {TemplateNode[]} stack */
function parent_is_head(stack) {
let i = stack.length;
while (i--) {
const { type } = stack[i];
if (type === 'SvelteHead') return true;
if (type === 'RegularElement' || type === 'Component') return false;
}
return false;
}
/** @param {TemplateNode[]} stack */
function parent_is_shadowroot_template(stack) {
// https://developer.chrome.com/docs/css-ui/declarative-shadow-dom#building_a_declarative_shadow_root
let i = stack.length;
while (i--) {
if (
stack[i].type === 'RegularElement' &&
/** @type {AST.RegularElement} */ (stack[i]).attributes.some(
(a) => a.type === 'Attribute' && a.name === 'shadowrootmode'
)
) {
return true;
}
}
return false;
}
/**
* @param {Parser} parser
* @returns {AST.Attribute | null}
*/
function read_static_attribute(parser) {
const start = parser.index;
const name = parser.read_until(regex_token_ending_character);
if (!name) return null;
/** @type {true | Array<AST.Text | AST.ExpressionTag>} */
let value = true;
if (parser.eat('=')) {
parser.allow_whitespace();
let raw = parser.match_regex(regex_attribute_value);
if (!raw) {
e.expected_attribute_value(parser.index);
}
parser.index += raw.length;
const quoted = raw[0] === '"' || raw[0] === "'";
if (quoted) {
raw = raw.slice(1, -1);
}
value = [
{
start: parser.index - raw.length - (quoted ? 1 : 0),
end: quoted ? parser.index - 1 : parser.index,
type: 'Text',
raw: raw,
data: decode_character_references(raw, true),
parent: null
}
];
}
if (parser.match_regex(regex_starts_with_quote_characters)) {
e.expected_token(parser.index, '=');
}
return create_attribute(name, start, parser.index, value);
}
/**
* @param {Parser} parser
* @returns {AST.Attribute | AST.SpreadAttribute | Directive | null}
*/
function read_attribute(parser) {
const start = parser.index;
if (parser.eat('{')) {
parser.allow_whitespace();
if (parser.eat('...')) {
const expression = read_expression(parser);
parser.allow_whitespace();
parser.eat('}', true);
/** @type {AST.SpreadAttribute} */
const spread = {
type: 'SpreadAttribute',
start,
end: parser.index,
expression,
parent: null,
metadata: {
expression: create_expression_metadata()
}
};
return spread;
} else {
const value_start = parser.index;
const name = parser.read_identifier();
if (name === null) {
e.attribute_empty_shorthand(start);
}
parser.allow_whitespace();
parser.eat('}', true);
/** @type {AST.ExpressionTag} */
const expression = {
type: 'ExpressionTag',
start: value_start,
end: value_start + name.length,
expression: {
start: value_start,
end: value_start + name.length,
type: 'Identifier',
name
},
parent: null,
metadata: {
expression: create_expression_metadata()
}
};
return create_attribute(name, start, parser.index, expression);
}
}
const name = parser.read_until(regex_token_ending_character);
if (!name) return null;
let end = parser.index;
parser.allow_whitespace();
const colon_index = name.indexOf(':');
const type = colon_index !== -1 && get_directive_type(name.slice(0, colon_index));
/** @type {true | AST.ExpressionTag | Array<AST.Text | AST.ExpressionTag>} */
let value = true;
if (parser.eat('=')) {
parser.allow_whitespace();
value = read_attribute_value(parser);
end = parser.index;
} else if (parser.match_regex(regex_starts_with_quote_characters)) {
e.expected_token(parser.index, '=');
}
if (type) {
const [directive_name, ...modifiers] = name.slice(colon_index + 1).split('|');
if (directive_name === '') {
e.directive_missing_name({ start, end: start + colon_index + 1 }, name);
}
if (type === 'StyleDirective') {
return {
start,
end,
type,
name: directive_name,
modifiers: /** @type {Array<'important'>} */ (modifiers),
value,
parent: null,
metadata: {
expression: create_expression_metadata()
}
};
}
const first_value = value === true ? undefined : Array.isArray(value) ? value[0] : value;
/** @type {Expression | null} */
let expression = null;
if (first_value) {
const attribute_contains_text =
/** @type {any[]} */ (value).length > 1 || first_value.type === 'Text';
if (attribute_contains_text) {
e.directive_invalid_value(/** @type {number} */ (first_value.start));
} else {
// TODO throw a parser error in a future version here if this `[ExpressionTag]` instead of `ExpressionTag`,
// which means stringified value, which isn't allowed for some directives?
expression = first_value.expression;
}
}
/** @type {Directive} */
// @ts-expect-error TODO can't figure out this error
const directive = {
start,
end,
type,
name: directive_name,
modifiers,
expression,
metadata: {
expression: create_expression_metadata()
}
};
if (directive.type === 'TransitionDirective') {
const direction = name.slice(0, colon_index);
directive.intro = direction === 'in' || direction === 'transition';
directive.outro = direction === 'out' || direction === 'transition';
}
// Directive name is expression, e.g. <p class:isRed />
if (
(directive.type === 'BindDirective' || directive.type === 'ClassDirective') &&
!directive.expression
) {
directive.expression = /** @type {any} */ ({
start: start + colon_index + 1,
end,
type: 'Identifier',
name: directive.name
});
}
return directive;
}
return create_attribute(name, start, end, value);
}
/**
* @param {string} name
* @returns {any}
*/
function get_directive_type(name) {
if (name === 'use') return 'UseDirective';
if (name === 'animate') return 'AnimateDirective';
if (name === 'bind') return 'BindDirective';
if (name === 'class') return 'ClassDirective';
if (name === 'style') return 'StyleDirective';
if (name === 'on') return 'OnDirective';
if (name === 'let') return 'LetDirective';
if (name === 'in' || name === 'out' || name === 'transition') return 'TransitionDirective';
return false;
}
/**
* @param {Parser} parser
* @return {AST.ExpressionTag | Array<AST.ExpressionTag | AST.Text>}
*/
function read_attribute_value(parser) {
const quote_mark = parser.eat("'") ? "'" : parser.eat('"') ? '"' : null;
if (quote_mark && parser.eat(quote_mark)) {
return [
{
start: parser.index - 1,
end: parser.index - 1,
type: 'Text',
raw: '',
data: '',
parent: null
}
];
}
/** @type {Array<AST.ExpressionTag | AST.Text>} */
let value;
try {
value = read_sequence(
parser,
() => {
// handle common case of quote marks existing outside of regex for performance reasons
if (quote_mark) return parser.match(quote_mark);
return !!parser.match_regex(regex_invalid_unquoted_attribute_value);
},
'in attribute value'
);
} catch (/** @type {any} */ error) {
if (error.code === 'js_parse_error') {
// if the attribute value didn't close + self-closing tag
// eg: `<Component test={{a:1} />`
// acorn may throw a `Unterminated regular expression` because of `/>`
const pos = error.position?.[0];
if (pos !== undefined && parser.template.slice(pos - 1, pos + 1) === '/>') {
parser.index = pos;
e.expected_token(pos, quote_mark || '}');
}
}
throw error;
}
if (value.length === 0 && !quote_mark) {
e.expected_attribute_value(parser.index);
}
if (quote_mark) parser.index += 1;
if (quote_mark || value.length > 1 || value[0].type === 'Text') {
return value;
} else {
return value[0];
}
}
/**
* @param {Parser} parser
* @param {() => boolean} done
* @param {string} location
* @returns {any[]}
*/
function read_sequence(parser, done, location) {
/** @type {AST.Text} */
let current_chunk = {
start: parser.index,
end: -1,
type: 'Text',
raw: '',
data: '',
parent: null
};
/** @type {Array<AST.Text | AST.ExpressionTag>} */
const chunks = [];
/** @param {number} end */
function flush(end) {
if (current_chunk.raw) {
current_chunk.data = decode_character_references(current_chunk.raw, true);
current_chunk.end = end;
chunks.push(current_chunk);
}
}
while (parser.index < parser.template.length) {
const index = parser.index;
if (done()) {
flush(parser.index);
return chunks;
} else if (parser.eat('{')) {
if (parser.match('#')) {
const index = parser.index - 1;
parser.eat('#');
const name = parser.read_until(/[^a-z]/);
e.block_invalid_placement(index, name, location);
} else if (parser.match('@')) {
const index = parser.index - 1;
parser.eat('@');
const name = parser.read_until(/[^a-z]/);
e.tag_invalid_placement(index, name, location);
}
flush(parser.index - 1);
parser.allow_whitespace();
const expression = read_expression(parser);
parser.allow_whitespace();
parser.eat('}', true);
/** @type {AST.ExpressionTag} */
const chunk = {
type: 'ExpressionTag',
start: index,
end: parser.index,
expression,
parent: null,
metadata: {
expression: create_expression_metadata()
}
};
chunks.push(chunk);
current_chunk = {
start: parser.index,
end: -1,
type: 'Text',
raw: '',
data: '',
parent: null
};
} else {
current_chunk.raw += parser.template[parser.index++];
}
}
e.unexpected_eof(parser.template.length);
}
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