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/** @import { Context } from '../../types' */
import * as e from '../../../../errors.js';
import { get_attribute_expression, is_expression_attribute } from '../../../../utils/ast.js';
import { determine_slot } from '../../../../utils/slot.js';
import {
validate_attribute,
validate_attribute_name,
validate_slot_attribute
} from './attribute.js';
import { mark_subtree_dynamic } from './fragment.js';
/**
* @param {AST.Component | AST.SvelteComponent | AST.SvelteSelf} node
* @param {Context} context
*/
export function visit_component(node, context) {
mark_subtree_dynamic(context.path);
for (const attribute of node.attributes) {
if (
attribute.type !== 'Attribute' &&
attribute.type !== 'SpreadAttribute' &&
attribute.type !== 'LetDirective' &&
attribute.type !== 'OnDirective' &&
attribute.type !== 'BindDirective'
) {
e.component_invalid_directive(attribute);
}
if (
attribute.type === 'OnDirective' &&
(attribute.modifiers.length > 1 || attribute.modifiers.some((m) => m !== 'once'))
) {
e.event_handler_invalid_component_modifier(attribute);
}
if (attribute.type === 'Attribute') {
if (context.state.analysis.runes) {
validate_attribute(attribute, node);
if (is_expression_attribute(attribute)) {
const expression = get_attribute_expression(attribute);
if (expression.type === 'SequenceExpression') {
let i = /** @type {number} */ (expression.start);
while (--i > 0) {
const char = context.state.analysis.source[i];
if (char === '(') break; // parenthesized sequence expressions are ok
if (char === '{') e.attribute_invalid_sequence_expression(expression);
}
}
}
}
validate_attribute_name(attribute);
if (attribute.name === 'slot') {
validate_slot_attribute(context, attribute, true);
}
}
if (attribute.type === 'BindDirective' && attribute.name !== 'this') {
context.state.analysis.uses_component_bindings = true;
}
}
// If the component has a slot attribute — `<Foo slot="whatever" .../>` —
// then `let:` directives apply to other attributes, instead of just the
// top-level contents of the component. Yes, this is very weird.
const default_state = determine_slot(node)
? context.state
: { ...context.state, scope: node.metadata.scopes.default };
for (const attribute of node.attributes) {
context.visit(attribute, attribute.type === 'LetDirective' ? default_state : context.state);
}
/** @type {AST.Comment[]} */
let comments = [];
/** @type {Record<string, AST.Fragment['nodes']>} */
const nodes = { default: [] };
for (const child of node.fragment.nodes) {
if (child.type === 'Comment') {
comments.push(child);
continue;
}
const slot_name = determine_slot(child) ?? 'default';
(nodes[slot_name] ??= []).push(...comments, child);
if (slot_name !== 'default') comments = [];
}
const component_slots = new Set();
for (const slot_name in nodes) {
const state = {
...context.state,
scope: node.metadata.scopes[slot_name],
parent_element: null,
component_slots
};
context.visit({ ...node.fragment, nodes: nodes[slot_name] }, state);
}
}
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