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/** The scope of constructs within the Svelte template */
export default class TemplateScope {
/**
* @typedef {import('../EachBlock').default
* | import('../ThenBlock').default
* | import('../CatchBlock').default
* | import('../InlineComponent').default
* | import('../Element').default
* | import('../SlotTemplate').default
* | import('../ConstTag').default} NodeWithScope
*/
/** @type {Set<string>} */
names;
/** @type {Map<string, Set<string>>} */
dependencies_for_name;
/** @type {Map<string, NodeWithScope>} */
owners = new Map();
/** @type {TemplateScope} */
parent;
/** @param {TemplateScope} [parent] undefined */
constructor(parent) {
this.parent = parent;
this.names = new Set(parent ? parent.names : []);
this.dependencies_for_name = new Map(parent ? parent.dependencies_for_name : []);
}
/**
* @param {any} name
* @param {Set<string>} dependencies
* @param {any} owner
*/
add(name, dependencies, owner) {
this.names.add(name);
this.dependencies_for_name.set(name, dependencies);
this.owners.set(name, owner);
return this;
}
child() {
const child = new TemplateScope(this);
return child;
}
/** @param {string} name */
is_top_level(name) {
return !this.parent || (!this.names.has(name) && this.parent.is_top_level(name));
}
/**
* @param {string} name
* @returns {NodeWithScope}
*/
get_owner(name) {
return this.owners.get(name) || (this.parent && this.parent.get_owner(name));
}
/** @param {string} name */
is_let(name) {
const owner = this.get_owner(name);
return (
owner &&
(owner.type === 'Element' ||
owner.type === 'InlineComponent' ||
owner.type === 'SlotTemplate')
);
}
/** @param {string} name */
is_await(name) {
const owner = this.get_owner(name);
return owner && (owner.type === 'ThenBlock' || owner.type === 'CatchBlock');
}
/** @param {string} name */
is_const(name) {
const owner = this.get_owner(name);
return owner && owner.type === 'ConstTag';
}
}
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