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/** @import { AST } from '#compiler' */
/** @import { ComponentContext } from '../types' */
import { dev, locator } from '../../../../state.js';
import {
get_attribute_expression,
is_event_attribute,
is_text_attribute
} from '../../../../utils/ast.js';
import * as b from '../../../../utils/builders.js';
import { determine_namespace_for_children } from '../../utils.js';
import {
build_attribute_value,
build_class_directives,
build_style_directives
} from './shared/element.js';
import { build_render_statement, build_update } from './shared/utils.js';
/**
* @param {AST.SvelteElement} node
* @param {ComponentContext} context
*/
export function SvelteElement(node, context) {
context.state.template.push(`<!>`);
/** @type {Array<AST.Attribute | AST.SpreadAttribute>} */
const attributes = [];
/** @type {AST.Attribute['value'] | undefined} */
let dynamic_namespace = undefined;
/** @type {AST.ClassDirective[]} */
const class_directives = [];
/** @type {AST.StyleDirective[]} */
const style_directives = [];
/** @type {ExpressionStatement[]} */
const lets = [];
// Create a temporary context which picks up the init/update statements.
// They'll then be added to the function parameter of $.element
const element_id = b.id(context.state.scope.generate('$$element'));
/** @type {ComponentContext} */
const inner_context = {
...context,
state: {
...context.state,
node: element_id,
before_init: [],
init: [],
update: [],
after_update: []
}
};
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
if (attribute.name === 'xmlns' && !is_text_attribute(attribute)) {
dynamic_namespace = attribute.value;
}
attributes.push(attribute);
} else if (attribute.type === 'SpreadAttribute') {
attributes.push(attribute);
} else if (attribute.type === 'ClassDirective') {
class_directives.push(attribute);
} else if (attribute.type === 'StyleDirective') {
style_directives.push(attribute);
} else if (attribute.type === 'LetDirective') {
lets.push(/** @type {ExpressionStatement} */ (context.visit(attribute)));
} else if (attribute.type === 'OnDirective') {
const handler = /** @type {Expression} */ (context.visit(attribute, inner_context.state));
inner_context.state.after_update.push(b.stmt(handler));
} else {
context.visit(attribute, inner_context.state);
}
}
// Let bindings first, they can be used on attributes
context.state.init.push(...lets); // create computeds in the outer context; the dynamic element is the single child of this slot
// Then do attributes
// Always use spread because we don't know whether the element is a custom element or not,
// therefore we need to do the "how to set an attribute" logic at runtime.
const is_attributes_reactive =
build_dynamic_element_attributes(attributes, inner_context, element_id) !== null;
// class/style directives must be applied last since they could override class/style attributes
build_class_directives(class_directives, element_id, inner_context, is_attributes_reactive);
build_style_directives(style_directives, element_id, inner_context, is_attributes_reactive, true);
const get_tag = b.thunk(/** @type {Expression} */ (context.visit(node.tag)));
if (dev) {
if (node.fragment.nodes.length > 0) {
context.state.init.push(b.stmt(b.call('$.validate_void_dynamic_element', get_tag)));
}
context.state.init.push(b.stmt(b.call('$.validate_dynamic_element_tag', get_tag)));
}
/** @type {Statement[]} */
const inner = inner_context.state.init;
if (inner_context.state.update.length > 0) {
inner.push(build_render_statement(inner_context.state.update));
}
inner.push(...inner_context.state.after_update);
inner.push(
.../** @type {BlockStatement} */ (
context.visit(node.fragment, {
...context.state,
metadata: {
...context.state.metadata,
namespace: determine_namespace_for_children(node, context.state.metadata.namespace)
}
})
).body
);
const location = dev && locator(node.start);
context.state.init.push(
b.stmt(
b.call(
'$.element',
context.state.node,
get_tag,
node.metadata.svg || node.metadata.mathml ? b.true : b.false,
inner.length > 0 && b.arrow([element_id, b.id('$$anchor')], b.block(inner)),
dynamic_namespace && b.thunk(build_attribute_value(dynamic_namespace, context).value),
location && b.array([b.literal(location.line), b.literal(location.column)])
)
)
);
}
/**
* Serializes dynamic element attribute assignments.
* Returns the `true` if spread is deemed reactive.
* @param {Array<AST.Attribute | AST.SpreadAttribute>} attributes
* @param {ComponentContext} context
* @param {Identifier} element_id
* @returns {boolean}
*/
function build_dynamic_element_attributes(attributes, context, element_id) {
if (attributes.length === 0) {
if (context.state.analysis.css.hash) {
context.state.init.push(
b.stmt(b.call('$.set_class', element_id, b.literal(context.state.analysis.css.hash)))
);
}
return false;
}
// TODO why are we always treating this as a spread? needs docs, if that's not an error
let needs_isolation = false;
let is_reactive = false;
/** @type {ObjectExpression['properties']} */
const values = [];
for (const attribute of attributes) {
if (attribute.type === 'Attribute') {
const { value } = build_attribute_value(attribute.value, context);
if (
is_event_attribute(attribute) &&
(get_attribute_expression(attribute).type === 'ArrowFunctionExpression' ||
get_attribute_expression(attribute).type === 'FunctionExpression')
) {
// Give the event handler a stable ID so it isn't removed and readded on every update
const id = context.state.scope.generate('event_handler');
context.state.init.push(b.var(id, value));
values.push(b.init(attribute.name, b.id(id)));
} else {
values.push(b.init(attribute.name, value));
}
} else {
values.push(b.spread(/** @type {Expression} */ (context.visit(attribute))));
}
is_reactive ||=
attribute.metadata.expression.has_state ||
// objects could contain reactive getters -> play it safe and always assume spread attributes are reactive
attribute.type === 'SpreadAttribute';
needs_isolation ||=
attribute.type === 'SpreadAttribute' && attribute.metadata.expression.has_call;
}
if (needs_isolation || is_reactive) {
const id = context.state.scope.generate('attributes');
context.state.init.push(b.let(id));
const update = b.stmt(
b.assignment(
'=',
b.id(id),
b.call(
'$.set_dynamic_element_attributes',
element_id,
b.id(id),
b.object(values),
context.state.analysis.css.hash !== '' && b.literal(context.state.analysis.css.hash)
)
)
);
if (needs_isolation) {
context.state.init.push(build_update(update));
return false;
}
context.state.update.push(update);
return true;
}
context.state.init.push(
b.stmt(
b.call(
'$.set_dynamic_element_attributes',
element_id,
b.literal(null),
b.object(values),
context.state.analysis.css.hash !== '' && b.literal(context.state.analysis.css.hash)
)
)
);
return false;
}
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