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/** @import { AST, Namespace } from '#compiler' */
/** @import { ComponentContext } from '../../types' */
import { normalize_attribute } from '../../../../../../utils.js';
import { is_ignored } from '../../../../../state.js';
import { get_attribute_expression, is_event_attribute } from '../../../../../utils/ast.js';
import * as b from '../../../../../utils/builders.js';
import { build_getter, create_derived } from '../../utils.js';
import { build_template_literal, build_update } from './utils.js';
/**
* @param {Array<AST.Attribute | AST.SpreadAttribute>} attributes
* @param {ComponentContext} context
* @param {AST.RegularElement | AST.SvelteElement} element
* @param {Identifier} element_id
* @param {Identifier} attributes_id
* @param {false | Expression} preserve_attribute_case
* @param {false | Expression} is_custom_element
*/
export function build_set_attributes(
attributes,
context,
element,
element_id,
attributes_id,
preserve_attribute_case,
is_custom_element
) {
let needs_isolation = false;
let has_state = 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) &&
(value.type === 'ArrowFunctionExpression' || value.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));
}
has_state ||= attribute.metadata.expression.has_state;
} else {
values.push(b.spread(/** @type {Expression} */ (context.visit(attribute))));
// objects could contain reactive getters -> play it safe and always assume spread attributes are reactive
has_state = true;
needs_isolation ||= attribute.metadata.expression.has_call;
}
}
const call = b.call(
'$.set_attributes',
element_id,
has_state ? attributes_id : b.literal(null),
b.object(values),
context.state.analysis.css.hash !== '' && b.literal(context.state.analysis.css.hash),
preserve_attribute_case,
is_custom_element,
is_ignored(element, 'hydration_attribute_changed') && b.true
);
if (has_state) {
context.state.init.push(b.let(attributes_id));
const update = b.stmt(b.assignment('=', attributes_id, call));
if (needs_isolation) {
context.state.init.push(build_update(update));
return false;
}
context.state.update.push(update);
return true;
}
context.state.init.push(b.stmt(call));
return false;
}
/**
* Serializes each style directive into something like `$.set_style(element, style_property, value)`
* and adds it either to init or update, depending on whether or not the value or the attributes are dynamic.
* @param {AST.StyleDirective[]} style_directives
* @param {Identifier} element_id
* @param {ComponentContext} context
* @param {boolean} is_attributes_reactive
* @param {boolean} force_check Should be `true` if we can't rely on our cached value, because for example there's also a `style` attribute
*/
export function build_style_directives(
style_directives,
element_id,
context,
is_attributes_reactive,
force_check
) {
const state = context.state;
for (const directive of style_directives) {
const { has_state, has_call } = directive.metadata.expression;
let value =
directive.value === true
? build_getter({ name: directive.name, type: 'Identifier' }, context.state)
: build_attribute_value(directive.value, context).value;
if (has_call) {
const id = b.id(state.scope.generate('style_directive'));
state.init.push(b.const(id, create_derived(state, b.thunk(value))));
value = b.call('$.get', id);
}
const update = b.stmt(
b.call(
'$.set_style',
element_id,
b.literal(directive.name),
value,
/** @type {Expression} */ (directive.modifiers.includes('important') ? b.true : undefined),
force_check ? b.true : undefined
)
);
if (!is_attributes_reactive && has_call) {
state.init.push(build_update(update));
} else if (is_attributes_reactive || has_state || has_call) {
state.update.push(update);
} else {
state.init.push(update);
}
}
}
/**
* Serializes each class directive into something like `$.class_toogle(element, class_name, value)`
* and adds it either to init or update, depending on whether or not the value or the attributes are dynamic.
* @param {AST.ClassDirective[]} class_directives
* @param {Identifier} element_id
* @param {ComponentContext} context
* @param {boolean} is_attributes_reactive
*/
export function build_class_directives(
class_directives,
element_id,
context,
is_attributes_reactive
) {
const state = context.state;
for (const directive of class_directives) {
const { has_state, has_call } = directive.metadata.expression;
let value = /** @type {Expression} */ (context.visit(directive.expression));
if (has_call) {
const id = b.id(state.scope.generate('class_directive'));
state.init.push(b.const(id, create_derived(state, b.thunk(value))));
value = b.call('$.get', id);
}
const update = b.stmt(b.call('$.toggle_class', element_id, b.literal(directive.name), value));
if (!is_attributes_reactive && has_call) {
state.init.push(build_update(update));
} else if (is_attributes_reactive || has_state || has_call) {
state.update.push(update);
} else {
state.init.push(update);
}
}
}
/**
* @param {AST.Attribute['value']} value
* @param {ComponentContext} context
* @returns {{ value: Expression, has_state: boolean, has_call: boolean }}
*/
export function build_attribute_value(value, context) {
if (value === true) {
return { has_state: false, has_call: false, value: b.literal(true) };
}
if (!Array.isArray(value) || value.length === 1) {
const chunk = Array.isArray(value) ? value[0] : value;
if (chunk.type === 'Text') {
return { has_state: false, has_call: false, value: b.literal(chunk.data) };
}
return {
has_state: chunk.metadata.expression.has_state,
has_call: chunk.metadata.expression.has_call,
value: /** @type {Expression} */ (context.visit(chunk.expression))
};
}
return build_template_literal(value, context.visit, context.state);
}
/**
* @param {AST.RegularElement | AST.SvelteElement} element
* @param {AST.Attribute} attribute
*/
export function get_attribute_name(element, attribute) {
if (!element.metadata.svg && !element.metadata.mathml) {
return normalize_attribute(attribute.name);
}
return attribute.name;
}
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