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/** @import { AST } from '#compiler' */
/** @import { SourceLocation } from '#shared' */
/** @import { ComponentClientTransformState, ComponentContext } from '../types' */
/** @import { Scope } from '../../../scope' */
import {
is_boolean_attribute,
is_dom_property,
is_load_error_element,
is_void
} from '../../../../../utils.js';
import { escape_html } from '../../../../../escaping.js';
import { dev, is_ignored, 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 { is_custom_element_node } from '../../../nodes.js';
import { clean_nodes, determine_namespace_for_children } from '../../utils.js';
import { build_getter, can_inline_variable } from '../utils.js';
import {
get_attribute_name,
build_attribute_value,
build_class_directives,
build_style_directives
} from './shared/element.js';
import { process_children } from './shared/fragment.js';
import {
build_render_statement,
build_template_literal,
build_update,
build_update_assignment,
get_states_and_calls
} from './shared/utils.js';
import { visit_event_attribute } from './shared/events.js';
/**
* @param {AST.RegularElement} node
* @param {ComponentContext} context
*/
export function RegularElement(node, context) {
/** @type {SourceLocation} */
let location = [-1, -1];
if (dev) {
const loc = locator(node.start);
if (loc) {
location[0] = loc.line;
location[1] = loc.column;
context.state.locations.push(location);
}
}
if (node.name === 'noscript') {
context.state.template.push('<noscript></noscript>');
return;
}
if (node.name === 'script') {
context.state.metadata.context.template_contains_script_tag = true;
}
const metadata = context.state.metadata;
const child_metadata = {
...context.state.metadata,
namespace: determine_namespace_for_children(node, context.state.metadata.namespace)
};
context.state.template.push(`<${node.name}`);
/** @type {Array<AST.Attribute | AST.SpreadAttribute>} */
const attributes = [];
/** @type {AST.ClassDirective[]} */
const class_directives = [];
/** @type {AST.StyleDirective[]} */
const style_directives = [];
/** @type {ExpressionStatement[]} */
const lets = [];
const is_custom_element = is_custom_element_node(node);
let needs_input_reset = false;
let needs_content_reset = false;
/** @type {AST.BindDirective | null} */
let value_binding = null;
/** If true, needs `__value` for inputs */
let needs_special_value_handling = node.name === 'option' || node.name === 'select';
let is_content_editable = false;
let has_content_editable_binding = false;
let img_might_be_lazy = false;
let might_need_event_replaying = false;
let has_direction_attribute = false;
let has_style_attribute = false;
if (is_custom_element) {
// cloneNode is faster, but it does not instantiate the underlying class of the
// custom element until the template is connected to the dom, which would
// cause problems when setting properties on the custom element.
// Therefore we need to use importNode instead, which doesn't have this caveat.
metadata.context.template_needs_import_node = true;
}
// visit let directives first, to set state
for (const attribute of node.attributes) {
if (attribute.type === 'LetDirective') {
lets.push(/** @type {ExpressionStatement} */ (context.visit(attribute)));
}
}
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
attributes.push(attribute);
if (node.name === 'img' && attribute.name === 'loading') {
img_might_be_lazy = true;
}
if (attribute.name === 'dir') {
has_direction_attribute = true;
}
if (attribute.name === 'style') {
has_style_attribute = true;
}
if (
(attribute.name === 'value' || attribute.name === 'checked') &&
!is_text_attribute(attribute)
) {
needs_input_reset = true;
needs_content_reset = true;
} else if (
attribute.name === 'contenteditable' &&
(attribute.value === true ||
(is_text_attribute(attribute) && attribute.value[0].data === 'true'))
) {
is_content_editable = true;
}
} else if (attribute.type === 'SpreadAttribute') {
attributes.push(attribute);
needs_input_reset = true;
needs_content_reset = true;
if (is_load_error_element(node.name)) {
might_need_event_replaying = true;
}
} else if (attribute.type === 'ClassDirective') {
class_directives.push(attribute);
} else if (attribute.type === 'StyleDirective') {
style_directives.push(attribute);
} else if (attribute.type === 'OnDirective') {
const handler = /** @type {Expression} */ (context.visit(attribute));
const has_action_directive = node.attributes.find((a) => a.type === 'UseDirective');
context.state.after_update.push(
b.stmt(has_action_directive ? b.call('$.effect', b.thunk(handler)) : handler)
);
} else if (attribute.type !== 'LetDirective') {
if (attribute.type === 'BindDirective') {
if (attribute.name === 'group' || attribute.name === 'checked') {
needs_special_value_handling = true;
needs_input_reset = true;
} else if (attribute.name === 'value') {
value_binding = attribute;
needs_content_reset = true;
needs_input_reset = true;
} else if (
attribute.name === 'innerHTML' ||
attribute.name === 'innerText' ||
attribute.name === 'textContent'
) {
has_content_editable_binding = true;
}
} else if (attribute.type === 'UseDirective' && is_load_error_element(node.name)) {
might_need_event_replaying = true;
}
context.visit(attribute);
}
}
if (is_content_editable && has_content_editable_binding) {
child_metadata.bound_contenteditable = true;
}
if (needs_input_reset && node.name === 'input') {
context.state.init.push(b.stmt(b.call('$.remove_input_defaults', context.state.node)));
}
if (needs_content_reset && node.name === 'textarea') {
context.state.init.push(b.stmt(b.call('$.remove_textarea_child', context.state.node)));
}
if (value_binding !== null && node.name === 'select') {
setup_select_synchronization(value_binding, context);
}
const node_id = context.state.node;
// Let bindings first, they can be used on attributes
context.state.init.push(...lets);
// Then do attributes
let is_attributes_reactive = false;
if (node.metadata.has_spread) {
if (node.name === 'img') {
img_might_be_lazy = true;
}
build_element_spread_attributes(
attributes,
context,
node,
node_id,
// If value binding exists, that one takes care of calling $.init_select
value_binding === null && node.name === 'select'
);
is_attributes_reactive = true;
} else {
for (const attribute of /** @type {AST.Attribute[]} */ (attributes)) {
if (is_event_attribute(attribute)) {
if (
(attribute.name === 'onload' || attribute.name === 'onerror') &&
is_load_error_element(node.name)
) {
might_need_event_replaying = true;
}
visit_event_attribute(attribute, context);
continue;
}
if (needs_special_value_handling && attribute.name === 'value') {
build_element_special_value_attribute(node.name, node_id, attribute, context);
continue;
}
if (
!is_custom_element &&
attribute.name !== 'autofocus' &&
(attribute.value === true || is_text_attribute(attribute))
) {
const name = get_attribute_name(node, attribute, context);
const value = is_text_attribute(attribute) ? attribute.value[0].data : true;
if (name !== 'class' || value) {
context.state.template.push(
` ${attribute.name}${
is_boolean_attribute(name) && value === true
? ''
: `="${value === true ? '' : escape_html(value, true)}"`
}`
);
}
continue;
}
const is = is_custom_element
? build_custom_element_attribute_update_assignment(node_id, attribute, context)
: build_element_attribute_update_assignment(node, node_id, attribute, context);
if (is) is_attributes_reactive = true;
}
}
// Apply the src and loading attributes for <img> elements after the element is appended to the document
if (img_might_be_lazy) {
context.state.after_update.push(b.stmt(b.call('$.handle_lazy_img', node_id)));
}
// class/style directives must be applied last since they could override class/style attributes
build_class_directives(class_directives, node_id, context, is_attributes_reactive);
build_style_directives(
style_directives,
node_id,
context,
is_attributes_reactive,
has_style_attribute || node.metadata.has_spread
);
if (might_need_event_replaying) {
context.state.after_update.push(b.stmt(b.call('$.replay_events', node_id)));
}
context.state.template.push('>');
/** @type {SourceLocation[]} */
const child_locations = [];
/** @type {ComponentClientTransformState} */
const state = {
...context.state,
metadata: child_metadata,
locations: child_locations,
scope: /** @type {Scope} */ (context.state.scopes.get(node.fragment)),
preserve_whitespace:
context.state.preserve_whitespace || node.name === 'pre' || node.name === 'textarea'
};
const { hoisted, trimmed } = clean_nodes(
node,
node.fragment.nodes,
context.path,
child_metadata.namespace,
state,
node.name === 'script' || state.preserve_whitespace,
state.options.preserveComments
);
/** Whether or not we need to wrap the children in `{...}` to avoid declaration conflicts */
const has_declaration = node.fragment.nodes.some((node) => node.type === 'SnippetBlock');
/** @type {typeof state} */
const child_state = { ...state, init: [], update: [], after_update: [] };
for (const node of hoisted) {
context.visit(node, child_state);
}
// special case — if an element that only contains text, we don't need
// to descend into it if the text is non-reactive
const states_and_calls =
trimmed.every((node) => node.type === 'Text' || node.type === 'ExpressionTag') &&
trimmed.some((node) => node.type === 'ExpressionTag') &&
get_states_and_calls(trimmed);
if (states_and_calls && states_and_calls.states === 0) {
child_state.init.push(
b.stmt(
b.assignment(
'=',
b.member(context.state.node, 'textContent'),
build_template_literal(trimmed, context.visit, child_state).value
)
)
);
} else {
/** @type {Expression} */
let arg = context.state.node;
// If `hydrate_node` is set inside the element, we need to reset it
// after the element has been hydrated
let needs_reset = trimmed.some((node) => node.type !== 'Text');
// The same applies if it's a `<template>` element, since we need to
// set the value of `hydrate_node` to `node.content`
if (node.name === 'template') {
needs_reset = true;
child_state.init.push(b.stmt(b.call('$.hydrate_template', arg)));
arg = b.member(arg, 'content');
}
process_children(trimmed, () => b.call('$.child', arg), true, {
...context,
state: child_state
});
if (needs_reset) {
child_state.init.push(b.stmt(b.call('$.reset', context.state.node)));
}
}
if (has_declaration) {
context.state.init.push(
b.block([
...child_state.init,
child_state.update.length > 0 ? build_render_statement(child_state.update) : b.empty,
...child_state.after_update
])
);
} else if (node.fragment.metadata.dynamic) {
context.state.init.push(...child_state.init);
context.state.update.push(...child_state.update);
context.state.after_update.push(...child_state.after_update);
}
if (has_direction_attribute) {
// This fixes an issue with Chromium where updates to text content within an element
// does not update the direction when set to auto. If we just re-assign the dir, this fixes it.
const dir = b.member(node_id, 'dir');
context.state.update.push(b.stmt(b.assignment('=', dir, dir)));
}
if (child_locations.length > 0) {
// @ts-expect-error
location.push(child_locations);
}
if (!is_void(node.name)) {
context.state.template.push(`</${node.name}>`);
}
}
/**
* Special case: if we have a value binding on a select element, we need to set up synchronization
* between the value binding and inner signals, for indirect updates
* @param {AST.BindDirective} value_binding
* @param {ComponentContext} context
*/
function setup_select_synchronization(value_binding, context) {
if (context.state.analysis.runes) return;
let bound = value_binding.expression;
while (bound.type === 'MemberExpression') {
bound = /** @type {Identifier | MemberExpression} */ (bound.object);
}
/** @type {string[]} */
const names = [];
for (const [name, refs] of context.state.scope.references) {
if (
refs.length > 0 &&
// prevent infinite loop
name !== bound.name
) {
names.push(name);
}
}
const invalidator = b.call(
'$.invalidate_inner_signals',
b.thunk(
b.block(
names.map((name) => {
const serialized = build_getter(b.id(name), context.state);
return b.stmt(serialized);
})
)
)
);
context.state.init.push(
b.stmt(
b.call(
'$.template_effect',
b.thunk(
b.block([
b.stmt(/** @type {Expression} */ (context.visit(value_binding.expression))),
b.stmt(invalidator)
])
)
)
)
);
}
/**
* @param {Array<AST.Attribute | AST.SpreadAttribute>} attributes
* @param {ComponentContext} context
* @param {AST.RegularElement} element
* @param {Identifier} element_id
* @param {boolean} needs_select_handling
*/
function build_element_spread_attributes(
attributes,
context,
element,
element_id,
needs_select_handling
) {
let needs_isolation = false;
/** @type {ObjectExpression['properties']} */
const values = [];
for (const attribute of attributes) {
if (attribute.type === 'Attribute') {
const name = get_attribute_name(element, attribute, context);
// TODO: handle has_call
const { value } = build_attribute_value(attribute.value, context);
if (
name === 'is' &&
value.type === 'Literal' &&
context.state.metadata.namespace === 'html'
) {
context.state.template.push(` is="${escape_html(value.value, true)}"`);
continue;
}
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(name, value));
}
} else {
values.push(b.spread(/** @type {Expression} */ (context.visit(attribute))));
}
needs_isolation ||=
attribute.type === 'SpreadAttribute' && attribute.metadata.expression.has_call;
}
const preserve_attribute_case =
element.metadata.svg || element.metadata.mathml || is_custom_element_node(element);
const id = b.id(context.state.scope.generate('attributes'));
const update = b.stmt(
b.assignment(
'=',
id,
b.call(
'$.set_attributes',
element_id,
id,
b.object(values),
context.state.analysis.css.hash !== '' && b.literal(context.state.analysis.css.hash),
preserve_attribute_case && b.true,
is_ignored(element, 'hydration_attribute_changed') && b.true
)
)
);
context.state.init.push(b.let(id));
// objects could contain reactive getters -> play it safe and always assume spread attributes are reactive
if (needs_isolation) {
context.state.init.push(build_update(update));
} else {
context.state.update.push(update);
}
if (needs_select_handling) {
context.state.init.push(
b.stmt(b.call('$.init_select', element_id, b.thunk(b.member(id, 'value'))))
);
context.state.update.push(
b.if(
b.binary('in', b.literal('value'), id),
b.block([
// This ensures a one-way street to the DOM in case it's <select {value}>
// and not <select bind:value>. We need it in addition to $.init_select
// because the select value is not reflected as an attribute, so the
// mutation observer wouldn't notice.
b.stmt(b.call('$.select_option', element_id, b.member(id, 'value')))
])
)
);
}
}
/**
* Serializes an assignment to an element property by adding relevant statements to either only
* the init or the the init and update arrays, depending on whether or not the value is dynamic.
* Resulting code for static looks something like this:
* ```js
* element.property = value;
* // or
* $.set_attribute(element, property, value);
* });
* ```
* Resulting code for dynamic looks something like this:
* ```js
* let value;
* $.template_effect(() => {
* if (value !== (value = 'new value')) {
* element.property = value;
* // or
* $.set_attribute(element, property, value);
* }
* });
* ```
* Returns true if attribute is deemed reactive, false otherwise.
* @param {AST.RegularElement} element
* @param {Identifier} node_id
* @param {AST.Attribute} attribute
* @param {ComponentContext} context
* @returns {boolean}
*/
function build_element_attribute_update_assignment(element, node_id, attribute, context) {
const state = context.state;
const name = get_attribute_name(element, attribute, context);
const is_svg = context.state.metadata.namespace === 'svg' || element.name === 'svg';
const is_mathml = context.state.metadata.namespace === 'mathml';
let { has_call, value } = build_attribute_value(attribute.value, context);
if (name === 'autofocus') {
state.init.push(b.stmt(b.call('$.autofocus', node_id, value)));
return false;
}
/** @type {Statement} */
let update;
if (name === 'class') {
update = b.stmt(
b.call(
is_svg ? '$.set_svg_class' : is_mathml ? '$.set_mathml_class' : '$.set_class',
node_id,
value
)
);
} else if (name === 'value') {
update = b.stmt(b.call('$.set_value', node_id, value));
} else if (name === 'checked') {
update = b.stmt(b.call('$.set_checked', node_id, value));
} else if (is_dom_property(name)) {
update = b.stmt(b.assignment('=', b.member(node_id, name), value));
} else {
const callee = name.startsWith('xlink') ? '$.set_xlink_attribute' : '$.set_attribute';
update = b.stmt(
b.call(
callee,
node_id,
b.literal(name),
value,
is_ignored(element, 'hydration_attribute_changed') && b.true
)
);
}
const inlinable_expression =
attribute.value === true
? false // not an expression
: is_inlinable_expression(
Array.isArray(attribute.value) ? attribute.value : [attribute.value],
context.state
);
if (attribute.metadata.expression.has_state) {
if (has_call) {
state.init.push(build_update(update));
} else {
state.update.push(update);
}
return true;
} else {
if (inlinable_expression) {
context.state.template.push(` ${name}="`, value, '"');
} else {
state.init.push(update);
}
return false;
}
}
/**
* @param {(AST.Text | AST.ExpressionTag)[]} nodes
* @param {import('../types.js').ComponentClientTransformState} state
*/
function is_inlinable_expression(nodes, state) {
let has_expression_tag = false;
for (let value of nodes) {
if (value.type === 'ExpressionTag') {
if (value.expression.type === 'Identifier') {
const binding = state.scope
.owner(value.expression.name)
?.declarations.get(value.expression.name);
if (!can_inline_variable(binding)) {
return false;
}
} else {
return false;
}
has_expression_tag = true;
}
}
return has_expression_tag;
}
/**
* Like `build_element_attribute_update_assignment` but without any special attribute treatment.
* @param {Identifier} node_id
* @param {AST.Attribute} attribute
* @param {ComponentContext} context
* @returns {boolean}
*/
function build_custom_element_attribute_update_assignment(node_id, attribute, context) {
const state = context.state;
const name = attribute.name; // don't lowercase, as we set the element's property, which might be case sensitive
let { has_call, value } = build_attribute_value(attribute.value, context);
const update = b.stmt(b.call('$.set_custom_element_data', node_id, b.literal(name), value));
if (attribute.metadata.expression.has_state) {
if (has_call) {
state.init.push(build_update(update));
} else {
state.update.push(update);
}
return true;
} else {
state.init.push(update);
return false;
}
}
/**
* Serializes an assignment to the value property of a `<select>`, `<option>` or `<input>` element
* that needs the hidden `__value` property.
* Returns true if attribute is deemed reactive, false otherwise.
* @param {string} element
* @param {Identifier} node_id
* @param {AST.Attribute} attribute
* @param {ComponentContext} context
* @returns {boolean}
*/
function build_element_special_value_attribute(element, node_id, attribute, context) {
const state = context.state;
const { value } = build_attribute_value(attribute.value, context);
const inner_assignment = b.assignment(
'=',
b.member(node_id, 'value'),
b.conditional(
b.binary('==', b.literal(null), b.assignment('=', b.member(node_id, '__value'), value)),
b.literal(''), // render null/undefined values as empty string to support placeholder options
value
)
);
const is_select_with_value =
// attribute.metadata.dynamic would give false negatives because even if the value does not change,
// the inner options could still change, so we need to always treat it as reactive
element === 'select' && attribute.value !== true && !is_text_attribute(attribute);
const update = b.stmt(
is_select_with_value
? b.sequence([
inner_assignment,
// This ensures a one-way street to the DOM in case it's <select {value}>
// and not <select bind:value>. We need it in addition to $.init_select
// because the select value is not reflected as an attribute, so the
// mutation observer wouldn't notice.
b.call('$.select_option', node_id, value)
])
: inner_assignment
);
if (is_select_with_value) {
state.init.push(b.stmt(b.call('$.init_select', node_id, b.thunk(value))));
}
if (attribute.metadata.expression.has_state) {
const id = state.scope.generate(`${node_id.name}_value`);
build_update_assignment(
state,
id,
// `<option>` is a special case: The value property reflects to the DOM. If the value is set to undefined,
// that means the value should be set to the empty string. To be able to do that when the value is
// initially undefined, we need to set a value that is guaranteed to be different.
element === 'option' ? b.object([]) : undefined,
value,
update
);
return true;
} else {
state.init.push(update);
return false;
}
}
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