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/** @import { Attribute, ClassDirective, Namespace, RegularElement, SpreadAttribute, StyleDirective, SvelteElement, SvelteNode } from '#compiler' */
/** @import { ComponentContext, ComponentServerTransformState } from '../../types.js' */
import {
get_attribute_chunks,
is_event_attribute,
is_text_attribute
} from '../../../../../utils/ast.js';
import { binding_properties } from '../../../../bindings.js';
import {
ContentEditableBindings,
LoadErrorElements,
WhitespaceInsensitiveAttributes
} from '../../../../constants.js';
import { create_attribute, is_custom_element_node } from '../../../../nodes.js';
import { regex_starts_with_newline } from '../../../../patterns.js';
import * as b from '../../../../../utils/builders.js';
import {
DOMBooleanAttributes,
ELEMENT_IS_NAMESPACED,
ELEMENT_PRESERVE_ATTRIBUTE_CASE
} from '../../../../../../constants.js';
import { serialize_attribute_value } from './utils.js';
/**
* Writes the output to the template output. Some elements may have attributes on them that require the
* their output to be the child content instead. In this case, an object is returned.
* @param {RegularElement | SvelteElement} node
* @param {import('zimmerframe').Context<SvelteNode, ComponentServerTransformState>} context
*/
export function serialize_element_attributes(node, context) {
/** @type {Array<Attribute | SpreadAttribute>} */
const attributes = [];
/** @type {ClassDirective[]} */
const class_directives = [];
/** @type {StyleDirective[]} */
const style_directives = [];
/** @type {ExpressionStatement[]} */
const lets = [];
/** @type {Expression | null} */
let content = null;
let has_spread = false;
// Use the index to keep the attributes order which is important for spreading
let class_index = -1;
let style_index = -1;
let events_to_capture = new Set();
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
if (attribute.name === 'value') {
if (node.name === 'textarea') {
if (
attribute.value !== true &&
Array.isArray(attribute.value) &&
attribute.value[0].type === 'Text' &&
regex_starts_with_newline.test(attribute.value[0].data)
) {
// Two or more leading newlines are required to restore the leading newline immediately after `<textarea>`.
// see https://html.spec.whatwg.org/multipage/syntax.html#element-restrictions
// also see related code in analysis phase
attribute.value[0].data = '\n' + attribute.value[0].data;
}
content = b.call('$.escape', serialize_attribute_value(attribute.value, context));
} else if (node.name !== 'select') {
// omit value attribute for select elements, it's irrelevant for the initially selected value and has no
// effect on the selected value after the user interacts with the select element (the value _property_ does, but not the attribute)
attributes.push(attribute);
}
// omit event handlers except for special cases
} else if (is_event_attribute(attribute)) {
if (
(attribute.name === 'onload' || attribute.name === 'onerror') &&
LoadErrorElements.includes(node.name)
) {
events_to_capture.add(attribute.name);
}
} else {
if (attribute.name === 'class') {
class_index = attributes.length;
} else if (attribute.name === 'style') {
style_index = attributes.length;
}
attributes.push(attribute);
}
} else if (attribute.type === 'BindDirective') {
if (attribute.name === 'value' && node.name === 'select') continue;
if (
attribute.name === 'value' &&
attributes.some(
(attr) =>
attr.type === 'Attribute' &&
attr.name === 'type' &&
is_text_attribute(attr) &&
attr.value[0].data === 'file'
)
) {
continue;
}
if (attribute.name === 'this') continue;
const binding = binding_properties[attribute.name];
if (binding?.omit_in_ssr) continue;
if (ContentEditableBindings.includes(attribute.name)) {
content = /** @type {Expression} */ (context.visit(attribute.expression));
} else if (attribute.name === 'value' && node.name === 'textarea') {
content = b.call(
'$.escape',
/** @type {Expression} */ (context.visit(attribute.expression))
);
} else if (attribute.name === 'group') {
const value_attribute = /** @type {Attribute | undefined} */ (
node.attributes.find((attr) => attr.type === 'Attribute' && attr.name === 'value')
);
if (!value_attribute) continue;
const is_checkbox = node.attributes.some(
(attr) =>
attr.type === 'Attribute' &&
attr.name === 'type' &&
is_text_attribute(attr) &&
attr.value[0].data === 'checkbox'
);
attributes.push(
create_attribute('checked', -1, -1, [
{
type: 'ExpressionTag',
start: -1,
end: -1,
parent: attribute,
expression: is_checkbox
? b.call(
b.member(attribute.expression, b.id('includes')),
serialize_attribute_value(value_attribute.value, context)
)
: b.binary(
'===',
attribute.expression,
serialize_attribute_value(value_attribute.value, context)
),
metadata: {
contains_call_expression: false,
dynamic: false
}
}
])
);
} else {
attributes.push(
create_attribute(attribute.name, -1, -1, [
{
type: 'ExpressionTag',
start: -1,
end: -1,
parent: attribute,
expression: attribute.expression,
metadata: {
contains_call_expression: false,
dynamic: false
}
}
])
);
}
} else if (attribute.type === 'SpreadAttribute') {
attributes.push(attribute);
has_spread = true;
if (LoadErrorElements.includes(node.name)) {
events_to_capture.add('onload');
events_to_capture.add('onerror');
}
} else if (attribute.type === 'UseDirective') {
if (LoadErrorElements.includes(node.name)) {
events_to_capture.add('onload');
events_to_capture.add('onerror');
}
} 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 {
context.visit(attribute);
}
}
if (class_directives.length > 0 && !has_spread) {
const class_attribute = serialize_class_directives(
class_directives,
/** @type {Attribute | null} */ (attributes[class_index] ?? null)
);
if (class_index === -1) {
attributes.push(class_attribute);
}
}
if (style_directives.length > 0 && !has_spread) {
serialize_style_directives(
style_directives,
/** @type {Attribute | null} */ (attributes[style_index] ?? null),
context
);
if (style_index > -1) {
attributes.splice(style_index, 1);
}
}
// Let bindings first, they can be used on attributes
context.state.init.push(...lets);
if (has_spread) {
serialize_element_spread_attributes(
node,
attributes,
style_directives,
class_directives,
context
);
} else {
for (const attribute of /** @type {Attribute[]} */ (attributes)) {
if (attribute.value === true || is_text_attribute(attribute)) {
const name = get_attribute_name(node, attribute, context);
const literal_value = /** @type {Literal} */ (
serialize_attribute_value(
attribute.value,
context,
WhitespaceInsensitiveAttributes.includes(name)
)
).value;
if (name !== 'class' || literal_value) {
context.state.template.push(
b.literal(
` ${attribute.name}${
DOMBooleanAttributes.includes(name) && literal_value === true
? ''
: `="${literal_value === true ? '' : String(literal_value)}"`
}`
)
);
}
continue;
}
const name = get_attribute_name(node, attribute, context);
const is_boolean = DOMBooleanAttributes.includes(name);
const value = serialize_attribute_value(
attribute.value,
context,
WhitespaceInsensitiveAttributes.includes(name)
);
context.state.template.push(
b.call('$.attr', b.literal(name), value, is_boolean && b.literal(is_boolean))
);
}
}
if (events_to_capture.size !== 0) {
for (const event of events_to_capture) {
context.state.template.push(b.literal(` ${event}="this.__e=event"`));
}
}
return content;
}
/**
* @param {RegularElement | SvelteElement} element
* @param {Attribute} attribute
* @param {{ state: { namespace: Namespace }}} context
*/
function get_attribute_name(element, attribute, context) {
let name = attribute.name;
if (!element.metadata.svg && !element.metadata.mathml && context.state.namespace !== 'foreign') {
name = name.toLowerCase();
// don't lookup boolean aliases here, the server runtime function does only
// check for the lowercase variants of boolean attributes
}
return name;
}
/**
*
* @param {RegularElement | SvelteElement} element
* @param {Array<Attribute | SpreadAttribute>} attributes
* @param {StyleDirective[]} style_directives
* @param {ClassDirective[]} class_directives
* @param {ComponentContext} context
*/
function serialize_element_spread_attributes(
element,
attributes,
style_directives,
class_directives,
context
) {
let classes;
let styles;
let flags = 0;
if (class_directives.length > 0 || context.state.analysis.css.hash) {
const properties = class_directives.map((directive) =>
b.init(
directive.name,
directive.expression.type === 'Identifier' && directive.expression.name === directive.name
? b.id(directive.name)
: /** @type {Expression} */ (context.visit(directive.expression))
)
);
if (context.state.analysis.css.hash) {
properties.unshift(b.init(context.state.analysis.css.hash, b.literal(true)));
}
classes = b.object(properties);
}
if (style_directives.length > 0) {
const properties = style_directives.map((directive) =>
b.init(
directive.name,
directive.value === true
? b.id(directive.name)
: serialize_attribute_value(directive.value, context, true)
)
);
styles = b.object(properties);
}
if (element.metadata.svg || element.metadata.mathml) {
flags |= ELEMENT_IS_NAMESPACED | ELEMENT_PRESERVE_ATTRIBUTE_CASE;
} else if (is_custom_element_node(element)) {
flags |= ELEMENT_PRESERVE_ATTRIBUTE_CASE;
}
const object = b.object(
attributes.map((attribute) => {
if (attribute.type === 'Attribute') {
const name = get_attribute_name(element, attribute, context);
const value = serialize_attribute_value(
attribute.value,
context,
WhitespaceInsensitiveAttributes.includes(name)
);
return b.prop('init', b.key(name), value);
}
return b.spread(/** @type {Expression} */ (context.visit(attribute)));
})
);
const args = [object, classes, styles, flags ? b.literal(flags) : undefined];
context.state.template.push(b.call('$.spread_attributes', ...args));
}
/**
*
* @param {ClassDirective[]} class_directives
* @param {Attribute | null} class_attribute
* @returns
*/
function serialize_class_directives(class_directives, class_attribute) {
const expressions = class_directives.map((directive) =>
b.conditional(directive.expression, b.literal(directive.name), b.literal(''))
);
if (class_attribute === null) {
class_attribute = create_attribute('class', -1, -1, []);
}
const chunks = get_attribute_chunks(class_attribute.value);
const last = chunks.at(-1);
if (last?.type === 'Text') {
last.data += ' ';
last.raw += ' ';
} else if (last) {
chunks.push({
type: 'Text',
start: -1,
end: -1,
parent: class_attribute,
data: ' ',
raw: ' '
});
}
chunks.push({
type: 'ExpressionTag',
start: -1,
end: -1,
parent: class_attribute,
expression: b.call(
b.member(
b.call(b.member(b.array(expressions), b.id('filter')), b.id('Boolean')),
b.id('join')
),
b.literal(' ')
),
metadata: { contains_call_expression: false, dynamic: false }
});
class_attribute.value = chunks;
return class_attribute;
}
/**
* @param {StyleDirective[]} style_directives
* @param {Attribute | null} style_attribute
* @param {ComponentContext} context
*/
function serialize_style_directives(style_directives, style_attribute, context) {
const styles = style_directives.map((directive) => {
let value =
directive.value === true
? b.id(directive.name)
: serialize_attribute_value(directive.value, context, true);
if (directive.modifiers.includes('important')) {
value = b.binary('+', value, b.literal(' !important'));
}
return b.init(directive.name, value);
});
const arg =
style_attribute === null
? b.object(styles)
: b.call(
'$.merge_styles',
serialize_attribute_value(style_attribute.value, context, true),
b.object(styles)
);
context.state.template.push(b.call('$.add_styles', arg));
}
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