Press n or j to go to the next uncovered block, b, p or k for the previous block.
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2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 147x 147x 147x 147x 147x 111x 147x 95x 90x 90x 67x 67x 90x 95x 147x 147x 147x 2298x 2298x 47x 47x 47x 47x 47x 47x 2298x 2298x 2298x 2298x 76x 76x 293x 1x 1x 76x 76x 76x 293x 1x 1x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 76x 2298x 2298x 2298x 2298x 2298x 2298x 86x 86x 86x 86x 86x 2298x 2298x 2298x 2298x 2298x 8076x 2079x 2079x 8076x 2298x 136x 136x 2298x 1116x 1116x 1116x 1116x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 10x 10x 10x 39x 39x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 10x 2298x 2298x 24x 24x 24x 24x 2298x 2298x 3x 3x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 2298x 96x 96x 96x 96x 96x 96x 96x 96x 96x 96x 96x 96x 96x 96x 96x 96x 96x 96x 96x 96x 2294x 2198x 2198x 2298x 2298x 96x 96x 96x 96x 96x 96x 96x 2298x 2298x 2298x 2298x 2298x 2298x 2298x 2x 2x 2x 2x 2x 2x 2x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x | import { walk } from 'zimmerframe';
import { set_scope, get_rune } from '../../scope.js';
import {
extract_identifiers,
extract_paths,
is_event_attribute,
is_expression_async,
unwrap_optional
} from '../../../utils/ast.js';
import * as b from '../../../utils/builders.js';
import is_reference from 'is-reference';
import {
ContentEditableBindings,
LoadErrorElements,
VoidElements,
WhitespaceInsensitiveAttributes
} from '../../constants.js';
import {
clean_nodes,
determine_namespace_for_children,
infer_namespace,
transform_inspect_rune
} from '../utils.js';
import { create_attribute, is_custom_element_node, is_element_node } from '../../nodes.js';
import { binding_properties } from '../../bindings.js';
import { regex_starts_with_newline, regex_whitespaces_strict } from '../../patterns.js';
import {
DOMBooleanAttributes,
ELEMENT_IS_NAMESPACED,
ELEMENT_PRESERVE_ATTRIBUTE_CASE,
HYDRATION_END,
HYDRATION_START
} from '../../../../constants.js';
import { escape_html } from '../../../../escaping.js';
import { sanitize_template_string } from '../../../utils/sanitize_template_string.js';
import { BLOCK_CLOSE, BLOCK_CLOSE_ELSE } from '../../../../internal/server/hydration.js';
import { filename, locator } from '../../../state.js';
export const block_open = t_string(`<!--${HYDRATION_START}-->`);
export const block_close = t_string(`<!--${HYDRATION_END}-->`);
/**
* @param {string} value
* @returns {import('./types').TemplateString}
*/
function t_string(value) {
return { type: 'string', value };
}
/**
* @param {import('estree').Expression} value
* @param {boolean} [needs_escaping]
* @returns {import('./types').TemplateExpression}
*/
function t_expression(value, needs_escaping = false) {
return { type: 'expression', value, needs_escaping };
}
/**
* @param {import('estree').Statement} value
* @returns {import('./types').TemplateStatement}
*/
function t_statement(value) {
return { type: 'statement', value };
}
/**
* @param {import('./types').Template[]} template
* @param {import('estree').Identifier} out
* @returns {import('estree').Statement[]}
*/
function serialize_template(template, out = b.id('out')) {
/** @type {import('estree').TemplateElement[]} */
let quasis = [];
/** @type {import('estree').Expression[]} */
let expressions = [];
/** @type {import('estree').Statement[]} */
const statements = [];
const flush_payload = () => {
statements.push(
b.stmt(b.assignment('+=', b.member(b.id('$$payload'), out), b.template(quasis, expressions)))
);
quasis = [];
expressions = [];
};
for (let i = 0; i < template.length; i++) {
const template_item = template[i];
if (template_item.type === 'statement') {
if (quasis.length !== 0) {
flush_payload();
}
statements.push(template_item.value);
} else {
let last = quasis.at(-1);
if (!last) quasis.push((last = b.quasi('', false)));
if (template_item.type === 'string') {
last.value.raw += sanitize_template_string(template_item.value);
} else if (template_item.type === 'expression') {
const value = template_item.value;
if (value.type === 'TemplateLiteral') {
const raw = value.quasis[0].value.raw;
last.value.raw += template_item.needs_escaping ? sanitize_template_string(raw) : raw;
quasis.push(...value.quasis.slice(1));
expressions.push(...value.expressions);
continue;
}
expressions.push(value);
quasis.push(b.quasi('', i + 1 === template.length || template[i + 1].type === 'statement'));
}
}
}
if (quasis.length !== 0) {
flush_payload();
}
return statements;
}
/**
* Processes an array of template nodes, joining sibling text/expression nodes and
* recursing into child nodes.
* @param {Array<import('#compiler').SvelteNode | import('./types').Anchor>} nodes
* @param {import('#compiler').SvelteNode} parent
* @param {import('./types').ComponentContext} context
*/
function process_children(nodes, parent, { visit, state }) {
/** @typedef {Array<import('#compiler').Text | import('#compiler').Comment | import('#compiler').ExpressionTag | import('./types').Anchor>} Sequence */
/** @type {Sequence} */
let sequence = [];
let did_flush = false;
/**
* @param {Sequence} sequence
* @param {boolean} final
*/
function flush_sequence(sequence, final) {
const is_single_flush = !did_flush && final;
did_flush = true;
if (sequence.length === 1) {
const node = sequence[0];
if (node.type === 'Text') {
if (
is_single_flush &&
parent.type === 'RegularElement' &&
(parent.name === 'script' || parent.name === 'style')
) {
state.template.push(t_string(node.data));
} else {
state.template.push(t_string(escape_html(node.data)));
}
return;
}
if (node.type === 'Comment') {
state.template.push(t_string(`<!--${escape_html(node.data)}-->`));
return;
}
if (node.type === 'Anchor') {
state.template.push(t_expression(node.id));
return;
}
const expression = b.call(
'$.escape',
/** @type {import('estree').Expression} */ (visit(node.expression))
);
state.template.push(t_expression(expression));
return;
}
/** @type {import('estree').TemplateElement[]} */
const quasis = [];
/** @type {import('estree').Expression[]} */
const expressions = [];
quasis.push(b.quasi('', false));
for (let i = 0; i < sequence.length; i++) {
const node = sequence[i];
if (node.type === 'Text' || node.type === 'Comment') {
let last = /** @type {import('estree').TemplateElement} */ (quasis.at(-1));
last.value.raw += node.type === 'Comment' ? `<!--${node.data}-->` : escape_html(node.data);
} else if (node.type === 'ExpressionTag' && node.expression.type === 'Literal') {
let last = /** @type {import('estree').TemplateElement} */ (quasis.at(-1));
if (node.expression.value != null) {
last.value.raw += escape_html(node.expression.value + '');
}
} else if (node.type === 'Anchor') {
expressions.push(node.id);
quasis.push(b.quasi('', i + 1 === sequence.length));
} else {
expressions.push(
b.call('$.escape', /** @type {import('estree').Expression} */ (visit(node.expression)))
);
quasis.push(b.quasi('', i + 1 === sequence.length));
}
}
state.template.push(t_expression(b.template(quasis, expressions), true));
}
for (let i = 0; i < nodes.length; i += 1) {
const node = nodes[i];
if (
node.type === 'Text' ||
node.type === 'Comment' ||
node.type === 'ExpressionTag' ||
node.type === 'Anchor'
) {
sequence.push(node);
} else {
if (sequence.length > 0) {
flush_sequence(sequence, false);
sequence = [];
}
visit(node, {
...state
});
}
}
if (sequence.length > 0) {
flush_sequence(sequence, true);
}
}
/**
* @param {import('#compiler').SvelteNode} parent
* @param {import('#compiler').SvelteNode[]} nodes
* @param {import('./types').ComponentContext} context
* @param {import('./types').Anchor} [anchor]
* @returns {import('estree').Statement[]}
*/
function create_block(parent, nodes, context, anchor) {
const namespace = infer_namespace(context.state.metadata.namespace, parent, nodes, context.path);
const { hoisted, trimmed } = clean_nodes(
parent,
nodes,
context.path,
namespace,
context.state.preserve_whitespace,
context.state.options.preserveComments
);
if (hoisted.length === 0 && trimmed.length === 0 && !anchor) {
return [];
}
/** @type {import('./types').ComponentServerTransformState} */
const state = {
...context.state,
init: [],
template: [],
metadata: {
namespace
}
};
for (const node of hoisted) {
context.visit(node, state);
}
process_children(anchor ? [anchor, ...trimmed, anchor] : trimmed, parent, {
...context,
state
});
/** @type {import('estree').Statement[]} */
const body = [];
if (state.template.length > 0) {
body.push(...state.init);
body.push(...serialize_template(state.template));
} else {
body.push(...state.init);
}
return body;
}
/**
* @param {import('estree').VariableDeclarator} declarator
* @param {import('../../scope').Scope} scope
* @param {import('estree').Expression} value
* @returns {import('estree').VariableDeclarator[]}
*/
function create_state_declarators(declarator, scope, value) {
if (declarator.id.type === 'Identifier') {
return [b.declarator(declarator.id, value)];
}
const tmp = scope.generate('tmp');
const paths = extract_paths(declarator.id);
return [
b.declarator(b.id(tmp), value), // TODO inject declarator for opts, so we can use it below
...paths.map((path) => {
const value = path.expression?.(b.id(tmp));
return b.declarator(path.node, value);
})
];
}
/**
* @param {import('estree').Identifier} node
* @param {import('./types').ServerTransformState} state
* @returns {import('estree').Expression}
*/
function serialize_get_binding(node, state) {
const binding = state.scope.get(node.name);
if (binding === null || node === binding.node) {
// No associated binding or the declaration itself which shouldn't be transformed
return node;
}
if (binding.kind === 'store_sub') {
const store_id = b.id(node.name.slice(1));
return b.call(
'$.store_get',
b.assignment('??=', b.id('$$store_subs'), b.object([])),
b.literal(node.name),
serialize_get_binding(store_id, state)
);
}
if (binding.expression) {
return typeof binding.expression === 'function' ? binding.expression(node) : binding.expression;
}
return node;
}
/**
* @param {import('estree').AssignmentExpression} node
* @param {Pick<import('zimmerframe').Context<import('#compiler').SvelteNode, import('./types').ServerTransformState>, 'visit' | 'state'>} context
*/
function get_assignment_value(node, { state, visit }) {
if (node.left.type === 'Identifier') {
const operator = node.operator;
return operator === '='
? /** @type {import('estree').Expression} */ (visit(node.right))
: // turn something like x += 1 into x = x + 1
b.binary(
/** @type {import('estree').BinaryOperator} */ (operator.slice(0, -1)),
serialize_get_binding(node.left, state),
/** @type {import('estree').Expression} */ (visit(node.right))
);
} else {
return /** @type {import('estree').Expression} */ (visit(node.right));
}
}
/**
* @param {string} name
*/
function is_store_name(name) {
return name[0] === '$' && /[A-Za-z_]/.test(name[1]);
}
/**
* @param {import('estree').AssignmentExpression} node
* @param {import('zimmerframe').Context<import('#compiler').SvelteNode, import('./types').ServerTransformState>} context
* @param {() => any} fallback
* @returns {import('estree').Expression}
*/
function serialize_set_binding(node, context, fallback) {
const { state, visit } = context;
if (
node.left.type === 'ArrayPattern' ||
node.left.type === 'ObjectPattern' ||
node.left.type === 'RestElement'
) {
// Turn assignment into an IIFE, so that `$.set` calls etc don't produce invalid code
const tmp_id = context.state.scope.generate('tmp');
/** @type {import('estree').AssignmentExpression[]} */
const original_assignments = [];
/** @type {import('estree').Expression[]} */
const assignments = [];
const paths = extract_paths(node.left);
for (const path of paths) {
const value = path.expression?.(b.id(tmp_id));
const assignment = b.assignment('=', path.node, value);
original_assignments.push(assignment);
assignments.push(serialize_set_binding(assignment, context, () => assignment));
}
if (assignments.every((assignment, i) => assignment === original_assignments[i])) {
// No change to output -> nothing to transform -> we can keep the original assignment
return fallback();
}
return b.call(
b.thunk(
b.block([
b.const(tmp_id, /** @type {import('estree').Expression} */ (visit(node.right))),
b.stmt(b.sequence(assignments)),
b.return(b.id(tmp_id))
])
)
);
}
if (node.left.type !== 'Identifier' && node.left.type !== 'MemberExpression') {
throw new Error(`Unexpected assignment type ${node.left.type}`);
}
let left = node.left;
while (left.type === 'MemberExpression') {
// @ts-expect-error
left = left.object;
}
if (left.type !== 'Identifier') {
return fallback();
}
const is_store = is_store_name(left.name);
const left_name = is_store ? left.name.slice(1) : left.name;
const binding = state.scope.get(left_name);
if (!binding) return fallback();
if (binding.mutation !== null) {
return binding.mutation(node, context);
}
if (
binding.kind !== 'state' &&
binding.kind !== 'frozen_state' &&
binding.kind !== 'prop' &&
binding.kind !== 'bindable_prop' &&
binding.kind !== 'each' &&
binding.kind !== 'legacy_reactive' &&
!is_store
) {
// TODO error if it's a computed (or rest prop)? or does that already happen elsewhere?
return fallback();
}
const value = get_assignment_value(node, { state, visit });
if (left === node.left) {
if (is_store) {
return b.call(
'$.store_set',
b.id(left_name),
/** @type {import('estree').Expression} */ (visit(node.right))
);
}
return fallback();
} else if (is_store) {
return b.call(
'$.mutate_store',
b.assignment('??=', b.id('$$store_subs'), b.object([])),
b.literal(left.name),
b.id(left_name),
b.assignment(node.operator, /** @type {import('estree').Pattern} */ (visit(node.left)), value)
);
}
return fallback();
}
/**
* @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} element
* @param {import('#compiler').Attribute} attribute
* @param {{ state: { metadata: { namespace: import('#compiler').Namespace }}}} context
*/
function get_attribute_name(element, attribute, context) {
let name = attribute.name;
if (
!element.metadata.svg &&
!element.metadata.mathml &&
context.state.metadata.namespace !== 'foreign'
) {
name = name.toLowerCase();
// don't lookup boolean aliases here, the server runtime function does only
// check for the lowercase variants of boolean attributes
}
return name;
}
/** @type {import('./types').Visitors} */
const global_visitors = {
Identifier(node, { path, state }) {
if (is_reference(node, /** @type {import('estree').Node} */ (path.at(-1)))) {
if (node.name === '$$props') {
return b.id('$$sanitized_props');
}
return serialize_get_binding(node, state);
}
},
AssignmentExpression(node, context) {
return serialize_set_binding(node, context, context.next);
},
UpdateExpression(node, context) {
const { state, next } = context;
const argument = node.argument;
if (argument.type === 'Identifier' && state.scope.get(argument.name)?.kind === 'store_sub') {
let fn = '$.update_store';
if (node.prefix) fn += '_pre';
/** @type {import('estree').Expression[]} */
const args = [
b.assignment('??=', b.id('$$store_subs'), b.object([])),
b.literal(argument.name),
b.id(argument.name.slice(1))
];
if (node.operator === '--') {
args.push(b.literal(-1));
}
return b.call(fn, ...args);
}
return next();
}
};
/** @type {import('./types').Visitors} */
const javascript_visitors = {
Program(node, { visit }) {
return /** @type {import('estree').Program} */ ({
...node,
body: node.body.map((node) => /** @type {import('estree').Node} */ (visit(node)))
});
},
BlockStatement(node, { visit }) {
return /** @type {import('estree').BlockStatement} */ ({
...node,
body: node.body.map((node) => /** @type {import('estree').Node} */ (visit(node)))
});
}
};
/** @type {import('./types').Visitors} */
const javascript_visitors_runes = {
ClassBody(node, { state, visit }) {
/** @type {Map<string, import('../../3-transform/client/types.js').StateField>} */
const public_derived = new Map();
/** @type {Map<string, import('../../3-transform/client/types.js').StateField>} */
const private_derived = new Map();
/** @type {string[]} */
const private_ids = [];
for (const definition of node.body) {
if (
definition.type === 'PropertyDefinition' &&
(definition.key.type === 'Identifier' || definition.key.type === 'PrivateIdentifier')
) {
const { type, name } = definition.key;
const is_private = type === 'PrivateIdentifier';
if (is_private) private_ids.push(name);
if (definition.value?.type === 'CallExpression') {
const rune = get_rune(definition.value, state.scope);
if (rune === '$derived' || rune === '$derived.by') {
/** @type {import('../../3-transform/client/types.js').StateField} */
const field = {
kind: rune === '$derived.by' ? 'derived_call' : 'derived',
// @ts-expect-error this is set in the next pass
id: is_private ? definition.key : null
};
if (is_private) {
private_derived.set(name, field);
} else {
public_derived.set(name, field);
}
}
}
}
}
// each `foo = $derived()` needs a backing `#foo` field
for (const [name, field] of public_derived) {
let deconflicted = name;
while (private_ids.includes(deconflicted)) {
deconflicted = '_' + deconflicted;
}
private_ids.push(deconflicted);
field.id = b.private_id(deconflicted);
}
/** @type {Array<import('estree').MethodDefinition | import('estree').PropertyDefinition>} */
const body = [];
const child_state = { ...state, private_derived };
// Replace parts of the class body
for (const definition of node.body) {
if (
definition.type === 'PropertyDefinition' &&
(definition.key.type === 'Identifier' || definition.key.type === 'PrivateIdentifier')
) {
const name = definition.key.name;
const is_private = definition.key.type === 'PrivateIdentifier';
const field = (is_private ? private_derived : public_derived).get(name);
if (definition.value?.type === 'CallExpression' && field !== undefined) {
const init = /** @type {import('estree').Expression} **/ (
visit(definition.value.arguments[0], child_state)
);
const value =
field.kind === 'derived_call'
? b.call('$.once', init)
: b.call('$.once', b.thunk(init));
if (is_private) {
body.push(b.prop_def(field.id, value));
} else {
// #foo;
const member = b.member(b.this, field.id);
body.push(b.prop_def(field.id, value));
// get foo() { return this.#foo; }
body.push(b.method('get', definition.key, [], [b.return(b.call(member))]));
if ((field.kind === 'derived' || field.kind === 'derived_call') && state.options.dev) {
body.push(
b.method(
'set',
definition.key,
[b.id('_')],
[b.throw_error(`Cannot update a derived property ('${name}')`)]
)
);
}
}
continue;
}
}
body.push(/** @type {import('estree').MethodDefinition} **/ (visit(definition, child_state)));
}
return { ...node, body };
},
PropertyDefinition(node, { state, next, visit }) {
if (node.value != null && node.value.type === 'CallExpression') {
const rune = get_rune(node.value, state.scope);
if (rune === '$state' || rune === '$state.frozen' || rune === '$derived') {
return {
...node,
value:
node.value.arguments.length === 0
? null
: /** @type {import('estree').Expression} */ (visit(node.value.arguments[0]))
};
}
if (rune === '$derived.by') {
return {
...node,
value:
node.value.arguments.length === 0
? null
: b.call(/** @type {import('estree').Expression} */ (visit(node.value.arguments[0])))
};
}
}
next();
},
VariableDeclaration(node, { state, visit }) {
const declarations = [];
for (const declarator of node.declarations) {
const init = declarator.init;
const rune = get_rune(init, state.scope);
if (!rune || rune === '$effect.active' || rune === '$inspect') {
declarations.push(/** @type {import('estree').VariableDeclarator} */ (visit(declarator)));
continue;
}
if (rune === '$props') {
// remove $bindable() from props declaration
const id = walk(declarator.id, null, {
AssignmentPattern(node) {
if (
node.right.type === 'CallExpression' &&
get_rune(node.right, state.scope) === '$bindable'
) {
const right = node.right.arguments.length
? /** @type {import('estree').Expression} */ (visit(node.right.arguments[0]))
: b.id('undefined');
return b.assignment_pattern(node.left, right);
}
}
});
declarations.push(b.declarator(id, b.id('$$props')));
continue;
}
const args = /** @type {import('estree').CallExpression} */ (init).arguments;
const value =
args.length === 0
? b.id('undefined')
: /** @type {import('estree').Expression} */ (visit(args[0]));
if (rune === '$derived.by') {
declarations.push(
b.declarator(
/** @type {import('estree').Pattern} */ (visit(declarator.id)),
b.call(value)
)
);
continue;
}
if (declarator.id.type === 'Identifier') {
declarations.push(b.declarator(declarator.id, value));
continue;
}
if (rune === '$derived') {
declarations.push(
b.declarator(/** @type {import('estree').Pattern} */ (visit(declarator.id)), value)
);
continue;
}
declarations.push(...create_state_declarators(declarator, state.scope, value));
}
return {
...node,
declarations
};
},
ExpressionStatement(node, context) {
const expression = node.expression;
if (expression.type === 'CallExpression') {
const callee = expression.callee;
if (callee.type === 'Identifier' && callee.name === '$effect') {
return b.empty;
}
if (
callee.type === 'MemberExpression' &&
callee.object.type === 'Identifier' &&
callee.object.name === '$effect'
) {
return b.empty;
}
}
context.next();
},
CallExpression(node, context) {
const rune = get_rune(node, context.state.scope);
if (rune === '$host') {
return b.id('undefined');
}
if (rune === '$effect.active') {
return b.literal(false);
}
if (rune === '$state.snapshot') {
return /** @type {import('estree').Expression} */ (context.visit(node.arguments[0]));
}
if (rune === '$state.is') {
return b.call(
'Object.is',
/** @type {import('estree').Expression} */ (context.visit(node.arguments[0]))
);
}
if (rune === '$inspect' || rune === '$inspect().with') {
return transform_inspect_rune(node, context);
}
context.next();
},
MemberExpression(node, context) {
if (node.object.type === 'ThisExpression' && node.property.type === 'PrivateIdentifier') {
const field = context.state.private_derived.get(node.property.name);
if (field) {
return b.call(node);
}
}
context.next();
}
};
/**
*
* @param {true | Array<import('#compiler').Text | import('#compiler').ExpressionTag>} attribute_value
* @param {import('./types').ComponentContext} context
* @param {boolean} trim_whitespace
* @param {boolean} is_component
* @returns {import('estree').Expression}
*/
function serialize_attribute_value(
attribute_value,
context,
trim_whitespace = false,
is_component = false
) {
if (attribute_value === true) {
return b.true;
}
if (attribute_value.length === 0) {
return b.literal(''); // is this even possible?
}
if (attribute_value.length === 1) {
const value = attribute_value[0];
if (value.type === 'Text') {
let data = value.data;
if (trim_whitespace) {
data = data.replace(regex_whitespaces_strict, ' ').trim();
}
return b.literal(is_component ? data : escape_html(data, true));
} else {
return /** @type {import('estree').Expression} */ (context.visit(value.expression));
}
}
/** @type {import('estree').TemplateElement[]} */
const quasis = [];
/** @type {import('estree').Expression[]} */
const expressions = [];
quasis.push(b.quasi('', false));
let i = 0;
for (const node of attribute_value) {
i++;
if (node.type === 'Text') {
let data = node.data;
if (trim_whitespace) {
// don't trim, space could be important to separate from expression tag
data = data.replace(regex_whitespaces_strict, ' ');
}
const last = /** @type {import('estree').TemplateElement} */ (quasis.at(-1));
last.value.raw += data;
} else {
expressions.push(
b.call(
'$.stringify',
/** @type {import('estree').Expression} */ (context.visit(node.expression))
)
);
quasis.push(b.quasi('', i + 1 === attribute_value.length));
}
}
return b.template(quasis, expressions);
}
/**
*
* @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} element
* @param {Array<import('#compiler').Attribute | import('#compiler').SpreadAttribute>} attributes
* @param {import('#compiler').StyleDirective[]} style_directives
* @param {import('#compiler').ClassDirective[]} class_directives
* @param {import('./types').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 {import('estree').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 {import('estree').Expression} */ (context.visit(attribute)));
})
);
const args = [object, classes, styles, flags ? b.literal(flags) : undefined];
context.state.template.push(t_expression(b.call('$.spread_attributes', ...args)));
}
/**
* @param {import('#compiler').Component | import('#compiler').SvelteComponent | import('#compiler').SvelteSelf} node
* @param {string | import('estree').Expression} component_name
* @param {import('./types').ComponentContext} context
* @returns {import('estree').Statement}
*/
function serialize_inline_component(node, component_name, context) {
/** @type {Array<import('estree').Property[] | import('estree').Expression>} */
const props_and_spreads = [];
/** @type {import('estree').Property[]} */
const custom_css_props = [];
/** @type {import('estree').ExpressionStatement[]} */
const lets = [];
/** @type {Record<string, import('#compiler').TemplateNode[]>} */
const children = {};
/**
* If this component has a slot property, it is a named slot within another component. In this case
* the slot scope applies to the component itself, too, and not just its children.
*/
let slot_scope_applies_to_itself = false;
/**
* Components may have a children prop and also have child nodes. In this case, we assume
* that the child component isn't using render tags yet and pass the slot as $$slots.default.
* We're not doing it for spread attributes, as this would result in too many false positives.
*/
let has_children_prop = false;
/**
* @param {import('estree').Property} prop
*/
function push_prop(prop) {
const current = props_and_spreads.at(-1);
const current_is_props = Array.isArray(current);
const props = current_is_props ? current : [];
props.push(prop);
if (!current_is_props) {
props_and_spreads.push(props);
}
}
for (const attribute of node.attributes) {
if (attribute.type === 'LetDirective') {
lets.push(/** @type {import('estree').ExpressionStatement} */ (context.visit(attribute)));
} else if (attribute.type === 'SpreadAttribute') {
props_and_spreads.push(/** @type {import('estree').Expression} */ (context.visit(attribute)));
} else if (attribute.type === 'Attribute') {
if (attribute.name.startsWith('--')) {
const value = serialize_attribute_value(attribute.value, context, false, true);
custom_css_props.push(b.init(attribute.name, value));
continue;
}
if (attribute.name === 'slot') {
slot_scope_applies_to_itself = true;
}
if (attribute.name === 'children') {
has_children_prop = true;
}
const value = serialize_attribute_value(attribute.value, context, false, true);
push_prop(b.prop('init', b.key(attribute.name), value));
} else if (attribute.type === 'BindDirective' && attribute.name !== 'this') {
// TODO this needs to turn the whole thing into a while loop because the binding could be mutated eagerly in the child
push_prop(
b.get(attribute.name, [
b.return(/** @type {import('estree').Expression} */ (context.visit(attribute.expression)))
])
);
push_prop(
b.set(attribute.name, [
b.stmt(
/** @type {import('estree').Expression} */ (
context.visit(b.assignment('=', attribute.expression, b.id('$$value')))
)
),
b.stmt(b.assignment('=', b.id('$$settled'), b.false))
])
);
}
}
if (slot_scope_applies_to_itself) {
context.state.init.push(...lets);
}
/** @type {import('estree').Statement[]} */
const snippet_declarations = [];
// Group children by slot
for (const child of node.fragment.nodes) {
if (child.type === 'SnippetBlock') {
// the SnippetBlock visitor adds a declaration to `init`, but if it's directly
// inside a component then we want to hoist them into a block so that they
// can be used as props without creating conflicts
context.visit(child, {
...context.state,
init: snippet_declarations
});
push_prop(b.prop('init', child.expression, child.expression));
continue;
}
let slot_name = 'default';
if (is_element_node(child)) {
const attribute = /** @type {import('#compiler').Attribute | undefined} */ (
child.attributes.find(
(attribute) => attribute.type === 'Attribute' && attribute.name === 'slot'
)
);
if (attribute !== undefined) {
slot_name = /** @type {import('#compiler').Text[]} */ (attribute.value)[0].data;
}
}
children[slot_name] = children[slot_name] || [];
children[slot_name].push(child);
}
// Serialize each slot
/** @type {import('estree').Property[]} */
const serialized_slots = [];
for (const slot_name of Object.keys(children)) {
const body = create_block(node, children[slot_name], context);
if (body.length === 0) continue;
const slot_fn = b.arrow(
[b.id('$$payload'), b.id('$$slotProps')],
b.block([...(slot_name === 'default' && !slot_scope_applies_to_itself ? lets : []), ...body])
);
if (slot_name === 'default' && !has_children_prop) {
push_prop(
b.prop(
'init',
b.id('children'),
context.state.options.dev ? b.call('$.add_snippet_symbol', slot_fn) : slot_fn
)
);
// We additionally add the default slot as a boolean, so that the slot render function on the other
// side knows it should get the content to render from $$props.children
serialized_slots.push(b.init('default', b.true));
} else {
const slot = b.prop('init', b.literal(slot_name), slot_fn);
serialized_slots.push(slot);
}
}
if (serialized_slots.length > 0) {
push_prop(b.prop('init', b.id('$$slots'), b.object(serialized_slots)));
}
const props_expression =
props_and_spreads.length === 0 ||
(props_and_spreads.length === 1 && Array.isArray(props_and_spreads[0]))
? b.object(/** @type {import('estree').Property[]} */ (props_and_spreads[0] || []))
: b.call(
'$.spread_props',
b.array(props_and_spreads.map((p) => (Array.isArray(p) ? b.object(p) : p)))
);
/** @type {import('estree').Statement} */
let statement = b.stmt(
(typeof component_name === 'string' ? b.call : b.maybe_call)(
context.state.options.dev
? b.call(
'$.validate_component',
typeof component_name === 'string' ? b.id(component_name) : component_name
)
: component_name,
b.id('$$payload'),
props_expression
)
);
if (custom_css_props.length > 0) {
statement = b.stmt(
b.call(
'$.css_props',
b.id('$$payload'),
b.literal(context.state.metadata.namespace === 'svg' ? false : true),
b.object(custom_css_props),
b.thunk(b.block([statement]))
)
);
}
if (snippet_declarations.length > 0) {
statement = b.block([...snippet_declarations, statement]);
}
return statement;
}
/**
* Returns true if the attribute contains a single static text node.
* @param {import('#compiler').Attribute} attribute
* @returns {attribute is import('#compiler').Attribute & { value: [import('#compiler').Text] }}
*/
function is_text_attribute(attribute) {
return (
attribute.value !== true && attribute.value.length === 1 && attribute.value[0].type === 'Text'
);
}
/** @type {import('./types').Visitors} */
const javascript_visitors_legacy = {
VariableDeclaration(node, { state, visit }) {
/** @type {import('estree').VariableDeclarator[]} */
const declarations = [];
for (const declarator of node.declarations) {
const bindings = /** @type {import('#compiler').Binding[]} */ (
state.scope.get_bindings(declarator)
);
const has_state = bindings.some((binding) => binding.kind === 'state');
const has_props = bindings.some((binding) => binding.kind === 'bindable_prop');
if (!has_state && !has_props) {
declarations.push(/** @type {import('estree').VariableDeclarator} */ (visit(declarator)));
continue;
}
if (has_props) {
if (declarator.id.type !== 'Identifier') {
// Turn export let into props. It's really really weird because export let { x: foo, z: [bar]} = ..
// means that foo and bar are the props (i.e. the leafs are the prop names), not x and z.
const tmp = state.scope.generate('tmp');
const paths = extract_paths(declarator.id);
declarations.push(
b.declarator(
b.id(tmp),
/** @type {import('estree').Expression} */ (
visit(/** @type {import('estree').Expression} */ (declarator.init))
)
)
);
for (const path of paths) {
const value = path.expression?.(b.id(tmp));
const name = /** @type {import('estree').Identifier} */ (path.node).name;
const binding = /** @type {import('#compiler').Binding} */ (state.scope.get(name));
const prop = b.member(b.id('$$props'), b.literal(binding.prop_alias ?? name), true);
declarations.push(
b.declarator(path.node, b.call('$.value_or_fallback', prop, b.thunk(value)))
);
}
continue;
}
const binding = /** @type {import('#compiler').Binding} */ (
state.scope.get(declarator.id.name)
);
const prop = b.member(
b.id('$$props'),
b.literal(binding.prop_alias ?? declarator.id.name),
true
);
/** @type {import('estree').Expression} */
let init = prop;
if (declarator.init) {
const default_value = /** @type {import('estree').Expression} */ (visit(declarator.init));
init = is_expression_async(default_value)
? b.await(b.call('$.value_or_fallback_async', prop, b.thunk(default_value, true)))
: b.call('$.value_or_fallback', prop, b.thunk(default_value));
}
declarations.push(b.declarator(declarator.id, init));
continue;
}
declarations.push(
...create_state_declarators(
declarator,
state.scope,
/** @type {import('estree').Expression} */ (declarator.init && visit(declarator.init))
)
);
}
return {
...node,
declarations
};
},
LabeledStatement(node, context) {
if (context.path.length > 1) return;
if (node.label.name !== '$') return;
// TODO bail out if we're in module context
// these statements will be topologically ordered later
context.state.legacy_reactive_statements.set(
node,
// people could do "break $" inside, so we need to keep the label
b.labeled('$', /** @type {import('estree').ExpressionStatement} */ (context.visit(node.body)))
);
return b.empty;
}
};
/** @type {import('./types').ComponentVisitors} */
const template_visitors = {
Fragment(node, context) {
const body = create_block(node, node.nodes, context);
return b.block(body);
},
HtmlTag(node, context) {
const state = context.state;
state.template.push(block_open);
const raw = /** @type {import('estree').Expression} */ (context.visit(node.expression));
context.state.template.push(t_expression(raw));
state.template.push(block_close);
},
ConstTag(node, { state, visit }) {
const declaration = node.declaration.declarations[0];
const pattern = /** @type {import('estree').Pattern} */ (visit(declaration.id));
const init = /** @type {import('estree').Expression} */ (visit(declaration.init));
state.init.push(b.declaration('const', pattern, init));
},
DebugTag(node, { state, visit }) {
state.template.push(
t_statement(
b.stmt(
b.call(
'console.log',
b.object(
node.identifiers.map((identifier) =>
b.prop(
'init',
identifier,
/** @type {import('estree').Expression} */ (visit(identifier))
)
)
)
)
)
),
t_statement(b.debugger)
);
},
RenderTag(node, context) {
const state = context.state;
state.template.push(block_open);
const callee = unwrap_optional(node.expression).callee;
const raw_args = unwrap_optional(node.expression).arguments;
const expression = /** @type {import('estree').Expression} */ (context.visit(callee));
const snippet_function = state.options.dev
? b.call('$.validate_snippet', expression)
: expression;
const snippet_args = raw_args.map((arg) => {
return /** @type {import('estree').Expression} */ (context.visit(arg));
});
state.template.push(
t_statement(
b.stmt(
(node.expression.type === 'CallExpression' ? b.call : b.maybe_call)(
snippet_function,
b.id('$$payload'),
...snippet_args
)
)
)
);
state.template.push(block_close);
},
ClassDirective(node) {
throw new Error('Node should have been handled elsewhere');
},
StyleDirective(node) {
throw new Error('Node should have been handled elsewhere');
},
RegularElement(node, context) {
const metadata = {
...context.state.metadata,
namespace: determine_namespace_for_children(node, context.state.metadata.namespace)
};
context.state.template.push(t_string(`<${node.name}`));
const body_expression = serialize_element_attributes(node, context);
context.state.template.push(t_string('>'));
/** @type {import('./types').ComponentServerTransformState} */
const state = {
...context.state,
metadata,
preserve_whitespace:
context.state.preserve_whitespace ||
((node.name === 'pre' || node.name === 'textarea') && metadata.namespace !== 'foreign')
};
/** @type {import('./types').ComponentContext} */
const inner_context =
body_expression !== null
? {
...context,
state: {
...state,
template: [],
init: []
}
}
: { ...context, state };
const { hoisted, trimmed } = clean_nodes(
node,
node.fragment.nodes,
inner_context.path,
metadata.namespace,
state.preserve_whitespace,
state.options.preserveComments
);
for (const node of hoisted) {
inner_context.visit(node, state);
}
if (context.state.options.dev) {
const location = /** @type {import('locate-character').Location} */ (locator(node.start));
context.state.template.push(
t_statement(
b.stmt(
b.call(
'$.push_element',
b.id('$$payload'),
b.literal(node.name),
b.literal(location.line),
b.literal(location.column)
)
)
)
);
}
process_children(trimmed, node, inner_context);
if (body_expression !== null) {
let body_id;
const expression = body_expression.escape
? b.call('$.escape', body_expression.expression)
: body_expression.expression;
if (expression.type === 'Identifier') {
body_id = expression;
} else {
body_id = b.id(context.state.scope.generate('$$body'));
context.state.template.push(t_statement(b.const(body_id, expression)));
}
// Use the body expression as the body if it's truthy, otherwise use the inner template
context.state.template.push(
t_statement(
b.if(
body_id,
b.block(serialize_template([t_expression(body_id)])),
b.block([
...inner_context.state.init,
...serialize_template(inner_context.state.template)
])
)
)
);
}
if (!VoidElements.includes(node.name) && metadata.namespace !== 'foreign') {
context.state.template.push(t_string(`</${node.name}>`));
}
if (context.state.options.dev) {
context.state.template.push(t_statement(b.stmt(b.call('$.pop_element'))));
}
},
SvelteElement(node, context) {
let tag = /** @type {import('estree').Expression} */ (context.visit(node.tag));
if (tag.type !== 'Identifier') {
const tag_id = context.state.scope.generate('$$tag');
context.state.init.push(b.const(tag_id, tag));
tag = b.id(tag_id);
}
if (context.state.options.dev) {
if (node.fragment.nodes.length > 0) {
context.state.init.push(b.stmt(b.call('$.validate_void_dynamic_element', b.thunk(tag))));
}
context.state.init.push(b.stmt(b.call('$.validate_dynamic_element_tag', b.thunk(tag))));
}
const metadata = {
...context.state.metadata,
namespace: determine_namespace_for_children(node, context.state.metadata.namespace)
};
/** @type {import('./types').ComponentContext} */
const inner_context = {
...context,
state: {
...context.state,
metadata,
template: [],
init: []
}
};
context.state.template.push(block_open);
const main = create_block(node, node.fragment.nodes, {
...context,
state: { ...context.state, metadata }
});
serialize_element_attributes(node, inner_context);
if (context.state.options.dev) {
context.state.template.push(
t_statement(b.stmt(b.call('$.push_element', tag, b.id('$$payload'))))
);
}
context.state.template.push(
t_statement(
b.if(
tag,
b.stmt(
b.call(
'$.element',
b.id('$$payload'),
tag,
b.thunk(
b.block([
...inner_context.state.init,
...serialize_template(inner_context.state.template)
])
),
b.thunk(b.block(main))
)
)
)
),
block_close
);
if (context.state.options.dev) {
context.state.template.push(t_statement(b.stmt(b.call('$.pop_element'))));
}
},
EachBlock(node, context) {
const state = context.state;
state.template.push(block_open);
const each_node_meta = node.metadata;
const collection = /** @type {import('estree').Expression} */ (context.visit(node.expression));
const item = each_node_meta.item;
const index =
each_node_meta.contains_group_binding || !node.index
? each_node_meta.index
: b.id(node.index);
const children = node.body.nodes;
const array_id = state.scope.root.unique('each_array');
state.init.push(b.const(array_id, b.call('$.ensure_array_like', collection)));
/** @type {import('estree').Statement[]} */
const each = [b.const(item, b.member(array_id, index, true))];
if (node.context.type !== 'Identifier') {
each.push(b.const(/** @type {import('estree').Pattern} */ (node.context), item));
}
if (index.name !== node.index && node.index != null) {
each.push(b.let(node.index, index));
}
each.push(b.stmt(b.assignment('+=', b.id('$$payload.out'), b.literal(block_open.value))));
each.push(
.../** @type {import('estree').Statement[]} */ (create_block(node, children, context))
);
each.push(b.stmt(b.assignment('+=', b.id('$$payload.out'), b.literal(block_close.value))));
const for_loop = b.for(
b.let(index, b.literal(0)),
b.binary('<', index, b.member(array_id, b.id('length'))),
b.update('++', index, false),
b.block(each)
);
const close = b.stmt(b.assignment('+=', b.id('$$payload.out'), b.literal(BLOCK_CLOSE)));
if (node.fallback) {
const fallback = create_block(node, node.fallback.nodes, context);
fallback.push(b.stmt(b.assignment('+=', b.id('$$payload.out'), b.literal(BLOCK_CLOSE_ELSE))));
state.template.push(
t_statement(
b.if(
b.binary('!==', b.member(array_id, b.id('length')), b.literal(0)),
b.block([for_loop, close]),
b.block(fallback)
)
)
);
} else {
state.template.push(t_statement(for_loop), t_statement(close));
}
},
IfBlock(node, context) {
const state = context.state;
state.template.push(block_open);
const consequent = create_block(node, node.consequent.nodes, context);
const alternate = node.alternate ? create_block(node, node.alternate.nodes, context) : [];
consequent.push(b.stmt(b.assignment('+=', b.id('$$payload.out'), b.literal(BLOCK_CLOSE))));
alternate.push(b.stmt(b.assignment('+=', b.id('$$payload.out'), b.literal(BLOCK_CLOSE_ELSE))));
state.template.push(
t_statement(
b.if(
/** @type {import('estree').Expression} */ (context.visit(node.test)),
b.block(consequent),
b.block(alternate)
)
)
);
},
AwaitBlock(node, context) {
const state = context.state;
state.template.push(block_open);
state.template.push(
t_statement(
b.stmt(
b.call(
'$.await',
/** @type {import('estree').Expression} */ (context.visit(node.expression)),
b.thunk(
node.pending
? /** @type {import('estree').BlockStatement} */ (context.visit(node.pending))
: b.block([])
),
b.arrow(
node.value
? [/** @type {import('estree').Pattern} */ (context.visit(node.value))]
: [],
node.then
? /** @type {import('estree').BlockStatement} */ (context.visit(node.then))
: b.block([])
),
b.arrow(
node.error
? [/** @type {import('estree').Pattern} */ (context.visit(node.error))]
: [],
node.catch
? /** @type {import('estree').BlockStatement} */ (context.visit(node.catch))
: b.block([])
)
)
)
)
);
state.template.push(block_close);
},
KeyBlock(node, context) {
const state = context.state;
state.template.push(block_open);
const body = create_block(node, node.fragment.nodes, context);
state.template.push(t_statement(b.block(body)));
state.template.push(block_close);
},
SnippetBlock(node, context) {
const fn = b.function_declaration(
node.expression,
[b.id('$$payload'), ...node.parameters],
/** @type {import('estree').BlockStatement} */ (context.visit(node.body))
);
// @ts-expect-error - TODO remove this hack once $$render_inner for legacy bindings is gone
fn.___snippet = true;
// TODO hoist where possible
context.state.init.push(fn);
if (context.state.options.dev) {
context.state.init.push(b.stmt(b.call('$.add_snippet_symbol', node.expression)));
}
},
Component(node, context) {
const state = context.state;
state.template.push(block_open);
const call = serialize_inline_component(node, node.name, context);
state.template.push(t_statement(call));
state.template.push(block_close);
},
SvelteSelf(node, context) {
const state = context.state;
state.template.push(block_open);
const call = serialize_inline_component(node, context.state.analysis.name, context);
state.template.push(t_statement(call));
state.template.push(block_close);
},
SvelteComponent(node, context) {
const state = context.state;
state.template.push(block_open);
const call = serialize_inline_component(
node,
/** @type {import('estree').Expression} */ (context.visit(node.expression)),
context
);
state.template.push(t_statement(call));
state.template.push(block_close);
},
LetDirective(node, { state }) {
if (node.expression && node.expression.type !== 'Identifier') {
const name = state.scope.generate(node.name);
const bindings = state.scope.get_bindings(node);
for (const binding of bindings) {
binding.expression = b.member(b.id(name), b.id(binding.node.name));
}
return b.const(
name,
b.call(
b.thunk(
b.block([
b.let(
node.expression.type === 'ObjectExpression'
? // @ts-expect-error types don't match, but it can't contain spread elements and the structure is otherwise fine
b.object_pattern(node.expression.properties)
: // @ts-expect-error types don't match, but it can't contain spread elements and the structure is otherwise fine
b.array_pattern(node.expression.elements),
b.member(b.id('$$slotProps'), b.id(node.name))
),
b.return(b.object(bindings.map((binding) => b.init(binding.node.name, binding.node))))
])
)
)
);
} else {
const name = node.expression === null ? node.name : node.expression.name;
return b.const(name, b.member(b.id('$$slotProps'), b.id(node.name)));
}
},
SpreadAttribute(node, { visit }) {
return visit(node.expression);
},
SvelteFragment(node, context) {
for (const attribute of node.attributes) {
if (attribute.type === 'LetDirective') {
context.state.template.push(
t_statement(
/** @type {import('estree').ExpressionStatement} */ (context.visit(attribute))
)
);
}
}
const state = {
...context.state,
// TODO this logic eventually belongs in create_block, when fragments are used everywhere
scope: /** @type {import('../../scope').Scope} */ (context.state.scopes.get(node.fragment))
};
const body = create_block(node, node.fragment.nodes, {
...context,
state
});
context.state.template.push(t_statement(b.block(body)));
},
TitleElement(node, context) {
const state = context.state;
/** @type {import('./types').ComponentServerTransformState} */
const inner_state = {
...state,
init: [],
template: []
};
process_children(node.fragment.nodes, node, {
...context,
state: inner_state
});
// Use `=` so that later title changes override earlier ones
state.init.push(b.stmt(b.assignment('=', b.id('$$payload.title'), b.literal('<title>'))));
inner_state.template.push(t_string('</title>'));
// title is guaranteed to contain only text/expression tag children
state.init.push(...serialize_template(inner_state.template, b.id('title')));
},
SlotElement(node, context) {
const state = context.state;
state.template.push(block_open);
/** @type {import('estree').Property[]} */
const props = [];
/** @type {import('estree').Expression[]} */
const spreads = [];
/** @type {import('estree').ExpressionStatement[]} */
const lets = [];
/** @type {import('estree').Expression} */
let expression = b.call('$.default_slot', b.id('$$props'));
for (const attribute of node.attributes) {
if (attribute.type === 'SpreadAttribute') {
spreads.push(/** @type {import('estree').Expression} */ (context.visit(attribute)));
} else if (attribute.type === 'Attribute') {
const value = serialize_attribute_value(attribute.value, context, false, true);
if (attribute.name === 'name') {
expression = b.member(b.member_id('$$props.$$slots'), value, true, true);
} else if (attribute.name !== 'slot') {
if (attribute.metadata.dynamic) {
props.push(b.get(attribute.name, [b.return(value)]));
} else {
props.push(b.init(attribute.name, value));
}
}
} else if (attribute.type === 'LetDirective') {
lets.push(/** @type {import('estree').ExpressionStatement} */ (context.visit(attribute)));
}
}
// Let bindings first, they can be used on attributes
context.state.init.push(...lets);
const props_expression =
spreads.length === 0
? b.object(props)
: b.call('$.spread_props', b.array([b.object(props), ...spreads]));
const fallback =
node.fragment.nodes.length === 0
? b.literal(null)
: b.thunk(b.block(create_block(node, node.fragment.nodes, context)));
const slot = b.call('$.slot', b.id('$$payload'), expression, props_expression, fallback);
state.template.push(t_statement(b.stmt(slot)));
state.template.push(block_close);
},
SvelteHead(node, context) {
const state = context.state;
const body = create_block(node, node.fragment.nodes, context);
state.template.push(
t_statement(
b.stmt(b.call('$.head', b.id('$$payload'), b.arrow([b.id('$$payload')], b.block(body))))
)
);
},
// @ts-ignore: need to extract this out somehow
CallExpression: javascript_visitors_runes.CallExpression
};
/**
* 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 {import('#compiler').RegularElement | import('#compiler').SvelteElement} node
* @param {import('zimmerframe').Context<import('#compiler').SvelteNode, import('./types').ComponentServerTransformState>} context
*/
function serialize_element_attributes(node, context) {
/** @type {Array<import('#compiler').Attribute | import('#compiler').SpreadAttribute>} */
const attributes = [];
/** @type {import('#compiler').ClassDirective[]} */
const class_directives = [];
/** @type {import('#compiler').StyleDirective[]} */
const style_directives = [];
/** @type {import('estree').ExpressionStatement[]} */
const lets = [];
/** @type {{ escape: boolean; expression: import('estree').Expression } | null} */
let content = null;
let has_spread = false;
// Use the index to keep the attributes order which is important for spreading
let class_attribute_idx = -1;
let style_attribute_idx = -1;
let events_to_capture = new Set();
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
if (attribute.name === 'value' && node.name === 'textarea') {
if (
attribute.value !== true &&
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 = { escape: true, expression: serialize_attribute_value(attribute.value, context) };
// 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_attribute_idx = attributes.length;
} else if (attribute.name === 'style') {
style_attribute_idx = 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 = {
escape: false,
expression: /** @type {import('estree').Expression} */ (
context.visit(attribute.expression)
)
};
} else if (attribute.name === 'value' && node.name === 'textarea') {
content = {
escape: true,
expression: /** @type {import('estree').Expression} */ (
context.visit(attribute.expression)
)
};
} else if (attribute.name === 'group') {
const value_attribute = /** @type {import('#compiler').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 {import('estree').ExpressionStatement} */ (context.visit(attribute)));
} else {
context.visit(attribute);
}
}
if (class_directives.length > 0 && !has_spread) {
const class_attribute = serialize_class_directives(
class_directives,
/** @type {import('#compiler').Attribute | null} */ (attributes[class_attribute_idx] ?? null)
);
if (class_attribute_idx === -1) {
attributes.push(class_attribute);
}
}
if (style_directives.length > 0 && !has_spread) {
serialize_style_directives(
style_directives,
/** @type {import('#compiler').Attribute | null} */ (attributes[style_attribute_idx] ?? null),
context
);
if (style_attribute_idx > -1) {
attributes.splice(style_attribute_idx, 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 {import('#compiler').Attribute[]} */ (attributes)) {
if (attribute.value === true || is_text_attribute(attribute)) {
const name = get_attribute_name(node, attribute, context);
const literal_value = /** @type {import('estree').Literal} */ (
serialize_attribute_value(
attribute.value,
context,
WhitespaceInsensitiveAttributes.includes(name)
)
).value;
if (name !== 'class' || literal_value) {
context.state.template.push(
t_string(
` ${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(
t_expression(b.call('$.attr', b.literal(name), value, b.literal(is_boolean)))
);
}
}
if (events_to_capture.size !== 0) {
for (const event of events_to_capture) {
context.state.template.push(t_string(` ${event}="this.__e=event"`));
}
}
return content;
}
/**
*
* @param {import('#compiler').ClassDirective[]} class_directives
* @param {import('#compiler').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 last = /** @type {any[]} */ (class_attribute.value).at(-1);
if (last?.type === 'Text') {
last.data += ' ';
last.raw += ' ';
} else if (last) {
/** @type {import('#compiler').Text[]} */ (class_attribute.value).push({
type: 'Text',
start: -1,
end: -1,
parent: class_attribute,
data: ' ',
raw: ' '
});
}
/** @type {import('#compiler').ExpressionTag[]} */ (class_attribute.value).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 }
});
return class_attribute;
}
/**
* @param {import('#compiler').StyleDirective[]} style_directives
* @param {import('#compiler').Attribute | null} style_attribute
* @param {import('./types').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);
});
if (style_attribute === null) {
context.state.template.push(t_expression(b.call('$.add_styles', b.object(styles))));
} else {
context.state.template.push(
t_expression(
b.call(
'$.add_styles',
b.call(
'$.merge_styles',
serialize_attribute_value(style_attribute.value, context, true),
b.object(styles)
)
)
)
);
}
}
/**
* @param {import('../../types').ComponentAnalysis} analysis
* @param {import('#compiler').ValidatedCompileOptions} options
* @returns {import('estree').Program}
*/
export function server_component(analysis, options) {
/** @type {import('./types').ComponentServerTransformState} */
const state = {
analysis,
options,
scope: analysis.module.scope,
scopes: analysis.template.scopes,
hoisted: [b.import_all('$', 'svelte/internal/server')],
legacy_reactive_statements: new Map(),
// these should be set by create_block - if they're called outside, it's a bug
get init() {
/** @type {any[]} */
const a = [];
a.push = () => {
throw new Error('init.push should not be called outside create_block');
};
return a;
},
get template() {
/** @type {any[]} */
const a = [];
a.push = () => {
throw new Error('template.push should not be called outside create_block');
};
return a;
},
metadata: {
namespace: options.namespace
},
preserve_whitespace: options.preserveWhitespace,
private_derived: new Map()
};
const module = /** @type {import('estree').Program} */ (
walk(
/** @type {import('#compiler').SvelteNode} */ (analysis.module.ast),
state,
// @ts-expect-error TODO: zimmerframe types
{
...set_scope(analysis.module.scopes),
...global_visitors,
...javascript_visitors,
...(analysis.runes ? javascript_visitors_runes : javascript_visitors_legacy)
}
)
);
const instance = /** @type {import('estree').Program} */ (
walk(
/** @type {import('#compiler').SvelteNode} */ (analysis.instance.ast),
{ ...state, scope: analysis.instance.scope },
// @ts-expect-error TODO: zimmerframe types
{
...set_scope(analysis.instance.scopes),
...global_visitors,
...javascript_visitors,
...(analysis.runes ? javascript_visitors_runes : javascript_visitors_legacy),
ImportDeclaration(node) {
state.hoisted.push(node);
return b.empty;
},
ExportNamedDeclaration(node, context) {
if (node.declaration) {
return context.visit(node.declaration);
}
return b.empty;
}
}
)
);
const template = /** @type {import('estree').Program} */ (
walk(
/** @type {import('#compiler').SvelteNode} */ (analysis.template.ast),
{ ...state, scope: analysis.template.scope },
// @ts-expect-error TODO: zimmerframe types
{
...set_scope(analysis.template.scopes),
...global_visitors,
...template_visitors
}
)
);
/** @type {import('estree').VariableDeclarator[]} */
const legacy_reactive_declarations = [];
for (const [node] of analysis.reactive_statements) {
const statement = [...state.legacy_reactive_statements].find(([n]) => n === node);
if (statement === undefined) {
throw new Error('Could not find reactive statement');
}
if (
node.body.type === 'ExpressionStatement' &&
node.body.expression.type === 'AssignmentExpression'
) {
for (const id of extract_identifiers(node.body.expression.left)) {
const binding = analysis.instance.scope.get(id.name);
if (binding?.kind === 'legacy_reactive') {
legacy_reactive_declarations.push(b.declarator(id));
}
}
}
instance.body.push(statement[1]);
}
if (legacy_reactive_declarations.length > 0) {
instance.body.unshift({
type: 'VariableDeclaration',
kind: 'let',
declarations: legacy_reactive_declarations
});
}
// If the component binds to a child, we need to put the template in a loop and repeat until legacy bindings are stable.
// We can remove this once the legacy syntax is gone.
if (analysis.uses_component_bindings) {
const snippets = template.body.filter(
(node) =>
node.type === 'FunctionDeclaration' &&
// @ts-expect-error
node.___snippet
);
const rest = template.body.filter(
(node) =>
node.type !== 'FunctionDeclaration' ||
// @ts-expect-error
!node.___snippet
);
template.body = [
...snippets,
b.let('$$settled', b.true),
b.let('$$inner_payload'),
b.stmt(
b.function(
b.id('$$render_inner'),
[b.id('$$payload')],
b.block(/** @type {import('estree').Statement[]} */ (rest))
)
),
b.do_while(
b.unary('!', b.id('$$settled')),
b.block([
b.stmt(b.assignment('=', b.id('$$settled'), b.true)),
b.stmt(
b.assignment('=', b.id('$$inner_payload'), b.call('$.copy_payload', b.id('$$payload')))
),
b.stmt(b.call('$$render_inner', b.id('$$inner_payload')))
])
),
b.stmt(b.call('$.assign_payload', b.id('$$payload'), b.id('$$inner_payload')))
];
}
if (
[...analysis.instance.scope.declarations.values()].some(
(binding) => binding.kind === 'store_sub'
)
) {
instance.body.unshift(b.var('$$store_subs'));
template.body.push(
b.if(b.id('$$store_subs'), b.stmt(b.call('$.unsubscribe_stores', b.id('$$store_subs'))))
);
}
// Propagate values of bound props upwards if they're undefined in the parent and have a value.
// Don't do this as part of the props retrieval because people could eagerly mutate the prop in the instance script.
/** @type {import('estree').Property[]} */
const props = [];
for (const [name, binding] of analysis.instance.scope.declarations) {
if (binding.kind === 'bindable_prop' && !name.startsWith('$$')) {
props.push(b.init(binding.prop_alias ?? name, b.id(name)));
}
}
for (const { name, alias } of analysis.exports) {
props.push(b.init(alias ?? name, b.id(name)));
}
if (props.length > 0) {
// This has no effect in runes mode other than throwing an error when someone passes
// undefined to a binding that has a default value.
template.body.push(b.stmt(b.call('$.bind_props', b.id('$$props'), b.object(props))));
}
/** @type {import('estree').Expression[]} */
const push_args = [];
if (options.dev) push_args.push(b.id(analysis.name));
const component_block = b.block([
b.stmt(b.call('$.push', ...push_args)),
.../** @type {import('estree').Statement[]} */ (instance.body),
.../** @type {import('estree').Statement[]} */ (template.body),
b.stmt(b.call('$.pop'))
]);
if (analysis.uses_rest_props) {
/** @type {string[]} */
const named_props = analysis.exports.map(({ name, alias }) => alias ?? name);
for (const [name, binding] of analysis.instance.scope.declarations) {
if (binding.kind === 'bindable_prop') named_props.push(binding.prop_alias ?? name);
}
component_block.body.unshift(
b.const(
'$$restProps',
b.call(
'$.rest_props',
b.id('$$sanitized_props'),
b.array(named_props.map((name) => b.literal(name)))
)
)
);
}
if (analysis.uses_props || analysis.uses_rest_props) {
component_block.body.unshift(
b.const('$$sanitized_props', b.call('$.sanitize_props', b.id('$$props')))
);
}
if (analysis.uses_slots) {
component_block.body.unshift(b.const('$$slots', b.call('$.sanitize_slots', b.id('$$props'))));
}
const body = [...state.hoisted, ...module.body];
const component_function = b.function_declaration(
b.id(analysis.name),
[b.id('$$payload'), b.id('$$props')],
component_block
);
if (options.legacy.componentApi) {
body.unshift(b.imports([['render', '$$_render']], 'svelte/server'));
body.push(
component_function,
b.stmt(
b.assignment(
'=',
b.member_id(`${analysis.name}.render`),
b.function(
null,
[b.id('$$props'), b.id('$$opts')],
b.block([
b.return(
b.call(
'$$_render',
b.id(analysis.name),
b.object([
b.init('props', b.id('$$props')),
b.init('context', b.member(b.id('$$opts'), b.id('context'), false, true))
])
)
)
])
)
)
),
b.export_default(b.id(analysis.name))
);
} else if (options.dev) {
body.push(
component_function,
b.stmt(
b.assignment(
'=',
b.member_id(`${analysis.name}.render`),
b.function(
null,
[],
b.block([
b.throw_error(
`Component.render(...) is no longer valid in Svelte 5. ` +
'See https://svelte-5-preview.vercel.app/docs/breaking-changes#components-are-no-longer-classes for more information'
)
])
)
)
),
b.export_default(b.id(analysis.name))
);
} else {
body.push(b.export_default(component_function));
}
if (options.dev && filename) {
// add `App.filename = 'App.svelte'` so that we can print useful messages later
body.unshift(
b.stmt(
b.assignment('=', b.member(b.id(analysis.name), b.id('filename')), b.literal(filename))
)
);
}
return {
type: 'Program',
sourceType: 'module',
body
};
}
/**
* @param {import('../../types').Analysis} analysis
* @param {import('#compiler').ValidatedModuleCompileOptions} options
* @returns {import('estree').Program}
*/
export function server_module(analysis, options) {
/** @type {import('./types').ServerTransformState} */
const state = {
analysis,
options,
scope: analysis.module.scope,
scopes: analysis.module.scopes,
// this is an anomaly — it can only be used in components, but it needs
// to be present for `javascript_visitors` and so is included in module
// transform state as well as component transform state
legacy_reactive_statements: new Map(),
private_derived: new Map()
};
const module = /** @type {import('estree').Program} */ (
walk(/** @type {import('#compiler').SvelteNode} */ (analysis.module.ast), state, {
...set_scope(analysis.module.scopes),
...global_visitors,
...javascript_visitors,
...javascript_visitors_runes
})
);
return {
type: 'Program',
sourceType: 'module',
body: [b.import_all('$', 'svelte/internal/server'), ...module.body]
};
}
|