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/** @import { Binding, SvelteNode } from '#compiler' */
/** @import { ClientTransformState, ComponentClientTransformState, ComponentContext } from './types.js' */
/** @import { Analysis } from '../../types.js' */
/** @import { Scope } from '../../scope.js' */
import * as b from '../../../utils/builders.js';
import { extract_identifiers, is_simple_expression } from '../../../utils/ast.js';
import {
PROPS_IS_LAZY_INITIAL,
PROPS_IS_IMMUTABLE,
PROPS_IS_RUNES,
PROPS_IS_UPDATED,
PROPS_IS_BINDABLE
} from '../../../../constants.js';
import { dev } from '../../../state.js';
import { get_value } from './visitors/shared/declarations.js';
/**
* @param {Binding} binding
* @param {Analysis} analysis
* @returns {boolean}
*/
export function is_state_source(binding, analysis) {
return (
(binding.kind === 'state' || binding.kind === 'raw_state') &&
(!analysis.immutable || binding.reassigned || analysis.accessors)
);
}
/**
* @param {Identifier} node
* @param {ClientTransformState} state
* @returns {Expression}
*/
export function build_getter(node, state) {
if (Object.hasOwn(state.transform, node.name)) {
const binding = state.scope.get(node.name);
// don't transform the declaration itself
if (node !== binding?.node) {
return state.transform[node.name].read(node);
}
}
return node;
}
/**
* @param {Expression} value
* @param {Expression} previous
*/
export function build_proxy_reassignment(value, previous) {
return dev ? b.call('$.proxy', value, b.null, previous) : b.call('$.proxy', value);
}
/**
* @param {FunctionDeclaration | FunctionExpression | ArrowFunctionExpression} node
* @param {ComponentContext} context
* @returns {Pattern[]}
*/
function get_hoisted_params(node, context) {
const scope = context.state.scope;
/** @type {Identifier[]} */
const params = [];
/**
* We only want to push if it's not already present to avoid name clashing
* @param {Identifier} id
*/
function push_unique(id) {
if (!params.find((param) => param.name === id.name)) {
params.push(id);
}
}
for (const [reference] of scope.references) {
let binding = scope.get(reference);
if (binding !== null && !scope.declarations.has(reference) && binding.initial !== node) {
if (binding.kind === 'store_sub') {
// We need both the subscription for getting the value and the store for updating
push_unique(b.id(binding.node.name));
binding = /** @type {Binding} */ (scope.get(binding.node.name.slice(1)));
}
let expression = context.state.transform[reference]?.read(b.id(binding.node.name));
if (
// If it's a destructured derived binding, then we can extract the derived signal reference and use that.
// TODO this code is bad, we need to kill it
expression != null &&
typeof expression !== 'function' &&
expression.type === 'MemberExpression' &&
expression.object.type === 'CallExpression' &&
expression.object.callee.type === 'Identifier' &&
expression.object.callee.name === '$.get' &&
expression.object.arguments[0].type === 'Identifier'
) {
push_unique(b.id(expression.object.arguments[0].name));
} else if (
// If we are referencing a simple $$props value, then we need to reference the object property instead
(binding.kind === 'prop' || binding.kind === 'bindable_prop') &&
!is_prop_source(binding, context.state)
) {
push_unique(b.id('$$props'));
} else if (
// imports don't need to be hoisted
binding.declaration_kind !== 'import'
) {
// create a copy to remove start/end tags which would mess up source maps
push_unique(b.id(binding.node.name));
// rest props are often accessed through the $$props object for optimization reasons,
// but we can't know if the delegated event handler will use it, so we need to add both as params
if (binding.kind === 'rest_prop' && context.state.analysis.runes) {
push_unique(b.id('$$props'));
}
}
}
}
return params;
}
/**
* @param {FunctionDeclaration | FunctionExpression | ArrowFunctionExpression} node
* @param {ComponentContext} context
* @returns {Pattern[]}
*/
export function build_hoisted_params(node, context) {
const hoisted_params = get_hoisted_params(node, context);
node.metadata.hoisted_params = hoisted_params;
/** @type {Pattern[]} */
const params = [];
if (node.params.length === 0) {
if (hoisted_params.length > 0) {
// For the event object
params.push(b.id('_'));
}
} else {
for (const param of node.params) {
params.push(/** @type {Pattern} */ (context.visit(param)));
}
}
params.push(...hoisted_params);
return params;
}
/**
* @param {Binding} binding
* @param {ComponentClientTransformState} state
* @param {string} name
* @param {Expression | null} [initial]
* @returns
*/
export function get_prop_source(binding, state, name, initial) {
/** @type {Expression[]} */
const args = [b.id('$$props'), b.literal(name)];
let flags = 0;
if (binding.kind === 'bindable_prop') {
flags |= PROPS_IS_BINDABLE;
}
if (state.analysis.immutable) {
flags |= PROPS_IS_IMMUTABLE;
}
if (state.analysis.runes) {
flags |= PROPS_IS_RUNES;
}
if (
state.analysis.accessors ||
(state.analysis.immutable
? binding.reassigned || (state.analysis.runes && binding.mutated)
: binding.updated)
) {
flags |= PROPS_IS_UPDATED;
}
/** @type {Expression | undefined} */
let arg;
if (initial) {
// To avoid eagerly evaluating the right-hand-side, we wrap it in a thunk if necessary
if (is_simple_expression(initial)) {
arg = initial;
} else {
if (
initial.type === 'CallExpression' &&
initial.callee.type === 'Identifier' &&
initial.arguments.length === 0
) {
arg = initial.callee;
} else {
arg = b.thunk(initial);
}
flags |= PROPS_IS_LAZY_INITIAL;
}
}
if (flags || arg) {
args.push(b.literal(flags));
if (arg) args.push(arg);
}
return b.call('$.prop', ...args);
}
/**
*
* @param {Binding} binding
* @param {ClientTransformState} state
* @returns
*/
export function is_prop_source(binding, state) {
return (
(binding.kind === 'prop' || binding.kind === 'bindable_prop') &&
(!state.analysis.runes ||
state.analysis.accessors ||
binding.reassigned ||
binding.initial ||
// Until legacy mode is gone, we also need to use the prop source when only mutated is true,
// because the parent could be a legacy component which needs coarse-grained reactivity
binding.updated)
);
}
/**
* @param {Expression} node
* @param {Scope | null} scope
*/
export function should_proxy(node, scope) {
if (
!node ||
node.type === 'Literal' ||
node.type === 'TemplateLiteral' ||
node.type === 'ArrowFunctionExpression' ||
node.type === 'FunctionExpression' ||
node.type === 'UnaryExpression' ||
node.type === 'BinaryExpression' ||
(node.type === 'Identifier' && node.name === 'undefined')
) {
return false;
}
if (node.type === 'Identifier' && scope !== null) {
const binding = scope.get(node.name);
// Let's see if the reference is something that can be proxied
if (
binding !== null &&
!binding.reassigned &&
binding.initial !== null &&
binding.initial.type !== 'FunctionDeclaration' &&
binding.initial.type !== 'ClassDeclaration' &&
binding.initial.type !== 'ImportDeclaration' &&
binding.initial.type !== 'EachBlock'
) {
return should_proxy(binding.initial, null);
}
}
return true;
}
/**
* @param {Pattern} node
* @param {import('zimmerframe').Context<SvelteNode, ComponentClientTransformState>} context
* @returns {{ id: Pattern, declarations: null | Statement[] }}
*/
export function create_derived_block_argument(node, context) {
if (node.type === 'Identifier') {
context.state.transform[node.name] = { read: get_value };
return { id: node, declarations: null };
}
const pattern = /** @type {Pattern} */ (context.visit(node));
const identifiers = extract_identifiers(node);
const id = b.id('$$source');
const value = b.id('$$value');
const block = b.block([
b.var(pattern, b.call('$.get', id)),
b.return(b.object(identifiers.map((identifier) => b.prop('init', identifier, identifier))))
]);
const declarations = [b.var(value, create_derived(context.state, b.thunk(block)))];
for (const id of identifiers) {
context.state.transform[id.name] = { read: get_value };
declarations.push(
b.var(id, create_derived(context.state, b.thunk(b.member(b.call('$.get', value), id))))
);
}
return { id, declarations };
}
/**
* Svelte legacy mode should use safe equals in most places, runes mode shouldn't
* @param {ComponentClientTransformState} state
* @param {Expression} arg
*/
export function create_derived(state, arg) {
return b.call(state.analysis.runes ? '$.derived' : '$.derived_safe_equal', arg);
}
/**
* Whether a variable can be referenced directly from template string.
* @param {import('#compiler').Binding | undefined} binding
* @returns {boolean}
*/
export function can_inline_variable(binding) {
return (
!!binding &&
// in a `<script module>` block
!binding.scope.parent &&
// to prevent the need for escaping
binding.initial?.type === 'Literal'
);
}
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