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/** @import * as ESTree from 'estree' */
import { walk } from 'zimmerframe';
import * as b from '../utils/builders.js';
/**
* Gets the left-most identifier of a member expression or identifier.
* @param {ESTree.MemberExpression | ESTree.Identifier} expression
* @returns {ESTree.Identifier | null}
*/
export function object(expression) {
while (expression.type === 'MemberExpression') {
expression = /** @type {ESTree.MemberExpression | ESTree.Identifier} */ (expression.object);
}
if (expression.type !== 'Identifier') {
return null;
}
return expression;
}
/**
* Returns true if the attribute contains a single static text node.
* @param {Attribute} attribute
* @returns {attribute is Attribute & { value: [Text] }}
*/
export function is_text_attribute(attribute) {
return (
Array.isArray(attribute.value) &&
attribute.value.length === 1 &&
attribute.value[0].type === 'Text'
);
}
/**
* Returns true if the attribute contains a single expression node.
* In Svelte 5, this also includes a single expression node wrapped in an array.
* TODO change that in a future version
* @param {Attribute} attribute
* @returns {attribute is Attribute & { value: [ExpressionTag] | ExpressionTag }}
*/
export function is_expression_attribute(attribute) {
return (
(attribute.value !== true && !Array.isArray(attribute.value)) ||
(Array.isArray(attribute.value) &&
attribute.value.length === 1 &&
attribute.value[0].type === 'ExpressionTag')
);
}
/**
* Returns the single attribute expression node.
* In Svelte 5, this also includes a single expression node wrapped in an array.
* TODO change that in a future version
* @param { Attribute & { value: [ExpressionTag] | ExpressionTag }} attribute
* @returns {ESTree.Expression}
*/
export function get_attribute_expression(attribute) {
return Array.isArray(attribute.value)
? /** @type {ExpressionTag} */ (attribute.value[0]).expression
: attribute.value.expression;
}
/**
* Returns the expression chunks of an attribute value
* @param {Attribute['value']} value
* @returns {Array<Text | ExpressionTag>}
*/
export function get_attribute_chunks(value) {
return Array.isArray(value) ? value : typeof value === 'boolean' ? [] : [value];
}
/**
* Returns true if the attribute starts with `on` and contains a single expression node.
* @param {Attribute} attribute
* @returns {attribute is Attribute & { value: [ExpressionTag] | ExpressionTag }}
*/
export function is_event_attribute(attribute) {
return is_expression_attribute(attribute) && attribute.name.startsWith('on');
}
/**
* Extracts all identifiers and member expressions from a pattern.
* @param {ESTree.Pattern} pattern
* @param {Array<ESTree.Identifier | ESTree.MemberExpression>} [nodes]
* @returns {Array<ESTree.Identifier | ESTree.MemberExpression>}
*/
export function unwrap_pattern(pattern, nodes = []) {
switch (pattern.type) {
case 'Identifier':
nodes.push(pattern);
break;
case 'MemberExpression':
// member expressions can be part of an assignment pattern, but not a binding pattern
// see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#binding_and_assignment
nodes.push(pattern);
break;
case 'ObjectPattern':
for (const prop of pattern.properties) {
if (prop.type === 'RestElement') {
unwrap_pattern(prop.argument, nodes);
} else {
unwrap_pattern(prop.value, nodes);
}
}
break;
case 'ArrayPattern':
for (const element of pattern.elements) {
if (element) unwrap_pattern(element, nodes);
}
break;
case 'RestElement':
unwrap_pattern(pattern.argument, nodes);
break;
case 'AssignmentPattern':
unwrap_pattern(pattern.left, nodes);
break;
}
return nodes;
}
/**
* Extracts all identifiers from a pattern.
* @param {ESTree.Pattern} pattern
* @returns {ESTree.Identifier[]}
*/
export function extract_identifiers(pattern) {
return unwrap_pattern(pattern, []).filter((node) => node.type === 'Identifier');
}
/**
* Extracts all identifiers and a stringified keypath from an expression.
* TODO replace this with `expression.dependencies`
* @param {ESTree.Expression} expr
* @returns {[keypath: string, ids: ESTree.Identifier[]]}
*/
export function extract_all_identifiers_from_expression(expr) {
/** @type {ESTree.Identifier[]} */
let nodes = [];
/** @type {string[]} */
let keypath = [];
walk(
expr,
{},
{
Identifier(node, { path }) {
const parent = path.at(-1);
if (parent?.type !== 'MemberExpression' || parent.property !== node || parent.computed) {
nodes.push(node);
}
if (parent?.type === 'MemberExpression' && parent.computed && parent.property === node) {
keypath.push(`[${node.name}]`);
} else {
keypath.push(node.name);
}
},
Literal(node, { path }) {
const value = typeof node.value === 'string' ? `"${node.value}"` : String(node.value);
const parent = path.at(-1);
if (parent?.type === 'MemberExpression' && parent.computed && parent.property === node) {
keypath.push(`[${value}]`);
} else {
keypath.push(value);
}
},
ThisExpression(_, { next }) {
keypath.push('this');
next();
}
}
);
return [keypath.join('.'), nodes];
}
/**
* Extracts all leaf identifiers from a destructuring expression.
* @param {ESTree.Identifier | ESTree.ObjectExpression | ESTree.ArrayExpression} node
* @param {ESTree.Identifier[]} [nodes]
* @returns
*/
export function extract_identifiers_from_destructuring(node, nodes = []) {
// TODO This isn't complete, but it should be enough for our purposes
switch (node.type) {
case 'Identifier':
nodes.push(node);
break;
case 'ObjectExpression':
for (const prop of node.properties) {
if (prop.type === 'Property') {
extract_identifiers_from_destructuring(/** @type {any} */ (prop.value), nodes);
} else {
extract_identifiers_from_destructuring(/** @type {any} */ (prop.argument), nodes);
}
}
break;
case 'ArrayExpression':
for (const element of node.elements) {
if (element) extract_identifiers_from_destructuring(/** @type {any} */ (element), nodes);
}
break;
}
return nodes;
}
/**
* Represents the path of a destructured assignment from either a declaration
* or assignment expression. For example, given `const { foo: { bar: baz } } = quux`,
* the path of `baz` is `foo.bar`
* @typedef {Object} DestructuredAssignment
* @property {ESTree.Identifier | ESTree.MemberExpression} node The node the destructuring path end in. Can be a member expression only for assignment expressions
* @property {boolean} is_rest `true` if this is a `...rest` destructuring
* @property {boolean} has_default_value `true` if this has a fallback value like `const { foo = 'bar } = ..`
* @property {(expression: ESTree.Expression) => ESTree.Identifier | ESTree.MemberExpression | ESTree.CallExpression | ESTree.AwaitExpression} expression Returns an expression which walks the path starting at the given expression.
* This will be a call expression if a rest element or default is involved — e.g. `const { foo: { bar: baz = 42 }, ...rest } = quux` — since we can't represent `baz` or `rest` purely as a path
* Will be an await expression in case of an async default value (`const { foo = await bar } = ...`)
* @property {(expression: ESTree.Expression) => ESTree.Identifier | ESTree.MemberExpression | ESTree.CallExpression | ESTree.AwaitExpression} update_expression Like `expression` but without default values.
*/
/**
* Extracts all destructured assignments from a pattern.
* @param {ESTree.Node} param
* @returns {DestructuredAssignment[]}
*/
export function extract_paths(param) {
return _extract_paths(
[],
param,
(node) => /** @type {ESTree.Identifier | ESTree.MemberExpression} */ (node),
(node) => /** @type {ESTree.Identifier | ESTree.MemberExpression} */ (node),
false
);
}
/**
* @param {DestructuredAssignment[]} assignments
* @param {ESTree.Node} param
* @param {DestructuredAssignment['expression']} expression
* @param {DestructuredAssignment['update_expression']} update_expression
* @param {boolean} has_default_value
* @returns {DestructuredAssignment[]}
*/
function _extract_paths(assignments = [], param, expression, update_expression, has_default_value) {
switch (param.type) {
case 'Identifier':
case 'MemberExpression':
assignments.push({
node: param,
is_rest: false,
has_default_value,
expression,
update_expression
});
break;
case 'ObjectPattern':
for (const prop of param.properties) {
if (prop.type === 'RestElement') {
/** @type {DestructuredAssignment['expression']} */
const rest_expression = (object) => {
/** @type {ESTree.Expression[]} */
const props = [];
for (const p of param.properties) {
if (p.type === 'Property' && p.key.type !== 'PrivateIdentifier') {
if (p.key.type === 'Identifier' && !p.computed) {
props.push(b.literal(p.key.name));
} else if (p.key.type === 'Literal') {
props.push(b.literal(String(p.key.value)));
} else {
props.push(b.call('String', p.key));
}
}
}
return b.call('$.exclude_from_object', expression(object), b.array(props));
};
if (prop.argument.type === 'Identifier') {
assignments.push({
node: prop.argument,
is_rest: true,
has_default_value,
expression: rest_expression,
update_expression: rest_expression
});
} else {
_extract_paths(
assignments,
prop.argument,
rest_expression,
rest_expression,
has_default_value
);
}
} else {
/** @type {DestructuredAssignment['expression']} */
const object_expression = (object) =>
b.member(expression(object), prop.key, prop.computed || prop.key.type !== 'Identifier');
_extract_paths(
assignments,
prop.value,
object_expression,
object_expression,
has_default_value
);
}
}
break;
case 'ArrayPattern':
for (let i = 0; i < param.elements.length; i += 1) {
const element = param.elements[i];
if (element) {
if (element.type === 'RestElement') {
/** @type {DestructuredAssignment['expression']} */
const rest_expression = (object) =>
b.call(b.member(expression(object), 'slice'), b.literal(i));
if (element.argument.type === 'Identifier') {
assignments.push({
node: element.argument,
is_rest: true,
has_default_value,
expression: rest_expression,
update_expression: rest_expression
});
} else {
_extract_paths(
assignments,
element.argument,
rest_expression,
rest_expression,
has_default_value
);
}
} else {
/** @type {DestructuredAssignment['expression']} */
const array_expression = (object) => b.member(expression(object), b.literal(i), true);
_extract_paths(
assignments,
element,
array_expression,
array_expression,
has_default_value
);
}
}
}
break;
case 'AssignmentPattern': {
/** @type {DestructuredAssignment['expression']} */
const fallback_expression = (object) => build_fallback(expression(object), param.right);
if (param.left.type === 'Identifier') {
assignments.push({
node: param.left,
is_rest: false,
has_default_value: true,
expression: fallback_expression,
update_expression
});
} else {
_extract_paths(assignments, param.left, fallback_expression, update_expression, true);
}
break;
}
}
return assignments;
}
/**
* Like `path.at(x)`, but skips over `TSNonNullExpression` and `TSAsExpression` nodes and eases assertions a bit
* by removing the `| undefined` from the resulting type.
*
* @template {SvelteNode} T
* @param {T[]} path
* @param {number} at
*/
export function get_parent(path, at) {
let node = path.at(at);
// @ts-expect-error
if (node.type === 'TSNonNullExpression' || node.type === 'TSAsExpression') {
return /** @type {T} */ (path.at(at < 0 ? at - 1 : at + 1));
}
return /** @type {T} */ (node);
}
/**
* Returns `true` if the expression is an identifier, a literal, a function expression,
* or a logical expression that only contains simple expressions. Used to determine whether
* something needs to be treated as though accessing it could have side-effects (i.e.
* reading signals prematurely)
* @param {ESTree.Expression} node
* @returns {boolean}
*/
export function is_simple_expression(node) {
if (
node.type === 'Literal' ||
node.type === 'Identifier' ||
node.type === 'ArrowFunctionExpression' ||
node.type === 'FunctionExpression'
) {
return true;
}
if (node.type === 'ConditionalExpression') {
return (
is_simple_expression(node.test) &&
is_simple_expression(node.consequent) &&
is_simple_expression(node.alternate)
);
}
if (node.type === 'BinaryExpression' || node.type === 'LogicalExpression') {
return is_simple_expression(node.left) && is_simple_expression(node.right);
}
return false;
}
/**
* @template {ESTree.SimpleCallExpression | ESTree.MemberExpression} T
* @param {ESTree.ChainExpression & { expression : T } | T} node
* @returns {T}
*/
export function unwrap_optional(node) {
return node.type === 'ChainExpression' ? node.expression : node;
}
/**
* @param {ESTree.Expression | ESTree.Pattern} expression
* @returns {boolean}
*/
export function is_expression_async(expression) {
switch (expression.type) {
case 'AwaitExpression': {
return true;
}
case 'ArrayPattern': {
return expression.elements.some((element) => element && is_expression_async(element));
}
case 'ArrayExpression': {
return expression.elements.some((element) => {
if (!element) {
return false;
} else if (element.type === 'SpreadElement') {
return is_expression_async(element.argument);
} else {
return is_expression_async(element);
}
});
}
case 'AssignmentPattern':
case 'AssignmentExpression':
case 'BinaryExpression':
case 'LogicalExpression': {
return is_expression_async(expression.left) || is_expression_async(expression.right);
}
case 'CallExpression':
case 'NewExpression': {
return (
(expression.callee.type !== 'Super' && is_expression_async(expression.callee)) ||
expression.arguments.some((element) => {
if (element.type === 'SpreadElement') {
return is_expression_async(element.argument);
} else {
return is_expression_async(element);
}
})
);
}
case 'ChainExpression': {
return is_expression_async(expression.expression);
}
case 'ConditionalExpression': {
return (
is_expression_async(expression.test) ||
is_expression_async(expression.alternate) ||
is_expression_async(expression.consequent)
);
}
case 'ImportExpression': {
return is_expression_async(expression.source);
}
case 'MemberExpression': {
return (
(expression.object.type !== 'Super' && is_expression_async(expression.object)) ||
(expression.property.type !== 'PrivateIdentifier' &&
is_expression_async(expression.property))
);
}
case 'ObjectPattern':
case 'ObjectExpression': {
return expression.properties.some((property) => {
if (property.type === 'SpreadElement') {
return is_expression_async(property.argument);
} else if (property.type === 'Property') {
return (
(property.key.type !== 'PrivateIdentifier' && is_expression_async(property.key)) ||
is_expression_async(property.value)
);
}
});
}
case 'RestElement': {
return is_expression_async(expression.argument);
}
case 'SequenceExpression':
case 'TemplateLiteral': {
return expression.expressions.some((subexpression) => is_expression_async(subexpression));
}
case 'TaggedTemplateExpression': {
return is_expression_async(expression.tag) || is_expression_async(expression.quasi);
}
case 'UnaryExpression':
case 'UpdateExpression': {
return is_expression_async(expression.argument);
}
case 'YieldExpression': {
return expression.argument ? is_expression_async(expression.argument) : false;
}
default:
return false;
}
}
/**
*
* @param {ESTree.Expression} expression
* @param {ESTree.Expression} fallback
*/
export function build_fallback(expression, fallback) {
if (is_simple_expression(fallback)) {
return b.call('$.fallback', expression, fallback);
}
if (fallback.type === 'AwaitExpression' && is_simple_expression(fallback.argument)) {
return b.await(b.call('$.fallback', expression, fallback.argument));
}
return is_expression_async(fallback)
? b.await(b.call('$.fallback', expression, b.thunk(fallback, true), b.true))
: b.call('$.fallback', expression, b.thunk(fallback), b.true);
}
/**
* @param {ESTree.AssignmentOperator} operator
* @param {ESTree.Identifier | ESTree.MemberExpression} left
* @param {ESTree.Expression} right
*/
export function build_assignment_value(operator, left, right) {
return operator === '='
? right
: // turn something like x += 1 into x = x + 1
b.binary(/** @type {ESTree.BinaryOperator} */ (operator.slice(0, -1)), left, right);
}
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