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/** @import { AST, Binding } from '#compiler' */
/** @import { AnalysisState, Context } from '../../types' */
/** @import { Scope } from '../../../scope' */
/** @import { NodeLike } from '../../../../errors.js' */
import * as e from '../../../../errors.js';
import { extract_identifiers, object } from '../../../../utils/ast.js';
import * as w from '../../../../warnings.js';
/**
* @param {AssignmentExpression | UpdateExpression} node
* @param {Pattern | Expression} argument
* @param {AnalysisState} state
*/
export function validate_assignment(node, argument, state) {
validate_no_const_assignment(node, argument, state.scope, false);
if (argument.type === 'Identifier') {
const binding = state.scope.get(argument.name);
if (state.analysis.runes) {
if (binding?.kind === 'derived') {
e.constant_assignment(node, 'derived state');
}
if (binding?.kind === 'each') {
e.each_item_invalid_assignment(node);
}
}
if (binding?.kind === 'snippet') {
e.snippet_parameter_assignment(node);
}
}
let object = /** @type {Expression | Super} */ (argument);
/** @type {Expression | PrivateIdentifier | null} */
let property = null;
while (object.type === 'MemberExpression') {
property = object.property;
object = object.object;
}
if (object.type === 'ThisExpression' && property?.type === 'PrivateIdentifier') {
if (state.private_derived_state.includes(property.name)) {
e.constant_assignment(node, 'derived state');
}
}
}
/**
* @param {NodeLike} node
* @param {Pattern | Expression} argument
* @param {Scope} scope
* @param {boolean} is_binding
*/
export function validate_no_const_assignment(node, argument, scope, is_binding) {
if (argument.type === 'ArrayPattern') {
for (const element of argument.elements) {
if (element) {
validate_no_const_assignment(node, element, scope, is_binding);
}
}
} else if (argument.type === 'ObjectPattern') {
for (const element of argument.properties) {
if (element.type === 'Property') {
validate_no_const_assignment(node, element.value, scope, is_binding);
}
}
} else if (argument.type === 'Identifier') {
const binding = scope.get(argument.name);
if (
binding?.kind === 'derived' ||
binding?.declaration_kind === 'import' ||
(binding?.declaration_kind === 'const' && binding.kind !== 'each')
) {
// e.invalid_const_assignment(
// node,
// is_binding,
// // This takes advantage of the fact that we don't assign initial for let directives and then/catch variables.
// // If we start doing that, we need another property on the binding to differentiate, or give up on the more precise error message.
// binding.kind !== 'state' &&
// binding.kind !== 'raw_state' &&
// (binding.kind !== 'normal' || !binding.initial)
// );
// TODO have a more specific error message for assignments to things like `{:then foo}`
const thing =
binding.declaration_kind === 'import'
? 'import'
: binding.kind === 'derived'
? 'derived state'
: 'constant';
if (is_binding) {
e.constant_binding(node, thing);
} else {
e.constant_assignment(node, thing);
}
}
}
}
/**
* Validates that the opening of a control flow block is `{` immediately followed by the expected character.
* In legacy mode whitespace is allowed inbetween. TODO remove once legacy mode is gone and move this into parser instead.
* @param {{start: number; end: number}} node
* @param {AnalysisState} state
* @param {string} expected
*/
export function validate_opening_tag(node, state, expected) {
if (state.analysis.source[node.start + 1] !== expected) {
// avoid a sea of red and only mark the first few characters
e.block_unexpected_character({ start: node.start, end: node.start + 5 }, expected);
}
}
/**
* @param {AST.Fragment | null | undefined} node
* @param {Context} context
*/
export function validate_block_not_empty(node, context) {
if (!node) return;
// Assumption: If the block has zero elements, someone's in the middle of typing it out,
// so don't warn in that case because it would be distracting.
if (node.nodes.length === 1 && node.nodes[0].type === 'Text' && !node.nodes[0].raw.trim()) {
w.block_empty(node.nodes[0]);
}
}
/**
* @param {VariableDeclarator} node
* @param {AnalysisState} state
*/
export function ensure_no_module_import_conflict(node, state) {
const ids = extract_identifiers(node.id);
for (const id of ids) {
if (
state.ast_type === 'instance' &&
state.scope === state.analysis.instance.scope &&
state.analysis.module.scope.get(id.name)?.declaration_kind === 'import'
) {
// TODO fix the message here
e.declaration_duplicate_module_import(node.id);
}
}
}
/**
* A 'safe' identifier means that the `foo` in `foo.bar` or `foo()` will not
* call functions that require component context to exist
* @param {Expression | Super} expression
* @param {Scope} scope
*/
export function is_safe_identifier(expression, scope) {
let node = expression;
while (node.type === 'MemberExpression') node = node.object;
if (node.type !== 'Identifier') return false;
const binding = scope.get(node.name);
if (!binding) return true;
if (binding.kind === 'store_sub') {
return is_safe_identifier({ name: node.name.slice(1), type: 'Identifier' }, scope);
}
return (
binding.declaration_kind !== 'import' &&
binding.kind !== 'prop' &&
binding.kind !== 'bindable_prop' &&
binding.kind !== 'rest_prop'
);
}
/**
* @param {Expression | Super} node
* @param {Context} context
* @returns {boolean}
*/
export function is_pure(node, context) {
if (node.type !== 'Identifier' && node.type !== 'MemberExpression') {
return false;
}
const left = object(node);
if (!left) return false;
if (left.type === 'Identifier') {
const binding = context.state.scope.get(left.name);
if (binding === null) return true; // globals are assumed to be safe
}
// TODO add more cases (safe Svelte imports, etc)
return false;
}
/**
* Checks if the name is valid, which it is when it's not starting with (or is) a dollar sign or if it's a function parameter.
* The second argument is the depth of the scope, which is there for backwards compatibility reasons: In Svelte 4, you
* were allowed to define `$`-prefixed variables anywhere below the top level of components. Once legacy mode is gone, this
* argument can be removed / the call sites adjusted accordingly.
* @param {Binding | null} binding
* @param {number | undefined} [function_depth]
*/
export function validate_identifier_name(binding, function_depth) {
if (!binding) return;
const declaration_kind = binding.declaration_kind;
if (
declaration_kind !== 'synthetic' &&
declaration_kind !== 'param' &&
declaration_kind !== 'rest_param' &&
(!function_depth || function_depth <= 1)
) {
const node = binding.node;
if (node.name === '$') {
e.dollar_binding_invalid(node);
} else if (node.name.startsWith('$')) {
e.dollar_prefix_invalid(node);
}
}
}
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