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/** @import { SvelteNode } from '#compiler' */
/** @import { Context } from '../types' */
import { get_rune } from '../../scope.js';
import * as e from '../../../errors.js';
import { get_parent, unwrap_optional } from '../../../utils/ast.js';
import { is_safe_identifier } from './shared/utils.js';
/**
* @param {CallExpression} node
* @param {Context} context
*/
export function CallExpression(node, context) {
const parent = /** @type {SvelteNode} */ (get_parent(context.path, -1));
const rune = get_rune(node, context.state.scope);
switch (rune) {
case null:
if (!is_safe_identifier(node.callee, context.state.scope)) {
context.state.analysis.needs_context = true;
}
break;
case '$bindable':
if (node.arguments.length > 1) {
e.rune_invalid_arguments_length(node, '$bindable', 'zero or one arguments');
}
if (
parent.type !== 'AssignmentPattern' ||
context.path.at(-3)?.type !== 'ObjectPattern' ||
context.path.at(-4)?.type !== 'VariableDeclarator' ||
get_rune(
/** @type {VariableDeclarator} */ (context.path.at(-4)).init,
context.state.scope
) !== '$props'
) {
e.bindable_invalid_location(node);
}
break;
case '$host':
if (node.arguments.length > 0) {
e.rune_invalid_arguments(node, '$host');
} else if (context.state.ast_type === 'module' || !context.state.analysis.custom_element) {
e.host_invalid_placement(node);
}
break;
case '$props':
if (context.state.has_props_rune) {
e.props_duplicate(node);
}
context.state.has_props_rune = true;
if (
parent.type !== 'VariableDeclarator' ||
context.state.ast_type !== 'instance' ||
context.state.scope !== context.state.analysis.instance.scope
) {
e.props_invalid_placement(node);
}
if (node.arguments.length > 0) {
e.rune_invalid_arguments(node, rune);
}
break;
case '$state':
case '$state.frozen':
case '$derived':
case '$derived.by':
if (
parent.type !== 'VariableDeclarator' &&
!(parent.type === 'PropertyDefinition' && !parent.static && !parent.computed)
) {
e.state_invalid_placement(node, rune);
}
if ((rune === '$derived' || rune === '$derived.by') && node.arguments.length !== 1) {
e.rune_invalid_arguments_length(node, rune, 'exactly one argument');
} else if (rune === '$state' && node.arguments.length > 1) {
e.rune_invalid_arguments_length(node, rune, 'zero or one arguments');
}
break;
case '$effect':
case '$effect.pre':
if (parent.type !== 'ExpressionStatement') {
e.effect_invalid_placement(node);
}
if (node.arguments.length !== 1) {
e.rune_invalid_arguments_length(node, rune, 'exactly one argument');
}
// `$effect` needs context because Svelte needs to know whether it should re-run
// effects that invalidate themselves, and that's determined by whether we're in runes mode
context.state.analysis.needs_context = true;
break;
case '$effect.tracking':
if (node.arguments.length !== 0) {
e.rune_invalid_arguments(node, rune);
}
break;
case '$effect.root':
if (node.arguments.length !== 1) {
e.rune_invalid_arguments_length(node, rune, 'exactly one argument');
}
break;
case '$inspect':
if (node.arguments.length < 1) {
e.rune_invalid_arguments_length(node, rune, 'one or more arguments');
}
break;
case '$inspect().with':
if (node.arguments.length !== 1) {
e.rune_invalid_arguments_length(node, rune, 'exactly one argument');
}
break;
case '$state.snapshot':
if (node.arguments.length !== 1) {
e.rune_invalid_arguments_length(node, rune, 'exactly one argument');
}
break;
case '$state.is':
if (node.arguments.length !== 2) {
e.rune_invalid_arguments_length(node, rune, 'exactly two arguments');
}
break;
}
if (context.state.expression && !is_known_safe_call(node, context)) {
context.state.expression.has_call = true;
context.state.expression.has_state = true;
}
if (context.state.render_tag) {
// Find out which of the render tag arguments contains this call expression
const arg_idx = unwrap_optional(context.state.render_tag.expression).arguments.findIndex(
(arg) => arg === node || context.path.includes(arg)
);
// -1 if this is the call expression of the render tag itself
if (arg_idx !== -1) {
context.state.render_tag.metadata.args_with_call_expression.add(arg_idx);
}
}
if (node.callee.type === 'Identifier') {
const binding = context.state.scope.get(node.callee.name);
if (binding !== null) {
binding.is_called = true;
}
}
// `$inspect(foo)` or `$derived(foo) should not trigger the `static-state-reference` warning
if (rune === '$inspect' || rune === '$derived') {
context.next({ ...context.state, function_depth: context.state.function_depth + 1 });
} else {
context.next();
}
}
/**
* @param {CallExpression} node
* @param {Context} context
* @returns {boolean}
*/
function is_known_safe_call(node, context) {
const callee = node.callee;
// String / Number / BigInt / Boolean casting calls
if (callee.type === 'Identifier') {
const name = callee.name;
const binding = context.state.scope.get(name);
if (
binding === null &&
(name === 'BigInt' || name === 'String' || name === 'Number' || name === 'Boolean')
) {
return true;
}
}
// TODO add more cases
return false;
}
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