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TODO cover more cases (e.g. `x.filter(y)` // should also qualify if `y` doesn't reference state, and non-state // bindings should also be fine if (binding.scope.function_depth >= context.state.scope.function_depth) { continue; } if (!context.state.analysis.runes || !key_is_item || uses_store) { flags |= EACH_ITEM_REACTIVE; break; } } if (context.state.analysis.runes && !uses_store) { flags |= EACH_ITEM_IMMUTABLE; } // Since `animate:` can only appear on elements that are the sole child of a keyed each block, // we can determine at compile time whether the each block is animated or not (in which // case it should measure animated elements before and after reconciliation). if ( node.key && node.body.nodes.some((child) => { if (child.type !== 'RegularElement' && child.type !== 'SvelteElement') return false; return child.attributes.some((attr) => attr.type === 'AnimateDirective'); }) ) { flags |= EACH_IS_ANIMATED; } if (each_node_meta.is_controlled) { flags |= EACH_IS_CONTROLLED; } // If the array is a store expression, we need to invalidate it when the array is changed. // This doesn't catch all cases, but all the ones that Svelte 4 catches, too. let store_to_invalidate = ''; if (node.expression.type === 'Identifier' || node.expression.type === 'MemberExpression') { const id = object(node.expression); if (id) { const binding = context.state.scope.get(id.name); if (binding?.kind === 'store_sub') { store_to_invalidate = id.name; } } } // Legacy mode: find the parent each blocks which contain the arrays to invalidate const indirect_dependencies = collect_parent_each_blocks(context).flatMap((block) => { const array = /** @type {Expression} */ (context.visit(block.expression)); const transitive_dependencies = build_transitive_dependencies( block.metadata.expression.dependencies, context ); return [array, ...transitive_dependencies]; }); if (each_node_meta.array_name) { indirect_dependencies.push(b.call(each_node_meta.array_name)); } else { indirect_dependencies.push(collection); const transitive_dependencies = build_transitive_dependencies( each_node_meta.expression.dependencies, context ); indirect_dependencies.push(...transitive_dependencies); } const child_state = { ...context.state, transform: { ...context.state.transform } }; /** The state used when generating the key function, if necessary */ const key_state = { ...context.state, transform: { ...context.state.transform } }; // We need to generate a unique identifier in case there's a bind:group below // which needs a reference to the index const index = each_node_meta.contains_group_binding || !node.index ? each_node_meta.index : b.id(node.index); const item = node.context.type === 'Identifier' ? node.context : b.id('$$item'); let uses_index = each_node_meta.contains_group_binding; let key_uses_index = false; if (node.index) { child_state.transform[node.index] = { read: (node) => { uses_index = true; return (flags & EACH_INDEX_REACTIVE) !== 0 ? get_value(node) : node; } }; key_state.transform[node.index] = { read: (node) => { key_uses_index = true; return node; } }; } /** @type {Statement[]} */ const declarations = []; const invalidate = b.call( '$.invalidate_inner_signals', b.thunk(b.sequence(indirect_dependencies)) ); const invalidate_store = store_to_invalidate ? b.call('$.invalidate_store', b.id('$$stores'), b.literal(store_to_invalidate)) : undefined; /** @type {Expression[]} */ const sequence = []; if (!context.state.analysis.runes) sequence.push(invalidate); if (invalidate_store) sequence.push(invalidate_store); if (node.context.type === 'Identifier') { const binding = /** @type {Binding} */ (context.state.scope.get(node.context.name)); child_state.transform[node.context.name] = { read: (node) => { if (binding.reassigned) { // we need to do `array[$$index]` instead of `$$item` or whatever // TODO 6.0 this only applies in legacy mode, reassignments are // forbidden in runes mode return b.member( each_node_meta.array_name ? b.call(each_node_meta.array_name) : collection, index, true ); } return (flags & EACH_ITEM_REACTIVE) !== 0 ? get_value(node) : node; }, assign: (_, value) => { uses_index = true; const left = b.member( each_node_meta.array_name ? b.call(each_node_meta.array_name) : collection, index, true ); return b.sequence([b.assignment('=', left, value), ...sequence]); }, mutate: (_, mutation) => b.sequence([mutation, ...sequence]) }; delete key_state.transform[node.context.name]; } else { const unwrapped = (flags & EACH_ITEM_REACTIVE) !== 0 ? b.call('$.get', item) : item; for (const path of extract_paths(node.context)) { const name = /** @type {Identifier} */ (path.node).name; const needs_derived = path.has_default_value; // to ensure that default value is only called once const fn = b.thunk( /** @type {Expression} */ (context.visit(path.expression?.(unwrapped), child_state)) ); declarations.push(b.let(path.node, needs_derived ? b.call('$.derived_safe_equal', fn) : fn)); const read = needs_derived ? get_value : b.call; child_state.transform[name] = { read, assign: (_, value) => { const left = /** @type {Pattern} */ (path.update_expression(unwrapped)); return b.sequence([b.assignment('=', left, value), ...sequence]); }, mutate: (_, mutation) => { return b.sequence([mutation, ...sequence]); } }; // we need to eagerly evaluate the expression in order to hit any // 'Cannot access x before initialization' errors if (dev) { declarations.push(b.stmt(read(b.id(name)))); } delete key_state.transform[name]; } } const block = /** @type {BlockStatement} */ (context.visit(node.body, child_state)); /** @type {Expression} */ let key_function = b.id('$.index'); if (node.metadata.keyed) { const expression = /** @type {Expression} */ ( context.visit(/** @type {Expression} */ (node.key), key_state) ); key_function = b.arrow(key_uses_index ? [node.context, index] : [node.context], expression); } if (node.index && each_node_meta.contains_group_binding) { // We needed to create a unique identifier for the index above, but we want to use the // original index name in the template, therefore create another binding declarations.push(b.let(node.index, index)); } if (dev && node.metadata.keyed) { context.state.init.push( b.stmt(b.call('$.validate_each_keys', b.thunk(collection), key_function)) ); } /** @type {Expression[]} */ const args = [ context.state.node, b.literal(flags), each_node_meta.array_name ? each_node_meta.array_name : b.thunk(collection), key_function, b.arrow( uses_index ? [b.id('$$anchor'), item, index] : [b.id('$$anchor'), item], b.block(declarations.concat(block.body)) ) ]; if (node.fallback) { args.push( b.arrow([b.id('$$anchor')], /** @type {BlockStatement} */ (context.visit(node.fallback))) ); } context.state.init.push(b.stmt(b.call('$.each', ...args))); } /** * @param {ComponentContext} context */ function collect_parent_each_blocks(context) { return /** @type {AST.EachBlock[]} */ (context.path.filter((node) => node.type === 'EachBlock')); } /** * @param {Set<Binding>} references * @param {ComponentContext} context */ function build_transitive_dependencies(references, context) { /** @type {Set<Binding>} */ const dependencies = new Set(); for (const ref of references) { const deps = collect_transitive_dependencies(ref); for (const dep of deps) { dependencies.add(dep); } } return [...dependencies].map((dep) => build_getter({ ...dep.node }, context.state)); } /** * @param {Binding} binding * @param {Set<Binding>} seen * @returns {Binding[]} */ function collect_transitive_dependencies(binding, seen = new Set()) { if (binding.kind !== 'legacy_reactive') return []; for (const dep of binding.legacy_dependencies) { if (!seen.has(dep)) { seen.add(dep); for (const transitive_dep of collect_transitive_dependencies(dep, seen)) { seen.add(transitive_dep); } } } return [...seen]; } |