Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { hydrate_next, hydrate_node, hydrating, remove_nodes, set_hydrate_node, set_hydrating } from '../hydration.js'; import { clear_text_content, create_text, get_first_child, get_next_sibling } from '../operations.js'; import { block, branch, destroy_effect, run_out_transitions, pause_children, pause_effect, resume_effect } from '../../reactivity/effects.js'; import { source, mutable_source, set } from '../../reactivity/sources.js'; import { array_from, is_array } from '../../../shared/utils.js'; import { INERT } from '../../constants.js'; import { queue_micro_task } from '../task.js'; import { current_effect } from '../../runtime.js'; /** * The row of a keyed each block that is currently updating. We track this * so that `animate:` directives have something to attach themselves to * @type {EachItem | null} */ export let current_each_item = null; /** @param {EachItem | null} item */ export function set_current_each_item(item) { current_each_item = item; } /** * @param {any} _ * @param {number} i */ export function index(_, i) { return i; } /** * Pause multiple effects simultaneously, and coordinate their * subsequent destruction. Used in each blocks * @param {EachState} state * @param {EachItem[]} items * @param {null | Node} controlled_anchor * @param {Map<any, EachItem>} items_map */ function pause_effects(state, items, controlled_anchor, items_map) { /** @type {TransitionManager[]} */ var transitions = []; var length = items.length; for (var i = 0; i < length; i++) { pause_children(items[i].e, transitions, true); } var is_controlled = length > 0 && transitions.length === 0 && controlled_anchor !== null; // If we have a controlled anchor, it means that the each block is inside a single // DOM element, so we can apply a fast-path for clearing the contents of the element. if (is_controlled) { var parent_node = /** @type {Element} */ ( /** @type {Element} */ (controlled_anchor).parentNode ); clear_text_content(parent_node); parent_node.append(/** @type {Element} */ (controlled_anchor)); items_map.clear(); link(state, items[0].prev, items[length - 1].next); } run_out_transitions(transitions, () => { for (var i = 0; i < length; i++) { var item = items[i]; if (!is_controlled) { items_map.delete(item.k); link(state, item.prev, item.next); } destroy_effect(item.e, !is_controlled); } }); } /** * @template V * @param {Element | Comment} node The next sibling node, or the parent node if this is a 'controlled' block * @param {number} flags * @param {() => V[]} get_collection * @param {(value: V, index: number) => any} get_key * @param {(anchor: Node, item: MaybeSource<V>, index: MaybeSource<number>) => void} render_fn * @param {null | ((anchor: Node) => void)} fallback_fn * @returns {void} */ export function each(node, flags, get_collection, get_key, render_fn, fallback_fn = null) { var anchor = node; /** @type {EachState} */ var state = { flags, items: new Map(), first: null }; var is_controlled = (flags & EACH_IS_CONTROLLED) !== 0; if (is_controlled) { var parent_node = /** @type {Element} */ (node); anchor = hydrating ? set_hydrate_node(/** @type {Comment | Text} */ (get_first_child(parent_node))) : parent_node.appendChild(create_text()); } if (hydrating) { hydrate_next(); } /** @type {Effect | null} */ var fallback = null; block(() => { var collection = get_collection(); var array = is_array(collection) ? collection : collection == null ? [] : array_from(collection); var length = array.length; /** `true` if there was a hydration mismatch. Needs to be a `let` or else it isn't treeshaken out */ let mismatch = false; if (hydrating) { var is_else = /** @type {Comment} */ (anchor).data === HYDRATION_START_ELSE; if (is_else !== (length === 0)) { // hydration mismatch — remove the server-rendered DOM and start over anchor = remove_nodes(); set_hydrate_node(anchor); set_hydrating(false); mismatch = true; } } // this is separate to the previous block because `hydrating` might change if (hydrating) { /** @type {EachItem | null} */ var prev = null; /** @type {EachItem} */ var item; for (var i = 0; i < length; i++) { if ( hydrate_node.nodeType === 8 && /** @type {Comment} */ (hydrate_node).data === HYDRATION_END ) { // The server rendered fewer items than expected, // so break out and continue appending non-hydrated items anchor = /** @type {Comment} */ (hydrate_node); mismatch = true; set_hydrating(false); break; } var value = array[i]; var key = get_key(value, i); item = create_item(hydrate_node, state, prev, null, value, key, i, render_fn, flags); state.items.set(key, item); prev = item; } // remove excess nodes if (length > 0) { set_hydrate_node(remove_nodes()); } } if (!hydrating) { reconcile(array, state, anchor, render_fn, flags, get_key); } if (fallback_fn !== null) { if (length === 0) { if (fallback) { resume_effect(fallback); } else { fallback = branch(() => fallback_fn(anchor)); } } else if (fallback !== null) { pause_effect(fallback, () => { fallback = null; }); } } if (mismatch) { // continue in hydration mode set_hydrating(true); } }); if (hydrating) { anchor = hydrate_node; } } /** * Add, remove, or reorder items output by an each block as its input changes * @template V * @param {Array<V>} array * @param {EachState} state * @param {Element | Comment | Text} anchor * @param {(anchor: Node, item: MaybeSource<V>, index: number | Source<number>) => void} render_fn * @param {number} flags * @param {(value: V, index: number) => any} get_key * @returns {void} */ function reconcile(array, state, anchor, render_fn, flags, get_key) { var is_animated = (flags & EACH_IS_ANIMATED) !== 0; var should_update = (flags & (EACH_ITEM_REACTIVE | EACH_INDEX_REACTIVE)) !== 0; var length = array.length; var items = state.items; var first = state.first; var current = first; /** @type {undefined | Set<EachItem>} */ var seen; /** @type {EachItem | null} */ var prev = null; /** @type {undefined | Set<EachItem>} */ var to_animate; /** @type {EachItem[]} */ var matched = []; /** @type {EachItem[]} */ var stashed = []; /** @type {V} */ var value; /** @type {any} */ var key; /** @type {EachItem | undefined} */ var item; /** @type {number} */ var i; if (is_animated) { for (i = 0; i < length; i += 1) { value = array[i]; key = get_key(value, i); item = items.get(key); if (item !== undefined) { item.a?.measure(); (to_animate ??= new Set()).add(item); } } } for (i = 0; i < length; i += 1) { value = array[i]; key = get_key(value, i); item = items.get(key); if (item === undefined) { var child_anchor = current ? /** @type {TemplateNode} */ (current.e.nodes_start) : anchor; prev = create_item( child_anchor, state, prev, prev === null ? state.first : prev.next, value, key, i, render_fn, flags ); items.set(key, prev); matched = []; stashed = []; current = prev.next; continue; } if (should_update) { update_item(item, value, i, flags); } if ((item.e.f & INERT) !== 0) { resume_effect(item.e); if (is_animated) { item.a?.unfix(); (to_animate ??= new Set()).delete(item); } } if (item !== current) { if (seen !== undefined && seen.has(item)) { if (matched.length < stashed.length) { // more efficient to move later items to the front var start = stashed[0]; var j; prev = start.prev; var a = matched[0]; var b = matched[matched.length - 1]; for (j = 0; j < matched.length; j += 1) { move(matched[j], start, anchor); } for (j = 0; j < stashed.length; j += 1) { seen.delete(stashed[j]); } link(state, a.prev, b.next); link(state, prev, a); link(state, b, start); current = start; prev = b; i -= 1; matched = []; stashed = []; } else { // more efficient to move earlier items to the back seen.delete(item); move(item, current, anchor); link(state, item.prev, item.next); link(state, item, prev === null ? state.first : prev.next); link(state, prev, item); prev = item; } continue; } matched = []; stashed = []; while (current !== null && current.k !== key) { (seen ??= new Set()).add(current); stashed.push(current); current = current.next; } if (current === null) { continue; } item = current; } matched.push(item); prev = item; current = item.next; } if (current !== null || seen !== undefined) { var to_destroy = seen === undefined ? [] : array_from(seen); while (current !== null) { to_destroy.push(current); current = current.next; } var destroy_length = to_destroy.length; if (destroy_length > 0) { var controlled_anchor = (flags & EACH_IS_CONTROLLED) !== 0 && length === 0 ? anchor : null; if (is_animated) { for (i = 0; i < destroy_length; i += 1) { to_destroy[i].a?.measure(); } for (i = 0; i < destroy_length; i += 1) { to_destroy[i].a?.fix(); } } pause_effects(state, to_destroy, controlled_anchor, items); } } if (is_animated) { queue_micro_task(() => { if (to_animate === undefined) return; for (item of to_animate) { item.a?.apply(); } }); } /** @type {Effect} */ (current_effect).first = state.first && state.first.e; /** @type {Effect} */ (current_effect).last = prev && prev.e; } /** * @param {EachItem} item * @param {any} value * @param {number} index * @param {number} type * @returns {void} */ function update_item(item, value, index, type) { if ((type & EACH_ITEM_REACTIVE) !== 0) { set(item.v, value); } if ((type & EACH_INDEX_REACTIVE) !== 0) { set(/** @type {Value<number>} */ (item.i), index); } else { item.i = index; } } /** * @template V * @param {Node} anchor * @param {EachState} state * @param {EachItem | null} prev * @param {EachItem | null} next * @param {V} value * @param {unknown} key * @param {number} index * @param {(anchor: Node, item: V | Source<V>, index: number | Value<number>) => void} render_fn * @param {number} flags * @returns {EachItem} */ function create_item(anchor, state, prev, next, value, key, index, render_fn, flags) { var previous_each_item = current_each_item; try { var reactive = (flags & EACH_ITEM_REACTIVE) !== 0; var mutable = (flags & EACH_ITEM_IMMUTABLE) === 0; var v = reactive ? (mutable ? mutable_source(value) : source(value)) : value; var i = (flags & EACH_INDEX_REACTIVE) === 0 ? index : source(index); /** @type {EachItem} */ var item = { i, v, k: key, a: null, // @ts-expect-error e: null, prev, next }; current_each_item = item; item.e = branch(() => render_fn(anchor, v, i), hydrating); item.e.prev = prev && prev.e; item.e.next = next && next.e; if (prev === null) { state.first = item; } else { prev.next = item; prev.e.next = item.e; } if (next !== null) { next.prev = item; next.e.prev = item.e; } return item; } finally { current_each_item = previous_each_item; } } /** * @param {EachItem} item * @param {EachItem | null} next * @param {Text | Element | Comment} anchor */ function move(item, next, anchor) { var end = item.next ? /** @type {TemplateNode} */ (item.next.e.nodes_start) : anchor; var dest = next ? /** @type {TemplateNode} */ (next.e.nodes_start) : anchor; var node = /** @type {TemplateNode} */ (item.e.nodes_start); while (node !== end) { var next_node = /** @type {TemplateNode} */ (get_next_sibling(node)); dest.before(node); node = next_node; } } /** * @param {EachState} state * @param {EachItem | null} prev * @param {EachItem | null} next */ function link(state, prev, next) { if (prev === null) { state.first = next; } else { prev.next = next; prev.e.next = next && next.e; } if (next !== null) { next.prev = prev; next.e.prev = prev && prev.e; } } |