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/** @import { AST, SvelteNode } from '#compiler' */
/** @import { ComponentContext } from '../../types' */
import { is_event_attribute, is_text_attribute } from '../../../../../utils/ast.js';
import * as b from '../../../../../utils/builders.js';
import { build_template_literal, build_update } from './utils.js';
/**
* Processes an array of template nodes, joining sibling text/expression nodes
* (e.g. `{a} b {c}`) into a single update function. Along the way it creates
* corresponding template node references these updates are applied to.
* @param {SvelteNode[]} nodes
* @param {(is_text: boolean) => Expression} initial
* @param {boolean} is_element
* @param {ComponentContext} context
*/
export function process_children(nodes, initial, is_element, { visit, state }) {
const within_bound_contenteditable = state.metadata.bound_contenteditable;
let prev = initial;
let skipped = 0;
/** @typedef {Array<AST.Text | AST.ExpressionTag>} Sequence */
/** @type {Sequence} */
let sequence = [];
/** @param {boolean} is_text */
function get_node(is_text) {
if (skipped === 0) {
return prev(is_text);
}
return b.call(
'$.sibling',
prev(false),
(is_text || skipped !== 1) && b.literal(skipped),
is_text && b.true
);
}
/**
* @param {boolean} is_text
* @param {string} name
*/
function flush_node(is_text, name) {
const expression = get_node(is_text);
let id = expression;
if (id.type !== 'Identifier') {
id = b.id(state.scope.generate(name));
state.init.push(b.var(id, expression));
}
prev = () => id;
skipped = 1; // the next node is `$.sibling(id)`
return id;
}
/**
* @param {Sequence} sequence
*/
function flush_sequence(sequence) {
if (sequence.every((node) => node.type === 'Text')) {
skipped += 1;
state.template.push(sequence.map((node) => node.raw).join(''));
return;
}
state.template.push(' ');
const { has_state, has_call, value } = build_template_literal(sequence, visit, state);
// if this is a standalone `{expression}`, make sure we handle the case where
// no text node was created because the expression was empty during SSR
const is_text = sequence.length === 1;
const id = flush_node(is_text, 'text');
const update = b.stmt(b.call('$.set_text', id, value));
if (has_call && !within_bound_contenteditable) {
state.init.push(build_update(update));
} else if (has_state && !within_bound_contenteditable) {
state.update.push(update);
} else {
state.init.push(b.stmt(b.assignment('=', b.member(id, 'nodeValue'), value)));
}
}
for (const node of nodes) {
if (node.type === 'Text' || node.type === 'ExpressionTag') {
sequence.push(node);
} else {
if (sequence.length > 0) {
flush_sequence(sequence);
sequence = [];
}
let child_state = state;
if (is_static_element(node)) {
skipped += 1;
} else if (node.type === 'EachBlock' && nodes.length === 1 && is_element) {
node.metadata.is_controlled = true;
} else {
const id = flush_node(false, node.type === 'RegularElement' ? node.name : 'node');
child_state = { ...state, node: id };
}
visit(node, child_state);
}
}
if (sequence.length > 0) {
flush_sequence(sequence);
}
// if there are trailing static text nodes/elements,
// traverse to the last (n - 1) one when hydrating
if (skipped > 1) {
skipped -= 1;
state.init.push(b.stmt(b.call('$.next', skipped !== 1 && b.literal(skipped))));
}
}
/**
* @param {SvelteNode} node
*/
function is_static_element(node) {
if (node.type !== 'RegularElement') return false;
if (node.fragment.metadata.dynamic) return false;
for (const attribute of node.attributes) {
if (attribute.type !== 'Attribute') {
return false;
}
if (is_event_attribute(attribute)) {
return false;
}
if (attribute.value !== true && !is_text_attribute(attribute)) {
return false;
}
if (node.name === 'option' && attribute.name === 'value') {
return false;
}
if (node.name.includes('-')) {
return false; // we're setting all attributes on custom elements through properties
}
}
return true;
}
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