Press n or j to go to the next uncovered block, b, p or k for the previous block.
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/** @import { ExpressionTag, SvelteNode, Text } from '#compiler' */
/** @import { ComponentClientTransformState, ComponentContext } from '../../types' */
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} expression
* @param {boolean} is_element
* @param {ComponentContext} context
*/
export function process_children(nodes, expression, is_element, { visit, state }) {
const within_bound_contenteditable = state.metadata.bound_contenteditable;
/** @typedef {Array<Text | ExpressionTag>} Sequence */
/** @type {Sequence} */
let sequence = [];
/**
* @param {Sequence} sequence
*/
function flush_sequence(sequence) {
if (sequence.length === 1) {
const node = sequence[0];
if (node.type === 'Text') {
let prev = expression;
expression = () => b.call('$.sibling', prev(true));
state.template.push(node.raw);
return;
}
state.template.push(' ');
const text_id = get_node_id(expression(true), state, 'text');
const update = b.stmt(
b.call('$.set_text', text_id, /** @type {Expression} */ (visit(node.expression, state)))
);
if (node.metadata.expression.has_call && !within_bound_contenteditable) {
state.init.push(build_update(update));
} else if (node.metadata.expression.has_state && !within_bound_contenteditable) {
state.update.push(update);
} else {
state.init.push(
b.stmt(
b.assignment(
'=',
b.member(text_id, b.id('nodeValue')),
/** @type {Expression} */ (visit(node.expression))
)
)
);
}
expression = (is_text) =>
is_text ? b.call('$.sibling', text_id, b.true) : b.call('$.sibling', text_id);
} else {
const text_id = get_node_id(expression(true), state, 'text');
state.template.push(' ');
const { has_state, has_call, value } = build_template_literal(sequence, visit, state);
const update = b.stmt(b.call('$.set_text', text_id, value));
if (has_call && !within_bound_contenteditable) {
state.init.push(build_update(update));
} else if (has_state && !within_bound_contenteditable) {
state.update.push(update);
} else {
state.init.push(b.stmt(b.assignment('=', b.member(text_id, b.id('nodeValue')), value)));
}
expression = (is_text) =>
is_text ? b.call('$.sibling', text_id, b.true) : b.call('$.sibling', text_id);
}
}
for (let i = 0; i < nodes.length; i += 1) {
const node = nodes[i];
if (node.type === 'Text' || node.type === 'ExpressionTag') {
sequence.push(node);
} else {
if (sequence.length > 0) {
flush_sequence(sequence);
sequence = [];
}
if (
node.type === 'SvelteHead' ||
node.type === 'TitleElement' ||
node.type === 'SnippetBlock'
) {
// These nodes do not contribute to the sibling/child tree
// TODO what about e.g. ConstTag and all the other things that
// get hoisted inside clean_nodes?
visit(node, state);
} else {
if (node.type === 'EachBlock' && nodes.length === 1 && is_element) {
node.metadata.is_controlled = true;
visit(node, state);
} else {
const id = get_node_id(
expression(false),
state,
node.type === 'RegularElement' ? node.name : 'node'
);
expression = (is_text) =>
is_text ? b.call('$.sibling', id, b.true) : b.call('$.sibling', id);
visit(node, {
...state,
node: id
});
}
}
}
}
if (sequence.length > 0) {
// if the final item in a fragment is static text,
// we need to force `hydrate_node` to advance
if (sequence.length === 1 && sequence[0].type === 'Text' && nodes.length > 1) {
state.init.push(b.stmt(b.call('$.next')));
}
flush_sequence(sequence);
}
}
/**
* @param {Expression} expression
* @param {ComponentClientTransformState} state
* @param {string} name
*/
function get_node_id(expression, state, name) {
let id = expression;
if (id.type !== 'Identifier') {
id = b.id(state.scope.generate(name));
state.init.push(b.var(id, expression));
}
return id;
}
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