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/** @import { AST, SvelteNode } from '#compiler' */
/** @import { ComponentContext, ServerTransformState } from '../../types.js' */
import { escape_html } from '../../../../../../escaping.js';
import {
BLOCK_CLOSE,
BLOCK_OPEN,
EMPTY_COMMENT
} from '../../../../../../internal/server/hydration.js';
import * as b from '../../../../../utils/builders.js';
import { sanitize_template_string } from '../../../../../utils/sanitize_template_string.js';
import { regex_whitespaces_strict } from '../../../../patterns.js';
/** Opens an if/each block, so that we can remove nodes in the case of a mismatch */
export const block_open = b.literal(BLOCK_OPEN);
/** Closes an if/each block, so that we can remove nodes in the case of a mismatch. Also serves as an anchor for these blocks */
export const block_close = b.literal(BLOCK_CLOSE);
/** Empty comment to keep text nodes separate, or provide an anchor node for blocks */
export const empty_comment = b.literal(EMPTY_COMMENT);
/**
* Processes an array of template nodes, joining sibling text/expression nodes and
* recursing into child nodes.
* @param {Array<SvelteNode>} nodes
* @param {ComponentContext} context
*/
export function process_children(nodes, { visit, state }) {
/** @type {Array<AST.Text | AST.Comment | AST.ExpressionTag>} */
let sequence = [];
function flush() {
let quasi = b.quasi('', false);
const quasis = [quasi];
/** @type {Expression[]} */
const expressions = [];
for (let i = 0; i < sequence.length; i++) {
const node = sequence[i];
if (node.type === 'Text' || node.type === 'Comment') {
quasi.value.cooked +=
node.type === 'Comment' ? `<!--${node.data}-->` : escape_html(node.data);
} else if (node.type === 'ExpressionTag' && node.expression.type === 'Literal') {
if (node.expression.value != null) {
quasi.value.cooked += escape_html(node.expression.value + '');
}
} else {
expressions.push(b.call('$.escape', /** @type {Expression} */ (visit(node.expression))));
quasi = b.quasi('', i + 1 === sequence.length);
quasis.push(quasi);
}
}
for (const quasi of quasis) {
quasi.value.raw = sanitize_template_string(/** @type {string} */ (quasi.value.cooked));
}
state.template.push(b.template(quasis, expressions));
}
for (let i = 0; i < nodes.length; i += 1) {
const node = nodes[i];
if (node.type === 'Text' || node.type === 'Comment' || node.type === 'ExpressionTag') {
sequence.push(node);
} else {
if (sequence.length > 0) {
flush();
sequence = [];
}
visit(node, { ...state });
}
}
if (sequence.length > 0) {
flush();
}
}
/**
* @param {Node} node
* @returns {node is Statement}
*/
function is_statement(node) {
return node.type.endsWith('Statement') || node.type.endsWith('Declaration');
}
/**
* @param {Array<Statement | Expression>} template
* @param {Identifier} out
* @param {AssignmentOperator} operator
* @returns {Statement[]}
*/
export function build_template(template, out = b.id('$$payload.out'), operator = '+=') {
/** @type {string[]} */
let strings = [];
/** @type {Expression[]} */
let expressions = [];
/** @type {Statement[]} */
const statements = [];
const flush = () => {
statements.push(
b.stmt(
b.assignment(
operator,
out,
b.template(
strings.map((cooked, i) => b.quasi(cooked, i === strings.length - 1)),
expressions
)
)
)
);
strings = [];
expressions = [];
};
for (let i = 0; i < template.length; i++) {
const node = template[i];
if (is_statement(node)) {
if (strings.length !== 0) {
flush();
}
statements.push(node);
} else {
if (strings.length === 0) {
strings.push('');
}
if (node.type === 'Literal') {
strings[strings.length - 1] += node.value;
} else if (node.type === 'TemplateLiteral') {
strings[strings.length - 1] += node.quasis[0].value.cooked;
strings.push(...node.quasis.slice(1).map((q) => /** @type {string} */ (q.value.cooked)));
expressions.push(...node.expressions);
} else {
expressions.push(node);
strings.push('');
}
}
}
if (strings.length !== 0) {
flush();
}
return statements;
}
/**
*
* @param {AST.Attribute['value']} value
* @param {ComponentContext} context
* @param {boolean} trim_whitespace
* @param {boolean} is_component
* @returns {Expression}
*/
export function build_attribute_value(
value,
context,
trim_whitespace = false,
is_component = false
) {
if (value === true) {
return b.true;
}
if (!Array.isArray(value) || value.length === 1) {
const chunk = Array.isArray(value) ? value[0] : value;
if (chunk.type === 'Text') {
const data = trim_whitespace
? chunk.data.replace(regex_whitespaces_strict, ' ').trim()
: chunk.data;
return b.literal(is_component ? data : escape_html(data, true));
}
return /** @type {Expression} */ (context.visit(chunk.expression));
}
let quasi = b.quasi('', false);
const quasis = [quasi];
/** @type {Expression[]} */
const expressions = [];
for (let i = 0; i < value.length; i++) {
const node = value[i];
if (node.type === 'Text') {
quasi.value.raw += trim_whitespace
? node.data.replace(regex_whitespaces_strict, ' ')
: node.data;
} else {
expressions.push(
b.call('$.stringify', /** @type {Expression} */ (context.visit(node.expression)))
);
quasi = b.quasi('', i + 1 === value.length);
quasis.push(quasi);
}
}
return b.template(quasis, expressions);
}
/**
* @param {Identifier} node
* @param {ServerTransformState} state
* @returns {Expression}
*/
export function build_getter(node, state) {
const binding = state.scope.get(node.name);
if (binding === null || node === binding.node) {
// No associated binding or the declaration itself which shouldn't be transformed
return node;
}
if (binding.kind === 'store_sub') {
const store_id = b.id(node.name.slice(1));
return b.call(
'$.store_get',
b.assignment('??=', b.id('$$store_subs'), b.object([])),
b.literal(node.name),
build_getter(store_id, state)
);
}
return node;
}
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