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/** @import { Attribute, Comment, ExpressionTag, SvelteNode, Text } from '#compiler' */
/** @import { ComponentContext, ServerTransformState } from '../../types.js' */
import { extract_paths } from '../../../../../utils/ast.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<Text | Comment | 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.raw += sanitize_template_string(
node.type === 'Comment' ? `<!--${node.data}-->` : escape_html(node.data)
);
} else if (node.type === 'ExpressionTag' && node.expression.type === 'Literal') {
if (node.expression.value != null) {
quasi.value.raw += sanitize_template_string(escape_html(node.expression.value + ''));
}
} else {
expressions.push(b.call('$.escape', /** @type {Expression} */ (visit(node.expression))));
quasi = b.quasi('', i + 1 === sequence.length);
quasis.push(quasi);
}
}
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 serialize_template(template, out = b.id('$$payload.out'), operator = '+=') {
/** @type {TemplateElement[]} */
let quasis = [];
/** @type {Expression[]} */
let expressions = [];
/** @type {Statement[]} */
const statements = [];
const flush = () => {
statements.push(b.stmt(b.assignment(operator, out, b.template(quasis, expressions))));
quasis = [];
expressions = [];
};
for (let i = 0; i < template.length; i++) {
const node = template[i];
if (is_statement(node)) {
if (quasis.length !== 0) {
flush();
}
statements.push(node);
} else {
let last = quasis.at(-1);
if (!last) quasis.push((last = b.quasi('', false)));
if (node.type === 'Literal') {
last.value.raw +=
typeof node.value === 'string' ? sanitize_template_string(node.value) : node.value;
} else if (node.type === 'TemplateLiteral') {
last.value.raw += node.quasis[0].value.raw;
quasis.push(...node.quasis.slice(1));
expressions.push(...node.expressions);
} else {
expressions.push(node);
quasis.push(b.quasi('', i + 1 === template.length || is_statement(template[i + 1])));
}
}
}
if (quasis.length !== 0) {
flush();
}
return statements;
}
/**
*
* @param {Attribute['value']} value
* @param {ComponentContext} context
* @param {boolean} trim_whitespace
* @param {boolean} is_component
* @returns {Expression}
*/
export function serialize_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 serialize_get_binding(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),
serialize_get_binding(store_id, state)
);
}
if (Object.hasOwn(state.getters, node.name)) {
const getter = state.getters[node.name];
return typeof getter === 'function' ? getter(node) : getter;
}
return node;
}
/**
* @param {AssignmentExpression} node
* @param {import('zimmerframe').Context<SvelteNode, ServerTransformState>} context
* @param {() => any} fallback
* @returns {Expression}
*/
export function serialize_set_binding(node, context, fallback) {
const { state, visit } = context;
if (
node.left.type === 'ArrayPattern' ||
node.left.type === 'ObjectPattern' ||
node.left.type === 'RestElement'
) {
// Turn assignment into an IIFE, so that `$.set` calls etc don't produce invalid code
const tmp_id = context.state.scope.generate('tmp');
/** @type {AssignmentExpression[]} */
const original_assignments = [];
/** @type {Expression[]} */
const assignments = [];
const paths = extract_paths(node.left);
for (const path of paths) {
const value = path.expression?.(b.id(tmp_id));
const assignment = b.assignment('=', path.node, value);
original_assignments.push(assignment);
assignments.push(serialize_set_binding(assignment, context, () => assignment));
}
if (assignments.every((assignment, i) => assignment === original_assignments[i])) {
// No change to output -> nothing to transform -> we can keep the original assignment
return fallback();
}
return b.call(
b.thunk(
b.block([
b.const(tmp_id, /** @type {Expression} */ (visit(node.right))),
b.stmt(b.sequence(assignments)),
b.return(b.id(tmp_id))
])
)
);
}
if (node.left.type !== 'Identifier' && node.left.type !== 'MemberExpression') {
throw new Error(`Unexpected assignment type ${node.left.type}`);
}
let left = node.left;
while (left.type === 'MemberExpression') {
// @ts-expect-error
left = left.object;
}
if (left.type !== 'Identifier') {
return fallback();
}
const is_store = is_store_name(left.name);
const left_name = is_store ? left.name.slice(1) : left.name;
const binding = state.scope.get(left_name);
if (!binding) return fallback();
if (binding.mutation !== null) {
return binding.mutation(node, context);
}
if (
binding.kind !== 'state' &&
binding.kind !== 'frozen_state' &&
binding.kind !== 'prop' &&
binding.kind !== 'bindable_prop' &&
binding.kind !== 'each' &&
binding.kind !== 'legacy_reactive' &&
!is_store
) {
// TODO error if it's a computed (or rest prop)? or does that already happen elsewhere?
return fallback();
}
const value = get_assignment_value(node, context);
if (left === node.left) {
if (is_store) {
return b.call('$.store_set', b.id(left_name), /** @type {Expression} */ (visit(node.right)));
}
return fallback();
} else if (is_store) {
return b.call(
'$.mutate_store',
b.assignment('??=', b.id('$$store_subs'), b.object([])),
b.literal(left.name),
b.id(left_name),
b.assignment(node.operator, /** @type {Pattern} */ (visit(node.left)), value)
);
}
return fallback();
}
/**
* @param {AssignmentExpression} node
* @param {Pick<import('zimmerframe').Context<SvelteNode, ServerTransformState>, 'visit' | 'state'>} context
*/
function get_assignment_value(node, { state, visit }) {
if (node.left.type === 'Identifier') {
const operator = node.operator;
return operator === '='
? /** @type {Expression} */ (visit(node.right))
: // turn something like x += 1 into x = x + 1
b.binary(
/** @type {BinaryOperator} */ (operator.slice(0, -1)),
serialize_get_binding(node.left, state),
/** @type {Expression} */ (visit(node.right))
);
}
return /** @type {Expression} */ (visit(node.right));
}
/**
* @param {string} name
*/
function is_store_name(name) {
return name[0] === '$' && /[A-Za-z_]/.test(name[1]);
}
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