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regex_ends_with_whitespaces,
regex_not_whitespace,
regex_starts_with_whitespaces
} from '../patterns.js';
import * as b from '../../utils/builders.js';
import { walk } from 'zimmerframe';
/**
* @param {import('estree').Node} node
* @returns {boolean}
*/
export function is_hoistable_function(node) {
if (
node.type === 'ArrowFunctionExpression' ||
node.type === 'FunctionExpression' ||
node.type === 'FunctionDeclaration'
) {
return node.metadata?.hoistable === true;
}
return false;
}
/**
* Extract nodes that are hoisted and trim whitespace according to the following rules:
* - trim leading and trailing whitespace, regardless of surroundings
* - keep leading / trailing whitespace of inbetween text nodes,
* unless it's whitespace-only, in which case collapse to a single whitespace for all cases
* except when it's children of certain elements where we know ignore whitespace (like td/option/head),
* in which case we remove it entirely
* @param {import('#compiler').SvelteNode} parent
* @param {import('#compiler').SvelteNode[]} nodes
* @param {import('#compiler').SvelteNode[]} path
* @param {import('#compiler').Namespace} namespace
* @param {boolean} preserve_whitespace
* @param {boolean} preserve_comments
*/
export function clean_nodes(
parent,
nodes,
path,
namespace = 'html',
preserve_whitespace,
preserve_comments
) {
/** @type {import('#compiler').SvelteNode[]} */
const hoisted = [];
/** @type {import('#compiler').SvelteNode[]} */
const regular = [];
for (const node of nodes) {
if (node.type === 'Comment' && !preserve_comments) {
continue;
}
if (
node.type === 'ConstTag' ||
node.type === 'DebugTag' ||
node.type === 'SvelteBody' ||
node.type === 'SvelteWindow' ||
node.type === 'SvelteDocument' ||
node.type === 'SvelteHead' ||
node.type === 'TitleElement' ||
node.type === 'SnippetBlock'
) {
// TODO others?
hoisted.push(node);
} else {
regular.push(node);
}
}
if (preserve_whitespace) {
return { hoisted, trimmed: regular };
}
let first, last;
while ((first = regular[0]) && first.type === 'Text' && !regex_not_whitespace.test(first.data)) {
regular.shift();
}
if (first?.type === 'Text') {
first.raw = first.raw.replace(regex_starts_with_whitespaces, '');
first.data = first.data.replace(regex_starts_with_whitespaces, '');
}
while ((last = regular.at(-1)) && last.type === 'Text' && !regex_not_whitespace.test(last.data)) {
regular.pop();
}
if (last?.type === 'Text') {
last.raw = last.raw.replace(regex_ends_with_whitespaces, '');
last.data = last.data.replace(regex_ends_with_whitespaces, '');
}
const can_remove_entirely =
(namespace === 'svg' &&
(parent.type !== 'RegularElement' || parent.name !== 'text') &&
!path.some((n) => n.type === 'RegularElement' && n.name === 'text')) ||
(parent.type === 'RegularElement' &&
// TODO others?
(parent.name === 'select' ||
parent.name === 'tr' ||
parent.name === 'table' ||
parent.name === 'tbody' ||
parent.name === 'thead' ||
parent.name === 'tfoot' ||
parent.name === 'colgroup' ||
parent.name === 'datalist'));
/** @type {import('#compiler').SvelteNode[]} */
const trimmed = [];
// Replace any whitespace between a text and non-text node with a single spaceand keep whitespace
// as-is within text nodes, or between text nodes and expression tags (because in the end they count
// as one text). This way whitespace is mostly preserved when using CSS with `white-space: pre-line`
// and default slot content going into a pre tag (which we can't see).
for (let i = 0; i < regular.length; i++) {
const prev = regular[i - 1];
const node = regular[i];
const next = regular[i + 1];
if (node.type === 'Text') {
if (prev?.type !== 'ExpressionTag') {
const prev_is_text_ending_with_whitespace =
prev?.type === 'Text' && regex_ends_with_whitespaces.test(prev.data);
node.data = node.data.replace(
regex_starts_with_whitespaces,
prev_is_text_ending_with_whitespace ? '' : ' '
);
node.raw = node.raw.replace(
regex_starts_with_whitespaces,
prev_is_text_ending_with_whitespace ? '' : ' '
);
}
if (next?.type !== 'ExpressionTag') {
node.data = node.data.replace(regex_ends_with_whitespaces, ' ');
node.raw = node.raw.replace(regex_ends_with_whitespaces, ' ');
}
if (node.data && (node.data !== ' ' || !can_remove_entirely)) {
trimmed.push(node);
}
} else {
trimmed.push(node);
}
}
return { hoisted, trimmed };
}
/**
* Infers the namespace for the children of a node that should be used when creating the `$.template(...)`.
* @param {import('#compiler').Namespace} namespace
* @param {import('#compiler').SvelteNode} parent
* @param {import('#compiler').SvelteNode[]} nodes
*/
export function infer_namespace(namespace, parent, nodes) {
if (namespace !== 'foreign') {
if (parent.type === 'RegularElement' && parent.name === 'foreignObject') {
return 'html';
}
if (parent.type === 'RegularElement' || parent.type === 'SvelteElement') {
if (parent.metadata.svg) {
return 'svg';
}
return parent.metadata.mathml ? 'mathml' : 'html';
}
// Re-evaluate the namespace inside slot nodes that reset the namespace
if (
parent.type === 'Fragment' ||
parent.type === 'Root' ||
parent.type === 'Component' ||
parent.type === 'SvelteComponent' ||
parent.type === 'SvelteFragment' ||
parent.type === 'SnippetBlock'
) {
const new_namespace = check_nodes_for_namespace(nodes, 'keep');
if (new_namespace !== 'keep' && new_namespace !== 'maybe_html') {
return new_namespace;
}
}
}
return namespace;
}
/**
* Heuristic: Keep current namespace, unless we find a regular element,
* in which case we always want html, or we only find svg nodes,
* in which case we assume svg.
* @param {import('#compiler').SvelteNode[]} nodes
* @param {import('#compiler').Namespace | 'keep' | 'maybe_html'} namespace
*/
function check_nodes_for_namespace(nodes, namespace) {
/**
* @param {import('#compiler').SvelteElement | import('#compiler').RegularElement} node}
* @param {{stop: () => void}} context
*/
const RegularElement = (node, { stop }) => {
if (!node.metadata.svg && !node.metadata.mathml) {
namespace = 'html';
stop();
} else if (namespace === 'keep') {
namespace = node.metadata.svg ? 'svg' : 'mathml';
}
};
for (const node of nodes) {
walk(
node,
{},
{
_(node, { next }) {
if (
node.type === 'EachBlock' ||
node.type === 'IfBlock' ||
node.type === 'AwaitBlock' ||
node.type === 'Fragment' ||
node.type === 'KeyBlock' ||
node.type === 'RegularElement' ||
node.type === 'SvelteElement' ||
node.type === 'Text'
) {
next();
}
},
SvelteElement: RegularElement,
RegularElement,
Text(node) {
if (node.data.trim() !== '') {
namespace = 'maybe_html';
}
}
}
);
if (namespace === 'html') return namespace;
}
return namespace;
}
/**
* Determines the namespace the children of this node are in.
* @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} node
* @param {import('#compiler').Namespace} namespace
* @returns {import('#compiler').Namespace}
*/
export function determine_namespace_for_children(node, namespace) {
if (namespace === 'foreign') {
return namespace;
}
if (node.name === 'foreignObject') {
return 'html';
}
if (node.metadata.svg) {
return 'svg';
}
return node.metadata.mathml ? 'mathml' : 'html';
}
/**
* @template {import('./types.js').TransformState} T
* @param {import('estree').CallExpression} node
* @param {import('zimmerframe').Context<any, T>} context
*/
export function transform_inspect_rune(node, context) {
const { state, visit } = context;
const as_fn = state.options.generate === 'client';
if (!state.options.dev) return b.unary('void', b.literal(0));
if (node.callee.type === 'MemberExpression') {
const raw_inspect_args = /** @type {import('estree').CallExpression} */ (node.callee.object)
.arguments;
const inspect_args =
/** @type {Array<import('estree').Expression>} */
(raw_inspect_args.map((arg) => visit(arg)));
const with_arg = /** @type {import('estree').Expression} */ (visit(node.arguments[0]));
return b.call(
'$.inspect',
as_fn ? b.thunk(b.array(inspect_args)) : b.array(inspect_args),
with_arg
);
} else {
const arg = node.arguments.map(
(arg) => /** @type {import('estree').Expression} */ (visit(arg))
);
return b.call('$.inspect', as_fn ? b.thunk(b.array(arg)) : b.array(arg));
}
}
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