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/** @import { AST, Namespace } from '#compiler' */
/** @import { SourceLocation } from '#shared' */
/** @import { ComponentClientTransformState, ComponentContext } from '../types' */
import { TEMPLATE_FRAGMENT, TEMPLATE_USE_IMPORT_NODE } from '../../../../../constants.js';
import { dev } from '../../../../state.js';
import * as b from '../../../../utils/builders.js';
import { clean_nodes, infer_namespace } from '../../utils.js';
import { process_children } from './shared/fragment.js';
import { build_render_statement } from './shared/utils.js';
/**
* @param {AST.Fragment} node
* @param {ComponentContext} context
*/
export function Fragment(node, context) {
// Creates a new block which looks roughly like this:
// ```js
// // hoisted:
// const block_name = $.template(`...`);
//
// // for the main block:
// const id = block_name();
// // init stuff and possibly render effect
// $.append($$anchor, id);
// ```
// Adds the hoisted parts to `context.state.hoisted` and returns the statements of the main block.
const parent = context.path.at(-1) ?? node;
const namespace = infer_namespace(context.state.metadata.namespace, parent, node.nodes);
const { hoisted, trimmed, is_standalone, is_text_first } = clean_nodes(
parent,
node.nodes,
context.path,
namespace,
context.state,
context.state.preserve_whitespace,
context.state.options.preserveComments
);
if (hoisted.length === 0 && trimmed.length === 0) {
return b.block([]);
}
const is_single_element = trimmed.length === 1 && trimmed[0].type === 'RegularElement';
const is_single_child_not_needing_template =
trimmed.length === 1 &&
(trimmed[0].type === 'SvelteFragment' || trimmed[0].type === 'TitleElement');
const template_name = context.state.scope.root.unique('root'); // TODO infer name from parent
/** @type {Statement[]} */
const body = [];
/** @type {Statement | undefined} */
let close = undefined;
/** @type {ComponentClientTransformState} */
const state = {
...context.state,
before_init: [],
init: [],
update: [],
after_update: [],
template: [],
locations: [],
transform: { ...context.state.transform },
metadata: {
context: {
template_needs_import_node: false,
template_contains_script_tag: false
},
namespace,
bound_contenteditable: context.state.metadata.bound_contenteditable
}
};
for (const node of hoisted) {
context.visit(node, state);
}
if (is_text_first) {
// skip over inserted comment
body.push(b.stmt(b.call('$.next')));
}
/**
* @param {Identifier} template_name
* @param {Expression[]} args
*/
const add_template = (template_name, args) => {
let call = b.call(get_template_function(namespace, state), ...args);
if (dev) {
call = b.call(
'$.add_locations',
call,
b.member(b.id(context.state.analysis.name), '$.FILENAME', true),
build_locations(state.locations)
);
}
context.state.hoisted.push(b.var(template_name, call));
};
if (is_single_element) {
const element = /** @type {AST.RegularElement} */ (trimmed[0]);
const id = b.id(context.state.scope.generate(element.name));
context.visit(element, {
...state,
node: id
});
/** @type {Expression[]} */
const args = [b.template([b.quasi(state.template.join(''), true)], [])];
if (state.metadata.context.template_needs_import_node) {
args.push(b.literal(TEMPLATE_USE_IMPORT_NODE));
}
add_template(template_name, args);
body.push(b.var(id, b.call(template_name)), ...state.before_init, ...state.init);
close = b.stmt(b.call('$.append', b.id('$$anchor'), id));
} else if (is_single_child_not_needing_template) {
context.visit(trimmed[0], state);
body.push(...state.before_init, ...state.init);
} else if (trimmed.length === 1 && trimmed[0].type === 'Text') {
const id = b.id(context.state.scope.generate('text'));
body.push(
b.var(id, b.call('$.text', b.literal(trimmed[0].data))),
...state.before_init,
...state.init
);
close = b.stmt(b.call('$.append', b.id('$$anchor'), id));
} else if (trimmed.length > 0) {
const id = b.id(context.state.scope.generate('fragment'));
const use_space_template =
trimmed.some((node) => node.type === 'ExpressionTag') &&
trimmed.every((node) => node.type === 'Text' || node.type === 'ExpressionTag');
if (use_space_template) {
// special case — we can use `$.text` instead of creating a unique template
const id = b.id(context.state.scope.generate('text'));
process_children(trimmed, () => id, false, {
...context,
state
});
body.push(b.var(id, b.call('$.text')), ...state.before_init, ...state.init);
close = b.stmt(b.call('$.append', b.id('$$anchor'), id));
} else {
if (is_standalone) {
// no need to create a template, we can just use the existing block's anchor
process_children(trimmed, () => b.id('$$anchor'), false, { ...context, state });
} else {
/** @type {(is_text: boolean) => Expression} */
const expression = (is_text) => b.call('$.first_child', id, is_text && b.true);
process_children(trimmed, expression, false, { ...context, state });
let flags = TEMPLATE_FRAGMENT;
if (state.metadata.context.template_needs_import_node) {
flags |= TEMPLATE_USE_IMPORT_NODE;
}
if (state.template.length === 1 && state.template[0] === '<!>') {
// special case — we can use `$.comment` instead of creating a unique template
body.push(b.var(id, b.call('$.comment')));
} else {
add_template(template_name, [
b.template([b.quasi(state.template.join(''), true)], []),
b.literal(flags)
]);
body.push(b.var(id, b.call(template_name)));
}
close = b.stmt(b.call('$.append', b.id('$$anchor'), id));
}
body.push(...state.before_init, ...state.init);
}
} else {
body.push(...state.before_init, ...state.init);
}
if (state.update.length > 0) {
body.push(build_render_statement(state.update));
}
body.push(...state.after_update);
if (close !== undefined) {
// It's important that close is the last statement in the block, as any previous statements
// could contain element insertions into the template, which the close statement needs to
// know of when constructing the list of current inner elements.
body.push(close);
}
return b.block(body);
}
/**
*
* @param {Namespace} namespace
* @param {ComponentClientTransformState} state
* @returns
*/
function get_template_function(namespace, state) {
const contains_script_tag = state.metadata.context.template_contains_script_tag;
return namespace === 'svg'
? contains_script_tag
? '$.svg_template_with_script'
: '$.ns_template'
: namespace === 'mathml'
? '$.mathml_template'
: contains_script_tag
? '$.template_with_script'
: '$.template';
}
/**
* @param {SourceLocation[]} locations
*/
function build_locations(locations) {
return b.array(
locations.map((loc) => {
const expression = b.array([b.literal(loc[0]), b.literal(loc[1])]);
if (loc.length === 3) {
expression.elements.push(build_locations(loc[2]));
}
return expression;
})
);
}
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