Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 159x 159x 3856x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 4016x 222x 222x 3856x 4016x 205x 205x 205x 3856x 3856x 3856x 3856x 3856x 3856x 2512x 2512x 86x 86x 86x 86x 86x 86x 86x 2512x 2512x 3856x 3856x 4016x 1636x 1636x 1636x 1636x 1636x 1636x 1636x 1636x 1636x 1636x 1636x 1636x 1636x 5x 5x 1636x 1636x 1636x 1636x 1636x 4016x 31x 31x 2220x 139x 139x 139x 139x 139x 139x 139x 2189x 2028x 2028x 2028x 2028x 2028x 2028x 2028x 158x 158x 158x 158x 158x 158x 158x 158x 158x 158x 2028x 1870x 360x 360x 1870x 1510x 1510x 1510x 1510x 1510x 1510x 1510x 1510x 4x 4x 1509x 1510x 633x 633x 1509x 876x 876x 876x 876x 876x 876x 876x 1509x 1509x 1509x 1869x 1869x 1869x 2050x 22x 22x 3855x 4014x 1279x 1279x 3855x 3855x 3855x 4000x 3442x 3442x 3442x 3442x 3442x 3855x 3855x 3855x 2x 2x 2x 2x 2x 2x 2x 2512x 2512x 2512x 2512x 44x 44x 2512x 2468x 2468x 2463x 2512x 2512x 2x 2x 2x 2x 87x 87x 87x 107x 107x 107x 1x 1x 107x 107x 87x 87x 87x | /** @import { Expression, Identifier, Statement } from 'estree' */
/** @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;
})
);
}
|