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 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 34x 13x 1x 1x 13x 34x 7x 17x 2x 14x 1x 12x 11x 3x 3x 11x 8x 8x 34x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 9x 8x 8x 9x 9x 67x 67x 67x 67x 8x 8x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 67x 2x 2x 2x 2x 2x 2x 2x 2x 2x 67x 67x 47x 3x 3x 3x 3x 47x 47x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 13x 13x 13x 13x 13x 13x 13x 13x 20x 7x 7x 20x 20x 20x 13x 20x 20x 20x 20x 20x 67x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 3x 3x 3x 6x 6x 6x 6x 11x 11x 11x 11x 11x 11x 11x 11x 64x 67x 67x 67x 67x 67x | /** @import { BlockStatement, Expression, ExpressionStatement, Identifier, Literal, MemberExpression, ObjectExpression, Statement } from 'estree' */
/** @import { Attribute, ClassDirective, SpreadAttribute, StyleDirective, SvelteElement } from '#compiler' */
/** @import { SourceLocation } from '#shared' */
/** @import { ComponentClientTransformState, ComponentContext } from '../types' */
/** @import { Scope } from '../../../scope' */
import { dev, locator } from '../../../../state.js';
import {
get_attribute_expression,
is_event_attribute,
is_text_attribute
} from '../../../../utils/ast.js';
import * as b from '../../../../utils/builders.js';
import { determine_namespace_for_children } from '../../utils.js';
import {
build_attribute_value,
build_class_directives,
build_style_directives
} from './shared/element.js';
import { build_render_statement, build_update } from './shared/utils.js';
/**
* @param {SvelteElement} node
* @param {ComponentContext} context
*/
export function SvelteElement(node, context) {
context.state.template.push(`<!>`);
/** @type {Array<Attribute | SpreadAttribute>} */
const attributes = [];
/** @type {Attribute['value'] | undefined} */
let dynamic_namespace = undefined;
/** @type {ClassDirective[]} */
const class_directives = [];
/** @type {StyleDirective[]} */
const style_directives = [];
/** @type {ExpressionStatement[]} */
const lets = [];
// Create a temporary context which picks up the init/update statements.
// They'll then be added to the function parameter of $.element
const element_id = b.id(context.state.scope.generate('$$element'));
/** @type {ComponentContext} */
const inner_context = {
...context,
state: {
...context.state,
node: element_id,
before_init: [],
init: [],
update: [],
after_update: []
}
};
for (const attribute of node.attributes) {
if (attribute.type === 'Attribute') {
if (attribute.name === 'xmlns' && !is_text_attribute(attribute)) {
dynamic_namespace = attribute.value;
}
attributes.push(attribute);
} else if (attribute.type === 'SpreadAttribute') {
attributes.push(attribute);
} else if (attribute.type === 'ClassDirective') {
class_directives.push(attribute);
} else if (attribute.type === 'StyleDirective') {
style_directives.push(attribute);
} else if (attribute.type === 'LetDirective') {
lets.push(/** @type {ExpressionStatement} */ (context.visit(attribute)));
} else if (attribute.type === 'OnDirective') {
const handler = /** @type {Expression} */ (context.visit(attribute, inner_context.state));
inner_context.state.after_update.push(b.stmt(handler));
} else {
context.visit(attribute, inner_context.state);
}
}
// Let bindings first, they can be used on attributes
context.state.init.push(...lets); // create computeds in the outer context; the dynamic element is the single child of this slot
// Then do attributes
// Always use spread because we don't know whether the element is a custom element or not,
// therefore we need to do the "how to set an attribute" logic at runtime.
const is_attributes_reactive =
build_dynamic_element_attributes(attributes, inner_context, element_id) !== null;
// class/style directives must be applied last since they could override class/style attributes
build_class_directives(class_directives, element_id, inner_context, is_attributes_reactive);
build_style_directives(style_directives, element_id, inner_context, is_attributes_reactive, true);
const get_tag = b.thunk(/** @type {Expression} */ (context.visit(node.tag)));
if (dev) {
if (node.fragment.nodes.length > 0) {
context.state.init.push(b.stmt(b.call('$.validate_void_dynamic_element', get_tag)));
}
context.state.init.push(b.stmt(b.call('$.validate_dynamic_element_tag', get_tag)));
}
/** @type {Statement[]} */
const inner = inner_context.state.init;
if (inner_context.state.update.length > 0) {
inner.push(build_render_statement(inner_context.state.update));
}
inner.push(...inner_context.state.after_update);
inner.push(
.../** @type {BlockStatement} */ (
context.visit(node.fragment, {
...context.state,
metadata: {
...context.state.metadata,
namespace: determine_namespace_for_children(node, context.state.metadata.namespace)
}
})
).body
);
const location = dev && locator(node.start);
context.state.init.push(
b.stmt(
b.call(
'$.element',
context.state.node,
get_tag,
node.metadata.svg || node.metadata.mathml ? b.true : b.false,
inner.length > 0 && b.arrow([element_id, b.id('$$anchor')], b.block(inner)),
dynamic_namespace && b.thunk(build_attribute_value(dynamic_namespace, context).value),
location && b.array([b.literal(location.line), b.literal(location.column)])
)
)
);
}
/**
* Serializes dynamic element attribute assignments.
* Returns the `true` if spread is deemed reactive.
* @param {Array<Attribute | SpreadAttribute>} attributes
* @param {ComponentContext} context
* @param {Identifier} element_id
* @returns {boolean}
*/
function build_dynamic_element_attributes(attributes, context, element_id) {
if (attributes.length === 0) {
if (context.state.analysis.css.hash) {
context.state.init.push(
b.stmt(b.call('$.set_class', element_id, b.literal(context.state.analysis.css.hash)))
);
}
return false;
}
// TODO why are we always treating this as a spread? needs docs, if that's not an error
let needs_isolation = false;
let is_reactive = false;
/** @type {ObjectExpression['properties']} */
const values = [];
for (const attribute of attributes) {
if (attribute.type === 'Attribute') {
const { value } = build_attribute_value(attribute.value, context);
if (
is_event_attribute(attribute) &&
(get_attribute_expression(attribute).type === 'ArrowFunctionExpression' ||
get_attribute_expression(attribute).type === 'FunctionExpression')
) {
// Give the event handler a stable ID so it isn't removed and readded on every update
const id = context.state.scope.generate('event_handler');
context.state.init.push(b.var(id, value));
values.push(b.init(attribute.name, b.id(id)));
} else {
values.push(b.init(attribute.name, value));
}
} else {
values.push(b.spread(/** @type {Expression} */ (context.visit(attribute))));
}
is_reactive ||=
attribute.metadata.expression.has_state ||
// objects could contain reactive getters -> play it safe and always assume spread attributes are reactive
attribute.type === 'SpreadAttribute';
needs_isolation ||=
attribute.type === 'SpreadAttribute' && attribute.metadata.expression.has_call;
}
if (needs_isolation || is_reactive) {
const id = context.state.scope.generate('attributes');
context.state.init.push(b.let(id));
const update = b.stmt(
b.assignment(
'=',
b.id(id),
b.call(
'$.set_dynamic_element_attributes',
element_id,
b.id(id),
b.object(values),
context.state.analysis.css.hash !== '' && b.literal(context.state.analysis.css.hash)
)
)
);
if (needs_isolation) {
context.state.init.push(build_update(update));
return false;
}
context.state.update.push(update);
return true;
}
context.state.init.push(
b.stmt(
b.call(
'$.set_dynamic_element_attributes',
element_id,
b.literal(null),
b.object(values),
context.state.analysis.css.hash !== '' && b.literal(context.state.analysis.css.hash)
)
)
);
return false;
}
|