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import Attribute from '../../../nodes/Attribute';
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import Block from '../../Block';
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import fix_attribute_casing from './fix_attribute_casing';
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import ElementWrapper from './index';
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import { string_literal } from '../../../utils/stringify';
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import { b, x } from 'code-red';
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import Expression from '../../../nodes/shared/Expression';
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import Text from '../../../nodes/Text';
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import handle_select_value_binding from './handle_select_value_binding';
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import { Identifier, Node } from 'estree';
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import { namespaces, valid_namespaces } from '../../../../utils/namespaces';
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export class BaseAttributeWrapper {
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node: Attribute;
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parent: ElementWrapper;
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constructor(parent: ElementWrapper, block: Block, node: Attribute) {
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this.node = node;
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this.parent = parent;
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if (node.dependencies.size > 0) {
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parent.cannot_use_innerhtml();
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parent.not_static_content();
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block.add_dependencies(node.dependencies);
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}
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}
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render(_block: Block) {}
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}
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export default class AttributeWrapper extends BaseAttributeWrapper {
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node: Attribute;
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parent: ElementWrapper;
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metadata: any;
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name: string;
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property_name: string;
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is_indirectly_bound_value: boolean;
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is_src: boolean;
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is_select_value_attribute: boolean;
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is_input_value: boolean;
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should_cache: boolean;
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last: Identifier;
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constructor(parent: ElementWrapper, block: Block, node: Attribute) {
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super(parent, block, node);
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if (node.dependencies.size > 0) {
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// special case — <option value={foo}> — see below
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if (this.parent.node.name === 'option' && node.name === 'value') {
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let select: ElementWrapper = this.parent;
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while (select && (select.node.type !== 'Element' || select.node.name !== 'select'))
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// @ts-ignore todo: doublecheck this, but looks to be correct
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select = select.parent;
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if (select && select.select_binding_dependencies) {
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select.select_binding_dependencies.forEach(prop => {
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this.node.dependencies.forEach((dependency: string) => {
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this.parent.renderer.component.indirect_dependencies.get(prop).add(dependency);
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});
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});
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}
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}
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if (node.name === 'value') {
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handle_select_value_binding(this, node.dependencies);
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}
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}
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const namespace = this.parent.node.namespace;
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// some processing only applies to html namespace (and not MathML, SVG, or Svelte Native etc)
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if (namespace && namespace != 'html' && namespace != namespaces.html) {
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// attributes outside of the html namespace may be case sensitive
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// namespaces for which we don't have case corrections, are left in their original case (required for svelte-native)
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this.name = (valid_namespaces.indexOf(namespace) >= 0) ? fix_attribute_casing(this.node.name) : this.node.name;
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this.is_indirectly_bound_value = false;
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this.metadata = null;
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this.property_name = null;
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this.is_select_value_attribute = false;
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this.is_input_value = false;
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} else {
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this.name = fix_attribute_casing(this.node.name);
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this.metadata = this.get_metadata();
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this.is_indirectly_bound_value = is_indirectly_bound_value(this);
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this.property_name = this.is_indirectly_bound_value
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? '__value'
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: this.metadata && this.metadata.property_name;
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this.is_select_value_attribute = this.name === 'value' && this.parent.node.name === 'select';
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this.is_input_value = this.name === 'value' && this.parent.node.name === 'input';
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}
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this.is_src = this.name === 'src'; // TODO retire this exception in favour of https://github.com/sveltejs/svelte/issues/3750
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this.should_cache = should_cache(this);
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}
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render(block: Block) {
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const element = this.parent;
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const { name, property_name, should_cache, is_indirectly_bound_value } = this;
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// xlink is a special case... we could maybe extend this to generic
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// namespaced attributes but I'm not sure that's applicable in
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// HTML5?
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const method = /-/.test(element.node.name)
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? '@set_custom_element_data'
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: name.slice(0, 6) === 'xlink:'
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? '@xlink_attr'
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: '@attr';
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const is_legacy_input_type = element.renderer.component.compile_options.legacy && name === 'type' && this.parent.node.name === 'input';
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const dependencies = this.get_dependencies();
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const value = this.get_value(block);
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let updater;
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const init = this.get_init(block, value);
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if (is_legacy_input_type) {
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block.chunks.hydrate.push(
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b`@set_input_type(${element.var}, ${init});`
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);
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updater = b`@set_input_type(${element.var}, ${should_cache ? this.last : value});`;
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} else if (this.is_select_value_attribute) {
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// annoying special case
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const is_multiple_select = element.node.get_static_attribute_value('multiple');
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if (is_multiple_select) {
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updater = b`@select_options(${element.var}, ${value});`;
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} else {
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updater = b`@select_option(${element.var}, ${value});`;
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}
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block.chunks.mount.push(b`
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${updater}
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`);
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} else if (this.is_src) {
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block.chunks.hydrate.push(
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b`if (${element.var}.src !== ${init}) ${method}(${element.var}, "${name}", ${this.last});`
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);
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updater = b`${method}(${element.var}, "${name}", ${should_cache ? this.last : value});`;
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} else if (property_name) {
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block.chunks.hydrate.push(
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b`${element.var}.${property_name} = ${init};`
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);
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updater = block.renderer.options.dev
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? b`@prop_dev(${element.var}, "${property_name}", ${should_cache ? this.last : value});`
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: b`${element.var}.${property_name} = ${should_cache ? this.last : value};`;
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} else {
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block.chunks.hydrate.push(
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b`${method}(${element.var}, "${name}", ${init});`
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);
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updater = b`${method}(${element.var}, "${name}", ${should_cache ? this.last : value});`;
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}
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if (is_indirectly_bound_value) {
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const update_value = b`${element.var}.value = ${element.var}.__value;`;
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block.chunks.hydrate.push(update_value);
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updater = b`
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${updater}
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${update_value};
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`;
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}
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if (dependencies.length > 0) {
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const condition = this.get_dom_update_conditions(block, block.renderer.dirty(dependencies));
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block.chunks.update.push(b`
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if (${condition}) {
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${updater}
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}`);
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}
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// special case – autofocus. has to be handled in a bit of a weird way
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if (this.node.is_true && name === 'autofocus') {
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block.autofocus = element.var;
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}
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}
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get_init(block: Block, value) {
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this.last = this.should_cache && block.get_unique_name(
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`${this.parent.var.name}_${this.name.replace(/[^a-zA-Z_$]/g, '_')}_value`
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);
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if (this.should_cache) block.add_variable(this.last);
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return this.should_cache ? x`${this.last} = ${value}` : value;
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}
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get_dom_update_conditions(block: Block, dependency_condition: Node) {
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const { property_name, should_cache, last } = this;
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const element = this.parent;
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const value = this.get_value(block);
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let condition = dependency_condition;
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if (should_cache) {
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condition = this.is_src
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? x`${condition} && (${element.var}.src !== (${last} = ${value}))`
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: x`${condition} && (${last} !== (${last} = ${value}))`;
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}
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if (this.is_input_value) {
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const type = element.node.get_static_attribute_value('type');
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if (type === null || type === '' || type === 'text' || type === 'email' || type === 'password') {
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condition = x`${condition} && ${element.var}.${property_name} !== ${should_cache ? last : value}`;
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}
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}
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if (block.has_outros) {
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condition = x`!#current || ${condition}`;
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}
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return condition;
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}
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get_dependencies() {
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const node_dependencies = this.node.get_dependencies();
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const dependencies = new Set(node_dependencies);
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node_dependencies.forEach((prop: string) => {
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const indirect_dependencies = this.parent.renderer.component.indirect_dependencies.get(prop);
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if (indirect_dependencies) {
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indirect_dependencies.forEach(indirect_dependency => {
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dependencies.add(indirect_dependency);
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});
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}
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});
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return Array.from(dependencies);
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}
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get_metadata() {
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if (this.parent.node.namespace) return null;
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const metadata = attribute_lookup[this.name];
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if (metadata && metadata.applies_to && !metadata.applies_to.includes(this.parent.node.name)) return null;
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return metadata;
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}
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get_value(block) {
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if (this.node.is_true) {
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if (this.metadata && boolean_attribute.has(this.metadata.property_name.toLowerCase())) {
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return x`true`;
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}
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return x`""`;
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}
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if (this.node.chunks.length === 0) return x`""`;
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// TODO some of this code is repeated in Tag.ts — would be good to
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// DRY it out if that's possible without introducing crazy indirection
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if (this.node.chunks.length === 1) {
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return this.node.chunks[0].type === 'Text'
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? string_literal((this.node.chunks[0] as Text).data)
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: (this.node.chunks[0] as Expression).manipulate(block);
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}
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let value = this.node.name === 'class'
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? this.get_class_name_text(block)
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: this.render_chunks(block).reduce((lhs, rhs) => x`${lhs} + ${rhs}`);
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// '{foo} {bar}' — treat as string concatenation
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if (this.node.chunks[0].type !== 'Text') {
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value = x`"" + ${value}`;
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}
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return value;
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}
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get_class_name_text(block) {
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const scoped_css = this.node.chunks.some((chunk: Text) => chunk.synthetic);
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const rendered = this.render_chunks(block);
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if (scoped_css && rendered.length === 2) {
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// we have a situation like class={possiblyUndefined}
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rendered[0] = x`@null_to_empty(${rendered[0]})`;
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}
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return rendered.reduce((lhs, rhs) => x`${lhs} + ${rhs}`);
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}
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render_chunks(block: Block) {
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return this.node.chunks.map((chunk) => {
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if (chunk.type === 'Text') {
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return string_literal(chunk.data);
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}
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return chunk.manipulate(block);
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});
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}
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stringify() {
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if (this.node.is_true) return '';
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const value = this.node.chunks;
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if (value.length === 0) return '=""';
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return `="${value.map(chunk => {
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return chunk.type === 'Text'
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? chunk.data.replace(/"/g, '\\"')
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: `\${${chunk.manipulate()}}`;
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}).join('')}"`;
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}
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}
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// source: https://html.spec.whatwg.org/multipage/indices.html
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const attribute_lookup = {
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allowfullscreen: { property_name: 'allowFullscreen', applies_to: ['iframe'] },
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allowpaymentrequest: { property_name: 'allowPaymentRequest', applies_to: ['iframe'] },
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async: { applies_to: ['script'] },
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autofocus: { applies_to: ['button', 'input', 'keygen', 'select', 'textarea'] },
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autoplay: { applies_to: ['audio', 'video'] },
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checked: { applies_to: ['input'] },
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controls: { applies_to: ['audio', 'video'] },
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default: { applies_to: ['track'] },
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defer: { applies_to: ['script'] },
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disabled: {
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applies_to: [
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'button',
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'fieldset',
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'input',
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'keygen',
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'optgroup',
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'option',
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'select',
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'textarea'
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]
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},
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formnovalidate: { property_name: 'formNoValidate', applies_to: ['button', 'input'] },
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hidden: {},
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indeterminate: { applies_to: ['input'] },
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ismap: { property_name: 'isMap', applies_to: ['img'] },
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loop: { applies_to: ['audio', 'bgsound', 'video'] },
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multiple: { applies_to: ['input', 'select'] },
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muted: { applies_to: ['audio', 'video'] },
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nomodule: { property_name: 'noModule', applies_to: ['script'] },
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novalidate: { property_name: 'noValidate', applies_to: ['form'] },
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open: { applies_to: ['details', 'dialog'] },
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playsinline: { property_name: 'playsInline', applies_to: ['video'] },
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readonly: { property_name: 'readOnly', applies_to: ['input', 'textarea'] },
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required: { applies_to: ['input', 'select', 'textarea'] },
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reversed: { applies_to: ['ol'] },
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selected: { applies_to: ['option'] },
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value: {
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applies_to: [
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'button',
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'option',
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'input',
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'li',
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'meter',
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'progress',
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'param',
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'select',
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'textarea'
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]
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}
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};
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Object.keys(attribute_lookup).forEach(name => {
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const metadata = attribute_lookup[name];
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if (!metadata.property_name) metadata.property_name = name;
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});
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// source: https://html.spec.whatwg.org/multipage/indices.html
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const boolean_attribute = new Set([
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'allowfullscreen',
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'allowpaymentrequest',
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'async',
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'autofocus',
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'autoplay',
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'checked',
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'controls',
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'default',
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'defer',
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'disabled',
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'formnovalidate',
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'hidden',
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'ismap',
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'itemscope',
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'loop',
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'multiple',
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'muted',
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'nomodule',
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'novalidate',
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'open',
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'playsinline',
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'readonly',
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'required',
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'reversed',
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'selected'
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]);
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function should_cache(attribute: AttributeWrapper) {
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return attribute.is_src || attribute.node.should_cache();
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}
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function is_indirectly_bound_value(attribute: AttributeWrapper) {
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const element = attribute.parent;
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return attribute.name === 'value' &&
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(element.node.name === 'option' || // TODO check it's actually bound
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(element.node.name === 'input' &&
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element.node.bindings.some(
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(binding) =>
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/checked|group/.test(binding.name)
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)));
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} |
