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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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export default class AttributeWrapper {
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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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// 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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}
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}
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is_indirectly_bound_value() {
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const element = this.parent;
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const name = fix_attribute_casing(this.node.name);
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return (
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name === 'value' &&
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(element.node.name === 'option' || // TODO check it's actually bound
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(element.node.name === 'input' && element.node.bindings.some((binding) => /checked|group/.test(binding.name))))
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);
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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 = fix_attribute_casing(this.node.name);
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const metadata = this.get_metadata();
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const is_indirectly_bound_value = this.is_indirectly_bound_value();
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const property_name = is_indirectly_bound_value ? '__value' : metadata && metadata.property_name;
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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 dependencies = this.node.get_dependencies();
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const value = this.get_value(block);
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const is_src = this.node.name === 'src'; // TODO retire this exception in favour of https://github.com/sveltejs/svelte/issues/3750
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const is_select_value_attribute = name === 'value' && element.node.name === 'select';
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const is_input_value = name === 'value' && element.node.name === 'input';
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const should_cache = is_src || this.node.should_cache() || is_select_value_attribute; // TODO is this necessary?
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const last =
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should_cache && block.get_unique_name(`${element.var.name}_${name.replace(/[^a-zA-Z_$]/g, '_')}_value`);
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if (should_cache) block.add_variable(last);
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let updater;
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const init = should_cache ? x`${last} = ${value}` : value;
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if (is_select_value_attribute) {
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// annoying special case
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const is_multiple_select = element.node.get_static_attribute_value('multiple');
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const i = block.get_unique_name('i');
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const option = block.get_unique_name('option');
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const if_statement = is_multiple_select
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? b`
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${option}.selected = ~${last}.indexOf(${option}.__value);`
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: b`
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if (${option}.__value === ${last}) {
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${option}.selected = true;
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${{ type: 'BreakStatement' }};
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}`; // TODO the BreakStatement is gross, but it's unsyntactic otherwise...
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updater = b`
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for (var ${i} = 0; ${i} < ${element.var}.options.length; ${i} += 1) {
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var ${option} = ${element.var}.options[${i}];
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${if_statement}
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}
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`;
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block.chunks.mount.push(b`
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${last} = ${value};
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${updater}
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`);
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} else if (is_src) {
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block.chunks.hydrate.push(b`if (${element.var}.src !== ${init}) ${method}(${element.var}, "${name}", ${last});`);
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updater = b`${method}(${element.var}, "${name}", ${should_cache ? last : value});`;
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} else if (property_name) {
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block.chunks.hydrate.push(b`${element.var}.${property_name} = ${init};`);
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updater = block.renderer.options.dev
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? b`@prop_dev(${element.var}, "${property_name}", ${should_cache ? last : value});`
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: b`${element.var}.${property_name} = ${should_cache ? last : value};`;
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} else {
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block.chunks.hydrate.push(b`${method}(${element.var}, "${name}", ${init});`);
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updater = b`${method}(${element.var}, "${name}", ${should_cache ? last : value});`;
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}
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if (dependencies.length > 0) {
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let condition = block.renderer.dirty(dependencies);
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if (should_cache) {
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condition = is_src
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? x`${condition} && (${element.var}.src !== (${last} = ${value}))`
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: x`${condition} && (${last} !== (${last} = ${value}))`;
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}
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if (is_input_value) {
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const type = element.node.get_static_attribute_value('type');
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if (type === null || type === '' || type === 'text' || type === 'email' || type === 'password') {
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condition = x`${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 || ${condition}`;
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}
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block.chunks.update.push(b`
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if (${condition}) {
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${updater}
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}`);
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}
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// special case – autofocus. has to be handled in a bit of a weird way
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if (this.node.is_true && name === 'autofocus') {
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block.autofocus = element.var;
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}
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if (is_indirectly_bound_value) {
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const update_value = b`${element.var}.value = ${element.var}.__value;`;
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block.chunks.hydrate.push(update_value);
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if (this.node.get_dependencies().length > 0) block.chunks.update.push(update_value);
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}
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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[fix_attribute_casing(this.node.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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const metadata = this.get_metadata();
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if (metadata && boolean_attribute.has(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 =
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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`"" + ${value}`;
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}
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return value;
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}
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get_class_name_text(block) {
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const scoped_css = this.node.chunks.some((chunk: Text) => chunk.synthetic);
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const rendered = this.render_chunks(block);
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if (scoped_css && rendered.length === 2) {
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// we have a situation like class={possiblyUndefined}
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rendered[0] = x`${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
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.map((chunk) => {
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return chunk.type === 'Text' ? chunk.data.replace(/"/g, '\\"') : `\${${chunk.manipulate()}}`;
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})
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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: ['button', 'fieldset', 'input', 'keygen', 'optgroup', 'option', 'select', 'textarea'],
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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: ['button', 'option', 'input', 'li', 'meter', 'progress', 'param', 'select', 'textarea'],
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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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