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Some elements may have attributes on them that require the * their output to be the child content instead. In this case, an object is returned. * @param {AST.RegularElement | AST.SvelteElement} node * @param {import('zimmerframe').Context<SvelteNode, ComponentServerTransformState>} context */ export function build_element_attributes(node, context) { /** @type {Array<AST.Attribute | AST.SpreadAttribute>} */ const attributes = []; /** @type {AST.ClassDirective[]} */ const class_directives = []; /** @type {AST.StyleDirective[]} */ const style_directives = []; /** @type {Expression | null} */ let content = null; let has_spread = false; // Use the index to keep the attributes order which is important for spreading let class_index = -1; let style_index = -1; let events_to_capture = new Set(); for (const attribute of node.attributes) { if (attribute.type === 'Attribute') { if (attribute.name === 'value') { if (node.name === 'textarea') { if ( attribute.value !== true && Array.isArray(attribute.value) && attribute.value[0].type === 'Text' && regex_starts_with_newline.test(attribute.value[0].data) ) { // Two or more leading newlines are required to restore the leading newline immediately after `<textarea>`. // see https://html.spec.whatwg.org/multipage/syntax.html#element-restrictions // also see related code in analysis phase attribute.value[0].data = '\n' + attribute.value[0].data; } content = b.call('$.escape', build_attribute_value(attribute.value, context)); } else if (node.name !== 'select') { // omit value attribute for select elements, it's irrelevant for the initially selected value and has no // effect on the selected value after the user interacts with the select element (the value _property_ does, but not the attribute) attributes.push(attribute); } // omit event handlers except for special cases } else if (is_event_attribute(attribute)) { if ( (attribute.name === 'onload' || attribute.name === 'onerror') && is_load_error_element(node.name) ) { events_to_capture.add(attribute.name); } } else { if (attribute.name === 'class') { class_index = attributes.length; } else if (attribute.name === 'style') { style_index = attributes.length; } attributes.push(attribute); } } else if (attribute.type === 'BindDirective') { if (attribute.name === 'value' && node.name === 'select') continue; if ( attribute.name === 'value' && attributes.some( (attr) => attr.type === 'Attribute' && attr.name === 'type' && is_text_attribute(attr) && attr.value[0].data === 'file' ) ) { continue; } if (attribute.name === 'this') continue; const binding = binding_properties[attribute.name]; if (binding?.omit_in_ssr) continue; if (is_content_editable_binding(attribute.name)) { content = /** @type {Expression} */ (context.visit(attribute.expression)); } else if (attribute.name === 'value' && node.name === 'textarea') { content = b.call( '$.escape', /** @type {Expression} */ (context.visit(attribute.expression)) ); } else if (attribute.name === 'group') { const value_attribute = /** @type {AST.Attribute | undefined} */ ( node.attributes.find((attr) => attr.type === 'Attribute' && attr.name === 'value') ); if (!value_attribute) continue; const is_checkbox = node.attributes.some( (attr) => attr.type === 'Attribute' && attr.name === 'type' && is_text_attribute(attr) && attr.value[0].data === 'checkbox' ); attributes.push( create_attribute('checked', -1, -1, [ { type: 'ExpressionTag', start: -1, end: -1, parent: attribute, expression: is_checkbox ? b.call( b.member(attribute.expression, 'includes'), build_attribute_value(value_attribute.value, context) ) : b.binary( '===', attribute.expression, build_attribute_value(value_attribute.value, context) ), metadata: { expression: create_expression_metadata() } } ]) ); } else { attributes.push( create_attribute(attribute.name, -1, -1, [ { type: 'ExpressionTag', start: -1, end: -1, parent: attribute, expression: attribute.expression, metadata: { expression: create_expression_metadata() } } ]) ); } } else if (attribute.type === 'SpreadAttribute') { attributes.push(attribute); has_spread = true; if (is_load_error_element(node.name)) { events_to_capture.add('onload'); events_to_capture.add('onerror'); } } else if (attribute.type === 'UseDirective') { if (is_load_error_element(node.name)) { events_to_capture.add('onload'); events_to_capture.add('onerror'); } } else if (attribute.type === 'ClassDirective') { class_directives.push(attribute); } else if (attribute.type === 'StyleDirective') { style_directives.push(attribute); } else if (attribute.type === 'LetDirective') { // do nothing, these are handled inside `build_inline_component` } else { context.visit(attribute); } } if (class_directives.length > 0 && !has_spread) { const class_attribute = build_class_directives( class_directives, /** @type {AST.Attribute | null} */ (attributes[class_index] ?? null) ); if (class_index === -1) { attributes.push(class_attribute); } } if (style_directives.length > 0 && !has_spread) { build_style_directives( style_directives, /** @type {AST.Attribute | null} */ (attributes[style_index] ?? null), context ); if (style_index > -1) { attributes.splice(style_index, 1); } } if (has_spread) { build_element_spread_attributes(node, attributes, style_directives, class_directives, context); } else { for (const attribute of /** @type {AST.Attribute[]} */ (attributes)) { if (attribute.value === true || is_text_attribute(attribute)) { const name = get_attribute_name(node, attribute); const literal_value = /** @type {Literal} */ ( build_attribute_value( attribute.value, context, WHITESPACE_INSENSITIVE_ATTRIBUTES.includes(name) ) ).value; if (name !== 'class' || literal_value) { context.state.template.push( b.literal( ` ${attribute.name}${ is_boolean_attribute(name) && literal_value === true ? '' : `="${literal_value === true ? '' : String(literal_value)}"` }` ) ); } continue; } const name = get_attribute_name(node, attribute); const value = build_attribute_value( attribute.value, context, WHITESPACE_INSENSITIVE_ATTRIBUTES.includes(name) ); context.state.template.push( b.call('$.attr', b.literal(name), value, is_boolean_attribute(name) && b.true) ); } } if (events_to_capture.size !== 0) { for (const event of events_to_capture) { context.state.template.push(b.literal(` ${event}="this.__e=event"`)); } } return content; } /** * @param {AST.RegularElement | AST.SvelteElement} element * @param {AST.Attribute} attribute */ function get_attribute_name(element, attribute) { let name = attribute.name; if (!element.metadata.svg && !element.metadata.mathml) { name = name.toLowerCase(); // don't lookup boolean aliases here, the server runtime function does only // check for the lowercase variants of boolean attributes } return name; } /** * * @param {AST.RegularElement | AST.SvelteElement} element * @param {Array<AST.Attribute | AST.SpreadAttribute>} attributes * @param {AST.StyleDirective[]} style_directives * @param {AST.ClassDirective[]} class_directives * @param {ComponentContext} context */ function build_element_spread_attributes( element, attributes, style_directives, class_directives, context ) { let classes; let styles; let flags = 0; if (class_directives.length > 0 || context.state.analysis.css.hash) { const properties = class_directives.map((directive) => b.init( directive.name, directive.expression.type === 'Identifier' && directive.expression.name === directive.name ? b.id(directive.name) : /** @type {Expression} */ (context.visit(directive.expression)) ) ); if (context.state.analysis.css.hash) { properties.unshift(b.init(context.state.analysis.css.hash, b.literal(true))); } classes = b.object(properties); } if (style_directives.length > 0) { const properties = style_directives.map((directive) => b.init( directive.name, directive.value === true ? b.id(directive.name) : build_attribute_value(directive.value, context, true) ) ); styles = b.object(properties); } if (element.metadata.svg || element.metadata.mathml) { flags |= ELEMENT_IS_NAMESPACED | ELEMENT_PRESERVE_ATTRIBUTE_CASE; } else if (is_custom_element_node(element)) { flags |= ELEMENT_PRESERVE_ATTRIBUTE_CASE; } const object = b.object( attributes.map((attribute) => { if (attribute.type === 'Attribute') { const name = get_attribute_name(element, attribute); const value = build_attribute_value( attribute.value, context, WHITESPACE_INSENSITIVE_ATTRIBUTES.includes(name) ); return b.prop('init', b.key(name), value); } return b.spread(/** @type {Expression} */ (context.visit(attribute))); }) ); const args = [object, classes, styles, flags ? b.literal(flags) : undefined]; context.state.template.push(b.call('$.spread_attributes', ...args)); } /** * * @param {AST.ClassDirective[]} class_directives * @param {AST.Attribute | null} class_attribute * @returns */ function build_class_directives(class_directives, class_attribute) { const expressions = class_directives.map((directive) => b.conditional(directive.expression, b.literal(directive.name), b.literal('')) ); if (class_attribute === null) { class_attribute = create_attribute('class', -1, -1, []); } const chunks = get_attribute_chunks(class_attribute.value); const last = chunks.at(-1); if (last?.type === 'Text') { last.data += ' '; last.raw += ' '; } else if (last) { chunks.push({ type: 'Text', start: -1, end: -1, parent: class_attribute, data: ' ', raw: ' ' }); } chunks.push({ type: 'ExpressionTag', start: -1, end: -1, parent: class_attribute, expression: b.call( b.member(b.call(b.member(b.array(expressions), 'filter'), b.id('Boolean')), b.id('join')), b.literal(' ') ), metadata: { expression: create_expression_metadata() } }); class_attribute.value = chunks; return class_attribute; } /** * @param {AST.StyleDirective[]} style_directives * @param {AST.Attribute | null} style_attribute * @param {ComponentContext} context */ function build_style_directives(style_directives, style_attribute, context) { const styles = style_directives.map((directive) => { let value = directive.value === true ? b.id(directive.name) : build_attribute_value(directive.value, context, true); if (directive.modifiers.includes('important')) { value = b.binary('+', value, b.literal(' !important')); } return b.init(directive.name, value); }); const arg = style_attribute === null ? b.object(styles) : b.call( '$.merge_styles', build_attribute_value(style_attribute.value, context, true), b.object(styles) ); context.state.template.push(b.call('$.add_styles', arg)); } |