Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import * as b from '../../utils/builders.js'; import { walk } from 'zimmerframe'; import { extract_identifiers } from '../../utils/ast.js'; /** * @param {import('estree').Node} node * @returns {boolean} */ export function is_hoistable_function(node) { if ( node.type === 'ArrowFunctionExpression' || node.type === 'FunctionExpression' || node.type === 'FunctionDeclaration' ) { return node.metadata?.hoistable === true; } return false; } /** * @param {import("#compiler").SvelteNode[]} nodes */ function sort_const_tags(nodes) { // If we are in a legacy component, attempt to re-order any ConstTag template nodes // so that they're in topological order given their dependencies. const const_tags = []; const deps = new Set(); const tag_ids = new Map(); const other = []; for (const node of nodes) { if (node.type === 'ConstTag') { const ids = extract_identifiers(node.declaration.declarations[0].id); for (const id of ids) { deps.add(id.name); } tag_ids.set(node, ids); const_tags.push(node); } else { other.push(node); } } if (const_tags.length > 1) { let attempts = 0; const new_nodes = []; while (const_tags.length > 0) { // Worst case-scenario we prevent an infinite loop if (attempts > 100) { new_nodes.push(...const_tags); break; } attempts++; const_loop: for (let i = const_tags.length - 1; i >= 0; i--) { const node = const_tags[i]; const dependencies = node.metadata?.dependencies; if (dependencies) { for (const dep of dependencies) { if (deps.has(dep)) { continue const_loop; } } } const ids = tag_ids.get(node); for (const id of ids) { deps.delete(id.name); } const_tags.splice(i, 1); new_nodes.push(node); } } return [...new_nodes, ...other]; } return nodes; } /** * Extract nodes that are hoisted and trim whitespace according to the following rules: * - trim leading and trailing whitespace, regardless of surroundings * - keep leading / trailing whitespace of inbetween text nodes, * unless it's whitespace-only, in which case collapse to a single whitespace for all cases * except when it's children of certain elements where we know ignore whitespace (like td/option/head), * in which case we remove it entirely * @param {import('#compiler').SvelteNode} parent * @param {import('#compiler').SvelteNode[]} nodes * @param {import('#compiler').SvelteNode[]} path * @param {import('#compiler').Namespace} namespace * @param {boolean} runes * @param {boolean} preserve_whitespace * @param {boolean} preserve_comments */ export function clean_nodes( parent, nodes, path, namespace = 'html', runes = false, preserve_whitespace, preserve_comments ) { if (!runes) { nodes = sort_const_tags(nodes); } /** @type {import('#compiler').SvelteNode[]} */ const hoisted = []; /** @type {import('#compiler').SvelteNode[]} */ const regular = []; for (const node of nodes) { if (node.type === 'Comment' && !preserve_comments) { continue; } if ( node.type === 'ConstTag' || node.type === 'DebugTag' || node.type === 'SvelteBody' || node.type === 'SvelteWindow' || node.type === 'SvelteDocument' || node.type === 'SvelteHead' || node.type === 'TitleElement' || node.type === 'SnippetBlock' ) { // TODO others? hoisted.push(node); } else { regular.push(node); } } if (preserve_whitespace) { return { hoisted, trimmed: regular }; } let first, last; while ((first = regular[0]) && first.type === 'Text' && !regex_not_whitespace.test(first.data)) { regular.shift(); } if (first?.type === 'Text') { first.raw = first.raw.replace(regex_starts_with_whitespaces, ''); first.data = first.data.replace(regex_starts_with_whitespaces, ''); } while ((last = regular.at(-1)) && last.type === 'Text' && !regex_not_whitespace.test(last.data)) { regular.pop(); } if (last?.type === 'Text') { last.raw = last.raw.replace(regex_ends_with_whitespaces, ''); last.data = last.data.replace(regex_ends_with_whitespaces, ''); } const can_remove_entirely = (namespace === 'svg' && (parent.type !== 'RegularElement' || parent.name !== 'text') && !path.some((n) => n.type === 'RegularElement' && n.name === 'text')) || (parent.type === 'RegularElement' && // TODO others? (parent.name === 'select' || parent.name === 'tr' || parent.name === 'table' || parent.name === 'tbody' || parent.name === 'thead' || parent.name === 'tfoot' || parent.name === 'colgroup' || parent.name === 'datalist')); /** @type {import('#compiler').SvelteNode[]} */ const trimmed = []; // Replace any whitespace between a text and non-text node with a single spaceand keep whitespace // as-is within text nodes, or between text nodes and expression tags (because in the end they count // as one text). This way whitespace is mostly preserved when using CSS with `white-space: pre-line` // and default slot content going into a pre tag (which we can't see). for (let i = 0; i < regular.length; i++) { const prev = regular[i - 1]; const node = regular[i]; const next = regular[i + 1]; if (node.type === 'Text') { if (prev?.type !== 'ExpressionTag') { const prev_is_text_ending_with_whitespace = prev?.type === 'Text' && regex_ends_with_whitespaces.test(prev.data); node.data = node.data.replace( regex_starts_with_whitespaces, prev_is_text_ending_with_whitespace ? '' : ' ' ); node.raw = node.raw.replace( regex_starts_with_whitespaces, prev_is_text_ending_with_whitespace ? '' : ' ' ); } if (next?.type !== 'ExpressionTag') { node.data = node.data.replace(regex_ends_with_whitespaces, ' '); node.raw = node.raw.replace(regex_ends_with_whitespaces, ' '); } if (node.data && (node.data !== ' ' || !can_remove_entirely)) { trimmed.push(node); } } else { trimmed.push(node); } } return { hoisted, trimmed }; } /** * Infers the namespace for the children of a node that should be used when creating the `$.template(...)`. * @param {import('#compiler').Namespace} namespace * @param {import('#compiler').SvelteNode} parent * @param {import('#compiler').SvelteNode[]} nodes */ export function infer_namespace(namespace, parent, nodes) { if (namespace !== 'foreign') { if (parent.type === 'RegularElement' && parent.name === 'foreignObject') { return 'html'; } if (parent.type === 'RegularElement' || parent.type === 'SvelteElement') { if (parent.metadata.svg) { return 'svg'; } return parent.metadata.mathml ? 'mathml' : 'html'; } // Re-evaluate the namespace inside slot nodes that reset the namespace if ( parent.type === 'Fragment' || parent.type === 'Root' || parent.type === 'Component' || parent.type === 'SvelteComponent' || parent.type === 'SvelteFragment' || parent.type === 'SnippetBlock' || parent.type === 'SlotElement' ) { const new_namespace = check_nodes_for_namespace(nodes, 'keep'); if (new_namespace !== 'keep' && new_namespace !== 'maybe_html') { return new_namespace; } } } return namespace; } /** * Heuristic: Keep current namespace, unless we find a regular element, * in which case we always want html, or we only find svg nodes, * in which case we assume svg. * @param {import('#compiler').SvelteNode[]} nodes * @param {import('#compiler').Namespace | 'keep' | 'maybe_html'} namespace */ function check_nodes_for_namespace(nodes, namespace) { /** * @param {import('#compiler').SvelteElement | import('#compiler').RegularElement} node} * @param {{stop: () => void}} context */ const RegularElement = (node, { stop }) => { if (!node.metadata.svg && !node.metadata.mathml) { namespace = 'html'; stop(); } else if (namespace === 'keep') { namespace = node.metadata.svg ? 'svg' : 'mathml'; } }; for (const node of nodes) { walk( node, {}, { _(node, { next }) { if ( node.type === 'EachBlock' || node.type === 'IfBlock' || node.type === 'AwaitBlock' || node.type === 'Fragment' || node.type === 'KeyBlock' || node.type === 'RegularElement' || node.type === 'SvelteElement' || node.type === 'Text' ) { next(); } }, SvelteElement: RegularElement, RegularElement, Text(node) { if (node.data.trim() !== '') { namespace = 'maybe_html'; } } } ); if (namespace === 'html') return namespace; } return namespace; } /** * Determines the namespace the children of this node are in. * @param {import('#compiler').RegularElement | import('#compiler').SvelteElement} node * @param {import('#compiler').Namespace} namespace * @returns {import('#compiler').Namespace} */ export function determine_namespace_for_children(node, namespace) { if (namespace === 'foreign') { return namespace; } if (node.name === 'foreignObject') { return 'html'; } if (node.metadata.svg) { return 'svg'; } return node.metadata.mathml ? 'mathml' : 'html'; } /** * @template {import('./types.js').TransformState} T * @param {import('estree').CallExpression} node * @param {import('zimmerframe').Context<any, T>} context */ export function transform_inspect_rune(node, context) { const { state, visit } = context; const as_fn = state.options.generate === 'client'; if (!state.options.dev) return b.unary('void', b.literal(0)); if (node.callee.type === 'MemberExpression') { const raw_inspect_args = /** @type {import('estree').CallExpression} */ (node.callee.object) .arguments; const inspect_args = /** @type {Array<import('estree').Expression>} */ (raw_inspect_args.map((arg) => visit(arg))); const with_arg = /** @type {import('estree').Expression} */ (visit(node.arguments[0])); return b.call( '$.inspect', as_fn ? b.thunk(b.array(inspect_args)) : b.array(inspect_args), with_arg ); } else { const arg = node.arguments.map( (arg) => /** @type {import('estree').Expression} */ (visit(arg)) ); return b.call('$.inspect', as_fn ? b.thunk(b.array(arg)) : b.array(arg)); } } |