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import * as b from '../../utils/builders.js'; import * as e from '../../errors.js'; import { walk } from 'zimmerframe'; import { extract_identifiers } from '../../utils/ast.js'; import check_graph_for_cycles from '../2-analyze/utils/check_graph_for_cycles.js'; import is_reference from 'is-reference'; import { set_scope } from '../scope.js'; import { dev } from '../../state.js'; /** * @param {Node} node * @returns {boolean} */ export function is_hoisted_function(node) { if ( node.type === 'ArrowFunctionExpression' || node.type === 'FunctionExpression' || node.type === 'FunctionDeclaration' ) { return node.metadata?.hoisted === true; } return false; } /** * Match Svelte 4 behaviour by sorting ConstTag nodes in topological order * @param {SvelteNode[]} nodes * @param {TransformState} state */ function sort_const_tags(nodes, state) { /** * @typedef {{ * node: AST.ConstTag; * deps: Set<Binding>; * }} Tag */ const other = []; /** @type {Map<Binding, Tag>} */ const tags = new Map(); for (const node of nodes) { if (node.type === 'ConstTag') { const declaration = node.declaration.declarations[0]; const bindings = extract_identifiers(declaration.id).map((id) => { return /** @type {Binding} */ (state.scope.get(id.name)); }); /** @type {Set<Binding>} */ const deps = new Set(); walk(declaration.init, state, { // @ts-expect-error don't know, don't care _: set_scope, Identifier(node, context) { const parent = /** @type {Expression} */ (context.path.at(-1)); if (is_reference(node, parent)) { const binding = context.state.scope.get(node.name); if (binding) deps.add(binding); } } }); for (const binding of bindings) { tags.set(binding, { node, deps }); } } else { other.push(node); } } if (tags.size === 0) { return nodes; } /** @type {Array<[Binding, Binding]>} */ const edges = []; for (const [id, tag] of tags) { for (const dep of tag.deps) { if (tags.has(dep)) { edges.push([id, dep]); } } } const cycle = check_graph_for_cycles(edges); if (cycle?.length) { const tag = /** @type {Tag} */ (tags.get(cycle[0])); e.const_tag_cycle(tag.node, cycle.map((binding) => binding.node.name).join(' → ')); } /** @type {AST.ConstTag[]} */ const sorted = []; /** @param {Tag} tag */ function add(tag) { if (sorted.includes(tag.node)) { return; } for (const dep of tag.deps) { const dep_tag = tags.get(dep); if (dep_tag) add(dep_tag); } sorted.push(tag.node); } for (const tag of tags.values()) { add(tag); } return [...sorted, ...other]; } /** * 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 {SvelteNode} parent * @param {SvelteNode[]} nodes * @param {SvelteNode[]} path * @param {Namespace} namespace * @param {TransformState & { options: ValidatedCompileOptions }} state * @param {boolean} preserve_whitespace * @param {boolean} preserve_comments */ export function clean_nodes( parent, nodes, path, namespace = 'html', state, // TODO give these defaults (state.options.preserveWhitespace and state.options.preserveComments). // first, we need to make `Component(Client|Server)TransformState` inherit from a new `ComponentTransformState` // rather than from `ClientTransformState` and `ServerTransformState` preserve_whitespace, preserve_comments ) { if (!state.analysis.runes) { nodes = sort_const_tags(nodes, state); } /** @type {SvelteNode[]} */ const hoisted = []; /** @type {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); } } let trimmed = regular; if (!preserve_whitespace) { trimmed = []; 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')); // 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); } } } var first = trimmed[0]; // Special case: Add a comment if this is a lone script tag. This ensures that our run_scripts logic in template.js // will always be able to call node.replaceWith() on the script tag in order to make it run. If we don't add this // and would still call node.replaceWith() on the script tag, it would be a no-op because the script tag has no parent. if (trimmed.length === 1 && first.type === 'RegularElement' && first.name === 'script') { trimmed.push({ type: 'Comment', data: '', parent: first.parent, start: -1, end: -1 }); } return { hoisted, trimmed, /** * In a case like `{#if x}<Foo />{/if}`, we don't need to wrap the child in * comments — we can just use the parent block's anchor for the component. * TODO extend this optimisation to other cases */ is_standalone: trimmed.length === 1 && ((first.type === 'RenderTag' && !first.metadata.dynamic) || (first.type === 'Component' && !state.options.hmr && !first.metadata.dynamic && !first.attributes.some( (attribute) => attribute.type === 'Attribute' && attribute.name.startsWith('--') ))), /** if a component/snippet/each block starts with text, we need to add an anchor comment so that its text node doesn't get fused with its surroundings */ is_text_first: (parent.type === 'Fragment' || parent.type === 'SnippetBlock' || parent.type === 'EachBlock' || parent.type === 'SvelteComponent' || parent.type === 'Component' || parent.type === 'SvelteSelf') && first && (first?.type === 'Text' || first?.type === 'ExpressionTag') }; } /** * Infers the namespace for the children of a node that should be used when creating the `$.template(...)`. * @param {Namespace} namespace * @param {SvelteNode} parent * @param {SvelteNode[]} nodes */ export function infer_namespace(namespace, parent, nodes) { 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 {SvelteNode[]} nodes * @param {Namespace | 'keep' | 'maybe_html'} namespace */ function check_nodes_for_namespace(nodes, namespace) { /** * @param {AST.SvelteElement | AST.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 {AST.RegularElement | AST.SvelteElement} node * @param {Namespace} namespace * @returns {Namespace} */ export function determine_namespace_for_children(node, namespace) { if (node.name === 'foreignObject') { return 'html'; } if (node.metadata.svg) { return 'svg'; } return node.metadata.mathml ? 'mathml' : 'html'; } /** * @template {TransformState} T * @param {CallExpression} node * @param {Context<any, T>} context */ export function transform_inspect_rune(node, context) { const { state, visit } = context; const as_fn = state.options.generate === 'client'; if (!dev) return b.empty; if (node.callee.type === 'MemberExpression') { const raw_inspect_args = /** @type {CallExpression} */ (node.callee.object).arguments; const inspect_args = /** @type {Array<Expression>} */ (raw_inspect_args.map((arg) => visit(arg))); const with_arg = /** @type {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 {Expression} */ (visit(arg))); return b.call('$.inspect', as_fn ? b.thunk(b.array(arg)) : b.array(arg)); } } |