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/** @import { Root, Script, SvelteNode, ValidatedCompileOptions, ValidatedModuleCompileOptions } from '#compiler' */
/** @import { AnalysisState, Visitors } from './types' */
/** @import { Analysis, ComponentAnalysis, Js, ReactiveStatement, Template } from '../types' */
import { walk } from 'zimmerframe';
import * as e from '../../errors.js';
import * as w from '../../warnings.js';
import { is_text_attribute } from '../../utils/ast.js';
import * as b from '../../utils/builders.js';
import { ReservedKeywords, Runes } from '../constants.js';
import { Scope, ScopeRoot, create_scopes, get_rune } from '../scope.js';
import check_graph_for_cycles from './utils/check_graph_for_cycles.js';
import { create_attribute } from '../nodes.js';
import { analyze_css } from './css/css-analyze.js';
import { prune } from './css/css-prune.js';
import { hash } from '../../../utils.js';
import { warn_unused } from './css/css-warn.js';
import { extract_svelte_ignore } from '../../utils/extract_svelte_ignore.js';
import { ignore_map, ignore_stack, pop_ignore, push_ignore } from '../../state.js';
import { ArrowFunctionExpression } from './visitors/ArrowFunctionExpression.js';
import { AssignmentExpression } from './visitors/AssignmentExpression.js';
import { Attribute } from './visitors/Attribute.js';
import { AwaitBlock } from './visitors/AwaitBlock.js';
import { BindDirective } from './visitors/BindDirective.js';
import { CallExpression } from './visitors/CallExpression.js';
import { ClassBody } from './visitors/ClassBody.js';
import { ClassDeclaration } from './visitors/ClassDeclaration.js';
import { ClassDirective } from './visitors/ClassDirective.js';
import { Component } from './visitors/Component.js';
import { ConstTag } from './visitors/ConstTag.js';
import { DebugTag } from './visitors/DebugTag.js';
import { EachBlock } from './visitors/EachBlock.js';
import { ExportDefaultDeclaration } from './visitors/ExportDefaultDeclaration.js';
import { ExportNamedDeclaration } from './visitors/ExportNamedDeclaration.js';
import { ExportSpecifier } from './visitors/ExportSpecifier.js';
import { ExpressionStatement } from './visitors/ExpressionStatement.js';
import { ExpressionTag } from './visitors/ExpressionTag.js';
import { FunctionDeclaration } from './visitors/FunctionDeclaration.js';
import { FunctionExpression } from './visitors/FunctionExpression.js';
import { HtmlTag } from './visitors/HtmlTag.js';
import { Identifier } from './visitors/Identifier.js';
import { IfBlock } from './visitors/IfBlock.js';
import { ImportDeclaration } from './visitors/ImportDeclaration.js';
import { KeyBlock } from './visitors/KeyBlock.js';
import { LabeledStatement } from './visitors/LabeledStatement.js';
import { LetDirective } from './visitors/LetDirective.js';
import { MemberExpression } from './visitors/MemberExpression.js';
import { NewExpression } from './visitors/NewExpression.js';
import { OnDirective } from './visitors/OnDirective.js';
import { RegularElement } from './visitors/RegularElement.js';
import { RenderTag } from './visitors/RenderTag.js';
import { SlotElement } from './visitors/SlotElement.js';
import { SnippetBlock } from './visitors/SnippetBlock.js';
import { SpreadAttribute } from './visitors/SpreadAttribute.js';
import { StyleDirective } from './visitors/StyleDirective.js';
import { SvelteComponent } from './visitors/SvelteComponent.js';
import { SvelteElement } from './visitors/SvelteElement.js';
import { SvelteFragment } from './visitors/SvelteFragment.js';
import { SvelteHead } from './visitors/SvelteHead.js';
import { SvelteSelf } from './visitors/SvelteSelf.js';
import { Text } from './visitors/Text.js';
import { TitleElement } from './visitors/TitleElement.js';
import { UpdateExpression } from './visitors/UpdateExpression.js';
import { VariableDeclarator } from './visitors/VariableDeclarator.js';
/**
* @type {Visitors}
*/
const visitors = {
_(node, { state, next, path }) {
const parent = path.at(-1);
/** @type {string[]} */
const ignores = [];
if (parent?.type === 'Fragment' && node.type !== 'Comment' && node.type !== 'Text') {
const idx = parent.nodes.indexOf(/** @type {any} */ (node));
for (let i = idx - 1; i >= 0; i--) {
const prev = parent.nodes[i];
if (prev.type === 'Comment') {
ignores.push(
...extract_svelte_ignore(
prev.start + 4 /* '<!--'.length */,
prev.data,
state.analysis.runes
)
);
} else if (prev.type !== 'Text') {
break;
}
}
} else {
const comments = /** @type {any} */ (node).leadingComments;
if (comments) {
for (const comment of comments) {
ignores.push(
...extract_svelte_ignore(
comment.start + 2 /* '//'.length */,
comment.value,
state.analysis.runes
)
);
}
}
}
if (ignores.length > 0) {
push_ignore(ignores);
}
ignore_map.set(node, structuredClone(ignore_stack));
const scope = state.scopes.get(node);
next(scope !== undefined && scope !== state.scope ? { ...state, scope } : state);
if (ignores.length > 0) {
pop_ignore();
}
},
ArrowFunctionExpression,
AssignmentExpression,
Attribute,
AwaitBlock,
BindDirective,
CallExpression,
ClassBody,
ClassDeclaration,
ClassDirective,
Component,
ConstTag,
DebugTag,
EachBlock,
ExportDefaultDeclaration,
ExportNamedDeclaration,
ExportSpecifier,
ExpressionStatement,
ExpressionTag,
FunctionDeclaration,
FunctionExpression,
HtmlTag,
Identifier,
IfBlock,
ImportDeclaration,
KeyBlock,
LabeledStatement,
LetDirective,
MemberExpression,
NewExpression,
OnDirective,
RegularElement,
RenderTag,
SlotElement,
SnippetBlock,
SpreadAttribute,
StyleDirective,
SvelteHead,
SvelteElement,
SvelteFragment,
SvelteComponent,
SvelteSelf,
Text,
TitleElement,
UpdateExpression,
VariableDeclarator
};
/**
* @param {Script | null} script
* @param {ScopeRoot} root
* @param {boolean} allow_reactive_declarations
* @param {Scope | null} parent
* @returns {Js}
*/
function js(script, root, allow_reactive_declarations, parent) {
/** @type {Program} */
const ast = script?.content ?? {
type: 'Program',
sourceType: 'module',
start: -1,
end: -1,
body: []
};
const { scope, scopes } = create_scopes(ast, root, allow_reactive_declarations, parent);
return { ast, scope, scopes };
}
/**
* @param {string} filename
*/
function get_component_name(filename) {
const parts = filename.split(/[/\\]/);
const basename = /** @type {string} */ (parts.pop());
const last_dir = /** @type {string} */ (parts.at(-1));
let name = basename.replace('.svelte', '');
if (name === 'index' && last_dir && last_dir !== 'src') {
name = last_dir;
}
return name[0].toUpperCase() + name.slice(1);
}
/**
* @param {Program} ast
* @param {ValidatedModuleCompileOptions} options
* @returns {Analysis}
*/
export function analyze_module(ast, options) {
const { scope, scopes } = create_scopes(ast, new ScopeRoot(), false, null);
for (const [name, references] of scope.references) {
if (name[0] !== '$' || ReservedKeywords.includes(name)) continue;
if (name === '$' || name[1] === '$') {
e.global_reference_invalid(references[0].node, name);
}
}
walk(
/** @type {Node} */ (ast),
{
scope,
scopes,
// @ts-expect-error TODO
analysis: { runes: true }
},
visitors
);
return {
module: { ast, scope, scopes },
name: options.filename || 'module',
accessors: false,
runes: true,
immutable: true
};
}
/**
* @param {Root} root
* @param {string} source
* @param {ValidatedCompileOptions} options
* @returns {ComponentAnalysis}
*/
export function analyze_component(root, source, options) {
const scope_root = new ScopeRoot();
const module = js(root.module, scope_root, false, null);
const instance = js(root.instance, scope_root, true, module.scope);
const { scope, scopes } = create_scopes(root.fragment, scope_root, false, instance.scope);
/** @type {Template} */
const template = { ast: root.fragment, scope, scopes };
// create synthetic bindings for store subscriptions
for (const [name, references] of module.scope.references) {
if (name[0] !== '$' || ReservedKeywords.includes(name)) continue;
if (name === '$' || name[1] === '$') {
e.global_reference_invalid(references[0].node, name);
}
const store_name = name.slice(1);
const declaration = instance.scope.get(store_name);
// If we're not in legacy mode through the compiler option, assume the user
// is referencing a rune and not a global store.
if (
options.runes === false ||
!Runes.includes(/** @type {any} */ (name)) ||
(declaration !== null &&
// const state = $state(0) is valid
(get_rune(declaration.initial, instance.scope) === null ||
// rune-line names received as props are valid too (but we have to protect against $props as store)
(store_name !== 'props' && get_rune(declaration.initial, instance.scope) === '$props')) &&
// allow `import { derived } from 'svelte/store'` in the same file as `const x = $derived(..)` because one is not a subscription to the other
!(
name === '$derived' &&
declaration.initial?.type === 'ImportDeclaration' &&
declaration.initial.source.value === 'svelte/store'
))
) {
let is_nested_store_subscription_node = undefined;
search: for (const reference of references) {
for (let i = reference.path.length - 1; i >= 0; i--) {
const scope =
scopes.get(reference.path[i]) ||
module.scopes.get(reference.path[i]) ||
instance.scopes.get(reference.path[i]);
if (scope) {
const owner = scope?.owner(store_name);
if (!!owner && owner !== module.scope && owner !== instance.scope) {
is_nested_store_subscription_node = reference.node;
break search;
}
break;
}
}
}
if (is_nested_store_subscription_node) {
e.store_invalid_scoped_subscription(is_nested_store_subscription_node);
}
if (options.runes !== false) {
if (declaration === null && /[a-z]/.test(store_name[0])) {
e.global_reference_invalid(references[0].node, name);
} else if (declaration !== null && Runes.includes(/** @type {any} */ (name))) {
for (const { node, path } of references) {
if (path.at(-1)?.type === 'CallExpression') {
w.store_rune_conflict(node, store_name);
}
}
}
}
if (module.ast) {
for (const { node, path } of references) {
// if the reference is inside context="module", error. this is a bit hacky but it works
if (
/** @type {number} */ (node.start) > /** @type {number} */ (module.ast.start) &&
/** @type {number} */ (node.end) < /** @type {number} */ (module.ast.end) &&
// const state = $state(0) is valid
get_rune(/** @type {Node} */ (path.at(-1)), module.scope) === null
) {
e.store_invalid_subscription(node);
}
}
}
const binding = instance.scope.declare(b.id(name), 'store_sub', 'synthetic');
binding.references = references;
instance.scope.references.set(name, references);
module.scope.references.delete(name);
}
}
const component_name = get_component_name(options.filename ?? 'Component');
const runes =
options.runes ??
Array.from(module.scope.references).some(([name]) => Runes.includes(/** @type {any} */ (name)));
// TODO remove all the ?? stuff, we don't need it now that we're validating the config
/** @type {ComponentAnalysis} */
const analysis = {
name: module.scope.generate(options.name ?? component_name),
root: scope_root,
module,
instance,
template,
elements: [],
runes,
immutable: runes || options.immutable,
exports: [],
uses_props: false,
uses_rest_props: false,
uses_slots: false,
uses_component_bindings: false,
uses_render_tags: false,
needs_context: false,
needs_props: false,
event_directive_node: null,
uses_event_attributes: false,
custom_element: options.customElementOptions ?? options.customElement,
inject_styles: options.css === 'injected' || options.customElement,
accessors: options.customElement
? true
: (runes ? false : !!options.accessors) ||
// because $set method needs accessors
options.compatibility?.componentApi === 4,
reactive_statements: new Map(),
binding_groups: new Map(),
slot_names: new Map(),
top_level_snippets: [],
css: {
ast: root.css,
hash: root.css
? options.cssHash({
css: root.css.content.styles,
filename: options.filename ?? '<unknown>',
name: component_name,
hash
})
: '',
keyframes: []
},
source
};
if (root.options) {
for (const attribute of root.options.attributes) {
if (attribute.name === 'accessors') {
w.options_deprecated_accessors(attribute);
}
if (attribute.name === 'customElement' && !options.customElement) {
w.options_missing_custom_element(attribute);
}
if (attribute.name === 'immutable') {
w.options_deprecated_immutable(attribute);
}
}
}
if (analysis.runes) {
const props_refs = module.scope.references.get('$$props');
if (props_refs) {
e.legacy_props_invalid(props_refs[0].node);
}
const rest_props_refs = module.scope.references.get('$$restProps');
if (rest_props_refs) {
e.legacy_rest_props_invalid(rest_props_refs[0].node);
}
for (const { ast, scope, scopes } of [module, instance, template]) {
/** @type {AnalysisState} */
const state = {
scope,
scopes,
analysis,
options,
ast_type: ast === instance.ast ? 'instance' : ast === template.ast ? 'template' : 'module',
parent_element: null,
has_props_rune: false,
component_slots: new Set(),
expression: null,
render_tag: null,
private_derived_state: [],
function_depth: scope.function_depth,
instance_scope: instance.scope,
reactive_statement: null,
reactive_statements: new Map()
};
walk(/** @type {SvelteNode} */ (ast), state, visitors);
}
// warn on any nonstate declarations that are a) reassigned and b) referenced in the template
for (const scope of [module.scope, instance.scope]) {
outer: for (const [name, binding] of scope.declarations) {
if (binding.kind === 'normal' && binding.reassigned) {
inner: for (const { path } of binding.references) {
if (path[0].type !== 'Fragment') continue;
for (let i = 1; i < path.length; i += 1) {
const type = path[i].type;
if (
type === 'FunctionDeclaration' ||
type === 'FunctionExpression' ||
type === 'ArrowFunctionExpression'
) {
continue inner;
}
// bind:this doesn't need to be a state reference if it will never change
if (
type === 'BindDirective' &&
/** @type {import('#compiler').BindDirective} */ (path[i]).name === 'this'
) {
for (let j = i - 1; j >= 0; j -= 1) {
const type = path[j].type;
if (
type === 'IfBlock' ||
type === 'EachBlock' ||
type === 'AwaitBlock' ||
type === 'KeyBlock'
) {
w.non_reactive_update(binding.node, name);
continue outer;
}
}
continue inner;
}
}
w.non_reactive_update(binding.node, name);
continue outer;
}
}
}
}
} else {
instance.scope.declare(b.id('$$props'), 'rest_prop', 'synthetic');
instance.scope.declare(b.id('$$restProps'), 'rest_prop', 'synthetic');
for (const { ast, scope, scopes } of [module, instance, template]) {
/** @type {AnalysisState} */
const state = {
scope,
scopes,
analysis,
options,
parent_element: null,
has_props_rune: false,
ast_type: ast === instance.ast ? 'instance' : ast === template.ast ? 'template' : 'module',
instance_scope: instance.scope,
reactive_statement: null,
reactive_statements: analysis.reactive_statements,
component_slots: new Set(),
expression: null,
render_tag: null,
private_derived_state: [],
function_depth: scope.function_depth
};
walk(/** @type {SvelteNode} */ (ast), state, visitors);
}
for (const [name, binding] of instance.scope.declarations) {
if (
(binding.kind === 'prop' || binding.kind === 'bindable_prop') &&
binding.node.name !== '$$props'
) {
const references = binding.references.filter(
(r) => r.node !== binding.node && r.path.at(-1)?.type !== 'ExportSpecifier'
);
if (!references.length && !instance.scope.declarations.has(`$${name}`)) {
w.export_let_unused(binding.node, name);
}
}
}
analysis.reactive_statements = order_reactive_statements(analysis.reactive_statements);
}
if (analysis.event_directive_node && analysis.uses_event_attributes) {
e.mixed_event_handler_syntaxes(
analysis.event_directive_node,
analysis.event_directive_node.name
);
}
if (analysis.uses_render_tags && (analysis.uses_slots || analysis.slot_names.size > 0)) {
const pos = analysis.slot_names.values().next().value ?? analysis.source.indexOf('$$slot');
e.slot_snippet_conflict(pos);
}
if (analysis.css.ast) {
analyze_css(analysis.css.ast, analysis);
// mark nodes as scoped/unused/empty etc
for (const element of analysis.elements) {
prune(analysis.css.ast, element);
}
const { comment } = analysis.css.ast.content;
const should_ignore_unused =
comment &&
extract_svelte_ignore(comment.start, comment.data, analysis.runes).includes(
'css_unused_selector'
);
if (!should_ignore_unused) {
warn_unused(analysis.css.ast);
}
outer: for (const element of analysis.elements) {
if (element.metadata.scoped) {
// Dynamic elements in dom mode always use spread for attributes and therefore shouldn't have a class attribute added to them
// TODO this happens during the analysis phase, which shouldn't know anything about client vs server
if (element.type === 'SvelteElement' && options.generate === 'client') continue;
/** @type {import('#compiler').Attribute | undefined} */
let class_attribute = undefined;
for (const attribute of element.attributes) {
if (attribute.type === 'SpreadAttribute') {
// The spread method appends the hash to the end of the class attribute on its own
continue outer;
}
if (attribute.type !== 'Attribute') continue;
if (attribute.name.toLowerCase() !== 'class') continue;
class_attribute = attribute;
}
if (class_attribute && class_attribute.value !== true) {
if (is_text_attribute(class_attribute)) {
class_attribute.value[0].data += ` ${analysis.css.hash}`;
} else {
/** @type {import('#compiler').Text} */
const css_text = {
type: 'Text',
data: ` ${analysis.css.hash}`,
raw: ` ${analysis.css.hash}`,
start: -1,
end: -1,
parent: null
};
if (Array.isArray(class_attribute.value)) {
class_attribute.value.push(css_text);
} else {
class_attribute.value = [class_attribute.value, css_text];
}
}
} else {
element.attributes.push(
create_attribute('class', -1, -1, [
{
type: 'Text',
data: analysis.css.hash,
raw: analysis.css.hash,
parent: null,
start: -1,
end: -1
}
])
);
}
}
}
}
// TODO
// analysis.stylesheet.warn_on_unused_selectors(analysis);
return analysis;
}
/**
* @param {Map<import('estree').LabeledStatement, ReactiveStatement>} unsorted_reactive_declarations
*/
function order_reactive_statements(unsorted_reactive_declarations) {
/** @typedef {[import('estree').LabeledStatement, ReactiveStatement]} Tuple */
/** @type {Map<string, Array<Tuple>>} */
const lookup = new Map();
for (const [node, declaration] of unsorted_reactive_declarations) {
for (const binding of declaration.assignments) {
const statements = lookup.get(binding.node.name) ?? [];
statements.push([node, declaration]);
lookup.set(binding.node.name, statements);
}
}
/** @type {Array<[string, string]>} */
const edges = [];
for (const [, { assignments, dependencies }] of unsorted_reactive_declarations) {
for (const assignment of assignments) {
for (const dependency of dependencies) {
if (!assignments.has(dependency)) {
edges.push([assignment.node.name, dependency.node.name]);
}
}
}
}
const cycle = check_graph_for_cycles(edges);
if (cycle?.length) {
const declaration = /** @type {Tuple[]} */ (lookup.get(cycle[0]))[0];
e.reactive_declaration_cycle(declaration[0], cycle.join(' → '));
}
// We use a map and take advantage of the fact that the spec says insertion order is preserved when iterating
/** @type {Map<import('estree').LabeledStatement, ReactiveStatement>} */
const reactive_declarations = new Map();
/**
*
* @param {import('estree').LabeledStatement} node
* @param {ReactiveStatement} declaration
* @returns
*/
const add_declaration = (node, declaration) => {
if ([...reactive_declarations.values()].includes(declaration)) return;
for (const binding of declaration.dependencies) {
if (declaration.assignments.has(binding)) continue;
for (const [node, earlier] of lookup.get(binding.node.name) ?? []) {
add_declaration(node, earlier);
}
}
reactive_declarations.set(node, declaration);
};
for (const [node, declaration] of unsorted_reactive_declarations) {
add_declaration(node, declaration);
}
return reactive_declarations;
}
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