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/** @import { AST, SvelteNode, TemplateNode } from '#compiler' */
/** @import * as Legacy from './types/legacy-nodes.js' */
import { walk } from 'zimmerframe';
import {
regex_ends_with_whitespaces,
regex_not_whitespace,
regex_starts_with_whitespaces
} from './phases/patterns.js';
import { extract_svelte_ignore } from './utils/extract_svelte_ignore.js';
/**
* Some of the legacy Svelte AST nodes remove whitespace from the start and end of their children.
* @param {TemplateNode[]} nodes
*/
function remove_surrounding_whitespace_nodes(nodes) {
const first = nodes.at(0);
const last = nodes.at(-1);
if (first?.type === 'Text') {
if (!regex_not_whitespace.test(first.data)) {
nodes.shift();
} else {
first.data = first.data.replace(regex_starts_with_whitespaces, '');
}
}
if (last?.type === 'Text') {
if (!regex_not_whitespace.test(last.data)) {
nodes.pop();
} else {
last.data = last.data.replace(regex_ends_with_whitespaces, '');
}
}
}
/**
* Transform our nice modern AST into the monstrosity emitted by Svelte 4
* @param {string} source
* @param {AST.Root} ast
* @returns {Legacy.LegacyRoot}
*/
export function convert(source, ast) {
const root = /** @type {SvelteNode | Legacy.LegacySvelteNode} */ (ast);
return /** @type {Legacy.LegacyRoot} */ (
walk(root, null, {
_(node, { next }) {
// @ts-ignore
delete node.parent;
// @ts-ignore
delete node.metadata;
next();
},
// @ts-ignore
Root(node, { visit }) {
const { instance, module, options } = node;
// Insert svelte:options back into the root nodes
if (/** @type {any} */ (options)?.__raw__) {
let idx = node.fragment.nodes.findIndex((node) => options.end <= node.start);
if (idx === -1) {
idx = node.fragment.nodes.length;
}
// @ts-ignore
delete options.__raw__.parent;
node.fragment.nodes.splice(idx, 0, /** @type {any} */ (options).__raw__);
}
/** @type {number | null} */
let start = null;
/** @type {number | null} */
let end = null;
if (node.fragment.nodes.length > 0) {
const first = /** @type {AST.BaseNode} */ (node.fragment.nodes.at(0));
const last = /** @type {AST.BaseNode} */ (node.fragment.nodes.at(-1));
start = first.start;
end = last.end;
while (/\s/.test(source[start])) start += 1;
while (/\s/.test(source[end - 1])) end -= 1;
}
if (instance) {
// @ts-ignore
delete instance.parent;
// @ts-ignore
delete instance.attributes;
}
if (module) {
// @ts-ignore
delete module.parent;
// @ts-ignore
delete module.attributes;
}
return {
html: {
type: 'Fragment',
start,
end,
children: node.fragment.nodes.map((child) => visit(child))
},
instance,
module,
css: ast.css ? visit(ast.css) : undefined
};
},
AnimateDirective(node) {
return { ...node, type: 'Animation' };
},
// @ts-ignore
AwaitBlock(node, { visit }) {
let pendingblock = {
type: 'PendingBlock',
/** @type {number | null} */
start: null,
/** @type {number | null} */
end: null,
children: node.pending?.nodes.map((child) => visit(child)) ?? [],
skip: true
};
let thenblock = {
type: 'ThenBlock',
/** @type {number | null} */
start: null,
/** @type {number | null} */
end: null,
children: node.then?.nodes.map((child) => visit(child)) ?? [],
skip: true
};
let catchblock = {
type: 'CatchBlock',
/** @type {number | null} */
start: null,
/** @type {number | null} */
end: null,
children: node.catch?.nodes.map((child) => visit(child)) ?? [],
skip: true
};
if (node.pending) {
const first = node.pending.nodes.at(0);
const last = node.pending.nodes.at(-1);
pendingblock.start = first?.start ?? source.indexOf('}', node.expression.end) + 1;
pendingblock.end = last?.end ?? pendingblock.start;
pendingblock.skip = false;
}
if (node.then) {
const first = node.then.nodes.at(0);
const last = node.then.nodes.at(-1);
thenblock.start =
pendingblock.end ?? first?.start ?? source.indexOf('}', node.expression.end) + 1;
thenblock.end =
last?.end ?? source.lastIndexOf('}', pendingblock.end ?? node.expression.end) + 1;
thenblock.skip = false;
}
if (node.catch) {
const first = node.catch.nodes.at(0);
const last = node.catch.nodes.at(-1);
catchblock.start =
thenblock.end ??
pendingblock.end ??
first?.start ??
source.indexOf('}', node.expression.end) + 1;
catchblock.end =
last?.end ??
source.lastIndexOf('}', thenblock.end ?? pendingblock.end ?? node.expression.end) + 1;
catchblock.skip = false;
}
return {
type: 'AwaitBlock',
start: node.start,
end: node.end,
expression: node.expression,
value: node.value,
error: node.error,
pending: pendingblock,
then: thenblock,
catch: catchblock
};
},
BindDirective(node) {
return { ...node, type: 'Binding' };
},
ClassDirective(node) {
return { ...node, type: 'Class' };
},
Comment(node) {
return {
...node,
ignores: extract_svelte_ignore(node.start, node.data, false)
};
},
ComplexSelector(node) {
const children = [];
for (const child of node.children) {
if (child.combinator) {
children.push(child.combinator);
}
children.push(...child.selectors);
}
return {
type: 'Selector',
start: node.start,
end: node.end,
children
};
},
Component(node, { visit }) {
return {
type: 'InlineComponent',
start: node.start,
end: node.end,
name: node.name,
attributes: node.attributes.map(
(child) => /** @type {Legacy.LegacyAttributeLike} */ (visit(child))
),
children: node.fragment.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
)
};
},
// @ts-ignore
ConstTag(node) {
if (/** @type {Legacy.LegacyConstTag} */ (node).expression !== undefined) {
return node;
}
const modern_node = /** @type {AST.ConstTag} */ (node);
const { id: left } = { ...modern_node.declaration.declarations[0] };
// @ts-ignore
delete left.typeAnnotation;
return {
type: 'ConstTag',
start: modern_node.start,
end: node.end,
expression: {
type: 'AssignmentExpression',
start: (modern_node.declaration.start ?? 0) + 'const '.length,
end: modern_node.declaration.end ?? 0,
operator: '=',
left,
right: modern_node.declaration.declarations[0].init
}
};
},
// @ts-ignore
KeyBlock(node, { visit }) {
remove_surrounding_whitespace_nodes(node.fragment.nodes);
return {
type: 'KeyBlock',
start: node.start,
end: node.end,
expression: node.expression,
children: node.fragment.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
)
};
},
// @ts-ignore
EachBlock(node, { visit }) {
let elseblock = undefined;
if (node.fallback) {
const first = node.fallback.nodes.at(0);
const end = source.lastIndexOf('{', /** @type {number} */ (node.end) - 1);
const start = first?.start ?? end;
remove_surrounding_whitespace_nodes(node.fallback.nodes);
elseblock = {
type: 'ElseBlock',
start,
end,
children: node.fallback.nodes.map((child) => visit(child))
};
}
remove_surrounding_whitespace_nodes(node.body.nodes);
return {
type: 'EachBlock',
start: node.start,
end: node.end,
children: node.body.nodes.map((child) => visit(child)),
context: node.context,
expression: node.expression,
index: node.index,
key: node.key,
else: elseblock
};
},
ExpressionTag(node, { path }) {
const parent = path.at(-1);
if (parent?.type === 'Attribute') {
if (source[parent.start] === '{') {
return {
type: 'AttributeShorthand',
start: node.start,
end: node.end,
expression: node.expression
};
}
}
return {
type: 'MustacheTag',
start: node.start,
end: node.end,
expression: node.expression
};
},
HtmlTag(node) {
return { ...node, type: 'RawMustacheTag' };
},
// @ts-ignore
IfBlock(node, { visit }) {
let elseblock = undefined;
if (node.alternate) {
let nodes = node.alternate.nodes;
if (nodes.length === 1 && nodes[0].type === 'IfBlock' && nodes[0].elseif) {
nodes = nodes[0].consequent.nodes;
}
const end = source.lastIndexOf('{', /** @type {number} */ (node.end) - 1);
const start = nodes.at(0)?.start ?? end;
remove_surrounding_whitespace_nodes(node.alternate.nodes);
elseblock = {
type: 'ElseBlock',
start,
end: end,
children: node.alternate.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
)
};
}
const start = node.elseif
? node.consequent.nodes[0]?.start ??
source.lastIndexOf('{', /** @type {number} */ (node.end) - 1)
: node.start;
remove_surrounding_whitespace_nodes(node.consequent.nodes);
return {
type: 'IfBlock',
start,
end: node.end,
expression: node.test,
children: node.consequent.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
),
else: elseblock,
elseif: node.elseif ? true : undefined
};
},
OnDirective(node) {
return { ...node, type: 'EventHandler' };
},
// @ts-expect-error
SnippetBlock(node, { visit }) {
remove_surrounding_whitespace_nodes(node.body.nodes);
return {
type: 'SnippetBlock',
start: node.start,
end: node.end,
expression: node.expression,
parameters: node.parameters,
children: node.body.nodes.map((child) => visit(child))
};
},
RegularElement(node, { visit }) {
return {
type: 'Element',
start: node.start,
end: node.end,
name: node.name,
attributes: node.attributes.map((child) => visit(child)),
children: node.fragment.nodes.map((child) => visit(child))
};
},
SlotElement(node, { visit }) {
return {
type: 'Slot',
start: node.start,
end: node.end,
name: node.name,
attributes: node.attributes.map(
(child) => /** @type {Legacy.LegacyAttributeLike} */ (visit(child))
),
children: node.fragment.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
)
};
},
Attribute(node, { visit, next, path }) {
if (node.value !== true && !Array.isArray(node.value)) {
path.push(node);
const value = /** @type {Legacy.LegacyAttribute['value']} */ ([visit(node.value)]);
path.pop();
return {
...node,
value
};
} else {
return next();
}
},
StyleDirective(node, { visit, next, path }) {
if (node.value !== true && !Array.isArray(node.value)) {
path.push(node);
const value = /** @type {Legacy.LegacyStyleDirective['value']} */ ([visit(node.value)]);
path.pop();
return {
...node,
value
};
} else {
return next();
}
},
SpreadAttribute(node) {
return { ...node, type: 'Spread' };
},
StyleSheet(node, context) {
return {
...node,
...context.next(),
type: 'Style'
};
},
SvelteBody(node, { visit }) {
return {
type: 'Body',
name: 'svelte:body',
start: node.start,
end: node.end,
attributes: node.attributes.map(
(child) => /** @type {Legacy.LegacyAttributeLike} */ (visit(child))
),
children: node.fragment.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
)
};
},
SvelteComponent(node, { visit }) {
return {
type: 'InlineComponent',
name: 'svelte:component',
start: node.start,
end: node.end,
expression: node.expression,
attributes: node.attributes.map(
(child) => /** @type {Legacy.LegacyAttributeLike} */ (visit(child))
),
children: node.fragment.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
)
};
},
SvelteDocument(node, { visit }) {
return {
type: 'Document',
name: 'svelte:document',
start: node.start,
end: node.end,
attributes: node.attributes.map(
(child) => /** @type {Legacy.LegacyAttributeLike} */ (visit(child))
),
children: node.fragment.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
)
};
},
SvelteElement(node, { visit }) {
/** @type {Expression | string} */
let tag = node.tag;
if (
tag.type === 'Literal' &&
typeof tag.value === 'string' &&
source[/** @type {number} */ (node.tag.start) - 1] !== '{'
) {
tag = tag.value;
}
return {
type: 'Element',
name: 'svelte:element',
start: node.start,
end: node.end,
tag,
attributes: node.attributes.map((child) => visit(child)),
children: node.fragment.nodes.map((child) => visit(child))
};
},
SvelteFragment(node, { visit }) {
return {
type: 'SlotTemplate',
name: 'svelte:fragment',
start: node.start,
end: node.end,
attributes: node.attributes.map(
(a) => /** @type {Legacy.LegacyAttributeLike} */ (visit(a))
),
children: node.fragment.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
)
};
},
SvelteHead(node, { visit }) {
return {
type: 'Head',
name: 'svelte:head',
start: node.start,
end: node.end,
attributes: node.attributes.map(
(child) => /** @type {Legacy.LegacyAttributeLike} */ (visit(child))
),
children: node.fragment.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
)
};
},
SvelteOptions(node, { visit }) {
return {
type: 'Options',
name: 'svelte:options',
start: node.start,
end: node.end,
attributes: node.attributes.map(
(child) => /** @type {Legacy.LegacyAttributeLike} */ (visit(child))
)
};
},
SvelteSelf(node, { visit }) {
return {
type: 'InlineComponent',
name: 'svelte:self',
start: node.start,
end: node.end,
attributes: node.attributes.map(
(child) => /** @type {Legacy.LegacyAttributeLike} */ (visit(child))
),
children: node.fragment.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
)
};
},
SvelteWindow(node, { visit }) {
return {
type: 'Window',
name: 'svelte:window',
start: node.start,
end: node.end,
attributes: node.attributes.map(
(child) => /** @type {Legacy.LegacyAttributeLike} */ (visit(child))
),
children: node.fragment.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
)
};
},
Text(node, { path }) {
const parent = path.at(-1);
if (parent?.type === 'RegularElement' && parent.name === 'style') {
// these text nodes are missing `raw` for some dumb reason
return /** @type {AST.Text} */ ({
type: 'Text',
start: node.start,
end: node.end,
data: node.data
});
}
},
TitleElement(node, { visit }) {
return {
type: 'Title',
name: 'title',
start: node.start,
end: node.end,
attributes: node.attributes.map(
(child) => /** @type {Legacy.LegacyAttributeLike} */ (visit(child))
),
children: node.fragment.nodes.map(
(child) => /** @type {Legacy.LegacyElementLike} */ (visit(child))
)
};
},
TransitionDirective(node) {
return { ...node, type: 'Transition' };
},
UseDirective(node) {
return { ...node, type: 'Action' };
},
LetDirective(node) {
return { ...node, type: 'Let' };
}
})
);
}
|