Press n or j to go to the next uncovered block, b, p or k for the previous block.
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/** @import { Node } from 'acorn' */
import * as acorn from 'acorn';
import { walk } from 'zimmerframe';
import { tsPlugin } from 'acorn-typescript';
import { locator } from '../../state.js';
const ParserWithTS = acorn.Parser.extend(tsPlugin({ allowSatisfies: true }));
/**
* @param {string} source
* @param {boolean} typescript
*/
export function parse(source, typescript) {
const parser = typescript ? ParserWithTS : acorn.Parser;
const { onComment, add_comments } = get_comment_handlers(source);
const ast = parser.parse(source, {
onComment,
sourceType: 'module',
ecmaVersion: 13,
locations: true
});
if (typescript) amend(source, ast);
add_comments(ast);
return /** @type {Program} */ (ast);
}
/**
* @param {string} source
* @param {boolean} typescript
* @param {number} index
* @returns {acorn.Expression & { leadingComments?: CommentWithLocation[]; trailingComments?: CommentWithLocation[]; }}
*/
export function parse_expression_at(source, typescript, index) {
const parser = typescript ? ParserWithTS : acorn.Parser;
const { onComment, add_comments } = get_comment_handlers(source);
const ast = parser.parseExpressionAt(source, index, {
onComment,
sourceType: 'module',
ecmaVersion: 13,
locations: true
});
if (typescript) amend(source, ast);
add_comments(ast);
return ast;
}
/**
* Acorn doesn't add comments to the AST by itself. This factory returns the capabilities
* to add them after the fact. They are needed in order to support `svelte-ignore` comments
* in JS code and so that `prettier-plugin-svelte` doesn't remove all comments when formatting.
* @param {string} source
*/
function get_comment_handlers(source) {
/**
* @typedef {Comment & {
* start: number;
* end: number;
* }} CommentWithLocation
*/
/** @type {CommentWithLocation[]} */
const comments = [];
return {
/**
* @param {boolean} block
* @param {string} value
* @param {number} start
* @param {number} end
*/
onComment: (block, value, start, end) => {
if (block && /\n/.test(value)) {
let a = start;
while (a > 0 && source[a - 1] !== '\n') a -= 1;
let b = a;
while (/[ \t]/.test(source[b])) b += 1;
const indentation = source.slice(a, b);
value = value.replace(new RegExp(`^${indentation}`, 'gm'), '');
}
comments.push({ type: block ? 'Block' : 'Line', value, start, end });
},
/** @param {acorn.Node & { leadingComments?: CommentWithLocation[]; trailingComments?: CommentWithLocation[]; }} ast */
add_comments(ast) {
if (comments.length === 0) return;
walk(ast, null, {
_(node, { next, path }) {
let comment;
while (comments[0] && comments[0].start < node.start) {
comment = /** @type {CommentWithLocation} */ (comments.shift());
(node.leadingComments ||= []).push(comment);
}
next();
if (comments[0]) {
const parent = /** @type {any} */ (path.at(-1));
if (parent === undefined || node.end !== parent.end) {
const slice = source.slice(node.end, comments[0].start);
const is_last_in_body =
((parent?.type === 'BlockStatement' || parent?.type === 'Program') &&
parent.body.indexOf(node) === parent.body.length - 1) ||
(parent?.type === 'ArrayExpression' &&
parent.elements.indexOf(node) === parent.elements.length - 1) ||
(parent?.type === 'ObjectExpression' &&
parent.properties.indexOf(node) === parent.properties.length - 1);
if (is_last_in_body) {
// Special case: There can be multiple trailing comments after the last node in a block,
// and they can be separated by newlines
let end = node.end;
while (comments.length) {
const comment = comments[0];
if (parent && comment.start >= parent.end) break;
(node.trailingComments ||= []).push(comment);
comments.shift();
end = comment.end;
}
} else if (node.end <= comments[0].start && /^[,) \t]*$/.test(slice)) {
node.trailingComments = [/** @type {CommentWithLocation} */ (comments.shift())];
}
}
}
}
});
// Special case: Trailing comments after the root node (which can only happen for expression tags or for Program nodes).
// Adding them ensures that we can later detect the end of the expression tag correctly.
if (comments.length > 0 && (comments[0].start >= ast.end || ast.type === 'Program')) {
(ast.trailingComments ||= []).push(...comments.splice(0));
}
}
};
}
/**
* Tidy up some stuff left behind by acorn-typescript
* @param {string} source
* @param {Node} node
*/
function amend(source, node) {
return walk(node, null, {
_(node, context) {
// @ts-expect-error
delete node.loc.start.index;
// @ts-expect-error
delete node.loc.end.index;
if (typeof node.loc?.end === 'number') {
const loc = locator(node.loc.end);
if (loc) {
node.loc.end = {
line: loc.line,
column: loc.column
};
}
}
if (
/** @type {any} */ (node).typeAnnotation &&
(node.end === undefined || node.end < node.start)
) {
// i think there might be a bug in acorn-typescript that prevents
// `end` from being assigned when there's a type annotation
let end = /** @type {any} */ (node).typeAnnotation.start;
while (/\s/.test(source[end - 1])) end -= 1;
node.end = end;
}
context.next();
}
});
}
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