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pauseLocation.js
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68 lines (56 loc) · 1.69 KB
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
// @flow
import * as t from "@babel/types";
import type { Location } from "../../types";
import { traverseAst } from "./utils/ast";
const STOP = {};
export function isInvalidPauseLocation(location: Location) {
const state = {
invalid: false,
location
};
try {
traverseAst(location.sourceId, { enter: invalidLocationVisitor }, state);
} catch (e) {
if (e !== STOP) {
throw e;
}
}
return state.invalid;
}
function invalidLocationVisitor(node, ancestors, state) {
const { location } = state;
if (node.loc.end.line < location.line) {
return;
}
if (node.loc.start.line > location.line) {
throw STOP;
}
if (
location.line === node.loc.start.line &&
location.column >= node.loc.start.column &&
t.isFunction(node) &&
!t.isArrowFunctionExpression(node) &&
(location.line < node.body.loc.start.line ||
(location.line === node.body.loc.start.line &&
location.column <= node.body.loc.start.column))
) {
// Disallow pausing _inside_ in function arguments to avoid pausing inside
// of destructuring and other logic.
state.invalid = true;
throw STOP;
}
if (
location.line === node.loc.start.line &&
location.column === node.loc.start.column &&
t.isBlockStatement(node)
) {
// Disallow pausing directly before the opening curly of a block statement.
// Babel occasionally maps statements with unknown original positions to
// this location.
state.invalid = true;
throw STOP;
}
}