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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/>. */
import { correctIndentation } from "./indentation";
import { getGrip } from "./evaluation-result";
const UNAVAILABLE_GRIP = { unavailable: true };
/*
* wrap the expression input in a try/catch so that it can be safely
* evaluated.
*
* NOTE: we add line after the expression to protect against comments.
*/
export function wrapExpression(input) {
return correctIndentation(`
try {
${input}
} catch (e) {
e
}
`);
}
function isUnavailable(value) {
return (
value &&
!!value.isError &&
(value.class === "ReferenceError" || value.class === "TypeError")
);
}
export function getValue(expression) {
const { value, exception, error } = expression;
if (error) {
return error;
}
if (!value) {
return UNAVAILABLE_GRIP;
}
if (exception) {
if (isUnavailable(exception)) {
return UNAVAILABLE_GRIP;
}
return exception;
}
const valueGrip = getGrip(value.result);
if (valueGrip && typeof valueGrip === "object" && valueGrip.isError) {
if (isUnavailable(valueGrip)) {
return UNAVAILABLE_GRIP;
}
const { name, message } = valueGrip.preview;
return `${name}: ${message}`;
}
return valueGrip;
}
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