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'use strict';
const acorn = require('internal/deps/acorn/acorn/dist/acorn');
const privateMethods =
require('internal/deps/acorn-plugins/acorn-private-methods/index');
const classFields =
require('internal/deps/acorn-plugins/acorn-class-fields/index');
const numericSeparator =
require('internal/deps/acorn-plugins/acorn-numeric-separator/index');
const staticClassFeatures =
require('internal/deps/acorn-plugins/acorn-static-class-features/index');
const { tokTypes: tt, Parser: AcornParser } = acorn;
// If the error is that we've unexpectedly ended the input,
// then let the user try to recover by adding more input.
// Note: `e` (the original exception) is not used by the current implementation,
// but may be needed in the future.
function isRecoverableError(e, code) {
// For similar reasons as `defaultEval`, wrap expressions starting with a
// curly brace with parenthesis. Note: only the open parenthesis is added
// here as the point is to test for potentially valid but incomplete
// expressions.
if (/^\s*\{/.test(code) && isRecoverableError(e, `(${code}`)) return true;
let recoverable = false;
// Determine if the point of any error raised is at the end of the input.
// There are two cases to consider:
//
// 1. Any error raised after we have encountered the 'eof' token.
// This prevents us from declaring partial tokens (like '2e') as
// recoverable.
//
// 2. Three cases where tokens can legally span lines. This is
// template, comment, and strings with a backslash at the end of
// the line, indicating a continuation. Note that we need to look
// for the specific errors of 'unterminated' kind (not, for example,
// a syntax error in a ${} expression in a template), and the only
// way to do that currently is to look at the message. Should Acorn
// change these messages in the future, this will lead to a test
// failure, indicating that this code needs to be updated.
//
const RecoverableParser = AcornParser
.extend(
privateMethods,
classFields,
numericSeparator,
staticClassFeatures,
(Parser) => {
return class extends Parser {
nextToken() {
super.nextToken();
if (this.type === tt.eof)
recoverable = true;
}
raise(pos, message) {
switch (message) {
case 'Unterminated template':
case 'Unterminated comment':
recoverable = true;
break;
case 'Unterminated string constant':
const token = this.input.slice(this.lastTokStart, this.pos);
// See https://www.ecma-international.org/ecma-262/#sec-line-terminators
if (/\\(?:\r\n?|\n|\u2028|\u2029)$/.test(token)) {
recoverable = true;
}
}
super.raise(pos, message);
}
};
}
);
// Try to parse the code with acorn. If the parse fails, ignore the acorn
// error and return the recoverable status.
try {
RecoverableParser.parse(code, { ecmaVersion: 11 });
// Odd case: the underlying JS engine (V8, Chakra) rejected this input
// but Acorn detected no issue. Presume that additional text won't
// address this issue.
return false;
} catch {
return recoverable;
}
}
module.exports = {
isRecoverableError,
kStandaloneREPL: Symbol('kStandaloneREPL')
};