1berry/nodejs
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

repl: handle stage-3 language features properly

Browse Source 
This adds stage-3 language features to acorn so that the REPL is
able to parse these features properly. Otherwise these would cause
SyntaxErrors.

PR-URL: https://github.com/nodejs/node/pull/27400
Fixes: https://github.com/nodejs/node/issues/27391
Fixes: https://github.com/nodejs/node/issues/25835
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
This commit is contained in:
Ruben Bridgewater 2019-04-24 23:56:35 +02:00
parent f37e40af2b
commit e939b8f13b
No known key found for this signature in database
GPG Key ID: F07496B3EB3C1762
1 changed files with 46 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
lib/internal/repl/utils.js
View File

@ -1,6 +1,15 @@
'use strict';
const acorn = require('internal/deps/acorn/acorn/dist/acorn');
const privateMethods =
require('internal/deps/acorn-plugins/acorn-private-methods/index');
const bigInt = require('internal/deps/acorn-plugins/acorn-bigint/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,
@ -8,6 +17,12 @@ const { tokTypes: tt, Parser: AcornParser } = acorn;
// 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, `(${code}`)) return true;
let recoverable = false;
// Determine if the point of any error raised is at the end of the input.
@ -26,34 +41,39 @@ function isRecoverableError(e, code) {
// change these messages in the future, this will lead to a test
// failure, indicating that this code needs to be updated.
//
const RecoverableParser = AcornParser.extend((Parser) => {
return class extends Parser {
nextToken() {
super.nextToken();
if (this.type === tt.eof) recoverable = true;
}
raise(pos, message) {
switch (message) {
case 'Unterminated template':
case 'Unterminated comment':
recoverable = true;
break;
const RecoverableParser = AcornParser
.extend(
privateMethods,
bigInt,
classFields,
numericSeparator,
staticClassFeatures,
(Parser) => {
return class extends Parser {
nextToken() {
super.nextToken();
if (this.type === tt.eof)
recoverable = true;
}
raise(pos, message) {
switch (message) {
case 'Unterminated template':
case 'Unterminated comment':
recoverable = true;
break;
case 'Unterminated string constant':
const token = this.input.slice(this.lastTokStart, this.pos);
// See https://www.ecma-international.org/ecma-262/#sec-line-terminators
recoverable = /\\(?:\r\n?|\n|\u2028|\u2029)$/.test(token);
}
super.raise(pos, message);
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)$/.test(token)) {
recoverable = true;
}
}
super.raise(pos, message);
}
};
}
};
});
// For similar reasons as `defaultEval`, wrap expressions starting with a
// curly brace with parenthesis. Note: only the open parenthesis is added
// here as the point is to test for potentially valid but incomplete
// expressions.
if (/^\s*\{/.test(code) && isRecoverableError(e, `(${code}`)) return true;
);
// Try to parse the code with acorn. If the parse fails, ignore the acorn
// error and return the recoverable status.