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parse let as symbol names correctly (#5151)

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fixes #5149
This commit is contained in:
Alex Lam S.L
2021-10-21 02:14:29 +08:00
committed by GitHub
parent 32ae994f88
commit 25801627be
3 changed files with 69 additions and 19 deletions
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41
lib/parse.js
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@@ -44,10 +44,10 @@
"use strict";
var KEYWORDS = "break case catch class const continue debugger default delete do else extends finally for function if in instanceof let new return switch throw try typeof var void while with";
var KEYWORDS = "break case catch class const continue debugger default delete do else extends finally for function if in instanceof new return switch throw try typeof var void while with";
var KEYWORDS_ATOM = "false null true";
var RESERVED_WORDS = [
"abstract async await boolean byte char double enum export final float goto implements import int interface long native package private protected public short static super synchronized this throws transient volatile yield",
"abstract async await boolean byte char double enum export final float goto implements import int interface let long native package private protected public short static super synchronized this throws transient volatile yield",
KEYWORDS_ATOM,
KEYWORDS,
].join(" ");
@@ -867,6 +867,15 @@ function parse($TEXT, options) {
next();
return import_();
}
break;
case "let":
if (is_vardefs()) {
next();
var node = let_();
semicolon();
return node;
}
break;
case "yield":
if (S.in_generator) return simple_statement();
break;
@@ -952,12 +961,6 @@ function parse($TEXT, options) {
next();
return if_();
case "let":
next();
var node = let_();
semicolon();
return node;
case "return":
if (S.in_function == 0 && !options.bare_returns)
croak("'return' outside of function");
@@ -1197,7 +1200,7 @@ function parse($TEXT, options) {
if (await || !is("punc", ";")) {
init = is("keyword", "const")
? (next(), const_(true))
: is("keyword", "let")
: is("name", "let") && is_vardefs()
? (next(), let_(true))
: is("keyword", "var")
? (next(), var_(true))
@@ -1540,12 +1543,18 @@ function parse($TEXT, options) {
}
var export_decl = embed_tokens(function() {
if (is("name", "async")) {
if (is("name")) switch (S.token.value) {
case "async":
next();
expect_token("keyword", "function");
if (!is("operator", "*")) return function_(AST_AsyncDefun);
next();
return function_(AST_AsyncGeneratorDefun);
case "let":
next();
var node = let_();
semicolon();
return node;
} else if (is("keyword")) switch (S.token.value) {
case "class":
next();
@@ -1560,11 +1569,6 @@ function parse($TEXT, options) {
if (!is("operator", "*")) return function_(AST_Defun);
next();
return function_(AST_GeneratorDefun);
case "let":
next();
var node = let_();
semicolon();
return node;
case "var":
next();
var node = var_();
@@ -1725,6 +1729,11 @@ function parse($TEXT, options) {
return a;
}
function is_vardefs() {
var token = peek();
return is_token(token, "name") || is_token(token, "punc", "[") || is_token(token, "punc", "{");
}
var const_ = function(no_in) {
return new AST_Const({
start : prev(),
@@ -2135,7 +2144,7 @@ function parse($TEXT, options) {
}
function strict_verify_symbol(sym) {
if (sym.name == "arguments" || sym.name == "eval")
if (sym.name == "arguments" || sym.name == "eval" || sym.name == "let")
token_error(sym.start, "Unexpected " + sym.name + " in strict mode");
}