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support BigInt literals (#4583)

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This commit is contained in:
Alex Lam S.L
2021-01-24 01:51:18 +00:00
committed by GitHub
parent ef9f7ca3e7
commit 8bfd891c09
10 changed files with 251 additions and 176 deletions
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22
lib/parse.js
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@@ -280,9 +280,8 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
}
function read_while(pred) {
var ret = "", ch, i = 0;
while ((ch = peek()) && pred(ch, i++))
ret += next();
var ret = "", ch;
while ((ch = peek()) && pred(ch)) ret += next();
return ret;
}
@@ -292,16 +291,14 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
function read_num(prefix) {
var has_e = false, after_e = false, has_x = false, has_dot = prefix == ".";
var num = read_while(function(ch, i) {
var num = read_while(function(ch) {
var code = ch.charCodeAt(0);
switch (code) {
case 120: case 88: // xX
return has_x ? false : (has_x = true);
case 101: case 69: // eE
return has_x ? true : has_e ? false : (has_e = after_e = true);
case 45: // -
return after_e || (i == 0 && !prefix);
case 43: // +
case 43: case 45: // +-
return after_e;
case (after_e = false, 46): // .
return (!has_dot && !has_x && !has_e) ? (has_dot = true) : false;
@@ -315,8 +312,9 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
num = num.replace(has_x ? /([1-9a-f]|.0)_(?=[0-9a-f])/gi : /([1-9]|.0)_(?=[0-9])/gi, "$1");
}
var valid = parse_js_number(num);
if (!isNaN(valid)) return token("num", valid);
parse_error("Invalid syntax: " + num);
if (isNaN(valid)) parse_error("Invalid syntax: " + num);
if (has_dot || has_e || peek() != "n") return token("num", valid);
return token("bigint", num.toLowerCase() + next());
}
function read_escaped_char(in_string) {
@@ -635,7 +633,7 @@ var PRECEDENCE = function(a, ret) {
["*", "/", "%"]
], {});
var ATOMIC_START_TOKEN = makePredicate("atom num regexp string");
var ATOMIC_START_TOKEN = makePredicate("atom bigint num regexp string");
/* -----[ Parser ]----- */
@@ -783,6 +781,7 @@ function parse($TEXT, options) {
semicolon();
return dir ? new AST_Directive(body) : new AST_SimpleStatement({ body: body });
case "num":
case "bigint":
case "regexp":
case "operator":
case "atom":
@@ -1361,6 +1360,9 @@ function parse($TEXT, options) {
case "num":
ret = new AST_Number({ start: tok, end: tok, value: tok.value });
break;
case "bigint":
ret = new AST_BigInt({ start: tok, end: tok, value: tok.value });
break;
case "string":
ret = new AST_String({
start : tok,