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support exponentiation operator (#4593)

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This commit is contained in:
Alex Lam S.L
2021-01-24 21:48:51 +00:00
committed by GitHub
parent a08d42555a
commit 9d23ba0a22
6 changed files with 94 additions and 12 deletions
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3
lib/compress.js
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@@ -4168,6 +4168,9 @@ merge(Compressor.prototype, {
case "<=" : result = left <= right; break;
case ">" : result = left > right; break;
case ">=" : result = left >= right; break;
case "**":
result = Math.pow(left, right);
break;
case "in":
if (right && typeof right == "object" && HOP(right, left)) {
result = true;

13
lib/output.js
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@@ -684,6 +684,10 @@ function OutputStream(options) {
PARENS(AST_Unary, function(output) {
var p = output.parent();
// (-x) ** y
if (p instanceof AST_Binary) return p.operator == "**" && p.left === this;
// (x++).toString(3)
// (typeof x).length
return (p instanceof AST_Call || p instanceof AST_PropAccess) && p.expression === this;
});
@@ -722,11 +726,14 @@ function OutputStream(options) {
var p = output.parent();
// await (foo && bar)
if (p instanceof AST_Await) return true;
// this deals with precedence: 3 * (2 + 1)
// this deals with precedence:
// 3 * (2 + 1)
// 3 - (2 - 1)
// (1 ** 2) ** 3
if (p instanceof AST_Binary) {
var po = p.operator, pp = PRECEDENCE[po];
var so = this.operator, sp = PRECEDENCE[so];
return pp > sp || (pp == sp && this === p.right);
return pp > sp || (pp == sp && this === p[po == "**" ? "left" : "right"]);
}
// (foo && bar)()
if (p instanceof AST_Call) return p.expression === this;
@@ -818,6 +825,8 @@ function OutputStream(options) {
PARENS(AST_Await, function(output) {
var p = output.parent();
// (await x) ** y
if (p instanceof AST_Binary) return p.operator == "**" && p.left === this;
// new (await foo)
// (await foo)(bar)
if (p instanceof AST_Call) return p.expression === this;

6
lib/parse.js
View File

@@ -81,6 +81,7 @@ var OPERATORS = makePredicate([
"*",
"/",
"%",
"**",
">>",
"<<",
">>>",
@@ -630,7 +631,8 @@ var PRECEDENCE = function(a, ret) {
["<", ">", "<=", ">=", "in", "instanceof"],
[">>", "<<", ">>>"],
["+", "-"],
["*", "/", "%"]
["*", "/", "%"],
["**"],
], {});
var ATOMIC_START_TOKEN = makePredicate("atom bigint num regexp string");
@@ -1860,7 +1862,7 @@ function parse($TEXT, options) {
var prec = op != null ? PRECEDENCE[op] : null;
if (prec != null && prec > min_prec) {
next();
var right = expr_op(maybe_await(), prec, no_in);
var right = expr_op(maybe_await(), op == "**" ? prec - 1 : prec, no_in);
return expr_op(new AST_Binary({
start : left.start,
left : left,