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support #__PURE__ in ESTree (#4879)

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This commit is contained in:
Alex Lam S.L
2021-04-28 21:13:42 +01:00
committed by GitHub
parent a06e20304b
commit d576495e5a
7 changed files with 88 additions and 19 deletions
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29
bin/uglifyjs
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@@ -314,16 +314,43 @@ function run() {
try {
if (options.parse) {
if (options.parse.acorn) {
var annotations = Object.create(null);
files = convert_ast(function(toplevel, name) {
return require("acorn").parse(files[name], {
var content = files[name];
var list = annotations[name] = [];
var prev = -1;
return require("acorn").parse(content, {
allowHashBang: true,
ecmaVersion: "latest",
locations: true,
onComment: function(block, text, start, end) {
var match = /[@#]__PURE__/.exec(text);
if (!match) {
if (start != prev) return;
match = [ list[prev] ];
}
while (/\s/.test(content[end])) end++;
list[end] = match[0];
prev = end;
},
preserveParens: true,
program: toplevel,
sourceFile: name,
sourceType: "module",
});
});
files.walk(new UglifyJS.TreeWalker(function(node) {
if (!(node instanceof UglifyJS.AST_Call)) return;
var list = annotations[node.start.file];
var pure = list[node.start.pos];
if (!pure) {
var pos = node.start.parens;
if (pos) for (var i = 0; !pure && i < pos.length; i++) {
pure = list[pos[i]];
}
}
if (pure) node.pure = pure;
}));
} else if (options.parse.spidermonkey) {
files = convert_ast(function(toplevel, name) {
var obj = JSON.parse(files[name]);