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make comments output more robust (#2633)

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- improve handling of comments right after `return`
- retain comments after `OutputStream`
- preserve trailing comments
- fix handling of new line before comments
- handle comments around parentheses

fixes #88
fixes #112
fixes #218
fixes #372
fixes #2629
This commit is contained in:
Alex Lam S.L
2017-12-22 04:59:54 +08:00
committed by GitHub
parent 4113609dd4
commit edb4e3bd52
7 changed files with 401 additions and 90 deletions
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172
test/mocha/comment.js
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@@ -47,4 +47,176 @@ describe("Comment", function() {
}, fail, tests[i]);
}
});
it("Should handle comment within return correctly", function() {
var result = uglify.minify([
"function unequal(x, y) {",
" return (",
" // Either one",
" x < y",
" ||",
" y < x",
" );",
"}",
].join("\n"), {
compress: false,
mangle: false,
output: {
beautify: true,
comments: "all",
},
});
if (result.error) throw result.error;
assert.strictEqual(result.code, [
"function unequal(x, y) {",
" // Either one",
" return x < y || y < x;",
"}",
].join("\n"));
});
it("Should handle comment folded into return correctly", function() {
var result = uglify.minify([
"function f() {",
" /* boo */ x();",
" return y();",
"}",
].join("\n"), {
mangle: false,
output: {
beautify: true,
comments: "all",
},
});
if (result.error) throw result.error;
assert.strictEqual(result.code, [
"function f() {",
" /* boo */",
" return x(), y();",
"}",
].join("\n"));
});
it("Should not drop comments after first OutputStream", function() {
var code = "/* boo */\nx();";
var ast = uglify.parse(code);
var out1 = uglify.OutputStream({
beautify: true,
comments: "all",
});
ast.print(out1);
var out2 = uglify.OutputStream({
beautify: true,
comments: "all",
});
ast.print(out2);
assert.strictEqual(out1.get(), code);
assert.strictEqual(out2.get(), out1.get());
});
it("Should retain trailing comments", function() {
var code = [
"if (foo /* lost comment */ && bar /* lost comment */) {",
" // this one is kept",
" {/* lost comment */}",
" !function() {",
" // lost comment",
" }();",
" function baz() {/* lost comment */}",
" // lost comment",
"}",
"// comments right before EOF are lost as well",
].join("\n");
var result = uglify.minify(code, {
compress: false,
mangle: false,
output: {
beautify: true,
comments: "all",
},
});
if (result.error) throw result.error;
assert.strictEqual(result.code, code);
});
it("Should correctly preserve new lines around comments", function() {
var tests = [
[
"// foo",
"// bar",
"x();",
].join("\n"),
[
"// foo",
"/* bar */",
"x();",
].join("\n"),
[
"// foo",
"/* bar */ x();",
].join("\n"),
[
"/* foo */",
"// bar",
"x();",
].join("\n"),
[
"/* foo */ // bar",
"x();",
].join("\n"),
[
"/* foo */",
"/* bar */",
"x();",
].join("\n"),
[
"/* foo */",
"/* bar */ x();",
].join("\n"),
[
"/* foo */ /* bar */",
"x();",
].join("\n"),
"/* foo */ /* bar */ x();",
].forEach(function(code) {
var result = uglify.minify(code, {
compress: false,
mangle: false,
output: {
beautify: true,
comments: "all",
},
});
if (result.error) throw result.error;
assert.strictEqual(result.code, code);
});
});
it("Should preserve new line before comment without beautify", function() {
var code = [
"function f(){",
"/* foo */bar()}",
].join("\n");
var result = uglify.minify(code, {
compress: false,
mangle: false,
output: {
comments: "all",
},
});
if (result.error) throw result.error;
assert.strictEqual(result.code, code);
});
it("Should preserve comments around IIFE", function() {
var result = uglify.minify("/*a*/(/*b*/function(){/*c*/}/*d*/)/*e*/();", {
compress: false,
mangle: false,
output: {
comments: "all",
},
});
if (result.error) throw result.error;
assert.strictEqual(result.code, "/*a*/ /*b*/(function(){/*c*/}/*d*/ /*e*/)();");
});
});