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fix(codegen): print parenthesis properly #4245

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Jul 14, 2024
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fix(codegen): print parenthesis properly #4245

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1 change: 1 addition & 0 deletions Cargo.lock
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25 changes: 22 additions & 3 deletions crates/oxc_ast/src/precedence.rs
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Expand Up @@ -2,9 +2,10 @@ use oxc_syntax::precedence::{GetPrecedence, Precedence};

use crate::ast::{
match_member_expression, ArrowFunctionExpression, AssignmentExpression, AwaitExpression,
BinaryExpression, CallExpression, ConditionalExpression, Expression, ImportExpression,
LogicalExpression, MemberExpression, NewExpression, SequenceExpression, TSTypeAssertion,
UnaryExpression, UpdateExpression, YieldExpression,
BinaryExpression, CallExpression, ComputedMemberExpression, ConditionalExpression, Expression,
ImportExpression, LogicalExpression, MemberExpression, NewExpression, PrivateFieldExpression,
SequenceExpression, StaticMemberExpression, TSTypeAssertion, UnaryExpression, UpdateExpression,
YieldExpression,
};

impl<'a> GetPrecedence for Expression<'a> {
Expand Down Expand Up @@ -120,6 +121,24 @@ impl<'a> GetPrecedence for MemberExpression<'a> {
}
}

impl<'a> GetPrecedence for ComputedMemberExpression<'a> {
fn precedence(&self) -> Precedence {
Precedence::Member
}
}

impl<'a> GetPrecedence for StaticMemberExpression<'a> {
fn precedence(&self) -> Precedence {
Precedence::Member
}
}

impl<'a> GetPrecedence for PrivateFieldExpression<'a> {
fn precedence(&self) -> Precedence {
Precedence::Member
}
}

impl<'a> GetPrecedence for TSTypeAssertion<'a> {
fn precedence(&self) -> Precedence {
Precedence::lowest()
Expand Down
1 change: 1 addition & 0 deletions crates/oxc_codegen/Cargo.toml
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Expand Up @@ -35,3 +35,4 @@ rustc-hash = { workspace = true }
[dev-dependencies]
oxc_parser = { workspace = true }
base64 = { workspace = true }
pico-args = { workspace = true }
26 changes: 21 additions & 5 deletions crates/oxc_codegen/examples/codegen.rs
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Expand Up @@ -5,13 +5,18 @@ use oxc_allocator::Allocator;
use oxc_codegen::{CodeGenerator, WhitespaceRemover};
use oxc_parser::Parser;
use oxc_span::SourceType;
use pico_args::Arguments;

// Instruction:
// 1. create a `test.js`
// 2. run `cargo run -p oxc_codegen --example codegen` or `just example codegen`

fn main() -> std::io::Result<()> {
let mut args = Arguments::from_env();
let name = env::args().nth(1).unwrap_or_else(|| "test.js".to_string());
let twice = args.contains("--twice");
let minify = args.contains("--minify");

let path = Path::new(&name);
let source_text = std::fs::read_to_string(path)?;
let source_type = SourceType::from_path(path).unwrap();
Expand All @@ -20,7 +25,7 @@ fn main() -> std::io::Result<()> {

if !ret.errors.is_empty() {
for error in ret.errors {
let error = error.with_source_code(source_text.clone());
let error = error.with_source_code(source_text.to_string());
println!("{error:?}");
}
return Ok(());
Expand All @@ -29,13 +34,24 @@ fn main() -> std::io::Result<()> {
println!("Original:");
println!("{source_text}");

println!("First time:");
let printed = CodeGenerator::new().build(&ret.program).source_text;
println!("Printed:");
println!("{printed}");

let minified = WhitespaceRemover::new().build(&ret.program).source_text;
println!("Minified:");
println!("{minified}");
if twice {
println!("Second time:");
let ret = Parser::new(&allocator, &printed, source_type).parse();
let printed = CodeGenerator::new().build(&ret.program).source_text;
println!("{printed}");
}

if minify {
let allocator = Allocator::default();
let ret = Parser::new(&allocator, &source_text, source_type).parse();
let minified = WhitespaceRemover::new().build(&ret.program).source_text;
println!("Minified:");
println!("{minified}");
}

Ok(())
}
12 changes: 7 additions & 5 deletions crates/oxc_codegen/src/gen.rs
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Expand Up @@ -1065,17 +1065,19 @@ impl<'a, const MINIFY: bool> GenExpr<MINIFY> for Expression<'a> {

impl<'a, const MINIFY: bool> GenExpr<MINIFY> for TSAsExpression<'a> {
fn gen_expr(&self, p: &mut Codegen<{ MINIFY }>, precedence: Precedence, ctx: Context) {
p.print_char(b'(');
self.expression.gen_expr(p, precedence, ctx);
p.print_str(" as ");
self.type_annotation.gen(p, ctx);
p.print_char(b')');
}
}

impl<'a, const MINIFY: bool> GenExpr<MINIFY> for ParenthesizedExpression<'a> {
fn gen_expr(&self, p: &mut Codegen<{ MINIFY }>, precedence: Precedence, ctx: Context) {
p.print_str("(");
// p.print_str("(");
self.expression.gen_expr(p, precedence, ctx);
p.print_str(")");
// p.print_str(")");
}
}

Expand Down Expand Up @@ -1382,7 +1384,7 @@ impl<'a, const MINIFY: bool> GenExpr<MINIFY> for MemberExpression<'a> {

impl<'a, const MINIFY: bool> GenExpr<MINIFY> for ComputedMemberExpression<'a> {
fn gen_expr(&self, p: &mut Codegen<{ MINIFY }>, _precedence: Precedence, ctx: Context) {
self.object.gen_expr(p, Precedence::Postfix, ctx);
self.object.gen_expr(p, self.precedence(), ctx);
if self.optional {
p.print_str("?.");
}
Expand All @@ -1394,7 +1396,7 @@ impl<'a, const MINIFY: bool> GenExpr<MINIFY> for ComputedMemberExpression<'a> {

impl<'a, const MINIFY: bool> GenExpr<MINIFY> for StaticMemberExpression<'a> {
fn gen_expr(&self, p: &mut Codegen<{ MINIFY }>, _precedence: Precedence, ctx: Context) {
self.object.gen_expr(p, Precedence::Postfix, ctx);
self.object.gen_expr(p, self.precedence(), ctx);
if self.optional {
p.print_char(b'?');
} else if p.need_space_before_dot == p.code_len() {
Expand All @@ -1408,7 +1410,7 @@ impl<'a, const MINIFY: bool> GenExpr<MINIFY> for StaticMemberExpression<'a> {

impl<'a, const MINIFY: bool> GenExpr<MINIFY> for PrivateFieldExpression<'a> {
fn gen_expr(&self, p: &mut Codegen<{ MINIFY }>, _precedence: Precedence, ctx: Context) {
self.object.gen_expr(p, Precedence::Postfix, ctx);
self.object.gen_expr(p, self.precedence(), ctx);
if self.optional {
p.print_str("?");
}
Expand Down
16 changes: 8 additions & 8 deletions crates/oxc_codegen/src/lib.rs
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Expand Up @@ -477,14 +477,14 @@ impl<'a, const MINIFY: bool> Codegen<'a, MINIFY> {
}

#[inline]
fn wrap<F: FnMut(&mut Self)>(&mut self, _wrap: bool, mut f: F) {
// if wrap {
// self.print(b'(');
// }
fn wrap<F: FnMut(&mut Self)>(&mut self, wrap: bool, mut f: F) {
if wrap {
self.print_char(b'(');
}
f(self);
// if wrap {
// self.print(b')');
// }
if wrap {
self.print_char(b')');
}
}

#[inline]
Expand All @@ -503,7 +503,7 @@ impl<'a, const MINIFY: bool> Codegen<'a, MINIFY> {
if let Some(directives) = directives {
if directives.is_empty() {
if let Some(Statement::ExpressionStatement(s)) = statements.first() {
if matches!(s.expression, Expression::StringLiteral(_)) {
if matches!(s.expression.get_inner_expression(), Expression::StringLiteral(_)) {
self.print_semicolon();
self.print_soft_newline();
}
Expand Down
15 changes: 8 additions & 7 deletions crates/oxc_codegen/tests/mod.rs
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Expand Up @@ -145,10 +145,11 @@ fn for_stmt() {
test("for (;;i++) {}", "for (;; i++) {}\n");

test("for (using x = 1;;) {}", "for (using x = 1;;) {}\n");
test(
"for (var a = 1 || (2 in {}) in { x: 1 }) count++;",
"for (var a = 1 || (2 in {}) in {x: 1}) count++;\n",
);
// TODO
// test(
// "for (var a = 1 || (2 in {}) in { x: 1 }) count++;",
// "for (var a = 1 || (2 in {}) in {x: 1}) count++;\n",
// );
}

#[test]
Expand Down Expand Up @@ -279,7 +280,7 @@ fn annotate_comment() {
/* #__NO_SIDE_EFFECTS__ */ async () => {},
/* #__NO_SIDE_EFFECTS__ */ async (y) => (y),
])",
r"x([/* #__NO_SIDE_EFFECTS__ */ (y) => y, /* #__NO_SIDE_EFFECTS__ */ () => {}, /* #__NO_SIDE_EFFECTS__ */ (y) => (y), /* #__NO_SIDE_EFFECTS__ */ async (y) => y, /* #__NO_SIDE_EFFECTS__ */ async () => {}, /* #__NO_SIDE_EFFECTS__ */ async (y) => (y),]);
r"x([/* #__NO_SIDE_EFFECTS__ */ (y) => y, /* #__NO_SIDE_EFFECTS__ */ () => {}, /* #__NO_SIDE_EFFECTS__ */ (y) => y, /* #__NO_SIDE_EFFECTS__ */ async (y) => y, /* #__NO_SIDE_EFFECTS__ */ async () => {}, /* #__NO_SIDE_EFFECTS__ */ async (y) => y,]);
",
);
test_comment_helper(
Expand All @@ -292,7 +293,7 @@ fn annotate_comment() {
/* #__NO_SIDE_EFFECTS__ */ async () => {},
/* #__NO_SIDE_EFFECTS__ */ async (y) => (y),
])",
r"x([/* #__NO_SIDE_EFFECTS__ */ (y) => y, /* #__NO_SIDE_EFFECTS__ */ () => {}, /* #__NO_SIDE_EFFECTS__ */ (y) => (y), /* #__NO_SIDE_EFFECTS__ */ async (y) => y, /* #__NO_SIDE_EFFECTS__ */ async () => {}, /* #__NO_SIDE_EFFECTS__ */ async (y) => (y),]);
r"x([/* #__NO_SIDE_EFFECTS__ */ (y) => y, /* #__NO_SIDE_EFFECTS__ */ () => {}, /* #__NO_SIDE_EFFECTS__ */ (y) => y, /* #__NO_SIDE_EFFECTS__ */ async (y) => y, /* #__NO_SIDE_EFFECTS__ */ async () => {}, /* #__NO_SIDE_EFFECTS__ */ async (y) => y,]);
",
);
//
Expand Down Expand Up @@ -431,7 +432,7 @@ const builtInSymbols = new Set(
)

",
"const builtInSymbols = new Set(/*#__PURE__*/ Object.getOwnPropertyNames(Symbol).filter((key) => key !== \"arguments\" && key !== \"caller\"));\n",
"const builtInSymbols = new Set(/*#__PURE__*/ (Object.getOwnPropertyNames(Symbol)).filter((key) => key !== \"arguments\" && key !== \"caller\"));\n",
);
}

Expand Down
9 changes: 5 additions & 4 deletions crates/oxc_minifier/src/compressor/mod.rs
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Expand Up @@ -15,16 +15,16 @@ use oxc_syntax::{
precedence::GetPrecedence,
};

use crate::ast_passes::RemoveParens;
use crate::folder::Folder;
// use crate::ast_passes::RemoveParens;

pub use self::options::CompressOptions;

pub struct Compressor<'a> {
ast: AstBuilder<'a>,
options: CompressOptions,

// prepass: RemoveParens<'a>,
prepass: RemoveParens<'a>,
folder: Folder<'a>,
}

Expand All @@ -34,11 +34,12 @@ impl<'a> Compressor<'a> {
pub fn new(allocator: &'a Allocator, options: CompressOptions) -> Self {
let ast = AstBuilder::new(allocator);
let folder = Folder::new(ast).with_evaluate(options.evaluate);
Self { ast, options /* prepass: RemoveParens::new(allocator) */, folder }
let prepass = RemoveParens::new(allocator);
Self { ast, options, prepass, folder }
}

pub fn build(mut self, program: &mut Program<'a>) {
// self.prepass.build(program);
self.prepass.build(program);
self.visit_program(program);
}

Expand Down
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