swc_ecma_parser/parser/object.rs
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//! Parser for object literal.
use swc_common::{Spanned, DUMMY_SP};
use super::*;
use crate::parser::class_and_fn::is_not_this;
impl<I: Tokens> Parser<I> {
/// Parse a object literal or object pattern.
pub(super) fn parse_object<T>(&mut self) -> PResult<T>
where
Self: ParseObject<T>,
{
let ctx = Context {
will_expect_colon_for_cond: false,
..self.ctx()
};
self.with_ctx(ctx).parse_with(|p| {
trace_cur!(p, parse_object);
let start = cur_pos!(p);
let mut trailing_comma = None;
assert_and_bump!(p, '{');
let mut props = Vec::new();
while !eat!(p, '}') {
props.push(p.parse_object_prop()?);
if !is!(p, '}') {
expect!(p, ',');
if is!(p, '}') {
trailing_comma = Some(p.input.prev_span());
}
}
}
p.make_object(span!(p, start), props, trailing_comma)
})
}
/// spec: 'PropertyName'
pub(super) fn parse_prop_name(&mut self) -> PResult<PropName> {
trace_cur!(self, parse_prop_name);
let ctx = self.ctx();
self.with_ctx(Context {
in_property_name: true,
..ctx
})
.parse_with(|p| {
let start = cur_pos!(p);
let v = match *cur!(p, true) {
Token::Str { .. } => match bump!(p) {
Token::Str { value, raw } => PropName::Str(Str {
span: span!(p, start),
value,
raw: Some(raw),
}),
_ => unreachable!(),
},
Token::Num { .. } => match bump!(p) {
Token::Num { value, raw } => PropName::Num(Number {
span: span!(p, start),
value,
raw: Some(raw),
}),
_ => unreachable!(),
},
Token::BigInt { .. } => match bump!(p) {
Token::BigInt { value, raw } => PropName::BigInt(BigInt {
span: span!(p, start),
value,
raw: Some(raw),
}),
_ => unreachable!(),
},
Word(..) => match bump!(p) {
Word(w) => PropName::Ident(IdentName::new(w.into(), span!(p, start))),
_ => unreachable!(),
},
tok!('[') => {
bump!(p);
let inner_start = cur_pos!(p);
let mut expr = p.include_in_expr(true).parse_assignment_expr()?;
if p.syntax().typescript() && is!(p, ',') {
let mut exprs = vec![expr];
while eat!(p, ',') {
exprs.push(p.include_in_expr(true).parse_assignment_expr()?);
}
p.emit_err(span!(p, inner_start), SyntaxError::TS1171);
expr = Box::new(
SeqExpr {
span: span!(p, inner_start),
exprs,
}
.into(),
);
}
expect!(p, ']');
PropName::Computed(ComputedPropName {
span: span!(p, start),
expr,
})
}
_ => unexpected!(
p,
"identifier, string literal, numeric literal or [ for the computed key"
),
};
Ok(v)
})
}
}
impl<I: Tokens> ParseObject<Box<Expr>> for Parser<I> {
type Prop = PropOrSpread;
fn make_object(
&mut self,
span: Span,
props: Vec<Self::Prop>,
trailing_comma: Option<Span>,
) -> PResult<Box<Expr>> {
if let Some(trailing_comma) = trailing_comma {
self.state.trailing_commas.insert(span.lo, trailing_comma);
}
Ok(ObjectLit { span, props }.into())
}
/// spec: 'PropertyDefinition'
fn parse_object_prop(&mut self) -> PResult<Self::Prop> {
trace_cur!(self, parse_object_prop);
let start = cur_pos!(self);
// Parse as 'MethodDefinition'
if eat!(self, "...") {
// spread element
let dot3_token = span!(self, start);
let expr = self.include_in_expr(true).parse_assignment_expr()?;
return Ok(PropOrSpread::Spread(SpreadElement { dot3_token, expr }));
}
if eat!(self, '*') {
let name = self.parse_prop_name()?;
return self
.with_ctx(Context {
allow_direct_super: true,
in_class_field: false,
..self.ctx()
})
.parse_fn_args_body(
// no decorator in an object literal
Vec::new(),
start,
|p| p.parse_unique_formal_params(),
false,
true,
)
.map(|function| {
PropOrSpread::Prop(Box::new(Prop::Method(MethodProp {
key: name,
function,
})))
});
}
let has_modifiers = self.eat_any_ts_modifier()?;
let modifiers_span = self.input.prev_span();
let key = self.parse_prop_name()?;
if self.input.syntax().typescript()
&& !is_one_of!(self, '(', '[', ':', ',', '?', '=', '*', IdentName, Str, Num)
&& !(self.input.syntax().typescript() && is!(self, '<'))
&& !(is!(self, '}') && matches!(key, PropName::Ident(..)))
{
trace_cur!(self, parse_object_prop_error);
self.emit_err(self.input.cur_span(), SyntaxError::TS1005);
return Ok(PropOrSpread::Prop(Box::new(Prop::KeyValue(KeyValueProp {
key,
value: Invalid {
span: span!(self, start),
}
.into(),
}))));
}
//
// {[computed()]: a,}
// { 'a': a, }
// { 0: 1, }
// { a: expr, }
if eat!(self, ':') {
let value = self.include_in_expr(true).parse_assignment_expr()?;
return Ok(PropOrSpread::Prop(Box::new(Prop::KeyValue(KeyValueProp {
key,
value,
}))));
}
// Handle `a(){}` (and async(){} / get(){} / set(){})
if (self.input.syntax().typescript() && is!(self, '<')) || is!(self, '(') {
return self
.with_ctx(Context {
allow_direct_super: true,
in_class_field: false,
..self.ctx()
})
.parse_fn_args_body(
// no decorator in an object literal
Vec::new(),
start,
|p| p.parse_unique_formal_params(),
false,
false,
)
.map(|function| Box::new(Prop::Method(MethodProp { key, function })))
.map(PropOrSpread::Prop);
}
let ident = match key {
PropName::Ident(ident) => ident,
// TODO
_ => unexpected!(self, "identifier"),
};
if eat!(self, '?') {
self.emit_err(self.input.prev_span(), SyntaxError::TS1162);
}
// `ident` from parse_prop_name is parsed as 'IdentifierName'
// It means we should check for invalid expressions like { for, }
if is_one_of!(self, '=', ',', '}') {
let is_reserved_word = { self.ctx().is_reserved_word(&ident.sym) };
if is_reserved_word {
self.emit_err(ident.span, SyntaxError::ReservedWordInObjShorthandOrPat);
}
if eat!(self, '=') {
let value = self.include_in_expr(true).parse_assignment_expr()?;
let span = span!(self, start);
return Ok(PropOrSpread::Prop(Box::new(Prop::Assign(AssignProp {
span,
key: ident.into(),
value,
}))));
}
return Ok(PropOrSpread::Prop(Box::new(Prop::from(ident))));
}
// get a(){}
// set a(v){}
// async a(){}
match &*ident.sym {
"get" | "set" | "async" => {
trace_cur!(self, parse_object_prop__after_accessor);
if has_modifiers {
self.emit_err(modifiers_span, SyntaxError::TS1042);
}
let is_generator = ident.sym == "async" && eat!(self, '*');
let key = self.parse_prop_name()?;
let key_span = key.span();
self.with_ctx(Context {
allow_direct_super: true,
in_class_field: false,
..self.ctx()
})
.parse_with(|parser| {
match &*ident.sym {
"get" => parser
.parse_fn_args_body(
// no decorator in an object literal
Vec::new(),
start,
|p| {
let params = p.parse_formal_params()?;
if params.iter().filter(|p| is_not_this(p)).count() != 0 {
p.emit_err(key_span, SyntaxError::GetterParam);
}
Ok(params)
},
false,
false,
)
.map(|v| *v)
.map(
|Function {
body, return_type, ..
}| {
if parser.input.syntax().typescript()
&& parser.input.target() == EsVersion::Es3
{
parser.emit_err(key_span, SyntaxError::TS1056);
}
PropOrSpread::Prop(Box::new(Prop::Getter(GetterProp {
span: span!(parser, start),
key,
type_ann: return_type,
body,
})))
},
),
"set" => {
parser
.parse_fn_args_body(
// no decorator in an object literal
Vec::new(),
start,
|p| {
let params = p.parse_formal_params()?;
if params.iter().filter(|p| is_not_this(p)).count() != 1 {
p.emit_err(key_span, SyntaxError::SetterParam);
}
if !params.is_empty() {
if let Pat::Rest(..) = params[0].pat {
p.emit_err(
params[0].span(),
SyntaxError::RestPatInSetter,
);
}
}
if p.input.syntax().typescript()
&& p.input.target() == EsVersion::Es3
{
p.emit_err(key_span, SyntaxError::TS1056);
}
Ok(params)
},
false,
false,
)
.map(|v| *v)
.map(
|Function {
mut params, body, ..
}| {
let mut this = None;
if params.len() >= 2 {
this = Some(params.remove(0).pat);
}
let param = Box::new(
params
.into_iter()
.next()
.map(|v| v.pat)
.unwrap_or_else(|| {
parser.emit_err(
key_span,
SyntaxError::SetterParam,
);
Invalid { span: DUMMY_SP }.into()
}),
);
// debug_assert_eq!(params.len(), 1);
PropOrSpread::Prop(Box::new(Prop::Setter(SetterProp {
span: span!(parser, start),
key,
body,
param,
this_param: this,
})))
},
)
}
"async" => parser
.parse_fn_args_body(
// no decorator in an object literal
Vec::new(),
start,
|p| p.parse_unique_formal_params(),
true,
is_generator,
)
.map(|function| {
PropOrSpread::Prop(Box::new(Prop::Method(MethodProp {
key,
function,
})))
}),
_ => unreachable!(),
}
})
}
_ => {
if self.input.syntax().typescript() {
unexpected!(
self,
"... , *, (, [, :, , ?, =, an identifier, public, protected, private, \
readonly, <."
)
} else {
unexpected!(self, "... , *, (, [, :, , ?, = or an identifier")
}
}
}
}
}
impl<I: Tokens> ParseObject<Pat> for Parser<I> {
type Prop = ObjectPatProp;
fn make_object(
&mut self,
span: Span,
props: Vec<Self::Prop>,
trailing_comma: Option<Span>,
) -> PResult<Pat> {
let len = props.len();
for (i, p) in props.iter().enumerate() {
if i == len - 1 {
if let ObjectPatProp::Rest(ref rest) = p {
match *rest.arg {
Pat::Ident(..) => {
if let Some(trailing_comma) = trailing_comma {
self.emit_err(trailing_comma, SyntaxError::CommaAfterRestElement);
}
}
_ => syntax_error!(self, p.span(), SyntaxError::DotsWithoutIdentifier),
}
}
continue;
}
if let ObjectPatProp::Rest(..) = p {
self.emit_err(p.span(), SyntaxError::NonLastRestParam)
}
}
let optional = (self.input.syntax().dts() || self.ctx().in_declare) && eat!(self, '?');
Ok(ObjectPat {
span,
props,
optional,
type_ann: None,
}
.into())
}
/// Production 'BindingProperty'
fn parse_object_prop(&mut self) -> PResult<Self::Prop> {
let start = cur_pos!(self);
if eat!(self, "...") {
// spread element
let dot3_token = span!(self, start);
let arg = Box::new(self.parse_binding_pat_or_ident(false)?);
return Ok(ObjectPatProp::Rest(RestPat {
span: span!(self, start),
dot3_token,
arg,
type_ann: None,
}));
}
let key = self.parse_prop_name()?;
if eat!(self, ':') {
let value = Box::new(self.parse_binding_element()?);
return Ok(ObjectPatProp::KeyValue(KeyValuePatProp { key, value }));
}
let key = match key {
PropName::Ident(ident) => ident,
_ => unexpected!(self, "an identifier"),
};
let value = if eat!(self, '=') {
self.include_in_expr(true)
.parse_assignment_expr()
.map(Some)?
} else {
if self.ctx().is_reserved_word(&key.sym) {
self.emit_err(key.span, SyntaxError::ReservedWordInObjShorthandOrPat);
}
None
};
Ok(ObjectPatProp::Assign(AssignPatProp {
span: span!(self, start),
key: key.into(),
value,
}))
}
}