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syntax: Merge parsing code for structures and variants

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This commit is contained in:
Vadim Petrochenkov
2015-11-09 18:43:32 +03:00
parent 5b4986fa57
commit e6b14aab05
3 changed files with 33 additions and 51 deletions
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64
src/libsyntax/parse/parser.rs
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@@ -4686,18 +4686,21 @@ impl<'a> Parser<'a> {
VariantData::Unit(ast::DUMMY_NODE_ID)
} else {
// If we see: `struct Foo<T> where T: Copy { ... }`
VariantData::Struct(try!(self.parse_record_struct_body()), ast::DUMMY_NODE_ID)
VariantData::Struct(try!(self.parse_record_struct_body(true)), ast::DUMMY_NODE_ID)
}
// No `where` so: `struct Foo<T>;`
} else if try!(self.eat(&token::Semi) ){
VariantData::Unit(ast::DUMMY_NODE_ID)
// Record-style struct definition
} else if self.token == token::OpenDelim(token::Brace) {
VariantData::Struct(try!(self.parse_record_struct_body()), ast::DUMMY_NODE_ID)
VariantData::Struct(try!(self.parse_record_struct_body(true)), ast::DUMMY_NODE_ID)
// Tuple-style struct definition with optional where-clause.
} else if self.token == token::OpenDelim(token::Paren) {
VariantData::Tuple(try!(self.parse_tuple_struct_body(&mut generics)),
ast::DUMMY_NODE_ID)
let body = VariantData::Tuple(try!(self.parse_tuple_struct_body(true)),
ast::DUMMY_NODE_ID);
generics.where_clause = try!(self.parse_where_clause());
try!(self.expect(&token::Semi));
body
} else {
let token_str = self.this_token_to_string();
return Err(self.fatal(&format!("expected `where`, `{{`, `(`, or `;` after struct \
@@ -4707,11 +4710,11 @@ impl<'a> Parser<'a> {
Ok((class_name, ItemStruct(vdata, generics), None))
}
pub fn parse_record_struct_body(&mut self) -> PResult<Vec<StructField>> {
pub fn parse_record_struct_body(&mut self, allow_pub: bool) -> PResult<Vec<StructField>> {
let mut fields = Vec::new();
if try!(self.eat(&token::OpenDelim(token::Brace)) ){
while self.token != token::CloseDelim(token::Brace) {
fields.push(try!(self.parse_struct_decl_field(true)));
fields.push(try!(self.parse_struct_decl_field(allow_pub)));
}
try!(self.bump());
@@ -4725,9 +4728,7 @@ impl<'a> Parser<'a> {
Ok(fields)
}
pub fn parse_tuple_struct_body(&mut self,
generics: &mut ast::Generics)
-> PResult<Vec<StructField>> {
pub fn parse_tuple_struct_body(&mut self, allow_pub: bool) -> PResult<Vec<StructField>> {
// This is the case where we find `struct Foo<T>(T) where T: Copy;`
// Unit like structs are handled in parse_item_struct function
let fields = try!(self.parse_unspanned_seq(
@@ -4738,7 +4739,9 @@ impl<'a> Parser<'a> {
let attrs = try!(p.parse_outer_attributes());
let lo = p.span.lo;
let struct_field_ = ast::StructField_ {
kind: UnnamedField(try!(p.parse_visibility())),
kind: UnnamedField (
if allow_pub { try!(p.parse_visibility()) } else { Inherited }
),
id: ast::DUMMY_NODE_ID,
ty: try!(p.parse_ty_sum()),
attrs: attrs,
@@ -4746,8 +4749,6 @@ impl<'a> Parser<'a> {
Ok(spanned(lo, p.span.hi, struct_field_))
}));
generics.where_clause = try!(self.parse_where_clause());
try!(self.expect(&token::Semi));
Ok(fields)
}
@@ -5133,18 +5134,6 @@ impl<'a> Parser<'a> {
Ok((ident, ItemTy(ty, tps), None))
}
/// Parse a structure-like enum variant definition
/// this should probably be renamed or refactored...
fn parse_struct_def(&mut self) -> PResult<VariantData> {
let mut fields: Vec<StructField> = Vec::new();
while self.token != token::CloseDelim(token::Brace) {
fields.push(try!(self.parse_struct_decl_field(false)));
}
try!(self.bump());
Ok(VariantData::Struct(fields, ast::DUMMY_NODE_ID))
}
/// Parse the part of an "enum" decl following the '{'
fn parse_enum_def(&mut self, _generics: &ast::Generics) -> PResult<EnumDef> {
let mut variants = Vec::new();
@@ -5157,34 +5146,21 @@ impl<'a> Parser<'a> {
let struct_def;
let mut disr_expr = None;
let ident = try!(self.parse_ident());
if try!(self.eat(&token::OpenDelim(token::Brace)) ){
if self.check(&token::OpenDelim(token::Brace)) {
// Parse a struct variant.
all_nullary = false;
struct_def = try!(self.parse_struct_def());
struct_def = VariantData::Struct(try!(self.parse_record_struct_body(false)),
ast::DUMMY_NODE_ID);
} else if self.check(&token::OpenDelim(token::Paren)) {
all_nullary = false;
let arg_tys = try!(self.parse_enum_variant_seq(
&token::OpenDelim(token::Paren),
&token::CloseDelim(token::Paren),
seq_sep_trailing_allowed(token::Comma),
|p| p.parse_ty_sum()
));
let mut fields = Vec::new();
for ty in arg_tys {
fields.push(Spanned { span: ty.span, node: ast::StructField_ {
ty: ty,
kind: ast::UnnamedField(ast::Inherited),
attrs: Vec::new(),
id: ast::DUMMY_NODE_ID,
}});
}
struct_def = ast::VariantData::Tuple(fields, ast::DUMMY_NODE_ID);
struct_def = VariantData::Tuple(try!(self.parse_tuple_struct_body(false)),
ast::DUMMY_NODE_ID);
} else if try!(self.eat(&token::Eq) ){
disr_expr = Some(try!(self.parse_expr_nopanic()));
any_disr = disr_expr.as_ref().map(|expr| expr.span);
struct_def = ast::VariantData::Unit(ast::DUMMY_NODE_ID);
struct_def = VariantData::Unit(ast::DUMMY_NODE_ID);
} else {
struct_def = ast::VariantData::Unit(ast::DUMMY_NODE_ID);
struct_def = VariantData::Unit(ast::DUMMY_NODE_ID);
}
let vr = ast::Variant_ {