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parser: type Foo = Bar

pull/4387/head
Alexander Medvednikov 2020-04-13 15:06:02 +02:00
parent 77fcd572dc
commit 2bd22aa4a4
1 changed files with 17 additions and 12 deletions
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29
vlib/v/parser/parser.v
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@ -1969,8 +1969,23 @@ fn (p mut Parser) type_decl() ast.TypeDecl {
name := p.check_name()
mut sum_variants := []table.Type
if p.tok.kind == .assign {
p.next() // TODO require `=`
}
if p.tok.kind == .key_fn {
// function type: `type mycallback fn(string, int)`
fn_name := p.prepend_mod(name)
fn_type := p.parse_fn_type(fn_name)
return ast.FnTypeDecl{
name: fn_name
is_pub: is_pub
typ: fn_type
}
}
first_type := p.parse_type() // need to parse the first type before we can check if it's `type A = X | Y`
if p.tok.kind == .pipe {
p.check(.pipe)
sum_variants << first_type
// type SumType = A | B | c
p.next()
for {
variant_type := p.parse_type()
sum_variants << variant_type
@ -1992,18 +2007,8 @@ fn (p mut Parser) type_decl() ast.TypeDecl {
sub_types: sum_variants
}
}
// function type: `type mycallback fn(string, int)`
if p.tok.kind == .key_fn {
fn_name := p.prepend_mod(name)
fn_type := p.parse_fn_type(fn_name)
return ast.FnTypeDecl{
name: fn_name
is_pub: is_pub
typ: fn_type
}
}
// type MyType int
parent_type := p.parse_type()
parent_type := first_type
pid := table.type_idx(parent_type)
p.table.register_type_symbol(table.TypeSymbol{
kind: .alias