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v/vlib/compiler/enum.v

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// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module compiler
fn (p mut Parser) enum_decl(no_name bool) {
is_pub := p.tok == .key_pub
if is_pub {
p.next()
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p.fspace()
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}
p.check(.key_enum)
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p.fspace()
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mut enum_name := p.check_name()
is_c := enum_name == 'C' && p.tok == .dot
if is_c {
p.check(.dot)
enum_name = p.check_name()
}
// Specify full type name
if !p.builtin_mod && p.mod != 'main' {
enum_name = p.prepend_mod(enum_name)
}
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p.fspace()
p.check(.lcbr)
mut val := 0
mut fields := []string
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mut tuple_variants := []string
for p.tok == .name {
field := p.check_name()
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if p.pass == .decl && p.tok != .lpar && contains_capital(field) {
p.warn('enum values cannot contain uppercase letters, use snake_case instead (`$field`)')
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}
fields << field
name := '${mod_gen_name(p.mod)}__${enum_name}_$field'
if p.tok == .assign {
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p.fspace()
mut enum_assign_tidx := p.cur_tok_index()
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next := p.peek()
if next in [.number, .minus] {
p.next()
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p.fspace()
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is_neg := p.tok == .minus
if is_neg {
p.next()
}
val = p.lit.int()
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if is_neg {
val = -val
}
p.next()
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}
else {
p.next()
enum_assign_tidx = p.cur_tok_index()
p.error_with_token_index('only numbers are allowed in enum initializations', enum_assign_tidx)
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}
}
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// `BoolExpr(bool)`
else if p.tok == .lpar {
if !field[0].is_capital() {
p.error('sum types must be capitalized')
}
p.check(.lpar)
tuple_variants << p.get_type()
p.check(.rpar)
if p.pass == .main {
p.cgen.consts << '#define ${field}_type $val // LOL'
}
}
if p.pass == .main {
p.cgen.consts << '#define $name $val'
}
if p.tok == .comma {
p.next()
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p.fremove_last()
}
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p.fgen_nl()
val++
}
is_flag := p.attr == 'flag'
if is_flag && fields.len > 32 {
p.error('when an enum is used as bit field, it must have a max of 32 fields')
}
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mut T := Type{
name: enum_name
mod: p.mod
parent: 'int'
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cat: .enum_
enum_vals: fields.clone()
is_public: is_pub
is_flag: is_flag
}
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p.table.tuple_variants[enum_name] = tuple_variants
if is_flag && !p.first_pass() {
p.gen_enum_flag_methods(mut T)
}
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if p.pass == .decl || is_flag {
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p.table.register_type(T)
}
// Register `Expression` enum
if tuple_variants.len > 0 && p.pass == .main {
p.cgen.typedefs << 'typedef struct {
void* obj;
int typ;
} $enum_name;
'
}
// Skip nameless enums
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else if !no_name && !p.first_pass() {
p.cgen.typedefs << 'typedef int $enum_name;'
}
p.check(.rcbr)
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p.fgen_nl()
p.fgen_nl()
if !no_name && fields.len == 0 {
p.error('Empty enums are not allowed.')
}
}
fn (p mut Parser) check_enum_member_access() {
T := p.find_type(p.expected_type)
if T.cat == .enum_ {
p.check(.dot)
val := p.check_name()
// Make sure this enum value exists
if !T.has_enum_val(val) {
p.error('enum `$T.name` does not have value `$val`')
}
p.gen(mod_gen_name(T.mod) + '__' + p.expected_type + '_' + val)
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}
else {
p.error('`$T.name` is not an enum')
}
}
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/*
enum Expression {
Boolean(bool),
Integer(i32),
}
fn main() {
let expr = Expression::Integer(10);
let mut val = Expression::Boolean(true);
val = expr;
match val {
Expression::Integer(n) => println!("INT {}", n),
Expression::Boolean(b) => println!("BOOL {}", b),
}
//println!("HELLO {}", val);
}
*/