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use super::{FunctionDeclaration, FunctionParameter, Visibility};
use crate::build_config::BuildConfig;
use crate::parse_tree::TypeParameter;
use crate::parser::Rule;
use crate::span::Span;
use crate::style::{is_snake_case, is_upper_camel_case};
use crate::type_engine::TypeInfo;
use crate::{error::*, Ident};
use pest::iterators::Pair;
#[derive(Debug, Clone)]
pub struct TraitDeclaration {
pub name: Ident,
pub(crate) interface_surface: Vec<TraitFn>,
pub(crate) methods: Vec<FunctionDeclaration>,
pub(crate) type_parameters: Vec<TypeParameter>,
pub visibility: Visibility,
}
impl TraitDeclaration {
pub(crate) fn parse_from_pair(
pair: Pair<Rule>,
config: Option<&BuildConfig>,
) -> CompileResult<Self> {
let mut warnings = Vec::new();
let mut errors = Vec::new();
let mut trait_parts = pair.into_inner().peekable();
let trait_keyword_or_visibility = trait_parts.next().unwrap();
let (visibility, _trait_keyword) =
if trait_keyword_or_visibility.as_rule() == Rule::visibility {
(
Visibility::parse_from_pair(trait_keyword_or_visibility),
trait_parts.next().unwrap(),
)
} else {
(Visibility::Private, trait_keyword_or_visibility)
};
let name_pair = trait_parts.next().unwrap();
let name = check!(
Ident::parse_from_pair(name_pair.clone(), config),
return err(warnings, errors),
warnings,
errors
);
let span = name.span().clone();
assert_or_warn!(
is_upper_camel_case(name_pair.as_str().trim()),
warnings,
span,
Warning::NonClassCaseTraitName { name: name.clone() }
);
let mut type_params_pair = None;
let mut where_clause_pair = None;
let mut methods = Vec::new();
let mut interface = Vec::new();
for _ in 0..2 {
match trait_parts.peek().map(|x| x.as_rule()) {
Some(Rule::trait_bounds) => {
where_clause_pair = Some(trait_parts.next().unwrap());
}
Some(Rule::type_params) => {
type_params_pair = Some(trait_parts.next().unwrap());
}
_ => (),
}
}
if let Some(methods_and_interface) = trait_parts.next() {
for fn_sig_or_decl in methods_and_interface.into_inner() {
match fn_sig_or_decl.as_rule() {
Rule::fn_signature => {
interface.push(check!(
TraitFn::parse_from_pair(fn_sig_or_decl, config),
continue,
warnings,
errors
));
}
Rule::fn_decl => {
methods.push(check!(
FunctionDeclaration::parse_from_pair(fn_sig_or_decl, config),
continue,
warnings,
errors
));
}
a => unreachable!("{:?}", a),
}
}
}
let type_parameters =
crate::parse_tree::declaration::TypeParameter::parse_from_type_params_and_where_clause(
type_params_pair,
where_clause_pair,
config,
)
.unwrap_or_else(&mut warnings, &mut errors, Vec::new);
ok(
TraitDeclaration {
type_parameters,
name,
interface_surface: interface,
methods,
visibility,
},
warnings,
errors,
)
}
}
#[derive(Debug, Clone, Eq, PartialEq)]
pub(crate) struct TraitFn {
pub(crate) name: Ident,
pub(crate) parameters: Vec<FunctionParameter>,
pub(crate) return_type: TypeInfo,
pub(crate) return_type_span: Span,
}
impl TraitFn {
pub(crate) fn parse_from_pair(
pair: Pair<Rule>,
config: Option<&BuildConfig>,
) -> CompileResult<Self> {
let path = config.map(|c| c.path());
let mut warnings = Vec::new();
let mut errors = Vec::new();
let mut signature = pair.clone().into_inner();
let whole_fn_sig_span = Span {
span: pair.as_span(),
path: path.clone(),
};
let _fn_keyword = signature.next().unwrap();
let name = signature.next().unwrap();
let name_span = Span {
span: name.as_span(),
path: path.clone(),
};
let name = check!(
Ident::parse_from_pair(name, config),
return err(warnings, errors),
warnings,
errors
);
assert_or_warn!(
is_snake_case(name.as_str()),
warnings,
name_span,
Warning::NonSnakeCaseFunctionName { name: name.clone() }
);
let parameters = signature.next().unwrap();
let parameters = check!(
FunctionParameter::list_from_pairs(parameters.into_inner(), config),
Vec::new(),
warnings,
errors
);
let return_type_signal = signature.next();
let (return_type, return_type_span) = match return_type_signal {
Some(_) => {
let pair = signature.next().unwrap();
let span = Span {
span: pair.as_span(),
path,
};
(
check!(
TypeInfo::parse_from_pair(pair, config),
TypeInfo::ErrorRecovery,
warnings,
errors
),
span,
)
}
None => (TypeInfo::Tuple(Vec::new()), whole_fn_sig_span),
};
ok(
TraitFn {
name,
parameters,
return_type,
return_type_span,
},
warnings,
errors,
)
}
}
