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use super::Parser;
use smallvec::SmallVec;
use xjbutil::defer;
use crate::diag::location::SourceRange;
use crate::parse::lexer::LexerMode;
use crate::syntax::id::Identifier;
use crate::syntax::token::{Token, TokenInner};
use crate::syntax::ty::{ConcreteGenericType, ConcreteType};
impl<'s, 'd> Parser<'s, 'd> {
pub fn parse_type(&mut self, failsafe_set: &[&[TokenInner<'_>]]) -> Option<ConcreteType<'s>> {
let this: &mut Parser<'s, 'd> = self;
defer!(|this: &mut Parser<'s, 'd>| {
this.lexer.pop_lexer_mode()
}, this);
this.lexer.push_lexer_mode(LexerMode::LexType);
this.parse_type_impl(failsafe_set)
}
fn parse_type_impl(&mut self, failsafe_set: &[&[TokenInner<'_>]]) -> Option<ConcreteType<'s>> {
match self.current_token().token_inner {
TokenInner::KwdAny | TokenInner::KwdBool | TokenInner::KwdChar |
TokenInner::KwdFloat | TokenInner::KwdInt | TokenInner::KwdObject |
TokenInner::KwdString | TokenInner::KwdVoid => {
Some(ConcreteType::PrimitiveType(self.consume_token()))
},
TokenInner::KwdVector => {
let container_type_token: Token<'s> = self.consume_token();
self.parse_generic_type(container_type_token, failsafe_set)
},
TokenInner::KwdAuto => {
Some(ConcreteType::DeducedType(self.consume_token().range))
},
TokenInner::Ident(_) => {
let ident: Identifier<'s> = self.parse_ident().or_else(|| {
self.skip_to_any_of(failsafe_set);
None
})?;
Some(ConcreteType::UserType(ident))
},
_ => {
eprintln!("{:?}", self.current_token());
todo!()
}
}
}
pub fn parse_generic_type(
&mut self,
container_type_token: Token<'s>,
failsafe_set: &[&[TokenInner<'_>]]
) -> Option<ConcreteType<'s>> {
debug_assert_eq!(container_type_token.token_inner, TokenInner::KwdVector);
let left_angle_range: SourceRange =
self.expect_n_consume(TokenInner::SymLt, failsafe_set)?.range;
let (type_param_list, right_angle_range): (SmallVec<[ConcreteType<'s>; 2]>, SourceRange) =
self.parse_list_alike_nonnull(
Self::parse_type,
failsafe_set,
TokenInner::SymComma,
TokenInner::SymGt,
failsafe_set
)?;
Some(ConcreteType::GenericType(Box::new(
ConcreteGenericType {
base: container_type_token,
inner: type_param_list,
left_angle: left_angle_range.left(),
right_angle: right_angle_range.right()
}
)))
}
}
#[cfg(test)]
mod test {
use std::cell::RefCell;
use crate::diag::DiagContext;
use crate::parse::parser::Parser;
use crate::syntax::id::assert_ident_qual;
use crate::syntax::token::TokenInner;
use crate::syntax::ty::ConcreteType;
fn test_primitive_type(ty: &ConcreteType, token_inner: TokenInner) {
if let ConcreteType::PrimitiveType(token) = ty {
assert_eq!(token.token_inner, token_inner);
} else {
panic!("shoud be a primitive type")
}
}
#[test]
fn test_parse_primitive_type() {
let source: &str = "any bool char float int object string void";
let diag: RefCell<DiagContext> = RefCell::new(DiagContext::new());
let mut parser: Parser = Parser::new(
0, source, &diag
);
{
use TokenInner::*;
for token_inner in [
KwdAny, KwdBool, KwdChar, KwdFloat, KwdInt, KwdObject, KwdString, KwdVoid
] {
let ty: ConcreteType = parser.parse_type(&[]).unwrap();
test_primitive_type(&ty, token_inner);
}
}
assert!(!diag.borrow().has_error());
}
#[test]
fn test_parse_deduced_type() {
let source: &str = "auto";
let diag: RefCell<DiagContext> = RefCell::new(DiagContext::new());
let mut parser: Parser = Parser::new(
0, source, &diag
);
if let ConcreteType::DeducedType(_) = parser.parse_type(&[]).unwrap() {} else {
panic!("should be a deduced type")
}
}
#[test]
fn test_parse_generic_type() {
let source: &str = "vector<vector<string>, std::char_traits, int>";
let diag: RefCell<DiagContext> = RefCell::new(DiagContext::new());
let mut parser: Parser = Parser::new(
0, source, &diag
);
let ty: ConcreteType = parser.parse_type(&[]).unwrap();
if let ConcreteType::GenericType(generic_type) = ty {
assert_eq!(generic_type.base.token_inner, TokenInner::KwdVector);
assert_eq!(generic_type.inner.len(), 3);
if let ConcreteType::GenericType(generic_type) = &generic_type.inner[0] {
assert_eq!(generic_type.base.token_inner, TokenInner::KwdVector);
assert_eq!(generic_type.inner.len(), 1);
test_primitive_type(&generic_type.inner[0], TokenInner::KwdString);
} else {
panic!("should be a generic type");
}
if let ConcreteType::UserType(ident) = &generic_type.inner[1] {
assert_ident_qual(&ident, &["std", "char_traits"]);
} else {
panic!("should be a user type");
}
test_primitive_type(&generic_type.inner[2], TokenInner::KwdInt);
} else {
panic!("should be a generic type");
}
}
}