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use crate::ast::{
ArrayType, FunctionRefType, GenericType, LocalType, NullableType, PlainType, Precedence,
ReferenceType, StructType, Type, VarType,
};
use crate::parser::expression::expression;
use crate::parser::function::function_ref_param;
use crate::parser::identifier::identifier;
use crate::parser::parse_result_ext::ParseResultExt;
use crate::parser::struct_::struct_definition;
use crate::parser::token_list::TokenList;
use crate::parser::token_list_ext::TokenListExt;
use crate::parser::ParseResult;
use crate::token::TerminalToken;
use crate::{ContextType, ParseErrorType};
pub fn type_(tokens: TokenList) -> ParseResult<Type> {
let (mut next_tokens, mut type_) = base(tokens)?;
loop {
let mut type_container = Some(type_);
match modifier(next_tokens, TypeRef(&mut type_container))
.with_context_from(ContextType::Type, tokens)
.maybe(next_tokens)?
{
(new_tokens, Some(new_type)) => {
next_tokens = new_tokens;
type_ = new_type;
}
(new_tokens, None) => return Ok((new_tokens, type_container.unwrap())),
}
}
}
fn base(tokens: TokenList) -> ParseResult<Type> {
local(tokens)
.map_val(Type::Local)
.or_try(|| var(tokens).map_val(Type::Var))
.or_try(|| plain(tokens).map_val(Type::Plain))
.or_try(|| void_function_ref(tokens).map_val(Type::FunctionRef))
.or_try(|| struct_(tokens).map_val(Type::Struct))
.or_error(|| tokens.error(ParseErrorType::ExpectedType))
}
pub fn local(tokens: TokenList) -> ParseResult<LocalType> {
tokens
.terminal(TerminalToken::Local)
.map_val(|local| LocalType { local })
}
pub fn var(tokens: TokenList) -> ParseResult<VarType> {
tokens
.terminal(TerminalToken::Var)
.map_val(|var| VarType { var })
}
pub fn plain(tokens: TokenList) -> ParseResult<PlainType> {
identifier(tokens).map_val(|name| PlainType { name })
}
pub fn void_function_ref(tokens: TokenList) -> ParseResult<FunctionRefType> {
function_ref(tokens, || None)
}
pub fn struct_(tokens: TokenList) -> ParseResult<StructType> {
tokens
.terminal(TerminalToken::Struct)
.determines(|tokens, struct_| {
struct_definition(tokens).map_val(|definition| StructType {
struct_,
definition,
})
})
}
struct TypeRef<'a, 's>(&'a mut Option<Type<'s>>);
impl<'a, 's> TypeRef<'a, 's> {
fn take(self) -> Type<'s> {
self.0.take().unwrap()
}
}
fn modifier<'s>(tokens: TokenList<'s>, left: TypeRef<'_, 's>) -> ParseResult<'s, Type<'s>> {
let left_ref = left.0;
array(tokens, TypeRef(left_ref))
.map_val(Type::Array)
.or_try(|| generic(tokens, TypeRef(left_ref)).map_val(Type::Generic))
.or_try(|| typed_function_ref(tokens, TypeRef(left_ref)).map_val(Type::FunctionRef))
.or_try(|| reference(tokens, TypeRef(left_ref)).map_val(Type::Reference))
.or_try(|| nullable(tokens, TypeRef(left_ref)).map_val(Type::Nullable))
.or_error(|| tokens.error(ParseErrorType::ExpectedTypeModifier))
}
fn array<'s>(tokens: TokenList<'s>, left: TypeRef<'_, 's>) -> ParseResult<'s, ArrayType<'s>> {
tokens.terminal(TerminalToken::OpenSquare).opens(
ContextType::Expression,
|tokens| tokens.terminal(TerminalToken::CloseSquare),
|tokens, open, close| {
expression(tokens, Precedence::None).map_val(|len| ArrayType {
base: Box::new(left.take()),
open,
len,
close,
})
},
)
}
fn generic<'s>(tokens: TokenList<'s>, left: TypeRef<'_, 's>) -> ParseResult<'s, GenericType<'s>> {
tokens
.terminal(TerminalToken::Less)
.determines(|tokens, open| {
let (tokens, params) = tokens
.separated_list_trailing1(type_, |tokens| tokens.terminal(TerminalToken::Comma))?;
let (tokens, close) = tokens.terminal(TerminalToken::Greater)?;
Ok((
tokens,
GenericType {
base: Box::new(left.take()),
open,
params,
close,
},
))
})
.with_context_from(ContextType::GenericArgumentList, tokens)
}
fn typed_function_ref<'s>(
tokens: TokenList<'s>,
left: TypeRef<'_, 's>,
) -> ParseResult<'s, FunctionRefType<'s>> {
function_ref(tokens, || Some(left.take()))
}
fn reference<'s>(
tokens: TokenList<'s>,
left: TypeRef<'_, 's>,
) -> ParseResult<'s, ReferenceType<'s>> {
tokens
.terminal(TerminalToken::BitwiseAnd)
.map_val(|reference| ReferenceType {
base: Box::new(left.take()),
reference,
})
}
fn nullable<'s>(tokens: TokenList<'s>, left: TypeRef<'_, 's>) -> ParseResult<'s, NullableType<'s>> {
tokens
.terminal(TerminalToken::OrNull)
.map_val(|ornull| NullableType {
base: Box::new(left.take()),
ornull,
})
}
fn function_ref<'s>(
tokens: TokenList<'s>,
return_type: impl FnOnce() -> Option<Type<'s>>,
) -> ParseResult<'s, FunctionRefType<'s>> {
tokens
.terminal(TerminalToken::FunctionRef)
.determines(|tokens, functionref| {
let (tokens, (open, params, close)) =
tokens.terminal(TerminalToken::OpenBracket).opens(
ContextType::Span,
|tokens| tokens.terminal(TerminalToken::CloseBracket),
|tokens, open, close| {
tokens
.separated_list_trailing0(function_ref_param, |tokens| {
tokens.terminal(TerminalToken::Comma)
})
.map_val(|params| (open, params, close))
},
)?;
Ok((
tokens,
FunctionRefType {
return_type: return_type().map(Box::new),
functionref,
open,
params,
close,
},
))
})
}