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use std::io::Error as IOError;
use crate::semantics::core::context::TypecheckContext;
use crate::semantics::core::value::Value;
use crate::semantics::phase::resolve::ImportStack;
use crate::semantics::phase::NormalizedExpr;
use crate::syntax::{BinOp, Import, Label, ParseError, Span};
pub type Result<T> = std::result::Result<T, Error>;
#[derive(Debug)]
#[non_exhaustive]
pub enum Error {
IO(IOError),
Parse(ParseError),
Decode(DecodeError),
Encode(EncodeError),
Resolve(ImportError),
Typecheck(TypeError),
}
#[derive(Debug)]
pub enum ImportError {
Recursive(Import<NormalizedExpr>, Box<Error>),
UnexpectedImport(Import<NormalizedExpr>),
ImportCycle(ImportStack, Import<NormalizedExpr>),
}
#[derive(Debug)]
pub enum DecodeError {
CBORError(serde_cbor::error::Error),
WrongFormatError(String),
}
#[derive(Debug)]
pub enum EncodeError {
CBORError(serde_cbor::error::Error),
}
/// A structured type error that includes context
#[derive(Debug)]
pub struct TypeError {
message: TypeMessage,
context: TypecheckContext,
}
/// The specific type error
#[derive(Debug)]
pub(crate) enum TypeMessage {
UnboundVariable(Span),
InvalidInputType(Value),
InvalidOutputType(Value),
NotAFunction(Value),
TypeMismatch(Value, Value, Value),
AnnotMismatch(Value, Value),
InvalidListElement(usize, Value, Value),
InvalidListType(Value),
InvalidOptionalType(Value),
InvalidPredicate(Value),
IfBranchMismatch(Value, Value),
IfBranchMustBeTerm(bool, Value),
InvalidFieldType(Label, Value),
NotARecord(Label, Value),
MustCombineRecord(Value),
MissingRecordField(Label, Value),
MissingUnionField(Label, Value),
BinOpTypeMismatch(BinOp, Value),
InvalidTextInterpolation(Value),
Merge1ArgMustBeRecord(Value),
Merge2ArgMustBeUnionOrOptional(Value),
MergeEmptyNeedsAnnotation,
MergeHandlerMissingVariant(Label),
MergeVariantMissingHandler(Label),
MergeAnnotMismatch,
MergeHandlerTypeMismatch,
MergeHandlerReturnTypeMustNotBeDependent,
ProjectionMustBeRecord,
ProjectionMissingEntry,
ProjectionDuplicateField,
Sort,
RecordTypeDuplicateField,
RecordTypeMergeRequiresRecordType(Value),
UnionTypeDuplicateField,
EquivalenceArgumentMustBeTerm(bool, Value),
EquivalenceTypeMismatch(Value, Value),
AssertMismatch(Value, Value),
AssertMustTakeEquivalence,
}
impl TypeError {
pub(crate) fn new(
context: &TypecheckContext,
message: TypeMessage,
) -> Self {
TypeError {
context: context.clone(),
message,
}
}
}
impl std::fmt::Display for TypeError {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
use TypeMessage::*;
let msg = match &self.message {
UnboundVariable(span) => span.error("Type error: Unbound variable"),
InvalidInputType(v) => {
v.span().error("Type error: Invalid function input")
}
InvalidOutputType(v) => {
v.span().error("Type error: Invalid function output")
}
NotAFunction(v) => v.span().error("Type error: Not a function"),
TypeMismatch(x, y, z) => {
x.span()
.error("Type error: Wrong type of function argument")
+ "\n"
+ &z.span().error(format!(
"This argument has type {:?}",
z.get_type().unwrap()
))
+ "\n"
+ &y.span().error(format!(
"But the function expected an argument of type {:?}",
y
))
}
_ => format!("Type error: Unhandled error: {:?}", self.message),
};
write!(f, "{}", msg)
}
}
impl std::error::Error for TypeError {}
impl std::fmt::Display for Error {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
match self {
Error::IO(err) => write!(f, "{}", err),
Error::Parse(err) => write!(f, "{}", err),
Error::Decode(err) => write!(f, "{:?}", err),
Error::Encode(err) => write!(f, "{:?}", err),
Error::Resolve(err) => write!(f, "{:?}", err),
Error::Typecheck(err) => write!(f, "{}", err),
}
}
}
impl std::error::Error for Error {}
impl From<IOError> for Error {
fn from(err: IOError) -> Error {
Error::IO(err)
}
}
impl From<ParseError> for Error {
fn from(err: ParseError) -> Error {
Error::Parse(err)
}
}
impl From<DecodeError> for Error {
fn from(err: DecodeError) -> Error {
Error::Decode(err)
}
}
impl From<EncodeError> for Error {
fn from(err: EncodeError) -> Error {
Error::Encode(err)
}
}
impl From<ImportError> for Error {
fn from(err: ImportError) -> Error {
Error::Resolve(err)
}
}
impl From<TypeError> for Error {
fn from(err: TypeError) -> Error {
Error::Typecheck(err)
}
}
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