mentat/query-algebrizer-traits/errors.rs
2018-08-09 13:13:35 -07:00

108 lines
3.8 KiB
Rust

// Copyright 2016 Mozilla
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
use std; // To refer to std::result::Result.
use core_traits::{
ValueType,
ValueTypeSet,
};
use edn::parse::{
ParseError,
};
use edn::query::{
PlainSymbol,
};
pub type Result<T> = std::result::Result<T, AlgebrizerError>;
#[derive(Clone, Debug, Eq, PartialEq)]
pub enum BindingError {
NoBoundVariable,
UnexpectedBinding,
RepeatedBoundVariable, // TODO: include repeated variable(s).
/// Expected `[[?x ?y]]` but got some other type of binding. Mentat is deliberately more strict
/// than Datomic: we won't try to make sense of non-obvious (and potentially erroneous) bindings.
ExpectedBindRel,
/// Expected `[[?x ?y]]` or `[?x ...]` but got some other type of binding. Mentat is
/// deliberately more strict than Datomic: we won't try to make sense of non-obvious (and
/// potentially erroneous) bindings.
ExpectedBindRelOrBindColl,
/// Expected `[?x1 … ?xN]` or `[[?x1 … ?xN]]` but got some other number of bindings. Mentat is
/// deliberately more strict than Datomic: we prefer placeholders to omission.
InvalidNumberOfBindings { number: usize, expected: usize },
}
#[derive(Clone, Debug, Eq, Fail, PartialEq)]
pub enum AlgebrizerError {
#[fail(display = "{} var {} is duplicated", _0, _1)]
DuplicateVariableError(PlainSymbol, &'static str),
#[fail(display = "unexpected FnArg")]
UnsupportedArgument,
#[fail(display = "value of type {} provided for var {}, expected {}", _0, _1, _2)]
InputTypeDisagreement(PlainSymbol, ValueType, ValueType),
#[fail(display = "invalid number of arguments to {}: expected {}, got {}.", _0, _1, _2)]
InvalidNumberOfArguments(PlainSymbol, usize, usize),
#[fail(display = "invalid argument to {}: expected {} in position {}.", _0, _1, _2)]
InvalidArgument(PlainSymbol, &'static str, usize),
#[fail(display = "invalid argument to {}: expected one of {:?} in position {}.", _0, _1, _2)]
InvalidArgumentType(PlainSymbol, ValueTypeSet, usize),
// TODO: flesh this out.
#[fail(display = "invalid expression in ground constant")]
InvalidGroundConstant,
#[fail(display = "invalid limit {} of type {}: expected natural number.", _0, _1)]
InvalidLimit(String, ValueType),
#[fail(display = "mismatched bindings in ground")]
GroundBindingsMismatch,
#[fail(display = "no entid found for ident: {}", _0)]
UnrecognizedIdent(String),
#[fail(display = "no function named {}", _0)]
UnknownFunction(PlainSymbol),
#[fail(display = ":limit var {} not present in :in", _0)]
UnknownLimitVar(PlainSymbol),
#[fail(display = "unbound variable {} in order clause or function call", _0)]
UnboundVariable(PlainSymbol),
// TODO: flesh out.
#[fail(display = "non-matching variables in 'or' clause")]
NonMatchingVariablesInOrClause,
#[fail(display = "non-matching variables in 'not' clause")]
NonMatchingVariablesInNotClause,
#[fail(display = "binding error in {}: {:?}", _0, _1)]
InvalidBinding(PlainSymbol, BindingError),
#[fail(display = "{}", _0)]
EdnParseError(#[cause] ParseError),
}
impl From<ParseError> for AlgebrizerError {
fn from(error: ParseError) -> AlgebrizerError {
AlgebrizerError::EdnParseError(error)
}
}