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