88 lines
3.4 KiB
Rust
88 lines
3.4 KiB
Rust
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// 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 mentat_core::{
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TypedValue,
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};
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use mentat_query::{
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FnArg,
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NonIntegerConstant,
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PlainSymbol,
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};
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use clauses::ConjoiningClauses;
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use errors::{
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Result,
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Error,
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ErrorKind,
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};
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use types::{
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EmptyBecause,
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QueryValue,
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};
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/// Argument resolution.
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impl ConjoiningClauses {
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/// Take a function argument and turn it into a `QueryValue` suitable for use in a concrete
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/// constraint.
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/// Additionally, do two things:
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/// - Mark the pattern as known-empty if any argument is known non-numeric.
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/// - Mark any variables encountered as numeric.
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pub fn resolve_numeric_argument(&mut self, function: &PlainSymbol, position: usize, arg: FnArg) -> Result<QueryValue> {
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use self::FnArg::*;
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match arg {
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FnArg::Variable(var) => {
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self.constrain_var_to_numeric(var.clone());
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self.column_bindings
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.get(&var)
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.and_then(|cols| cols.first().map(|col| QueryValue::Column(col.clone())))
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.ok_or_else(|| Error::from_kind(ErrorKind::UnboundVariable(var)))
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},
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// Can't be an entid.
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EntidOrInteger(i) => Ok(QueryValue::TypedValue(TypedValue::Long(i))),
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Ident(_) |
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SrcVar(_) |
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Constant(NonIntegerConstant::Boolean(_)) |
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Constant(NonIntegerConstant::Text(_)) |
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Constant(NonIntegerConstant::BigInteger(_)) => {
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self.mark_known_empty(EmptyBecause::NonNumericArgument);
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bail!(ErrorKind::NonNumericArgument(function.clone(), position));
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},
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Constant(NonIntegerConstant::Float(f)) => Ok(QueryValue::TypedValue(TypedValue::Double(f))),
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}
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}
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/// Take a function argument and turn it into a `QueryValue` suitable for use in a concrete
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/// constraint.
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#[allow(dead_code)]
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fn resolve_argument(&self, arg: FnArg) -> Result<QueryValue> {
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use self::FnArg::*;
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match arg {
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FnArg::Variable(var) => {
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self.column_bindings
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.get(&var)
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.and_then(|cols| cols.first().map(|col| QueryValue::Column(col.clone())))
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.ok_or_else(|| Error::from_kind(ErrorKind::UnboundVariable(var)))
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},
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EntidOrInteger(i) => Ok(QueryValue::PrimitiveLong(i)),
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Ident(_) => unimplemented!(), // TODO
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Constant(NonIntegerConstant::Boolean(val)) => Ok(QueryValue::TypedValue(TypedValue::Boolean(val))),
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Constant(NonIntegerConstant::Float(f)) => Ok(QueryValue::TypedValue(TypedValue::Double(f))),
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Constant(NonIntegerConstant::Text(s)) => Ok(QueryValue::TypedValue(TypedValue::String(s.clone()))),
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Constant(NonIntegerConstant::BigInteger(_)) => unimplemented!(),
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SrcVar(_) => unimplemented!(),
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}
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}
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}
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