d30ff6cfae
Instead of constantly making these updates, let's just remove the year since things are stored in git anyways, and this is not an actual modern legal risk anymore.
75 lines
3.0 KiB
Go
75 lines
3.0 KiB
Go
// Mgmt
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// Copyright (C) James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//
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// Additional permission under GNU GPL version 3 section 7
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//
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// If you modify this program, or any covered work, by linking or combining it
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// with embedded mcl code and modules (and that the embedded mcl code and
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// modules which link with this program, contain a copy of their source code in
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// the authoritative form) containing parts covered by the terms of any other
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// license, the licensors of this program grant you additional permission to
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// convey the resulting work. Furthermore, the licensors of this program grant
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// the original author, James Shubin, additional permission to update this
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// additional permission if he deems it necessary to achieve the goals of this
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// additional permission.
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package interfaces
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import (
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"github.com/purpleidea/mgmt/lang/types"
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)
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// UnificationInvariant is the only type of invariant that we currently support.
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// It always lets you specify an `Expr` so that we know what we're referring to.
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// It always lets you specify two types which must get unified for a successful
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// solution. Those two types are symmetrical in that it doesn't matter which is
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// used where, it only affects how we print out error messages.
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type UnificationInvariant struct { // formerly the SamInvariant
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// Expr is the expression we are determining the type for. This improves
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// our error messages.
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Expr Expr
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// Expect is one of the two types to unify.
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Expect *types.Type
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// Actual is one of the two types to unify.
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Actual *types.Type
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}
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// GenericCheck is the generic implementation of the Check Expr interface call.
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// It is checking that the input type is equal to the object that Check is
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// running on. In doing so, it adds any invariants that are necessary. Check
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// must always call Infer to produce the invariant. The implementation can be
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// generic for all expressions.
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func GenericCheck(obj Expr, typ *types.Type) ([]*UnificationInvariant, error) {
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// Generic implementation of Check:
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// This wants to be inferred, because it always knows its type.
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actual, invariants, err := obj.Infer()
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if err != nil {
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return nil, err
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}
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invar := &UnificationInvariant{
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Expr: obj,
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Expect: typ, // sam says not backwards
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Actual: actual,
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}
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invariants = append(invariants, invar)
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return invariants, nil
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}
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