14577a0c46
This adds a modern type unification algorithm, which drastically improves performance, particularly for bigger programs. This required a change to the AST to add TypeCheck methods (for Stmt) and Infer/Check methods (for Expr). This also changed how the functions express their invariants, and as a result this was changed as well. This greatly improves the way we express these invariants, and as a result it makes adding new polymorphic functions significantly easier. This also makes error output for the user a lot better in pretty much all scenarios. The one downside of this patch is that a good chunk of it is merged in this giant single commit since it was hard to do it step-wise. That's not the end of the world. This couldn't be done without the guidance of Sam who helped me in explaining, debugging, and writing all the sneaky algorithmic parts and much more. Thanks again Sam! Co-authored-by: Samuel Gélineau <gelisam@gmail.com>
99 lines
3.6 KiB
Go
99 lines
3.6 KiB
Go
// Mgmt
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// Copyright (C) 2013-2024+ 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 coremath
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import (
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"context"
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"fmt"
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"github.com/purpleidea/mgmt/lang/funcs/multi"
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"github.com/purpleidea/mgmt/lang/interfaces"
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"github.com/purpleidea/mgmt/lang/types"
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)
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func init() {
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typInt := types.NewType("func() int")
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typFloat := types.NewType("func() float")
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multi.ModuleRegister(ModuleName, "fortytwo", &multi.Scaffold{
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T: types.NewType("func() ?1"),
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M: multi.TypeMatch(map[string]interfaces.FuncSig{
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"func() int": fortyTwo(typInt),
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"func() float": fortyTwo(typFloat),
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}),
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//M: func(typ *types.Type) (interfaces.FuncSig, error) {
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// if typ == nil {
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// return nil, fmt.Errorf("nil type")
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// }
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// if typ.Kind != types.KindFunc {
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// return nil, fmt.Errorf("not a func")
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// }
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// if len(typ.Map) != 0 || len(typ.Ord) != 0 {
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// return nil, fmt.Errorf("arg count wrong")
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// }
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// if err := typ.Out.Cmp(types.TypeInt); err == nil {
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// return fortyTwo(typInt), nil
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// }
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// if err := typ.Out.Cmp(types.TypeFloat); err == nil {
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// return fortyTwo(typFloat), nil
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// }
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// return nil, fmt.Errorf("can't use return type of: %s", typ.Out)
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//},
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})
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}
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// fortyTwo is a helper function to build the correct function for the desired
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// signature, because the multi func API doesn't tell the implementing function
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// what its signature should be! In the next version of this API, we could pass
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// in a sig field, like how we demonstrate in the implementation of FortyTwo. If
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// the API doesn't change, then this is an example of how to build this as a
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// wrapper.
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func fortyTwo(sig *types.Type) interfaces.FuncSig {
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return func(ctx context.Context, input []types.Value) (types.Value, error) {
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return FortyTwo(sig, input)
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}
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}
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// FortyTwo returns 42 as either an int or a float. This is not especially
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// useful, but was built for a fun test case of a simple poly function with two
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// different return types, but no input args.
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func FortyTwo(sig *types.Type, input []types.Value) (types.Value, error) {
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if sig.Out.Kind == types.KindInt {
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return &types.IntValue{
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V: 42,
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}, nil
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}
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if sig.Out.Kind == types.KindFloat {
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return &types.FloatValue{
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V: 42.0,
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}, nil
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}
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return nil, fmt.Errorf("unknown output type: %+v", sig.Out)
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}
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