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eval.go
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eval.go
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//
// Copyright © 2018 Aljabr, Inc.
//
// 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.
//
package eval
import (
"github.com/kocircuit/kocircuit/lang/circuit/flow"
"github.com/kocircuit/kocircuit/lang/circuit/model"
"github.com/kocircuit/kocircuit/lang/go/kit/tree"
)
type Evaluator interface {
String() string
EvalPar(*model.Span, *model.Func, Arg) (Return, Effect, error)
EvalSeq(*model.Span, *model.Func, Arg) (Return, Effect, error)
EvalIdiom() model.Repo
EvalRepo() model.Repo
}
func SpanEvaluator(span *model.Span) Evaluator {
return span.Hypervisor.(Evaluator)
}
// Program is an Evaluator.
type Program struct {
Idiom model.Repo `ko:"name=idiom"`
Repo model.Repo `ko:"name=repo"` // function repository from user sources
System `ko:"name=system"`
}
type System struct {
Faculty Faculty `ko:"name=faculty"` // operator logic
Boundary Boundary `ko:"name=boundary"` // interprets literals
Combiner Combiner `ko:"name=combiner"` // generates function effect/description
}
func (prog Program) String() string { return tree.Sprint(prog) }
func (prog Program) EvalIdiom() model.Repo {
return prog.Idiom
}
func (prog Program) EvalRepo() model.Repo {
return prog.Repo
}
func (f evalFlow) StepResidue() *StepResidue {
return &StepResidue{Span: f.Span, Shape: f.Shape, Effect: f.Effect}
}
func FlowResidues(stepFlow []flow.Flow) (stepResidue []*StepResidue) {
stepResidue = make([]*StepResidue, len(stepFlow))
for i, f := range stepFlow {
stepResidue[i] = f.(evalFlow).StepResidue()
}
return
}
// func (prog Program) Eval(span *Span, f *Func, arg Arg) (Return, Effect, error) {
// return prog.EvalSeq(span, f, arg)
// }
func (prog Program) EvalSeq(span *model.Span, f *model.Func, arg Arg) (Return, Effect, error) {
span = span.Attach(prog)
envelope := evalEnvelope{Program: prog, Arg: arg, Span: span}
if returnFlow, stepFlow, err := flow.PlaySeqFlow(span, f, envelope); err != nil {
return nil, nil, err
} else {
returned := returnFlow.(evalFlow).Shape
if eff, err := prog.Combiner.Combine(span, f, arg, returned, FlowResidues(stepFlow)); err != nil {
return nil, nil, err
} else {
return returned, eff, nil
}
}
}
func (prog Program) EvalPar(span *model.Span, f *model.Func, arg Arg) (Return, Effect, error) {
span = span.Attach(prog)
envelope := evalEnvelope{Program: prog, Arg: arg, Span: span}
if returnFlow, stepFlow, err := flow.PlayParFlow(span, f, envelope); err != nil {
return nil, nil, err
} else {
returned := returnFlow.(evalFlow).Shape
if eff, err := prog.Combiner.Combine(span, f, arg, returned, FlowResidues(stepFlow)); err != nil {
return nil, nil, err
} else {
return returned, eff, nil
}
}
}