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select.go
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select.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 symbol
import (
"github.com/kocircuit/kocircuit/lang/circuit/eval"
"github.com/kocircuit/kocircuit/lang/circuit/model"
)
func (ss *StructSymbol) GetMonadic() (Symbol, bool) {
for _, field := range ss.Field {
if field.Monadic {
return field.Value, true
}
}
return nil, false
}
func (ss *StructSymbol) Link(span *model.Span, name string, monadic bool) (eval.Shape, eval.Effect, error) {
return ss.LinkField(name, monadic), nil, nil
}
func (ss *StructSymbol) LinkField(name string, monadic bool) Symbol {
if found := ss.FindName(name); found != nil {
return found.Value
} else if monadic {
if found := ss.FindMonadic(); found != nil {
return found.Value
}
}
return EmptySymbol{}
}
func (ss *StructSymbol) Select(span *model.Span, path model.Path) (_ eval.Shape, _ eval.Effect, err error) {
if len(path) == 0 {
return ss, nil, nil
} else {
return ss.Walk(path[0]).Select(span, path[1:])
}
}
func (ss *StructSymbol) Walk(step string) Symbol {
if found := ss.FindName(step); found != nil {
return found.Value
} else {
return EmptySymbol{}
}
}