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// Copyright 2021 CUE Authors
//
// 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 pbinternal
import (
"strconv"
"cuelang.org/go/cue"
"cuelang.org/go/cue/ast"
"cuelang.org/go/cue/token"
)
// MatchBySymbol finds an integer value for a given symbol name, representing
// an enum value, and sets it in x.
func MatchBySymbol(v cue.Value, name string, x *ast.BasicLit) bool {
if op, a := v.Expr(); op == cue.AndOp {
for _, v := range a {
if MatchBySymbol(v, name, x) {
return true
}
}
}
return matchBySymbol(cue.Dereference(v), name, x)
}
func matchBySymbol(v cue.Value, name string, x *ast.BasicLit) bool {
switch op, a := v.Expr(); op {
case cue.OrOp, cue.AndOp:
for _, v := range a {
if matchBySymbol(v, name, x) {
return true
}
}
default:
_, path := v.ReferencePath()
a := path.Selectors()
if len(a) == 0 {
break
}
if s := a[len(a)-1]; !s.IsDefinition() || s.String()[1:] != name {
break
}
if i, err := v.Int64(); err == nil {
x.Kind = token.INT
x.Value = strconv.Itoa(int(i))
return true
}
}
return false
}
// MatchByInt finds a symbol for a given enum value and sets it in x.
func MatchByInt(v cue.Value, val int64) string {
if op, a := v.Expr(); op == cue.AndOp {
for _, v := range a {
if s := MatchByInt(v, val); s != "" {
return s
}
}
}
v = cue.Dereference(v)
return matchByInt(v, val)
}
func matchByInt(v cue.Value, val int64) string {
switch op, a := v.Expr(); op {
case cue.OrOp, cue.AndOp:
for _, v := range a {
if s := matchByInt(v, val); s != "" {
return s
}
}
default:
if i, err := v.Int64(); err != nil || i != val {
break
}
_, path := v.ReferencePath()
a := path.Selectors()
if len(a) == 0 {
break
}
sel := a[len(a)-1]
if !sel.IsDefinition() {
break
}
return sel.String()[1:]
}
return ""
}
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