github.com/solo-io/cue@v0.4.7/internal/core/export/label.go (about)

     1  // Copyright 2020 CUE Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package export
    16  
    17  import (
    18  	"strconv"
    19  	"strings"
    20  
    21  	"github.com/solo-io/cue/cue/ast"
    22  	"github.com/solo-io/cue/cue/literal"
    23  	"github.com/solo-io/cue/cue/token"
    24  	"github.com/solo-io/cue/internal/core/adt"
    25  )
    26  
    27  func (e *exporter) stringLabel(f adt.Feature) ast.Label {
    28  	x := f.Index()
    29  	switch f.Typ() {
    30  	case adt.IntLabel:
    31  		return ast.NewLit(token.INT, strconv.Itoa(int(x)))
    32  
    33  	case adt.DefinitionLabel, adt.HiddenLabel, adt.HiddenDefinitionLabel:
    34  		s := f.IdentString(e.ctx)
    35  		return ast.NewIdent(s)
    36  
    37  	case adt.StringLabel:
    38  		s := e.ctx.IndexToString(int64(x))
    39  		if f == 0 || !ast.IsValidIdent(s) ||
    40  			strings.HasPrefix(s, "#") || strings.HasPrefix(s, "_") {
    41  			return ast.NewLit(token.STRING, literal.Label.Quote(s))
    42  		}
    43  		fallthrough
    44  
    45  	default:
    46  		return ast.NewIdent(e.ctx.IndexToString(int64(x)))
    47  	}
    48  }