util.go

Documentation: cuelang.org/go/encoding/protobuf

     1  // Copyright 2019 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 protobuf
    16  
    17  import (
    18  	"fmt"
    19  	"strings"
    20  	"text/scanner"
    21  
    22  	"github.com/emicklei/proto"
    23  
    24  	"cuelang.org/go/cue/ast"
    25  	"cuelang.org/go/cue/token"
    26  )
    27  
    28  // failf panics with a marked error that can be intercepted upon returning
    29  // from parsing.
    30  func failf(pos scanner.Position, format string, args ...interface{}) {
    31  	panic(protoError{pos, fmt.Errorf(format, args...)})
    32  }
    33  
    34  func fail(pos scanner.Position, err error) {
    35  	panic(protoError{pos, err})
    36  }
    37  
    38  type protoError struct {
    39  	pos scanner.Position
    40  	error
    41  }
    42  
    43  var (
    44  	newSection = token.NewSection.Pos()
    45  )
    46  
    47  func addComments(f ast.Node, i int, doc, inline *proto.Comment) bool {
    48  	cg := comment(doc, true)
    49  	if cg != nil && len(cg.List) > 0 && i > 0 {
    50  		cg.List[0].Slash = newSection
    51  	}
    52  	f.AddComment(cg)
    53  	f.AddComment(comment(inline, false))
    54  	return doc != nil
    55  }
    56  
    57  func comment(c *proto.Comment, doc bool) *ast.CommentGroup {
    58  	if c == nil || len(c.Lines) == 0 {
    59  		return nil
    60  	}
    61  	cg := &ast.CommentGroup{}
    62  	if doc {
    63  		cg.Doc = true
    64  	} else {
    65  		cg.Line = true
    66  		cg.Position = 10
    67  	}
    68  	for _, s := range c.Lines {
    69  		s = strings.TrimRight(s, " ")
    70  		cg.List = append(cg.List, &ast.Comment{Text: "//" + s})
    71  	}
    72  	return cg
    73  }
    74  
    75  func labelName(s string) string {
    76  	split := strings.Split(s, "_")
    77  	for i := 1; i < len(split); i++ {
    78  		split[i] = strings.Title(split[i])
    79  	}
    80  	return strings.Join(split, "")
    81  }
    82
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