cuelang.org/go@v0.10.1/internal/cli/cli.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 cli
    16  
    17  import (
    18  	"strings"
    19  
    20  	"cuelang.org/go/cue"
    21  	"cuelang.org/go/cue/ast"
    22  	"cuelang.org/go/cue/errors"
    23  	"cuelang.org/go/cue/parser"
    24  	"cuelang.org/go/cue/token"
    25  )
    26  
    27  func ParseValue(pos token.Pos, name, str string, k cue.Kind) (x ast.Expr, errs errors.Error) {
    28  	var expr ast.Expr
    29  
    30  	if k&cue.NumberKind != 0 {
    31  		var err error
    32  		expr, err = parser.ParseExpr(name, str)
    33  		if err != nil {
    34  			errs = errors.Wrapf(err, pos,
    35  				"invalid number for injection tag %q", name)
    36  		}
    37  	}
    38  
    39  	if k&cue.BoolKind != 0 {
    40  		str = strings.TrimSpace(str)
    41  		b, ok := boolValues[str]
    42  		if !ok {
    43  			errs = errors.Append(errs, errors.Newf(pos,
    44  				"invalid boolean value %q for injection tag %q", str, name))
    45  		} else if expr != nil || k&cue.StringKind != 0 {
    46  			// Convert into an expression
    47  			bl := ast.NewBool(b)
    48  			if expr != nil {
    49  				expr = &ast.BinaryExpr{Op: token.OR, X: expr, Y: bl}
    50  			} else {
    51  				expr = bl
    52  			}
    53  		} else {
    54  			x = ast.NewBool(b)
    55  		}
    56  	}
    57  
    58  	if k&cue.StringKind != 0 {
    59  		if expr != nil {
    60  			expr = &ast.BinaryExpr{Op: token.OR, X: expr, Y: ast.NewString(str)}
    61  		} else {
    62  			x = ast.NewString(str)
    63  		}
    64  	}
    65  
    66  	switch {
    67  	case expr != nil:
    68  		return expr, nil
    69  	case x != nil:
    70  		return x, nil
    71  	case errs == nil:
    72  		return nil, errors.Newf(pos,
    73  			"invalid type for injection tag %q", name)
    74  	}
    75  	return nil, errs
    76  }
    77  
    78  var boolValues = map[string]bool{
    79  	"1":     true,
    80  	"0":     false,
    81  	"t":     true,
    82  	"f":     false,
    83  	"T":     true,
    84  	"F":     false,
    85  	"true":  true,
    86  	"false": false,
    87  	"TRUE":  true,
    88  	"FALSE": false,
    89  	"True":  true,
    90  	"False": false,
    91  }