105 lines
1.8 KiB
Go
105 lines
1.8 KiB
Go
package rfc8259
|
|
|
|
import (
|
|
"io"
|
|
|
|
"sourcecode.social/reiver/go-erorr"
|
|
)
|
|
|
|
func errProblemParsingBooleanTrue(expected rune, actual rune) error {
|
|
return erorr.Errorf("rfc8259: problem when trying to parse JSON boolean literal 'true' — expected a %q (%U) but actually got a %q (%U)", expected, expected, actual, actual)
|
|
}
|
|
|
|
// ParseTrue tries to parse the JSON boolean literal 'true'.
|
|
// If it succeeds, then it return nil.
|
|
// If it failed, it returns an error.
|
|
//
|
|
// Example usage:
|
|
//
|
|
// var rr io.RuneReader
|
|
//
|
|
// // ...
|
|
//
|
|
// err := rfc8259.ParseTrue(rr)
|
|
//
|
|
// if nil != err {
|
|
// fmt.Printf("We did NOT have a 'true', but instead got the error: %s\n", err)
|
|
// } else {
|
|
// fmt.Print("We had a 'true'\n")
|
|
// }
|
|
func ParseTrue(rr io.RuneReader) error {
|
|
if nil == rr {
|
|
return errNilRuneReader
|
|
}
|
|
|
|
{
|
|
const expected rune = 't'
|
|
|
|
r, _, err := rr.ReadRune()
|
|
if nil != err {
|
|
if io.EOF == err {
|
|
return errUnexpectedEndOfFile
|
|
}
|
|
|
|
return errProblemReadingRune(err)
|
|
}
|
|
|
|
if expected != r {
|
|
return errProblemParsingBooleanTrue(expected, r)
|
|
}
|
|
}
|
|
|
|
{
|
|
const expected rune = 'r'
|
|
|
|
r, _, err := rr.ReadRune()
|
|
if nil != err {
|
|
if io.EOF == err {
|
|
return errUnexpectedEndOfFile
|
|
}
|
|
|
|
return errProblemReadingRune(err)
|
|
}
|
|
|
|
if expected != r {
|
|
return errProblemParsingBooleanTrue(expected, r)
|
|
}
|
|
}
|
|
|
|
{
|
|
const expected rune = 'u'
|
|
|
|
r, _, err := rr.ReadRune()
|
|
if nil != err {
|
|
if io.EOF == err {
|
|
return errUnexpectedEndOfFile
|
|
}
|
|
|
|
return errProblemReadingRune(err)
|
|
}
|
|
|
|
if expected != r {
|
|
return errProblemParsingBooleanTrue(expected, r)
|
|
}
|
|
}
|
|
|
|
{
|
|
const expected rune = 'e'
|
|
|
|
r, _, err := rr.ReadRune()
|
|
if nil != err {
|
|
if io.EOF == err {
|
|
return errUnexpectedEndOfFile
|
|
}
|
|
|
|
return errProblemReadingRune(err)
|
|
}
|
|
|
|
if expected != r {
|
|
return errProblemParsingBooleanTrue(expected, r)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|