go-rfc8259/boolean/parsefalse.go

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package rfc8259boolean
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import (
"io"
"sourcecode.social/reiver/go-erorr"
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"sourcecode.social/reiver/go-rfc8259/errors"
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)
func errProblemParsingBooleanFalse(expected rune, actual rune) error {
return erorr.Errorf("rfc8259: problem when trying to parse JSON boolean literal 'false' — expected a %q (%U) but actually got a %q (%U)", expected, expected, actual, actual)
}
// ParseFalse tries to parse the JSON boolean literal 'false'.
// If it succeeds, then it return nil.
// If it failed, it returns an error.
//
// Example usage:
//
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// var runescanner io.RuneScanner
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//
// // ...
//
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// err := rfc8259.ParseFalse(runescanner)
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//
// if nil != err {
// fmt.Printf("We did NOT have a 'false', but instead got the error: %s\n", err)
// } else {
// fmt.Print("We had a 'false'\n")
// }
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func parseFalse(runescanner io.RuneScanner) error {
if nil == runescanner {
return rfc8259errors.ErrNilRuneScanner
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}
{
const expected rune = 'f'
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r, _, err := runescanner.ReadRune()
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if nil != err {
if io.EOF == err {
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return rfc8259errors.ErrUnexpectedEndOfFile
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}
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return rfc8259errors.ErrProblemReadingRune(err)
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}
if expected != r {
return errProblemParsingBooleanFalse(expected, r)
}
}
{
const expected rune = 'a'
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r, _, err := runescanner.ReadRune()
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if nil != err {
if io.EOF == err {
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return rfc8259errors.ErrUnexpectedEndOfFile
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}
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return rfc8259errors.ErrProblemReadingRune(err)
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}
if expected != r {
return errProblemParsingBooleanFalse(expected, r)
}
}
{
const expected rune = 'l'
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r, _, err := runescanner.ReadRune()
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if nil != err {
if io.EOF == err {
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return rfc8259errors.ErrUnexpectedEndOfFile
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}
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return rfc8259errors.ErrProblemReadingRune(err)
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}
if expected != r {
return errProblemParsingBooleanFalse(expected, r)
}
}
{
const expected rune = 's'
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r, _, err := runescanner.ReadRune()
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if nil != err {
if io.EOF == err {
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return rfc8259errors.ErrUnexpectedEndOfFile
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}
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return rfc8259errors.ErrProblemReadingRune(err)
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}
if expected != r {
return errProblemParsingBooleanFalse(expected, r)
}
}
{
const expected rune = 'e'
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r, _, err := runescanner.ReadRune()
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if nil != err {
if io.EOF == err {
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return rfc8259errors.ErrUnexpectedEndOfFile
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}
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return rfc8259errors.ErrProblemReadingRune(err)
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}
if expected != r {
return errProblemParsingBooleanFalse(expected, r)
}
}
return nil
}