70 lines
1.3 KiB
Go
70 lines
1.3 KiB
Go
package rfc8259
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import (
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"io"
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"sourcecode.social/reiver/go-erorr"
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)
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// ParseBoolean tries to parse a JSON boolean literal — i.e., either 'false' or 'true'.
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// If it succeeds, then it return nil, and sets ‘dst’ to the parsed value.
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// If it failed, it returns an error.
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//
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// Example usage:
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//
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// var rs io.RuneScaner
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//
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// // ...
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//
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// var value bool
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// err := rfc8259.ParseTrue(rs, &value)
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//
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// if nil != err {
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// return err
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// }
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//
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// fmt.Printf("value = %t\n", value)
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func ParseBoolean(runescanner io.RuneScanner, dst *bool) error {
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if nil == runescanner {
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return errNilRuneScanner
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}
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if nil == dst {
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return errNilDestination
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}
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var r rune
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{
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var err error
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r, _, err = runescanner.ReadRune()
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if nil != err {
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if io.EOF == err {
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return errUnexpectedEndOfFile
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}
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return errProblemReadingRune(err)
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}
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if err := runescanner.UnreadRune(); nil != err {
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return errProblemUnreadingRune(err, r)
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}
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}
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switch r {
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case 'f':
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if err := ParseFalse(runescanner); nil != err {
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return err
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}
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*dst = false
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return nil
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case 't':
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if err := ParseTrue(runescanner); nil != err {
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return err
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}
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*dst = true
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return nil
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default:
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return erorr.Errorf("rfc8259: problem when trying to parse JSON boolean literal — expected either 'false' or 'true' but first character was %q (%U)", r, r)
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}
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}
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