72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
package rfc8259boolean
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import (
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"io"
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"sourcecode.social/reiver/go-erorr"
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"sourcecode.social/reiver/go-rfc8259/errors"
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)
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// Parse 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 rfc8259boolean.Boolean
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// err := rfc8259.Parse(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 = %#v\n", value)
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func Parse(runescanner io.RuneScanner, dst *Boolean) error {
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if nil == runescanner {
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return rfc8259errors.ErrNilRuneScanner
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}
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if nil == dst {
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return rfc8259errors.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 rfc8259errors.ErrUnexpectedEndOfFile
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}
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return rfc8259errors.ErrProblemReadingRune(err)
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}
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if err := runescanner.UnreadRune(); nil != err {
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return rfc8259errors.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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