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encoding/json: can add UnmarshalWithUseNumber function #7067

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gopherbot opened this issue Jan 6, 2014 · 5 comments
Closed

encoding/json: can add UnmarshalWithUseNumber function #7067

gopherbot opened this issue Jan 6, 2014 · 5 comments
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@gopherbot
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by runner.mei:

func UnmarshalWithUseNumber(data []byte, v interface{}) error {
            // Check for well-formedness.
            // Avoids filling out half a data structure
            // before discovering a JSON syntax error.
            var d decodeState
========================= add next line ===============
                d.useNumber = true
            err := checkValid(data, &d.scan)
            if err != nil {
                return err
            }
        
            d.init(data)
            return d.unmarshal(v)
        }
@bradfitz
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bradfitz commented Jan 6, 2014

Comment 1:

Rather than provide a patch, please describe (or given a link to a play.golang.org
program) that is broken.

@gopherbot
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Comment 2 by runner.mei:

can add UnmarshalWithUseNumber function, like this:
http://play.golang.org/p/GvJ71Ybgwv

@bradfitz
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bradfitz commented Jan 7, 2014

Comment 3:

We can't provide a function for every combination of options.  I think using Decoder
here is fine.

Status changed to WorkingAsIntended.

@gopherbot
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Comment 4 by runner.mei:

If you use the decoder, then data will be copied to Decoder.buf field, will increase an
unnecessary copy.
  dec := json.NewDecoder(strings.NewReader(data))
  dec.UseNumber()
  dec.Decode(&m) // data will copy to dec.buf, it is unnecessary.
 
data length is 2m in my program.

@gopherbot
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Comment 5 by runner.mei:

also add json.NewDecoderWithBytes function.
  data, _ := ioutil.ReadAll(reader)
  dec := json.NewDecoderWithBytes(data)
  dec.UseNumber()
  dec.Decode(&m)

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@bradfitz @gopherbot