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fq/pkg/interp/preview.go

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package interp
import (
"encoding/hex"
"fmt"
"strconv"
"github.com/wader/fq/internal/num"
"github.com/wader/fq/pkg/bitio"
"github.com/wader/fq/pkg/decode"
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)
func previewValue(v interface{}, df decode.DisplayFormat) string {
switch vv := v.(type) {
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case bool:
if vv {
return "true"
}
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return "false"
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case int64:
// TODO: DisplayFormat is weird
return num.PadFormatInt(vv, decode.DisplayFormatToBase(df), true, 0)
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case uint64:
return num.PadFormatUint(vv, decode.DisplayFormatToBase(df), true, 0)
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case float64:
// TODO: float32? better truncated to significant digits?
return strconv.FormatFloat(vv, 'g', -1, 64)
case string:
if len(vv) > 50 {
return fmt.Sprintf("%q", vv[0:50]) + "..."
}
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return fmt.Sprintf("%q", vv)
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case []byte:
if len(vv) > 16 {
return hex.EncodeToString(vv[0:16]) + "..."
}
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return hex.EncodeToString(vv)
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case *bitio.Buffer:
vvLen := vv.Len()
if vvLen > 16*8 {
bs, _ := vv.BytesRange(0, 16)
return hex.EncodeToString(bs) + "..."
}
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bs, _ := vv.BytesRange(0, int(bitio.BitsByteCount(vvLen)))
return hex.EncodeToString(bs)
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case nil:
return "none"
default:
panic("unreachable")
}
}