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operands.go
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/
operands.go
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package language
import (
"fmt"
"strconv"
"strings"
)
// http://unicode.org/reports/tr35/tr35-numbers.html#Operands
type operands struct {
N float64 // absolute value of the source number (integer and decimals)
I int64 // integer digits of n
V int // number of visible fraction digits in n, with trailing zeros
W int // number of visible fraction digits in n, without trailing zeros
F int // visible fractional digits in n, with trailing zeros
T int // visible fractional digits in n, without trailing zeros
}
func newOperands(v interface{}) (*operands, error) {
switch v := v.(type) {
case int:
return newOperandsInt64(int64(v)), nil
case int8:
return newOperandsInt64(int64(v)), nil
case int16:
return newOperandsInt64(int64(v)), nil
case int32:
return newOperandsInt64(int64(v)), nil
case int64:
return newOperandsInt64(v), nil
case string:
return newOperandsString(v)
case float32, float64:
return nil, fmt.Errorf("floats should be formatted into a string")
default:
return nil, fmt.Errorf("invalid type %T; expected integer or string", v)
}
}
func newOperandsInt64(i int64) *operands {
if i < 0 {
i = -i
}
return &operands{float64(i), i, 0, 0, 0, 0}
}
func newOperandsString(s string) (*operands, error) {
if s[0] == '-' {
s = s[1:]
}
n, err := strconv.ParseFloat(s, 64)
if err != nil {
return nil, err
}
ops := &operands{N: n}
parts := strings.SplitN(s, ".", 2)
ops.I, err = strconv.ParseInt(parts[0], 10, 64)
if err != nil {
return nil, err
}
if len(parts) == 1 {
return ops, nil
}
fraction := parts[1]
ops.V = len(fraction)
for i := ops.V - 1; i >= 0; i-- {
if fraction[i] != '0' {
ops.W = i + 1
break
}
}
if ops.V > 0 {
f, err := strconv.ParseInt(fraction, 10, 0)
if err != nil {
return nil, err
}
ops.F = int(f)
}
if ops.W > 0 {
t, err := strconv.ParseInt(fraction[:ops.W], 10, 0)
if err != nil {
return nil, err
}
ops.T = int(t)
}
return ops, nil
}