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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 int64 // number of visible fraction digits in n, with trailing zeros
W int64 // number of visible fraction digits in n, without trailing zeros
F int64 // visible fractional digits in n, with trailing zeros
T int64 // visible fractional digits in n, without trailing zeros
}
// NmodEqualAny returns true if o represents an integer equal to any of the arguments.
func (o *operands) NequalsAny(any ...int64) bool {
for _, i := range any {
if o.I == i && o.T == 0 {
return true
}
}
return false
}
// NmodEqualAny returns true if o represents an integer equal to any of the arguments modulo mod.
func (o *operands) NmodEqualsAny(mod int64, any ...int64) bool {
modI := o.I % mod
for _, i := range any {
if modI == i && o.T == 0 {
return true
}
}
return false
}
// NmodInRange returns true if o represents an integer in the closed interval [from, to].
func (o *operands) NinRange(from, to int64) bool {
return o.T == 0 && from <= o.I && o.I <= to
}
// NmodInRange returns true if o represents an integer in the closed interval [from, to] modulo mod.
func (o *operands) NmodInRange(mod, from, to int64) bool {
modI := o.I % mod
return o.T == 0 && from <= modI && modI <= to
}
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 = int64(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 = f
}
if ops.W > 0 {
t, err := strconv.ParseInt(fraction[:ops.W], 10, 0)
if err != nil {
return nil, err
}
ops.T = t
}
return ops, nil
}
|
