forked from jshiffer/matterbridge
120 lines
2.8 KiB
Go
120 lines
2.8 KiB
Go
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
|
|
}
|