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tooken_compute.go
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/
tooken_compute.go
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package rule
import (
"fmt"
"math"
)
// +
type tokenADD struct {
comparableBase
}
func (t *tokenADD) Symbol() Symbol {
return ADD
}
func (t *tokenADD) LeftCheckFn() ParamCheckFn {
return func(left, right interface{}, param interface{}) error {
_, ok := convertToFloat(left)
if !isString(left) && !ok {
return fmt.Errorf("add left should be a Number or String, but got %T, value=%v", left, left)
}
return nil
}
}
func (t *tokenADD) RightCheckFn() ParamCheckFn {
return func(left, right interface{}, param interface{}) error {
_, ok := convertToFloat(right)
if !isString(right) && !ok {
return fmt.Errorf("add right should be a Number or String, but got %T, value=%v", right, right)
}
return nil
}
}
func (t *tokenADD) SymbolFn() SymbolFn {
return func(left, right interface{}, param interface{}) (interface{}, error) {
if isString(left) || isString(right) {
return fmt.Sprintf("%v%v", left, right), nil
}
return left.(float64) + right.(float64), nil
}
}
// -
type tokenSUB struct {
comparableBase
}
func (t *tokenSUB) Symbol() Symbol {
return SUB
}
func (t *tokenSUB) SymbolFn() SymbolFn {
return func(left, right interface{}, param interface{}) (interface{}, error) {
return left.(float64) - right.(float64), nil
}
}
// *
type tokenMUL struct {
comparableBase
}
func (t *tokenMUL) Symbol() Symbol {
return MUL
}
func (t *tokenMUL) SymbolFn() SymbolFn {
return func(left, right interface{}, param interface{}) (interface{}, error) {
return left.(float64) * right.(float64), nil
}
}
// /
type tokenQUO struct {
comparableBase
}
func (t *tokenQUO) Symbol() Symbol {
return QUO
}
func (t *tokenQUO) SymbolFn() SymbolFn {
return func(left, right interface{}, param interface{}) (interface{}, error) {
return left.(float64) / right.(float64), nil
}
}
// %
type tokenREM struct {
comparableBase
}
func (t *tokenREM) Symbol() Symbol {
return REM
}
func (t *tokenREM) SymbolFn() SymbolFn {
return func(left, right interface{}, param interface{}) (interface{}, error) {
return math.Mod(left.(float64), right.(float64)), nil
}
}