README
¶
formula
支持对数学运算的编译执行，主要支持以下数学公式：
- 支持四则运算
- 支持三角函数
- 支持位运算
- 支持三元操作
- 支持逻辑运算符
- 支持自定义参数
- 支持自定义函数
- 支持公式缓存
支持lua
- 支持lua缓存
内置函数如下表
| 函数名称 | 参数个数 | 调用方式 | 结果 |
|---|---|---|---|
| abs | 1 | abs(-1) | 1 |
| acos | 1 | acos(sqrt(3)/2) | 0.5235987755982991 (π/6) |
| asin | 1 | asin(1/2) | 0.5235987755982991 (π/6) |
| asin | 1 | asin(1) | π/2 |
| atan | 1 | atan(1) | 0.7853981633974483 (π/4) |
| ceil | 1 | ceil(3.4) | 4 |
| concat | n | concat(1,23,hello) | 123hello |
| cos | 1 | cos(π/3) | 0.5000000000000001 |
| / | 2 | 3/4 | 0.75 |
| exp | 1 | exp(3.3) | 27.112638920657883 |
| floor | 1 | floor(2.2) | 2 |
| > | 2 | 3 > 2 | true |
| if | 3 | iif(3 > 2,π,10) | 3.141592653589793 |
| < | 2 | 3 < 2 | false |
| in | n | in(3,3,4,5) | true |
| ln | 1 | ln(2.718281828) | 0.9999999998311266 |
| log2 | 1 | log2(16) | 4 |
| log10 | 1 | log10(100000) | 5 |
| log | 2 | log(100,10) | 2 |
| max | n | max(-1,2,3.1) = 3.1 | 3.1 |
| min | n | min(-1,2,3.1) = -1 | -1 |
| mod | 2 | mod(5,2) | 1 |
| * | 2 | 3*3.4 | 10.2 |
| + | 2 | 5+10 | 15 |
| pow | 2 | pow(10,2) | 100 |
| round | 2 | round(100.11) | 100 |
| sign | 1 | sign(100) | false |
| sin | 1 | sin(π/6) | 0.49999999999999994 |
| - | 2 | 3-6 | -3 |
| tan | 1 | tan(π/4) | 1 |
| truncate | 1 | truncate(12.3) | 12 |
| >> | 2 | 2>>1 | 1 |
| << | 2 | 1<<1 | 2 |
调用方法
- 普通数学公式调用
params := make(map[string]interface{})
r,err:=HandleFormula("1+2",params)
if err!=nil{
//handle err
}
Documentation
¶
Index ¶
- Variables
- func Register(f *opt.Function) error
- type CustomParamsListener
- type Expression
- func (expression *Expression) AddParameter(name string, value interface{}) error
- func (expression *Expression) Evaluate() (*opt.Argument, error)
- func (expression *Expression) GetParameterNames() []string
- func (expression *Expression) GetResult() (*opt.Argument, error)
- func (expression *Expression) OriginalString() string
- func (expression *Expression) Precompile() error
- func (expression *Expression) ResetParameters()
Constants ¶
This section is empty.
Variables ¶
View Source
var LuaFunctionRegexp = `lua[('\s]+function[\w\s]+\(([a-zA-Z0-9,\s]+)\).*?end\'\)`
View Source
var WildcardRegexp = `(@[\w\d\.]+(\.\*)+[\.\w\d\*]*)[,\s)]`
View Source
var WildcardSymbols = []string{"sum(", "count", "avg"}
Functions ¶
Types ¶
type CustomParamsListener ¶
type CustomParamsListener struct {
parser.BaseFormulaListener
// contains filtered or unexported fields
}
func (*CustomParamsListener) ExitId ¶
func (s *CustomParamsListener) ExitId(c *parser.IdContext)
ExitId is called when exiting the id production.
func (*CustomParamsListener) GetParamNames ¶
func (s *CustomParamsListener) GetParamNames() []string
type Expression ¶
type Expression struct {
// contains filtered or unexported fields
}
Expression for build user's input
func NewExpression ¶
func NewExpression(expression string, options ...opt.Option) *Expression
NewExpression create new Expression
func (*Expression) AddParameter ¶
func (expression *Expression) AddParameter(name string, value interface{}) error
AddParameter add user's parameter which is required in the expression
func (*Expression) Evaluate ¶
func (expression *Expression) Evaluate() (*opt.Argument, error)
Evaluate return result of expression
func (*Expression) GetParameterNames ¶
func (expression *Expression) GetParameterNames() []string
func (*Expression) OriginalString ¶
func (expression *Expression) OriginalString() string
OriginalString return user's input text
func (*Expression) Precompile ¶
func (expression *Expression) Precompile() error
func (*Expression) ResetParameters ¶
func (expression *Expression) ResetParameters()
ResetParameters clear all parameter
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