expression EL表达式

项目地址：go-expression

目前发布初始版本，欢迎体验。有帮助的恳请点一个star。

Install

go get github.com/heartlhj/go-expression

功能

字符串的提取和比较

context := spel.StandardEvaluationContext{ }

m := make(map[string]interface{ })
m["name"] = "lisi"
m["age"] = 18
context.SetVariables(m)
parser := SpelExpressionParser{ }
expressionString := "#name=='lisi'"
//expressionString := "#name" //返回lisi
valueContext := parser.ParseExpression(expressionString).GetValueContext(&context)

数字比较，支持int和 float64

context := spel.StandardEvaluationContext{ }

m := make(map[string]interface{ })
m["name"] = "lisi"
m["age"] = 18
context.SetVariables(m)
parser := SpelExpressionParser{ }
expressionString := "#age>=10"
valueContext := parser.ParseExpression(expressionString).GetValueContext(&context)

float64比较

context := spel.StandardEvaluationContext{ }
    m := make(map[string]interface{ })
    var ageFloat float64
    ageFloat = 10
    m["num"] = ageFloat
    context.SetVariables(m)
    parser := SpelExpressionParser{ }
    expressionString := "#num>=9f"
    valueContext := parser.ParseExpression(expressionString).GetValueContext(&context)

与（&&）或（||）操作

context := spel.StandardEvaluationContext{ }

m := make(map[string]interface{ })
m["name"] = "lisi"
m["age"] = 18
context.SetVariables(m)
parser := SpelExpressionParser{ }
expressionString := "#name=='lisi' && #age>=3"
valueContext := parser.ParseExpression(expressionString).GetValueContext(&context)

复合结构，迭代提取

context := spel.StandardEvaluationContext{ }

context.AddPropertyAccessor(spel.MapAccessor{ })
m := make(map[string]interface{ })
m["name"] = "lisi"
m["age"] = 18
m1 := make(map[string]interface{ })
m2 := make(map[string]interface{ })
m2["num"] = 12
m1["code"] = m2
m["order"] = m1
context.SetVariables(m)
parser := SpelExpressionParser{ }
expressionString := "#order.code.num==12"
valueContext := parser.ParseExpression(expressionString).GetValueContext(&context)

数组和切片提取

context := spel.StandardEvaluationContext{ }

context.AddPropertyAccessor(spel.MapAccessor{ })
m := make(map[string]interface{ })
m["name"] = "lisi"
m["age"] = 18
m1 := make(map[string]interface{ })
//切片
//orders := make([]Order, 2)
//数组
orders := [2]Order{ }
orders[0] = Order{ name: "lisi", age: 12}
orders[1] = Order{ name: "wang", age: 24}
m1["code"] = orders
m["order"] = m1
context.SetVariables(m)
parser := SpelExpressionParser{ }
expressionString := "#order.code[0].name=='lisi'"
valueContext := parser.ParseExpression(expressionString).GetValueContext(&context)

字符串下标判断提取

context := spel.StandardEvaluationContext{ }

context.AddPropertyAccessor(spel.MapAccessor{ })
m := make(map[string]interface{ })
m["name"] = "lisi"
m["age"] = 18
context.SetVariables(m)
parser := SpelExpressionParser{ }
expressionString := "#name[2]=='s'"
valueContext := parser.ParseExpression(expressionString).GetValueContext(&context)