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)