Go 常用数值比较判断

参考文章：Go 常用数值比较判断

使用 go 开发时，遇到对某个数据依据某个标准规则进行对比，得出结论
如：无法判断、正常、低于正常值、高于正常值。
以下及实现过程，通过正则匹配对应的判断规则，从而对提供的数值进行判断

compare.go

package mainimport ("fmt""regexp""strconv""strings"
)const (// 结论#0%无法判断|1%正常|2%低于正常值|3%高于正常值ResultUnknown = iotaResultNormalResultSubnormalResultAboveNormal
)var substrArr = map[string]struct {// 正则表达式Pattern string// 比较形式#1%等于|2%小于|3%大于|4%小于等于|5%大于等于|6%范围Compare   int8Separator stringExample   string
}{"=": {Pattern:   `^=[+-]?\d+(\.\d*)?$`,Compare:   1,Separator: "=",Example:   "=10%a|8|10|12",},"<": {Pattern:   `^<[+-]?\d+(\.\d*)?$`,Compare:   2,Separator: "<",Example:   "<10%a|8|10|12",},">": {Pattern:   `^>[+-]?\d+(\.\d*)?$`,Compare:   3,Separator: ">",Example:   ">10%a|8|10|12",},"≤": {Pattern:   `^≤[+-]?\d+(\.\d*)?$`,Compare:   4,Separator: "=<",Example:   "≤10%a|8|10|12",},"≥": {Pattern:   `^≥[+-]?\d+(\.\d*)?$`,Compare:   5,Separator: ">=",Example:   "≥10%a|8|10|12",},"-": {Pattern:   `^[+-]?\d+(\.\d*)?-[+-]?\d+(\.\d*)?$`,Compare:   6,Separator: "-",Example:   "18.5-24%a|16|18.5|20|24|26",},"~": {Pattern:   `^[+-]?\d+(\.\d*)?~[+-]?\d+(\.\d*)?$`,Compare:   6,Separator: "~",Example:   "18.5~24%a|16|18.5|20|24|26",},
}func CompareResult(resultStr, referralStr string) int8 {var (separator stringcompare   int8)resultStr = strings.Trim(resultStr, " ")referralStr = strings.Trim(referralStr, " ")floatRes, errRes := strconv.ParseFloat(resultStr, 64)if errRes != nil {fmt.Println("result: 无法判断")fmt.Println("floatRes1 error", errRes)return ResultUnknown}for key, val := range substrArr {matched, err := regexp.MatchString(val.Pattern, referralStr)if err != nil || !matched {continue}compare = substrArr[key].Compareseparator = key}index := strings.Index(referralStr, separator)min := referralStr[:index]max := referralStr[index+len(separator):]floatMin, errMin := strconv.ParseFloat(min, 64)floatMax, errMax := strconv.ParseFloat(max, 64)//fmt.Printf("referralStr:%s, resultStr:%s, separator: %s \n", referralStr, resultStr, separator)//fmt.Printf("compare: %d, index: %d, min: %s, max: %s \n", compare, index, min, max)//fmt.Printf("floatRes: %f, floatMin: %f, floatMax: %f \n", floatRes, floatMin, floatMax)// "="if compare == 1 {//fmt.Println("compare:1 =")if errMax != nil {fmt.Println("result: 无法判断")fmt.Println("floatMax2 error", errMax)return ResultUnknown}if floatRes == floatMax {return ResultNormal} else if floatRes < floatMax {return ResultSubnormal} else if floatRes > floatMax {return ResultAboveNormal}}// "<"if compare == 2 {//fmt.Println("compare:2 <")if errMax != nil {fmt.Println("result: 无法判断")fmt.Println("floatMax2 error", errMax)return ResultUnknown}if floatRes < floatMax {return ResultNormal} else {return ResultAboveNormal}}// ">"if compare == 3 {//fmt.Println("compare:3 >")if errMax != nil {fmt.Println("result: 无法判断")fmt.Println("floatMax2 error", errMax)return ResultUnknown}if floatRes > floatMax {return ResultNormal} else {return ResultSubnormal}}// "=<"if compare == 4 {//fmt.Println("compare:4 =<")if errMax != nil {fmt.Println("result: 无法判断")fmt.Println("floatMax2 error", errMax)return ResultUnknown}if floatRes <= floatMax {return ResultNormal} else {return ResultAboveNormal}}// ">="if compare == 5 {//fmt.Println("compare:5 >=")if errMax != nil {fmt.Println("result: 无法判断")fmt.Println("floatMax2 error", errMax)return ResultUnknown}if floatRes >= floatMax {return ResultNormal} else {return ResultSubnormal}}// - ~if compare == 6 {//fmt.Println("compare:6 -|~")if errMin != nil || errMax != nil {fmt.Println("result: 无法判断")fmt.Println("floatMax2 error", errMax, errMin)return ResultUnknown}if floatRes < floatMin {return ResultSubnormal} else if floatRes > floatMax {return ResultAboveNormal} else {return ResultNormal}}return ResultUnknown
}

compare_test.go

package mainimport "testing"func TestCompareResult(t *testing.T) {strRes := " 10 "str := " 10 "// 无法判断if result := CompareResult(strRes, str); result != ResultUnknown {t.Errorf("CompareResult failure. result: %d", result)}strRes1 := " a "str1 := " =10 "// 无法判断if result := CompareResult(strRes1, str1); result != ResultUnknown {t.Errorf("CompareResult failure. result: %d", result)}strRes1 = " 10 "str1 = " =10 "if result := CompareResult(strRes1, str1); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes1 = " 8 "str1 = " =10 "if result := CompareResult(strRes1, str1); result != ResultSubnormal {t.Errorf("CompareResult failure. result: %d", result)}strRes1 = " 12 "str1 = " =10 "if result := CompareResult(strRes1, str1); result != ResultAboveNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes2 := " a "str2 := " <10 "if result := CompareResult(strRes2, str2); result != ResultUnknown {t.Errorf("CompareResult failure. result: %d", result)}strRes2 = " 8 "str2 = " <10 "if result := CompareResult(strRes2, str2); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes2 = " 10 "str2 = " <10 "if result := CompareResult(strRes2, str2); result != ResultAboveNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes2 = " 12 "str2 = " <10 "if result := CompareResult(strRes2, str2); result != ResultAboveNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes3 := " a "str3 := " >10 "if result := CompareResult(strRes3, str3); result != ResultUnknown {t.Errorf("CompareResult failure. result: %d", result)}strRes3 = " 12 "str3 = " >10 "if result := CompareResult(strRes3, str3); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes3 = " 10 "str3 = " >10 "if result := CompareResult(strRes3, str3); result != ResultSubnormal {t.Errorf("CompareResult failure. result: %d", result)}strRes3 = " 8 "str3 = " >10 "if result := CompareResult(strRes3, str3); result != ResultSubnormal {t.Errorf("CompareResult failure. result: %d", result)}strRes4 := " a "str4 := " ≤10 "if result := CompareResult(strRes4, str4); result != ResultUnknown {t.Errorf("CompareResult failure. result: %d", result)}strRes4 = " 8 "str4 = " ≤10 "if result := CompareResult(strRes4, str4); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes4 = " 10 "str4 = " ≤10 "if result := CompareResult(strRes4, str4); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes4 = " 12 "str4 = " ≤10 "if result := CompareResult(strRes4, str4); result != ResultAboveNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes5 := " a "str5 := " ≥10 "if result := CompareResult(strRes5, str5); result != ResultUnknown {t.Errorf("CompareResult failure. result: %d", result)}strRes5 = " 10 "str5 = " ≥10 "if result := CompareResult(strRes5, str5); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes5 = " 12 "str5 = " ≥10 "if result := CompareResult(strRes5, str5); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes5 = " 8 "str5 = " ≥10 "if result := CompareResult(strRes5, str5); result != ResultSubnormal {t.Errorf("CompareResult failure. result: %d", result)}strRes6 := " a "str6 := " 18.5~24 "if result := CompareResult(strRes6, str6); result != ResultUnknown {t.Errorf("CompareResult failure. result: %d", result)}strRes6 = " 18.5 "str6 = " 18.5~24 "if result := CompareResult(strRes6, str6); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes6 = " 20 "str6 = " 18.5~24 "if result := CompareResult(strRes6, str6); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes6 = " 24 "str6 = " 18.5~24 "if result := CompareResult(strRes6, str6); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes6 = " 16 "str6 = " 18.5~24 "if result := CompareResult(strRes6, str6); result != ResultSubnormal {t.Errorf("CompareResult failure. result: %d", result)}strRes6 = " 26 "str6 = " 18.5~24 "if result := CompareResult(strRes6, str6); result != ResultAboveNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes7 := " a "str7 := " 18.5-24 "if result := CompareResult(strRes7, str7); result != ResultUnknown {t.Errorf("CompareResult failure. result: %d", result)}strRes7 = " 18.5 "str7 = " 18.5-24 "if result := CompareResult(strRes7, str7); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes7 = " 20 "str7 = " 18.5-24 "if result := CompareResult(strRes7, str7); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes7 = " 24 "str7 = " 18.5-24 "if result := CompareResult(strRes7, str7); result != ResultNormal {t.Errorf("CompareResult failure. result: %d", result)}strRes7 = " 16 "str7 = " 18.5-24 "if result := CompareResult(strRes7, str7); result != ResultSubnormal {t.Errorf("CompareResult failure. result: %d", result)}strRes7 = " 26 "str7 = " 18.5-24 "if result := CompareResult(strRes7, str7); result != ResultAboveNormal {t.Errorf("CompareResult failure. result: %d", result)}
}

测试结果

=== RUN   TestCompareResult
result: 无法判断
floatRes1 error strconv.ParseFloat: parsing "a": invalid syntax
result: 无法判断
floatRes1 error strconv.ParseFloat: parsing "a": invalid syntax
result: 无法判断
floatRes1 error strconv.ParseFloat: parsing "a": invalid syntax
result: 无法判断
floatRes1 error strconv.ParseFloat: parsing "a": invalid syntax
result: 无法判断
floatRes1 error strconv.ParseFloat: parsing "a": invalid syntax
result: 无法判断
floatRes1 error strconv.ParseFloat: parsing "a": invalid syntax
result: 无法判断
floatRes1 error strconv.ParseFloat: parsing "a": invalid syntax
--- PASS: TestCompareResult (0.00s)
PASSProcess finished with exit code 0

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