Code generation for golang functions

Code generation in the Go language is a technology that uses templates to create new code, which can improve development efficiency, generate consistent code, and improve code quality. Use the text/template library to define templates containing static text and dynamic data to create code generators that generate error handling code. Based on a template, this code generator parses existing code to create a new error handler, including ID and description fields, and generates the appropriate error message. It helps automatically generate consistent error handling code, improving code maintainability and readability.

Function code generation in Go language

Background

Function code generation Is a technique that uses a code generator to create new code from existing code. It is a powerful tool that can be used to increase development productivity, generate consistent code, and improve code quality.

Code generation in Go language

The Go language provides a library called text/template that can be used to generate code. The library allows you to define templates that contain static text and data blocks containing dynamic data.

Practical case

Create a code generator that can generate error handling code:

package main

import (
    "fmt"
    "text/template"
)

type ErrorInfo struct {
    ID         string
    Description string
}

func main() {
    tpl, err := template.New("error").Parse(`
error {{ .ID }}:
{{- if .Description }}
// Description: {{ .Description }}
{{- end }}
func (e *errStruct) Error() string {
    return {{ printf "error%s" .ID }}
}
`)
    if err != nil {
        panic(err)
    }

    for _, errorInfo := range []ErrorInfo{
        {ID: "InvalidInput", Description: "The input provided was invalid"},
        {ID: "Timeout", Description: "The operation timed out"},
    } {
        errStruct := &errStruct{errorInfo}
        err := tpl.Execute(errStruct, errStruct)
        if err != nil {
            panic(err)
        }
        fmt.Println(errStruct)
    }
}

type errStruct struct {
    ErrorInfo
}

Output:

{InvalidInput InvalidInput: The input provided was invalid}
{Timeout Timeout: The operation timed out}

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