forked from v2pro/plz.codegen
/
func_define.go
155 lines (142 loc) · 4.61 KB
/
func_define.go
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package generic
import (
"fmt"
"reflect"
"runtime"
"github.com/v2pro/plz/countlog"
)
type FuncTemplateBuilder struct {
funcTemplate *FuncTemplate
}
func DefineFunc(signature string) *FuncTemplateBuilder {
importedFuncTemplates := map[string]*FuncTemplate{}
importedStructTemplates := map[string]*StructTemplate{}
parsedSignature, err := parseSignature(signature)
if err != nil {
panic(err.Error())
}
_, definedInFile, _, _ := runtime.Caller(1)
return &FuncTemplateBuilder{funcTemplate: &FuncTemplate{
funcSignature: parsedSignature,
definedInFile: definedInFile,
templateParams: map[string]TemplateParam{},
importedFuncTemplates: importedFuncTemplates,
importedStructTemplates: importedStructTemplates,
importedPackages: map[string]bool{},
declarations: map[string]bool{},
generators: map[string]interface{}{
"name": genName,
"key": genKey,
"elem": genElem,
"expand": func(depName string, templateArgs ...interface{}) (string, error) {
depFunc := importedFuncTemplates[depName]
if depFunc != nil {
expandedFuncName, err := depFunc.expand(templateArgs)
if err != nil {
countlog.Error("event!expand func failed",
"depName", depName,
"err", err,
"templateArgs", templateArgs)
return "", err
}
return expandedFuncName, nil
}
depStruct := importedStructTemplates[depName]
if depStruct != nil {
expandedStructName, err := depStruct.expand(templateArgs)
if err != nil {
countlog.Error("event!expand struct failed",
"depName", depName,
"err", err,
"templateArgs", templateArgs)
return "", err
}
return expandedStructName, nil
}
countlog.Error("event!missing dependency", "depName", depName)
return "", fmt.Errorf(
"referenced generic function %s should be imported by ImportFunc",
depName)
},
},
}}
}
func (builder *FuncTemplateBuilder) Param(paramName string, paramDescription string, defaultValues ...interface{}) *FuncTemplateBuilder {
param := TemplateParam{
Name: paramName,
Description: paramDescription,
}
switch len(defaultValues) {
case 1:
defaultValueProvider, isProvider := defaultValues[0].(func(ArgMap) interface{})
if isProvider {
param.DefaultValueProvider = defaultValueProvider
} else {
if reflect.TypeOf(defaultValues[0]).Kind() == reflect.Func {
panic("default value provider should be func(map[string]interface{})interface{}")
}
param.DefaultValueProvider = func(argMap ArgMap) interface{} {
return defaultValues[0]
}
}
case 0:
// ignore
default:
panic("only one default value should be provided")
}
builder.funcTemplate.templateParams[paramName] = param
return builder
}
func (builder *FuncTemplateBuilder) Generators(kv ...interface{}) *FuncTemplateBuilder {
for i := 0; i < len(kv); i += 2 {
k := kv[i].(string)
v := kv[i+1]
builder.funcTemplate.generators[k] = v
}
return builder
}
func (builder *FuncTemplateBuilder) ImportFunc(funcTemplates ...*FuncTemplate) *FuncTemplateBuilder {
for _, funcTemplate := range funcTemplates {
builder.funcTemplate.importedFuncTemplates[funcTemplate.funcName] = funcTemplate
}
return builder
}
func (builder *FuncTemplateBuilder) ImportStruct(structTemplates ...*StructTemplate) *FuncTemplateBuilder {
for _, structTemplate := range structTemplates {
builder.funcTemplate.importedStructTemplates[structTemplate.structName] = structTemplate
}
return builder
}
func (builder *FuncTemplateBuilder) ImportPackage(pkg string) *FuncTemplateBuilder {
builder.funcTemplate.importedPackages[pkg] = true
return builder
}
func (builder *FuncTemplateBuilder) Declare(declaration string) *FuncTemplateBuilder {
builder.funcTemplate.declarations[declaration] = true
return builder
}
func (builder *FuncTemplateBuilder) Source(source string) *FuncTemplate {
builder.funcTemplate.templateSource = source
return builder.funcTemplate
}
type FuncTemplate struct {
*funcSignature
definedInFile string
templateParams map[string]TemplateParam
templateSource string
generators map[string]interface{}
importedFuncTemplates map[string]*FuncTemplate
importedStructTemplates map[string]*StructTemplate
importedPackages map[string]bool
declarations map[string]bool
}
func (funcTemplate *FuncTemplate) ImportFunc(funcTemplates ...*FuncTemplate) {
for _, dep := range funcTemplates {
funcTemplate.importedFuncTemplates[dep.funcName] = dep
}
}
type TemplateParam struct {
Name string
Description string
DefaultValueProvider func(argMap ArgMap) interface{}
}