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queryset.go
126 lines (103 loc) · 3.09 KB
/
queryset.go
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package generator
import (
"bytes"
"fmt"
"go/ast"
"go/types"
"io"
"sort"
"strings"
"github.com/shivang-saxena/go-gen-gorm/internal/parser"
"github.com/shivang-saxena/go-gen-gorm/internal/queryset/field"
"github.com/shivang-saxena/go-gen-gorm/internal/queryset/methods"
)
type querySetStructConfig struct {
StructName string
Name string
Methods methodsSlice
Fields []field.Info
}
type methodsSlice []methods.Method
func (s methodsSlice) Len() int { return len(s) }
func (s methodsSlice) Less(i, j int) bool {
// first, group by receiver
receiverCmp := strings.Compare(s[i].GetReceiverDeclaration(), s[j].GetReceiverDeclaration())
if receiverCmp != 0 {
return receiverCmp < 0
}
// second, sort by method name inside a receiver group
return strings.Compare(s[i].GetMethodName(), s[j].GetMethodName()) < 0
}
func (s methodsSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
type querySetStructConfigSlice []querySetStructConfig
func (s querySetStructConfigSlice) Len() int { return len(s) }
func (s querySetStructConfigSlice) Less(i, j int) bool {
return strings.Compare(s[i].Name, s[j].Name) < 0
}
func (s querySetStructConfigSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func doesNeedToGenerateQuerySet(doc *ast.CommentGroup) bool {
if doc == nil {
return false
}
for _, c := range doc.List {
parts := strings.Split(strings.TrimSpace(c.Text), ":")
ok := len(parts) == 2 &&
strings.TrimSpace(strings.TrimPrefix(parts[0], "//")) == "gen" &&
strings.TrimSpace(parts[1]) == "qs"
if ok {
return true
}
}
return false
}
func genStructFieldInfos(s parser.ParsedStruct, types *types.Package) (ret []field.Info) {
g := field.NewInfoGenerator(types)
for _, f := range s.Fields {
fi := g.GenFieldInfo(f)
if fi == nil {
continue
}
ret = append(ret, *fi)
}
return ret
}
func generateQuerySetConfigs(types *types.Package,
structs map[string]parser.ParsedStruct) querySetStructConfigSlice {
querySetStructConfigs := querySetStructConfigSlice{}
for _, s := range structs {
if !doesNeedToGenerateQuerySet(s.Doc) {
continue
}
fields := genStructFieldInfos(s, types)
b := newMethodsBuilder(s, fields)
methods := b.Build()
qsConfig := querySetStructConfig{
StructName: s.TypeName,
Name: s.TypeName + "QuerySet",
Methods: methods,
Fields: fields,
}
sort.Sort(qsConfig.Methods) // make output queryset stable
querySetStructConfigs = append(querySetStructConfigs, qsConfig)
}
return querySetStructConfigs
}
// GenerateQuerySetsForStructs is an internal method to retrieve querysets
// generated code from parsed structs
func GenerateQuerySetsForStructs(types *types.Package, structs map[string]parser.ParsedStruct) (io.Reader, error) {
querySetStructConfigs := generateQuerySetConfigs(types, structs)
if len(querySetStructConfigs) == 0 {
return nil, nil
}
sort.Sort(querySetStructConfigs)
var b bytes.Buffer
err := qsTmpl.Execute(&b, struct {
Configs querySetStructConfigSlice
}{
Configs: querySetStructConfigs,
})
if err != nil {
return nil, fmt.Errorf("can't generate structs query sets: %s", err)
}
return &b, nil
}