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struct.go
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struct.go
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// InfoMark - a platform for managing courses with
// distributing exercise sheets and testing exercise submissions
// Copyright (C) 2019 ComputerGraphics Tuebingen
// 2020-present InfoMark.org
// Authors: Patrick Wieschollek
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package swagger
import (
"errors"
"fmt"
"go/ast"
"go/token"
"strings"
"github.com/davecgh/go-spew/spew"
)
// Struct is a representation of Go structs.
type Struct struct {
Name string
Description string
Fields []*Field
Comments *ast.CommentGroup
Tag *Tag
Position token.Position
}
// Field is a representation of fields in Go structs.
type Field struct {
Tag *Tag
Type ast.Expr
Childs []*Struct
Depth int
}
// IdentString will preprend some white-space before the string.
func IdentString(str string, ch int) string {
preSpace := strings.Repeat(" ", ch)
lines := strings.Split(str, "\n")
for k := range lines {
lines[k] = preSpace + lines[k]
}
return strings.Join(lines, "\n")
}
// ParseField will parse a field from a GO struct.
func ParseField(fset *token.FileSet, n ast.Node, field *ast.Field, depth int) (*Field, error) {
result := &Field{}
result.Type = field.Type
result.Depth = depth
t, err := parseTag(string(field.Tag.Value))
if err == nil {
if t.Name == "-" {
return nil, errors.New("Skip -")
}
result.Tag = t
} else {
return nil, err
}
if len(field.Names) > 0 {
switch x := field.Type.(type) {
case *ast.StructType:
child, err := ParseStruct(fset, n, x, field.Names[0].Name, depth+1)
if err == nil {
result.Childs = append(result.Childs, child)
}
case *ast.StarExpr:
switch y := x.X.(type) {
case *ast.StructType:
child, err := ParseStruct(fset, n, y, field.Names[0].Name, depth+1)
if err == nil {
result.Childs = append(result.Childs, child)
}
}
}
}
return result, nil
}
// ParseStruct will parse a struct in a GO implementation.
func ParseStruct(fset *token.FileSet, n ast.Node, structDecl *ast.StructType, name string, depth int) (*Struct, error) {
fields := structDecl.Fields.List
result := &Struct{Name: name}
result.Position = fset.Position(n.Pos())
for _, field := range fields {
if field.Tag != nil {
t, err := parseTag(string(field.Tag.Value))
if err == nil {
result.Tag = t
} else {
spew.Dump(structDecl)
fmt.Println(string(field.Tag.Value))
panic(err)
}
f, err := ParseField(fset, n, field, depth)
if err == nil {
result.Fields = append(result.Fields, f)
}
}
}
return result, nil
}