/
generator.go
137 lines (110 loc) · 3.34 KB
/
generator.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
package generator
import (
"fmt"
"github.com/LeMikaelF/proxy-generator/generator/internal/flags"
"github.com/LeMikaelF/proxy-generator/generator/internal/method"
"github.com/LeMikaelF/proxy-generator/generator/internal/source"
"github.com/LeMikaelF/proxy-generator/generator/internal/tmpl"
"go/ast"
"go/parser"
"go/token"
"os"
"path/filepath"
)
type fileHandler interface {
getwd() (string, error)
readFile(filename string) ([]byte, error) // Add ReadFile
writeFile(filename string, data []byte, perm os.FileMode) error
glob(pattern string) ([]string, error)
}
type OsFileHandler struct{}
func (fh *OsFileHandler) getwd() (string, error) {
return os.Getwd()
}
func (fh *OsFileHandler) readFile(filename string) ([]byte, error) {
return os.ReadFile(filename)
}
func (fh *OsFileHandler) writeFile(filename string, data []byte, perm os.FileMode) error {
return os.WriteFile(filename, data, perm)
}
func (fh *OsFileHandler) glob(pattern string) ([]string, error) {
return filepath.Glob(pattern)
}
type Generator struct {
workingDir string
pkg string
typeName string
passthroughMethods map[string]bool
fileHandler fileHandler
}
func New() (*Generator, error) {
parsedFlags, err := flags.Parse()
if err != nil {
return nil, err
}
return new(&OsFileHandler{}, parsedFlags)
}
func new(fh fileHandler, parsedFlags *flags.ParsedFlags) (*Generator, error) {
workingDir, err := fh.getwd()
if err != nil {
return nil, fmt.Errorf("error getting current working directory: %v", err)
}
g := &Generator{
workingDir: workingDir,
fileHandler: fh,
}
g.pkg = parsedFlags.PackageName
g.typeName = parsedFlags.TypeName
g.passthroughMethods = parsedFlags.PassthroughMethods
return g, nil
}
func (g *Generator) Run() error {
files, err := g.fileHandler.glob(g.workingDir + "/*.go")
if err != nil {
return fmt.Errorf("error finding go files: %v", err)
}
fset := token.NewFileSet()
var structDecl *ast.GenDecl
var methods []method.Method
var packageName string
imports := make(map[string]struct{})
for _, file := range files {
fileData, err := g.fileHandler.readFile(file) // Read the file contents from the file handler
if err != nil {
return fmt.Errorf("error reading file %s: %v", file, err)
}
fileNode, err := parser.ParseFile(fset, file, fileData, parser.AllErrors)
sourceFile := source.NewFile(fileNode)
if fileNode.Name.Name != g.pkg {
continue
}
if structDecl == nil {
structDecl = sourceFile.FindStructDeclaration(g.typeName)
packageName = fileNode.Name.Name
}
newMethods, newImports := sourceFile.FindMethods(g.typeName, g.passthroughMethods)
methods = append(methods, newMethods...)
for _, newImport := range newImports {
imports[newImport] = struct{}{}
}
}
if structDecl == nil {
return fmt.Errorf("could not find struct declaration with name %s", g.typeName)
}
template := tmpl.New(packageName, g.typeName, methods, toSlice(imports))
generatedCode, err := template.Render()
if err != nil {
return err
}
generatedFileName := fmt.Sprintf("%s_proxy_gen.go", g.typeName)
if err := g.fileHandler.writeFile(generatedFileName, []byte(generatedCode), 0666); err != nil {
return fmt.Errorf("error outputting code: %v", err)
}
return nil
}
func toSlice(m map[string]struct{}) (slice []string) {
for k := range m {
slice = append(slice, k)
}
return slice
}