This repository has been archived by the owner on Feb 25, 2023. It is now read-only.
/
rewrite.go
176 lines (143 loc) · 3.64 KB
/
rewrite.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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
package rewriter
import (
"io"
"os"
"path/filepath"
"strings"
macro "github.com/tdakkota/gomacro"
"github.com/tdakkota/gomacro/internal/loader"
"github.com/tdakkota/gomacro/pragma"
)
// ReWriter is a Go source rewriter.
type ReWriter struct {
source, output string
macros macro.Macros
printer Printer
loaded loader.Loaded
}
// NewReWriter creates new ReWriter.
func NewReWriter(source, output string, macros macro.Macros, printer Printer) ReWriter {
return ReWriter{
source: source,
output: output,
macros: macros,
printer: printer,
}
}
// Source returns source path.
func (r ReWriter) Source() string {
return r.source
}
// Output returns output path.
func (r ReWriter) Output() string {
return r.output
}
// Rewrite rewrites given source and output using macro list.
func (r ReWriter) Rewrite() error {
fi, err := os.Stat(r.source)
if err != nil {
return err
}
switch mode := fi.Mode(); {
case mode.IsDir():
return r.rewriteDir()
case mode.IsRegular():
return r.rewriteFile()
}
return nil
}
// RewriteTo rewrites one package using macros to given writer.
func (r ReWriter) RewriteTo(w io.Writer) error {
ctx, err := loader.LoadOne(r.source)
if err != nil {
return err
}
return r.runMacro(w, ctx)
}
// RewriteReader loads sources from given reader and writes output to given writer.
func (r ReWriter) RewriteReader(name string, src io.Reader, w io.Writer) error {
ctx, err := loader.LoadReader(src, name)
if err != nil {
return err
}
return r.runMacro(w, ctx)
}
func (r ReWriter) rewriteDir() error {
return loader.LoadWalk(r.source, func(l loader.Loaded, ctx macro.Context) error {
r.loaded = l
file := ctx.FileSet.File(ctx.File.Pos()).Name()
// skip generated files
if strings.HasSuffix(file, ".gen.go") {
return nil
}
outputFile, err := r.prepareOutputFile(file)
if err != nil {
return err
}
return r.rewriteOneFile(outputFile, ctx)
})
}
func (r ReWriter) prepareOutputFile(file string) (string, error) {
return prepareGenFile(file)
}
func (r ReWriter) rewriteFile() error {
ctx, err := loader.LoadOne(r.source)
if err != nil {
return err
}
return r.rewriteOneFile(r.output, ctx)
}
func (r ReWriter) rewriteOneFile(output string, ctx macro.Context) error {
err := os.MkdirAll(filepath.Dir(output), os.ModePerm)
if err != nil {
return err
}
var w io.Writer = os.Stdout
if output != "" {
w, err = os.Create(output)
if err != nil {
return err
}
}
return r.runMacro(w, ctx)
}
func (r ReWriter) runMacro(w io.Writer, context macro.Context) error {
macroRunner := NewRunner(context.FileSet)
globalPragmas := pragma.ParsePragmas(context.File.Doc)
globalMacros := r.macros.Get(globalPragmas.Use()...)
rewrites := len(globalMacros)
copyDecl := copyDecls(context.File.Decls)
context.File = copyFile(context.File)
for _, decl := range copyDecl {
pragmas := pragma.ParsePragmas(loader.LoadComments(decl))
localMacros := r.macros.Get(pragmas.Use()...)
rewrites += len(localMacros)
for _, handler := range localMacros {
context.Pragmas = pragmas
macroRunner.Run(handler, context, decl)
if macroRunner.failed {
return errFailed
}
}
for name, handler := range globalMacros {
if _, ok := localMacros[name]; ok {
continue
}
context.Pragmas = pragmas
macroRunner.Run(handler, context, decl)
if macroRunner.failed {
return errFailed
}
}
}
if len(context.File.Imports) > 0 {
err := r.fixImports(true, context)
if err != nil {
return err
}
}
if _, err := io.WriteString(w, "// Code generated by gomacro; DO NOT EDIT.\n"); err != nil {
return err
}
return r.printer.PrintFile(w, context.FileSet, context.File)
}