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
|
// Copyright 2023 The CUE Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// cue-ast-print parses a CUE file and prints its syntax tree, for example:
//
// cue-ast-print file.cue
package main
import (
"flag"
"fmt"
"io"
"log"
"os"
"slices"
"cuelang.org/go/cue/ast"
"cuelang.org/go/cue/ast/astutil"
"cuelang.org/go/cue/errors"
"cuelang.org/go/cue/format"
"cuelang.org/go/cue/load"
"cuelang.org/go/cue/parser"
"cuelang.org/go/internal/astinternal"
)
func main() {
flag.Usage = func() {
fmt.Fprint(flag.CommandLine.Output(), `
usage of cue-ast:
cue-ast print [flags] [inputs]
Write multi-line Go-like representations of CUE syntax trees.
-omitempty omit empty and invalid values
cue-ast join [flags] [inputs]
Join the input package instance as a single file.
Joining multiple package instances is not supported yet.
See 'cue help inputs' as well.
`[1:])
}
if len(os.Args) < 2 {
flag.Usage()
os.Exit(1)
}
lcfg := &load.Config{
// cue-ast only cares about syntax trees; loading the imports just causes
// extra work and may lead to errors we don't care about.
SkipImports: true,
}
name, args := os.Args[1], os.Args[2:]
switch name {
case "print":
var cfg astinternal.DebugConfig
flag.BoolVar(&cfg.OmitEmpty, "omitempty", false, "")
flag.BoolVar(&cfg.IncludeNodeRefs, "refs", false, "")
fileFlag := false
flag.BoolVar(&fileFlag, "files", false, "")
// Note that DebugConfig also has a Filter func, but that doesn't lend itself well
// to a command line flag. Perhaps we could provide some commonly used filters,
// such as "positions only" or "skip positions".
flag.CommandLine.Parse(args)
if fileFlag {
for _, f := range flag.Args() {
var data []byte
var err error
if f == "-" {
data, err = io.ReadAll(os.Stdin)
} else {
data, err = os.ReadFile(f)
}
if err != nil {
log.Fatal(err)
}
astf, err := parser.ParseFile(f, data, parser.ParseComments)
if err != nil {
log.Fatal(errors.Details(err, nil))
}
out := astinternal.AppendDebug(nil, astf, cfg)
os.Stdout.Write(out)
}
return
}
// TODO: should we produce output in txtar form for the sake of
// more clearly separating the AST for each file?
// [ast.File.Filename] already has the full filename,
// but as one of the first fields it's not a great separator.
insts := load.Instances(flag.Args(), lcfg)
for _, inst := range insts {
if err := inst.Err; err != nil {
log.Fatal(errors.Details(err, nil))
}
for _, file := range inst.Files {
out := astinternal.AppendDebug(nil, file, cfg)
os.Stdout.Write(out)
}
}
case "join":
// TODO: add a flag drop comments, which is useful when reducing bug reproducers.
flag.CommandLine.Parse(args)
var jointImports []*ast.ImportSpec
var jointFields []ast.Decl
insts := load.Instances(flag.Args(), lcfg)
if len(insts) != 1 {
log.Fatal("joining multiple instances is not possible yet")
}
inst := insts[0]
if err := inst.Err; err != nil {
log.Fatal(errors.Details(err, nil))
}
for _, file := range inst.Files {
jointImports = slices.Concat(jointImports, file.Imports)
fields := file.Decls[len(file.Preamble()):]
jointFields = slices.Concat(jointFields, fields)
}
// TODO: we should sort and deduplicate imports.
joint := &ast.File{Decls: slices.Concat([]ast.Decl{
&ast.ImportDecl{Specs: jointImports},
}, jointFields)}
// Sanitize the resulting file so that, for example,
// multiple packages imported as the same name avoid collisions.
if err := astutil.Sanitize(joint); err != nil {
log.Fatal(err)
}
out, err := format.Node(joint)
if err != nil {
log.Fatal(err)
}
os.Stdout.Write(out)
default:
flag.Usage()
}
}
|
