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
|
package rule
import (
"go/ast"
"github.com/mgechev/revive/lint"
)
// ContextAsArgumentRule lints given else constructs.
type ContextAsArgumentRule struct{}
// Apply applies the rule to given file.
func (r *ContextAsArgumentRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
var failures []lint.Failure
fileAst := file.AST
walker := lintContextArguments{
file: file,
fileAst: fileAst,
onFailure: func(failure lint.Failure) {
failures = append(failures, failure)
},
}
ast.Walk(walker, fileAst)
return failures
}
// Name returns the rule name.
func (r *ContextAsArgumentRule) Name() string {
return "context-as-argument"
}
type lintContextArguments struct {
file *lint.File
fileAst *ast.File
onFailure func(lint.Failure)
}
func (w lintContextArguments) Visit(n ast.Node) ast.Visitor {
fn, ok := n.(*ast.FuncDecl)
if !ok || len(fn.Type.Params.List) <= 1 {
return w
}
// A context.Context should be the first parameter of a function.
// Flag any that show up after the first.
for _, arg := range fn.Type.Params.List[1:] {
if isPkgDot(arg.Type, "context", "Context") {
w.onFailure(lint.Failure{
Node: fn,
Category: "arg-order",
Failure: "context.Context should be the first parameter of a function",
Confidence: 0.9,
})
break // only flag one
}
}
return w
}
|
