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
|
package rule
import (
"fmt"
"go/ast"
"github.com/mgechev/revive/lint"
)
// FunctionResultsLimitRule lints given else constructs.
type FunctionResultsLimitRule struct{}
// Apply applies the rule to given file.
func (r *FunctionResultsLimitRule) Apply(file *lint.File, arguments lint.Arguments) []lint.Failure {
if len(arguments) != 1 {
panic(`invalid configuration for "function-result-limit"`)
}
max, ok := arguments[0].(int64) // Alt. non panicking version
if !ok {
panic(fmt.Sprintf(`invalid value passed as return results number to the "function-result-limit" rule; need int64 but got %T`, arguments[0]))
}
if max < 0 {
panic(`the value passed as return results number to the "function-result-limit" rule cannot be negative`)
}
var failures []lint.Failure
walker := lintFunctionResultsNum{
max: int(max),
onFailure: func(failure lint.Failure) {
failures = append(failures, failure)
},
}
ast.Walk(walker, file.AST)
return failures
}
// Name returns the rule name.
func (r *FunctionResultsLimitRule) Name() string {
return "function-result-limit"
}
type lintFunctionResultsNum struct {
max int
onFailure func(lint.Failure)
}
func (w lintFunctionResultsNum) Visit(n ast.Node) ast.Visitor {
node, ok := n.(*ast.FuncDecl)
if ok {
num := 0
if node.Type.Results != nil {
num = node.Type.Results.NumFields()
}
if num > w.max {
w.onFailure(lint.Failure{
Confidence: 1,
Failure: fmt.Sprintf("maximum number of return results per function exceeded; max %d but got %d", w.max, num),
Node: node.Type,
})
return w
}
}
return w
}
|
