85 lines
1.8 KiB
Go
85 lines
1.8 KiB
Go
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package rule
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import (
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"bufio"
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"bytes"
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"fmt"
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"go/token"
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"strings"
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"unicode/utf8"
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"github.com/mgechev/revive/lint"
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)
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// LineLengthLimitRule lints given else constructs.
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type LineLengthLimitRule struct{}
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// Apply applies the rule to given file.
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func (r *LineLengthLimitRule) Apply(file *lint.File, arguments lint.Arguments) []lint.Failure {
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if len(arguments) != 1 {
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panic(`invalid configuration for "line-length-limit"`)
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}
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max, ok := arguments[0].(int64) // Alt. non panicking version
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if !ok || max < 0 {
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panic(`invalid value passed as argument number to the "line-length-limit" rule`)
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}
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var failures []lint.Failure
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checker := lintLineLengthNum{
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max: int(max),
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file: file,
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onFailure: func(failure lint.Failure) {
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failures = append(failures, failure)
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},
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}
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checker.check()
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return failures
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}
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// Name returns the rule name.
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func (r *LineLengthLimitRule) Name() string {
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return "line-length-limit"
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}
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type lintLineLengthNum struct {
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max int
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file *lint.File
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onFailure func(lint.Failure)
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}
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func (r lintLineLengthNum) check() {
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f := bytes.NewReader(r.file.Content())
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spaces := strings.Repeat(" ", 4) // tab width = 4
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l := 1
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s := bufio.NewScanner(f)
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for s.Scan() {
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t := s.Text()
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t = strings.Replace(t, "\t", spaces, -1)
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c := utf8.RuneCountInString(t)
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if c > r.max {
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r.onFailure(lint.Failure{
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Category: "code-style",
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Position: lint.FailurePosition{
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// Offset not set; it is non-trivial, and doesn't appear to be needed.
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Start: token.Position{
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Filename: r.file.Name,
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Line: l,
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Column: 0,
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},
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End: token.Position{
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Filename: r.file.Name,
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Line: l,
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Column: c,
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},
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},
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Confidence: 1,
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Failure: fmt.Sprintf("line is %d characters, out of limit %d", c, r.max),
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})
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}
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l++
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}
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}
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