mirror of
https://github.com/go-gitea/gitea.git
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279 lines
7.3 KiB
Go
279 lines
7.3 KiB
Go
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package lint
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import (
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"bytes"
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"go/ast"
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"go/parser"
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"go/printer"
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"go/token"
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"go/types"
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"math"
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"regexp"
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"strings"
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)
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// File abstraction used for representing files.
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type File struct {
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Name string
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Pkg *Package
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content []byte
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AST *ast.File
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}
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// IsTest returns if the file contains tests.
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func (f *File) IsTest() bool { return strings.HasSuffix(f.Name, "_test.go") }
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// Content returns the file's content.
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func (f *File) Content() []byte {
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return f.content
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}
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// NewFile creates a new file
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func NewFile(name string, content []byte, pkg *Package) (*File, error) {
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f, err := parser.ParseFile(pkg.fset, name, content, parser.ParseComments)
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if err != nil {
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return nil, err
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}
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return &File{
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Name: name,
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content: content,
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Pkg: pkg,
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AST: f,
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}, nil
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}
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// ToPosition returns line and column for given position.
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func (f *File) ToPosition(pos token.Pos) token.Position {
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return f.Pkg.fset.Position(pos)
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}
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// Render renters a node.
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func (f *File) Render(x interface{}) string {
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var buf bytes.Buffer
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if err := printer.Fprint(&buf, f.Pkg.fset, x); err != nil {
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panic(err)
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}
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return buf.String()
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}
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// CommentMap builds a comment map for the file.
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func (f *File) CommentMap() ast.CommentMap {
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return ast.NewCommentMap(f.Pkg.fset, f.AST, f.AST.Comments)
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}
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var basicTypeKinds = map[types.BasicKind]string{
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types.UntypedBool: "bool",
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types.UntypedInt: "int",
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types.UntypedRune: "rune",
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types.UntypedFloat: "float64",
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types.UntypedComplex: "complex128",
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types.UntypedString: "string",
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}
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// IsUntypedConst reports whether expr is an untyped constant,
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// and indicates what its default type is.
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// scope may be nil.
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func (f *File) IsUntypedConst(expr ast.Expr) (defType string, ok bool) {
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// Re-evaluate expr outside of its context to see if it's untyped.
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// (An expr evaluated within, for example, an assignment context will get the type of the LHS.)
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exprStr := f.Render(expr)
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tv, err := types.Eval(f.Pkg.fset, f.Pkg.TypesPkg, expr.Pos(), exprStr)
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if err != nil {
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return "", false
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}
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if b, ok := tv.Type.(*types.Basic); ok {
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if dt, ok := basicTypeKinds[b.Kind()]; ok {
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return dt, true
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}
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}
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return "", false
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}
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func (f *File) isMain() bool {
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if f.AST.Name.Name == "main" {
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return true
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}
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return false
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}
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const directiveSpecifyDisableReason = "specify-disable-reason"
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func (f *File) lint(rules []Rule, config Config, failures chan Failure) {
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rulesConfig := config.Rules
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_, mustSpecifyDisableReason := config.Directives[directiveSpecifyDisableReason]
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disabledIntervals := f.disabledIntervals(rules, mustSpecifyDisableReason, failures)
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for _, currentRule := range rules {
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ruleConfig := rulesConfig[currentRule.Name()]
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currentFailures := currentRule.Apply(f, ruleConfig.Arguments)
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for idx, failure := range currentFailures {
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if failure.RuleName == "" {
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failure.RuleName = currentRule.Name()
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}
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if failure.Node != nil {
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failure.Position = ToFailurePosition(failure.Node.Pos(), failure.Node.End(), f)
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}
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currentFailures[idx] = failure
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}
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currentFailures = f.filterFailures(currentFailures, disabledIntervals)
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for _, failure := range currentFailures {
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if failure.Confidence >= config.Confidence {
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failures <- failure
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}
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}
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}
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}
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type enableDisableConfig struct {
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enabled bool
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position int
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}
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const directiveRE = `^//[\s]*revive:(enable|disable)(?:-(line|next-line))?(?::([^\s]+))?[\s]*(?: (.+))?$`
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const directivePos = 1
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const modifierPos = 2
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const rulesPos = 3
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const reasonPos = 4
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var re = regexp.MustCompile(directiveRE)
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func (f *File) disabledIntervals(rules []Rule, mustSpecifyDisableReason bool, failures chan Failure) disabledIntervalsMap {
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enabledDisabledRulesMap := make(map[string][]enableDisableConfig)
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getEnabledDisabledIntervals := func() disabledIntervalsMap {
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result := make(disabledIntervalsMap)
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for ruleName, disabledArr := range enabledDisabledRulesMap {
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ruleResult := []DisabledInterval{}
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for i := 0; i < len(disabledArr); i++ {
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interval := DisabledInterval{
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RuleName: ruleName,
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From: token.Position{
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Filename: f.Name,
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Line: disabledArr[i].position,
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},
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To: token.Position{
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Filename: f.Name,
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Line: math.MaxInt32,
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},
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}
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if i%2 == 0 {
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ruleResult = append(ruleResult, interval)
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} else {
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ruleResult[len(ruleResult)-1].To.Line = disabledArr[i].position
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}
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}
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result[ruleName] = ruleResult
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}
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return result
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}
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handleConfig := func(isEnabled bool, line int, name string) {
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existing, ok := enabledDisabledRulesMap[name]
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if !ok {
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existing = []enableDisableConfig{}
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enabledDisabledRulesMap[name] = existing
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}
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if (len(existing) > 1 && existing[len(existing)-1].enabled == isEnabled) ||
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(len(existing) == 0 && isEnabled) {
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return
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}
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existing = append(existing, enableDisableConfig{
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enabled: isEnabled,
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position: line,
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})
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enabledDisabledRulesMap[name] = existing
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}
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handleRules := func(filename, modifier string, isEnabled bool, line int, ruleNames []string) []DisabledInterval {
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var result []DisabledInterval
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for _, name := range ruleNames {
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if modifier == "line" {
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handleConfig(isEnabled, line, name)
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handleConfig(!isEnabled, line, name)
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} else if modifier == "next-line" {
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handleConfig(isEnabled, line+1, name)
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handleConfig(!isEnabled, line+1, name)
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} else {
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handleConfig(isEnabled, line, name)
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}
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}
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return result
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}
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handleComment := func(filename string, c *ast.CommentGroup, line int) {
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comments := c.List
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for _, c := range comments {
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match := re.FindStringSubmatch(c.Text)
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if len(match) == 0 {
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return
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}
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ruleNames := []string{}
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tempNames := strings.Split(match[rulesPos], ",")
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for _, name := range tempNames {
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name = strings.Trim(name, "\n")
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if len(name) > 0 {
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ruleNames = append(ruleNames, name)
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}
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}
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mustCheckDisablingReason := mustSpecifyDisableReason && match[directivePos] == "disable"
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if mustCheckDisablingReason && strings.Trim(match[reasonPos], " ") == "" {
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failures <- Failure{
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Confidence: 1,
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RuleName: directiveSpecifyDisableReason,
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Failure: "reason of lint disabling not found",
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Position: ToFailurePosition(c.Pos(), c.End(), f),
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Node: c,
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}
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continue // skip this linter disabling directive
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}
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// TODO: optimize
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if len(ruleNames) == 0 {
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for _, rule := range rules {
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ruleNames = append(ruleNames, rule.Name())
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}
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}
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handleRules(filename, match[modifierPos], match[directivePos] == "enable", line, ruleNames)
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}
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}
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comments := f.AST.Comments
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for _, c := range comments {
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handleComment(f.Name, c, f.ToPosition(c.End()).Line)
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}
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return getEnabledDisabledIntervals()
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}
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func (f *File) filterFailures(failures []Failure, disabledIntervals disabledIntervalsMap) []Failure {
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result := []Failure{}
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for _, failure := range failures {
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fStart := failure.Position.Start.Line
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fEnd := failure.Position.End.Line
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intervals, ok := disabledIntervals[failure.RuleName]
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if !ok {
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result = append(result, failure)
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} else {
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include := true
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for _, interval := range intervals {
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intStart := interval.From.Line
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intEnd := interval.To.Line
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if (fStart >= intStart && fStart <= intEnd) ||
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(fEnd >= intStart && fEnd <= intEnd) {
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include = false
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break
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}
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}
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if include {
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result = append(result, failure)
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}
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}
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}
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return result
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}
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