Marvin Preuss
1d4ae27878
All checks were successful
continuous-integration/drone/push Build is passing
136 lines
3.5 KiB
Go
136 lines
3.5 KiB
Go
// Package godot checks if comments contain a period at the end of the last
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// sentence if needed.
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package godot
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import (
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"fmt"
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"go/ast"
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"go/token"
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"io/ioutil"
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"os"
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"regexp"
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"sort"
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"strings"
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)
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// NOTE: Line and column indexes are 1-based.
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// NOTE: Errors `invalid line number inside comment...` should never happen.
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// Their goal is to prevent panic, if there's a bug with array indexes.
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// Issue contains a description of linting error and a recommended replacement.
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type Issue struct {
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Pos token.Position
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Message string
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Replacement string
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}
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// position is a position inside a comment (might be multiline comment).
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type position struct {
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line int
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column int
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}
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// comment is an internal representation of AST comment entity with additional
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// data attached. The latter is used for creating a full replacement for
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// the line with issues.
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type comment struct {
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lines []string // unmodified lines from file
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text string // concatenated `lines` with special parts excluded
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start token.Position // position of the first symbol in comment
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decl bool // whether comment is a special one (should not be checked)
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}
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// Run runs this linter on the provided code.
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func Run(file *ast.File, fset *token.FileSet, settings Settings) ([]Issue, error) {
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pf, err := newParsedFile(file, fset)
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if err == errEmptyInput || err == errUnsuitableInput {
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return nil, nil
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}
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if err != nil {
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return nil, fmt.Errorf("parse input file: %v", err)
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}
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exclude := make([]*regexp.Regexp, len(settings.Exclude))
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for i := 0; i < len(settings.Exclude); i++ {
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exclude[i], err = regexp.Compile(settings.Exclude[i])
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if err != nil {
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return nil, fmt.Errorf("invalid regexp: %v", err)
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}
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}
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comments := pf.getComments(settings.Scope, exclude)
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issues := checkComments(comments, settings)
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sortIssues(issues)
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return issues, nil
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}
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// Fix fixes all issues and returns new version of file content.
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func Fix(path string, file *ast.File, fset *token.FileSet, settings Settings) ([]byte, error) {
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// Read file
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content, err := ioutil.ReadFile(path) // nolint: gosec
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if err != nil {
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return nil, fmt.Errorf("read file: %v", err)
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}
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if len(content) == 0 {
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return nil, nil
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}
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issues, err := Run(file, fset, settings)
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if err != nil {
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return nil, fmt.Errorf("run linter: %v", err)
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}
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// slice -> map
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m := map[int]Issue{}
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for _, iss := range issues {
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m[iss.Pos.Line] = iss
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}
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// Replace lines from issues
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fixed := make([]byte, 0, len(content))
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for i, line := range strings.Split(string(content), "\n") {
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newline := line
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if iss, ok := m[i+1]; ok {
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newline = iss.Replacement
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}
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fixed = append(fixed, []byte(newline+"\n")...)
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}
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fixed = fixed[:len(fixed)-1] // trim last "\n"
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return fixed, nil
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}
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// Replace rewrites original file with it's fixed version.
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func Replace(path string, file *ast.File, fset *token.FileSet, settings Settings) error {
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info, err := os.Stat(path)
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if err != nil {
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return fmt.Errorf("check file: %v", err)
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}
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mode := info.Mode()
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fixed, err := Fix(path, file, fset, settings)
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if err != nil {
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return fmt.Errorf("fix issues: %v", err)
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}
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if err := ioutil.WriteFile(path, fixed, mode); err != nil {
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return fmt.Errorf("write file: %v", err)
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}
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return nil
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}
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// sortIssues sorts by filename, line and column.
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func sortIssues(iss []Issue) {
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sort.Slice(iss, func(i, j int) bool {
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if iss[i].Pos.Filename != iss[j].Pos.Filename {
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return iss[i].Pos.Filename < iss[j].Pos.Filename
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}
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if iss[i].Pos.Line != iss[j].Pos.Line {
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return iss[i].Pos.Line < iss[j].Pos.Line
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}
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return iss[i].Pos.Column < iss[j].Pos.Column
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})
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}
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