func parseToFile()

in modfile/rule.go [239:297]
53 lines of code
12 McCabe index (conditional complexity)

func parseToFile(file string, data []byte, fix VersionFixer, strict bool) (parsed *File, err error) {
	fs, err := parse(file, data)
	if err != nil {
		return nil, err
	}
	f := &File{
		Syntax: fs,
	}
	var errs ErrorList

	// fix versions in retract directives after the file is parsed.
	// We need the module path to fix versions, and it might be at the end.
	defer func() {
		oldLen := len(errs)
		f.fixRetract(fix, &errs)
		if len(errs) > oldLen {
			parsed, err = nil, errs
		}
	}()

	for _, x := range fs.Stmt {
		switch x := x.(type) {
		case *Line:
			f.add(&errs, nil, x, x.Token[0], x.Token[1:], fix, strict)

		case *LineBlock:
			if len(x.Token) > 1 {
				if strict {
					errs = append(errs, Error{
						Filename: file,
						Pos:      x.Start,
						Err:      fmt.Errorf("unknown block type: %s", strings.Join(x.Token, " ")),
					})
				}
				continue
			}
			switch x.Token[0] {
			default:
				if strict {
					errs = append(errs, Error{
						Filename: file,
						Pos:      x.Start,
						Err:      fmt.Errorf("unknown block type: %s", strings.Join(x.Token, " ")),
					})
				}
				continue
			case "module", "require", "exclude", "replace", "retract":
				for _, l := range x.Line {
					f.add(&errs, x, l, x.Token[0], l.Token, fix, strict)
				}
			}
		}
	}

	if len(errs) > 0 {
		return nil, errs
	}
	return f, nil
}